BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  OpenGL in a CGI webserver application          BorlandTalk.com Forum Index -> Delphi Graphics View previous topic :: View next topic   Author Message Andi Guest Posted: Mon Apr 26, 2004 11:47 am    Post subject: OpenGL in a CGI webserver application Hi, I am trying to write a webserver CGI app which, as response to a TWebRequest, produces an OpenGL-based image. When doing so I always get an error on the webserver (with no error message, just beeping and no image shown), and the app hangs. While there is no window I use GetDC(0) to get a device context handle. Btw: I am quite familiar with HTTP, mime types, TWebRequest and OpenGL. I succeeded in writing a console app producing a bmp or jpg and saving it to disc; this app runs on the webserver without any problems, using GetDC(0) too. I also succeeded in painting to a bmp's canvas (without using OpenGL) and passing it back to the client as a jpg image. Maybe its a problem with the anonymous internet user (triggering the app via his web browser/HTTP request)? I am running W2K, IIS5 and D7E. Any ideas or experiences? Thx Andi Back to top Dominique Louis Guest Posted: Mon Apr 26, 2004 1:53 pm    Post subject: Re: OpenGL in a CGI webserver application sounds to me like some sort of opengl initialisation code is not being called. What happens if you just use the working opengl console app as a CGI exe just for testing purposes? Does that still create the image? Dominique. Andi wrote: Quote: I am trying to write a webserver CGI app which, as response to a TWebRequest, produces an OpenGL-based image. When doing so I always get an error on the webserver (with no error message, just beeping and no image shown), and the app hangs. While there is no window I use GetDC(0) to get a device context handle. Btw: I am quite familiar with HTTP, mime types, TWebRequest and OpenGL. I succeeded in writing a console app producing a bmp or jpg and saving it to disc; this app runs on the webserver without any problems, using GetDC(0) too. I also succeeded in painting to a bmp's canvas (without using OpenGL) and passing it back to the client as a jpg image. Maybe its a problem with the anonymous internet user (triggering the app via his web browser/HTTP request)? I am running W2K, IIS5 and D7E. Any ideas or experiences? Thx Andi Back to top Andi Guest Posted: Mon Apr 26, 2004 2:19 pm    Post subject: Re: OpenGL in a CGI webserver application I tried but it doesn't work either. Seems to depend on who is calling the app: the normal interactive user or the Web user. "Dominique Louis" <savage (AT) delphigamer (DOT) com> schrieb im Newsbeitrag news:408d138b (AT) newsgroups (DOT) borland.com... Quote: sounds to me like some sort of opengl initialisation code is not being called. What happens if you just use the working opengl console app as a CGI exe just for testing purposes? Does that still create the image? Dominique. Andi wrote: I am trying to write a webserver CGI app which, as response to a TWebRequest, produces an OpenGL-based image. When doing so I always get an error on the webserver (with no error message, just beeping and no image shown), and the app hangs. While there is no window I use GetDC(0) to get a device context handle. Btw: I am quite familiar with HTTP, mime types, TWebRequest and OpenGL. I succeeded in writing a console app producing a bmp or jpg and saving it to disc; this app runs on the webserver without any problems, using GetDC(0) too. I also succeeded in painting to a bmp's canvas (without using OpenGL) and passing it back to the client as a jpg image. Maybe its a problem with the anonymous internet user (triggering the app via his web browser/HTTP request)? I am running W2K, IIS5 and D7E. Any ideas or experiences? Thx Andi Back to top Yahia El-Qasem Guest Posted: Mon Apr 26, 2004 5:05 pm    Post subject: Re: OpenGL in a CGI webserver application I would imagine that OpenGL needs a "desktop" ( see CreateWindowStation / CreateDesktop in the Win32 online help )... Yahia Back to top Andre Becker Guest Posted: Mon Apr 26, 2004 9:51 pm    Post subject: Re: OpenGL in a CGI webserver application Sounds interesting, but I never heard of these functions. Now I found them in Win32 help, but I still have no idea how to use them. My (well working) console app doesn't need them. Have you any hint for me how I can bring my web app to work? Thx "Yahia El-Qasem" <Yahia.El-Qasem (AT) mgh (DOT) metro-ag.de> schrieb im Newsbeitrag news:408d4194 (AT) newsgroups (DOT) borland.com... Quote: I would imagine that OpenGL needs a "desktop" ( see CreateWindowStation / CreateDesktop in the Win32 online help )... Yahia Back to top Yahia El-Qasem Guest Posted: Mon Apr 26, 2004 10:11 pm    Post subject: Re: OpenGL in a CGI webserver application never did anything with OpenGL... In an IIS / ISAPI app there is no desktop available by default. if you have any graphics intensive APIs sometimes they need for proper initialization a desktop... one way is to run them as standard application where windows already has a default "desktop" up and running... with the functions I mentioned you can create your own desktop from within your web app... which hopefully enables OpenGL to work properly... my experience with these functions is photoshop / IIS / ISAPI app related... you can't get Photoshop ActiveX up and running from within an ISAPI without a desktop... these functions make it happen in the phohoshop case :-) sorry...I don't have that code at hands at the moment... Yahia "Andre Becker" <andi (AT) hunter (DOT) numerikon.de> schrieb im Newsbeitrag news:408d845b$1 (AT) newsgroups (DOT) borland.com... Quote: Sounds interesting, but I never heard of these functions. Now I found them in Win32 help, but I still have no idea how to use them. My (well working) console app doesn't need them. Have you any hint for me how I can bring my web app to work? Thx "Yahia El-Qasem" <Yahia.El-Qasem (AT) mgh (DOT) metro-ag.de> schrieb im Newsbeitrag news:408d4194 (AT) newsgroups (DOT) borland.com... I would imagine that OpenGL needs a "desktop" ( see CreateWindowStation / CreateDesktop in the Win32 online help )... Yahia Back to top Rene Tschaggelar Guest Posted: Tue Apr 27, 2004 8:17 am    Post subject: Re: OpenGL in a CGI webserver application Andi wrote: Quote: Hi, I am trying to write a webserver CGI app which, as response to a TWebRequest, produces an OpenGL-based image. When doing so I always get an error on the webserver (with no error message, just beeping and no image shown), and the app hangs. While there is no window I use GetDC(0) to get a device context handle. Btw: I am quite familiar with HTTP, mime types, TWebRequest and OpenGL. I succeeded in writing a console app producing a bmp or jpg and saving it to disc; this app runs on the webserver without any problems, using GetDC(0) too. I also succeeded in painting to a bmp's canvas (without using OpenGL) and passing it back to the client as a jpg image. Maybe its a problem with the anonymous internet user (triggering the app via his web browser/HTTP request)? I am running W2K, IIS5 and D7E. Any ideas or experiences? Unfortunately no experience. Apparently you next step is to produce a JPG from the OpenGL. Or perhaps rather a moviestream. Rene Back to top Eric Grange Guest Posted: Tue Apr 27, 2004 8:55 am    Post subject: Re: OpenGL in a CGI webserver application Quote: Any ideas or experiences? Thx You could try using the MESA DLLs (software OpenGL) instead of the default windows one, I've had some issues server-side with MS OpenGL that were solved by using MESA (just drop the DLLs in your exe's directory). You can find binaries here: http://sourceforge.net/project/showfiles.php?group_id=29749 However, my server-side use is in a full-blown Delphi HTTP service application, not something invoked by IIS. Eric Back to top DaveH Guest Posted: Tue Apr 27, 2004 6:40 pm    Post subject: Re: OpenGL in a CGI webserver application You need to edit your Web Services setting. Go into "Services" under an Administrator account. Scroll to the bottom and look at the propeties for Web Services. Check off the "Interact with the desktop" option. Now your web app can get valid DC's. DaveH "Andi" <andi (AT) hunter (DOT) numerikon.de> wrote Quote: Hi, I am trying to write a webserver CGI app which, as response to a TWebRequest, produces an OpenGL-based image. When doing so I always get an error on the webserver (with no error message, just beeping and no image shown), and the app hangs. While there is no window I use GetDC(0) to get a device context handle. Btw: I am quite familiar with HTTP, mime types, TWebRequest and OpenGL. I succeeded in writing a console app producing a bmp or jpg and saving it to disc; this app runs on the webserver without any problems, using GetDC(0) too. I also succeeded in painting to a bmp's canvas (without using OpenGL) and passing it back to the client as a jpg image. Maybe its a problem with the anonymous internet user (triggering the app via his web browser/HTTP request)? I am running W2K, IIS5 and D7E. Any ideas or experiences? Thx Andi Back to top Andi Guest Posted: Wed Apr 28, 2004 8:50 am    Post subject: Re: OpenGL in a CGI webserver application I looked under "WWW Publishing service", and there the "Interact with the desktop" option was already checked off. Am I doing wrong? "DaveH" <daveh (AT) sympatico (DOT) com> schrieb im Newsbeitrag news:1083091241.703404 (AT) news (DOT) drenet.dnd.ca... Quote: You need to edit your Web Services setting. Go into "Services" under an Administrator account. Scroll to the bottom and look at the propeties for Web Services. Check off the "Interact with the desktop" option. Now your web app can get valid DC's. DaveH "Andi" <andi (AT) hunter (DOT) numerikon.de> wrote in message news:408cf6d5$1 (AT) newsgroups (DOT) borland.com... Hi, I am trying to write a webserver CGI app which, as response to a TWebRequest, produces an OpenGL-based image. When doing so I always get an error on the webserver (with no error message, just beeping and no image shown), and the app hangs. While there is no window I use GetDC(0) to get a device context handle. Btw: I am quite familiar with HTTP, mime types, TWebRequest and OpenGL. I succeeded in writing a console app producing a bmp or jpg and saving it to disc; this app runs on the webserver without any problems, using GetDC(0) too. I also succeeded in painting to a bmp's canvas (without using OpenGL) and passing it back to the client as a jpg image. Maybe its a problem with the anonymous internet user (triggering the app via his web browser/HTTP request)? I am running W2K, IIS5 and D7E. Any ideas or experiences? Thx Andi Back to top Dominique Louis Guest Posted: Wed Apr 28, 2004 9:46 am    Post subject: Re: OpenGL in a CGI webserver application Andi wrote: Quote: I looked under "WWW Publishing service", and there the "Interact with the desktop" option was already checked off. Am I doing wrong? Hi Andi, I think he mean that it has to have the check box ticked. That is the only way it will be able to generate a DC. If I am wrong I am sure DaveH will correct me. Dominique. Back to top Andi Guest Posted: Wed Apr 28, 2004 9:53 am    Post subject: Re: OpenGL in a CGI webserver application Ok, I tried both: option checked and option unchecked (and restarted the service). It is both the same: doesn't work. "Dominique Louis" <savage (AT) delphigamer (DOT) com> schrieb im Newsbeitrag news:408f7cc9$1 (AT) newsgroups (DOT) borland.com... Quote: Andi wrote: I looked under "WWW Publishing service", and there the "Interact with the desktop" option was already checked off. Am I doing wrong? Hi Andi, I think he mean that it has to have the check box ticked. That is the only way it will be able to generate a DC. If I am wrong I am sure DaveH will correct me. Dominique. Back to top Andi Guest Posted: Wed Apr 28, 2004 10:01 am    Post subject: Re: OpenGL in a CGI webserver application I tried the latest MESA binaries. Behavior is different then: gives me an error message (Access violation in opengl32.dll...) rather than just beeping (on the server) and doing/saying nothing. Interesting, but didn't really help. "Eric Grange" <egrange (AT) glscene (DOT) org> schrieb im Newsbeitrag news:408e1f35$1 (AT) newsgroups (DOT) borland.com... Quote: Any ideas or experiences? Thx You could try using the MESA DLLs (software OpenGL) instead of the default windows one, I've had some issues server-side with MS OpenGL that were solved by using MESA (just drop the DLLs in your exe's directory). You can find binaries here: http://sourceforge.net/project/showfiles.php?group_id=29749 However, my server-side use is in a full-blown Delphi HTTP service application, not something invoked by IIS. Eric Back to top Dave Hackett Guest Posted: Thu Apr 29, 2004 3:22 am    Post subject: Re: OpenGL in a CGI webserver application If you debugged to the code that did the "GetDC", what is the DC handle? Is it valid (ie non zero)? Now if you check ON the option "Interact with the desktop" and reboot and debug to the same place, is the DC valid? You can't go any further until you have a valid DC. BTW, Are you executing under IIS? If so, what isolation mode do you use? Try not isolating it so it executes in the same space as IIS and therefore has the same security credentials. DaveH "Andi" <andi (AT) hunter (DOT) numerikon.de> wrote Quote: Ok, I tried both: option checked and option unchecked (and restarted the service). It is both the same: doesn't work. "Dominique Louis" <savage (AT) delphigamer (DOT) com> schrieb im Newsbeitrag news:408f7cc9$1 (AT) newsgroups (DOT) borland.com... Andi wrote: I looked under "WWW Publishing service", and there the "Interact with the desktop" option was already checked off. Am I doing wrong? Hi Andi, I think he mean that it has to have the check box ticked. That is the only way it will be able to generate a DC. If I am wrong I am sure DaveH will correct me. Dominique. 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