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Directly from the cplusplus documentation snprintf composes a string with the same text that would be printed if format was used on printf, but instead of being printed, the content is stored. Well, this all depends on what kind of security the op's question is about. This pointer will be the first argument that you pass to snprintf.

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Or do you have to do like.

The compiler is warning you about exactly what you think it is warning you about:

Snprintf () nicely prevents overrunning the destination s. In other words, is this sufficient: Is snprintf always null terminating the destination buffer? The function snprintf will silently truncate the string if it is too large, whereas the function sprintf_s will call the currently installed contraint handler function.

The string emitted by the snprintf() call may be truncated relative to the one that would be. What you are talking about in this. I have to format std::string with sprintf and send it into file stream. If you must use snprintf, you will need to create a separate pointer to keep track of the end of the string.