C# Examples of GPIB Programming without Measurement Studio

I am trying to find examples of programming a gpib instrument with C#, but without Measurement studio. I am trying to cross the managed/unmanaged barrier and do not want to take any unnecessary performance hits.

Hello,
There is a very good reference on the functions that you can call for GPIB in C or C++. Once you have installed the 488.2 driver, if you go to Windows»Start»Programs»National Instruments» NI-488.2 »NI-488.2 Help.
It will contain all the functions that you can use.
Here I attached a C code for LabWindows/CVI which contains also some functions for a front panel. The important thing is to see how you use the ibdev, or ibwrt or ibrd commands.
Basically what you need is the functions I just mentioned.
You can find more examples in the Developer Zone. Look for CVI examples for GPIB and will be matter of just reading the C code.
Best Regards,
Ricardo Santa Olalla
National Instruments.
Attachments:
gpib.txt ‏9 KB

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Programming NI 6527 with VB 6.0 only without measurement studio

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Regards,
Kyle M.
Applications Engineering
National Instruments

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But, how to creating a multi-channels analog output task, and had a different frequence in each channels?
Thanks.

This is getting to be a common question!
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John Weeks
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Phone (503) 620-3001
Fax (503) 620-6754
www.wavemetrics.com

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I have programmed a visual basic application using activex controls. WHen I run this application through internet, it appears a message box indicating that the measurement studio is a demo, but I have the correct license. What can I do?

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Have you included the lpk file with your control? I've attached the tool you'll need and here is a nice link that goes thru it step by step.
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Attachments:
lpk.zip ‏74 KB

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hello! i hope you can help me with my problem
im using:
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greetings A.Herman

Hello SG_ENGINEER,
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Attachments:
Continuous_Analog_Out_Update_Sinewave.vi ‏100 KB

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"If NI could just stick an example of exactly how to use VB.NET with measurement studio on displaying data and the various options available and stick it for all to see on the measurement studio home page it would be great."
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"I write in over ten different languages and scripts and fluent in two of them. It worries me that I can't even find the front door let alone open it."
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Application distribution Measurement studio

We have now developed a software application using Measurement Studio and VC++ for "capturing" live communication data from line as step 1 of the application and "analysing data" separately as step 2. We can do the 2 steps without any problem on a data acquisition machine. However, when we run the same application on a desktop PC (not a digitizer or not connected to digitizer) we expect the application to RUN only step 2. The question here is then, in order to set application up on a desktop PC (not a digitizer or not connected to digitizer) what changes I should do (in terms of un-tying NI scope acquisition functions)?
NI Software : Measurement Studio for Visual C++ version 7.0
NI Hardware : High-Speed Digitizers (Scopes) device PXI-5122
Driver Version : NI Scope 2.6
OS : Windows XP

THanks for response.
>>> Aha, I didnt realize that you were using the C++ scope classes. The scope driver does not >>> get loaded until the very first call to the scope class. So you would not need to setup >>> delay loading nor would you use LoadLibrary or GetProcAddress.
Our application was developed using MFC VC++ 2003 .NET edition. Sorry I missed the details.
>>> You will get an exception when you use the CNiScope constructor and if the system does >>> not have the scope driver installed.
Exactly, I do get an exception when I use the CNiScope constructor. However, what I do is create CNiScope 2 times. The first time a dummy construction is done with function like this...
bool CMainFrame:copeExists(void)
bool scopeExists = true;
CString errorMsg = "NiScope device absent.\r\nNo Scope controls will be available";
try
// Instantiate a scope to test is it exists
CNiScope ProbeScope ("PXI1Slot2", false, false, "");
catch (CNiIviException* e)
e->Delete();
AfxMessageBox (errorMsg, MB_OK | MB_ICONEXCLAMATION);
scopeExists = false;
return scopeExists;
I use the returned boolean to identify if scope driver is PRESENT or ABSENT in the system. Using this boolean result I then do the actual scope dialog bar and CNiScope construction (the second time is when the actual CNiScope is created and used).
If boolean is FALSE
no scope dialog bar controls is created
only the analyses dialog bar controls are created
else
application starts up with scope and analyses dialog controls
>>> Are you using the .NET class libraries? Or is this just MFC code?
Just MFC code with Measurement Studio
>>> For a list of components that need to be distributed, refer to the Measurement Studio Help topic Distributing Measurement Studio Visual C++ Applications.
This was helpful to the extent that I got the active X controls loaded and distributed with application. But analyses part of application crashes when it tries to use the CNi such as CNiMatrices, CNiReal64Vector. I found this using the debugged in Microsoft's VC++ .NET 2003.
>>> Are you checking for exceptions when you start the analysis routines?
I do have a few exceptions being checked. However, can you tell the exceptions you have in mind that need to be included.
>>> Is this crash happening on the development machine or the deployment machine?
The crash is happening only on machines NOT having scope drivers. I tried on a 2 machines.
One WITH Measurement Studio and WITHOUT scope controls - it crashes
Second WITHOUT Measurement Studio and WITHOUT scope controls - it crashes
Is there something I am missing??
>>> Could you provide more information about the crash, perhaps a code snippet or a sample app ( with only the analysis section).
Here is code snippet....
m_digIntpolRowLength and m_digIntpolCoeffRows are unsigned int types.
m_farrowFilterCoeff is CNiReal64Matrix type. This is the first moment in application when a CNi is used. When the matrix elements are loaded with values, it crashes at the line
m_farrowFilterCoeff(0,0)=0.00252;.....
I know this may or may not give you whole lot of information. If we can go offline from discussion forum (becuase of proprietary information), I can provide more details about application etc. Thanks.
void CDAQ_DigitalInterpolator::ResetLarge(void)
m_digIntpolRowLength = c_digIntpolRowLengthLarge;
m_digIntpolCoeffRows = c_digIntpolCoeffRowsLarge;
m_farrowFilterCoeff.SetSize(m_digIntpolCoeffRows, m_digIntpolRowLength);
m_delayLineBuffer.SetSize(c_delayLineBufferSize);
m_delayLineSize = m_digIntpolRowLength;
m_delayLinePtr = &m_delayLineBuffer[c_delayLineBufferSize - m_delayLineSize];
/////Row 0//////
m_farrowFilterCoeff(0,0)=0.00252;
m_farrowFilterCoeff(0,1)=-0.0087823;
m_farrowFilterCoeff(0,2)=0.0218283;
m_farrowFilterCoeff(0,3)=-0.046127;
m_farrowFilterCoeff(0,4)=0.0909993;
m_farrowFilterCoeff(0,5)=-0.1884611;
m_farrowFilterCoeff(0,6)=0.6283543;

Why can't visual basic 6 load CWDAQ.OCX in the example programs? I am using the latest Measurement Studio 6 and VISTA OS.

Can someone help me with getting controls to work with Visual basic 6 in an Vista environment? I cannot get the examples to work that use the CWDAQ.OCX control. I did a search on my computer and the file is not even there. What functions are in CWDAQ.OCX? Is there a descriptions of what functions are included in this control and other controls? It is not obvious where to find these descriptions.
I did install Measurement Studio 6 with all the options for Visual basic 6.
I am new to programming NI cards with visual basic so any help in getting me started will be greatly appreciated.
I need to talk to a PCI-6110 card in visual basic 6. I would like to preprogrammed the D/A fifos, store to two analog inputs simutaneously, and use some of the digital I/O. Can someone direct me the direction as to what controls I need to use?
Thanks in advance for any help or guidance.
Tony

Hi Tony,
So the reason you can't find the CWDAQ.OCX ActiveX controls in VB 6.0 in Vista is because that is a Tradtional DAQ (legacy) control meant to work with the Traditional DAQ Driver.
The Tradtional DAQ drivers aren't officially supported in Windows Vista (KnowledgeBase 4FDH4MZN: Traditional NI-DAQ (Legacy) for Windows Vista OS) and so the CWDAQ.OCX controls don't get installed.
However, the good news is that the PCI 6110 is a newer card that uses our newer driver, NI-DAQmx. DAQmx is supported in Vista and you can communicate to your card from VB 6.0 using DAQmx in Vista.
There are several examples that show you how to communicate using DAQmx in VB 6.0.
These can be found in:
<Users>\Public\Documents\National Instruments\NI-DAQ\Examples
This is also mentioned in the following Knowledgebase article:
KnowledgeBase 47CCSQ5B: NI-DAQmx, NI-VISA and NI-488.2 .NET Example Locations
Also, the DAQmx functions are documented in the following locations:
Start»Programs»National Instruments»NI-DAQ»NI-DAQmx C API Visual Basic 6.0 Help
Start»Programs»National Instruments»NI-DAQ»NI-DAQmx C Reference Help
Hope this helps!!
Message Edited by Jervin_J on 06-05-2008 02:58 PM
Jervin Justin
NI TestStand Product Manager

Program DAQCard-AI-16XE-50 with Measurement studio

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I have seen so many ways to program an application to transfer data thru GPIB, for example, there are VISA (eg. viClose, viOpen), NI-4882 API (eg. ibdev, ibclear), and CNi4882 (eg. write,read) class from Measurement Studio software. Can u tell me what's the difference between those and when do u use each of those? How they are related/categorized? Is there any caution when using those (eg. can mix or do not mix)? it would be nice too if u could give me some article to read about it. I want to get a big picture of those.
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NI-VISA Help:
http://digital.ni.com/manuals.nsf/websearch/21992F3750B967ED86256F47007B00B3?OpenDocument&node=132100_US
Language Interfaces:
http://zone.ni.com/devzone/devzone.nsf/webcategories/0B47FD0CFA7E3F6E862567F4005AD89C
Please repost if you have further questions.
JenK

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Hello,
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Hi,
I download Measurement Studio 2009 for Visual Studio Evaluation yesterday. I installed it with Labview 2009 and DAQmx 9.2.1. My OS is XP sp3. I have a DAQ card DAQ-6024E. And I tried to output a analog signal using the card. So, I found out there is an example from NI after installation named "GenVoltageUpdate" in the folder \NI-DAQ\Examples\MStudioVC2008\Analog Out\Generate Voltage\. I used VS 2008 to try to run this program in debug mode. There was a box popped up "The Measurement studio evaluation has expired". I checked the Measurement Studio>> License, and it shown as the figure attached. None of them has expired yet.
I don't know why there is such message about expiration. I hope someone can help me.
Thank you very much.
Attachments:
新图片.jpg ‏246 KB

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System.ComponentModel.LicenseException was unhandled
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I tried using the Measurement studio active-X License fixer. In the Licensed controls list there is "3D Graph control 8.0" but in the Elvaluation Licenses list and the Broken Licenses list the is no controls at all.
Is there something else I can do?
Best regards,
Mark

C# Examples of GPIB Programming without Measurement Studio

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