[solved] QHash's insert() wrong use? --> VS-Debugger showed botch data due to missing Qt-Addon for VS
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and here you have the log of my myDataController from the Watch window:
@- myDataController {myQHash={...} } DataController
- myQHash {d=0x003d35a0 e=0x003d35a0 } QHash<int,DataItem *>
- d 0x003d35a0 {fakeNext=0x00000000 buckets=0x003d35d8 ref={...} ...} QHashData *
- fakeNext 0x00000000 {next=??? h=??? } QHashData::Node *
- buckets 0x003d35d8 QHashData::Node * *
- ref {_q_value=1 } QBasicAtomicInt
size 2 int
nodeSize 12 int
userNumBits 4 short
numBits 4 short
numBuckets 17 int
sharable 1 unsigned int
- e 0x003d35a0 {next=0x00000000 h=4011480 key=4011480 ...} QHashNode<int,DataItem *> *
- next 0x00000000 {next=??? h=??? key=??? ...} QHashNode<int,DataItem *> *
next CXX0030: Error: expression cannot be evaluated
h CXX0030: Error: expression cannot be evaluated
key CXX0030: Error: expression cannot be evaluated
value CXX0030: Error: expression cannot be evaluated
h 4011480 unsigned int
key 4011480 int - value 0x00000001 {dataID=??? dataName={...} dataCat=??? ...} DataItem *
dataID CXX0030: Error: expression cannot be evaluated - dataName {d=??? } QString
d CXX0017: Error: symbol "" not found
dataCat CXX0030: Error: expression cannot be evaluated
dataCon CXX0030: Error: expression cannot be evaluated
@
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Ah ok, let me make this clear:
I have a in form of --> QHash<qint32, DataItem*>
DataItem has a few simple attributes int, QString see class.Then I push key-value pairs on that QHash
@myDataController->addNew(2512, "Work", 20482, 1272963);@
by generating a new DataItemObject by those parameters and store
<2512, DataItemGeneratedFrom_2512_Work_20482_1272963>Then my DataController, which contains my QHash, should store these values in there. As in the example above following values shoule be (2512, "Work", 20482, 1272963), but according to my WatchWindow in debug mode, there are other (not the one I entered above) values in there (see first post and picture in second post).
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[quote author="ZapB" date="1309869796"]Indeed. I suggest writing unit tests for your classes.[/quote]
I have never done this before. VS --> Test --> New test... --> Create new
then I shall insert test logic: @ [TestMethod]
void TestMethod1()
{
//
// TODO: Add test logic here
//
};@Any tutorials? Hints? Todos?
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Hmmm, I am not sure of how to do it with Visual Studio. I use the QtTest framework that ships with Qt. With that you create a sub-project that gets compiled as an application that tests your particular class (you have to write the tests of course). Take a look at the "docs":http://developer.qt.nokia.com/doc/qt-4.7/qtestlib-manual.html#id-df520d0c-f4d5-40a0-a379-b016eb2962a1 for an introduction to QtTest and also a "turorial":http://developer.qt.nokia.com/doc/qt-4.7/qtestlib-tutorial.html#id-286e4ba0-d890-4d30-bb60-4e3e70f88401
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Yes unit testing is a bind and extra work but it pays dividends as your unit tests can be used to catch regressions much more easily than your production code (assuming your tests are sufficient and hat you actually run them of course).
Striking the balance is up to the author.
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[quote author="ZapB" date="1309872749"]Yes unit testing is a bind and extra work but it pays dividends...[/quote]
Yes this is an issue, I am willing to learn. But not yet. I would be appreciated if anybody can recommend an effective Turtorial or Book regarding Test units with C++ / Qt.
Back to my problem. Seem to be solved!
I work with Visual Studio, but without the Qt-addon. SO I 've heard that VS's Debugger somtimes can not interpret Qt typical objects. In real, everything seem be alright, but the debugger shows botched data.I inserted a
@
const DataItem * DataController::getDataItem(qint32 key) const
{
const DataItem * tR = NULL;
QHash<qint32, DataItem>::const_iterator itf = this->myQHash.find(key);
if(itf != maQHash.end()) tR = &itf.value();
return tR;
}
@
I checked myDataController s entries:
@
myDataController.addNew(2511, tr("Heim"), 20481);
myDataController.addNew(2512, tr("Work"), 20482);
const DataItem *tP1 = myDataController.getDataItem(2511);
const DataItem *tP2 = myDataController.getDataItem(2512);
@
every values in tP1 and tP2 are interpreted correctly.
So there was much ado about nothing?Is it recommended to install the Qt-addon for VS?
However, I like to thank everyone for your patience.
Cheers Huck
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Yes or use Qt-creator for Qt projects instead of MS Visual Studio. I switched and am very glad that I did.
There is not much to unit tests beyond what is covered in the docs I linked above. They just take time to write - often just as long as the class under test if you cover everything.
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Glad to hear it worked out in the end!
If you really want to use Visual Studio as your IDE, I would definitely recommend installing the Qt Visual Studio Addin. But then, I cannot really see any good reason for using Visual Studio for Qt development at all. Qt Creator is IMO a much nicer IDE in pretty much every aspect, even for pure C++ development without Qt. But that's (at least partly) a matter of taste, I guess. -
[quote author="huckfinn" date="1309876721"]
Back to my problem. Seem to be solved!
I work with Visual Studio, but without the Qt-addon. SO I 've heard that VS's Debugger somtimes can not interpret Qt typical objects. In real, everything seem be alright, but the debugger shows botched data.
[/quote]This add on also adds some additional info to the debugger file autoexp.dat which is used by the debugger to exand classes ti user readable stuff. If those additions are missing, it is hard to read Qt classes...
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[quote author="ZapB" date="1309876995"]Yes or use Qt-creator for Qt projects instead of MS Visual Studio.[/quote]
I use onyl QtCreator, when developing at home. At work, I also would like to develop with Qt Creator, but the Projects are for VS as they told me.
It is a big project; which I had to generate with cmake2.8.
In cmake I only could select VS 6, 7, 8, 9 etc. Eclipse CDT, CodeBlocks, and some other IDEs etc.
But no QT :(If there is a way to export that project for Qt, please let me know. Thank you!
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Qt-creator has cmake project support. From memory just open qt-creator then go to File->Open File or Project and choose the CMakeLists.txt. You will then be asked by the import wizard to choose a build location etc. Qt-creator will then run cmake for you and populate the project tree etc. Give it a try and see how you get on.