VC获取屏幕分辨率，物理大小和刷新频率

红太狼 2022-02-23 04:14 559阅读 0赞

#include <stdio.h>  
    #include <math.h>  
    #include <windows.h>  
    #include <cstdlib>
    
    int main(int argc, char *argv[])
    {
    	// 物理尺寸
    	int nScreenPhysicsWidth = 0, nScreenPhysicsHeight = 0;
    	// 像素尺寸
    	long nScreenPixelWidth = 0, nScreenPixelHeight = 0;
    	// 屏幕刷新频率
    	long nDisplayFrequency = 0;
    
    	// 获取物理尺寸
    	HDC hdcScreen = ::GetDC(NULL);   
    	nScreenPhysicsWidth = ::GetDeviceCaps(hdcScreen, HORZSIZE);
    	nScreenPhysicsHeight = ::GetDeviceCaps(hdcScreen, VERTSIZE);
    	::ReleaseDC(NULL, hdcScreen);
    
    	// 获取像素尺寸和刷新频率
    	DEVMODE   dm;
    	dm.dmSize = sizeof(DEVMODE);
    	::EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
    	nScreenPixelWidth = dm.dmPelsWidth;
    	nScreenPixelHeight = dm.dmPelsHeight;
    	nDisplayFrequency = dm.dmDisplayFrequency;
    
    	printf("屏幕物理尺寸 : 宽: %d mm, 高: %dmm.\n", nScreenPhysicsWidth, nScreenPhysicsHeight);
    	printf("屏幕分辨率 : 宽: %d px, 高: %d px.\n", nScreenPixelWidth, nScreenPixelHeight);
    	printf("屏幕刷新频率 : %d Hz.\n", nDisplayFrequency);
    
    	// 1in(英寸) = 25.4mm(毫米)
    	const double MILLIMETRE_2_INCH = 1 / 25.4;
    	// 计算对角线长度
    	double diagonalLen = sqrt(nScreenPhysicsWidth * nScreenPhysicsWidth + nScreenPhysicsHeight * nScreenPhysicsHeight);
    	printf("屏幕对角线长为：%.2lf mm, 约 %.2lf in.\n", diagonalLen, diagonalLen * MILLIMETRE_2_INCH);
    
    	system("pause");
    	return 0;
    }

对于高DPI屏幕，可以使用以下方式获取像素分辨率，用来设置高分辨率屏幕时窗口全屏显示：

// <windows.h>	
    UINT dpi = ::GetDpiForSystem();
    int cx = ::GetSystemMetricsForDpi(SM_CXFULLSCREEN, dpi);
    int cy = ::GetSystemMetricsForDpi(SM_CYFULLSCREEN, dpi);