Deep C Language The solution of reading a file into a string and writing a string to a file _c language

1. Pure C Implementation

Copy Code code as follows:

FILE *FP;
if (fp = fopen ("Example.txt", "rb") = = NULL)
{
Exit (0);
}
Fseek (FP, 0, Seek_end);
int fileLen = Ftell (FP);
Char *tmp = (char *) malloc (sizeof (char) * fileLen);
Fseek (FP, 0, Seek_set);
Fread (TMP, FileLen, sizeof (char), FP);
Fclose (FP);
for (int i = 0; i < FileLen; ++i)
{
printf ("%d", tmp[i]);
}
printf ("\ n");

if (fp = fopen ("Example.txt", "wb") = = NULL)
{
Exit (0);
}
Rewind (FP);
Fwrite (TMP, FileLen, sizeof (char), FP);
Fclose (FP);
Free (TMP);

2. Using CFile (MFC base Class)

CFile need to include header files for Afx.h

The function prototype for opening the file is as follows

if (!) ( Fp. Open ((LPCTSTR) m_strsendfilepathname,cfile::moderead))

There are a variety of patterns, commonly used are as follows:

Moderead

Modewrite

Modereadwrite

Modecreate

There are two kinds of file types:

Typebinary

TypeText

Read and write non-text files must use Typebinary

function prototypes for reading data:

Virtual Uintread (void*lpbuf, UINT ncount);

Read the file:

Copy Code code as follows:

CFile FP;
if (!) ( Fp. Open ((LPCTSTR) m_strsendfilepathname,cfile::moderead))
{
Return
}
Fp. Seektoend ();
Unsignedint fplength = fp. GetLength ();
Char *tmp= new Char[fplength];
Fp.    Seektobegin (); This sentence is essential
if (FP. Read (Tmp,fplength) < 1)
{
Fp. Close ();
Return
}

New file and write to

Copy Code code as follows:

if (!) ( Fp. Open ((LPCTSTR) M_strsendfilepathname,
Cfile::modecreate | Cfile::modewrite | cfile::typebinary)))
{
Return
}
Fp. Seektobegin ();
Fp.write (tmp,fplength);
Fp.close;