Fixed heap corruption in string retrievement, also avoid runtime error if string doesnt fit buffer

OSC2AHK/dllmain.cpp

@@ -156,7 +156,10 @@ DLLEXPORT char* getStringData(char* targetString, unsigned int targetSize, unsig
     {
         if (storedStrings[i].id == stringId)
         {
-            strcpy_s(targetString, targetSize, storedStrings[i].string.c_str());
+            if (storedStrings[i].string.length() < targetSize) //Avoid runtime error. 
+                strcpy_s(targetString, targetSize, storedStrings[i].string.c_str());
+            else
+                strcpy_s(targetString, targetSize, "\0"); //String doesnt fit, return empty string"
             storedStrings.erase(storedStrings.begin() + i);
             return targetString;
         }

msgtest.ahk

@@ -48,7 +48,7 @@ msghandlerString(wParam, lParam, msg, hwnd) {
     stdout.Write("msghandlerString: ")
 
     VarSetCapacity(theStr, 20)
-    theStr := DllCall("OSC2AHK.dll\getStringData", AStr, theStr, UInt, 20, UInt, lParam, "Cdecl AStr")
+    theStr := DllCall("OSC2AHK.dll\getStringData", str, theStr, UInt, 20, UInt, lParam, AStr)
 
     stdout.WriteLine(theStr)
     stdout.Close()