internal static string GetString<T>(T handle, GetStringFunc<T> func, bool nullable = false)
{
IntPtr val = IntPtr.Zero;
try
{
func(handle, out val).ThrowIfError("Failed to get value");
if (val == IntPtr.Zero)
{
return nullable ? null : string.Empty;
}
return Marshal.PtrToStringAnsi(val);
}
finally
{
Interop.Libc.Free(val);
}
}
private static void GetStringArrayFromNative(out string[] stringArray, GetStringFunc callback)
{
int arraySize = 0;
arraySize = callback(null, maxLen, arraySize);
if (arraySize > 0)
{
string[] devices = new string[arraySize];
for (int i = 0; i < arraySize; i++)
{
devices[i] = new StringBuilder().Append('c', maxLen).ToString();
}
callback(devices, maxLen, arraySize);
stringArray = new string[arraySize];
for (int i = 0; i < arraySize; i++)
{
stringArray[i] = devices[i].ToString();
}
}
else
{
stringArray = new string[0];
}
}