opening many docs in singleton app

[coolshashi]

Hi


Hi i want to open many doc files from explorer in a singleton application. I have a singleton application that is working fine(singleton is achieved using mutex). But i want to send message to that existing application when ever user tries to open many other files from the windows explorer with the file name that comes in the command line. How can i communicate bet'n processes using shared memory?? I tried using GlobalAlloc and sending the message. But it did not work.

Any help is greately appreciated

Shashi

[Roger Allen]

I have done this in an app here. Instead of a mutex I used a mapped memory file that can be used between instances. When a new instance starts up, it trys to open the mapped memory file. If it doesn't exist, it creates it as its the first instance, it then populates it with the HWND of the CMainFrame window. This mapped memory file is a structure somehting like:

struct {
HWND window ;
char commandline[MAX_PATH] ;
}

If it already existed, the new instance populates the commandLine variable in the memory mapped file and uses the HWND to send a user defines message to the other app. No parameters are passed as these are in the memory mapped file. You other instance, gets the message, read the command line from the MMF and then acts accordingly.

Take a look at CreateFileMapping