MFC获取Windows DPI

2019-11-08 02:01:24

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MFC获取Windows DPI

flyfish

OSVERSIONINFO osvi; ZeroMemory(&osvi, sizeof(OSVERSIONINFO)); osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); GetVersionEx(&osvi);

根据osvi的两个变量dwMajorVersion，dwMinorVersion来区分版本

Win8.1系统以下，不包括Win8.1获取方法

// pixels in screen dcHDC hdc = GetDC(NULL);if (hdc){g_dpiX = GetDeviceCaps(hdc, LOGPIXELSX);//每英寸逻辑像素数水平g_dpiY = GetDeviceCaps(hdc, LOGPIXELSY);//每英寸逻辑像素数垂直 ReleaseDC(NULL, hdc);}

Win8.1以上系统，包括Win8.1获取方法

HMONITOR hMonitor; POINT pt; HRESULT hr = E_FAIL; pt.x = 1; pt.y = 1; hMonitor = MonitorFromPoint(pt, MONITOR_DEFAULTTONEAREST); hr = GetDpiForMonitor(hMonitor, MDT_EFFECTIVE_DPI, &g_dpiX, &g_dpiY);

设置缩放比例

UINT m_nScaleFactor;void SetScale(__in UINT iDPI){ m_nScaleFactor = MulDiv(iDPI, 100, 96); //MulDiv(a,b,c) a*b/c}

关于API GetDpiForMonitor function说明区分操作系统的原因

Minimum supported clientWindows 8.1 [desktop apps only]Minimum supported serverWindows Server 2012 R2 [desktop apps only]HeaderShellScalingAPI.h

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