这些语句是什么意思呀

[Ltaotao007]

ostrstream strbuf; //ostrstream是什么类型呀
struct stat for_len; //stat是什么结构体呀

if (stat (path,&for_len) == -1) return ;
unsigned int blen = for_len.st_size;
char *read_buffer = new char[blen];
In.read(read_buffer,blen);
string fill(read_buffer,blen); //这里是把文件大小定改fill吗



MessageBox("Your binary file could not be open",NULL,MB_OK);
return ;