c# - 如何编组二维 TCHAR 数组？

Question

我有一个 DLL 函数，可以将文件转换为另一种格式。该函数产生多个文件作为输出。因此，它用输出文件的路径填充第二个参数。

C++ 函数定义如下：

int Convert(LPTSTR lpSource, TCHAR outputFileName[][MAX_PATH]);

如何混搭第二个参数，以便我的 C# 应用程序可以正确接收输出文件路径？

[DllImport("Convert.dll")]
private static extern int Convert(
  [MarshalAs(UnmanagedType.LPTStr)] string lpszSource,
  ????
);

提前致谢。

Answer 1

I would make things simpler using C++/CLI (which is very good at building bridging layers between native C/C++ code and managed code).

Basically, you could write a thin C++/CLI layer that exposes a method that calls the native function in its body, and then copies the returned native strings into a gcnew-ly created array<String^>, and returns it to the C# managed caller.

Answer 2

我终于弄明白了。我将 C++ 函数更改为以下内容：

int Convert(LPTSTR lpSource, LPTSTR *plpOutputFileName, int size);

C# 声明为：

[DllImport("Convert.dll")]
private static extern int Convert(
    [MarshalAs(UnmanagedType.LPTStr)] string lpszSource,
    [In, Out] String[] outputFileName,
    int size
);

谢谢大家的帮助。