Reading / writing file created by C++ MFC application

[supremisewan]

Hi folks, long time lurker first post here.

Does anyone have any experience of reading & writing a file created by another MFC application?
The application is placing arrays into a file.

Thanks

[Klaus]

Hi supremisewan,

I have no idea what a MFC application is, but here some questions that may help us help you

1. Is this a plain text or binary file?
2. If it is a text file, do you know HOW (format) the arrays are written to that file?
3. Mabe you could post an example of these files here?


Best form germany

Klaus

[supremisewan]

Hi Klaus

Thanks for your quick reply.

MFC is Microsoft Foundation Class libraries. We use the CArchive class (part of mfc) to serialize the objects for the file. The applications are c++ MFC applications.

I know the exact format of the files (there are several different types) all are unicode binary files.
They generally contain a mixture of information, header, filetype (internal version number) Then a series of arrays-
for example a typical basic structure would be -

(index, array(position1, position2, position3), attribute, attribute) (index2, array(position4, position5), attribute, attribute)

Im not even 100% if this will even be possible in revolution without an external, but i have my fingers crossed.





I have figured out how to get rev to read the binary file, and process different types as binary, what is stumping me is how to deal with the arrays.

[mwieder]

Well, if you've figured out how to extract the various binary formats you've already done the hard part <g>. You'll have to do some more reverse engineering to figure out the stored format of the data (whether it's packed, etc), but from that point on it's just a matter of reading a certain number of bytes and converting them. No external necessary.

BTW: Your "basic structure" looks like structs rather than arrays. If that's the case, then "array(position1, position2, position3)" will evaluate to a known type (int, real, etc) and you can go from there.

[supremisewan]

thanks for the replys, really helped!

managed to get the decoding working, now im looking at the encoding side.

Getting there slowly.

I have another question. i need to encode a lat/long pair
using......................

bits-32/1 (Longitude) In WGS.84 in two’s complement.
Range -180 £ longitude < 180 deg.
(LSB) = 180/2 to the power 25 degrees

for example - i have the values 51.770302, -4.061172

am i right in thinking that revolution uses twos complement internally?, and i would be safe enough using--

put binaryEncode ("f*",(tdata[1]*128)) into theLatLong
put binaryEncode ("f*",(tdata[2]*128)) after the last item of theLatLong