fread 到底怎么用，帮我看看这段代码！

Question

下面这段代码，每次执行到fread的时候就出错，错在那里？
FILE *fp;
long size = 0;
    char read;
    CString str; if (fopen("c:\\text.txt","rb")!=NULL)
{
    while(fread(&read,sizeof(read),1,fp)) 
{   str+=read;
size++;
}
}

Answer 1

FILE *stream;
   char list[30];
if( (stream = fopen( "fread.out", "r+t" )) != NULL )
   {
      /* Attempt to read in 25 characters */
      numread = fread( list, sizeof( char ), 25, stream );
      printf( "Number of items read = %d\n", numread );
      printf( "Contents of buffer = %.25s\n", list );
      fclose( stream );
   }
   else
      printf( "File could not be opened\n" );

Answer 2

if (fp=fopen("c:\\text.txt","rb")!=NULL)

Answer 3

It's really a basic question :) take care all the variables u defined,and where they r used

Answer 4

FILE *fp;
long size = 0;
    char read;
    CString str;
    fp=fopen("c:\\text.txt","rb");
if (fp!=NULL)
{
    while(fread(&read,sizeof(read),1,fp)) 
{   str+=read;
size++;
}
}

Answer 5

CFile _fileopen;
CFileException ex;
    long size = 0;
    char read;
    CString str; if (!_fileopen.Open("c:\\text.txt",
                             CFile::modeRead |
                             CFile::typebinary,
                             &ex))
         { char error[1024];
           ex.GetErrorMessage(szError, 1024); 
          }
          else
{
    while(_filelopen.Read(&read,sizeof(read)) 
{   str+=read;
size++;
}
}