The above will output:
I always seem to be involved with solving many text-data related problems in my VFP projects.
On the surface, handling text isnt very sexy and seemingly not very interesting. I think otherwise, and I hope youll agree. This document is split into three sections: Inbound is about getting text into the VFP environment so you can work with it. Processing is about manipulating the text, and Outbound is about sending text on its way when youre done.
TXT, which along with thousands of works of literature, are available on the web, including here among others. In functional terms, there is no difference between a character field and a memo field.
All functions that work on characters also work on memos. The maximum number of characters that VFP can handle in a string is 16, Inbound This section is all fwrite adds carriage return getting text into your processing environment. Inbound text from table fields To retrieve text from a table field, simply assign it to a memory variable.
Inbound from text files There are many ways to retrieve text from files on disk. This is among my favorite new functions in VFP 6. Its both useful and fast. For example, the following code executes in one-seventh of a second on my Mhz Pentium laptop.
LLFF are also very fast. The following example reads the entire contents of Tolstoys War And Peace from disk into memory: However with the LLFF we also have fine control.
To illustrate, the following code reads the first 15 lines of War And Peace into array wpLines. Lets read, say, bytes about half way through the book.
For example, you may have an HTML file from which you need to clean and remove tags. Or maybe you have the problem exhibited by our copy of War and Peace, which has embedded hard-returns at the end of each line.
How can we create a streaming document that we can actually format? The strategy always works something like this: Youve got a table of records that you can manipulate and transform to your hearts content using VFPs vast collection of functions. Processing This section discusses a wide variety of string manipulation techniques in Visual FoxPro.
Lets say weve got some text in our environment, now lets muck with it. Does a sub-string exist? There are many ways to determine if a sub-string exists in a string.
This command is fast.
The OCCURS function will also tell you if a sub-string exists, and moreover tell you how many times the sub-string occurs. This code will count the number of occurrences of a variety of sub-strings in War And Peace.The ungetc() function pushes the character c (converted to an unsigned char) back onto the input stream pointed to by timberdesignmag.com pushed-back character will be returned by a subsequent read on the stream.
Currently, only a single character can be pushed back onto the stream. Website of Steven Black Consulting. Menu Home. Articles. Text and String Handling in VFP; But if you use carriage return + line feed, CHR(13)+CHR(10), youll get the results you expect. The FWRITE() function dumps all or part of a string to disk.
Strange 0x0D being added to my binary file. Ask Question. up vote 13 down vote favorite. 2.
0A is the line feed character and 0D is the carriage return. These are usually associated with text mode. adds an 0x0D before every 0x0A. In other words, it processes arbitrary data streams as they go to and from store and messes with their .
Solved: I was simulating a JPEG encoder, so I decided to write the encoder output to a RAM and then use the $fwrite command in a loop to write the. IMPORTANT NOTICES: If you have CGIC or earlier, you should upgrade to CGIC , or to CGIC or better, in order to obtain important security fixes.
Why is fwrite writing more than I tell it to? Ask Question. up vote 12 down vote what is going on? write is set to , and I tell fwrite to write that many bytes to a file, which is at the beginning, and then im at a position besides ?
DOS decided to separate the concept of carriage return and line feed while UNIX decided to.