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Communicating between programs

Posted on 2003-03-12
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Last Modified: 2010-04-17
I have written a program in Visual c++.  I wanted the program to only be able to run once.(if the desktop icon was clicked while it was running it was just restored)  I did this by:

...::OnInitInstance
{
     HWND AlreadyThere = FindWindow(NULL,"My Main Windows Name")
     If(AlreadyThere != 0)
     {
          ShowWindow(AlreadyThere, SW_RESTORE);
          return 0;
     }          

But now I want to take it a step further.  Instead of calling a ShowWindow(AlreadyThere, SW_RESTORE); I want to send a Message to AlreadyThere so I can Have my Program do some extra stuff when it was restored by way of double clicking the desktop icon

Any help
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Question by:MightyK
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2 Comments
 
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Accepted Solution

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Nosfedra earned 80 total points
ID: 8120015
You can send a custom message to your function.
define your own message with

#define WM_DO_COOL_TRICKS WM_USER + 100

And when you find there is an instance of your program already running (by the way, you might want to take a look at MSDN - WinMain; look at hPrevInstance paramete, you'll find there how you find out if an instance of your program is already running) you just do a
SendMessage(your_Wnd_handle,WM_DO_COOL_TRICKS,0,0), if you won't pass any params in WParam and LPARAM and then, in the window receiving the message, treat the message in the big case structure of your window callback function.
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by:CleanupPing
ID: 9447192
MightyK:
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