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Using GETFULLPATHNAME Win 32 API

 
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wahorger



Joined: 13 Oct 2014
Posts: 456
Location: Morrison, CO, USA

PostPosted: Tue Jan 26, 2016 6:30 pm    Post subject: Using GETFULLPATHNAME Win 32 API Reply with quote

I'm using the WIn32API call to determine the full (not relative) path name to a file. I have that working but ran across something I don't understand when trying to reconcile the MSDN description of the call and the implementation with FTN95.

Specifically, the FTN95 fourth parameter is specified as a 'REF'.
Quote:

STDCALL GETFULLPATHNAME 'GetFullPathNameA' (STRING,VAL,STRING,REF &
&):INTEGER*4

The MSDN description of what should be there is:
Quote:
lpFilePart [out]

A pointer to a buffer that receives the address (within lpBuffer) of the final file name component in the path.

This parameter can be NULL.

If lpBuffer refers to a directory and not a file, lpFilePart receives zero.


I'm trying to understand what this REF actually returns relative to the description given in the MSDN Win 32 API descriptions.

Any ideas?
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mecej4



Joined: 31 Oct 2006
Posts: 941

PostPosted: Tue Jan 26, 2016 7:56 pm    Post subject: Reply with quote

In C terms, the 3rd and 4th arguments are of type LPCSTR and LPCSTR *; the 3rd argument is an address that is known just before calling the Windows function. The fourth argument is the address of an address. The value of *lpFilePart is undefined/immaterial at entry, and Windows returns a pointer in lpFilePart. On the other hand, the value of the third argument must be set at entry and is not changed by the call.
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John-Silver



Joined: 30 Jul 2013
Posts: 887

PostPosted: Tue Jan 26, 2016 10:12 pm    Post subject: Reply with quote

... so it (Ipfilepart or REF) just tells where the file NAME starts ? so it can be retrieved seperately if needed I suppose ?
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JohnCampbell



Joined: 16 Feb 2006
Posts: 1972
Location: Sydney

PostPosted: Tue Jan 26, 2016 11:20 pm    Post subject: Reply with quote

You could just try:
INQUIRE (UNIT=LU5, NAME=INFILE)

With FTN95 this will return the full path name, although this does not with some other compilers.
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wahorger



Joined: 13 Oct 2014
Posts: 456
Location: Morrison, CO, USA

PostPosted: Wed Jan 27, 2016 12:17 am    Post subject: Reply with quote

Thanks.
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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 5459
Location: Salford, UK

PostPosted: Wed Jan 27, 2016 9:23 am    Post subject: Reply with quote

Code:
program myprog
stdcall GetFullPathName 'GetFullPathNameA'(string,val,string,ref):integer
integer r
character(256) buffer
r = GetFullPathName("myprog.exe",256,buffer,core4(0))
if(r > 0) print*, buffer(1:r)
end
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