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2013年7月18日 星期四

Data Synchronization Update

標題：同步變更數據
Node.JS (getdata.js)：
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var server,
ip = "127.0.0.1",
port = 1337,
http = require("http"),
url = require("url"),
fs = require("fs"),
qs = require("querystring");
var textPath = "p.txt";
server = http.createServer(function (req, res) {
var polling = {
timeover : false,
timeout : null,
request : function(q) {
this.timeout = setTimeout(function() {
polling.timeover = true;
}, 10000);
this.action(q);
},
action : function(q) {
if(this.timeover == true) { //確認連線逾時
q.callback({});
} else {
fs.readFile(textPath, "utf-8", function(err, file) {
if(q.json.lastTime < qs.parse(file).lastTime) { //有新資料
q.callback(qs.parse(file));
} else { //駐列輪巡
setTimeout(function() { polling.action(q) }, 100);
}
});
}
}
};
switch(url.parse(req.url).pathname) {
case "/jquery":
fs.readFile("js/jquery-1.9.1.js", function (err, data) {
if(err) throw err;
res.writeHead(200, {"Content-Type": "text/javascript", "Content-Length":data.length});
res.write(data);
res.end();
});
break;
case "/index":
fs.readFile("index.html", function (err, data) {
if(err) throw err;
res.writeHead(200, {"Content-Type": "text/html", "Content-Length":data.length});
res.write(data);
res.end();
});
break;
case "/sendData":
var sendData = "";
var lastTime = new Date().getTime();
req.setEncoding("utf8");
req.addListener("data", function(sendDataChunk) {
sendData += sendDataChunk;
});
req.addListener("end", function() {
sendData += "&lastTime=" + lastTime;
fs.open(textPath, "w", 0644, function(err, fd) {
if(err) throw err;
fs.write(fd, sendData, 0, "utf8", function(err) {
if(err) throw err;
fs.closeSync(fd);
var json = JSON.stringify({lastTime: lastTime});
res.writeHead(200, {
"Content-Type": "text/json",
"Content-Length": json.length
});
console.log(json);
res.end(json);
})
});
});
break;
case "/getData":
var getData = "";
req.setEncoding("utf8");
req.addListener("data", function(getDataChunk) {
getData += getDataChunk;
});
req.addListener("end", function() {
polling.request({
json : qs.parse(getData),
callback : function(data) {
var json = JSON.stringify(data);
res.writeHead(200, {
"Content-Type": "text/json",
"Content-Length": json.length
});
res.end(json);
}
});
});
break;
default:
res.writeHead(200, {"Content-Type": "text/html"});
res.write("Page not found.");
res.end();
break;
}
});
server.listen(port);
console.log("Server running at http://" + ip + ":" + port);
HTML (index.html)：
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="zh-TW" xml:lang="zh-TW">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Title</title>
<script src="/jquery"></script>
<script type="text/javascript">
$(function() {
var localurl = window.location.protocol + "//" + window.location.host;
var lastTime = 0;
$("#sendBtn").click(function() {
var username = $("#username").val();
var xValue = $("#xValue").val();
var yValue = $("#yValue").val();
var zValue = $("#zValue").val();
$.post("/sendData", {user: username, x: xValue, y: yValue, z: zValue},
function(data) {
console.log("Message Send on " + data.lastTime);
}, "json");
});
var pollingData = function() {
$.ajax({
cache: false,
dataType: "json",
type: "POST",
url: localurl + "/getData",
data: {lastTime: lastTime},
error: function (xhr, status, error) {
document.write("Error");
},
success: function (json) {
//console.log(json);
if(!$.isEmptyObject(json)) { //判斷內容是否為空
console.log("Update...");
//lastTime = new Date().getTime();
$("#username").val(json.user);
$("#xValue").val(json.x);
$("#yValue").val(json.y);
$("#zValue").val(json.z);
lastTime = json.lastTime;
pollingData();
} else { //繼續輪巡
console.log("Pulling...");
pollingData();
}
}
});
};
pollingData();
});
</script>
</head>
<body>
name: <input type="text" id="username" value="QQBoxy" /><br />
x: <input type="text" id="xValue" value="3" /><br />
y: <input type="text" id="yValue" value="4" /><br />
z: <input type="text" id="zValue" value="5" /><br />
<button id="sendBtn">Send</button>
</body>
</html>
Batch (Start.bat)：

說明：
使用Node.JS與jQuery進行數據同步變更。
Posted by QQBoxy 0 comment
Tag - , ,

Read STL Model file and export graphics using GD Library

標題：讀取STL模型檔案並使用GD Library匯出圖形
VC++ (main.cpp)：
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#include "stdafx.h"
#include <iostream>
#include <regex>
#include <fstream>
#include "gd/gd.h"
#include "gd/gdfontg.h"
#include "gd/gdfontt.h"
#include "gd/gdfonts.h"
#include "gd/gdfontmb.h"
#include "gd/gdfontl.h"
#pragma comment(lib, "lib/bgd.lib")
using namespace std;
class pos
{
public:
float x;
float y;
float z;
};
class ERR
{
private:
int kind;
public:
ERR(int k) : kind(k){}; //建構函式
char* message()
{
switch(kind)
{
case 0:
return "Parameter Error!";
case 1:
return "Path Error!";
case 2:
return "File Error!";
case 3:
return "Array Size is too small.";
case 4:
return "STL Format Error!";
}
}
};
void draw(gdImagePtr im, pos vArr[], int v, int color)
{
int i = 0;
for(i=0;i<v;i+=3)
{
gdImageLine(im, (int)vArr[i].x, (int)vArr[i].y, (int)vArr[i+1].x, (int)vArr[i+1].y, color);
gdImageLine(im, (int)vArr[i+1].x, (int)vArr[i+1].y, (int)vArr[i+2].x, (int)vArr[i+2].y, color);
gdImageLine(im, (int)vArr[i].x, (int)vArr[i].y, (int)vArr[i+2].x, (int)vArr[i+2].y, color);
}
}
int main(int argc, char* argv[])
{
const float zoom = 5;
const int arrSize = 3000;
const int width = 500;
const int height = 500;
int i = 0, normals = 0, vertexs = 0;
char pathChar[1024];
char stlName[1024];
string lines = "";
pos *normalArr;
pos *vertexArr;
regex pathRegex("([a-zA-Z]\:\\\\(?:[^\\\\]+\\\\)*)(.*)"); //"C:\\temp\\hello.txt"
regex solid(" *solid.*");
regex facetNormal(" *facet normal ([+-]?(?=\.[0-9]|[0-9])(?:[0-9]+)?(?:\.?[0-9]*)(?:[eE][+-]?[0-9]+)?) ([+-]?(?=\.[0-9]|[0-9])(?:[0-9]+)?(?:\.?[0-9]*)(?:[eE][+-]?[0-9]+)?) ([+-]?(?=\.[0-9]|[0-9])(?:[0-9]+)?(?:\.?[0-9]*)(?:[eE][+-]?[0-9]+)?)");
regex outerLoop(" *outer loop");
regex vertex(" *vertex ([+-]?(?=\.[0-9]|[0-9])(?:[0-9]+)?(?:\.?[0-9]*)(?:[eE][+-]?[0-9]+)?) ([+-]?(?=\.[0-9]|[0-9])(?:[0-9]+)?(?:\.?[0-9]*)(?:[eE][+-]?[0-9]+)?) ([+-]?(?=\.[0-9]|[0-9])(?:[0-9]+)?(?:\.?[0-9]*)(?:[eE][+-]?[0-9]+)?)");
regex endLoop(" *endloop");
regex endfacet(" *endfacet");
regex endsolid(" *endsolid");
cmatch pathMatch;
smatch normalMatch;
smatch vertexMatch;
try
{
if(argc<2) throw ERR(1); //Check Parameter
strcpy(pathChar, argv[1]); //Get STL Path
if(!regex_match(pathChar, pathMatch, pathRegex)) throw ERR(1); //Check STL Path
strcpy(stlName, pathMatch[2].str().c_str()); //Get STL Name
ifstream File(pathChar);
if (!File.is_open()) throw ERR(2); //Check File
normalArr = new pos[arrSize]; //宣告Facet normal動態陣列大小
vertexArr = new pos[arrSize*3]; //宣告Vertex動態陣列大小
cout << "Reading Now..." << endl;
//solid
if(!File.good()) throw ERR(4);
getline(File, lines);
if(!regex_match(lines, solid)) throw ERR(4);
while(File.good())
{
if(normals >= arrSize) throw ERR(3); //Check Array Size
//facet normal
getline(File, lines);
if(regex_match(lines, normalMatch, facetNormal))
{
normalArr[normals].x = atof(normalMatch[1].str().c_str()) + width/2;
normalArr[normals].y = atof(normalMatch[2].str().c_str()) + height/2;
normalArr[normals].z = atof(normalMatch[3].str().c_str());
normals++;
}
else if(regex_match(lines, endsolid)) //end solid
{
break;
}
else
{
throw ERR(4);
}
//outer loop
getline(File, lines);
if(!regex_match(lines, outerLoop)) throw ERR(4);
//vertex
for(i=0;i<3;i++)
{
getline(File, lines);
if(regex_match(lines, vertexMatch, vertex))
{
vertexArr[vertexs].x = atof(vertexMatch[1].str().c_str())*zoom + width/2;
vertexArr[vertexs].y = atof(vertexMatch[2].str().c_str())*zoom + height/2;
vertexArr[vertexs].z = atof(vertexMatch[3].str().c_str())*zoom;
vertexs++;
}
else
{
throw ERR(4);
}
}
//end loop
getline(File, lines);
if(!regex_match(lines, endLoop)) throw ERR(4);
//end facet
getline(File, lines);
if(!regex_match(lines, endfacet)) throw ERR(4);
}
File.close();
cout << "Facet Normal: " << normals << endl;
cout << "Vertex: " << vertexs << endl;
cout << "Done." << endl;
// --- draw ---
cout << "Drawing Now..." << endl;
FILE *out;
int size;
char *data;
gdImagePtr im = gdImageCreate(width, height);
int white = gdImageColorAllocate(im, 255, 255, 255), //Background
black = gdImageColorAllocate(im, 0, 0, 0),
blue = gdImageColorAllocate(im, 0, 0, 255),
cyan = gdImageColorAllocate(im, 0, 255, 255),
green = gdImageColorAllocate(im, 128, 255, 0),
red = gdImageColorAllocate(im, 255, 0, 0),
purple = gdImageColorAllocate(im, 255, 0, 255),
orange = gdImageColorAllocate(im, 255, 128, 0),
yellow = gdImageColorAllocate(im, 255, 255, 0);
strcpy(pathChar, argv[0]); //Get Execution Path
if(!regex_match(pathChar, pathMatch, pathRegex)) throw ERR(1); //Check Execution Path
strcpy(pathChar, pathMatch[1].str().c_str()); //Get Folder Path
strcat(pathChar, stlName); //Connections Folder Path and STL Name
strcat(pathChar, ".png"); //Connections Path and Extension
out = fopen(pathChar, "wb");
if (!out) throw ERR(1);
draw(im, vertexArr, vertexs, black);
data = (char *) gdImagePngPtr(im, &size);
if (!data) throw ERR(2);
if (fwrite(data, 1, size, out) != size) throw ERR(3);
if (fclose(out) != 0) throw ERR(4);
gdFree(data);
cout << "Done." << endl;
}
catch(ERR e)
{
cout << e.message() << endl;
}
system("pause");
return 0;
}

說明：
首先拖曳一個STL模型檔案至執行檔以進行讀取，一邊進行檔案比對一邊將點資料存入類別陣列內，再使用GD Library匯出png圖片檔。
Posted by QQBoxy 0 comment
Tag - , , , , ,

Solving Matrix Inverse using Pointer

標題：使用指標求解n維矩陣
VC++ (main.cpp)：
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#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <string>
#include <regex>
#include <iomanip>
using namespace std;
void print(double *Arr, int m)
{
int i = 0, j = 0;
for(i=0;i<m;i++)
{
for(j=0;j<m;j++)
{
cout << *(Arr+i*m+j) << setprecision(2) << "\t";
}
cout << endl;
}
}
void printInverse(double *Matrix, double *Inverse, int m)
{
int i = 0, j = 0;
for(i=0;i<m;i++)
{
for(j=0;j<m;j++)
{
cout << *(Matrix+i*m+j) << setprecision(2) << "\t";
}
cout << "|\t";
for(j=0;j<m;j++)
{
cout << *(Inverse+i*m+j) << setprecision(2) << "\t";
}
cout << endl;
}
}
void readfile(string filePath, double *Matrix)
{
int m = 0, n = 0, i = 0;
string lines = "";
string::const_iterator start;
match_results<string::const_iterator> matchMatrix; //迭代器
regex regMatrix("([0-9]+)+");
ifstream outputFile(filePath);
if (outputFile.is_open()) //Check File
{
while(outputFile.good())
{
getline(outputFile, lines);
start = lines.begin();
while (regex_search(start, lines.cend(), matchMatrix, regMatrix))
{
*(Matrix+i) = atof(matchMatrix[1].str().c_str());
i++;
start = matchMatrix[0].second;
}
m++;
}
outputFile.close();
}
}
double plusnum(double num)
{
if(num < 0) return -1 * num;
return num;
}
void rowSwap(double *Matrix, int ma, int mb, int m)
{
int i = 0;
double *Temp = new double[m];
for(i=0;i<m;i++)
{
*(Temp+i) = *(Matrix+ma*m+i);
*(Matrix+ma*m+i) = *(Matrix+mb*m+i);
*(Matrix+mb*m+i) = *(Temp+i);
}
}
void inverse(double *Matrix, double *Inverse, int m)
{
int i = 0, j = 0, k = 0;
double temp = 0;
//*(Matrix + rows * m + columns) 看成 Matrix[rows][columns]
for(int i=0; i<m; i++)
{
for(int j=i+1; j<m; j++)
{
if(plusnum(*(Matrix + j * m + i)) > plusnum(*(Matrix + i * m + i)))
{
rowSwap(Matrix, i, j, m); // 互換Matrix矩陣兩行
rowSwap(Inverse, i, j, m); // 互換Inverse矩陣兩行
//cout << "[" << i << "][" << j << "]Swap:" << endl;
//printInverse(Matrix, Inverse, m);
}
}
// 消去
for(int j=0; j<m; j++) //第 i 次消去運算，以第 i 行作為主要行，將其上下各行的第 i 列元素化為零
{
if(j != i)
{
// 進行消去運算，將第 i 列上下方的元素化為零
double temp = *(Matrix + j * m + i) / *(Matrix + i * m + i);
// 注意此處 k 可從 i+1 開始
//for(int k=i+1; k<m; k++)
for(int k=0; k<m; k++)
{
*(Matrix + j * m + k) -= (*(Matrix + i * m + k) * temp);
}
// 注意此處 k 要從 0 開始
for(int k=0; k<m; k++)
{
*(Inverse + j * m + k) -= (*(Inverse + i * m + k) * temp);
}
//cout << "[" << i << "][" << j << "]Matrix:" << endl;
//printInverse(Matrix, Inverse, m);
}
}
}
// Matrix 已經是對角矩陣，只要在將其對角線元素化為 1 即可
// 此時僅需對 Inverse 矩陣作運算
//cout << "[" << i << "][" << j << "]Inverse:" << endl;
//printInverse(Matrix, Inverse, m);
for(int i=0; i<m; i++)
{
for(int j=0; j<m; j++)
{
*(Inverse + i * m + j) /= *(Matrix + i * m + i);
}
//cout << "[" << i << "][" << j << "]Inverse:" << endl;
//printInverse(Matrix, Inverse, m);
}
}
int main(int argc, char *argv[])
{
const int m = 4;
int i = 0, j = 0;
double Matrix[m][m] = {};
double Inverse[m][m] = {};
for(i=0;i<m;i++)
{
for(j=0;j<m;j++)
{
if(i == j)
Inverse[i][j] = 1;
else
Inverse[i][j] = 0;
}
}
readfile("matrix.txt", &Matrix[0][0]);
cout << "Matrix:" << endl;
print(&Matrix[0][0], m);
inverse(&Matrix[0][0], &Inverse[0][0], m);
cout << endl;
cout << "Inverse:" << endl;
print(&Inverse[0][0], m);
system("pause");
return 0;
}
TEXT (matrix.txt)：

說明：
先讀取矩陣數據再利用指標的方式求得n維度反矩陣的解。
Posted by QQBoxy 0 comment
Tag - , , , ,

2013年7月16日 星期二

Check the ASCII format of STL file

標題：檢查ASCII STL格式範例
VC++ (main.cpp)：
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#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <regex> //string lib here
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
int i = 0, num = 1;
const char *filePath = "TriangleASCII.STL";
string lines = "";
regex solid(" *solid.*");
regex facetNormal(" *facet normal .+ .+ .+");
regex outerLoop(" *outer loop");
regex vertex(" *vertex .+ .+ .+");
regex endLoop(" *endloop");
regex endfacet(" *endfacet");
regex endsolid(" *endsolid");
//regex number("[+-]?(?=\.[0-9]|[0-9])(?:[0-9]+)?(?:\.?[0-9]*)(?:[eE][+-]?[0-9]+)?");
ifstream outputFile(filePath);
if (outputFile.is_open()) //Check File
{
num++;
//solid
if(outputFile.good())
{
getline(outputFile, lines);
if(regex_match(lines, solid))
{
cout << lines << endl;
while(outputFile.good())
{
//facet normal
getline(outputFile, lines);
if(regex_match(lines, facetNormal))
{
cout << lines << endl;
num++;
} else if(regex_match(lines, endsolid)) { //end solid
cout << lines << endl;
cout << "Done." << endl;
break;
} else {
cout << "[line " << num << " format error] " << lines << endl;
break;
}
//outer loop
getline(outputFile, lines);
if(regex_match(lines, outerLoop))
{
cout << lines << endl;
num++;
} else {
cout << "[line " << num << " format error] " << lines << endl;
break;
}
//vertex
getline(outputFile, lines);
if(regex_match(lines, vertex))
{
cout << lines << endl;
num++;
} else {
cout << "[line " << num << " format error] " << lines << endl;
break;
}
getline(outputFile, lines);
if(regex_match(lines, vertex))
{
cout << lines << endl;
num++;
} else {
cout << "[line " << num << " format error] " << lines << endl;
break;
}
getline(outputFile, lines);
if(regex_match(lines, vertex))
{
cout << lines << endl;
num++;
} else {
cout << "[line " << num << " format error] " << lines << endl;
break;
}
//end loop
getline(outputFile, lines);
if(regex_match(lines, endLoop))
{
cout << lines << endl;
num++;
} else {
cout << "[line " << num << " format error] " << lines << endl;
break;
}
//end facet
getline(outputFile, lines);
if(regex_match(lines, endfacet))
{
cout << lines << endl;
num++;
} else {
cout << "[line " << num << " format error] " << lines << endl;
break;
}
}
} else {
cout << "[line " << num << " format error] " << lines << endl;
}
}
outputFile.close();
}
return 0;
}
說明：
使用Regular Expression檢查ASCII STL檔案格式。
Posted by QQBoxy 0 comment
Tag - , , ,

Simple drawing using the GD Libary

標題：GD繪圖範例
VC++ (main.cpp)：
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#include "stdafx.h"
#include <iostream>
#include "gd/gd.h"
#include "gd/gdfontg.h"
#include "gd/gdfontt.h"
#include "gd/gdfonts.h"
#include "gd/gdfontmb.h"
#include "gd/gdfontl.h"
#include <math.h>
using namespace std;
#pragma comment(lib, "lib/bgd.lib")
#define DEG 3.14159/180.
class ERR
{
private:
int kind;
public:
ERR(int k) : kind(k){};
char* message()
{
switch(kind)
{
case 0:
return "File Error!";
case 1:
return "GD Error!";
case 2:
return "File Write Error!";
case 3:
return "File Close Error!";
}
}
};
void drawstar(gdImagePtr image, float origx, float origy, float r, float angle, int color)
{
int i = 0;
float ptx[6],pty[6],pttx[6],ptty[6];
float temp1,temp2,temp3,temp4;
for(i=0;i<6;i++)
{
ptx[i]=origx+r*sin(72.*i*DEG+angle*DEG);
pty[i]=origy+r*cos(72.*i*DEG+angle*DEG);
temp1=cos(54.*DEG-72.*DEG*i-angle*DEG);
temp2=sin(54.*DEG-72.*DEG*i-angle*DEG);
temp3=sin(18.*DEG);
temp4=cos(36.*DEG);
pttx[i]=origx+r*temp3*temp1/temp4;
ptty[i]=origy+r*temp3*temp2/temp4;
}
for(i=0;i<5;i++)
{
gdImageLine(image, (int)ptx[i], (int)pty[i], (int)pttx[i], (int)ptty[i], color);
gdImageLine(image, (int)pttx[i], (int)ptty[i], (int)ptx[i+1], (int)pty[i+1], color);
}
}
int main(int argc, _TCHAR* argv[])
{
int i = 0;
FILE *out;
int size;
char *data;
gdImagePtr im = gdImageCreate(500, 500);
int white = gdImageColorAllocate(im, 255, 255, 255), //Background
black = gdImageColorAllocate(im, 0, 0, 0),
blue = gdImageColorAllocate(im, 0, 0, 255),
cyan = gdImageColorAllocate(im, 0, 255, 255),
green = gdImageColorAllocate(im, 128, 255, 0),
red = gdImageColorAllocate(im, 255, 0, 0),
purple = gdImageColorAllocate(im, 255, 0, 255),
orange = gdImageColorAllocate(im, 255, 128, 0),
yellow = gdImageColorAllocate(im, 255, 255, 0);
out = fopen("image.png", "wb");
try
{
if (out) {
for(i=0;i<72;i++)
{
drawstar(im, 250+5*i*sin(i*10*DEG), 250+5*i*cos(i*10*DEG), 30, 180, black);
}
data = (char *) gdImagePngPtr(im, &size);
if (!data) {
throw ERR(1);
}
if (fwrite(data, 1, size, out) != size) {
throw ERR(2);
}
if (fclose(out) != 0) {
throw ERR(3);
}
gdFree(data);
}
else
{
throw ERR(0);
}
}
catch(ERR e)
{
cout << e.message() << endl;
}
return 0;
}

說明：
簡單使用GD Library進行繪圖。
Posted by QQBoxy 0 comment
Tag - , , ,

2013年7月15日 星期一

Exception Handling

標題：例外處理的方法
VC++ (main.cpp)：
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#include "stdafx.h"
#include <iostream>
#include <regex>
#include <fstream>
using namespace std;
class pos
{
public:
float x;
float y;
float z;
};
class ERR
{
private:
int kind;
public:
ERR(int k) : kind(k){}; //建構函式
char* message()
{
switch(kind)
{
case 0:
return "Error A";
case 1:
return "Error B";
case 2:
return "Error C";
}
}
};
void readfile(string path)
{
string lines = "";
ifstream File(path);
if (File.is_open()) //Check File
{
while(File.good())
{
getline(File, lines);
cout << lines << endl;
}
File.close();
}
}
int main(int argc, char *argv[])
{
switch(0) //Select Example
{
case 0:
{
//Example 1
int n = 0;
string str = "Hello";
try
{
cin >> n;
cout << str.at(n) << endl; //取得字串的第n個字元
}
catch (...)
{
cout << "Error!" << endl;
}
break;
}
case 1:
{
//Example 2
float num = 1;
try
{
cout << "num=";
cin >> num;
if(num == 0)
{
throw "Infinity!";
}
cout << "100/num=" << 100/num << endl;
}
catch (const char* message)
{
cout << message << endl;
}
break;
}
case 2:
{
//Example 3
try {
if(argc<2)
{
throw "Parameter error.";
}
char pathChar[1024];
regex pathRegex("([a-zA-Z]\:\\\\(?:[^\\\\]+\\\\)*.*)"); //"C:\\temp\\hello.txt"
cmatch pathMatch; //cmatch: Char Match
strcpy(pathChar, argv[1]); //Pointer to Char
if(regex_match(pathChar, pathMatch, pathRegex)) //char, cmatch, regexp
{
readfile(pathMatch[1].str());
}
else
{
throw "Path Error.";
}
}
catch(const char* message)
{
cout << message << endl;
}
break;
}
case 3:
{
//Example 4
pos p;
p.x = 1.1f;
p.y = 2.2f;
p.z = 3.3f;
cout << "(" << p.x << ", " << p.y << ", " << p.z << ")" << endl;
break;
}
case 4:
{
//Example 5
try
{
throw ERR(0);
}
catch(ERR e)
{
cout << e.message() << endl;
}
break;
}
}
system("pause");
return 0;
}

說明：
一般及搭配argc、argv、Regular Expression、Class例外處理的方法
Posted by QQBoxy 0 comment
Tag - , , , ,

Drag to read the file

標題：拖曳方式讀取檔案
VC++ (main.cpp)：
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#include "stdafx.h"
#include <iostream>
#include <fstream> //ifstream
#include <sstream> //getline
using namespace std;
int main(const int argc, char *argv[])
{
/*int i = 0;
cout << "argc: " << argc << endl;
for(i=0;i<argc;i++)
{
cout << "*argv[" << i << "]: " << argv[i] << endl;
}*/
//Path Convert
char pathChar[1024];
string pathString = "";
strcpy(pathChar, argv[1]); //Pointer to Char
pathString.assign(pathChar); //Char to String
//ReadFile
string lines = "";
ifstream File(pathString);
if (File.is_open()) //Check File
{
while(File.good())
{
getline(File, lines);
cout << lines << endl;
}
File.close();
}
system("pause");
return 0;
}
Batch (Start.bat)：


說明：
將檔案拖曳至exe執行檔，並藉由argc、argv取得路徑，轉換路徑變數型態後進行讀檔動作。
Batch檔是用來測試多行參數的讀取，須放在與執行檔相同之目錄。
Posted by QQBoxy 0 comment
Tag - , , , , , ,

2013年7月10日 星期三

Passing two-dimensional array to a function using pointer #2

標題：使用指標傳值的方式做矩陣相乘運算
VC++ (main.cpp)：
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#include "stdafx.h"
#include <iostream>
using namespace std;
void multiply(float *matrixA, float *matrixB, float *matrixC, int p, int q, int r)
{
int i = 0, j = 0, k = 0;
float sum = 0.0f;
for(i=0;i<p;i++)
{
for(j=0;j<r;j++)
{
sum = 0.0f;
for (k = 0; k < q; k++)
{
sum += *(matrixA + i*q + k) * *(matrixB + k*r + j);
}
*(matrixC + i*r + j) = sum;
}
}
}
int _tmain(int argc, _TCHAR* argv[])
{
const int p = 4, q = 2, r = 3;
int i = 0, j = 0;
float matrixA[p][q] = { //4x2矩陣
{3, -1},
{0, 3},
{1, 4},
{2, 1}
};
float matrixB[q][r] = { //2x3矩陣
{1, -2, 3},
{2, 1, 0}
};
float matrixC[p][r] = {}; //4x3矩陣
multiply(&matrixA[0][0], &matrixB[0][0], &matrixC[0][0], p, q, r);
//印出二維陣列資料
for(i=0;i<p;i++)
{
for(j=0;j<r;j++)
{
cout << matrixC[i][j] << "\t";
}
cout << endl;
}
return 0;
}

說明：
將3個二維陣列初始位址及陣列大小傳入函式，並在函式中針對指標內容進行矩陣相乘運算操作。
Posted by QQBoxy 0 comment
Tag - , , ,

Get value using Regular Expression

標題：C/C++使用正規表示法取值
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#include "stdafx.h"
#include <iostream>
#include <regex> //string lib here
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
cout << "--- Example 1 ---" << endl;
//String Match
string strA = "13393774";
smatch matchA;
regex regA("[0-9]+");
if(regex_match(strA, matchA, regA))
{
cout << atof(matchA[0].str().c_str()) << " is number." << endl;
} else {
cout << "Not a number." << endl;
}
cout << "--- Example 2 ---" << endl;
//String Match
string strB = "-4.472136e-001";
smatch matchB;
regex regB("[+-]?(?=\.[0-9]|[0-9])(?:[0-9]+)?(?:\.?[0-9]*)(?:[eE][+-]?[0-9]+)?");
if(regex_match(strB, matchB, regB))
{
cout << atof(matchB[0].str().c_str()) << " is number." << endl;
} else {
cout << "Not a number." << endl;
}
cout << "\n--- Example 3 ---" << endl;
//String Search
string strC = " facet normal 0.000000e+000 -4.472136e-001 8.944272e-001";
smatch matchC;
regex regC(" *facet normal \
([+-]?(?=\.[0-9]|[0-9])(?:[0-9]+)?(?:\.?[0-9]*)(?:[eE][+-]?[0-9]+)?) \
([+-]?(?=\.[0-9]|[0-9])(?:[0-9]+)?(?:\.?[0-9]*)(?:[eE][+-]?[0-9]+)?) \
([+-]?(?=\.[0-9]|[0-9])(?:[0-9]+)?(?:\.?[0-9]*)(?:[eE][+-]?[0-9]+)?)");
if(regex_match(strC, matchC, regC))
{
cout << "Facet normal: (";
cout << atof(matchC[1].str().c_str()) << ", ";
cout << atof(matchC[2].str().c_str()) << ", ";
cout << atof(matchC[3].str().c_str()) << ")" << endl;
} else {
cout << "Not Match." << endl;
}
return 0;
}

說明：
在C/C++中使用正規表示式取得數值。
Posted by QQBoxy 0 comment
Tag - , , ,

Passing two-dimensional array to a function using pointer

標題：使用指標傳入函式的方式進行多維陣列的處理
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#include "stdafx.h"
#include <iostream>
using namespace std;
// 陣列指標位址, 行數, 列數, 乘值
void multiply(float *matrix, int rows, int columns, float num)
{
int i = 0, j = 0;
for(i=0;i<rows;i++)
{
for(j=0;j<columns;j++)
{
*matrix *= num;
matrix++;
}
}
}
int _tmain(int argc, _TCHAR* argv[])
{
const int m = 3, n = 4;
int i = 0, j = 0;
float matrixA[m][n] = { //3x4矩陣
{1, 2, 3, 4},
{0, 1, 0, 0},
{0, 0, 1, 0}
};
//傳入matrixA的記憶體起始儲存位址以進行處理
multiply(&matrixA[0][0], m, n , 5);
//印出二維陣列資料
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
{
cout << matrixA[i][j] << "\t";
}
cout << endl;
}
return 0;
}

說明：
將陣列初始位址及陣列大小傳入函式，並在函式中針對指標內容進行運算操作。
Posted by QQBoxy 0 comment
Tag - , , ,

Passing array to a function

標題：使用一維陣列傳入函式的方式進行一維陣列的處理
VC++ (main.cpp)：
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#include "stdafx.h"
#include <iostream>
using namespace std;
// 一維陣列, 乘值
float* multiply(float arr[], int m ,float num)
{
int i = 0;
for(i=0;i<m;i++)
{
arr[i] *= num;
}
return arr;
}
int _tmain(int argc, _TCHAR* argv[])
{
const int m = 5;
int i = 0, j = 0;
float arrA[m] = {1, 2, 3, 4, 5};
float *arrB = new float[m]; //宣告一動態陣列
arrB= multiply(arrA, m, 5); //傳入一維陣列
for(i=0;i<m;i++) //印出一維陣列資料
{
cout << arrB[i] << endl;
}
return 0;
}

說明：
直接向函式傳入一維陣列進行處理，再存入另一個陣列輸出。
Posted by QQBoxy 0 comment
Tag - , ,

2013年7月8日 星期一

Using Regular expression in C/C++

標題：C/C++使用正規表示法
VC++ (main.cpp)：
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#include "stdafx.h"
#include <iostream>
#include <regex> //string lib here
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
//String Match
string strA = "1337";
regex regA("[0-9]+");
if(regex_match(strA, regA))
{
cout << "A Match." << endl;
} else {
cout << "A Not Match." << endl;
}
//String Search
string strB = "cad23342";
regex regB("[0-9]");
if(regex_search(strB, regB))
{
cout << "B Match." << endl;
} else {
cout << "B Not Match." << endl;
}
//String Replace
string strC = "Hello I'm QQBoxy!!";
regex regC(" ");
string wordC = "\n";
cout << regex_replace(strC, regC, wordC) << endl;
//String Replace
string strD = "Hello I'm QQBoxy!!";
regex regD("a|e|i|o|u");
string wordD = "[$&]";
cout << regex_replace(strD, regD, wordD) << endl;
return 0;
}
說明：
在C/C++中正規表示式常用的三種語法。
Posted by QQBoxy 0 comment
Tag - , , ,

Two ways to Read and Write Files

標題：C/C++兩種讀取文字檔的方法
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#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <string>
//#include <iomanip>
//setprecision(4) "3.1415"
//setfill('Q') "QQ123"
//setw(5) " 123"
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
int i = 0, j = 0;
const char *filePath = "pi.xls";
remove(filePath); //Delete File
//VC++ -----------------------------------------------------
//Write File
ofstream outputFile(filePath, fstream::app); //fstream::out fstream::app
if (outputFile.is_open()) //Check File
{
for(j=1;j<10;j++)
{
for(i=1;i<10;i++)
{
outputFile << i << "*" << j << "=" << i*j << "\t";
}
outputFile << endl;
}
outputFile.close();
}
//Read File
string lines = "";
ifstream inputFile(filePath);
if (inputFile.is_open()) //Check File
{
while(inputFile.good())
{
getline(inputFile, lines);
cout << lines << endl;
}
inputFile.close();
}
//Standard C -----------------------------------------------------
//Write File
FILE *writeFile = fopen(filePath, "a");
if (writeFile) { //Check File
for(j=1;j<10;j++)
{
for(i=1;i<10;i++)
{
fprintf(writeFile, "%d*%d=%d\t", i, j, i*j);
}
fprintf(writeFile, "\n");
}
fclose(writeFile);
}
//Read File
char line[100] = ""; // Light!!
FILE *readFile = fopen(filePath, "r");
if (readFile) { //Check File
while(fgets(line, sizeof(line), readFile))
{
printf("%s", line);
}
fclose(readFile);
}
return 0;
}
說明：
使用fstream的方法讀寫檔案，以及使用C的fopen讀寫檔案的方法。
Posted by QQBoxy 0 comment
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String conversion

標題：C/C++字串轉換
VC++ (main.cpp)：
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#include "stdafx.h"
#include <iostream>
#include <string>
#include <sstream> //ostringstream
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
//Character Sequences
//char c[13] = "CharVariable";
char c[13] = {'C', 'h', 'a', 'r', 'V', 'a', 'r', 'i', 'a', 'b', 'l', 'e', '\0'};
//Pointer
char *p = "Pointer";
//Class
string s = "String";
//String to Char
strcpy(c, s.c_str());
cout << c << endl;
//Char to String
s.assign(c);
cout << s << endl;
//Pointer to Char
strcpy(c, p);
cout << c << endl;
//Char to Pointer
p = &c[0];
cout << p << endl;
//String to Float
float num1 = 0.0f;
s = "233.42";
num1 = atof(s.c_str());
cout << num1 << endl;
//Float to String
float num2 = 233.42f;
ostringstream buffer;
buffer << num2;
s = buffer.str();
cout << s << endl;
return 0;
}
說明：
字元陣列、指標字串、VC字串，互相轉換。
Posted by QQBoxy 0 comment
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