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Damaged heap when calling an unmanaged function through DllImport

I am using an unmanaged dll that is written in C / C ++ from a C # application. I am interested in using the following function from dll:

    static void StorePath(const std::string& path, wchar_t *out_path,
     int *out_path_length){
      wcslcpy(out_path, c_str_w(path), *out_path_length);
      *out_path_length = path.size();
     }

    int WINAPI BrowseForDirectory(
     int allow_portable, int allow_online,
      wchar_t *t_directory, int *e_directory_length,
       wchar_t *m_directory, int *m_directory_length){
     .
     .
     . //initializing new forms and checking product keys

    StorePath(form->SelectedEDirectory().TopDir(), e_directory,
     e_directory_length);
    StorePath(form->SelectedMDirectory(), m_directory,
     m_directory_length);
    }

Header file:

    #if defined(_WIN32) && !BUILD_WITHOUT_DLLS &&!defined(ECLIPSE_CBUILDER_WORKAROUNDS)
    # if BUILDING_EXPORT_LIBRARY
    #  define EXPORT_DLL __declspec(dllexport)
    # else
    #  define EXPORT_DLL __declspec(dllimport)
    # endif
    #else
    #  define EXPORT_DLL
    #endif

    extern "C" {
        int WINAPI BrowseForDirectory(
         int allow_portable, int allow_online,
          wchar_t *t_directory, int *e_directory_length,
           wchar_t *m_directory, int *m_directory_length)
    }

Then I try to call this function in my own C # managed class library by doing the following:

    [DllImport("MyDLL.dll", CharSet = CharSet.Ansi)]
    public static extern int BrowseForDirectory(Int32 allowOnline, 
     Int32 allowPortable,
      [MarshalAs(UnmanagedType.LPStr)] StringBuilder eDirectory, 
       ref Int32 eDirLength, 
        [MarshalAs(UnmanagedType.LPStr)] StringBuilder mDirectory, 
         ref Int32 mDirLength);

Finally, I try to use it in a C # application, calling it the following:

    var eDir = new StringBuilder(260);
    var mDir = new StringBuilder(260);
    var eDirLength = eDir.Length;
    var mDirLength = mDir.Length;
    try
    {
        var result = Viewer.BrowseForDirectory(1, 1, eDir, 
         ref eDirLength, mDir, ref mDirLength);
    }
    catch(Exception ex)
    {
        MessageBox.Show(ex.ToString());
    }

However, I was getting heap damage, but now my application exits due to STATUS_STACK_BUFFER_OVERRUN - something about the built-in breakpoint. Changing code in C ++ is not an option. I have the correct link and assembly.

What am I doing wrong?

+4
1

, , , . UTF-16, p ​​/invoke ANSI . p/invoke :

[DllImport("MyDLL.dll", CharSet = CharSet.Unicode)]
public static extern int BrowseForDirectory(
    int allowOnline, 
    int allowPortable,
    StringBuilder eDirectory, 
    ref int eDirLength, 
    StringBuilder mDirectory, 
    ref int mDirLength
);

, c_str_w() 8- wchar_t.

+1

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