Re: .def file library name

"Newsgroupie" <buzbymb@yahoo.co.uk> ha scritto nel messaggio
news:4dac1de3-22e6-4be5-8246-d56a6ea545a6@x38g2000yqj.googlegroups.com...


You can find a new updated version of the source code here:

http://www.geocities.com/giovanni.dicanio/vc/TestDllInspector.zip

and the compiled exe here:

http://www.geocities.com/giovanni.dicanio/vc/TestDllInspector_exe.zip

A sample output is like this:

<output>

Internal DLL name is: TestMyDll.dll

This DLL requires:
#1 USER32.dll
#2 MSVCR90D.dll
#3 KERNEL32.dll
#4 ADVAPI32.dll

</output>

On a simple test, I verified that I get the same results of DUMPBIN.

I defined a new function DllInspector::GetDllDependencies(), that you can
use like this:

<code>

    // Get list of DLL imports
    std::vector< CStringA > dependDlls;
    result = DllInspector::GetDllDependencies( dllFilename, dependDlls );
    if ( result == DllInspector::Success )
    {
        printf("This DLL requires:\n");
        for ( size_t i = 0; i < dependDlls.size(); i++ )
        {
            printf("#%d %s\n", (i+1), dependDlls[i].GetString());
        }
    }
    else
    {
        printf("Error %d\n", result);
    }

</code>

The implementation of the aforementioned function follows (with a structure
very similar to the other function to get the "internal" DLL name):

<code>

//========================================================================
// Call this function to get the names of the DLL's imported by the
// input DLL (given its filename).
//========================================================================
ErrorCodes GetDllDependencies(
    IN LPCTSTR dllFileName,
    OUT std::vector< CStringA > & importList
   )
{
    // Clear output argument
    importList.clear();

    // Access the DLL
    DllLoader dllLoader( dllFileName );

    // NOTE:
    // If the DLL was already loaded in the process, the DllLoader instance
    // can be substituted with a simple call to GetModuleHandle(
dllFileName ), e.g.:
    //
    // HINSTANCE hInstance = GetModuleHandle( dllFileName );
    //
    HINSTANCE hInstance = dllLoader.GetHInstance();
    if ( hInstance == NULL )
    {
        return Error_CantLoadModule;
    }

    // Check DOS signature
    IMAGE_DOS_HEADER * dosHeader = reinterpret_cast< IMAGE_DOS_HEADER * >(
hInstance );
    if ( dosHeader->e_magic != IMAGE_DOS_SIGNATURE )
    {
        return Error_BadDosSignature;
    }

    // Get pointer to main PE header
    IMAGE_NT_HEADERS * ntHeaders = reinterpret_cast< IMAGE_NT_HEADERS * >(
((BYTE *)dosHeader) + dosHeader->e_lfanew );
    // Check the signature:
    // the signature field viewed as text is "PE\0\0"
    if ( ntHeaders->Signature != 0x00004550 )
    {
        return Error_BadPeSignature;
    }

    // Navigate until we find the RVA of DLL Name in IMAGE_IMPORT_DIRECTORY
structure
    IMAGE_OPTIONAL_HEADER * optionalHeader = &ntHeaders->OptionalHeader;
    IMAGE_DATA_DIRECTORY * dataDirectory = &optionalHeader->DataDirectory[
IMAGE_DIRECTORY_ENTRY_IMPORT ];
    IMAGE_IMPORT_DESCRIPTOR * importDescr = reinterpret_cast<
IMAGE_IMPORT_DESCRIPTOR * >(
        (DWORD)dosHeader + dataDirectory->VirtualAddress);

    // Last import descriptor is characterized by all 0s (NULLs)
    IMAGE_IMPORT_DESCRIPTOR lastImportDescr;
    ZeroMemory(&lastImportDescr, sizeof(lastImportDescr));

    bool lastImportDescrFound = false;
    while ( !lastImportDescrFound )
    {
        // Check in case we find the last import descriptor
        if ( memcmp( importDescr, &lastImportDescr,
sizeof(lastImportDescr) ) == 0 )
        {
            // Found the last import descriptor
            lastImportDescrFound = true;
        }
        else
        {
            // Access the ASCIIZ string of DLL name using the RVA
            const char * pszDllName = reinterpret_cast< const char * >(
((BYTE *)hInstance) + importDescr->Name );

            // Store the import DLL name in the output parameter
            importList.push_back( pszDllName );

            // Update import descriptor to next one
            importDescr++;
        }
    }

    // All right
    return Success;
}

</code>

IMHO, I encourage you to try to write the code yourself, to better
understand the techniques used.

HTH,
Giovanni

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