wrap c++ objects with inheritance
Can anyone point me to documentation or examples of how to wrap C++ objects with gobject and preserve inheritance? I want to do something like this: ClassA ClassB (inherits from ClassA) and wrap in gobject like this: GClassA GClassB and I need to be able to cast GClassB back to GClassA. GClassA will have as a private member a pointer to ClassA, and GClassB will have a pointer to ClassB. What's the most elegant way to do this? Thanks, Matthew ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Strange display problem with gtk-win32 and VC++
For the past few years I've been migrating my Windows apps to GTK+ which I now tend to use in preference to Microsoft's MFC. However, I've always been conscious of the fact that the official gnome binaries are (apparently) built using the 'C' runtime that equates to VC6. VC6 has been obsolete for nearly a decade and is utterly useless for building modern-day apps. As it happens, I'm building with VC8 but I'm worried about the potential problems of mixing VC6 and VC8 runtimes in the same application. Fortunately, the more recent releases of GTK+ come with Visual Studio projects supplied as part of the sources. So I decided to try and build libgtk-win32 and its dependencies, using VC8. To test my build, I used a very simple Hello World app. In fact it's the Hello World example from Andrew Krause's book 'Foundations of GTK+ Development'. It launches a very simple window whose title is Hello World!. The window has a gtk label which is supposed to display the text Welcome to GTK+. If I build the app and link it to the official gnome binaries, it works perfectly well. However, if I rebuild those binaries (using the various Visual Studio projects supplied with gtk / glib etc) the app doesn't work. The window and title display correctly but the label (which is supposed to say Welcome to GTK+) just displays a sequence of 15 squares. The number of squares is always related to the label. So if I shorten the label text to 10 characters, I get 10 squares etc. I'm not sure if this mailing list supports file attachments but if there's a way to attach a file, I have a small screenshot available which illustrates the problem. Anyway, has anyone here ever seen this kind of thing before? Or can anyone suggest a particular place where I should start looking for the problem? John ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Problem with 64 bit gtk binaries in Win 7 (32 bit works fine)
Hello, thanks for the info about the underscores : ), now I learned something interesting. I ended up downloading the source and MSYS and compiling GTK+ in my 64 bit system. It was a long and tedious process :P getting all the dependencies, setting up environment variables... also I had to install PERL because some part of the compilation needed it, but... In the end compiling it worked and my linker now recognized it and I didn't have underscores problems anymore :) However, I found that it didn't solve the vertex problem. I was so frustrated that I ended up compiling WxWindows and trying to learn how to use it (which has been a bit complicated because I don't have too much time left for this project), but when I built the app using WxWindows, I had the same problem! Here is a more detailed description of this problem: I have a class that stores values read from files in float arrays. I have another class that uses the previous one, and this latter class is used in the main file, in the GTK+ functions. In my laptop with a 32 bit system, everything is cool. It works as expected. In my 64 bit machine (and another 64 bit machine), the array values are messed up. If I initialize the arrays to some arbitrary number, that will be the final value of the arrays when I call them. However, if I directly called the first class from the main.cpp file without using the second class, it works! I built a test program that uses those classes the same way, without using GTK+ (using GLUT for window creation), it works without a problem! After discovering that WxWindows didn't solve the problem, I set up various tests, and in the end found out the source of the problem. In the class that reads from files, I was using cstdio functions (fscanf mainly). I found out than when called from GTK+ with the intermediary class, the fscanf calls would read the strings but not the floats, the values stored in the passed variables would stay the same as before the call. (these values are vertex positions) I solved this issue changing all the csdtio calls to c++ calls ( from the ifstream library e.g. ifstream fin(file); finfloatVar; ). With the c++ calls the values were adecuately read and stored. There is a side problem, now the reading process is significantly slower and I have to wait several seconds for the program to read the files. I am utterly perplexed by this, any insight is welcome : ) Thanks again for your time, and thanks Jaroslay for answering my first e-mail. Mario Maqueo 2010/11/2 Jaroslav Šmíd jardas...@gmail.com Mingw64 defaults to no leading underscores (this is quite new feature), make sure GTK+ libraries are compiled by mingw64 version built after this was done. If you use newer mingw64 and older GTK+ or vice versa - trouble ahead :-) On Tue, Nov 2, 2010 at 9:03 AM, Mario M maqueo.ma...@gmail.com wrote: Hello, I have Windows 7 64 bits and I am working on a GTK+ project that uses OpenGL in C++. I am using GLADE and the normal version of GTK+ (not gtkmm). I was working on a laptop with Windows 7 32 bits and the program worked fine, but the video card in that laptop was really bad (Intel, integrated) so I switched to a desktop with 64 bit windows and a better video card (Nvidia GT 240). The code compiles fine in both versions of windows, using the 32 bit version of gtk. However, some horrible things have been happening: - The OpenGL window would not update correctly, taking a long time to do so, seemingly at random times. I was using gtkglext for the OpenGL binding but I found out this problem was caused by gtkglext not being updated (since 2006) and the problem is with Aero in Windows, If desktop compositing was disabled, it would work fine. I decided to ditch gtkglext and use OpenGL directly, after a while I managed to and this problem was fixed. - Some colors were messed up with lighting enabled, at first I thought this and the previous problem had to do with the video card, but this was weird because the same program without gtk would work fine. However I managed to correct it adding a few simple OpenGL instructions. I'm not sure why it worked fine without GTK+, but it seems to work fine now with my fix. - I have a library for loading 3d models, in my laptop it worked fine, but on the new computer (and another one where i tested it), the 3d models render as a single horizontal :S, all of them. They are drawn using openGL functions and storing the vertex positions in lists. I discovered this: When I load an object in the main.cpp file, and draw it, it works fine, however, when I load it in an external file, and draw it, it doesn't work ( I get just a horizontal line, and again, without gtk+ it works fine). This has me really perplexed, I think it might have something to do with the linker but I have no idea how. I added some debugging and I think the problem is in the vertex positions, I printed their x,y,z
Re: Problem with 64 bit gtk binaries in Win 7 (32 bit works fine)
Sorry for the typo, Jaroslav. 2010/11/6 Mario M maqueo.ma...@gmail.com Hello, thanks for the info about the underscores : ), now I learned something interesting. I ended up downloading the source and MSYS and compiling GTK+ in my 64 bit system. It was a long and tedious process :P getting all the dependencies, setting up environment variables... also I had to install PERL because some part of the compilation needed it, but... In the end compiling it worked and my linker now recognized it and I didn't have underscores problems anymore :) However, I found that it didn't solve the vertex problem. I was so frustrated that I ended up compiling WxWindows and trying to learn how to use it (which has been a bit complicated because I don't have too much time left for this project), but when I built the app using WxWindows, I had the same problem! Here is a more detailed description of this problem: I have a class that stores values read from files in float arrays. I have another class that uses the previous one, and this latter class is used in the main file, in the GTK+ functions. In my laptop with a 32 bit system, everything is cool. It works as expected. In my 64 bit machine (and another 64 bit machine), the array values are messed up. If I initialize the arrays to some arbitrary number, that will be the final value of the arrays when I call them. However, if I directly called the first class from the main.cpp file without using the second class, it works! I built a test program that uses those classes the same way, without using GTK+ (using GLUT for window creation), it works without a problem! After discovering that WxWindows didn't solve the problem, I set up various tests, and in the end found out the source of the problem. In the class that reads from files, I was using cstdio functions (fscanf mainly). I found out than when called from GTK+ with the intermediary class, the fscanf calls would read the strings but not the floats, the values stored in the passed variables would stay the same as before the call. (these values are vertex positions) I solved this issue changing all the csdtio calls to c++ calls ( from the ifstream library e.g. ifstream fin(file); finfloatVar; ). With the c++ calls the values were adecuately read and stored. There is a side problem, now the reading process is significantly slower and I have to wait several seconds for the program to read the files. I am utterly perplexed by this, any insight is welcome : ) Thanks again for your time, and thanks Jaroslay for answering my first e-mail. Mario Maqueo 2010/11/2 Jaroslav Šmíd jardas...@gmail.com Mingw64 defaults to no leading underscores (this is quite new feature), make sure GTK+ libraries are compiled by mingw64 version built after this was done. If you use newer mingw64 and older GTK+ or vice versa - trouble ahead :-) On Tue, Nov 2, 2010 at 9:03 AM, Mario M maqueo.ma...@gmail.com wrote: Hello, I have Windows 7 64 bits and I am working on a GTK+ project that uses OpenGL in C++. I am using GLADE and the normal version of GTK+ (not gtkmm). I was working on a laptop with Windows 7 32 bits and the program worked fine, but the video card in that laptop was really bad (Intel, integrated) so I switched to a desktop with 64 bit windows and a better video card (Nvidia GT 240). The code compiles fine in both versions of windows, using the 32 bit version of gtk. However, some horrible things have been happening: - The OpenGL window would not update correctly, taking a long time to do so, seemingly at random times. I was using gtkglext for the OpenGL binding but I found out this problem was caused by gtkglext not being updated (since 2006) and the problem is with Aero in Windows, If desktop compositing was disabled, it would work fine. I decided to ditch gtkglext and use OpenGL directly, after a while I managed to and this problem was fixed. - Some colors were messed up with lighting enabled, at first I thought this and the previous problem had to do with the video card, but this was weird because the same program without gtk would work fine. However I managed to correct it adding a few simple OpenGL instructions. I'm not sure why it worked fine without GTK+, but it seems to work fine now with my fix. - I have a library for loading 3d models, in my laptop it worked fine, but on the new computer (and another one where i tested it), the 3d models render as a single horizontal :S, all of them. They are drawn using openGL functions and storing the vertex positions in lists. I discovered this: When I load an object in the main.cpp file, and draw it, it works fine, however, when I load it in an external file, and draw it, it doesn't work ( I get just a horizontal line, and again, without gtk+ it works fine). This has me really perplexed, I think it might have something to do with the linker but I have
Re: Strange display problem with gtk-win32 and VC++
On 11/6/2010 1:03 PM, John Emmas wrote: If I build the app and link it to the official gnome binaries, it works perfectly well. However, if I rebuild those binaries (using the various Visual Studio projects supplied with gtk / glib etc) the app doesn't work. The window and title display correctly but the label (which is supposed to say Welcome to GTK+) just displays a sequence of 15 squares. The number of squares is always related to the label. So if I shorten the label text to 10 characters, I get 10 squares etc. I'm not sure if this mailing list supports file attachments but if there's a way to attach a file, I have a small screenshot available which illustrates the problem. If it works with the official GTK binaries (which is what I assume you meant when you said gnome binaries), I would just stick with those. You don't want to be in the business of supplying GTK binaries. That's a difficult, time-consuming task; just look at all the conversations about the Windows GTK libraries involving Tor - no one ever wants to volunteer to help. Since the number of squares equals the number of characters in the label you are trying to display, the problem appears to be one of font rendering. Other than that meager observation, I can't really help. -- Guy Rouillier ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
