c++ boost : 保留最新文件其余删除
#include <boost/filesystem.hpp>
#include <iostream>
#include <stdio.h>
/*
* delete_file_and_dir - 删除指定路径下文件和目录，保留指定个数的新文件
* @path : 路径
* @reserved_quantity : 保留新文件个数
*/
int delete_file_and_dir(const std::string &path, int reserved_quantity) {
std::string cmd;
std::vector<boost::filesystem::path> __file;
int res;
int count = 0;
if (!boost::filesystem::is_directory(path)) {
printf("path %s error\n", path.c_str());
return -1;
}
for (auto file : boost::filesystem::directory_iterator(path)) {
__file.push_back(file.path());
}
printf("folder %s have files [%ld], delete to [%d]\n",
path.c_str(), __file.size(), reserved_quantity);
count = __file.size();
while (count-- > 0) { /* avoid a dead loop */
__file.clear();
for (auto file : boost::filesystem::directory_iterator(path)) {
__file.push_back(file.path());
}
if (static_cast<int>(__file.size()) <= reserved_quantity) {
break;
}
/* 按照修改时间排序，新文件在前 */
sort(__file.begin(), __file.end(),
[](const boost::filesystem::path &a, const boost::filesystem::path &b)->bool {
std::time_t t1 = boost::filesystem::last_write_time(a);
std::time_t t2 = boost::filesystem::last_write_time(b);
return t1 > t2;
});
auto it = --__file.end();
/* delete directory */
if (boost::filesystem::is_directory(*it)) {
cmd = "rm -rf " + it->string();
printf("cmd:%s\n", cmd.c_str());
system(cmd.c_str());
}
/* delete file */
else {
if (res = remove(it->string().c_str()), 0 == res) {
printf("delet file {%s}\n", it->string().c_str());
__file.erase(it);
} else {
printf("delete file {%s} failed\n", it->string().c_str());
return -1;
}
}
}
return 0;
}
int main(void)
{
std::string path = "/home/ac-test";
/* 保留最新3个文件 */
delete_file_and_dir(path, 3);
return 0;
}
#if 0
g++ -Wall -o boost-clear-dir boost-clear-dir.o -lboost_filesystem
#endif