Stack Violation 1

[webpager]

The following code gives me an error:-

Stack Violation. Please check the parameters

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SENDMESSAGEa=REGFN("SendMessage","LLL","L&quot

m_user=256
kommand=40045

RETURN_VALUE=CALLFN(SENDMESSAGEa,HWNDWINAMP,m_user,kommand)
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There is a lot more code than this but these are the relevant lines.

There is no mention of Stack Violation in my reference material so could anyone suggest what I am doing wrong.

 

[webpager]

P.S.
HWNDWINAMP is defined as the window handle of the receiving screen.

 

[Walid]

Hi my friend,
First of all you don't have to use FoxTools REGFN(),CALLFN()
To register SendMessage() Win32 API function. You can declare it like this

DECLARE INTEGER SendMessage IN WIN32API ;
   INTEGER hWnd, ;
   INTEGER Msg, ;
   INTEGER wParameter, ;
   INTEGER lParameter

You can find hWnd using

DECLARE INTEGER FindWindow IN Win32API STRING, STRING
hWnd = FindWindow(0,"America Online") && America Online is just an example

Then you have to assign the right number for your message "WM_Message" and send it using

=SendMessage(hWnd, WM_Message, 0, 0)

Finally and most important, the value of your message has to be a Hex number not decimal which I think it was you problem when the compiler thought that 40045 is a Hex number,which if true it needs more than 32 bits to store this number that is why you got stack overflow error. So find the Hex number of your message or its constant and if you got this message parameter value 40045 convert it to 0X9C6D in FoxPro
Thanks and good luck Walid Magd
Engwam@Hotmail.com