以编程方式更改Windows笔记本电脑的刷新率

问题描述

我正在考虑对某些内容进行编码，以根据是否插入设备来改变笔记本电脑的刷新率。

根据我的研究，这是我遇到的两个链接。一个是20岁，另一个是来自Microsoft，但我没有特别提到刷新率。

https://www.codeproject.com/Articles/558/Changing-your-monitor-s-refresh-rate

https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-changedisplaysettingsa?redirectedfrom=MSDN

有人对此有任何见识吗？我不太需要使用哪种语言，所以让我知道什么是最可行的。当然，我还必须能够检查插入/未插入状态的变化，但是我还没有达到这一点。

我主要针对Windows 10，因为这是我的设备所使用的。

解决方法

您可以使用EnumDisplaySettings枚举当前显示设备的信息，然后通过ChangeDisplaySettingsA设置显示。

如果要修改刷新率，只需修改DEVMODEA的dmDisplayFrequency参数。

以下是示例：

#include <Windows.h>
#include <iostream>

using namespace std;

int main(int argc,const char* argv[]) 
{
    DEVMODE dm;
    ZeroMemory(&dm,sizeof(dm));
    dm.dmSize = sizeof(dm);
    if (0 != EnumDisplaySettings(NULL,ENUM_CURRENT_SETTINGS,&dm))
    {
        cout << "DisplayFrequency before setting = " << dm.dmDisplayFrequency << endl;
        dm.dmDisplayFrequency = 60; //set the DisplayFrequency
        LONG ret = ChangeDisplaySettingsEx(NULL,&dm,NULL,NULL); 
        std::cout << "ChangeDisplaySettingsEx returned " << ret << '\n';
        if (0 != EnumDisplaySettings(NULL,&dm))
        {
            cout << "DisplayFrequency after setting = " << dm.dmDisplayFrequency << endl;
        }
        switch (ret) 
        {
        case DISP_CHANGE_SUCCESSFUL: 
            std::cout << "display successfully changed\n"; 
            break;
        case DISP_CHANGE_BADDUALVIEW:
            std::cout << "The settings change was unsuccessful because the system is DualView capable\n";
            break;
        case DISP_CHANGE_BADFLAGS: 
            std::cout << "An invalid set of flags was passed in.\n"; 
            break;
        case DISP_CHANGE_BADMODE: 
            std::cout << "The graphics mode is not supported.\n"; 
            break;
        case DISP_CHANGE_BADPARAM: 
            std::cout << "An invalid parameter was passed in. This can include an invalid flag or combination of flags.\n"; 
            break;
        case DISP_CHANGE_FAILED: 
            std::cout << "The display driver failed the specified graphics mode.\n"; 
            break;
        case DISP_CHANGE_NOTUPDATED: 
            std::cout << "Unable to write settings to the registry.\n"; 
            break;
        case DISP_CHANGE_RESTART: 
            std::cout << "The computer must be restarted for the graphics mode to work.\n";
            break;
        }
    } 
    system("pause");
}

此示例并非总是成功。是否可以修改刷新率取决于显示器是否支持刷新率。这是成功设置的输出：