I have a windows application that is accessing unmanaged
code and providing a callback function that will create
events at unknown time spans. When the EventHandler
(callback function) fires it causes my program to crash or
freeze, or do strange stuff. When I remove this callback
function it works great. Problem is I need this callback
function to implement my state machine for the program so
I think I need to encapsulate this callback function into
its own process, but it takes 4 parameters. I have looked
all over the web, but cannot find a good example of this
implementation can anyone point me in a good direction?
3  2045 
Jim,
What is the mechanism that you are passing? Are you passing a COM
interface pointer, or are you passing a function pointer (which is marshaled
from a delegate into unmanaged code)? Each way has its own considerations,
but both are certainly doable.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Jim" <je******@natio nsfirstcorp.com > wrote in message
news:02******** *************** *****@phx.gbl.. . I have a windows application that is accessing unmanaged
code and providing a callback function that will create
events at unknown time spans. When the EventHandler
(callback function) fires it causes my program to crash or
freeze, or do strange stuff. When I remove this callback
function it works great. Problem is I need this callback
function to implement my state machine for the program so
I think I need to encapsulate this callback function into
its own process, but it takes 4 parameters. I have looked
all over the web, but cannot find a good example of this
implementation can anyone point me in a good direction?
I am sending a fucntion pointer. here is my Event Handler
Method. What is happening, is some how when my
eventhandler is fired it will lock up my program. I think
there is some memory issues here and I can't figure it
out.
unsafe public void EventHandler (void* vpUserData, uint
uiEvent, uint uiParam0, uint uiParam1)
{
EvQ[iQIn].uiUserData = (uint)vpUserDat a;
EvQ[iQIn].uiEvent = uiEvent;
EvQ[iQIn].uiParam0 = uiParam0;
EvQ[iQIn].uiParam1 = uiParam1;
richTextBox1.Ap pendText("\r\nE vent Handler " +
iQIn.ToString() );
richTextBox1.Ap pendText("\r\nE vent : " + uiEvent.ToStrin g
());
iQIn ++;
if(iQIn == 200) //Queue at max compacity
{
iQIn = 0; //Reset to 0
}
if(uiEvent == 215)
{
if(uiParam0== TONE_DIALTONE)
{
richTextBox1.Ap pendText("\r\n WE HAVE DIALTONE \r\n");
}
if(uiParam0 == TONE_RINGBACK)
{
richTextBox1.Ap pendText("\r\n WE HAVE RINGBACK \r\n");
}
if(uiParam0 == TONE_BUSY)
{
richTextBox1.Ap pendText("\r\n WE HAVE BUSY \r\n");
}
}
} -----Original Message-----
Jim,
What is the mechanism that you are passing? Are you
passing a COMinterface pointer, or are you passing a function pointer
(which is marshaledfrom a delegate into unmanaged code)? Each way has its
own considerations,but both are certainly doable.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Jim" <je******@natio nsfirstcorp.com > wrote in message
news:02******* *************** ******@phx.gbl. .. I have a windows application that is accessing unmanaged
code and providing a callback function that will create
events at unknown time spans. When the EventHandler
(callback function) fires it causes my program to crash
or freeze, or do strange stuff. When I remove this
callback function it works great. Problem is I need this
callback function to implement my state machine for the program
so I think I need to encapsulate this callback function
into its own process, but it takes 4 parameters. I have
looked all over the web, but cannot find a good example of this
implementation can anyone point me in a good direction?
.
I'll bet that your callback is being called on a thread other then the UI
thread. I think you should be using this.Invoke on any calls to your UI
controls.
Jeffrey
"Jim" <je******@natio nsfirstcorp.com > wrote in message
news:f5******** *************** *****@phx.gbl.. . I am sending a fucntion pointer. here is my Event Handler
Method. What is happening, is some how when my
eventhandler is fired it will lock up my program. I think
there is some memory issues here and I can't figure it
out.
unsafe public void EventHandler (void* vpUserData, uint
uiEvent, uint uiParam0, uint uiParam1)
{
EvQ[iQIn].uiUserData = (uint)vpUserDat a;
EvQ[iQIn].uiEvent = uiEvent;
EvQ[iQIn].uiParam0 = uiParam0;
EvQ[iQIn].uiParam1 = uiParam1;
richTextBox1.Ap pendText("\r\nE vent Handler " +
iQIn.ToString() );
richTextBox1.Ap pendText("\r\nE vent : " + uiEvent.ToStrin g
());
iQIn ++;
if(iQIn == 200) //Queue at max compacity
{
iQIn = 0; //Reset to 0
}
if(uiEvent == 215)
{
if(uiParam0== TONE_DIALTONE)
{
richTextBox1.Ap pendText("\r\n WE HAVE DIALTONE \r\n");
}
if(uiParam0 == TONE_RINGBACK)
{
richTextBox1.Ap pendText("\r\n WE HAVE RINGBACK \r\n");
}
if(uiParam0 == TONE_BUSY)
{
richTextBox1.Ap pendText("\r\n WE HAVE BUSY \r\n");
}
}
}
-----Original Message-----
Jim,
What is the mechanism that you are passing? Are you
passing a COMinterface pointer, or are you passing a function pointer
(which is marshaledfrom a delegate into unmanaged code)? Each way has its
own considerations,but both are certainly doable.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Jim" <je******@natio nsfirstcorp.com > wrote in message
news:02******* *************** ******@phx.gbl. .. I have a windows application that is accessing unmanaged
code and providing a callback function that will create
events at unknown time spans. When the EventHandler
(callback function) fires it causes my program to crash or freeze, or do strange stuff. When I remove this callback function it works great. Problem is I need this callback function to implement my state machine for the program so I think I need to encapsulate this callback function into its own process, but it takes 4 parameters. I have looked all over the web, but cannot find a good example of this
implementation can anyone point me in a good direction?
. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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