Re: .def file library name

"Giovanni Dicanio" <giovanniDOTdicanio@REMOVEMEgmail.com> ha scritto nel
messaggio news:usTgcOKVJHA.5424@TK2MSFTNGP04.phx.gbl...


Matt Pietrek's article really helped.

So, I built a function to get the "internal" DLL name produced at build-time
(which can be different from the filename).

You can use the function GetInternalDllName (in DllInspector namespace) in
code like this:

<code>

    // Get internal DLL name
    DllInspector::ErrorCodes result = DllInspector::GetInternalDllName(
        dllFilename, dllInternalName );
    if ( result == DllInspector::Success )
    {
        printf("Internal DLL name is: %s\n", dllInternalName.GetString());
    }
    else
    {
        printf("Error %d\n", result);
    }

</code>

The body of the function is shown here, and I attached the complete source
code (including the DllLoader class implementation, the header file and a
test file) in this post.
It seems to work, at least in my simple tests.

<code>

//========================================================================
// Function to get the "internal" DLL name, given the DLL filename.
//========================================================================
ErrorCodes GetInternalDllName(
    IN LPCTSTR dllFileName,
    OUT CStringA & dllInternalName )
{
    // Clear output argument
    dllInternalName.Empty();

    // 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_EXPORT_DIRECTORY
structure
    IMAGE_OPTIONAL_HEADER * optionalHeader = &ntHeaders->OptionalHeader;
    IMAGE_DATA_DIRECTORY * dataDirectory = &optionalHeader->DataDirectory[
IMAGE_DIRECTORY_ENTRY_EXPORT ];
    IMAGE_EXPORT_DIRECTORY * expDirectory = reinterpret_cast<
IMAGE_EXPORT_DIRECTORY * >(
        (DWORD)dosHeader + dataDirectory->VirtualAddress);

    // Access the ASCIIZ string of DLL name using the RVA
    const char * pszDllName = reinterpret_cast< const char * >( ((BYTE
*)hInstance) + expDirectory->Name );

    // Store the internal DLL name in the output parameter
    dllInternalName = CStringA( pszDllName );

    // All right
    return Success;
}

</code>

HTH,
Giovanni

begin 666 TestDllInspector.zip
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