add：添加获取一个文件名的当前时间后缀的新名字函数。

include/of_str.h

@@ -15,6 +15,10 @@ public:
     static ofString replace(const ofString& str, const ofString& from, const ofString& to);
     static std::vector<ofString> split(const ofString& input, const ofString& delimiter);
     static ofString trim(const ofString& input);
+    /// @brief 获取一个添加当前日期后缀的字符串（到秒，如 some.txt => some_20150115151221.txt）。
+    /// @param name 
+    /// @return 
+    static ofString get_ofile_name(const ofString& name);
 };
 };   // namespace ofen
 

src/of_str.cpp

@@ -1,4 +1,9 @@
 #include "of_str.h"
+#include <chrono>
+#include <ctime>
+#include <iomanip>
+#include <sstream>
+#include <string>
 
 namespace ofen {
 COfStr::COfStr()
@@ -40,4 +45,27 @@ ofString COfStr::trim(const ofString& input)
     size_t end = input.find_last_not_of(ofT(" \t\n\r\f\v"));
     return input.substr(start, end - start + 1);
 }
+ofString COfStr::get_ofile_name(const ofString& name)
+{
+    auto now = std::chrono::system_clock::now();
+    std::time_t now_c = std::chrono::system_clock::to_time_t(now);
+    std::tm local_tm = *std::localtime(&now_c);
+
+    std::ostringstream oss;
+    oss << std::put_time(&local_tm, "%Y%m%d%H%M%S");
+    ofString timestamp;
+#ifdef UNICODE_OFSTR
+    std::string temp = oss.str();
+    timestamp.assign(temp.begin(), temp.end());
+#else
+    timestamp = oss.str();
+#endif
+    size_t dot_pos = name.find_last_of(ofT('.'));
+    if (dot_pos == ofString::npos) {
+        return name + ofT("_") + timestamp;
+    }
+    ofString base_name = name.substr(0, dot_pos);
+    ofString extension = name.substr(dot_pos);
+    return base_name + ofT("_") + timestamp + extension;
+}
 }   // namespace ofen