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  • Tools for debugging when debugger can't get you there?

    - by brian1001
    I have a fairly complex (approx 200,000 lines of C++ code) application that has decided to crash, although it crashes a little differently on a couple of different systems. The trick is that it doesn't crash or trap out in debugger. It only crashes when the application .EXE is run independently (either the debug EXE or the release EXE - both behave the same way). When it crashes in the debug EXE, and I get it to start debugging, the call stack is buried down into the windows/MFC part of things, and isn't reflecting any of my code. Perhaps I'm seeing a stack corruption of some sort, but I'm just not sure at the moment. My question is more general - it's about tools and techniques. I'm an old programmer (C and assembly language days), and a relative newcomer (couple/few years) to C++ and Visual Studio (2003 for this projecT). Are there tricks or techniques anyone's had success with in tracking down crashing issues when you cannot make the software crash in a debugger session? Stuff like permission issues, for example? The only thing I've thought of is to start plugging in debug/status messages to a logfile, but that's a long, hard way to go. Been there, done that. Any better suggestions? Am I missing some tools that would help? Is VS 2008 better for this kind of thing? Thanks for any guidance. Some very smart people here (you know who you are!). cheers.

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  • Attend my Tech Ed 2014 session: Debugging Tips and Tricks

    - by Daniel Moth
    Just a week away, at Tech Ed 2014 NA in Houston Texas, I will be giving a demo presentation that you will not want to miss (assuming you code in Visual Studio). Add it to your calendar now: DEV-B352 Debugging Tips and Tricks in Visual Studio 2013 (link) Monday, May 12 1:15-2:30 PM, Room: General Assembly C As a developer, regardless of your programming language or the platform that you target, you use the debugger on a daily basis. Come to this all-demo session to learn how to make the most of the Visual Studio debugger, and hence be more productive and effective in your everyday development. We tour almost all of the debugger surface and many of its commands, throwing in tips and tricks as we go along, and also calling out what is brand new in the latest version of the debugger in Microsoft Visual Studio 2013. Whatever your experience level, you are guaranteed to leave with new knowledge of debugger features that you will want to use immediately when you are back at your computer!   I am also co-presenting another session later in the week. DEV-B313 Diagnosing Issues in Windows Phone 8.1 XAML Applications Using Visual Studio 2013 (link) Thursday, May 15 10:15-11:30 AM, Room: 340 Come to this demo-driven session to learn how to use the latest diagnostic tools in Visual Studio 2013 to make your Windows Phone 8.1 XAML apps reliable, fast, and efficient. Learn how to make the most of existing capabilities in the debugger as well as new debugging features for diagnosing correctness issues. Also, see the Visual Studio Performance and Diagnostics hub in action with its performance analysis tools for diagnosing CPU usage, memory usage, and energy consumption. The techniques covered in this session apply equally well for Windows Store apps as well as Windows Phone Store apps, so all your device development needs will be covered.   Links to both sessions from my Tech Ed speaker page. See you there! Comments about this post by Daniel Moth welcome at the original blog.

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  • How to view Session Variables in Visual Studio 2008 Debugger?

    - by davemackey
    Usually using Visual Studio's debugger is a breeze. Scanning through Locals quickly shows the values of variables, etc. However, I'm at a loss how to find out the values contained in session state variables? Can anyone give me a hand? Lets say I put a breakpoint right after: Session("first_name") = "Rob Roy" How do I view the value contained in Session("first_name") from locals?

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  • Xcode debugger stops with "EXC_BAD_ACCESS" - bug in my code or in Xcode?

    - by Substance G
    Hi, I got this error just one time (non-repeatable) while running my Objective-C & C++ program with the Xcode debugger: Program received signal: “EXC_BAD_ACCESS”. Xcode could not locate source file: sweep.c (line: 1026) kill quit I don't have any references to any "sweep.c" in my code, so I'm thinking maybe it's a Xcode/GDB error. Anything I can do to further investigate this? Am using standard Xcode 3.2.2 (uses GNU gdb 6.3.50-20050815 (Apple version gdb-1460)) on OS X 10.6.3

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  • JavaScript method to write to Microsoft Visual Web Developer Debugger?

    - by Josh
    I generally test my web apps with Firefox and use Firebug. I love Firebug. But when I'm testing JavaScript code in IE I use the debugger in Microsoft's Visual Web Developer 2008 Express Edition. I would love to have an equivalent to Firebug's console.log methods which would allow me to log messages to Visual Web Developer. Any way to log messages to the error list/messages list/output pane using JavaScript?

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  • autoexp.dat does not seem to take affect in Visual Studio C++ 2005 debugger.

    - by Pradyot
    autoexp.dat does not seem to take affect in Visual Studio C++ 2005 debugger. I am not trying to add any custom rules. Just want commonly used stuff like stl::string, to display in a friendlier manner. Does anyone know. how I can accomplish this? Is this just question of specifying a path to the autoexp.dat file somewhere. The file is available under the Visual Studio installation directory.

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  • Why does the VS2005 debugger not report "base." values properly? (was "Why is this if statement fail

    - by Rawling
    I'm working on an existing class that is two steps derived from System.Windows.Forms.Combo box. The class overrides the Text property thus: public override string Text { get { return this.AccessibilityObject.Value; } set { if (base.Text != value) { base.Text = value; } } } The reason given for that "get" is this MS bug: http://support.microsoft.com/kb/814346 However, I'm more interested in the fact that the "if" doesn't work. There are times where "base.Text != value" is true and yet pressing F10 steps straight to the closing } of the "set" and the Text property is not changed. I've seen this both by just checking values in the debugger, and putting a conditional breakpoint on that only breaks when the "if" statement's predicate is true. How on earth can "if" go wrong? The class between this and ComboBox doesn't touch the Text property. The bug above shouldn't really be affecting anything - it says it's fixed in VS2005. Is the debugger showing different values than the program itself sees? Update I think I've found what is happening here. The debugger is reporting value incorrectly (including evaluating conditional breakpoints incorrectly). To see this, try the following pair of classes: class MyBase { virtual public string Text { get { return "BaseText"; } } } class MyDerived : MyBase { public override string Text { get { string test = base.Text; return "DerivedText"; } } } Put a breakpoint on the last return statement, then run the code and access that property. In my VS2005, hovering over base.Text gives the value "DerivedText", but the variable test has been correctly set to "BaseText". So, new question: why does the debugger not handle base properly, and how can I get it to?

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  • What the best multi-thread application debugger for C++ apps.

    - by Coredumped
    I'm looking for a good multi-thread-aware debugger, capable of showing performance charts of application threads on Linux, don't know if such a thing exists, perhaps as a Eclipse plugin. The idea would be to track per thread memory allocation a CPU usage as well as being able to interrupt a thread and examine its stack trace, local vars, etc. It does not have to be an eclipse plugin or a free tool, do any of you have heard of something similar?

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  • Can I debug with python debugger when using py.test somehow?

    - by Joel
    I am using py.test for unit testing my python program. I wish to debug my test code with the python debugger the normal way (by which i mean pdb.set_trace() in the code) but I can't make it work. Putting pdb.set_trace() in the code doesn't work (raises IOError: reading from stdin while output is captured). I have also tried running py.test with the option --pdb but that doesn't seem to do the trick if I want to explore what happens before my assertion. It breaks when an assertion fails, and moving on from that line means terminating the program. Does anyone know a way to get debugging, or is debugging and py.test just not meant to be together?

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  • How to use Visual Studio debugger visualizers built against a different framework version?

    - by michielvoo
    I compiled the ExpressionTreeVisualizer project found in the Visual Studio 2010 samples but when I try to use it in a .NET 3.5 project I get the exception below: Could not load file or assembly 'file:///C:\Program Files (x86)\Microsoft\Visual Studio 2010\Common7\Packages\Debugger\Visualizers\ExpressionTreeVisualizer.dll' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded. The sample project had the TargetFrameworkVersion set to v4.0 and after changing it to v3.5 and building it now works in my project. I changed the source code and project file and rebuilt it so that I now have two expression tree visualizers, one for v3.5 projects and one for v4.0 projects. Is there a better way? Thanks!

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  • Can i configure emacs to use gdb like a graphical debugger?

    - by Joey Carson
    I'm pretty sure that this how other IDE's do it, e.g. on windows eclipse uses the output of gdb from MinGW (the windows port of GNU toolchain) to map where execution is in the source code and what values variables hold, etc. I'm stuck using gdb via a script that prepares our application in a chroot and does some other bootstrap for debug purposes. Once the script starts moving, the output is all gdb. Is there any way that I can configure emacs so that it will use gdb's output and allow for a sort of graphical debugger, comparable to that of eclipse or ms visual studio?

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  • How do I use my own debugger visualiser to edit variables runtime?

    - by C Sharper
    I'm writing my own debugger visualiser. All works great to show up to visualiser with the data. Now I add the code for more clearness: public class MyVisualiserObjectSource : VisualizerObjectSource { public override void GetData(object target, Stream outgoingData) { string data= target as string; var writer = new StreamWriter(outgoingData); writer.Write(data); writer.Flush(); } } public class MyVirtualizer : DialogDebuggerVisualizer { protected override void Show(IDialogVisualizerService windowService, IVisualizerObjectProvider objectProvider) { var streamReader = new StreamReader(objectProvider.GetData()); string data = streamReader.ReadToEnd(); using (var form = new MyVirtualizerForm(data)) { windowService.ShowDialog(form); } } } The string here is passed to the visualizer and show my own form. It works. But now I want to pass back the modified data from the form to the variable. How do I do that? Edit: I found out that I need to override the TransferData method in VisualizerObjectSource. But in the MSDN is no detail information about how I implement this correctly. Can someone help me please?

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  • VS 2008 debugger: How does it decide what Cassini port to run a web service under?

    - by BDW
    I have a VS 2008 solution that includes a web site and a web service. I'm developing both at once, and it's helpful to be able to debug from one into the other. It occasionally can't find the web service. If I look in the web.config, I find the port number it's looking at is not the port number it auto-runs the service in when I use the debugger. For example, the web.config reference says something like: add key="mynamespace.mywebservice" value="http://localhost:55765/mywebservice.asmx" When I hover over the Cassini port icon, I find that the web service is running in port 55382 (or some other non-55765 port). No wonder it can't find it. Is there a way to enforce that the port number it runs under is the one specified in the web config? And if it's not using the web config port number to figure out where to run it... where does it decide? I know in VS2005, there was a way to specify the port number to use when debugging, but I can't find that anywhere in the web service project in VS 2008. This is really going to cause problems as more developers come on to this project - how can I fix it? Deleting and re-adding the web services to the project fixes it, but I'd literally have to do it a couple times a day, not an ideal solution.

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  • Live Debugging

    - by Daniel Moth
    Based on my classification of diagnostics, you should know what live debugging is NOT about - at least according to me :-) and in this post I'll share how I think of live debugging. These are the (outer) steps to live debugging Get the debugger in the picture. Control program execution. Inspect state. Iterate between 2 and 3 as necessary. Stop debugging (and potentially start new iteration going back to step 1). Step 1 has two options: start with the debugger attached, or execute your binary separately and attach the debugger later. You might say there is a 3rd option, where the app notifies you that there is an issue, referred to as JIT debugging. However, that is just a variation of the attach because that is when you start the debugging session: when you attach. I'll be covering in future posts how this step works in Visual Studio. Step 2 is about pausing (or breaking) your app so that it makes no progress and remains "frozen". A sub-variation is to pause only parts of its execution, or in other words to freeze individual threads. I'll be covering in future posts the various ways you can perform this step in Visual Studio. Step 3, is about seeing what the state of your program is when you have paused it. Typically it involves comparing the state you are finding, with a mental picture of what you thought the state would be. Or simply checking invariants about the intended state of the app, with the actual state of the app. I'll be covering in future posts the various ways you can perform this step in Visual Studio. Step 4 is necessary if you need to inspect more state - rinse and repeat. Self-explanatory, and will be covered as part of steps 2 & 3. Step 5 is the most straightforward, with 3 options: Detach the debugger; terminate your binary though the normal way that it terminates (e.g. close the main window); and, terminate the debugging session through your debugger with a result that it terminates the execution of your program too. In a future post I'll cover the ways you can detach or terminate the debugger in Visual Studio. I found an old picture I used to use to map the steps above on Visual Studio 2010. It is basically the Debug menu with colored rectangles around each menu mapping the menu to one of the first 3 steps (step 5 was merged with step 1 for that slide). Here it is in case it helps: Stay tuned for more... Comments about this post by Daniel Moth welcome at the original blog.

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  • Is there any way to automatically break into debugger when my class library functions are getting ca

    - by mishal153
    I have a managed class library (say mylib.dll) and a 3rd party managed app (say app.exe) which is using mylib.dll. I have the code of mylib.dll but not of the app.exe. So currently what i do is i build mylib.dll, copy it to app.exe's directory, start app.exe and attach to the process. That way if i put breakpoints in code mylib.dll , i see them being hit. But is there anyway to automatically break in code of mylib.dll whenever any external application calls one of its exposed methods ? ie. Only for entrypoints of the dll. thanks, Mishal

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  • Using a debugger and curses at the same time?

    - by Matt Joiner
    I'm calling python -m pdb myapp.py, when an exception fires, and I'd normally be thrown back to the pdb interpreter to investigate the problem. However this exception is being thrown after I've called through curses.wrapper() and entered curses mode, rendering the pdb interpreter useless. How can I work around this?

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  • How to set the correct Visual Studio version as JIT debugger?

    - by Lothar
    I have VS2003, VS2005 and VS2008 installed on my machine. The C++ application is compiled with VS2005 but when it crashs and i select debug the Just-In-Time Debugging dialog comes up and only offers me "New instance of Visual Studio .NET 2003". Debugging a 2005 compiled program with 2003 is not possible. If i attach the process to VS2005 then it works well, but this is very inconvenient. How do i set .NET 2005 vor JIT debugging?

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  • How is "Make Object ID" implemented in the .NET debugger?

    - by Omer Raviv
    Hi, I would like know how this feature is implemented in VS - I understand it holds some sort of weak-reference to the object in the debugged-application's memory, but how exactly is it accomplished? I know simply tracking the address (as in native code) wouldn't work, because the GC might move the object about, invalidating the address. Thanks.

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