C/c++中有哪个函数可以写出超过2GB的大文件
如题
[解决办法]
fopen, fsetpos, fwrite
编译时指定大文件支持即可。
The following example shows how an application using threads interfaces can test for support of and use a programming environment supporting 32-bit int, long, and pointer types and an off_t type using at least 64 bits:
if [ $(getconf _POSIX_V6_ILP32_OFFBIG) != "-1" ]
then
c99 $(getconf POSIX_V6_ILP32_OFFBIG_CFLAGS) -D_XOPEN_SOURCE=600 \
$(getconf POSIX_V6_ILP32_OFFBIG_LDFLAGS) foo.c -o foo \
$(getconf POSIX_V6_ILP32_OFFBIG_LIBS) -l pthread
else
echo ILP32_OFFBIG programming environment not supported
exit 1
fi
[解决办法]
流(含内存流)均支持超过4G文件：size是__int64类型的。
不支持超过2G的原因是因为文件系统本身是32位的，当指针超出2G时，操作系统地址快表实际已发生回滚溢出了(负地址)。因此，要想超过2G的大文件，你首先得讲操作系统改成支持大文件系统的，或干脆升到64位。
