Can't exec() a program that uses mem alloc?

I am trying tooth and nail to create a method of copying a string of text to the server's clipboard via php. I have found a couple of short pieces of code to do exactly that in C, so compiled the program and in a command prompt it works like a charm - in my case it reads the contents of a text file and copies that to the clipboard. I then try using a php script to execute that file using shell_exec(), exec() and system() to no luck, every time the command: $outpt = shell_exec("clipboard.exe") or die ("failed to execute");Would just print out the die message. I set about writing my own C program to copy the contents of the text file first to the screen, and then to a char array which could then be passed to the clipboard. All of these self made programs could be executed by shell_exec() - so I thought I was finally onto a winner. However it seems that I can't just pass a char array to SetClipboardData - it has to be a block of Globally Movable memory, which sadly I don't understand. Is there any reason why PHP shell_exec() or other execution commands are unable to run a program that tampers with memory? I can't say I understand.. The other question would be - how could I modify either of the exe files to work with PHP? Thankyou for your time and knowledge :) clipper.php <-- php code for shell_exec commands. change which line is commented to test the second method clipboard.cpp <-- clipboard executable found from google, works in command prompt but 'fails to execute' with PHP clipper.cpp <-- clipboard executable I wrote, which doesn't actually work, but can be executed with PHP