CAN initializer perameters

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I am doing CAN first time using C++: I am using API function to initialize CAN. Function for API CAN intialization is as following

XML

/// <summary>
/// Initializes a PCAN Channel
/// </summary>
/// <param name="Channel">"The handle of a PCAN Channel"</param>
/// <param name="Btr0Btr1">"The speed for the communication (BTR0BTR1 code)"</param>
/// <param name="HwType">"NON PLUG&PLAY: The type of hardware and operation mode"</param>
/// <param name="IOPort">"NON PLUG&PLAY: The I/O address for the parallel port"</param>
/// <param name="Interrupt">"NON PLUG&PLAY: Interrupt number of the parallel port"</param>
/// <returns>"A TPCANStatus error code"</returns>
TPCANStatus __stdcall CAN_Initialize(
        TPCANHandle Channel,
        TPCANBaudrate Btr0Btr1,
        TPCANType HwType _DEF_ARG,
        DWORD IOPort _DEF_ARG,
        WORD Interrupt _DEF_ARG);

I am not sure about the last 3 parameters what will come here and how to find them
e.g CAN_Initialize(PCAN_NONEBUS, PCAN_BAUD_5K, ??, ??, ?? );

Any help\suggestion please????

Posted 30-Oct-15 4:48am

Ramiien

Updated 30-Oct-15 4:49am

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Jochen Arndt 30-Oct-15 11:43am

I have used CAN too but the answer is obvious:
- If you have a plug&play device just pass zero or omit the parameters.
- If not, the parameters depend on your CAN hardware and should be part of the device documentation.

Ramiien 30-Oct-15 12:02pm

I am using PCAN_USB so it means all parallel parameters would be 0 ??

Jochen Arndt 30-Oct-15 13:35pm

Yes.

When replying to a comment you should use the "Reply" button right of the poster's name like I have done here. Then an email is send upon the new comment. This time it was just by chance that I saw your above comment.

Ramiien 30-Oct-15 17:36pm

Thanks for guidance
I am facing problem in connecting DLL file in my class(myclass.cpp). it is giving me linked crash error "program has unexpectedly finished"
in .pro file i am giving the path of dll file like given below
--------------------------------------------------------------
CONFIG += "C:/mypro/debug/PCANBasic.dll"

and in myclass.cpp file
-------------------------------
#define PCANBasic.h //header file of API

CAN_Initialize(PCAN_USBBUS1, PCAN_BAUD_5K) //function of PCAN_USB API

please guide me in this problem.

Jochen Arndt 31-Oct-15 4:42am

Check first if the DLL has matching dependencies (e.g. requires other DLL with a specific version). These should be documented.

Then you must identify the function that terminates your app. This can be done using debug mode and stepping through your program until the error occurs. Ensure that all function parameters are valid.

In general you should check all function return values for errors.

Ramiien 2-Nov-15 2:55am

I have only one DLL file
I am trying to call PCAN initialize function
CAN_Initialize(PCAN_USBBUS1, PCAN_BAUD_5K);
and setting breaking point at this line it returns me error
"The program has unexpectedly finished" from pcanportlinker.exe
does it means problem is in dll connection or calling function?

Jochen Arndt 2-Nov-15 3:19am

It indicates a problem with the DLL. As already noted check if the DLL can be used with your OS and platform. This information should be provided by the author of the DLL.

You have tagged your question as Embedded so I guess you are using an embedded device with Windows. So you must use a DLL for for your Windows version and platform.

Ramiien 2-Nov-15 4:15am

i am using the correct file because i downloaded the windows package of API from PEAK Systems.
I am configuring the DLL file by static address like below
LIBS += "C:/myDevelopment/PcanLinker/build-PcanPortLinker-Desktop_Qt_5_5_0_MinGW_32bit-Debug/debug/PCANBasic.dll"

is it correct? maybe there could be a problem in path of DLL?

Jochen Arndt 2-Nov-15 4:33am

If the path would be wrong you would get a linker error. But the DLL must be found during run-time by the app. Therefore, it must be located in a common library path or the application directory (where it seems to be).

Searching for your error message it seems to be generated by Qt (see here for example: https://forum.qt.io/topic/18827/solved-the-program-has-unexpectedly-finished/10). So you should go on with debugging to find the problem beacuse it might not be sourced by the DLL.

Once you located the point where the app terminates, check the used Qt functions called before that point for proper parameters.

Ramiien 2-Nov-15 4:46am

I am getting this error screen
The program has unexpectedly finished.
C:\MyDevelopment\build-PcanPortLinker-Desktop_Qt_5_5_0_MinGW_32bit-Debug\debug\PcanPortLinker.exe crashed

I am trying in debug mood and setting breaking point at following line
result = CAN_Initialize(PCAN_USBBUS1, PCAN_BAUD_250K); // to initialize pcan

Jochen Arndt 2-Nov-15 4:54am

If you set the break point to that line, the error has occured before (the break point will stop the program just before it executes any of the code on the break point location).

Ramiien 2-Nov-15 5:01am

line 19: result = CAN_Initialize(PCAN_USBBUS1, PCAN_BAUD_250K); // to initialize pcan
line 20: breaking point

Now getting error
File not recognized:file format not recognized
C:\MyDevelopment\build-PcanPortLinker-Desktop_Qt_5_5_0_MinGW_32bit-Debug\debug\Pcanbasic.dll
it seams accessing DLL file successfully but problem is something else??

Jochen Arndt 2-Nov-15 5:27am

It seems that the file format is unknown. But that is a different error message than before (why is that not shown anymore?).

It is a typical linker error message that would be issued by the linker and not when running the program.

If it is issued by the linker, then see these two links:
https://www.peak-system.com/forum/viewtopic.php?f=41&t=1295
http://www.peak-system.com/forum/viewtopic.php?f=119&t=1196

Ramiien 2-Nov-15 7:11am

Nothing works
Now again previous error
The program has unexpectedly finished.
C:\MyDevelopment\build-PcanPortLinker-Desktop_Qt_5_5_0_MinGW_32bit-Debug\debug\PcanPortLinker.exe crashed

I have one confussion that my MinGW debuger is 32 Bit(as you can see above..) and my system is 64 bit. does it matters? And which DLL file i need to use 32 bit or 64bit?? in my API i have 2 dll folders Win32 and x64.

Jochen Arndt 2-Nov-15 7:22am

It does not care that your system is 64-bit when building a 32-bit application.

When you build a 32-bit app, you must of course use also the 32-bit debugger and load 32-bit DLLs.

But to avoid having multiple errors you should exclude parts and check if all is OK. So uncomment any calls to the DLL and check if you can compile and run the app without errors (I still believe that there is Qt error).

When all is OK proceed with the DLL.

But read the links I have posted in my previous comment. You must use LoadLibrary() and GetProcAddress(). The second link has an example attached as ZIP file.

Because your current problems are not related to the original question, it may be better to raise a new question once you have located a single problem. Than also others here may help.

Ramiien 2-Nov-15 8:29am

without DLL call application is running without warning. while with when call DLL functions it gives following warnings in compile output
Warning: resolving _CAN_Initialize@20 by linking to _CAN_Initialize
Use --enable-stdcall-fixup to disable these warnings
Use --disable-stdcall-fixup to disable these fixups
Warning: resolving _CAN_GetErrorText@12 by linking to _CAN_GetErrorText

Jochen Arndt 2-Nov-15 8:42am

The linker has some problems with the DLL. You may search the net or raise a new question about these messages.

Do you use LoadLibrary() and GetProcAddress() meanwhile?

Ramiien 2-Nov-15 9:36am

i used loadlibrary as following
HMODULE hMod = LoadLibrary(PCANBasic.dll);

it returns me error PCANBasic was undefined. it seems its defination is missing. I dont know how to define this?

Jochen Arndt 2-Nov-15 9:50am

The name is passed as string and must be enclosed by double quotes:
HMODULE hMod = LoadLibrary("PCANBasic.dll");

Did you download the FuncGen-Source.zip example from http://www.peak-system.com/forum/viewtopic.php?f=119&t=1196?

It shows you how to use LoadLibrary() and GetProcAddress().

Ramiien 2-Nov-15 10:08am

Yes but in sample app it is without extention
g_i_DLL = LoadLibrary("PCANBasic");
and this also means dll file is in the same folder where this cpp file is??

Jochen Arndt 2-Nov-15 10:39am

See here: https://msdn.microsoft.com/en-us/library/windows/desktop/ms684175%28v=vs.85%29.aspx
When no extension is specified, .DLL is used. When no path is specified, the DLL is searched in the path of the application first.

Ramiien 3-Nov-15 4:48am

Finally i get some success to access DLL file. using Loadlibrary() and GetProcAddress()
https://www.c-plusplus.net/forum/128715-full
I have no words for Thanks.
Thanks I really appreciate your help and assistance. Danke

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Ramiien · Answer 1 · 2015-11-02T23:26:00

Solution 1

to access DLL file. use Loadlibrary() and GetProcAddress()

for example check this link
https://www.c-plusplus.net/forum/128715-full

Posted 2-Nov-15 23:26pm

Ramiien