public static string GetDirectoryViaBrowseDialog(this IVsUIShell2 shell, IntPtr parentWindow, Guid persistenceSlot, string title, string initialDirectory, bool overridePersistedInitialDirectory)
{
if (shell == null)
{
throw new ArgumentNullException("shell");
}
if (title == null)
{
throw new ArgumentNullException("title");
}
const int MaxDirName = 10000;
IntPtr dirNameBuffer = Marshal.AllocCoTaskMem((MaxDirName + 1) * sizeof(char));
try
{
VSBROWSEINFOW[] browse = new VSBROWSEINFOW[]
{
new VSBROWSEINFOW
{
pwzDlgTitle = title,
dwFlags = (uint)BrowseInfoFlags.ReturnOnlyFileSystemDirectories,
hwndOwner = parentWindow,
pwzInitialDir = GetInitialDirectoryToUse(initialDirectory, overridePersistedInitialDirectory, persistenceSlot),
nMaxDirName = MaxDirName,
lStructSize = (uint)Marshal.SizeOf(typeof(VSBROWSEINFOW)),
pwzDirName = dirNameBuffer,
dwHelpTopic = 0
}
};
string helpTopic = string.Empty;
string openButtonLabel = null;
string ceilingDir = null;
VSNSEBROWSEINFOW[] nseBrowseInfo = null;
ErrorHandler.ThrowOnFailure(shell.GetDirectoryViaBrowseDlgEx(browse, helpTopic, openButtonLabel, ceilingDir, nseBrowseInfo));
string folder = Marshal.PtrToStringUni(browse[0].pwzDirName);
if (!string.IsNullOrEmpty(folder))
{
PersistLastUseDirectory(persistenceSlot, folder);
}
return(folder);
}
catch (COMException ex) when(ex.ErrorCode == VSConstants.OLE_E_PROMPTSAVECANCELLED)
{
}
finally
{
if (dirNameBuffer != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(dirNameBuffer);
dirNameBuffer = IntPtr.Zero;
}
}
return(null);
}
public static void Seek(this IStream stream, long dlibMove, STREAM_SEEK dwOrigin, out long plibNewPosition)
{
var plibNewPositionPtr = Marshal.AllocCoTaskMem(8);
try
{
stream.Seek(dlibMove, dwOrigin, plibNewPositionPtr);
plibNewPosition = Marshal.ReadInt64(plibNewPositionPtr, 0);
}
finally
{
Marshal.FreeCoTaskMem(plibNewPositionPtr);
}
}
public static void Write(this IStream stream, byte[] pv, int cb, out int pcbWritten)
{
var pcbWrittenPtr = Marshal.AllocCoTaskMem(4);
try
{
stream.Read(pv, cb, pcbWrittenPtr);
pcbWritten = Marshal.ReadInt32(pcbWrittenPtr);
}
finally
{
Marshal.FreeCoTaskMem(pcbWrittenPtr);
}
}
private IntPtr Alloc() => Marshal.AllocCoTaskMem(BlockSize);