Returning variables in a plugin

[flaminghairball]

Hey guys,

I’ve got this custom plugin I’m writing, and I’ve run into a bit of a snag.

//Plugin.m
const char* _TagForSource(const char *sender, const char *key){
	return "Hello!";
}

//PluginHandler.cs
[DllImport("__Internal")]
private static extern string _TagForSource(string sender, string key);

public static string TagForSource(string sender, string key){
	return _TagForSource(sender, key);
}

The problem I’m running into is that my app crashes whenever I call TagForSource, due to a malloc error(pointer was freed that wasn’t malloc’d). Hardcoding the TagForSource in the PluginHandler to return a string doesn’t throw an error, so I know that the problem is in Plugin.m - I just have no idea where I’m going wrong. What gives?

[boat365]

You should set the return type of your imported function to System.IntPtr instead of string, then return Marshal.PtrToStringAnsi(_TagForSource(sender, key)) from your TagForSource method.

edit: and here’s the reason why- Redirecting…