如何使用std :: fprintf（）打印长字符串？

Question

I have a string of size 1024 and I would like to print it using std::fprintf(). I tried the following:

FILE* m_file = .....;
char * msg = .....; // (size of 1024)
std::fprintf(m_file, "'%.1024s'\n", msg);

But in the output file, I see the msg printed only up to the length of 1000.

Could not find anything in documentation about it, does anyone have a clue?

Update:

It turns out that somewhere during our pipeline, the string is being cut at size 1000, and that's I did not see the whole string after fprintf

Answer 1

"I see the msg printed only up to the length of 1000." --> "%.1024s" prints up to the the length of the string or 1024, whichever is smaller.

Apparently m_file[1000] is '\\0' .

Answer 2

You should use an ofstream instead. Presuming that you have initialized your ofstream m_file successfully you can do:

m_file.write(msg, 1024)