如何从hWnd获取显示器屏幕分辨率?

时间:2010-01-28 16:46:01

标签: winapi screen-resolution

如何从hWnd获取显示器屏幕分辨率?

我正在使用hWnd,因为窗口可以位于多个监视器中的任何一个上。

即。 hWnd顶部/左侧坐标位于屏幕分辨率为800 x 600的显示器上。

我用一种名为PL / B的语言编程,它允许调用Windows API。

可以使用哪些窗口API?

6 个答案:

答案 0 :(得分:20)

这是一个适合我的C ++代码示例:

HMONITOR monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
MONITORINFO info;
info.cbSize = sizeof(MONITORINFO);
GetMonitorInfo(monitor, &info);
int monitor_width = info.rcMonitor.right - info.rcMonitor.left;
int monitor_height = info.rcMonitor.bottom - info.rcMonitor.top;

答案 1 :(得分:19)

user32函数MonitorFromWindow允许您传入一个hwnd,并返回它所在的监视器的句柄(或默认情况下 - 有关详细信息,请参阅链接的MSDN文章)。有了它,您可以致电GetMonitorInfo来检索MONITORINFO struct,其中包含详细说明其解决方案的RECT。

有关详细信息,请参阅MSDN的Multiple Screens Reference部分。

我会添加示例代码,但我不知道您引用的语言,我不知道C#示例代码对您有多大帮助。如果您认为它会有所帮助,请告诉我,我会快速编写一些代码。

答案 2 :(得分:5)

还有GetSystemMetrics,请在msdn上查看

答案 3 :(得分:2)

这里有一些C#代码通过P / Invoke获得分辨率(在DPI中):

public static void GetWindowDpi(IntPtr hwnd, out int dpiX, out int dpiY)
{
    var handle = MonitorFromWindow(hwnd, MonitorFlag.MONITOR_DEFAULTTOPRIMARY);

    GetDpiForMonitor(handle, MonitorDpiType.MDT_EFFECTIVE_DPI, out dpiX, out dpiY);
}

/// <summary>
/// Determines the function's return value if the window does not intersect any display monitor.
/// </summary>
[SuppressMessage("ReSharper", "IdentifierTypo")]
[SuppressMessage("ReSharper", "UnusedMember.Local")]
private enum MonitorFlag : uint
{
    /// <summary>Returns NULL.</summary>
    MONITOR_DEFAULTTONULL = 0,
    /// <summary>Returns a handle to the primary display monitor.</summary>
    MONITOR_DEFAULTTOPRIMARY = 1,
    /// <summary>Returns a handle to the display monitor that is nearest to the window.</summary>
    MONITOR_DEFAULTTONEAREST = 2
}

[DllImport("user32.dll")]
private static extern IntPtr MonitorFromWindow(IntPtr hwnd, MonitorFlag flag);

[SuppressMessage("ReSharper", "IdentifierTypo")]
[SuppressMessage("ReSharper", "UnusedMember.Local")]
private enum MonitorDpiType
{
    /// <summary>
    /// The effective DPI.
    /// This value should be used when determining the correct scale factor for scaling UI elements.
    /// This incorporates the scale factor set by the user for this specific display.
    /// </summary>
    MDT_EFFECTIVE_DPI = 0,
    /// <summary>
    /// The angular DPI.
    /// This DPI ensures rendering at a compliant angular resolution on the screen.
    /// This does not include the scale factor set by the user for this specific display.
    /// </summary>
    MDT_ANGULAR_DPI = 1,
    /// <summary>
    /// The raw DPI.
    /// This value is the linear DPI of the screen as measured on the screen itself.
    /// Use this value when you want to read the pixel density and not the recommended scaling setting.
    /// This does not include the scale factor set by the user for this specific display and is not guaranteed to be a supported DPI value.
    /// </summary>
    MDT_RAW_DPI = 2
}

[DllImport("user32.dll")]
private static extern bool GetDpiForMonitor(IntPtr hwnd, MonitorDpiType dpiType, out int dpiX, out int dpiY);

答案 4 :(得分:0)

适用于高分辨率 2K 4K > 1920 像素的显示器

void GetDesktopResolution(int* horizontal, int* vertical)
{

    HDC hScreenDC = GetDC(GetDesktopWindow());
    int width = GetDeviceCaps(hScreenDC, HORZRES);
    int height = GetDeviceCaps(hScreenDC, VERTRES);
    ReleaseDC(GetDesktopWindow(), hScreenDC);

    RECT desktop;
    const HWND hDesktop = GetDesktopWindow();
    GetWindowRect(hDesktop, &desktop);
    
    if (width > 2000)
    {
        const POINT ptZero = { 0, 0 };
        HMONITOR mon = MonitorFromPoint(ptZero, MONITOR_DEFAULTTOPRIMARY);

        DEVICE_SCALE_FACTOR f;// vers < win 8 = GetScaleFactorForDevice(DEVICE_PRIMARY);
        GetScaleFactorForMonitor(mon,&f);
        if (f > 110)
        {
            *horizontal = width * ((f+10) / 100.0);
            *vertical = height * ((f+10) / 100.0);
        }
        else
        {
            *horizontal = width;
            *vertical = height;
        }
    }
    else
    {
        *horizontal = desktop.right;
        *vertical = desktop.bottom;
    }
}

答案 5 :(得分:-1)

RECT windowsize;    // get the height and width of the screen
GetClientRect(hwnd, &windowsize);

int srcheight = windowsize.bottom;
int srcwidth = windowsize.right;