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C++ File placement

 
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C++ File placement, creating a directory for files
Antiokus
6 Feb, 2007 - 11:33 AM
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I'm working on a program (not homework) at the moment that reads and writes to multiple files. My question is when I create new files (and read from them) is there a way to place/ read from a path instead of the default folder where the .exe is stored?

This post has been edited by Antiokus: 6 Feb, 2007 - 11:33 AM
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Jayman
RE: C++ File Placement
6 Feb, 2007 - 11:52 AM
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Yes, just provide the path with filename to access the file from any folder.

You will need to use two backslashes instead of one so that you will get the correct path. Otherwise you will get errors because the compiler will think you are trying to access an escape sequence that doesn't exist.

For exampe:
CODE

inputStream.open("C:\\Documents and Settings\\Administrator\\Desktop\\myFile.exe");


BTW, how goes it at school?
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horace
RE: C++ File Placement
6 Feb, 2007 - 11:53 AM
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QUOTE(Antiokus @ 6 Feb, 2007 - 07:33 PM) *

I'm working on a program (not homework) at the moment that reads and writes to multiple files. My question is when I create new files (and read from them) is there a way to place/ read from a path instead of the default folder where the .exe is stored?

you have to put the path (relative or absolute) in, e.g. unix
CODE

  outfile.open ("/home/zg/testdata/test.txt",  ios::binary | ios::out);

or in Windows
CODE

  outfile.open ("c:\\zg\\testdata\\test.txt",  ios::binary | ios::out);
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Antiokus
RE: C++ File Placement
6 Feb, 2007 - 11:55 AM
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Awesome, thanks!

I must have messed up trying it. I kind of figured that you could just give it a path name.

Eh, it's going alright. Luckily we got a few good guys this quarter. Your old computer is now the "hang out" spot for William and everyone, so Dan is going to try sitting out there one day and see how that works to keep them in line.

Must make ITT look even better, right?
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Antiokus
RE: C++ File Placement
6 Feb, 2007 - 12:03 PM
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OK looks like I need a little more help here:

fout.open(user.c_str());

that's what I was originally using to create the file (user is a string).
How do I append a directory onto that? Could I just concat the value of user into a string that holds the entire path name?
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Jayman
RE: C++ File Placement
6 Feb, 2007 - 12:07 PM
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Yes, or you could concatenate inside the fout.open constructor.
CODE

fout.open("C:\\Documents and Settings\\Administrator\\Desktop\\" + user.c_str());
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Antiokus
RE: C++ File Placement
6 Feb, 2007 - 12:14 PM
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its not liking concat inside of fout.open():

"invalid operands of types 'const char[62]' and 'const *char' to binary 'operator+'"
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horace
RE: C++ File Placement
6 Feb, 2007 - 12:41 PM
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QUOTE(Antiokus @ 6 Feb, 2007 - 08:14 PM) *

its not liking concat inside of fout.open():

"invalid operands of types 'const char[62]' and 'const *char' to binary 'operator+'"

you concatenate the strings then extract the char * for open(), e.g.
CODE

  string filename="test.txt";
  outfile.open (("c:\\zg\\testdata\\" + filename).c_str(),  ios::binary | ios::out);
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Jayman
RE: C++ File Placement
6 Feb, 2007 - 12:49 PM
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Whoops, I forgot parenthesis. Thanks for the correction horace.
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Antiokus
RE: C++ File Placement
6 Feb, 2007 - 12:54 PM
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Sure enough, working perfectly

thanks guys.
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