helloworld.c

C#一个实例源代码

/*-----------------------------------------------------------------------------------------------------------
  HelloWorld.c
------------------------------------------------------------------------------------------------------------*/

#include <windows.h>
#include"resource.h"


LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
DWORD WINAPI Thread1(LPVOID);
HANDLE hHandle;
HANDLE hThread;


int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     static TCHAR szAppName[] = TEXT ("HelloWorld") ;
     HWND         hwnd ;
     MSG          msg ;
     WNDCLASS     wndclass ;
	 HMENU        hMenu;

     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 ;
     }
	 hMenu=LoadMenu(hInstance,szAppName );
     
     hwnd = CreateWindow (
		                   szAppName,                 
                          TEXT ("Hello World!"),  
                          WS_OVERLAPPEDWINDOW
                          |WS_HSCROLL|WS_VSCROLL,
     
                          CW_USEDEFAULT,               
                          CW_USEDEFAULT,             
                          CW_USEDEFAULT,              
                          CW_USEDEFAULT,               
                          NULL,                       
                          hMenu,                       
                          hInstance,                  
                          NULL) ;                     
     
     ShowWindow (hwnd, iCmdShow) ;
     UpdateWindow (hwnd) ;
     
     while (GetMessage (&msg, NULL, 0, 0))
     {
          TranslateMessage (&msg) ;
          DispatchMessage (&msg) ;
     }
     return msg.wParam ;
}
//回调函数1
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
     DWORD ThreadID;
	 DWORD id;
	 HDC hDCT; 
	 STARTUPINFO siex;
	 char szPos[64];
	 int Priority;
	 
     switch (message)
     {            
     case WM_DESTROY:
          PostQuitMessage (0) ;
          return 0 ;
	 case WM_LBUTTONDOWN:
		     //创建线程并运行
             //hHandle=OpenProcess(PROCESS_TERMINATE,FALSE,GetCurrentProcessId());
		     hHandle=OpenProcess(PROCESS_QUERY_INFORMATION,FALSE,GetCurrentProcessId());
			 SetPriorityClass(hHandle,IDLE_PRIORITY_CLASS); 
			 siex.cb=sizeof(siex);
			 siex.lpReserved=NULL;
			 siex.cbReserved2=0;
			 siex.lpReserved2=NULL;

			 GetStartupInfo(&siex);
			 sprintf(szPos,"Left=%d,Top=%d,\nRight=%d,Bottom=%d,Title=%s",siex.dwX,siex.dwY,siex.dwX+siex.dwXSize,siex.dwY+siex.dwYSize,siex.lpTitle);
			 MessageBox(NULL,szPos,"Window position and title",MB_OK);
			 Sleep(1000);
			 //TerminateProcess(hHandle,0);
			 ExitProcess(0);
			 return 0;
			 break;
	 case WM_RBUTTONDOWN:
		     //创建线程并运行
             hDCT=GetDC(hwnd);
			 hThread=CreateThread(NULL,0,Thread1,hDCT,NULL,&ThreadID);
			 Priority=GetThreadPriority(GetCurrentThread());
			 //线程的默认优先级是THREAD_PRIORITY_NORMAL
			 if(Priority==THREAD_PRIORITY_NORMAL)
			 {
				 MessageBox(NULL,"Normal priority!","Priority",MB_OK);
			 }
			 else
			 {
				 MessageBox(NULL,TEXT(Priority),"priority",MB_OK);
			 }
			 SetThreadPriority(GetCurrentThread(),THREAD_PRIORITY_TIME_CRITICAL);
			 Priority=GetThreadPriority(GetCurrentThread());
			 //线程的默认优先级是THREAD_PRIORITY_NORMAL
			 if(Priority==THREAD_PRIORITY_NORMAL)
			 {
				 MessageBox(NULL,"Normal priority!","Priority",MB_OK);
			 }
			 else
			 {
				 MessageBoxA(NULL,"It is not Normal priority!","priority",MB_OK);
			 }
			 return 0;
			 break;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}

DWORD WINAPI Thread1(LPVOID param)
{
	 int i;
     HDC hDC;
     TCHAR szBuffer[16] ;
	 hDC=(HDC)param;

	 
	 for(i=0;i<1e100;i++)
	 {
	      //sleep(200);
		  TextOut (hDC, 400, 400, szBuffer, 
                   wsprintf (szBuffer, TEXT ("%d"), i++)) ;
          if (i>100000)
		  {
			  //当满足一个条件是可以调用ExitThread(dwExitCode)退出当前线程.
			  // dwExitCode为退出后的返回代码
			  ExitThread(0);
		  }
	 }
	 MessageBox (NULL, TEXT ("Thread1 processed!"), 
                      "tips", MB_ICONINFORMATION) ;
	 return 1;

}