Debug and Release build

[Vivek]

Hi,
I am working on win2000 and VC6.0
I am using user defined messages WM_USER + X (in dialog base application)
Now problem is that to invoke my messages I am using SendMessage and
PostMessage functions.
It works fine when I am working in Debug built.
But when I shift to Release built it works only once i.e.
it gives me error : the instruction at "0x00426b1c" referenced memory at
"0x0000046c". The memory could not be "read".
and I have to restart the application.

But this does not happen in Debug mode I can invoke userdefined messages
many times without error.

Why this is happening or am I missing any logic of user defined messages.

Your reply is highly appriciated.
Thanx in advance

Vivek

[Frank Kaehler]

Hi Vivek,

I think you have "found" an old problem (debug <-> release).

Your message-functions must return a value!

e.g.
//the define
#define MY_MESSAGE WM_USER + 1

//the message handler for MFC
//not required with WIN-API
ON_MESSAGE(MY_MESSAGE, myMessageFunc)

//the function (for WIN-API)
LRESULT myMessageFunc(WPARAM wp, LPARAM lp)
{
//do something
return 0;
}

//the function (for MFC)
LRESULT MyClass::myMessageFunc(WPARAM wp, LPARAM lp)
{
//do something
return 0;
}

HTH
Frank

[Vivek]

Hi Frank,

Thanx for your reply but I am already using the same format.
my function prototype is:
#define UWM_SOLVERSA_SOFTWARES (WM_USER +5)

afx_msg LRESULT OnSolversaSoftware();
LRESULT CFirstTestDlg::OnSolversaSoftware()
{
if((m_btnCheckSI.GetState() && 0x0003)==1)
{
OnButtonsoftcheck();
}
else
{
SendMessage(UWM_SOLVERSA_SHARED,0,0);
}
return 0;

}
what else can be the reason?

Vivek

"Frank Kaehler" <AAAfktoz...@gmx.net> wrote in message
news:2gtl6dF...@uni-berlin.de...

[Vivek]

Hi Frank,

Thanx alot
What u said is correct....
I was not using WPARAM wp, LPARAM lp
Now its working fine...
Once again thank you veru much....
Vivek.

"Vivek" <vivek.ku...@solversa.com> wrote in message
news:eTWZP3JP...@TK2MSFTNGP09.phx.gbl...

[Joseph M. Newcomer]

You have made the classic error. You forgot to read the documentation. The documentation
says the only acceptable prototype for a user-defined message handler is
LRESULT name(WPARAM, LPARAM);
if you used anything else, you are wrong, and the manifestation is that your app crashes
in the way you describe.
joe

Joseph M. Newcomer [MVP]
email: newc...@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm