-- 作者：longshentailang
-- 发布时间：5/13/2007 1:35:00 PM
-- 多线程设计[转帖]
一般情况下多线程编程多采用MFC类库实现，那么如果不使用MFC 如何进行多线程
程序设计呢？本文将就这个问题进行讨论：
微软在Windows API中提供了建立新的线程的函数CreateThread，它的语法如
下：
hThread = CreateThread (&security_attributes, dwStackSize,
ThreadProc,pParam, dwFlags, &idThread) ;
第一个参数是指向SECURITY_ATTRIBUTES型态的结构的指针。在Windows 98中
忽略该参数。在Windows NT中，它被设为NULL。第二个参数是用于新线程的初始
堆栈大小，默认值为0。在任何情况下，Windows根据需要动态延长堆栈的大小。
CreateThread的第三个参数是指向线程函数的指标。函数名称没有限制，但
是必须以下列形式声明：
DWORD WINAPI ThreadProc (PVOID pParam) ;
CreateThread的第四个参数为传递给ThreadProc的参数。这样主线程和从属
线程就可以共享数据。
CreateThread的第五个参数通常为0，但当建立的线程不马上执行时为旗标
CREATE_SUSPENDED。线程将暂停直到呼叫ResumeThread来恢复线程的执行为止。
第六个参数是一个指标，指向接受执行绪ID值的变量。
大多数Windows程序写作者喜欢用在PROCESS.H表头文件中声明的C执行时期链
接库函数_beginthread。它的语法如下：
hThread = _beginthread (ThreadProc, uiStackSize, pParam) ;
它更简单，对于大多数应用程序很完美，这个线程函数的语法为：
void __cdecl ThreadProc (void * pParam) ;
在建立多线程的Windows程序时，需要在「Project Settings」对话框中做一
些修改。选择「C/C++」页面标签，然后在「Category」下拉式清单方块中选择「
Code Generation」。在「Use Run-Time Library」下拉式清单方块中，可以看到
用于「Release」设定的「Single-Threaded」和用于Debug设定的「Debug
Single-Threaded」。将这些分别改为「Multithreaded」和「Debug
Multithreaded」。这将把编译器旗标改为/MT，它是编译器在编译多线程的应用
程序所需要的。 第一个demo.
/*******************************************************
*
* deom1---四个线程同时写一个文件( 没有参数 )
*
*
***********************************************************/
#include <windows.h>
#include <process.h> /* _beginthread, _endthread */
#include <iostream>
#include <fstream>
using namespace std;
ofstream out("out.txt");
void ThreadFunc1(PVOID param)
{
while(1)
{
Sleep(10);
out<<"This was draw by thread l"<<endl;
}
}
void ThreadFunc2(PVOID param)
{
while(1)
{
Sleep(10);
out<<"This was draw by thread 2"<<endl;
}
}
void ThreadFunc3(PVOID param)
{
while(1)
{
Sleep(10);
out<<"This was draw by thread 3"<<endl;
}
}
void ThreadFunc4(PVOID param)
{
while(1)
{
Sleep(10);
out<<"This was draw by thread 4"<<endl;
}
}
int main()
{
int i=0;
_beginthread(ThreadFunc1,0,NULL);
_beginthread(ThreadFunc2,0,NULL);
_beginthread(ThreadFunc3,0,NULL);
_beginthread(ThreadFunc4,0,NULL);
Sleep(3000);
out<<"end";
return 0;
}
//demo1 end-----------------------------------------------
第二个demo.
/*******************************************************
*
* deom2---四个线程同时写一个文件( 有参数 )
*
*
***********************************************************/
#include <windows.h>
#include <process.h> /* _beginthread, _endthread */
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
ofstream out("out.txt");
void ThreadFunc1(PVOID param)
{
while(1)
{
char *p;
p=(char *) param;
Sleep(10);
out<<p<<"This was draw by thread l"<<endl;
}
}
void ThreadFunc2(PVOID param)
{
while(1)
{
Sleep(10);
out<<"This was draw by thread 2"<<endl;
}
}
void ThreadFunc3(PVOID param)
{
while(1)
{
Sleep(10);
out<<"This was draw by thread 3"<<endl;
}
}
void ThreadFunc4(PVOID param)
{
while(1)
{
Sleep(10);
out<<"This was draw by thread 4"<<endl;
}
}
int main()
{
char *pstr=" 参数传递成功";
_beginthread(ThreadFunc1,0,pstr);
_beginthread(ThreadFunc2,0,NULL);
_beginthread(ThreadFunc3,0,NULL);
_beginthread(ThreadFunc4,0,NULL);
Sleep(1000);
out<<"end";
return 0;
}
// demo2 end ------------------------------------------------
第三个demo( 一个win32 应用程序 )
/*******************************************************
*
* deom3--- 在屏幕上随机画出一系列矩形
*
*
***********************************************************/ #include <windows.h>
#include <process.h>
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
HWND hwnd ;
int cxClient, cyClient ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("RndRctMT") ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows
NT!"),szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow ( szAppName, TEXT ("Random Rectangles"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
VOID Thread (PVOID pvoid)
{
HBRUSH hBrush ;
HDC hdc ;
int xLeft, xRight, yTop, yBottom, iRed, iGreen, iBlue ;
while (TRUE)
{
if (cxClient != 0 || cyClient != 0)
{
xLeft = rand () % cxClient ;
xRight = rand () % cxClient ;
yTop = rand () % cyClient ;
yBottom = rand () % cyClient ;
iRed = rand () & 255 ;
iGreen = rand () & 255 ;
iBlue = rand () & 255 ;
hdc = GetDC (hwnd) ;
hBrush = CreateSolidBrush (RGB (iRed, iGreen, iBlue)) ;
SelectObject (hdc, hBrush) ;
Rectangle (hdc,min (xLeft, xRight), min (yTop, yBottom),
max (xLeft, xRight), max (yTop, yBottom)) ;
ReleaseDC (hwnd, hdc) ;
DeleteObject (hBrush) ;
}
}
}
LRESULT CALLBACK WndProc ( HWND hwnd, UINT message, WPARAM wParam,
LPARAM lParam)
{
switch (message)
{
case WM_CREATE:
_beginthread (Thread, 0, NULL) ;
return 0 ;
case WM_SIZE:
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;
return 0 ;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
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