Merge pull request #2965 from WizardCM/windows-help-flag

UI: Show help text for launch parameters on Windows

UI/obs-app.cpp

@@ -2451,26 +2451,31 @@ int main(int argc, char *argv[])
 			opt_allow_opengl = true;
 
 		} else if (arg_is(argv[i], "--help", "-h")) {
-			std::cout
-				<< "--help, -h: Get list of available commands.\n\n"
-				<< "--startstreaming: Automatically start streaming.\n"
-				<< "--startrecording: Automatically start recording.\n"
-				<< "--startreplaybuffer: Start replay buffer.\n"
-				<< "--startvirtualcam: Start virtual camera (if available).\n\n"
-				<< "--collection <string>: Use specific scene collection."
-				<< "\n"
-				<< "--profile <string>: Use specific profile.\n"
-				<< "--scene <string>: Start with specific scene.\n\n"
-				<< "--studio-mode: Enable studio mode.\n"
-				<< "--minimize-to-tray: Minimize to system tray.\n"
-				<< "--portable, -p: Use portable mode.\n"
-				<< "--multi, -m: Don't warn when launching multiple instances.\n\n"
-				<< "--verbose: Make log more verbose.\n"
-				<< "--always-on-top: Start in 'always on top' mode.\n\n"
-				<< "--unfiltered_log: Make log unfiltered.\n\n"
-				<< "--allow-opengl: Allow OpenGL on Windows.\n\n"
-				<< "--version, -V: Get current version.\n";
+			std::string help =
+				"--help, -h: Get list of available commands.\n\n"
+				"--startstreaming: Automatically start streaming.\n"
+				"--startrecording: Automatically start recording.\n"
+				"--startreplaybuffer: Start replay buffer.\n"
+				"--startvirtualcam: Start virtual camera (if available).\n\n"
+				"--collection <string>: Use specific scene collection."
+				"\n"
+				"--profile <string>: Use specific profile.\n"
+				"--scene <string>: Start with specific scene.\n\n"
+				"--studio-mode: Enable studio mode.\n"
+				"--minimize-to-tray: Minimize to system tray.\n"
+				"--portable, -p: Use portable mode.\n"
+				"--multi, -m: Don't warn when launching multiple instances.\n\n"
+				"--verbose: Make log more verbose.\n"
+				"--always-on-top: Start in 'always on top' mode.\n\n"
+				"--unfiltered_log: Make log unfiltered.\n\n";
 
+#ifdef _WIN32
+			MessageBoxA(NULL, help.c_str(), "Help",
+				    MB_OK | MB_ICONASTERISK);
+#else
+			std::cout << help
+				  << "--version, -V: Get current version.\n";
+#endif
 			exit(0);
 
 		} else if (arg_is(argv[i], "--version", "-V")) {