Can call one function, but not the other

This is a discussion on Can call one function, but not the other within the C++ Programming forums, part of the General Programming Boards category; I'm creating a C++ MFC dll using Visual Studio 2005. I can call "CALCCMR" successfully from a dll, but not ...

  1. #1
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    Can call one function, but not the other

    I'm creating a C++ MFC dll using Visual Studio 2005.
    I can call "CALCCMR" successfully from a dll, but not "CALCCLOGP". Here's the code that calls the dll:
    Code:
    // import DLL functions
    typedef long (CALCLOGP)(const char*, float*, long*, HANDLE*);
    typedef long (CALCCMR)(const char*, float*);
    typedef long (CALCXMR)(const char*, float*);
    typedef long (CALCMGVOL)(const char*, float*);
    typedef long (MOL_FILE_IMPORT) (char* inputF, char* outputF);
    typedef double (CLOGP_VIA_MOL) (char* myMol);
    
    static CALCLOGP* calcLogP = NULL;
    static CALCCMR* calcCMR = NULL;
    static CALCXMR* calcXMR = NULL;
    static CALCMGVOL* calcMgVol = NULL;
    static MOL_FILE_IMPORT* mol_file_import;
    static CLOGP_VIA_MOL* clogp_via_mol;
    static HINSTANCE hinstCLogP = NULL;
    static HINSTANCE hinstCopy = NULL;
    In my main function, I follow the directions provided with the 3rd party dll:
    Code:
    //Complete the import of the dll routines
    hinstCLogP = LoadLibrary("bb-clogp.dll");
    hinstCopy = hinstCopy;
    
    calcLogP = (CALCLOGP *) GetProcAddress(hinstCLogP, "calcLogP");
    calcCMR = (CALCCMR *) GetProcAddress(hinstCLogP, "calcCMR");
    calcXMR = (CALCXMR *) GetProcAddress(hinstCLogP, "calcXMR");
    calcMgVol = (CALCMGVOL *) GetProcAddress(hinstCLogP, "calcMgVol");
    mol_file_import = (MOL_FILE_IMPORT *) GetProcAddress(hinstCLogP, "mol_file_import");
    clogp_via_mol = (CLOGP_VIA_MOL *) GetProcAddress(hinstCLogP, "clogp_via_mol");
    The instructions show how to call these function, but leave out/not explain some of the variables being passed. For example, there is no reference to a variable named Smiles. However, this is the value being passed to the dll, so if I hard-code it, it works when I try calcCMR(Smiles, &pCMR):

    Code:
    long err;
    float pCMR;
    
    err = calcCMR("O=C", &pCMR);
    I run this and it compiles fine.

    Here's the example for calculating calcLogp:

    Code:
    float pLogP;
    long err;
    
    long pNumContrb;
    
    // Note: These MUST be GlobalFree( ) 'd after calls to calcLogP
    LogPContribution** pClogPContrb, * pclogp;
    
    
    pLogP = -99.99f;
    pNumContrb = 0;
    
    err = calcLogP(smiles, &pLogP, &pNumContrb, &pClogPContrb);
    
    // smiles holds the smiles string of course.
    // pLogP will have your value if err is less than 60.
    
    // Later you must free as follows...
    //	GlobalFree(pClogPContrb);
    //	GlobalFree(pclogp);
    When I compile this, I get the following errors:
    Code:
    c:\documents and settings\epajn\my documents\visual studio 2005\projects\cfx_clogp\request.cpp(62) : error C2065: 'LogPContribution' : undeclared identifier
    c:\documents and settings\epajn\my documents\visual studio 2005\projects\cfx_clogp\request.cpp(62) : error C2065: 'pClogPContrb' : undeclared identifier
    c:\documents and settings\epajn\my documents\visual studio 2005\projects\cfx_clogp\request.cpp(62) : error C2065: 'pclogp' : undeclared identifier
    There is no other additional information about the type for these variables, and I'm new to C++ so don't know what I'm missing.
    I've tried declaring these variables according to what's being imported, but still get errors. Does anyone have any insight?

  2. #2
    and the hat of wrongness Salem's Avatar
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    > // Note: These MUST be GlobalFree( ) 'd after calls to calcLogP
    > LogPContribution** pClogPContrb, * pclogp;
    You don't specify a type

    It looks like LogPContribution should be a type, but the error message suggests otherwise.

  3. #3
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    That's what I thought, but the types for LogPContribution, pClogPcontrb and pclogp were not provided in the instructions. I tried the following:
    Code:
    float pLogP;
    long err;
    
    long pNumContrb;
    long LogPContribution;
    long pClogPContrb;
    float pclogp;
    
    // Note: These MUST be GlobalFree( ) 'd after calls to calcLogP
    LogPContribution** pClogPContrb, * pclogp;
    
    
    pLogP = -99.99f;
    pNumContrb = 0;
    
    err = calcLogP("O=C", &pLogP, &pNumContrb, &pClogPContrb);
    Here are the errors:
    Code:
    c:\documents and settings\epajn\my documents\visual studio 2005\projects\cfx_clogp\request.cpp(65) : error C2100: illegal indirection
    c:\documents and settings\epajn\my documents\visual studio 2005\projects\cfx_clogp\request.cpp(65) : error C2100: illegal indirection
    c:\documents and settings\epajn\my documents\visual studio 2005\projects\cfx_clogp\request.cpp(71) : error C2664: 'CALCLOGP' : cannot convert parameter 4 from 'long *__w64 ' to 'HANDLE *'
            Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
    c:\documents and settings\epajn\my documents\visual studio 2005\projects\cfx_clogp\request.cpp(71) : error C2664: 'CALCLOGP' : cannot convert parameter 3 from 'float *__w64 ' to 'long *'
            Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
    c:\documents and settings\epajn\my documents\visual studio 2005\projects\cfx_clogp\request.cpp(71) : error C2664: 'CALCLOGP' : cannot convert parameter 1 from 'long *__w64 ' to 'const char *'
            Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
    The directions seem to be missing information, does this sound correct? I want to request clearer directions, but want to make sure the current directions aren't workable.

  4. #4
    Frequently Quite Prolix dwks's Avatar
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    You're passing the function (const char *, float *, long *, long *) and it's expecting otherwise.
    dwk

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  5. #5
    and the hat of wrongness Salem's Avatar
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    I would comment out this line, because it makes no sense
    // LogPContribution** pClogPContrb, * pclogp;

    Also, you need to add comments to your code snippets, because there's no way for us to match line numbers in your error messages to lines of code you post.

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