高DPI的Win32程序示例

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效果：

源代码（TEXT("")是可移植字符串，Unicode编译为L""，ANSI编译为""）：

// 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;}

如果此程序不需要支持Windows Vista之前的操作系统（如Windows XP），那么调用SetProcessDPIAware时不需要这么麻烦，程序启动时直接SetProcessDPIAware();调用即可。

SetProcessDPIAware这个貌似不需要调用
vc里面在编译选项的manifest里有DPI Aware的设置
窝那个情怀菜单就素这么做的

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