495
edits
Changes
Switched to Syntax Highlighting
==Example Code==
==Example Code==
<tt>
<syntaxhighlight lang=objective-c>
- (BOOL)readFile:(NSString *)filename returnError:(NSMutableString *)errorString
- (BOOL)readFile:(NSString *)filename returnError:(NSMutableString *)errorString
{
{
unsigned long i;
unsigned long num_lines, num_rows, lines_to_skip;
unsigned long row,column;
FILE *fp;
[errorString setString:@"no error"];
fp = fopen([filename cStringUsingEncoding:NSASCIIStringEncoding],"r");
// set up a line buffer
LineBuffer *line = NewLineBuffer(1000);
// how many lines in the file
num_lines = CountLinesInFile(line,fp);
// count lines rewinds the file, so we're back at the beginning..
lines_to_skip = NUM_HEADER_LINES;
num_rows = num_lines – lines_to_skip;
// skip the header lines, if they exist
for (i=0;i<lines_to_skip;i++) GetNextLine(line,fp);
// read in all the rows and columns
column = 0;
for(row=0;row<num_rows;row++) {
if (GetNextLine(line,fp)) {
while (GetNextTabField(line, tabtext)) {
SetRowColumnText(row,column,tabtext);
column++;
}
}
}
// all the rows have been read in
// done reading from the file, so dispose of file stuff
fclose(fp);
DisposeLineBuffer(line);
return(TRUE);
}
}
</tt>
</syntaxhighlight>
==LineBuffer data structure==
==LineBuffer data structure==
<syntaxhighlight lang=objective-c>
typedef struct {
unsigned long max; // maximum size of the line (i.e. size of buffer pointed to by text)
char *text; // the buffer that contains the last line read from the file
char *textptr; // for internal use; a ptr to the start of the next tab field
char *textend; // for internal use; a pointer to the end of the line
unsigned long length; // the length of the line, ie. the number of characters that were read in from the file
char *buffer_ptr; // points to start of next line in a buffer -- initialized by SetBuffer
unsigned long buffer_size; // the total number of characters in the buffer -- initialized by SetBuffer
} LineBuffer;
</syntaxhighlight>
==Routines==
==Routines==