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• Why could cause the keypad backlights to spontaneously illuminate on my Palm Treo?

  - by LeopardSkinPillBoxHat

  I have a Palm Treo 680 smart phone. I have noticed recently that when the phone is turned off, the keypad backlights will spontaneously illuminate. This is particularly annoying because it drains the battery life of the Treo -- when I woke up this morning, the battery was completely flat and I had to plug it in to wake it up again. I suspect that this has something to do with the Energy Dimmer application (I have version 2.16 installed). I have disabled this application today to see if it makes the problem go away. Has anyone else had this problem, and do you have any solutions?

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• What could cause the keypad backlights to spontaneously illuminate on my Palm Treo? [closed]

  - by LeopardSkinPillBoxHat

  I have a Palm Treo 680 smart phone. I have noticed recently that when the phone is turned off, the keypad backlights will spontaneously illuminate. This is particularly annoying because it drains the battery life of the Treo -- when I woke up this morning, the battery was completely flat and I had to plug it in to wake it up again. I suspect that this has something to do with the Energy Dimmer application (I have version 2.16 installed). I have disabled this application today to see if it makes the problem go away. Has anyone else had this problem, and do you have any solutions?

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• Apparent leak in Mozilla Firefox

  - by LeopardSkinPillBoxHat

  I use Mozilla Firefox 3.6 all day, opening and closing tabs quite regularly. I am noticing over time that the firefox.exe process size keeps growing and growing over time. Initially I put this down to memory fragmentation caused by opening and closing tabs, but now I am suspecting that there is a memory leak in one of the add-ons that I have installed. The problem I am seeing is that when the process size gets to about 1.5GB in the "Mem Usage" stat in Task Manager (and it gets there quite regularly), Firefox freezes up. Does anyone have any ideas about how I could diagnose whether: Any of the add-ons are leaking memory? Something else is causing this problem?

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• Certain web pages are suddenly not rendering properly in FireFox

  - by LeopardSkinPillBoxHat

  I am using FireFox 3.6.3. I noticed in the last couple of days that several webpages which I visit regularly are not rendering properly. A lot of the text is overlapping with other text and it basically looks like the style sheet is completely screwed up. I have tried disabling all of my Add-Ons and it doesn't make a difference. When I use Coral IE Tab to render the pages using IE they display without any problems. The websites which are not rending properly for me are: The Age Google Reader One interesting thing I noticed is that if I modify the Google Reader URL to not use SSL (i.e. change https to http) it renders without any issues. However, The Age website is not using SSL, and that still doesn't render properly. I have also disabled my Proxy Server (I normally use one at work) but this doesn't make a difference either.

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• Is WEP used in conjunction with a wireless access list adequate security?

  - by LeopardSkinPillBoxHat

  I use a Netgear wireless router, with various wireless devices connecting to it. One of my wireless devices doesn't support WPA2 security, so I had to downgrade the security on the router to WEP. We all know WEP is broken, so as an added measure I enabled a wireless access list on the router so that only devices with specified MAC addresses which are in my access list are permitted to connect to the router. I know it is possible to spoof a MAC address from a device for the purposes of accessing a secure network like this. But is it easy? Is using WEP and a wireless access list good enough to prevent most hacking attacks? Or should I do whatever I can to ensure all devices support WPA2 in the future?

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• Sub-classing templated class without implementing pure virtual method

  - by LeopardSkinPillBoxHat

  I have the following class definition: template<typename QueueItemT> class QueueBC { protected: QueueBC() {}; virtual ~QueueBC() {}; private: virtual IItemBuf* constructItem(const QueueItemT& item) = 0; } I created the following sub-class: class MyQueue : public QueueBC<MyItemT> { public: MyQueue(); virtual ~MyQueue(); }; This compiles fine under VS2005, yet I haven't implemented constructItem() in the MyQueue class. Any idea why?

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• Allow member to be const while still supporting operator= on the class

  - by LeopardSkinPillBoxHat

  I have several members in my class which are const and can therefore only be initialised via the initialiser list like so: class MyItemT { public: MyItemT(const MyPacketT& aMyPacket, const MyInfoT& aMyInfo) : mMyPacket(aMyPacket), mMyInfo(aMyInfo) { } private: const MyPacketT mMyPacket; const MyInfoT mMyInfo; }; My class can be used in some of our internally defined container classes (e.g. vectors), and these containers require that operator= is defined in the class. Of course, my operator= needs to do something like this: MyItemT& MyItemT::operator=(const MyItemT& other) { mMyPacket = other.mPacket; mMyInfo = other.mMyInfo; return *this; } which of course doesn't work because mMyPacket and mMyInfo are const members. Other than making these members non-const (which I don't want to do), any ideas about how I could fix this?

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• What programming hack from your past are you most ashamed of?

  - by LeopardSkinPillBoxHat

  We've all been there (usually when we are young and inexperienced). Fixing it properly is too difficult, too risky or too time-consuming. So you go down the hack path. Which hack from your past are you most ashamed of, and why? I'm talking about the ones where you would be really embarrassed if someone could attribute the hack to you (quite easily if you are using revision control software). One hack per answer please. Mine was shortly after I started in my first job. I was working on a legacy C system, and there was this strange defect where a screen view failed to update properly under certain circumstances. I wasn't familiar with how to use the debugger at this time, so I added traces into the code to figure out what was going on. Then I realised that the defect didn't occur anymore with the traces in the code. I slowly backed out the traces one-by-one, until I realised that only a single trace was required to make the problem go away. My logic now would tell me that I was dealing with some sort of race-condition or timing related issue that the trace just "hid under the rug". But I checked in the code with the following line, and all was well: printf(""); Which hacks are you ashamed of?

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• Unresolved symbol when inheriting interface

  - by LeopardSkinPillBoxHat

  It's late at night here and I'm going crazy trying to solve a linker error. If I have the following abstract interface: class IArpPacketBuilder { public: IArpPacketBuilder(const DslPortId& aPortId); virtual ~IArpPacketBuilder(); // Other abstract (pure virtual methods) here... }; and I instantiate it like this: class DummyArpPacketBuilder : public IArpPacketBuilder { public: DummyArpPacketBuilder(const DslPortId& aPortId) : IArpPacketBuilder(aPortId) {} ~DummyArpPacketBuilder() {} }; why am I getting the following error when linking? Unresolved symbol references: IArpPacketBuilder::IArpPacketBuilder(DslPortId const&): ppc603_vxworks/_arpPacketQueue.o IArpPacketBuilder::~IArpPacketBuilder(): ppc603_vxworks/_arpPacketQueue.o typeinfo for IArpPacketBuilder: ppc603_vxworks/_arpPacketQueue.o *** Error code 1 IArpPacketBuilder is an abstract interface, so as long as I define the constructors and destructions in the concrete (derived) interface, I should be fine, no? Well it appears not.

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• When and why will an OS initialise memory to 0xCD, 0xDD, etc. on malloc/free/new/delete?

  - by LeopardSkinPillBoxHat

  I know that the OS will sometimes initialise memory with certain patterns such as 0xCD and 0xDD. What I want to know is when and why this happens. When Is this specific to the compiler used? Do malloc/new and free/delete work in the same way with regard to this? Is it platform specific? Will it occur on other operating systems, such as Linux or VxWorks? Why My understanding is this only occurs in Win32 debug configuration, and it is used to detect memory overruns and to help the compiler catch exceptions. Can you give any practical examples as to how this initialisation is useful? I remember reading something (maybe in Code Complete 2) that it is good to initialise memory to a known pattern when allocating it, and certain patterns will trigger interrupts in Win32 which will result in exceptions showing in the debugger. How portable is this?

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• Any useful suggestions to figure out where memory is being free'd in a Win32 process?

  - by LeopardSkinPillBoxHat

  An application I am working with is exhibiting the following behaviour: During a particular high-memory operation, the memory usage of the process under Task Manager (Mem Usage stat) reaches a peak of approximately 2.5GB (Note: A registry key has been set to allow this, as usually there is a maximum of 2GB for a process under 32-bit Windows) After the operation is complete, the process size slowly starts decreasing at a rate of 1MB per second. I am trying to figure out the easiest way to quickly determine who is freeing this memory, and where it is being free'd. I am having trouble attaching a memory profiler to my code, and I don't particularly want to override the new/delete operators to track the allocations/deallocations (IOW, I want to do this without re-compiling my code). Can anyone offer any useful suggestions of how I could do this via the Visual Studio debugger? Update I should also mention that it's a multi-threaded application, so pausing the application and analysing the call stack through the debugger is not the most desirable option. I considered freezing different threads one at a time to see if the memory stops reducing, but I'm fairly certain this will cause the application to crash.

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• Classes with the same name - is it restricted only within the same translation unit?

  - by LeopardSkinPillBoxHat

  Let's just I had the following code: foo.h class Foo { // ... }; foo.cpp #include "foo.h" // Functions for class Foo defined here... Let's say that Foo are built into a static library foo.lib. Now let's say I have the following: foo2.h class Foo { // ... }; foo2.cpp #include "foo2.h" // Functions for class Foo defined here... This is built into a separate static library foo2.lib. Now, if I re-link foo.lib and foo2.lib into an executable program foo.exe, should it be complaining that class Foo has been defined twice? In my experiences, neither the compiler or the linker are complaining. I wouldn't be expecting the compiler to complain, because they have been defined in separate translation units. But why doesn't the linker complain? How does the linker differentiate between the 2 versions of the Foo class? Does it work by decorating the symbols?

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• Is it possible to use variables in a ClearCase config spec?

  - by LeopardSkinPillBoxHat

  For example, instead of writing the following: element * .../my_branch_01/LATEST element * .../base_branch/LATEST -mkbranch my_branch_01 I would want to write something like this: MY_BRANCH=my_branch_01 element * .../%MY_BRANCH%/LATEST element * .../base_branch/LATEST -mkbranch %MY_BRANCH% Is this even possible? What is the correct syntax?

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• Problem accessing base member in derived constructor

  - by LeopardSkinPillBoxHat

  Given the following classes: class Foo { struct BarBC { protected: BarBC(uint32_t aKey) : mKey(aKey) mOtherKey(0) public: const uint32_t mKey; const uint32_t mOtherKey; }; struct Bar : public BarBC { Bar(uint32_t aKey, uint32_t aOtherKey) : BarBC(aKey), mOtherKey(aOtherKey) // Compile error here }; }; I am getting a compilation error at the point indicated: error: class `Foo::Bar' does not have any field named `mOtherKey'. Can anyone explain this? I suspect it's a syntactical problem due to my Bar class being defined within the Foo class, but can't seem to find a way around it. This is simple public inheritance, so mOtherKey should be accessible from the Bar constructor. Right? Or is it something to do with the fact that mOtherKey is const and I have already initialised it to 0 in the BarBC constructor?

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