fix Windows prompts to insert disk if memory card not present

stepmania/src/ProfileManager.cpp

@@ -131,21 +131,41 @@ bool ProfileManager::IsMemoryCardInserted( PlayerNumber pn )
 	if( sDir.empty() )
 		return false;
 
-	//
+#ifdef _WINDOWS
-	// Test whether a memory card is available by trying to write a file.
+	// Windows will throw up a message box if we try to write to a
-	//
+	// removable drive with no disk inserted.  Find out whether there's a 
-	CString sFile = sDir + "temp";
+	// disk in the drive w/o writing a file.
-	FILE* fp = fopen( sFile, "w" );
+
-	if( fp )
+	// find drive letter
-	{
+	vector<CString> matches;
-		fclose( fp );
+	static Regex parse("^([A-Za-z]+):");
-		remove( sFile );
+	parse.Compare(sDir, matches);
-		return true;
+	if( matches.size() != 1 )
-	}
-	else
 	{
 		return false;
 	}
+	else
+	{
+		CString sDrive = matches[0];
+		TCHAR szVolumeNameBuffer[MAX_PATH];
+		DWORD dwVolumeSerialNumber;
+		DWORD dwMaximumComponentLength;
+		DWORD lpFileSystemFlags;
+		TCHAR szFileSystemNameBuffer[MAX_PATH];
+		BOOL bResult = GetVolumeInformation( 
+			sDrive + ":",
+			szVolumeNameBuffer,
+			sizeof(szVolumeNameBuffer),
+			&dwVolumeSerialNumber,
+			&dwMaximumComponentLength,
+			&lpFileSystemFlags,
+			szFileSystemNameBuffer,
+			sizeof(szFileSystemNameBuffer) );
+		return !!bResult;
+	}
+#endif
+
+	return true;
 }
 
 bool ProfileManager::LoadProfileFromMemoryCard( PlayerNumber pn )
@@ -161,13 +181,13 @@ bool ProfileManager::LoadProfileFromMemoryCard( PlayerNumber pn )
 }
 
 bool ProfileManager::LoadFirstAvailableProfile( PlayerNumber pn )
+{
+	if( IsMemoryCardInserted(pn) )
 	{
 		if( LoadProfileFromMemoryCard(pn) )
 			return true;
 	
 		CString sDir = GetMemCardDir( pn );
-	if( !sDir.empty() )
-	{
 		CreateProfile( sDir, NEW_MEM_CARD_NAME );
 		if( LoadProfileFromMemoryCard(pn) )
 			return true;