gdi高dpi示例.

不念不忘少年蓝@ 2022-10-07 04:50 191阅读 0赞

// 编译命令：
    // cl highdpi.cpp /DUNICODE
    // cl highdpi.cpp /DUNICODE /DNODPI /Felowdpi
       
    // 链接指令
    #pragma comment(lib, "kernel32.lib")
    #pragma comment(lib, "user32.lib")
    #pragma comment(lib, "gdi32.lib")
    //#pragma comment(linker, "/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")
       
    // 包含文件
    #include <windows.h>
       
    int g_dpix = 96, g_dpiy = 96;
       
    LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
    { 
        PAINTSTRUCT ps;
        HDC hdc;
        HFONT hfont, holdfont;
        TCHAR *str = TEXT("黑体字输出123456ABCDEF示例");
        static HWND hbtn1, hbtn2, hbtn3, hbtn4;
        switch(message)
        { 
        case WM_CREATE:
            // 重新设置字体，以应用字体的DPI缩放
            SendMessage(hwnd, WM_SETFONT, (WPARAM)GetStockObject(DEFAULT_GUI_FONT), TRUE);
            // 创建控件，注意DPI缩放方法
            hbtn1 = CreateWindowEx(0, TEXT("BUTTON"), TEXT("按钮一"), WS_CHILD|WS_VISIBLE,
                MulDiv(10, g_dpix, 96), MulDiv(10, g_dpiy, 96),
                MulDiv(90, g_dpix, 96), MulDiv(30, g_dpiy, 96),
                hwnd, (HMENU)1, NULL, NULL);
            hbtn2 = CreateWindowEx(0, TEXT("BUTTON"), TEXT("按钮二"), WS_CHILD|WS_VISIBLE,
                MulDiv(110, g_dpix, 96), MulDiv(10, g_dpiy, 96),
                MulDiv(90, g_dpix, 96), MulDiv(30, g_dpiy, 96),
                hwnd, (HMENU)2, NULL, NULL);
            hbtn3 = CreateWindowEx(0, TEXT("BUTTON"), TEXT("按钮三"), WS_CHILD|WS_VISIBLE,
                MulDiv(210, g_dpix, 96), MulDiv(10, g_dpiy, 96),
                MulDiv(90, g_dpix, 96), MulDiv(30, g_dpiy, 96),
                hwnd, (HMENU)3, NULL, NULL);
            hbtn4 = CreateWindowEx(0, TEXT("BUTTON"), TEXT("按钮四"), WS_CHILD|WS_VISIBLE,
                MulDiv(310, g_dpix, 96), MulDiv(10, g_dpiy, 96),
                MulDiv(90, g_dpix, 96), MulDiv(30, g_dpiy, 96),
                hwnd, (HMENU)4, NULL, NULL);
            // 重新设置字体，以应用字体的DPI缩放
            SendMessage(hbtn1, WM_SETFONT, (WPARAM)GetStockObject(DEFAULT_GUI_FONT), TRUE);
            SendMessage(hbtn2, WM_SETFONT, (WPARAM)GetStockObject(DEFAULT_GUI_FONT), TRUE);
            SendMessage(hbtn3, WM_SETFONT, (WPARAM)GetStockObject(DEFAULT_GUI_FONT), TRUE);
            SendMessage(hbtn4, WM_SETFONT, (WPARAM)GetStockObject(DEFAULT_GUI_FONT), TRUE);
            return 0;
        case WM_PAINT:
            hdc = BeginPaint(hwnd, &ps);
            // 创建字体，注意字体高度的取值（和Word中相同）和缩放
            hfont = CreateFont(-MulDiv(16, g_dpiy, 72), 0, 0, 0, FW_THIN, FALSE, FALSE, FALSE,
                    DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS,
                    DEFAULT_QUALITY, FF_DONTCARE, TEXT("SimHei"));
            holdfont = (HFONT)SelectObject(hdc, hfont);
            // 输出文字，注意起始位置的缩放
            TextOut(hdc, MulDiv(10, g_dpix, 96), MulDiv(50, g_dpiy, 96), str, lstrlen(str));
            // 释放资源
            SelectObject(hdc, holdfont);
            DeleteObject(hfont);
            EndPaint(hwnd, &ps);
            return 0;
        case WM_DESTROY:
            // 退出程序
            PostQuitMessage(0);
            return 0;
        default:
            return DefWindowProc(hwnd, message, wParam, lParam);
        }
    }
       
    int WINAPI WinMain(HINSTANCE hinst, HINSTANCE, LPSTR, int ncmdshow)
    { 
        // 关闭DPI缩放
        FARPROC spdpia = GetProcAddress(GetModuleHandle(TEXT("user32")), "SetProcessDPIAware");
    #ifndef NODPI
        if (spdpia != NULL) spdpia(); // 去掉这一句可看到DPI缩放效果
    #endif
       
        // 获取DPI
        HDC hdc = GetDC(NULL);
        if (hdc != NULL) { 
            g_dpix = GetDeviceCaps(hdc, LOGPIXELSX);
            g_dpiy = GetDeviceCaps(hdc, LOGPIXELSY);
            ReleaseDC(NULL, hdc);
        }
       
        // 注册窗口类
        WNDCLASSEX wc = { 
            sizeof wc,
            CS_VREDRAW|CS_HREDRAW,
            WndProc,
            0,
            DLGWINDOWEXTRA,
            NULL,
            LoadIcon(NULL, IDI_APPLICATION),
            LoadCursor(NULL, IDC_ARROW),
            (HBRUSH)GetStockObject(WHITE_BRUSH),
            NULL,
            TEXT("MyWndClass"),
            LoadIcon(NULL, IDI_APPLICATION)
        };
        if (!RegisterClassEx(&wc)) return 1;
           
        // 在标题栏显示DPI数值
        TCHAR title[200] = TEXT("");
        wsprintf(title, TEXT("DPI: %d, %d"), g_dpix, g_dpiy);
       
        // 创建窗口，注意DPI缩放方法
        HWND hWnd = CreateWindowEx(0, TEXT("MyWndClass"), title, WS_OVERLAPPEDWINDOW,
                CW_USEDEFAULT, CW_USEDEFAULT,
                MulDiv(500, g_dpix, 96), MulDiv(300, g_dpiy, 96),
                NULL, NULL, NULL, NULL);
       
        // 显示和更新窗口
        ShowWindow(hWnd, ncmdshow);
        UpdateWindow(hWnd);
       
        // 消息循环
        MSG msg;
        while (GetMessage(&msg, 0, 0, 0))
        { 
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
       
        return (int)msg.wParam;
    }

[这里有微软参考][Link 1]  
[另一个参考][Link 2]

[Link 1]: https://docs.microsoft.com/zh-cn/windows/win32/hidpi/high-dpi-desktop-application-development-on-windows?redirectedfrom=MSDN
[Link 2]: http://www.cppblog.com/weiym/archive/2014/02/18/205841.html