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.NET Forum / Languages / C# / January 2008vshost
Hello Newbie in asp net here. I have been struggling with a problem for weeks, and after analyzing logs I found something new. The problem in short: I have a web app, not done in .net. It is apache/php stuff. A few php pages make call to stand alone apps developed in c#. The c# apps makes operations on the windows media services, doing stuff like creating/ removing publishing points. Everything works well. But sometimes, maybe after 1 day, or 2 days, or a week, it happens that the php script that calls the c# app hangs upp. The script seems to run the c# app infinitely, without getting the return value from the app. The truth is that if I run the c# app from command line, it always works, even after the php-problem has showed up. But, after the problem has showed up, from php I cannot make call to any otther c# at all. Even a simple hello world c# app will not work. The only sollkution then is to restart the apache server. Then everything will work again until next time the php-call to c# app will hang up again. No one could help me in the php/apache groups, no one knows what this is about. So I have put log everywhere, both in the php scripts, and in the c# apps. The c# apps called from php, always execute without problems, and they never go in a catch statement. And they also log that they return something to the caller. I really dont understand where the problem is. The new thing I have discovered is the following: When the php stopped working (but remember that the only thing that doesnt work is the call to any exe-file, all the other pages work wiothout problems), I had a look at the task manager. Well, I saw that among the running processes there was one that had the same name as the exe file that was the last to be executed from php. BUT, the name of the file is somthing like: appname.vshost.exe What have I done? As I am a newbie, When I created my c# apps in the developement place (like C:\projects\mycapp) and tested that they worked, then I went to the folder C:\projects\mycapp\mycapp\bin \Release and copied all the files that were created in that directory. Then moved all these files into my webserver root. Soin the server root, I had these files, for the mycapp-project: mycapp.exe mycapp.vshost.exe mycapp.vshost.pdb Why? Well, I dont know. Probably because I am a newbie in visual studio, and just thought it was a good idea to move all the generated files. Thats it. My question is: what are vshost.exe files? Does anyone know why, when the php hangs up, I can see an vshost.exe file in the task manager? Why is it still running? Should I remove all these files, and only have app.exe for every project, in the webserver? Thank you. Well, it didnt help. I removed all the vshost's and pdb's. But it still happens that the calling php script hangs up when executing a c# app. The problem is that the c# app that eventually will make php to hang up executes without problems. I can see it in the log files. At the end of the try statement, the c# app returns a value. This is done with Console.Writeline(); However, when php hangs up, it seems like (checking in the log) that php waits forever for getting back the return value (the cnosole.writeline). After the php has hanghed up, if I try to run an app through the command line, it executes without problems, and even prints the console.writeline in the command windows. But if I call a dummy c# app, like cnosole.writeline("hello world"); then it will wait for ever, and never return the string. I don't know how you managed to get a call to a "vshost" executable other than that you errantly deployed a debug build of whatever it is that you are calling. Ensure that you make a release build and also that nothing with "vsHost" is deployed, and that it is tested and it works. -- Peter Site: http://www.eggheadcafe.com UnBlog: http://petesbloggerama.blogspot.com MetaFinder: http://www.blogmetafinder.com > Well, it didnt help. I removed all the vshost's and pdb's. But it > still happens that the calling php script hangs up when executing a c# [quoted text clipped - 14 lines] > app, like cnosole.writeline("hello world"); then it will wait for > ever, and never return the string. As I said before, the problem was not vshost. I have recompiled all the apps, and only deployed, for every app, the exe file and the required dll's. It is very frustating. I have put log everywhere, but no traces are showed there. The apps never go in the catch statement. The apps always work from command line. But for some reason the exec call from php hangs upp at some point. No one in the php/apache group understands why this happens, and cannot give me some good explanation. No one here that thinks to know why all this is happening? Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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