trouble using delegate in WndProc

[shengmin.ruan]

when i use delegate like this:
-----------------
[System.Security .Permissions.Pe rmissionSet(Sys tem.Security.Pe rmissions.Secur ityAction.Deman d,
Name = "FullTrust" )]
protected override void WndProc(ref Message m)
{

delegate_ReplyF romDataProcess = new
PrepareDelegate _ReplyFromDataP rocess(ReplyFro mDataProcess);
delegate_ReplyF romDataProcess. BeginInvoke(m, null, null);

}

delegate void PrepareDelegate _ReplyFromDataP rocess(Message m);
private void ReplyFromDataPr ocess(Message m)
{
IntPtr pnt = dp.OnReply(UInt 32.Parse(m.WPar am.ToString()),
Int32.Parse(m.L Param.ToString( )));
}

-----------------

i met the error:
*********

{"Attempted to read or write protected memory. This is often an
indication that other memory is corrupt."}

*********
but if i changed the code like this:

--------------
[System.Security .Permissions.Pe rmissionSet(Sys tem.Security.Pe rmissions.Secur ityAction.Deman d,
Name = "FullTrust" )]
protected override void WndProc(ref Message m)
{
IntPtr pnt = dp.OnReply(UInt 32.Parse(m.WPar am.ToString()),
Int32.Parse(m.L Param.ToString( )));
}
--------------

everything is ok,so why and how i can handle this,thanks

[Larry Lard]

sh***********@g mail.com wrote:

when i use delegate like this:

-----------------
[System.Security .Permissions.Pe rmissionSet(Sys tem.Security.Pe rmissions.Secur ityAction.Deman d,
Name = "FullTrust" )]
protected override void WndProc(ref Message m)
{
delegate_ReplyF romDataProcess = new
PrepareDelegate _ReplyFromDataP rocess(ReplyFro mDataProcess);
delegate_ReplyF romDataProcess. BeginInvoke(m, null, null);
}

delegate void PrepareDelegate _ReplyFromDataP rocess(Message m);
private void ReplyFromDataPr ocess(Message m)
{
IntPtr pnt = dp.OnReply(UInt 32.Parse(m.WPar am.ToString()),
Int32.Parse(m.L Param.ToString( )));
}

-----------------

i met the error:
*********

{"Attempted to read or write protected memory. This is often an
indication that other memory is corrupt."}

*********
but if i changed the code like this:

--------------
[System.Security .Permissions.Pe rmissionSet(Sys tem.Security.Pe rmissions.Secur ityAction.Deman d,
Name = "FullTrust" )]
protected override void WndProc(ref Message m)
{
IntPtr pnt = dp.OnReply(UInt 32.Parse(m.WPar am.ToString()),
Int32.Parse(m.L Param.ToString( )));
}
--------------

everything is ok,so why and how i can handle this,thanks

I think the problem is that Delegate.BeginI nvoke causes the called
method to run on a different thread, and it looks like you can't get at
the Message across a thread boundary. You might try changing the
delegate signature to use the *members* of Message, and explicitly pass
those, so that the delegate doesn't have to access the Message itself.
ie instead of taking (Message m), the delegate takes (IntPtr LParam,
Int32 Msg, IntPtr WParam). Might work.

--
Larry Lard
Replies to group please

[shengmin.ruan]

hi,
i've tried the way you said ,but the error is the same

------

delegate void PrepareDelegate _ReplyFromDataP rocess(UInt32 wParam, Int32
lParam);
private void ReplyFromDataPr ocess(UInt32 wParam, Int32 lParam)
{
}

-----

[System.Security .Permissions.Pe rmissionSet(Sys tem.Security.Pe rmissions.Secur ityAction.Deman d,
Name = "FullTrust" )]
protected override void WndProc(ref Message m)
{
delegate_ReplyF romDataProcess = new
PrepareDelegate _ReplyFromDataP rocess(ReplyFro mDataProcess);

delegate_ReplyF romDataProcess. BeginInvoke(UIn t32.Parse(m.WPa ram.ToString()) ,
Int32.Parse(m.L Param.ToString( )), null, null);

base.WndProc(re f m);

}
-----------

can u handle this,thanks

Larry Lard wrote:

sh***********@g mail.com wrote:

when i use delegate like this:

-----------------
[System.Security .Permissions.Pe rmissionSet(Sys tem.Security.Pe rmissions.Secur ityAction.Deman d,
Name = "FullTrust" )]
protected override void WndProc(ref Message m)
{
delegate_ReplyF romDataProcess = new
PrepareDelegate _ReplyFromDataP rocess(ReplyFro mDataProcess);
delegate_ReplyF romDataProcess. BeginInvoke(m, null, null);
}

delegate void PrepareDelegate _ReplyFromDataP rocess(Message m);
private void ReplyFromDataPr ocess(Message m)
{
IntPtr pnt = dp.OnReply(UInt 32.Parse(m.WPar am.ToString()),
Int32.Parse(m.L Param.ToString( )));
}

-----------------

i met the error:
*********

{"Attempted to read or write protected memory. This is often an
indication that other memory is corrupt."}

*********
but if i changed the code like this:

--------------
[System.Security .Permissions.Pe rmissionSet(Sys tem.Security.Pe rmissions.Secur ityAction.Deman d,
Name = "FullTrust" )]
protected override void WndProc(ref Message m)
{
IntPtr pnt = dp.OnReply(UInt 32.Parse(m.WPar am.ToString()),
Int32.Parse(m.L Param.ToString( )));
}
--------------

everything is ok,so why and how i can handle this,thanks

I think the problem is that Delegate.BeginI nvoke causes the called
method to run on a different thread, and it looks like you can't get at
the Message across a thread boundary. You might try changing the
delegate signature to use the *members* of Message, and explicitly pass
those, so that the delegate doesn't have to access the Message itself.
ie instead of taking (Message m), the delegate takes (IntPtr LParam,
Int32 Msg, IntPtr WParam). Might work.

--
Larry Lard
Replies to group please