Datatype problem and pointers for a .DLL

7 次查看（过去 30 天）
Torsten Fenn
Torsten Fenn 2015-10-8
回答： Subhamoy Saha 2020-1-20
Hi I have a problem with the following code:
loadlibrary(fullpathToDll, fullpathToHeader)
handlesensor = calllib('MEDAQLib', 'CreateSensorInstance',2) % = SENSOR_ILD1700
calllib('MEDAQLib','SetParameterString',handlesensor,'IP_Interface', 'IF2004_USB');
MATLAB returns an error message in line 3 where I use calllib:
Error using calllib
Array must be numeric or logical or a pointer to one
The code works just fine in C when I use:
hSensor = CreateSenorInstance(2); // = SENSOR_ILD1700
SetParameterString(hSensor, "IP_Interface", "IF2004_USB");
I think the problem is the datatype, but everything I tried did not work. From the documentation I know that the parameters of the function SetParameterString are declared like this:
DWORD handlesensor, LPCSTR paramname, LPCSTR value
I hope you can help me with the information I provided. Thanks!
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Lisa Petzold
Lisa Petzold 2019-8-2
Did anyone find a solution to Torstens Problem?
I am having the same Problem as I am tyring to use the MEDAQLib from Micro-Epsilon to read a sensor from the company.
Thanks a lot!
Petros Neoptolemou
Petros Neoptolemou 2019-12-16
I do have the same issue. Did anyone find the solution, yet?

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回答（2 个）

Subhamoy Saha
Subhamoy Saha 2020-1-20
Yeah! I have returned with an answer this time. The error causes due to declration problem of this line
DWORD handlesensor, LPCSTR paramname, LPCSTR value
You need to follow this format
[ERR_CODE, int8Ptr, int8Ptr] SetParameterString (ulong, int8Ptr, int8Ptr)
Use the following code
loadlibrary(fullpathToDll, fullpathToHeader)
handlesensor = calllib('MEDAQLib', 'CreateSensorInstance',2) % = SENSOR_ILD1700
calllib('MEDAQLib','SetParameterString',handlesensor,int8('IP_Interface'), int8('IF2004_USB'));
Please let us know whether it worked or not.
Subhamoy Saha
Subhamoy Saha 2019-10-30
I have IFD2421 sensor connected over TCP/IP and mine is working fine. You did the same thing and the error should not come. Sorry, I could not help you out but let you know soon if possible.
hSensor =calllib('MEDAQLib','CreateSensorInstance','SENSOR_IFD2421')
calllib('MEDAQLib','SetParameterString',hSensor,'IP_Interface','TCP/IP')

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