更新时间:2016-01-06 23:32:02浏览次数:1+次
下面是使用测试代码的运行截图:
BYTE btHiByte = HIBYTE(HIWORD(lParam));
bool bIsBeforeDown = btHiByte&0x40;//之前是否为按下状态
并将提取的结果存入一个布尔变量。如果为true则表示之前的状态是被按下的,否则之前的状态就是弹起的。如果之前的状态是按下的,我们在WM_KEYDOWN或者WM_SYSKEYDOWN消息中处理按键按下的消息,也就意味着这个按键是长按的状态,就可以执行我们的长按删除功能了。#include "windows.h"
#include <tchar.h>
#define MAX 100
TCHAR tip[MAX]=_T("");
// - 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_PAINT:
hdc = BeginPaint(hwnd,&ps);
TextOut(hdc,0,0,tip,lstrlen(tip));
EndPaint(hwnd,&ps);
return 0;
case WM_KEYDOWN:
{
BYTE btHiByte = HIBYTE(HIWORD(lParam));
bool bIsBeforeDown = btHiByte&0x40;//之前是否为按下状态
if (bIsBeforeDown)
{
wsprintf(tip,_T("此键先前是按下的,执行全部删除操作"));
}
else
{
wsprintf(tip,_T("此键先前是弹起的"));
}
InvalidateRect(hwnd,NULL,TRUE);
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_HAND);
wndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndClass.hInstance = hInstance;
wndClass.lpfnWndProc = WinProc;
wndClass.lpszClassName = ClassName;
wndClass.lpszMenuName=NULL;
wndClass.style=CS_HREDRAW|CS_VREDRAW;
if(!RegisterClass(&wndClass))return 0;
HWND hwnd = CreateWindow(ClassName,title1,WS_OVERLAPPEDWINDOW,0,0,650,400,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