mpossible strange behaviour with sendmessage (make no sense at all)

[michelqa]

Hi,

I use sendMessage to retrieve information from another application.

For some obscur reasons, my code work only in a button click event and
nowhere else in my application. I mean I get unexpected result
depending where the code is placed in my application ?!?!?!?!?

Here is my code:
=============== =============== ==
//retrieve all line in a win32 multiline textbox
IntPtr
NbOfLines=SendM essage(1050958, EM_GETLINECOUNT ,IntPtr.Zero,In tPtr.Zero);
string CtrlContent="";
// MessageBox.Show ("Uncomment this line and everything work....");
for (int cnt=0;cnt<(int) NbOfLines;cnt++ )
{
StringBuilder textBuffer = new StringBuilder() ;
int NbOfChars=SendM essage(1050958, EM_GETLINE,cnt, textBuffer);
CtrlContent+=te xtBuffer.ToStri ng();
}
MessageBox.Show ("Content="+Ctr lContent);


The preceding code placed in a button click event work
perfectly....bu t the same code in a TreeView afterSelect event is not
working at all, the content is always empty without any reasons...

if I put a messagebox before the loop, everything work
perfectly.....T his is totally weird is anybody can explain what is
going on???

This non logic behaviour is a ***MAJOR PROBLEM*** in my application I
really need to find a way to fix this..

Thanks!