National Instruments USB 6002 read data in Qt Creator
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NI has a lot of tutorials on how to use the DAQmx drivers.
For example look at http://www.ni.com/tutorial/5409/en/#toc3 -
ok.
Can you give me a small example just to check the that DAQ lib is working in Mingw. Its important for me. I am not doubting your intelligence but i want to know how i can use it in a code, i havnt work on this kind of project earlier and have to idea how to do that. Pleas help.
@rockon209 said in National Instruments USB 6002 read data in Qt Creator:
Can you give me a small example just to check the that DAQ lib is working in Mingw
To use a 3rd party library in a Qt-based project, you need to tell your *.pro file where to find the library's headers, and where to find the library's binaries.
The simplest way is to add the paths straight into your *.pro file:
INCLUDEPATH += "C:/Program Files (x86)/National Instruments/NI-DAQ/DAQmx ANSI C Dev/include" LIBS += "C:/Program Files (x86)/National Instruments/NI-DAQ/DAQmx ANSI C Dev/lib/msvc/NIDAQmx.lib"Then, in your *.cpp file, just include the library header and call its functions:
// main.cpp #include <QApplication> #include <QWidget> #include <QDebug> #include <NIDAQmx.h> int main(int argc, char **argv) { // Initialize a usual Qt application QApplication app(argc, argv); QWidget w; // Initialize DAQmx and read analog input (Copied and simplified from // http://www.ni.com/tutorial/5409/en/#toc3 ) TaskHandle taskHandle = 0; int32 samplesReceived = 0; float64 data[1000]; DAQmxCreateTask("MyTask", &taskHandle); DAQmxCreateAIVoltageChan(taskHandle, "Dev1/ai0", "", DAQmx_Val_Cfg_Default, -10.0, 10.0, DAQmx_Val_Volts, NULL); DAQmxCfgSampClkTiming(taskHandle, "", 10000.0, DAQmx_Val_Rising, DAQmx_Val_FiniteSamps, 1000); DAQmxStartTask(taskHandle); DAQmxReadAnalogF64(taskHandle, 1000, 10.0, DAQmx_Val_GroupByChannel, data, 1000, &samplesReceived, NULL); DAQmxStopTask(taskHandle); DAQmxClearTask(taskHandle); // Print results qDebug() << "Received" << samplesReceived << "points"; for (int i = 0; i < samplesReceived; ++i) qDebug() << data[i]; // Run Qt event loop w.show(); return app.exec(); }The example code above does not contain any error handling. You must add it yourself.
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@rockon209 said in National Instruments USB 6002 read data in Qt Creator:
I ran the code you have mentioned above, it ran successfully
OK, that means your Qt application successfully linked to the NI DAQmx library.
and got output as "Received 0 points."
That means you didn't manage to acquire any data from the device.
Modify the code to print the return value of every
DAQmx*function call. The return value will be 0 if the call succeeded, or non-zero if there was an error.qDebug() << "Error code for DAQmxCreateTask():" << DAQmxCreateTask("MyTask", &taskHandle); qDebug() << "Error code for DAQmxCreateAIVoltageChan():" << DAQmxCreateAIVoltageChan(taskHandle, "Dev1/ai0", "", DAQmx_Val_Cfg_Default, -10.0, 10.0, DAQmx_Val_Volts, NULL); ...(For example, maybe your device is not called "Dev1", so the call to
DAQmxCreateAIVoltageChanfailed.)Anyway, you now need to learn how to use the NI DAQmx library to interact with your device. That is beyond the scope of the Qt forum. I suggest you continue at the National Instruments forum: https://forums.ni.com/t5/Multifunction-DAQ/bd-p/250 Introduce yourself and say that you are trying to program DAQmx in C/C++.
Good luck!
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@JKSH Thank you so much for your help, it means a lot. One final question if the Qt application did not get linked to the NI DAQmx library then, i would have got the errors because of the use of various function like DAQmxCreateTask.... is it correct?
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@JKSH Thank you so much for your help, it means a lot. One final question if the Qt application did not get linked to the NI DAQmx library then, i would have got the errors because of the use of various function like DAQmxCreateTask.... is it correct?
@rockon209 said in National Instruments USB 6002 read data in Qt Creator:
@JKSH Thank you so much for your help, it means a lot.
You're welcome :)
After you create a thread in the other forum, do post a link here, so that anyone else who wants to use Qt to drive NI devices can follow your discussions.
One final question if the Qt application did not get linked to the NI DAQmx library then, i would have got the errors because of the use of various function like DAQmxCreateTask.... is it correct?
Correct. If your code can't link to the library, then your *.exe won't be created. MinGW will complain something like "Undefined reference to 'DAQmxCreateTask' "
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@rockon209 said in National Instruments USB 6002 read data in Qt Creator:
I ran the code you have mentioned above, it ran successfully and got output as "Received 0 points."
Does it means its working? I dont understand.
I mean to say what should be the output of the code?I just had a thought: Was your USB-6002 plugged into your computer when you ran the program?
I tried it with Qt 5.6.2 (MinGW 4.9.2) + a USB-6003, and this is what I got:
Received 1000 points -0.0971611 -0.0978048 -0.0984484 -0.0987703 -0.0994139 -0.0994139 -0.100058 -0.100701 -0.100701 -0.100701 -0.101023 -0.101023 -0.101345 -0.101345 -0.101667 -0.101667 -0.101989 -0.101667 -0.101989 -0.101989 -0.102632 -0.102632 -0.102632 -0.102632 -0.102954 -0.102632 -0.102954 -0.102632 -0.102954 -0.102954 -0.102954 -0.103276 -0.102632 -0.103276 -0.103276 -0.103276 -0.103276 -0.103276 -0.103276 -0.10392 -0.103598 -0.103276 -0.103276 -0.103276 -0.10392 -0.103598 -0.104241 -0.103276 -0.103276 -0.10392 -0.103598 -0.103598 -0.10392 -0.103276 -0.103276 -0.103276 -0.103276 -0.102954 -0.103276 -0.102954 -0.102632 -0.102954 -0.102954 -0.102632 -0.101989 -0.10231 -0.102632 -0.101989 -0.101667 -0.101667 -0.101667 -0.101667 -0.101667 -0.101023 -0.101023 -0.101023 -0.101023 -0.100701 -0.100701 -0.100379 -0.100701 -0.100701 -0.101023 -0.100701 -0.100701 -0.100379 -0.100701 -0.100379 -0.100701 -0.100379 -0.100701 -0.100701 -0.100701 -0.100701 -0.100701 -0.100701 -0.100379 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because I didn't connect any input signals.
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@JKSH Yes the device is plugged into the computer. But when i see in the NI Measurement and automation explorer its not detected. I read some where if you have USB3.0 drivers then its not detecting the earlier format devices (even it is connected to USB1.0 or USB 2.0) not sure though what is the problem.
I got thisReceived 0 points
Error code for DAQmxCreateTask(): 0
Error code for DAQmxCreateAIVoltageChan(): -88302
Error code for DAQmxCfgSampClkTiming(): -200477
Error code for DAQmxStartTask(): -200478
Error code for DAQmxReadAnalogF64(): -200478
Error code for DAQmxStopTask(): 0
Error code for DAQmxClearTask (): 0 -
@JKSH Yes the device is plugged into the computer. But when i see in the NI Measurement and automation explorer its not detected. I read some where if you have USB3.0 drivers then its not detecting the earlier format devices (even it is connected to USB1.0 or USB 2.0) not sure though what is the problem.
I got thisReceived 0 points
Error code for DAQmxCreateTask(): 0
Error code for DAQmxCreateAIVoltageChan(): -88302
Error code for DAQmxCfgSampClkTiming(): -200477
Error code for DAQmxStartTask(): -200478
Error code for DAQmxReadAnalogF64(): -200478
Error code for DAQmxStopTask(): 0
Error code for DAQmxClearTask (): 0@rockon209 said in National Instruments USB 6002 read data in Qt Creator:
@JKSH Yes the device is plugged into the computer. But when i see in the NI Measurement and automation explorer its not detected. I read some where if you have USB3.0 drivers then its not detecting the earlier format devices (even it is connected to USB1.0 or USB 2.0) not sure though what is the problem.
...
Error code for DAQmxCreateAIVoltageChan(): -88302Error -88302 seems to be related to driver problems: http://digital.ni.com/public.nsf/allkb/19E7993CF8366EED8625764200771C68?OpenDocument
Anyway, your issue is definitely under National Instruments territory. I suggest you re-install your DAQmx drivers (preferably the latest version), and if you're still having issues, ask at the NI forum.
Error code for DAQmxCfgSampClkTiming(): -200477
Error code for DAQmxStartTask(): -200478
Error code for DAQmxReadAnalogF64(): -200478See http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/01d50d3f86ee67d8862576cf00745e78/$FILE/NI-DAQmxErrorCodes.PDF -- Errors -200477 and -200478 mean that DAQmx is complaining that you have no devices or channels.
Once you fix error -88302, these should go away.
(Final note: Since you are getting meaningful error codes from the DAQmx functions, this is further proof that your Qt application has successfully linked to the DAQmx library)
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@JKSH It was the problem with NI software and uninstall the full software and install it again and now it works.
I have one more question i want to read the digital Input signal and i am using "DAQmxReadDigitalU16" function to read but i am not getting the ouput
i am getting following error:-
The program has unexpectedly finished. -
@JKSH or anyone else how many experience in this field, I have encountered a similar issue to the one you have described in your previous posts. I have copied the sample code you posted above and have done extensive research, yet I am still receiving an error "Undefined Reference to DAQmxCreateTask' and so on for all my DAQmx commanddseventhough I have explicitly defined how the library is connected to the project in the project file as you have described in your previous post with the include path and library path. My paths also match yours exactly so I am incredibly confused on where this error is coming form. I have attached my source code, do you think you could take a quick look at what may be going wrong.
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@JKSH or anyone else how many experience in this field, I have encountered a similar issue to the one you have described in your previous posts. I have copied the sample code you posted above and have done extensive research, yet I am still receiving an error "Undefined Reference to DAQmxCreateTask' and so on for all my DAQmx commanddseventhough I have explicitly defined how the library is connected to the project in the project file as you have described in your previous post with the include path and library path. My paths also match yours exactly so I am incredibly confused on where this error is coming form. I have attached my source code, do you think you could take a quick look at what may be going wrong.
Hi @smanchineella,
some questions:
- which compiler are you using?
- which architecture, 32 or 64 bit?
- where is the file
NIDAQmx.liblocated on your computer?
Regards
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This post is deleted!
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Hi @smanchineella,
some questions:
- which compiler are you using?
- which architecture, 32 or 64 bit?
- where is the file
NIDAQmx.liblocated on your computer?
Regards
@aha_1980 I am using the default compiler which came with qt (I believe it is MinGW-64 bit). Both the compiler and my pc are both 64 bit. The NIDAQmx.lib file is located at C:\Program Files (x86)\National Instruments\NI-DAQ\DAQmx ANSI C Dev\lib\msvc\NIDAQmx.lib
Please let me know if you see any issues with how it is setup on my pc. Any suggestions are greatly appreciated!
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@aha_1980 I am using the default compiler which came with qt (I believe it is MinGW-64 bit). Both the compiler and my pc are both 64 bit. The NIDAQmx.lib file is located at C:\Program Files (x86)\National Instruments\NI-DAQ\DAQmx ANSI C Dev\lib\msvc\NIDAQmx.lib
Please let me know if you see any issues with how it is setup on my pc. Any suggestions are greatly appreciated!
Hi @smanchineella,
...\lib\msvc\NIDAQmx.libsuggests that this is an import library for MSVC compiler. It does not say if that import library is for 32 or 64 bit. Both can be a problem.In principle, you cannot mix MSVC and MinGW compiler, so you will either need to switch to MSVC too, or find an include lib for MinGW.
Also, make sure both have the same bitness, otherwise it will likely also fail.
Regards
Qt has to stay free or it will die.
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Hi @smanchineella,
...\lib\msvc\NIDAQmx.libsuggests that this is an import library for MSVC compiler. It does not say if that import library is for 32 or 64 bit. Both can be a problem.In principle, you cannot mix MSVC and MinGW compiler, so you will either need to switch to MSVC too, or find an include lib for MinGW.
Also, make sure both have the same bitness, otherwise it will likely also fail.
Regards
It does not say if that import library is for 32 or 64 bit
Based on the installation folder
C:\Program Files (x86)\National Instruments\...under Windows 64 bit, we can assume it's a 32 bit version of the library.@smanchineella as @aha_1980 mentioned please pay attention at the compiler and bitness of the library you're trying to use.
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It does not say if that import library is for 32 or 64 bit
Based on the installation folder
C:\Program Files (x86)\National Instruments\...under Windows 64 bit, we can assume it's a 32 bit version of the library.@smanchineella as @aha_1980 mentioned please pay attention at the compiler and bitness of the library you're trying to use.
@Pablo-J-Rogina @aha_1980 When I downloaded the NIDAQmx file from the NI website, it said it includes both 32 and 64 bit import library depending on the bitness of the computer and the compiler. However, based on your both replies, how would I go about installing a 32 bit MSVC library and linking that in?
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Hi @smanchineella,
...\lib\msvc\NIDAQmx.libsuggests that this is an import library for MSVC compiler. It does not say if that import library is for 32 or 64 bit. Both can be a problem.In principle, you cannot mix MSVC and MinGW compiler, so you will either need to switch to MSVC too, or find an include lib for MinGW.
Also, make sure both have the same bitness, otherwise it will likely also fail.
Regards
@smanchineella said in National Instruments USB 6002 read data in Qt Creator:
I am using the default compiler which came with qt (I believe it is MinGW-64 bit).
The online Qt installer provides both 32-bit and 64-bit versions of MinGW. There is no default; you select the one you want to install.
You must install 3 things:
- A compiler
- Qt libraries
- DAQmx libraries
All 3 things must have the same bitness, and the Qt libraries must match your compiler.
@aha_1980 said in National Instruments USB 6002 read data in Qt Creator:
In principle, you cannot mix MSVC and MinGW compiler, so you will either need to switch to MSVC too, or find an include lib for MinGW.
The compiler for NIDAQmx.lib doesn't really matter because it is a C library, not a C++ library.
@smanchineella said in National Instruments USB 6002 read data in Qt Creator:
how would I go about installing a 32 bit MSVC library and linking that in?
You already have 32-bit DAQmx libraries. Now you need a 32-bit compiler and matching 32-bit Qt.
- Download the 32-bit MSVC compiler from Microsoft: https://visualstudio.microsoft.com/vs/features/cplusplus/
- Run MaintenanceTool.exe in your Qt folder and install Qt 5.15.2 for MSVC2019 (32-bit)
Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches
