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{ Category Archives } Qt

Another Qt Error: PATH variables in XP

Just to remind myself for next time, when entering variables into windows’ PATH, all entries seperated by a semicolon MUST NOT have a space in between.  If you do then the compiler (mingw32-make) complain about:
‘g++’ is not recognized as an internal or external command

DAQmxReadAnalogF64 Intermittent Warning of 1

I’ve had a very serious problem recently regarding the long term stability of the NI-4462.
Problem:
Everything works fine for about 20-inf secs but then all of a suddent the DAQmxReadAnalogF64 function returns a 1 rather than a 0.
Solution:
The errors were buffer overrun errors (annoying that the 4462 almost always returns 1 as an error. [...]

Another Qt Error

If you ever get the error:
In file included from c:/Qt/4.3.4/include/QtCore/qcoreevent.h:1,
from c:/Qt/4.3.4/include/QtCore/../../src/corelib/kernel/qcoreapplication.h:48,
from c:/Qt/4.3.4/include/QtCore/qcoreapplication.h:1,
from c:/Qt/4.3.4/include/QtCore/QCoreApplication:1,
from src\qpnwsettings.cpp:3:
c:/Qt/4.3.4/include/QtCore/../../src/corelib/kernel/qcoreevent.h:52: error: `QtValidLicenseForCoreModule’ does not name a type
mingw32-make[1]: *** [build/qpnwsettings.o] Error 1
mingw32-make: *** [release] Error 2
This is due to a semicolon not being present at the end of a class definition in a header file when #ifdef and #endif statements are used. [...]

Speed test: c++ vs Matlab - Using Multilateration Routines

Quick update, I wanted to try the matlab vs c++ routines again, because from what I can remember, matlab was several orders of magnitude quicker than the c++ program. But I recently found a library in Qt called QVector, which claims to be very quick on the
whole memory front. So I went back [...]

Qt Errors and Answers

This is a post containing all the problems I had installing and using Qt. Most of them can be fixed quite simply.
Qt:__________________________________________________________
Error: Qt does not compile certain programs on Windows Vista (In my case this was qwt)
Error Code: “gcc: installation problem, cannot exec `cc1′: No such file or directory”
Solution:
to solve the problem, you have [...]