Not Able to read write full data into a file using fprintf in VS2005

class CTIUSMO_RWDlg : public CDialog
{
// Construction
public:
    CTIUSMO_RWDlg(CWnd* pParent = NULL);    // standard constructor

    FILE * pFile;

}

//    In Dlg.cpp

LPCTSTR ReadValue;

/* I'm not adding whole code here......Actually ReadValue is a pointer for shared memory , and It's getting data */   


ReadValue = (LPTSTR) MapViewOfFile(hMapFile2, // handle to map object
		FILE_MAP_ALL_ACCESS,  // read/write permission
		0,
		0,
		BUF_SIZE);

/* Here in array a[i} , Im getting all the values..., But when I do the fprint I'ts printing only first digit( say for ex.25565 means , it's printing only 2) */

    CString a[100];

    for ( int i=0;i<100;i++)
    {

         a[i] =  ReadValue;
         ReadValue=ReadValue+4;
         fprintf(pFile,"%s\n",a[i]);
    }

    fclose(pFile);