MDK-ARM Keil, MDK-ARM Datasheet - Page 53

• Manufacturer Part Number: MDK-ARM
• Description: KIT REALVIEW MCU DEVELOPMENT
• Manufacturer: Keil
• Type: Compiler and IDEr

Specifications of MDK-ARM

• For Use With/related Products: ARM MCUs
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Getting Started: Building Applications with RL-ARM
feof() returns zero until the end of file is reached. Notice, it is possible to read
past the end of a file. While reading or writing data, ferror() reports access errors
in the file stream. Once an error has occurred, ferror() returns the error code
until the file is closed, or until the file pointer is rewound to the start of the file.
fseek(), ftell(), and rewind() position the file pointer within the file. fseek()
moves the file pointer to a location within a file. This location is defined relative
to an origin, which can be the start or the end of the file, or the current file
pointer position. ftell() reports the current location of the file pointer relative to
the beginning of the file. rewind() places the file pointer at the start of the file.
rewind (Fptr);
fseek (Fptr, 4, SEEK_CUR); // Move 4 chars forward rel. to the FP location
location = ftell (Fptr);
Four standard functions exist to write data to a file stream in byte, character,
string, or formatted output format. Similarly, four analogous functions exist to
read data.
while (!feof (Fptr))
}
Exercise: File Handling
This project contains several examples, which demonstrate creating files,
reading and writing data, and managing the data within a file.
Function
fwrite
fputc
fputs
fprintsf
fread
fgetc
fgets
fscanf
byte = fgetc (Fptr);
if (ferror (Fptr))
}
…;
Description
Writes a number of bytes to the file stream.
Writes a character to the file stream.
Writes a string to the file stream.
Writes a formatted string to the file stream.
Reads a number of bytes from the file stream.
Reads a character from the file stream.
Reads a string from the file stream.
Reads a formatted string from the file stream.
{
{
// Place file-pointer at the start of file
// Read the file pointer location
// Error handling
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