c++ - How to convert QString in Qt5 to LPCSTR in Visual Studio 2013 -


I got this question (unhealthy in my case): Most of you probably will consider copying, but I think It is related to different QT / VS / C ++ version or there is no correct answer of the bus (despite some it has been marked).

I have this code, which uses Qt5 in Visual Studio 2013 on Windows 7, C + uses all the proposed solutions in the associated answer: 

 < Code> QString test = "Hello World"; // 1 LPCSTR lp1 = _T (test.toLocal8bit (.) ConstData ()); // 2 LPCSTR lp2 = _T (test.toUtf8 (). ToStdString () .c_str ()); // 3 LPCSTR lp3 = _T (test.toLatin1 (). ToStdString () .c_str ());  
 
 produces 
 
 îþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþç'Û} ÆS2¹úººú 
  
  •  
     produces 
     
     îþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþFþš 
     
    •  
  •  
     production 
     
     îþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþFþš 
     
    •   
     how do I change this?

    Thanks to HuntsMan @ irc.freenode.net I found the right solution: 

      Caststring Test = "Hello World"; QByteArray test_ar = test.toLocal8 bit (); LPCSTR lp2 = _T (test_ar.constData ()); The problem was that a copy of QByteArray was deleted from the stack, as soon as I got out of that line of code, so I passed the Parent LPCRR by pointing out the memory removed. having had.

    Comments

    Post a Comment

    Popular posts from this blog

    python - Overriding the save method in Django ModelForm -

    I'm having trouble overriding a ModelForm save method. I get this error I'm: Exception type: TypeErier Exception Value: Save () found an unexpected keyword argument 'committed' My intentions include a form 3 fields Submit several values ​​for, then create an object for each combination of those areas, and to save each object file models.py class collarsult type (models.Model): id = model. AutoField (db_column = 'icontact_result_code_type_id', primary_key = true) callResult = models.ForeignKey ( 'CallResult', db_column = 'icontact_result_code_id') campaign = models.ForeignKey ( 'campaign', db_column = 'icampaign_id') CALLTYPE = models.ForeignKey ( 'CALLTYPE', db_column = 'icall_type_id') agent = models.BooleanField (db_column = 'bagent', default = true) teamLeader = models.BooleanField (db_column = 'bTeamLeader', default = true) active = models.BooleanField (db_column = Django.form...
    Read more

    html - CSS autoheight, but fit content to height of div -

    I have a div in which there are three children- div in the left and middle div: float: left while true: float: true because it is my layout Actually will spoil, I've used ClearFix Hack: .cf {zoom: 1; }. Cf: First,. Cf: {content: ""; Display: Table; }. Cf: After {clear: both; } It still works, but I want to be the right div an indicator. So it should fill 100% of the parent unit of height. How can I complete this? PS is the full code: & Lt; / Div & gt; & Lt; Div class = "mobile_content" & gt; & Lt; H5 & gt; {{Data.titel}} & lt; / H5> & Lt; Table & gt; & Lt; TR & gt; & Lt; Th & gt; Komponist: & lt; / Th & gt; & Lt; TD & gt; {{Data.komponist}} & lt; / TD & gt; & Lt; / TR & gt; & Lt; TR & gt; & Lt; Th & gt; Instrument: & lt; / Th & gt; & Lt; TD & gt; {{Data.instrumente}} & lt; / TD & gt; & Lt; / TR & gt;...
    Read more

    qt - How to prevent QAudioInput from automatically boosting the master volume to 100%? -

    I have been trying to use Qt5 multimedia to record audio with QAudioInput, however, when I see If QAudioInput is started, it increases the master volume of my sound device to 100%. How can I prevent QAudioInput from changing the master volume? My current development platform is Linux with PalsAdio (with flat audio disabled). How can I use QAudioInput : QAudioDeviceInfo device_info = QAudioDeviceInfo :: defaultInputDevice (); QAudio format format; Format.setSampleRate (44100); Format.setChannelCount (1); Format.setSampleSize (16); Format.setCodec ("Audio / PCM"); Format.setSampleType (QAudioFormat :: SignedInt); Format.setByteOrder (QAudioFormat :: LittleEndian); Std :: cout & lt; & Lt; Device_info.deviceName (). ToUtf8 (). ConstData () & lt; & Lt; Std :: endl; QAudioInput * default_device = new QAudioInput (device_info, format); QIODevice * default_io_device = default_device-> Start (); a QAudioInput.setVolume () method is not you I ...
    Read more