更新时间:2016-01-03 22:21:56浏览次数:1+次
if (VK_BACK==wParam)
{
int ic = LOWORD(lParam);//低字部分存储了按键重复的次数编号
if (ic==2)
{
iDelCount=lstrlen(cjjjs);//将删除的字数设置为字符串的长度
}
else
{
iDelCount++;//不累计就删除一个字符
Sleep(70);//70毫秒的延迟处理,就可能累计重复计数一次
}
}
删除的逻辑在文中开始提到的文章有详细解释。其实长按按键删除所有文字的代码本身很简单,难就难在基础知识的深入了解。所谓大道至简就是这回事,只有你了解的足够多,你就可以用最简单的代码实现人家花很多几十行才能够实现的功能。这也就是要学习基础技术的重要性。 #include "windows.h"
#include <tchar.h>
// - 项目是Unicode字符集
TCHAR cjjjs[100]=_T("C++技术网http:www.cjjjs.comC++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)-iDelCount);
TextOut(hdc,0,50,tip2,lstrlen(tip2));
EndPaint(hwnd,&ps);
return 0;
case WM_KEYDOWN:
if (VK_BACK==wParam)
{
int ic = LOWORD(lParam);//低字部分存储了按键重复的次数编号
if (ic==2)
{
iDelCount=lstrlen(cjjjs);
}
else
{
iDelCount++;
Sleep(70);//70毫秒的延迟处理,就可能累计重复计数
}
}
InvalidateRect(hwnd,NULL,TRUE);
return 0;
case WM_RBUTTONDOWN:
{
iDelCount=0;
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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