why did a program hang when postmessage(hwnd,wparam,lparam) to dialog in mfc?

Question

0.00/5 (No votes)

See more:

i have a multithread program and when postmessage(hwnd,wparam,lparam) to dialog in mfc,my program hang and when keep a breakpoint my program don't hang.

Posted 21-Feb-10 1:19am

hamidehkarimi

Add a Solution

3 solutions

Solution 1

There is not enough information in your question to tell. You will need to gather clues to try to get closer and pin it down.

As a first step, try running your program under the debugger but without breakpoints (as you say it doesn't exhibit the problem when there is a breakpoint). Then when it hangs, you can break the program from the debugger window And try to see where it is executing. This may give you a clue.

You didn't indicate where you where trying a breakpoint. Have you tried various places in the code that should be processing your posted message?

Have you examined the code that processes your posted message in your UI thread and the code after you post your message in your worker thread for potential thread synchronization issues? Perhaps some sort of race condition?

Posted 21-Feb-10 5:17am

Avi Berger

Solution 2

It's impossible to answer your query with the information you've given.

Is there a handler for the message being posted? If so, what does it do? Have you verified that this method doesn't hang?

Posted 21-Feb-10 5:40am

Rajesh R Subramanian

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

«_Superman_» · Accepted Answer · 2010-02-21T17:30:00

Solution 3

PostMessage does not have the signature that you have mentioned.

It is either
BOOL PostMessage(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);

Or
BOOL PostMessage(UINT message, WPARAM wParam = 0, LPARAM lParam = 0);

Posted 21-Feb-10 17:30pm

«_Superman_»