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16-Bit Language Tools Libraries
freopen
Description:
Include:
Prototype:
Reassigns an existing stream to a new file.
<stdio.h>
FILE *freopen(const char * filename , const char
* mode , FILE * stream );
Arguments:
filename
mode
stream
name of the new file
type of access permitted
pointer to the currently open stream
Return Value:
Remarks:
Example:
Returns a pointer to the new open file. If the function fails a null pointer
is returned.
The function closes the file associated with the stream as though
fclose was called. Then it opens the new file as though fopen was
called. freopen will fail if the specified stream is not open. See fopen
for the possible types of file access.
#include <stdio.h> /* for fopen, freopen, */
/* printf, fclose, */
/* FILE, NULL */
int main(void)
{
FILE *myfile1, *myfile2;
int y;
if ((myfile1 = fopen("afile1", "w+")) == NULL)
printf("Cannot open afile1\n");
else
{
printf("afile1 was opened\n");
if ((myfile2 = freopen("afile2", "w+",
myfile1)) == NULL)
{
printf("Cannot open afile2\n");
fclose(myfile1);
}
else
{
printf("afile2 was opened\n");
fclose(myfile2);
}
}
}
Output:
afile1 was opened
afile2 was opened
Explanation:
This program uses myfile2 to point to the stream when freopen is
called so if an error occurs, myfile1 will still point to the stream and
can be closed properly. If the freopen call is successful, myfile2 can
be used to close the stream properly.
fscanf
DS51456E-page 62
Description:
Include:
Scans formatted text from a stream.
<stdio.h>
? 2008 Microchip Technology Inc.
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相关PDF资料
SW006015
C COMPILER MPLAB C32
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
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