更新时间:2016-01-03 22:10:14浏览次数:1+次
所以我的假设和验证图如下:
if (VK_BACK==wParam)
{
if (bisFirst)
{
Sleep(2000);//第一次消息 进行延迟
bisFirst=false;
}
else
{
//第一次的按键不输出,只输出长按按键产生的重复的WM_KEYDOWN消息
int ic = LOWORD(lParam);//低字部分存储了按键重复的次数编号
wsprintf(tip,_T("%s %d"),tip,ic);//将历次的编号格式化到字符串数组中
//以后没有延迟的长按都会迅速被处理,也就看到的计数是1
}
}
InvalidateRect(hwnd,NULL,TRUE);//刷新显示结果
执行的结果如下图所示:
#include "windows.h"
#include <tchar.h>
// - 项目是Unicode字符集
TCHAR cjjjs[100]=_T("C++技术网http:www.cjjjs.com");
//TCHAR tip2[100]=_T("提示:按下键盘的←(退格键)可以删除了字符");
TCHAR tip[100]=_T("");
LRESULT CALLBACK WinProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
static RECT rect;
static int iDelCount=0;
static int sum=0;
static bool bisFirst=true;
switch (message)
{
case WM_PAINT:
hdc = BeginPaint(hwnd,&ps);
SelectObject(hdc,GetStockObject(SYSTEM_FIXED_FONT));
TextOut(hdc,0,0,cjjjs,lstrlen(cjjjs));
TextOut(hdc,0,50,tip,lstrlen(tip));
EndPaint(hwnd,&ps);
return 0;
case WM_KEYDOWN:
if (VK_BACK==wParam)
{
if (bisFirst)
{
Sleep(2000);//第一次消息 进行延迟
bisFirst=false;
}
else
{
//第一次的按键不输出,只输出长按按键产生的重复的WM_KEYDOWN消息
int ic = LOWORD(lParam);//低字部分存储了按键重复的次数编号
wsprintf(tip,_T("%s %d"),tip,ic);//将历次的编号格式化到字符串数组中
//以后没有延迟的长按都会迅速被处理,也就看到的计数是1
}
}
InvalidateRect(hwnd,NULL,TRUE);//刷新显示结果
return 0;
case WM_RBUTTONDOWN:
{
InvalidateRect(hwnd,NULL,TRUE);
}
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
default:
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,0,0,440,400,NULL,NULL,hInstance,NULL);
ShowWindow(hwnd,SW_SHOWNORMAL);
MSG msg;
while (GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
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