C# aaApi_MonikersToStrings not working PW address to folder

Question

I have a stand alone C# application that performs some things at a folder location. I am updating it to now work for a projectwise folder location. 
 the user hits a search button in the application window which brings up a folder select dialog. after selecting the folder the folder path to placed in a label in the application. 
 
 I was able to up the application to bring up a projectwise select project dialog. I then use the aaApi_GetProjectMonikers and aaApi_MonikersToStrings api calls to take the returned folderID to get the full PW address to the file but I'm having some trouble with the aaApi_MonikersToStrings call. Even though both aaApi_GetProjectMonikers and aaApi_MonikersToStrings return true the out variable in the aaApi_MonikersToStrings stays null. heres the code after getting the folderID 
 //get project moniker
 int[] array = new int[1];
 int[] moniker = new int[1];
 array[0] = MyGlobals.selectedProjID;
 GCHandle handle = GCHandle.Alloc(array, GCHandleType.Pinned);
 GCHandle handle2 = GCHandle.Alloc(moniker, GCHandleType.Pinned);
 try
 {
 StringBuilder[] ProjString = new StringBuilder[1];
 IntPtr pointer = handle.AddrOfPinnedObject();
 IntPtr pointer2 = handle2.AddrOfPinnedObject();
 bool gotProjMoniker = PWWrappers.aaApi_GetProjectMonikers(1, pointer, pointer2);
 uint flags = 0x00000001;
 bool gotProjString = PWWrappers.aaApi_MonikersToStrings(1, pointer2, ProjString, flags);
 //string projString = Marshal.PtrToStringAnsi(Projptr);
 }
 finally
 {
 if (handle.IsAllocated)
 {
 handle.Free();
 }
 if (handle2.IsAllocated)
 {
 handle2.Free();
 }
 PWWrappers.aaApi_Free(null);
 } 
 here are my wrappers 
 [DllImport("c:\Program Files\Bentley\ProjectWise\bin\dmawin.dll", CharSet = CharSet.Unicode)]
 public static extern int aaApi_SelectProjectDlg(IntPtr hWndParent, StringBuilder lpctstrTitle, int lProjectID);
 
 [DllImport("c:\Program Files\Bentley\ProjectWise\bin\dmscli.dll")]
 public static extern bool aaApi_GetProjectMonikers(int lItemCount, IntPtr projectIds, IntPtr pMonikers);
 
 [DllImport("c:\Program Files\Bentley\ProjectWise\bin\dmscli.dll", CharSet = CharSet.Unicode)]
 public static extern bool aaApi_MonikersToStrings(int monikerCount, IntPtr monikers, StringBuilder[] strings, uint flags); 
 
 I must be doing something wrong. Still don't understand why its so hard to get the full path to folder.

Elgin Litke` · Answer

I've never really had a fun time interacting with the moniker functions in C#. I'd suggest using some different functions to achieve the same (though arguably easier and cleaner) results. 
 StringBuilder folderPath = new StringBuilder(1024);
StringBuilder datasource = new StringBuilder(1024);
aaApi_GetProjectNamePath2(folderId, false, '\', folderPath, folderPath.Capacity);
aaApi_GetActiveDatasourceName(datasource, datasource.Capacity);
String pwPath = $@"pw:\{datasource}\Documents\{folderPath}\"; //the path to your folder will be stored here 
 Wrapped functions: 
 [DllImport(@"C:\Program Files\Bentley\ProjectWise\bin\dmscli.dll", CharSet = CharSet.Unicode)]
public static extern bool aaApi_GetActiveDatasourceName(StringBuilder lptstrName, int lNameSize);

[DllImport(@"C:\Program Files\Bentley\ProjectWise\bin\dmscli.dll", CharSet = CharSet.Unicode)]
public static extern bool aaApi_GetProjectNamePath2(int lProjectId, bool bUseDesc, char tchSeparator, StringBuilder lptstrBuffer, int lBufferLen); 
 Hope this helps!