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f.open(FileName, ios::in|ios::app );
if(f.is_open()){
f.seekg(0, ios::beg);
char *s = "hello";
f.write(s, strlen(s));
char s1[512];
f.read(s1, 0);
}
main()
{
fstream f;
........
GetCurrentDirectory(MAX_FILE_PATH_LEN, FileDir);
sprintf_s(FileName, MAX_FILE_PATH_LEN, "%s\a.txt",
FileDir, );
f.open(FileName, ios::in|ios::app );
if(f.is_open()){
f.seekg(0, ios::beg);
char *s = "hello";
f.write(s, strlen(s));
char s1[512];
f.read(s1, 0);
}