以编程方式更改 Windows 笔记本电脑的刷新率

Question

我正在考虑编写一些代码，根据设备是否接通电源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 岁的，另一个是微软的，但是我没有看到具体提到刷新率。

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

有没有人知道如何做到这一点？我不太关心必须使用哪种语言，所以让我知道最可行的语言。当然，我还必须能够检查插入状态的变化 in/unplugged，但我还没有做到这一点。

我的目标主要是 Windows 10，因为这是我的设备。

Answer 1

您可以使用 EnumDisplaySettings to enumerate the information of the current display device, and then set the display by ChangeDisplaySettingsA.

如果要修改刷新率，只需要修改DEVMODEA的dmDisplayFrequency参数即可。

示例如下：

#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, 0, NULL); 
        std::cout << "ChangeDisplaySettingsEx returned " << ret << '\n';
        if (0 != EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &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");
}

这个例子并不总是成功的。能否修改刷新率取决于你的显示器是否支持。这是成功设置的输出：

以编程方式更改 Windows 笔记本电脑的刷新率

Programmatically Change Windows Laptop's Refresh Rate

windows

settings

winapi