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Re: "pointers" for calling a DLL

by chinman (Monk)
on Feb 11, 2003 at 13:37 UTC ( #234395=note: print w/replies, xml ) Need Help??

in reply to "pointers" for calling a DLL

Hey, thanks to everyone for your help so far...I think I'm almost there. I can get the methods that reference either longs or doubles to work.

I'm still having problems with any method requires a pointer to a string. I am referring to the usage under the dispinterface IXRawfile in the OLEview. For the GetFileName method it is:

[id(0x00000003), helpstring("method GetFileName")] void GetFileName(BSTR* pbstrFileName);

Now if I look in the user documentation for the library it says that "the pbstrFileName variable is a valid pointer to a BSTR variable. This variable must exist and be initialized to NULL." My question is, does this bit of code initialize this variable to NULL? I can't see any reason why this should not work...dang.

my $filename = Variant(VT_BSTR|VT_BYREF, 0);

Thanks, chinman

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Re^2: "pointers" for calling a DLL
by Solo (Deacon) on Feb 11, 2003 at 13:51 UTC
    The manual says:

    my $filename = Variant(VT_BSTR|VT_BYREF, VT_NULL);
    Without precise calculations we could fly right through a star or bounce too close to a supernova and that'd end your trip real quick, wouldn't it?

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