获取鼠标坐标GetCursorPos

下面这个例子是获取屏幕的坐标：

#include<windows.h> 
#include<windowsx.h>
LRESULT CALLBACK WindowProc(  
  HWND hwnd,      // handle to window   
  UINT uMsg,      // message identifier   
  WPARAM wParam,  // first message parameter   
  LPARAM lParam   // second message parameter   
);  
int WINAPI WinMain(  
  HINSTANCE hInstance,      // handle to current instance   
  HINSTANCE hPrevInstance,  // handle to previous instance   
  LPSTR lpCmdLine,          // command line   
  int nCmdShow              // show state   
  )  
{  
    static TCHAR szAppName[]=TEXT("AppName");  
    HWND hwnd;  
    MSG msg;  
    WNDCLASS wndclass;  
    wndclass.cbClsExtra=0;  
    wndclass.cbWndExtra=0;  
    wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);  
    wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);  
    wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);  
    wndclass.hInstance=hInstance;  
    wndclass.lpfnWndProc=WindowProc;  
    wndclass.lpszClassName=szAppName;  
    wndclass.lpszMenuName=NULL;  
    wndclass.style=CS_HREDRAW|CS_VREDRAW;  
  
    if(!RegisterClass(&wndclass)){  
        MessageBox(NULL,TEXT("This program requires Windows NT"),szAppName,MB_ICONERROR);  
    }  
  
    hwnd=CreateWindow(  
  szAppName,  // registered class name   
  TEXT("This is title"), // window name   
  WS_OVERLAPPEDWINDOW,        // window style   
  CW_USEDEFAULT,                // horizontal position of window   
  CW_USEDEFAULT,                // vertical position of window   
  CW_USEDEFAULT,           // window width   
  CW_USEDEFAULT,          // window height   
  NULL,      // handle to parent or owner window   
  NULL,          // menu handle or child identifier   
  hInstance,  // handle to application instance   
  NULL        // window-creation data   
);  
    ShowWindow(hwnd,nCmdShow);  
    UpdateWindow(hwnd);  
  
    while(GetMessage(&msg,NULL,0,0)){  
        TranslateMessage(&msg);  
        DispatchMessage(&msg);  
    }  
    return msg.wParam;  
}  
LRESULT CALLBACK WindowProc(  
  HWND hwnd,      // handle to window   
  UINT uMsg,      // message identifier   
  WPARAM wParam,  // first message parameter   
  LPARAM lParam   // second message parameter   
)  
{  
    HDC hdc;  
    PAINTSTRUCT ps;  
    TCHAR szBuffer[30];  
	POINT point;
	RECT rect;
	static RECT rr;
	static int cxClient;
	static int cyClient;

    switch(uMsg){  

		case WM_SIZE:
			cxClient=GET_X_LPARAM(lParam);
			cyClient=GET_Y_LPARAM(lParam);
			GetClientRect(hwnd,&rr);
			//wsprintf(szBuffer,TEXT("cyClient %d"),cyClient);
			//MessageBox(NULL,szBuffer,TEXT("tip"),MB_ICONERROR);
			
			return 0;

        case WM_PAINT:  
			hdc=BeginPaint(hwnd,&ps);
			
           GetCursorPos(&point);
		  TextOut(hdc,200,200,szBuffer,wsprintf(szBuffer,TEXT("the point is %d,%d"),point.x,point.y));
			EndPaint(hwnd,&ps);
            return 0;

        case WM_DESTROY:  
            PostQuitMessage(0);  
            return 0; 
			
		case WM_MOUSEMOVE:
			//SendMessage(hwnd,WM_PAINT,0,0);
			rect.left=rr.left;
			rect.top=rr.top;
			rect.right=rr.right;
			rect.bottom=rr.bottom;
			
			InvalidateRect(hwnd,&rect,TRUE);
			return 0;
  
    }  
    return DefWindowProc(hwnd,uMsg,wParam,lParam);  
} 

可以把屏幕坐标转化为客户区坐标：

#include<windows.h> 
#include<windowsx.h>
LRESULT CALLBACK WindowProc(  
  HWND hwnd,      // handle to window   
  UINT uMsg,      // message identifier   
  WPARAM wParam,  // first message parameter   
  LPARAM lParam   // second message parameter   
);  
int WINAPI WinMain(  
  HINSTANCE hInstance,      // handle to current instance   
  HINSTANCE hPrevInstance,  // handle to previous instance   
  LPSTR lpCmdLine,          // command line   
  int nCmdShow              // show state   
  )  
{  
    static TCHAR szAppName[]=TEXT("AppName");  
    HWND hwnd;  
    MSG msg;  
    WNDCLASS wndclass;  
    wndclass.cbClsExtra=0;  
    wndclass.cbWndExtra=0;  
    wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);  
    wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);  
    wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);  
    wndclass.hInstance=hInstance;  
    wndclass.lpfnWndProc=WindowProc;  
    wndclass.lpszClassName=szAppName;  
    wndclass.lpszMenuName=NULL;  
    wndclass.style=CS_HREDRAW|CS_VREDRAW;  
  
    if(!RegisterClass(&wndclass)){  
        MessageBox(NULL,TEXT("This program requires Windows NT"),szAppName,MB_ICONERROR);  
    }  
  
    hwnd=CreateWindow(  
  szAppName,  // registered class name   
  TEXT("This is title"), // window name   
  WS_OVERLAPPEDWINDOW,        // window style   
  CW_USEDEFAULT,                // horizontal position of window   
  CW_USEDEFAULT,                // vertical position of window   
  CW_USEDEFAULT,           // window width   
  CW_USEDEFAULT,          // window height   
  NULL,      // handle to parent or owner window   
  NULL,          // menu handle or child identifier   
  hInstance,  // handle to application instance   
  NULL        // window-creation data   
);  
    ShowWindow(hwnd,nCmdShow);  
    UpdateWindow(hwnd);  
  
    while(GetMessage(&msg,NULL,0,0)){  
        TranslateMessage(&msg);  
        DispatchMessage(&msg);  
    }  
    return msg.wParam;  
}  
LRESULT CALLBACK WindowProc(  
  HWND hwnd,      // handle to window   
  UINT uMsg,      // message identifier   
  WPARAM wParam,  // first message parameter   
  LPARAM lParam   // second message parameter   
)  
{  
    HDC hdc;  
    PAINTSTRUCT ps;  
    TCHAR szBuffer[30];  
	POINT point;
	RECT rect;
	static RECT rr;
	static int cxClient;
	static int cyClient;

    switch(uMsg){  

	case WM_SIZE:
		cxClient=GET_X_LPARAM(lParam);
		cyClient=GET_Y_LPARAM(lParam);
		GetClientRect(hwnd,&rr);
		//wsprintf(szBuffer,TEXT("cyClient %d"),cyClient);
		//MessageBox(NULL,szBuffer,TEXT("tip"),MB_ICONERROR);
			
		return 0;

        case WM_PAINT:  
	          hdc=BeginPaint(hwnd,&ps);
			
                   GetCursorPos(&point);
	          ScreenToClient(hwnd,&point);//将屏幕坐标转化为客户坐标
                   TextOut(hdc,200,200,szBuffer,wsprintf(szBuffer,TEXT("the point is %d,%d"),point.x,point.y));
	          EndPaint(hwnd,&ps);
                   return 0;

        case WM_DESTROY:  
            PostQuitMessage(0);  
            return 0; 
			
	case WM_MOUSEMOVE:
	          //SendMessage(hwnd,WM_PAINT,0,0);
		rect.left=rr.left;
		rect.top=rr.top;
		rect.right=rr.right;
		rect.bottom=rr.bottom;
			
		InvalidateRect(hwnd,&rect,TRUE);
		return 0;
  
    }  
    return DefWindowProc(hwnd,uMsg,wParam,lParam);  
}