更新时间:2016-01-25 23:04:56浏览次数:1+次
我们先设置一个小的剪切区域输出字符串,然后恢复为客户区范围的剪切区域,再输出完整的字符串。你会发现前面输出的字符串并不完整哦。下面是效果图:
#include "windows.h"
#include <tchar.h>
TCHAR txt[100]=_T("C++技术网http://www.cjjjs.com");
// - 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);
//设置矩形(0,0,100,100)范围为剪切区域,无法显示完整字符串
HRGN hRgn = CreateRectRgn(0,0,100,100);
SelectObject(hdc,hRgn);//剪切区开始生效
TextOut(hdc,50,50,txt,lstrlen(txt));
DeleteObject(hRgn);//删除区域
//恢复剪切区域为客户区,则可以完成显示字符串
RECT rect;
GetClientRect(hwnd,&rect);//获取客户区矩形
HRGN hRgnClient = CreateRectRgnIndirect(&rect);
SelectClipRgn(hdc,hRgnClient);//剪切区开始生效
TextOut(hdc,50,70,txt,lstrlen(txt));
DeleteObject(hRgnClient);//删除区域
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,10,100,550,400,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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