Invalid type in dll but I don't see the error

Question

CAPL_DLL_INFO4 table[] = {
{CDLL_VERSION_NAME, (CAPL_FARCALL)CDLL_VERSION, "", "", CAPL_DLL_CDECL, 0xabcd, CDLL_EXPORT },

  ... 
  {"dllTEST",(CAPL_FARCALL)GetAttribute,"CAPL_DLL","...",'I', 5, "IIICI", "\001\001\001\100\001",{ "x","x","x","x","x" } },
  ...

{0, 0}
};
CAPLEXPORT CAPL_DLL_INFO4 far * caplDllTable4 = table;

This is my CAPL Export Table in the sourcefile, which is written in c++ and compiles without errors or warnings to a *.dll. The function interface looks like this in my definition and prototype:

int CAPLEXPORT far CAPLPASCAL GetAttribute(int16 a, int16 b, int16 c, char d[], int16 e);

After successfully implementing the *.dll into CANoe, I get the compile error in CANoe:

CAPL node 'ECU 1': Compilation of '..\ecu.can' failed with error(s)
Invalid type in DLL ..\abc.dll, function dllTEST.

Am I missing something obvious? The used types in the function are all finely casted to CAPL conform types, in this pdf on page 15 you can read about the error:

This error is caught while compiling a CAPL program. The function defined in the CAPL Export Table is incorrect. Most of the time it is the parameter settings in the CAPL Export Table.

Are you using Microsoft Visual C++? – sergej Jul 11 '16 at 19:14 — sergej, Jul 11 '16 at 19:14

sergej · Accepted Answer · 2016-07-11T19:19:41.140

According to the "Implementing and Integrating CAPL DLLs" manual, your function declaration and the function table should look something like this:

long CAPLEXPORT far CAPLPASCAL GetAttribute(long a, long b, long c, char d[], long e);

CAPL_DLL_INFO table[] = {
    {CDLL_VERSION_NAME, (CAPL_FARCALL)CDLL_VERSION, CAPL_DLL_CDECL, 0xabcd, CDLL_EXPORT},
    ... 
    {"dllTEST", (CAPL_FARCALL)GetAttribute, 'L', 5, "LLLCL", "\000\000\000\001\000"},
    ...
    {0, 0}
};

unsigned long CAPLEXPORT __cdecl caplDllGetTable(void)
{
    return (unsigned long)table;
}

Explanation

Since only the 4-th parameter (d) is an array (1-dimensional), the Array Depth Definition is:
```
"\000\000\000\001\000"
```
Do not use int16. Use the types described in Table 3 (Function Parameter And Return Value Data Types). Since int and char can only be used if array size !=0, we are using long.

Invalid type in dll but I don't see the error

1 Answers1

Explanation