Library node error on _stdcall(winapi)

hello i have developped a labview program to read pic18f4550 data and display it following several steps i have called the .dll file provided by microchip containing the functions to close read write and open usb data paths the problem i am experiencing is in the library function node where everytime i swith to C insteadd of _stdcall i get no data but if i use _stdcall i get an error in labview i have double checked the variables and cant fix it:s or get it to work (i have tried a c# example taken from the internet and it worked) (i am using proteus virtual usb in my simulation)
thank you
Attachments:
mp_USBopen.vi ‏28 KB
mpusbapi.h ‏19 KB
mp_USBopen.zip ‏24 KB

You can find the difference between _stdcall and C call for dll here
http://digital.ni.com/public.nsf/allkb/7253D2F0D91F68058625752F005AB672
Kind regards,

Similar Messages

Call Library node error [1]

Hi,
I've written a program to control the angular position by using PID control algorithm.
The program works fine but after certain amount of time. The system hanged and need to shut down the LabVIEW and restart.
The warning message pop up is showing in the attached file.
One more question, is it the PCI-6221 M-series card can used for real-time application.
Just for your information, I'm using:
- LabVIEW 7.1
- PCI-6035E
The program is attached to the message "Call Library node error [2]"
Thanks.
Best regards,
IANES
Attachments:
Error11.bmp ‏405 KB

Hi,
It would be very helpful if you could post the code you are using to generate this error. These call library errors can be caused by many things.
Check out the following KnowledgeBases:
http://digital.ni.com/public.nsf/websearch/0120D13E4B4C94BB86256A3F007695EE?OpenDocument
http://digital.ni.com/public.nsf/websearch/58596F5D41CE8EFB862562AF0074E04C?OpenDocument
-Sal

Getting error in call library node when establishing communication with MAX1452 on serial port using dll

I want to communicate with MAX1452 in labview on PC serial port. Maxim provides dll file which has functions to communicate with device.It says first two functions should be findcom port and initialization sequence where findcom port returns PC's serial port address while initialization sequence helps device to learn baud rate.Iam not getting exception error in call library node.i have kept dll file in the same location as VI.

Labview verison is 7.1 and os is win xp.
The data types are according to the dll functions defined in functions definitions( attached previously).
I'd put dll in the same directory where the code resides.
Attachments:
Code.vi ‏23 KB

Call library node in builded exe - path problem

Hi!
I have builded an EXE with the App. Builder. In my application I use the Call Library Node, and call functions from a DLL.
I give the path of the dll with the "Current VI path", than strip the path, and add the DLL-s name. So in the CallLibNode I check the "specify path on diagram" option.
It works when I run my application on a PC that has the LV 8.5 installed.
But when I install my app on a PC that does not have it, just my setup installs the Runtime Engine onto it, it does not work, and I get errors.
Which is the proper way to give the DLL-s path, if I want my app run on any PC that does not have LV installed?
Thanks:
Waszil

Does the executable run correctly on the development machine? If not I would imagine it is a problem with how you are referencing the dll.
Have you installed all necessary support libraries you may be using throughout the program on the target machine? Are you able to confirm that the error messages are referencing to the dll not being found?
It sounds like you are referencing the dll correctly. When compiled, the dll is put into the 'data' directory within the root directory, so make sure that is there on the target pc
Message Edited by yenknip on 08-04-2008 10:42 AM
- Cheers, Ed

Call library node - using a structure with dll

Hi folks.
I was hoping to recieve some help or advice on solving this problem I am having in labview:
Some background info - I am trying to use the 'call library node' to allow me to use a .dll to allow for control of a remote power supply over RS-232.
I have been doing fine up till now, however I am now trying to use the following:
int TC4GetFnBlockSettings(struct T_FnBlock *p_fnblock, unsigned int type)
int TC4SetFnBlockSettings(struct T_FnBlock *p_fnblock, unsigned int type)
where
struct T_FnBlock
unsigned int BaseFunction;
double Amplitude;
double Offset;
double Symmetry;
double Frequency;
int BipolarAmplitude;
int RectifyAmplitude;
double ExpTimeConstant;
unsigned int NumPeriods;
unsigned int UserDefAmplitude;
unsigned int UserDefTimePrescaler;
double UserDefPeriodLength;
unsigned int UserDefNumPoints;
unsigned int InactiveLevelType;
double InactiveLevel;
unsigned int AAPInputType;
unsigned int AAPInputFilterKoeff;
unsigned int AAPFlags;
double AAPInputScaling;};
Obviously there is no such thing as a structure in Labview; I had hoped to use a cluster in it's place however the CLN does not allow for input or output of a cluster.
Any help would be appreciated!
Thanks
Solved!
Go to Solution.

Akiel wrote:
unfortunalty the call library node doesnt map labview types to c types very well. It can be done but took me a lot of time and effort (and overworking google) to manage it. In the end i abandoned the cln and write a c# code that interfaces between my dll and labview.
sorry cant be of much more help.
I think NI need to improve this functionality as the CLN could be useful but hard to get working on anything beyond a simple dll interface
That is not true!
The Call Library Node does a tremendous job in providing configuration options to map LabVIEW data to most C datatypes. In most cases the two match directly except when arrays and strings are concerned. Those two are very different in LabVIEW than in C but the Call Library Node allows to configure parameters to map LabVIEW strings and arrays to according C string and array pointers.
A structure in C is directly equivalent to a LabVIEW cluster unless it contains strings or arrays. Also there is the potential of structure element alignment which you have to take care of explicitedly but that is hardly the fault of LabVIEW but rather a direct consequence of the rather low level character of the C language.
Since the OPs C struct only contains scalar datatypes you can directly create a LabVIEW cluster with the same elements and the same order of elements and pass that cluster to the Call Library Node parameter configured as Adapt to Type.
The reason that you might have to get google overworked for such things is not because LabVIEWs support for interfacing to C code is bad, but because interfacing to C code is such a complex topic in itself. Without a lot of low level knowledge about what a C compiler really does when creating functions you are bound to do a lot of trial and error and googling. You get the same issue when trying to interface unmanaged code in C# (.Net).
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Exeception caused by Call Library Node

I'm getting a serious error with LV DSC 7.1. I was making some changes to the scf file but when I went to save it I got the following error.
An exception occurred within the external code called by a Call Library Node. This may have corrupted LabVIEW's memory. You should save any work to a new location and restart LabVIEW. VI "dsc_DYN_TAInitDB.vi" was stopped at Node 0x48B4 of subVI "dsc_InitTagGroupsDB.vi"
When I restarted LV the error message appeared straight away and I could not start the Tag Configuration Editor. I have since tried repairing and reinstalling the DSC module. This let me get back into the TCE but I still got the error when I tried to save the SCF file. I thought the scf file may have been corrupt so I exported the data to a txt file and imported it to a new file but I still get the same error on saving.
I've just finished a complete reinstallation of LV, drivers and DSC module. When I open the TCE for the first time I created a new scf and and again imported the tag info from the txt file but again when I went to save it I got the error.
There are over 150 tags in the scf for an ethernet FieldPoint system. The PC is running XP Pro. The application was recently upgraded from V7.0 to 7.1. Everything was running fine until the edits to the scf. However, this was not the first edit to the scf I had made.
The knowledgebase contained details of a similar error for LV 6.1 and there were updated drivers available. Is there any ubdates for LV 7.1?

Hi Rob,
Thanks for your reply. However, I tried the uninstall, registry clean, reinstall as described but I still got the same error when I tried to save the scf after importing the tags from the text file. The error makes it impossible to open the Tag Configuration editor unless I uninstall and reinstall the dsc module which makes it very time consuming to even try anything different.
For now I'm going to go back to V7.0. I've attached the scf file and the exported tag data which I tried to import.
Thanks again
Paul
P.S It appears that .scf is not a valid extension for an attachement so I had to zip it.
Attachments:
Outside Test Rig.zip ‏4 KB
OTR Channel Tags 18-05-06.txt ‏63 KB

Call Library Node; enum structure

I suspect that I already know the answer to this. But is it possible to pass in the following defined structure to the call library node from labview:
struct HStradisDecoder {
unsigned long hHandle;
typedef struct HStradisDecoder* STRADISDECODER;
Thoughts and Ideas?
Using LabVIEW 8.0+
Paul <--Always Learning!!!
sense and simplicity.
Browse my sample VIs?

Hi Paul,
First I'd get Guenter's suggestion working - it should work! (and would make the parameter-passing very simple.)
Without knowing anything about the larger application it's difficult to guess why it didn't work. Is the hHandle the correct value? Does the "endian-ness" of hHandle change from caller (LabVIEW) to callee (DLL)? - it might be necessary to reverse the byte-order of the U32/hHandle.
Attached is an example of a VI that calls a WinAPI (User32.dll) function. The last two parameters to the DLL are non-trivial structures - passed and unpacked as arrays!
I stuffed the diagram with lots of prototypes, descriptions and links from MSDN - enjoy.
Cheers!
Message Edited by tbd on 08-16-2007 01:30 AM
"Inside every large program is a small program struggling to get out." (attributed to Tony Hoare)
Attachments:
Launcher.vi ‏145 KB

SO Wait causes exception occurred within external code called by call library node

when trying to run some old code that used to work ok, i now get this error message:
exception occurred within external code called by call library node
and the vi flagged as calling the exception is SO Wait. the error occurs with different soundcards. does anyone know what is causing this problem?

Hi Kreuters
It sounds as if you have a case of memory corruption. Which version of LabVIEW and DAQ (traditonal or DAQmx) are you running and also on which operating system?
would it be possible for you to post your VI on this thread? in some cases there are ways to fix the problem
Regards
YatinM
NIUK

Call Library Node

Hi,
I have experienced some problem (refer to my attachment) in running my LabVIEW program as an EXE file. However, such error did not appear when the program in running as llb format. I suspect it has something to do with the configuration of the Call Library Node.
Please kindly advice. Thanks
LCM
Attachments:
error_vi.bmp ‏681 KB

Jack J. wrote:
Have you tried
recreating the EXE. It might just be a problem of VI corruption. Also
try copying the dll that you are using into the same directory as the
executable. Again, these are general suggestion. Since the message says
that the error is occuring within the dll, it might be something more
than just the configuration of the call library node. If you want to send me the dll and example program, I can try it out here. Regards, Jack J.
Applications Engineer National Instruments
That
sort of errors almost always means either a wrong Call Library Node
configuration or setup or a bad DLL itself. The fact that it doesn't
crash in the development environment is just bad luck and I really mean
here BAD. Since the application has a different runtime setup (no edit
features of the devlopment environment and such and smaller VI code)
the chances that a bad memory access corrupts some vital data for
LabVIEW are different and most often higher. Your DLL still corrupts
memory even in the development environment but happens to do so by
chance in an area LabVIEW doesn't care for that particular application.
A seemingly small change to the VIs could change that at any time and
make your program crash even in the development environment. Check out
the call library node and make sure you have configured everything
accordingly. A common error here could be that the DLL expects a string
or array buffer of a specific size and you pass in a to small string or
array. Even a single byte such as for the terminating zero character of
strings can be and sooner or later will be already fatal here.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Why does the DLL function executed by call library node fail when the Vi is re-opened?

Development System
OS: Windows XP
LabVIEW: version 10.0
DLL: Custom
Compiler: Visual C++ 6.0
Function Prototype: __declspec(dllexport) const char * test(void)
We have developed a DLL for use. The DLL compiles cleanly.  The DLL includes a function test.  The test function validates the functional capabilities of the DLL. I have followed the examples online, and I have used the import shared library tool in LabVIEW. The VIs created use the call library node.
When I create a VI calling the test function from the custom DLL using the call library node the VI executes the DLL function test flawlessly. I close the VI. When I re-open the VI and run it, I get an error code from the DLL.  However, if I go to the block diagram and set the path for the DLL in the configure call library node again then the VI executes the DLL function test flawlessly again.
I have to set the path for the DLL in the configure call library node every time I open the VI. The examples I downloaded from the community do not require this. What might the DLL be missing? What am I missing?
Solved!
Go to Solution.

I think it was rather unfair of me to ask for help with my DLL issue without disclosing more detailed information. As a corrective action, I have attached a zipped file. The zipped file contains the entire VC++ 6.0 project for compiling the DLL, the DLL, and the VI I have been using to test it.
###NOTE####
As a prerequisite to compilation and usage of the DLL you'll need to have installed Python 26 on your system.
You may obtain the MSI for correct version of Python from the following location:
http://www.python.org/ftp/python/2.6.6/python-2.6.6.msi
###NOTE###
Thank you very kindly for any assistance offered!
Thanks,
Bill
Attachments:
C_DLL_PYTHON_AND_LABVIEW2010.zip ‏1685 KB

LM2902 "not enough nodes" error

I'm using Multisim 11.0.278.
I designed an EQ circuit that includes the model LM2902N. The first time I tried to simulate it, the netlist generator complained that the model should have a node called "VS-", but the netgen couldn't find it because it's actually called "GND".
I renamed the GND pins VS- and saved the corrected model in my User component library. Then I replaced the old LM2902s with the new one.
Now, when I try to simulate, I get a different error saying "not enough nodes found" in the LM2902.
How do I fix this?
The schematic in question is attached.
Attachments:
EQ.ms11 ‏262 KB

replacing the LM2902N components in your circuit with the equivalent in the database gave me no netlist issues and solved any that were in your circuit.
The likely cause of your current issue is the model mapping. If the model nodes are not properly mapped within the model tab of the component, you will get the not enough nodes error.
This can be fixed by going to.
1) Tools > Database > Database Manager
2) Locate you component in the components tab and select "Edit" (the component needs to be in your user or corporate database)
3) Once in the model tab of the component editor, ensure the table is shown.
If there are any pins showing NC, that is likely the cause of the not enough nodes found error. You will need to add the mapping for the NC node.(the order depends on the model in use and is usually written at the top of the model)

Debug gives non-exect.,Call Library Function: no library specified error?

I have installed the VISA 2.6 as mentioned in order to be able to see the VIs for my TDS5104 scope. The VIs are still not exectuable because of this library function call. I have followed all instructions pertaining to the labview add on, etc. I have the tektronix drivers installed. How do I fix this error so that I can actually program my specific solution?

Hi,
I looked for the instruments driver at www.ni.com/idnet and found NI Instrument Drivers Network: TDS 5054 Multi-Environment Plug and Play Instrument Driver for the instrument. This driver is developed by Tektronix.
I don't have the driver available, but it is most likely that the Library node VIs can not find the dll. Go to the VIs that are not executable, right click on the library call node and select configure. Note the path and the name of the dll the node is configured to use. You can then look for the dll in your system. You have 2 options: change the path in the node to point at the location of the dll or copy the dll to the location the node is expecting to find it. Any of
those should make the node executable.
Hope this helps.
DiegoF
National InstrumentsMessage Edited by Molly K on 02-18-2005 11:02 PM

Included DLLs path, call library node

Hi,
somebody handed me a DLL I want to use (specifically, from compiled with
matlab) in Labview. The problem is that the DLL has dependencies upon the
matlab c math library functions.
So in Labview I can add a call library node for the dll, but it still
complains about not finding the matlab library functions. What do I need to
do to let Labview know where I have these libraries stored?
-joey

It sounds like your LabVIEW code is successfully calling your .dll It is then the .dll's responsbility to find the files it needs, and ideally the documentation with the .dll or with Matlab should answer this question. After LabVIEW calls your .dll, the code in the .dll is the code in charge of what happens. There is a good chance that the .dll is only programmed to find the files it depends on at a given relative or absolute path which is no longer correct wherever you have copied it to.. if you control the code for the .dll, particularly the error message, this is a good reason to have the file not found error message explain where it was trying to look (i.e. be specific)
If this program is something you just need to run and not distribute, maybe you should just
browse for the .dll from the Call Library node in the location where Matlab creates it... if it doesn't even work there, you will definitely need to find out how the Matlab .dll is supposed to work.
If you can call a .dll from Matlab, try moving it and then calling it from Matlab again, and check whether any Matlab environment path settings are being used or assumed in the .dll code.
Good luck

I tried downloading the new update for itunes I get these error messages: Visual C runtime library R6034 an application has made an attempt to load the C runtime library incorrectly Error 7 windows error 1114. What should I do to correct this?

I tried downloading the new update for my desktop PC I get the following error messages:
Visual C++ Runtime library
R6034
an application has made an attempt to load the C runtime library incorrectly Error 7 Windows Error 1114

Click here and follow the instructions. You may need to completely remove and reinstall iTunes and all related components, or run the process multiple times; this won't normally affect its library, but that should be backed up anyway.
(99907)

When im trying to download itunes it keeps saying application has made an attempt to load the c runtime library incorrectly error 7 windows error 1114 can anyone help me

When im trying to download itunes it keeps saying R6034 application has made an attempt to load the C runtime library incorrectly error 7 windows error 1114

This forum is for questions from those managing sites on iTunes U, Apple's service for colleges and universities to post educational material in the iTunes Store. You'll be most likely to get help with this issue if you ask in the general iTunes for Windows forum.
Regards.

Library node error on _stdcall(winapi)

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