修复在vc2013环境下编译问题.

Signed-off-by: jack <jack.wgm@gmail.com>
修复多种子文件时, 忘记计算文件偏移的问题.

Signed-off-by: jack <jack.wgm@gmail.com>
更新vc项目文件.

Signed-off-by: jack <jack.wgm@gmail.com>