Windows GUI: Use older API for getting system DPI

Use older API to get system DPI for taking DPI scaling into account when setting window size so that it works on older Windows versions.
JeromeMartinez · May 31, 2024 · 4cb609f · 4cb609f
1 parent fb4fe15
commit 4cb609f
Showing 1 changed file with 10 additions and 1 deletion.
diff --git a/Source/GUI/VCL/GUI_Main.cpp b/Source/GUI/VCL/GUI_Main.cpp
@@ -243,7 +243,16 @@ __fastcall TMainF::TMainF(TComponent* Owner)
 void __fastcall TMainF::GUI_Configure()
 {
     //Hard coded
-    float DPIScale=static_cast<float>(GetSystemDpiForProcess(GetCurrentProcess()))/96;
+    OSVERSIONINFO osvi;
+    ZeroMemory(&osvi, sizeof(OSVERSIONINFO));
+    osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
+    GetVersionEx(&osvi);
+    int DPI;
+    if (osvi.dwMajorVersion >= 10 && (osvi.dwMajorVersion > 10 || osvi.dwMinorVersion > 0 || osvi.dwBuildNumber >= 17134))
+        DPI=GetSystemDpiForProcess(GetCurrentProcess());
+    else
+        DPI=GetDeviceCaps(GetDC(NULL), LOGPIXELSX);
+    float DPIScale=static_cast<float>(DPI)/96;
     float ScaledScreenWidth=Screen->Width/DPIScale;
     float ScaledScreenHeight=Screen->Height/DPIScale;
     Width=500;