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file i/o

Posted on 2000-05-13
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Last Modified: 2010-04-02
heres my delema, ive got the name of a file in a string, not including the directory.  What i need to do is open that file but it is in another directory for example here is a senario...

char file[20] = "filename.txt";
FILE * file2 = fopen(("//dir//%s",file),"w");

but alls that does is open the file in the current directory...

Thanks for any help...
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Question by:beyonddeath
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4 Comments
 
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nietod earned 240 total points
ID: 2807614
The "C" way of doing this would be.

char Path[256];
char Location = "\\Dir\\";
char File[20] = "filename.txt";

strcpy(Path,Location); // Get the location.
strcat(Path,File); // Add on the file name.

FILE *File2 = fopen(Path,"w");

continues.
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LVL 22

Expert Comment

by:nietod
ID: 2807619
(I should also mention that for more complex formating, you could use sprintf() to create the "final" string, but in this case, a strcpy() and strcat() are sufficient, and probably more efficient than sprintf().

However, the best way to handle this is to move to C++.  In C++ you should almost always use string classes instead of C-style (character array)  strings.  These are far safer and far easier to use.  You could write uour own or use the STL string class, or a string class from another source.  Similarly you should use the C++ file stream objects (fstream) in place of C I/O streams.  These are also far safer and more powerful than C I/O streams.

for example;

string Location = "\\Dir\\";
string File = "filename.txt";
string Path = Location + File;
ofstream File2(Path.c_str());
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Author Comment

by:beyonddeath
ID: 2808320
Thats what i thought just couldnt remember the functions strcpy and strat ;)

THANKS
0
 

Author Comment

by:beyonddeath
ID: 2808346
works great as long as winsock will send stuff right always that 50/50 chance of it not sending what i tell it too stupid stupid stupid but this loads everything great!
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