怎么读取一个txt文件？

[南风1]

读取一个txt文件的内容写到缓冲区，并求得缓冲区的大小，最好能给出实例，谢谢！

[bcpl]

CString sText;
CFile file("c:\\test.txt", CFile::modeRead);
DWORD dwLen = file.GetLength();
file.Read(sText.GetBuffer(dwLen), dwLen);
AfxMessageBox(sText);

[南风1]

不过我想用FILE*方法，用fread函数怎么取啊，如果是一个很大的txt文件，把它读出来写到另一个txt文件中？是不是要分段读取啊

[helloair]

Example

/* FEOF.C: This program uses feof to indicate when
* it reaches the end of the file FEOF.C. It also
* checks for errors with ferror.
*/

#include <stdio.h>
#include <stdlib.h>

void main( void )
{
int count, total = 0;
char buffer[100];
FILE *stream;

if( (stream = fopen( "feof.c", "r" )) == NULL )
exit( 1 );

/* Cycle until end of file reached: */
while( !feof( stream ) )
{
/* Attempt to read in 10 bytes: */
count = fread( buffer, sizeof( char ), 100, stream );
if( ferror( stream ) ) {
perror( "Read error" );
break;
}

/* Total up actual bytes read */
total += count;
}
printf( "Number of bytes read = %d\n", total );
fclose( stream );
}


Output

Number of bytes read = 745

[zhouyong0371]

FILE *fp;
if(!(fp=fopen("C:\\Roy.txt","rb")))
return;

if(fseek(fp,0l,SEEK_SET))
{
fclose(fp);
return;
}

DWORD fcount;
char buf[4096];
memset(buf, 0, 4096);
while((fcount=fread(buf,sizeof(char),4096,fp)))
{
//如果你要向另一个文件写入，只要在这里写入fcount长度就可以了
MessageBox(buf);
}
fclose(fp);