Catching message from app in same PC

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Hi,
I need to catching the messaged from another application in same PC.
I use VB6.0 ,please kindly advise some sample to me.
below is the source code from other app.

VB

   // To open job:
IntPtr open_autocompiler = FindWindow("TSSLA", "SSLA");
if (open_autocompiler == IntPtr.Zero)
{
MessageBox.Show("This window cannot open");
return;
}
else
{
SetForegroundWindow(open_autocompiler); //set AutoCompiler to main window
WM_USER+100.wparam("1"); //hint: wparam data is (WORD) type.
}

   // To cancel job:
IntPtr open_autocompiler = FindWindow("TSSLA", "SSLA");
if (open_autocompiler == IntPtr.Zero)
{
MessageBox.Show("This window cannot open");
return;
}
else
{
SetForegroundWindow(open_autocompiler); //set AutoCompiler to main window
WM_USER+100.wparam("2"); //hint: wparam data is (WORD) type.
}

Thanks,
Rod
my email: [Email Removed]

Posted 10-Jun-11 19:51pm

Siripong Buasim

Updated 10-Jun-11 19:56pm

thatraja

v2

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-06-11T13:49:00

This is not easy at all; and there is a part of it which is nearly impossible to achieve in VB6 (probably just impossible). This part requires writing a DLL should be written in C++. There are other options like Object Pascal (Delphi) or any other fully-fledged compiler which can work with raw Windows code and create DLLs. VB6 is not a "real" compiler, so this is not an option.

Capturing message is possible through installing Windows Hooks. You can start from here:
http://msdn.microsoft.com/en-us/library/ms632589(v=vs.85).aspx[^].

Now, according to Microsoft documentation on hooks, capturing messages dispatched to windows of other process requires installation of the hook through the function SetWindowsHookEx (see http://msdn.microsoft.com/en-us/library/ms644990(v=vs.85).aspx[^]) in a DLL. This is where VB6 limitations come into play.

My best advice would be: don't even try it, unless you have pretty serious software development experience on the level of raw Windows API and plenty of perseverance.

—SA