问题
I'm creating a (C#) program that downloads binaries using NZB files, there may only be one instance of my application running at any time.
So when a user doubleclicks an .nzb-file and my program is not running, it should start and process it (easy, file registration). Now if my program is already running, I do NOT want to launch a second instance - I want the already-running instance to pick up the specified file.
Making my app single-instance can be done using the Visual Basic DLL with the .IsSingleInstance trick, but I don't want to go there.
The right way seems to be to use a mutex to ensure my app is single-instance, but now I'm stuck on how to pass the specified parameter (the .nzb file) to the already-running instance.
Help would be appreciated ! :-)
回答1:
Try this: Your main program creates a named pipe or other interprocess communication facility and listens on it. You create a separate small program that, when run with an NZB file as a parameter, opens the pipe, feeds the file info into it, and exits. Your main program then processes the new file and downloads it.
回答2:
Why not have one program that adds the file to a queue, and then kicks off the downloading program if it is not already running. That downloading program watches the queue, which is just a file that you append download file names to.
回答3:
Look at the InitialInstanceActivator at the Genghis project
回答4:
Use an IPC (inter process communication) mechanism such as .net remoting
来源：https://stackoverflow.com/questions/917883/c-sharp-how-to-single-instance-application-that-accepts-new-parameters