發信人: heibow.bbs@bbs.mgt.ncu.edu.tw (速度金屬)
日期: 25 Jan 2000 20:06:46 GMT
標題: Re: 問一下SetWindowRgn()
信群: tw.bbs.comp.language    看板: Program
來源: <3YZQiN$Sz7@bbs.mgt.ncu.edu.tw>:24706, bbs.mgt.ncu.edu.tw
組織: 中大資管龍貓資訊天地

==> KingArthur.bbs@bbs.et.ntust.edu.tw (Sephiroth) 提到:
: SetWindowRgn()是不是只能用一次啊？
: 用了第二次以後程式就變得怪怪的了，
: 萬一只能用一次，那我要如何改變Region呢？

可以用好幾次啊,
請看如下的範例,
按 F1, F2 有不同的功能
F1 是放大, F2 是縮小
用 SDK 寫的
相信您也是吧...

#include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
     {
     static char szAppName[] = "HelloWin" ;
     HWND        hwnd ;
     MSG         msg ;
     WNDCLASSEX  wndclass ;

     wndclass.cbSize        = sizeof (wndclass) ;
     wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
     wndclass.lpfnWndProc   = WndProc ;
     wndclass.cbClsExtra    = 0 ;
     wndclass.cbWndExtra    = 0 ;
     wndclass.hInstance     = hInstance ;
     wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;
     wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
     wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
     wndclass.lpszMenuName  = NULL ;
     wndclass.lpszClassName = szAppName ;
     wndclass.hIconSm       = LoadIcon (NULL, IDI_APPLICATION) ;

     RegisterClassEx (&wndclass) ;

     hwnd = CreateWindow (szAppName,         // window class name
                            "The Hello Program",     // window caption
                    WS_OVERLAPPEDWINDOW,     // window style
                    CW_USEDEFAULT,           // initial x position
                    CW_USEDEFAULT,           // initial y position
                    CW_USEDEFAULT,           // initial x size
                    CW_USEDEFAULT,           // initial y size
                    NULL,                    // parent window handle
                    NULL,                    // window menu handle
                    hInstance,               // program instance handle
                            NULL) ;                          // creation parameters

     ShowWindow (hwnd, iCmdShow) ;
     UpdateWindow (hwnd) ;

     while (GetMessage (&msg, NULL, 0, 0))
          {
          TranslateMessage (&msg) ;
          DispatchMessage (&msg) ;
          }
     return msg.wParam ;
     }

LRESULT CALLBACK WndProc (HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
     {
     HDC         hdc ;
     PAINTSTRUCT ps ;
     RECT        rect ;
  HRGN RoundRgn;
  HRGN h2;
  static int Width=100,Height=100;

     switch (iMsg)
          {
          case WM_KEYDOWN:
              switch(wParam)
              {
                  case VK_F1:
                         Width+=10;
                         Height+=10;
                    break;
                  case VK_F2:
                         Width-=10;
                         Height-=10;
                    break;
              }
             h2=CreateRectRgn(0,0,Width,Height);
             SetWindowRgn(hwnd,h2,true);
                                break;
          case WM_CREATE :
               return 0 ;

          case WM_PAINT :
                   hdc = BeginPaint (hwnd, &ps) ;

               GetClientRect (hwnd, &rect) ;

               DrawText (hdc, "Hello, Windows 95!", -1, &rect,
                                     DT_SINGLELINE | DT_CENTER | DT_VCENTER) ;

                   EndPaint (hwnd, &ps) ;
               return 0 ;

          case WM_DESTROY :
               PostQuitMessage (0) ;
               return 0 ;
          }

     return DefWindowProc (hwnd, iMsg, wParam, lParam) ;
     }

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