Go Premium for a chance to win a PS4. Enter to Win

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 1836
  • Last Modified:

GetMessage() in MFC console app

Hi all,
I have an MFC console application, with main declared as follows:
int _tmain(int argc, _TCHAR* argv[])

Can I receive windows standard messages, key up/down etc.?
If I call GetMessage() it never returns (unless I send a message myself with PostThreadMessage), nothing even gets printed on the screen when I type - the thread is blocked, just waiting.

Any help is appreciated.
0
darrgyas
Asked:
darrgyas
  • 4
  • 3
  • 2
  • +1
1 Solution
 
jkrCommented:
Well, what are you trying to achieve?
0
 
darrgyasAuthor Commented:
I need to shut the application down from a different thread, and I also need to have an option for the user to type, let's say, 'quit', push enter and exit that way.
0
 
Anthony2000Commented:
GetMessage does block if there are not messages in the thread's msg queue. You could call PeekMessage and poll the msg queue. When you say a thread is going to send the message, it the thread owned by the same process?
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
pgnatyukCommented:
>> I need to shut the application down from a different thread, and I also need to have an option for the user to type, let's say, 'quit', push enter and exit that way

So you don't need GetMessage in this console application. Make a code that will wait for the user input and parse it. If it will be the command you want to handle, you will send a message to another process, for example, WM_CLOSE. You can SendMessage, emulate keyboard, ... from this console application.
0
 
darrgyasAuthor Commented:
>>>> When you say a thread is going to send the message, it the thread owned by the same process?
Yes

>>>> o you don't need GetMessage in this console application. Make a code that will wait for the user input and parse it
getc() blocks, the only option that it leaves me is send keys from another thread - that is not reliable
0
 
pgnatyukCommented:
So, maybe, the console application was not a good choice?
Simple MFC dialog with few button, an editbox as a console if needed,... - it's not a lot of work.
0
 
Anthony2000Commented:
You could also just create an MFC dialog (with the window starting up hidden) like pgnatyuk suggested, then you could post a WM_CLOSE to the main window from your other thread.
0
 
Anthony2000Commented:
Any reason why the app needs to be a console app?
0
 
darrgyasAuthor Commented:
>>>> Any reason why the app needs to be a console app?
Yes, and it's a good one - but this is outside of the scope of my question.

Maybe it's not possible?
How would you send keys to the main thread in the console app from another thread? Maybe I'm doing it wrong?
0
 
jkrCommented:
What about sending a CTRL_C_EVENT to ypour console handler to terminate?
#include <windows.h> 
#include <stdio.h> 
 
BOOL CtrlHandler( DWORD fdwCtrlType ) 
{ 
  switch( fdwCtrlType ) 
  { 
    // Handle the CTRL-C signal. 
    case CTRL_C_EVENT: 
      printf( "Ctrl-C event, exiting\n\n" );
      ExitProcess(0);
      return( TRUE );
 
    default: 
      return FALSE; 
  } 
} 
 
void main( void ) 
{ 
  if( SetConsoleCtrlHandler( (PHANDLER_ROUTINE) CtrlHandler, TRUE ) ) 
  { 
    printf( "\nThe Control Handler is installed.\n" ); 
 
    while( 1 ){ } 
  } 
  else 
    printf( "\nERROR: Could not set control handler"); 
}


// other thread:

  GenerateConsoleCtrlEvent(CTRL_C_EVENT,0);

Open in new window

0
 
darrgyasAuthor Commented:
>>>> jkr
Gives me a first-time exception, but it works. Not quite what I was looking for, but it is a legitimate solution.
Thank you - helpful as always.
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

  • 4
  • 3
  • 2
  • +1
Tackle projects and never again get stuck behind a technical roadblock.
Join Now