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Mac Forum / Programming / Mac Programming / November 2006C++ std::cout -> Where does it go?
Hello world, I have written a program, which uses QT as GUI and which runs happily in OS X and Linux. I can start the program in Ubuntu using ./myApp and all the output I send with std::cout << "Test" (etc) can be seen directly in the Shell-Window. In OS X Terminal, I use open myApp.app to start the program. However, the terminal is accessable right away, because the program is started as a new process (outside the terminal). Thus, the output from std::cout cannot be seen anywhere. How can I start a program in OS X such that the std::cout elements can be seen somewhere or how can I make it visible? Thanks a lot in advance Tim I think it might go to your "console.log". The usual way to get to this is to open the Console.app located in /Applications/Utilities. The physical file is located under /Library/Logs/Console/<uid>/. Someone correct me if I am wrong or TIAS. -- Brian Ray (http://kazavoo.com/) Hello! > I have written a program, which uses QT as GUI and which runs happily > in OS X and Linux. I can start the program in Ubuntu using [quoted text clipped - 10 lines] > How can I start a program in OS X such that the std::cout elements can > be seen somewhere or how can I make it visible? Go into the bundle: cd myApp.app/Contents/MacOS and start the executable from there (should be ./myApp). open sends the given file to the default application which is - for applications - the Finder. Starting applications with the Finder connects stdout with /dev/null and everything written to stderr is sent to console.log. HTH, Daniel Thanks a lot for the tips, this is how I solved it... Daniel H?pfl wrote: > Hello! > [quoted text clipped - 15 lines] > Go into the bundle: cd myApp.app/Contents/MacOS and start the executable > from there (should be ./myApp). At first, this did not work because some files were leaded from other sources, and the relative paths did not work from within myApp.app/Contents/... However, in Qt there is the option not to build the files as a bundle but directly. This gives more Linux-Style files which can be started directly by typing ./myApp Having changed this option in the project file by CONFIG-=app_bundle and rebuilt the whole thing, I can now start the application by ./myApp and the output goes where it belongs: The terminal. > open sends the given file to the default application which is - for > applications - the Finder. Starting applications with the Finder > connects stdout with /dev/null and everything written to stderr is sent > to console.log. Good to know, thanks! Greetings Tim > HTH, > Daniel > At first, this did not work because some files were leaded from other > sources, and the relative paths did not work from within > myApp.app/Contents/... However, in Qt there is the option not to build > the files as a bundle but directly. This gives more Linux-Style files > which can be started directly by typing ./myApp If you want something that acts like a normal Mac applicaiton then you should continue to build a bundled .app. (You should also avoid Qt, but that's a topic for another day.) The problem is not the bundled app, but rather that Mac applications cannot depend on the working directory to be set to anything useful when they start. If your code needs the working directory to be set to, for example, your Contents/Resources directory, then you should set it yourself. You can do this by using CFBundle to get/construct the path, then set the working directory appropriately early on in your code.  SignatureMichael Ash Rogue Amoeba Software > I have written a program, which uses QT as GUI and which runs happily > in OS X and Linux. I can start the program in Ubuntu using [quoted text clipped - 10 lines] > How can I start a program in OS X such that the std::cout elements can > be seen somewhere or how can I make it visible? If this is just for debugging, you can run your app from within the Xcode environment. It redirects all this output to a window. -- David |
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