在C＃中导入C ++ dll函数

Question

我想在MediaInfo.dll中调用一个函数。

功能是：

const wchar_t*     __stdcall MediaInfo_Option (void* Handle, const
wchar_t* Option, const wchar_t* Value);

我已经用这种方式在c＃代码中声明了它：

[DllImport("MediaInfo.dll", CharSet = CharSet.Unicode)] internal
static extern string MediaInfo_Option(IntPtr Handle, string OptionString, string Value);

这里是它被称为的代码：

MediaInfo.MediaInfo_Open(this.h, path);
MediaInfo.MediaInfo_Option(this.Handle, "Complete", "1");
myTextBox.Text = MediaInfo.MediaInfo_Inform(this.h, 0);
MediaInfo.MediaInfo_Close(this.h);

问题是，在调用该函数时，使用.NET Framework等于或大于版本4编译的任何c＃应用程序都会崩溃。

我该如何解决？

提前致谢。

Answer 1

You did not Marshall the wchar_t* of both input and output, you'll get random errors.

There is a C# binding of MediaInfo which takes care of all the ugly stuff. You can use it with a C# example of MediaInfo.
You may be interested in downloading the DLL package with a C# example project.