🚀 go-pugleaf

As I read it you are doing this:

Program A
  fills a buffer with data
  sends a message to Program B with the address of the data

Doing it that way is documented to have a problem.  The programs under 
Windows use virtual memory, and the numeric value of an address is 
unique to the program using it so will not be valid if another program 
uses it.

A method provided for doing what you describe is to use the 
WM_COPYDATA message.  Upon seeing that message Windows arranges for 
the receiver to be given an address in its virtual memory space which 
points a data area containing what you sent.

Look up the message WM_COPYDATA in the Windows help and I think your 
problem will be solved.

.  Ed

> Ray wrote in message
> news:4173ab7d@newsgroups.borland.com...
> Hi
>
> I am trying to send data between two applications using windows 
> messages. For the purposes of testing I have
>
> In the sender application (launched by the receiver with Handles and 
> msg values sent in the command line) I have
>
>   static unsigned short tempbuffer[200];
>
>   memcpy(&tempbuffer, buffptr,100*sizeof(short)); //buffptr points 
> to the source data
>
>   Debug<<*tempbuffer<<" "<<*(tempbuffer+1)<<" "
> <<*(tempbuffer+2)<<endl;
>
>   SendMessage(myHandle,mymsg,0,(LPARAM)&tempbuffer);
>
> I check on the first three data values with the Debug file
>
> In the receiver I have a response table which invokes
>
>   LRESULT CmBufferDone(WPARAM ident,LPARAM buff)
>
>   {
>
>   static unsigned short tempbuffer[200];
>
>   memcpy(&tempbuffer, (unsigned short*)&buff,100*
> sizeof(short));
>
>   Debug<<*tempbuffer<<" "<<*(tempbuffer+1)<<" "
> <<*(tempbuffer+2)<<endl;
>
>   }
>
> When I run the two aplications, I get columns of 3672 74 64292 in 
> the receiver, whereas I am sending 2048 2047 2048. Where am I going 
> wrong?