【物理分辨率】与【逻辑分辨率】

HWND hwnd_desktop = GetDesktopWindow();
HDC hdc = GetWindowDC(hwnd_desktop);

//【物理分辨率】:显示屏的最佳分辨率 ( win 10 上【显示分辨率】中设置的分辨率 )
int w1 = GetDeviceCaps(hdc, DESKTOPHORZRES); 
int h1 = GetDeviceCaps(hdc, DESKTOPVERTRES);

ReleaseDC(hwnd_desktop, hdc); //释放

printf("物理分辨率:%d x %d\n", w1, h1);

HWND hwnd_desktop = GetDesktopWindow();
HDC hdc = GetWindowDC(hwnd_desktop);

int w2 = GetDeviceCaps(hdc, HORZRES); //【逻辑分辨率】
int h2 = GetDeviceCaps(hdc, VERTRES);

ReleaseDC(hwnd_desktop, hdc); //释放

printf("逻辑分辨率:%d x %d\n", w2, h2);

//【物理分辨率】与【逻辑分辨率】的缩放比例

float dpiScaleX = w1 * 1.0 / w2;
float dpiScaleY = h1 * 1.0 / h2;

printf("scaleX:%f, scaleY:%f\n", dpiScaleX, dpiScaleY);