更新时间:2016-01-12 21:53:09浏览次数:1+次
我们先来看看鼠标捕获的消息流向图:
总结一下,捕获鼠标就是让鼠标消息重定向,在按下鼠标按键的同时,移动到了其他窗口上,依然可以保持鼠标的消息流向捕获鼠标的窗口,包括在窗口外释放窗口的鼠标弹起消息也会流向捕获鼠标的窗口。鼠标弹起之后,就不再被捕获了。而只有鼠标在窗口上或者离开窗口时鼠标按键有一个按键是被按下的,这两种情况才能捕获。
下面是捕获鼠标后,可以在鼠标离开窗口时检测鼠标的客户区坐标,出现了负数坐标。
【鼠标离开窗口时检测鼠标的客户区坐标】
自己运行代码体验吧!下面是完整的测试代码:#include "windows.h"
#include <tchar.h>
TCHAR tip[100]=_T("");
TCHAR txt[100]=_T("C++技术网www.cjjjs.com提示:标题栏显示当前光标的坐标值");
// - 项目是Unicode字符集
LRESULT CALLBACK WinProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
switch (message)
{
case WM_LBUTTONDOWN:
SetCapture(hwnd);//捕获鼠标
return 0;
case WM_LBUTTONUP:
return 0;
case WM_RBUTTONDOWN:
return 0;
case WM_RBUTTONUP:
return 0;
case WM_MBUTTONDOWN:
return 0;
case WM_MBUTTONUP:
return 0;
case WM_MOUSEMOVE:
hdc = GetDC(hwnd);
wsprintf(tip,_T("X:%d Y:%d"),(short)LOWORD(lParam),(short)HIWORD(lParam));
SetWindowText(hwnd,tip);
ReleaseDC(hwnd,hdc);
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd,&ps);
TextOut(hdc,2,10,txt,lstrlen(txt));
EndPaint(hwnd,&ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
default:
break;//跳出到默认处理
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrev,LPSTR lpCmd,int iShow)
{
TCHAR ClassName[] = _T("MyClass");
TCHAR title1[] = _T("C++技术网http://www.cjjjs.com");
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 = WinProc;
wndClass.lpszClassName = ClassName;
wndClass.lpszMenuName=NULL;
wndClass.style=CS_HREDRAW|CS_VREDRAW|CS_DBLCLKS;
if(!RegisterClass(&wndClass))return 0;
HWND hwnd = CreateWindow(ClassName,title1,WS_OVERLAPPEDWINDOW,0,0,350,400,NULL,NULL,hInstance,NULL);
ShowWindow(hwnd,SW_SHOWNORMAL);
MSG msg;
while (GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
相关资讯