Hi
I am developing an app in which I have used a MSComm object. I have opened
the
port, performed the transactions, and then closed the port.
But when I check in the task mamager, the memory being held by the MSComm is
not being released. I am using the SetPortOpen method.
Is there any way of releasing this memory explicitly.
Regards. 4 3437
I have read somewhere about MSComm control creating an extra copy of data
when GetInput(...) is invoked, and that can be solved by using Attach method
of COleVariant.
COleVariant var = MSComm1.GetInput();
This makes an extra copy of the data and leaves it lying around.
Instead use this...
COleVariant var;
var.Attach (MSComm1.GetInput());
Then you can access the data using SafeArrayAccessData. Don't forget to use
SafeArrayUnaccessData for unlocking...
Cheers
Jagadeesh
"AA" <no*@noreply.com> wrote in message
news:u6**************@TK2MSFTNGP10.phx.gbl... Hi I am developing an app in which I have used a MSComm object. I have opened the port, performed the transactions, and then closed the port. But when I check in the task mamager, the memory being held by the MSComm
is not being released. I am using the SetPortOpen method. Is there any way of releasing this memory explicitly. Regards.
Thanks for your immediate help Jagadeesh.
However, please look at my issue below : This code is from MSDN :
MSComm mlComm;
mlComm.SetCommPort(1);
mlComm.SetInBufferSize(1024);
mlComm.SetOutBufferSize(512);
mlComm.SetSettings("9600,n,8,1");
mlComm.SetInputMode(1);
mlComm.SetRThreshold(0);
mlComm.SetSThreshold(0);
// try catch loop
try
{
m_ctlComm.SetPortOpen(TRUE);
}
catch(CException* e)
{
AfxMessageBox("Open already. Please check!!. ",MB_ICONSTOP);
return FALSE;
}
It is taking around 3.5 MB space, which is not released even after I return
to the main app after closing the port.
Please suggest.
"Jagadeesh VN" <ja*********@hotmail.com> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl... I have read somewhere about MSComm control creating an extra copy of data when GetInput(...) is invoked, and that can be solved by using Attach
method of COleVariant.
COleVariant var = MSComm1.GetInput(); This makes an extra copy of the data and leaves it lying around. Instead use this... COleVariant var; var.Attach (MSComm1.GetInput());
Then you can access the data using SafeArrayAccessData. Don't forget to
use SafeArrayUnaccessData for unlocking...
Cheers Jagadeesh
"AA" <no*@noreply.com> wrote in message news:u6**************@TK2MSFTNGP10.phx.gbl... Hi I am developing an app in which I have used a MSComm object. I have
opened the port, performed the transactions, and then closed the port. But when I check in the task mamager, the memory being held by the
MSComm is not being released. I am using the SetPortOpen method. Is there any way of releasing this memory explicitly. Regards.
I think, its taking some memory for the initialization. Even if you create
another instance of MSComm, then the memory usage wont go up. It happens
only for the first time.
"AAg." <no*@noreply.com> wrote in message
news:uM**************@tk2msftngp13.phx.gbl... Thanks for your immediate help Jagadeesh. However, please look at my issue below : This code is from MSDN : MSComm mlComm;
mlComm.SetCommPort(1);
mlComm.SetInBufferSize(1024);
mlComm.SetOutBufferSize(512);
mlComm.SetSettings("9600,n,8,1");
mlComm.SetInputMode(1);
mlComm.SetRThreshold(0);
mlComm.SetSThreshold(0);
// try catch loop
try
{
m_ctlComm.SetPortOpen(TRUE);
}
catch(CException* e)
{
AfxMessageBox("Open already. Please check!!. ",MB_ICONSTOP);
return FALSE;
}
It is taking around 3.5 MB space, which is not released even after I
return to the main app after closing the port.
Please suggest.
"Jagadeesh VN" <ja*********@hotmail.com> wrote in message news:%2****************@TK2MSFTNGP10.phx.gbl... I have read somewhere about MSComm control creating an extra copy of
data when GetInput(...) is invoked, and that can be solved by using Attach method of COleVariant.
COleVariant var = MSComm1.GetInput(); This makes an extra copy of the data and leaves it lying around. Instead use this... COleVariant var; var.Attach (MSComm1.GetInput());
Then you can access the data using SafeArrayAccessData. Don't forget to use SafeArrayUnaccessData for unlocking...
Cheers Jagadeesh
"AA" <no*@noreply.com> wrote in message news:u6**************@TK2MSFTNGP10.phx.gbl... Hi I am developing an app in which I have used a MSComm object. I have opened the port, performed the transactions, and then closed the port. But when I check in the task mamager, the memory being held by the
MSComm is not being released. I am using the SetPortOpen method. Is there any way of releasing this memory explicitly. Regards.
Hi Jagadeesh
Without the MSComm GetInput also, it is giving the same memory usage.
Can there be any other API or method to explicitly clear this memory?
Regards.
"Jagadeesh VN" <ja*********@hotmail.com> wrote in message
news:u6**************@TK2MSFTNGP11.phx.gbl... I think, its taking some memory for the initialization. Even if you create another instance of MSComm, then the memory usage wont go up. It happens only for the first time.
"AAg." <no*@noreply.com> wrote in message news:uM**************@tk2msftngp13.phx.gbl... Thanks for your immediate help Jagadeesh. However, please look at my issue below : This code is from MSDN : MSComm mlComm;
mlComm.SetCommPort(1);
mlComm.SetInBufferSize(1024);
mlComm.SetOutBufferSize(512);
mlComm.SetSettings("9600,n,8,1");
mlComm.SetInputMode(1);
mlComm.SetRThreshold(0);
mlComm.SetSThreshold(0);
// try catch loop
try
{
m_ctlComm.SetPortOpen(TRUE);
}
catch(CException* e)
{
AfxMessageBox("Open already. Please check!!. ",MB_ICONSTOP);
return FALSE;
}
It is taking around 3.5 MB space, which is not released even after I return to the main app after closing the port.
Please suggest.
"Jagadeesh VN" <ja*********@hotmail.com> wrote in message news:%2****************@TK2MSFTNGP10.phx.gbl... I have read somewhere about MSComm control creating an extra copy of data when GetInput(...) is invoked, and that can be solved by using Attach method of COleVariant.
COleVariant var = MSComm1.GetInput(); This makes an extra copy of the data and leaves it lying around. Instead use this... COleVariant var; var.Attach (MSComm1.GetInput());
Then you can access the data using SafeArrayAccessData. Don't forget
to use SafeArrayUnaccessData for unlocking...
Cheers Jagadeesh
"AA" <no*@noreply.com> wrote in message news:u6**************@TK2MSFTNGP10.phx.gbl... > Hi > I am developing an app in which I have used a MSComm object. I have opened > the > port, performed the transactions, and then closed the port. > But when I check in the task mamager, the memory being held by the MSComm is > not being released. I am using the SetPortOpen method. > Is there any way of releasing this memory explicitly. > Regards. > >
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