LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)

{

    HDC hdc;

    PAINTSTRUCT ps;

    RECT rect;

    static HBRUSH hBrush, hOldBrush;

    switch (message)

    {

    case WM_PAINT:

        hdc = BeginPaint(hwnd, &ps);

        GetClientRect(hwnd, &rect);

//系统画刷数共有11个

//画刷是使用8X8像素的位图进行填充的，而不是像素点。效率高

        //获取系统画刷（不要用deleteObject删除）

        //hBrush=GetStockObject(LTGRAY_BRUSH);//浅灰色

        //hBrush = GetStockObject(NULL_BRUSH);//不设置画刷，则是不进行填充

        //设置自定义画刷createSolidBrush,createHatchBrush,createBrushIndirect

        //hBrush=CreateSolidBrush(RGB(255,255,0));

        //hBrush = CreateHatchBrush(HS_BDIAGONAL, RGB(0, 255, 0));//数字是样式 查手册

        LOGBRUSH bh[];

        for (int i = ; i < ; i++)

        {

            bh[i].lbStyle = BS_HATCHED;

            bh[i].lbHatch = i;

            bh[i].lbColor = RGB(i * 4, , );

        }

        //最后一个是系统画刷，不需要删除

        bh[].lbStyle = BS_SOLID;

        bh[].lbColor = RGB(, , );

        //用于记录所需要删除的画刷

        HBRUSH TotBrush[];

        //绘制6个矩形，填充不同

        for (int i = ; i < ;i++)

        {

            hBrush=CreateBrushIndirect(&bh[i]);

            if (i < )

                TotBrush[i] = hBrush;

            SelectObject(hdc, hBrush);

            Rectangle(hdc,  +  * i, ,  +  * i, );

        }

        for (int i = ; i < ;i++)

        {

            DeleteObject(TotBrush[i]);

        }

        //替换画刷

//        hOldBrush = SelectObject(hdc, hBrush);

        //中间写字

//         SetTextAlign(hdc,TA_CENTER);

//         TextOut(hdc, rect.right / 2, rect.bottom / 2, L"this a test", 11);

//         SetTextAlign(hdc, TA_LEFT);

//         Ellipse(hdc, rect.right / 4, rect.bottom / 4 , rect.right * 3 / 4, rect.bottom * 3 / 4);

        SelectObject(hdc, hOldBrush);

        EndPaint(hwnd, &ps);

        break;

    case WM_DESTROY:

        //DeleteObject(hBrush);//必须是自定义画刷

        PostQuitMessage();

        return ;

    }

    return DefWindowProc(hwnd, message, wParam, lParam);

}