How to put_value of input file item in Upload form

Hi,All:
In my VC6 APP, I need to input image file name into form of
upload webpage, but I failed to put value. I do it with following
fragment code
I have get <input type="file" ...> pointer spInputElement;
.......
CComDispatchDriver spInputElement
vVal="strpicturefile";
spInputElement.PutPropertyByName(L"value", &vVal);

the file input item get nothing .

tks in advance
victor

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