caretdemo.c

C#一个实例源代码

/*----------------------------------------
CaretDemo.c
----------------------------------------*/
#include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

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

     wndclass.style         = CS_HREDRAW | CS_VREDRAW|CS_DBLCLKS;
     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  = szAppName;
     wndclass.lpszClassName = szAppName ;

     if (!RegisterClass (&wndclass))
     {
          MessageBox (NULL, TEXT ("This program requires Windows NT!"), 
                      szAppName, MB_ICONERROR) ;
          return 0 ;
     }
     
     hwnd = CreateWindow (szAppName,                
                          szAppName, 
                          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 ;
}



LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{   

 
   switch (message)
   { 
     case WM_SETFOCUS: 
 
    // Create a solid black caret. 
        CreateCaret(hwnd, (HBITMAP) NULL, 5, 30); 
 
    // Adjust the caret position, in client coordinates. 
        SetCaretPos(0, 0); 
 
    // Display the caret. 
        ShowCaret(hwnd); 
 
        return 0;
  
	case WM_DESTROY:
        PostQuitMessage (0) ;
        return 0 ;
   }
   return DefWindowProc (hwnd, message, wParam, lParam) ;
}