使用API函数在用户区绘图、输出文本

 

#include<windows.h>
#include<stdlib.h>
#include<string.h>
long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam);
BOOL InitWindowsClass(HINSTANCE hInstance);
BOOL InitWindows(HINSTANCE hInstance,int nCmdShow);
 
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPreInstance,LPSTR lpCmdLine,int nCmdShow)
{
       MSG Message;
       if(!InitWindowsClass(hInstance))
              return FALSE;
       if(!InitWindows(hInstance,nCmdShow))
              return FALSE;
       while(GetMessage(&Message,0,0,0))
       {
              TranslateMessage(&Message);
              DispatchMessage(&Message);
       }
       return Message.wParam;
}
 
 
             
long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam)
{
       HDC hDC;
       HBRUSH hBrush;
       HPEN hPen;
       PAINTSTRUCT PtStr;
       static long nXChar,nCaps,nYChar,pointx,pointy;
    TEXTMETRIC tm;
    static char *textbuf[]=
       {
           "故人西辞黄鹤楼",
           "烟花三月下扬州",
           "孤帆远影碧空尽",
           "唯见长江天际流",
       };
       switch(iMessage)
       {
       case WM_CREATE:
           hDC=GetDC(hWnd);
           GetTextMetrics(hDC,&tm)
e28f
;
           nXChar=tm.tmAveCharWidth;
           nYChar=tm.tmHeight+tm.tmExternalLeading;
           ReleaseDC(hWnd,hDC);
           return 0;
       case WM_PAINT:
                     hDC=BeginPaint(hWnd,&PtStr);
                     SetMapMode(hDC,MM_ANISOTROPIC);
                     hPen=CreatePen(PS_SOLID,2,RGB(255,0,0));
                     SelectObject(hDC,hPen);
                     POINT point1[3];
                     point1[0].x=50;
                     point1[0].y=50;
                     point1[1].x=100;
                     point1[1].y=50;
                     point1[2].x=75;
                     point1[2].y=100;
                     Polygon(hDC,point1,3);
                     Ellipse(hDC,50,100,100,150);
                     POINT point2[5];
                     point2[0].x=75;
                     point2[0].y=150;
                     point2[1].x=50;
                     point2[1].y=175;
                     point2[2].x=50;
                     point2[2].y=225;
                     point2[3].x=100;
                     point2[3].y=225;
                     point2[4].x=100;
                     point2[4].y=175;
                     Polygon(hDC,point2,5);
                     hBrush=(HBRUSH)GetStockObject(BLACK_BRUSH);
                     SelectObject(hDC,hBrush);
                     RoundRect(hDC,200,50,250,100,15,15);
                     Pie(hDC,200,100,250,150,215,100,230,100);
                     Rectangle(hDC,200,150,250,200);
                    
                 int i,j;
                 for(i=4;i>0;i--)
                        for(j=0;j<7;j++)
                        {
                               pointx=500+i*nXChar*5;
                               pointy=50+j*(nYChar+nCaps);
                               TextOut(hDC, pointx, pointy,textbuf[4-i]+j*2,2);
                        }
 
           EndPaint(hWnd,&PtStr);
                     return 0;
       case WM_DESTROY:
              PostQuitMessage(0);
              return 0;
       default:
              return(DefWindowProc(hWnd,iMessage,wParam,lParam));
       }
}
 
BOOL InitWindows(HINSTANCE hInstance,int nCmdShow)
{
       HWND hWnd;
       hWnd=CreateWindow("WinFill",
              "VC++ 实习一",
              WS_OVERLAPPEDWINDOW,
              CW_USEDEFAULT,
              0,
              CW_USEDEFAULT,
              0,
              NULL,
              NULL,
              hInstance,
              NULL);
       if(!hWnd)
              return FALSE;
       ShowWindow(hWnd,nCmdShow);
       UpdateWindow(hWnd);
       return TRUE;
}
 
BOOL InitWindowsClass(HINSTANCE hInstance)
{
       WNDCLASS WndClass;
       WndClass.cbClsExtra=0;
       WndClass.cbWndExtra=0;
       WndClass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
       WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);
       WndClass.hIcon=LoadIcon(NULL,"END");
       WndClass.hInstance=hInstance;
       WndClass.lpfnWndProc=WndProc;
       WndClass.lpszClassName="WinFill";
       WndClass.lpszMenuName=NULL;
       WndClass.style=CS_HREDRAW|CS_VREDRAW;
       return RegisterClass(&WndClass);
}