[WinAPI] API 1 [桌面上画一个简单彩色图形]

 

#include<Windows.h>
void GdiOut(HDC hdc);
int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    HDC hdc=GetDC(NULL);
    GdiOut(hdc);
    ReleaseDC(NULL,hdc);
}
void GdiOut(HDC hdc)
{
    HPEN hpen;
    HBRUSH hbrush;
    BYTE bRed=0;
    BYTE bGreen=0;
    BYTE bBlue=0;
    COLORREF cPen=RGB(bRed,bGreen,bBlue);
    COLORREF cBrush=RGB(233,GetGValue(cPen),255);
    hpen=CreatePen(PS_SOLID,10,cPen);
    hbrush=CreateSolidBrush(cBrush);
    SelectObject(hdc,hbrush);
    LineTo(hdc,500,500);
    SelectObject(hdc,hpen);
    Rectangle(hdc,200,200,500,500);
    DeleteObject(hpen);
    DeleteObject(hbrush);
}