QT程序的dpi导致显示异常处理方法

Acnidouwo2026-04-22 8:44

#include "mainwindow.h"

#include

#ifdef Q_OS_WIN

#include <windows.h>

// 定义必要的常量和函数类型

typedef enum _PROCESS_DPI_AWARENESS {

PROCESS_DPI_UNAWARE = 0,

PROCESS_SYSTEM_DPI_AWARE = 1,

PROCESS_PER_MONITOR_DPI_AWARE = 2

} PROCESS_DPI_AWARENESS;

typedef enum _DPI_AWARENESS_CONTEXT {

DPI_AWARENESS_CONTEXT_UNAWARE = -1,

DPI_AWARENESS_CONTEXT_SYSTEM_AWARE = -2,

DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE = -3,

DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 = -4

} DPI_AWARENESS_CONTEXT;

// 设置DPI为系统处理（不依赖shellscalingapi.h）

void forceSystemDPIScaling()

{

// 尝试使用SetProcessDpiAwarenessContext (Windows 10 1703+)

HMODULE user32 = LoadLibraryA("user32.dll");

if (user32) {

// 定义函数指针类型

typedef BOOL (WINAPI *SetProcessDpiAwarenessContextFunc)(DPI_AWARENESS_CONTEXT);

SetProcessDpiAwarenessContextFunc pFunc =

(SetProcessDpiAwarenessContextFunc)GetProcAddress(user32, "SetProcessDpiAwarenessContext");

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    if (pFunc) {
        // 关键：让系统处理DPI缩放
        pFunc(DPI_AWARENESS_CONTEXT_UNAWARE);
        qDebug() << "Set DPI awareness context to UNAWARE";
        FreeLibrary(user32);
        return;
    }
    FreeLibrary(user32);
}

// 尝试使用SetProcessDpiAwareness (Windows 8.1+)
HMODULE shcore = LoadLibraryA("Shcore.dll");
if (shcore) {
    typedef HRESULT (WINAPI *SetProcessDpiAwarenessFunc)(PROCESS_DPI_AWARENESS);
    SetProcessDpiAwarenessFunc pFunc =
        (SetProcessDpiAwarenessFunc)GetProcAddress(shcore, "SetProcessDpiAwareness");

    if (pFunc) {
        pFunc(PROCESS_DPI_UNAWARE);
        qDebug() << "Set process DPI awareness to UNAWARE";
        FreeLibrary(shcore);
        return;
    }
    FreeLibrary(shcore);
}

// 最后回退：不调用SetProcessDPIAware()，因为我们要的是未感知
qDebug() << "Using default DPI handling (system managed)";

}

#endif

int main(int argc, char *argv\[\])

{

#ifdef Q_OS_WIN

// 设置DPI为系统处理

forceSystemDPIScaling();

#endif

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// 完全禁用Qt的DPI处理
QCoreApplication::setAttribute(Qt::AA_DisableHighDpiScaling);


QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();

}