private void OpenStream(IStorage parentStorage, ref FileAccess access)
{
ShellAPI.STGM grfmode = ShellAPI.STGM.SHARE_DENY_WRITE;
switch (access)
{
case FileAccess.ReadWrite:
grfmode |= ShellAPI.STGM.READWRITE;
break;
case FileAccess.Write:
grfmode |= ShellAPI.STGM.WRITE;
break;
}
if (parentStorage != null)
{
if (parentStorage.OpenStream(
shellItem.Text + (shellItem.IsLink ? ".lnk" : string.Empty),
IntPtr.Zero,
grfmode,
0,
out streamPtr) == ShellAPI.S_OK)
{
stream = (IStream)Marshal.GetTypedObjectForIUnknown(streamPtr, typeof(IStream));
}
else if (access != FileAccess.Read)
{
if (parentStorage.OpenStream(
shellItem.Text + (shellItem.IsLink ? ".lnk" : string.Empty),
IntPtr.Zero,
ShellAPI.STGM.SHARE_DENY_WRITE,
0,
out streamPtr) == ShellAPI.S_OK)
{
access = FileAccess.Read;
stream = (IStream)Marshal.GetTypedObjectForIUnknown(streamPtr, typeof(IStream));
}
else
{
throw new IOException(String.Format("Can't open stream: {0}", shellItem));
}
}
else
{
throw new IOException(String.Format("Can't open stream: {0}", shellItem));
}
}
else
{
access = FileAccess.Read;
if (!ShellHelper.GetIStream(shellItem, out streamPtr, out stream))
{
throw new IOException(String.Format("Can't open stream: {0}", shellItem));
}
}
}
public int OpenStorage(string pwcsName, IStorage pstgPriority, ShellAPI.STGM grfMode, IntPtr snbExclude, int reserved, out IntPtr ppstg)
{
return(_iStorage.OpenStorage(pwcsName, pstgPriority, grfMode, snbExclude, reserved, out ppstg));
}
public int CreateStorage(string pwcsName, ShellAPI.STGM grfMode, int reserved1, int reserved2, out IntPtr ppstg)
{
return(_iStorage.CreateStorage(pwcsName, grfMode, reserved1, reserved2, out ppstg));
}
public int OpenStream(string pwcsName, IntPtr reserved1, ShellAPI.STGM grfMode, int reserved2, out IntPtr ppstm)
{
return(_iStorage.OpenStream(pwcsName, reserved1, grfMode, reserved2, out ppstm));
}
/// <summary>
/// Open a file stream, used by FileStreamEx
/// </summary>
internal static void openStream(IStorage parentStorage, string filename, ref FileMode mode, ref FileAccess access, out IntPtr streamPtr, out IStream stream)
{
ShellAPI.STGM grfmode = ShellAPI.STGM.SHARE_DENY_WRITE;
switch (access)
{
case FileAccess.ReadWrite:
grfmode |= ShellAPI.STGM.READWRITE;
break;
case FileAccess.Write:
grfmode |= ShellAPI.STGM.WRITE;
break;
}
switch (mode)
{
case FileMode.Create:
if (FileEx.Exists(filename))
{
grfmode |= ShellAPI.STGM.CREATE;
}
break;
case FileMode.CreateNew:
grfmode |= ShellAPI.STGM.CREATE;
break;
}
if (parentStorage != null)
{
if (parentStorage.OpenStream(
filename,
IntPtr.Zero,
grfmode,
0,
out streamPtr) == ShellAPI.S_OK)
{
stream = (IStream)Marshal.GetTypedObjectForIUnknown(streamPtr, typeof(IStream));
}
else if (access != FileAccess.Read)
{
//Create file if not exists
if (parentStorage.CreateStream(
filename, ShellAPI.STGM.WRITE, 0, 0, out streamPtr) == ShellAPI.S_OK)
{
stream = (IStream)Marshal.GetTypedObjectForIUnknown(streamPtr, typeof(IStream));
}
else
{
throw new IOException(String.Format("Can't open stream: {0}", filename));
}
}
else
{
throw new IOException(String.Format("Can't open stream: {0}", filename));
}
}
else
{
throw new IOException(String.Format("Can't open stream: {0}", filename));
}
}
