這些函式是 、 _vsnprintf、、 _vsnwprintf_vsnprintf_l的版本vsnprintf,_vsnwprintf_l具有CRT 中安全性功能中所述的安全性增強功能。 語法 C 複製 int vsnprintf_s( char *buffer, size_t sizeOfBuffer, size_t count, const char *format, va_list argptr ...
not including the terminating null, or a negative value if an output error occurs. vsnprintf_s is identical to _vsnprintf_s. vsnprintf_s is included for compliance to the ANSI standard. _vnsprintf is retained for backward compatibility. ...
} 实测,当格式化字符串的长度大于等于1024时,会崩溃。 改成:vsnprintf_s(logbuff,sizeof(logbuff)-1, format, ap)即可,会自动截断。
va_start(ArgList, pFormat);charBuffer[1024] = {0};intRet =_vsnprintf_s(Buffer,1024, _TRUNCATE, pFormat, ArgList);// Format 后字符串最大长度为 1023//int Ret = _vsnprintf(Buffer, 1024, /*_TRUNCATE,*/ pFormat, ArgList);if(Ret <0) Buffer[1023] ='\0'; va_end(ArgList); putLog...
_vsnprintf_s 是一种 C 语言函数，用于将格式化字符串写入指定大小的缓冲区。它是 _vsprintf_s 的...
(args, formatstring); nSize = vsnprintf_s( buff, _countof(buff), _TRUNCATE, formatstring, args);printf("nSize: %d, buff: %s\n", nSize, buff); va_end(args); }intmain(){ FormatOutput("%s %s","Hi","there"); FormatOutput("%s %s","Hi","there!"); ...
sprintf_s(data.buf, len,"%d",1234); Debug模式下执行,会触发assert,如下图: 总结:sprintf_s函数只能在Windows下使用,虽然不会出现写坏内存的情况,但是会触发assert,导致程序中断,使用起来也要慎重。 vsprintf_s的行为与sprintf_s一样。 三、_snprintf(Windows only) ...
vsnprintf_s,_vsnprintf_s and _vsnwprintf_s return the number of characters written, not including the terminating null, or a negative value if an output error occurs. vsnprintf_s is identical to _vsnprintf_s. vsnprintf_s is included for compliance to the ANSI standard. _vnsprintf is reta...
(args, formatstring); nSize = vsnprintf_s( buff, _countof(buff), _TRUNCATE, formatstring, args);printf("nSize: %d, buff: %s\n", nSize, buff); va_end(args); }intmain(){ FormatOutput("%s %s","Hi","there"); FormatOutput("%s %s","Hi","there!"); FormatOutput("%s %s","Hi...
编写格式化输出使用指针参数列表。这些是vsnprintf, _vsnprintf, _vsnprintf_l, _vsnwprintf, _vsnwprintf_l的版本与安全增强的CRT中的安全功能如中所述。 复制 int vsnprintf_s( char *buffer, size_t sizeOfBuffer, size_t count, const char *format, va_list argptr ); int _vsnprintf_s( char *...