How do I get char * from vector?

Question

I have declared a vector like this

vector<char> vbuffer;

and used it as a receive buffer like this..

recv = read(m_fd, &m_vbuffer[totalRecv], SIZE_OF_BUFFER);

It seems like working and now I want to get the raw char data for parsing..

If I have defined a function like this..

char* getData(){
//return char data from the vector

}

How would I fill inside of the function? Thanks in advance..

What do you think `&m_vbuffer[totalRecv]` is doing? Have you resized the vector first? — John Zwinck, Jun 22 '11 at 03:11
That third argument needs to be `m_vbuffer.size() - totalRecv`. If you don't subtract the current offset, you can overrun the buffer. — Ben Voigt, Jun 22 '11 at 03:17

score 4 · Answer 1 · edited Jun 22 '11 at 12:21

4

in c++0x, simply do m_vbuffer.data()

edited Jun 22 '11 at 12:21

Brad Mace

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answered Jun 22 '11 at 05:25

Deyili

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score 3 · Accepted Answer · answered Jun 22 '11 at 03:09

3

As long as you don't resize the vector in any way, you can use &vbuffer[0] as a pointer to the array. There are many operations that will invalidate pointers to a vector though, make sure you don't call any of them while you have a pointer in use.

answered Jun 22 '11 at 03:09

Mark Ransom

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score 1 · Answer 3 · answered Jun 22 '11 at 03:09

1

This will give you a pointer to the first element in the vector, so you can use it like an array:

&m_vbuffer[0]

answered Jun 22 '11 at 03:09

John Zwinck

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How do I get char * from vector?

3 Answers3