how to load dll file ? "The specified module could not be found." i have refered lot

2012 12 30
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更新时间：2020 2 13
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hai i am using a USB to SPI converter IC(MCP2210) from Micrpchip...they have provided .dll file,I need to load it in to Matlab for working of that chip.
i have tried very hard.....below i have shown editor work i did and message i got...
>> cd('c:\work')
>> hfile = fullfile(matlabroot,'extern','include','matrix.h');
>> loadlibrary('MCP2210DLL',hfile,'mfilename','mxproto')
Warning: Warnings messages were produced while parsing. Check the functions you intend to use for correctness. Warning text can be viewed using: [notfound,warnings]=loadlibrary(...) > In loadlibrary at 344 Error using loadlibrary (line 419) There was an error loading the library "MCP2210DLL" The specified module could not be found.
Caused by: Error using loaddefinedlibrary The specified module could not be found.
i have even tried dependance walker and added the missing file, it dont work. and i have added that .dll file download link below. http://ww1.microchip.com/downloads/en/DeviceDoc/MCP2210_DLL_v1.1.1.zip i need help plz

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 采纳的回答

Friedrich
Friedrich 2013-1-4
编辑：Friedrich 2013-1-4

2 个投票

Hi Ikram,
the main raison why loadlibrary doesn't work is that your DLL is a .NET DLL. So please use NET.addAssembly. Once you use this, its easy going. Please note that you need Windows for this and VERY important: use a 32bit MATLAB or otherwise the DLL can't be loaded.
>> asb = NET.addAssembly(fullfile(pwd,'MCP2210DLL-M.dll'))
asb =
NET.Assembly handle
Package: NET
Properties for class NET.Assembly:
AssemblyHandle
Classes
Structures
Enums
GenericTypes
Interfaces
Delegates
>> asb.Classes
ans =
'MCP2210.DevFunctions_M'
'MCP2210.DevSettings_M'
'MCP2210.DevSpecial_M'
'MCP2210.DllConstants'
'MCP2210.DevIO'
>> MCP2210.DevIO(hex2dec('04D8'),hex2dec('00DE'))
ans =
MCP2210.DevIO handle
Package: MCP2210
Properties:
Functions: [1x1 MCP2210.DevFunctions_M]
Settings: [1x1 MCP2210.DevSettings_M]
Special: [1x1 MCP2210.DevSpecial_M]
Methods, Events, Superclasses
>> ans.Settings.GetConnectionStatus
ans =
0
Good Luck :)

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ikram khan
ikram khan 2013-4-20
i have loaded this .dll file, now i can able to control GPIO pins and configure the Bit rate etc..using this dll functions.
but in final stage after all the configuration, i need to receive the data from MCP2210 chip connected to a ADC. for this, dll have a function TxferSpiData
Name: TxferSpiData Purpose: Transfer the specified SPI data
Parameters:
Inputs: dataTx (array<Byte>^) - Array of SPI data to send to device. This array should be at least the same size as numBytes or larger.
Outputs: dataRx (array<Byte>^) – Array that contains SPI data received. This array should be at least the same size as numBytes or larger. Returns: int - Return value: negative = error 0 = success
i have did the below, when i call the function,no error, and return 0 for success. variable c should have ADC data of 27 bytes loaded into it. but it is not loading.
b=uint8(zeros(1,27));
c=uint8(zeros(1,27));
khan.Functions.TxferSpiData(b,c);
Bolivar
Bolivar 2013-10-31
编辑：Bolivar 2013-10-31
Hi Friedrich,
I also face the same issue when adding NetDocDelegate.dll into MATLAB with fullpath=fullfile('C:','C:\Windows','NetDocDelegate.dll') NET.addAssembly(fullpath) command. Matlab generate an error going like this : the system cannot find the specified file. I have searched my drive for NetDocDelegate.dll, no presence of such a file!!! what should i do? I am actually using a 64 bits version of MATLAB(2013Ra)Student version.
may someone help me? thanks bolivar

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更多回答（3 个）

Kaustubha Govind
Kaustubha Govind 2013-1-3

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ikram khan
ikram khan 2013-1-3
编辑：ikram khan 2013-1-3
Thank u for the Replay
i have tried dependency walker, no dll is missing and it showing two errors in txt file in last line.....i have attached that text file generated by dependancy walker and the screen image of it.....since there is no option to upload in this page....so i have uploaded the to following URL.....(this is in google drive,it can be oped just by cliking it or copy and use)
https://docs.google.com/open?id=0Bws2MsjT5CWcWnRJbzNSRlV0MDQ or
www.cancerhelpline.in/math replay.rar (from my domine space)
(this url contain error report of Dependancy walker and screen image)
the dll is in this link..
http://ww1.microchip.com/downloads/en/DeviceDoc/MCP2210_DLL_v1.1.1.zip
i have also added the dll file url from Microchip website....mostely i tried every thing in web(installed all complier,checked dependancy ect..)t
i am working on my BE final year project. it is very importent for me plz help.
if can plz generate and give me protofile,to use the dll.... ikramkhan11692@gmail.com
Kaustubha Govind
Kaustubha Govind 2013-1-4
Ikram: Sorry, this forum is really for voluntary participation of MATLAB users, so most of us don't have a lot of time to spend on questions posted here - it will help if you can post specific questions that those of us with expertise can contribute best to. I briefly went through your log, and at the bottom, I see:
Error: Modules with different CPU types were found
This might be key - perhaps you have mixed 32-bit and 64-bit DLLs? Your DLL and its dependencies need to be the same type as your MATLAB application.

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ikram khan
ikram khan 2013-1-5

0 个投票

Thank u very much Kaustubha Govind and Friedrich..its working in 32bit matlab

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