How do I convert an image into a buffer so that I can send it over using socket programming? C++

Question

1. How do I convert an image into a buffer so that I can send it over using socket programming? I'm using C++ socket programming. I am also using QT for my Gui.

2. Also, after sending it over through the socket, how do I put that image back together so it can become a file again?

If someone could put up some sample code that would be great :)

I was looking around and found something about rfile but still not going through my head.

tyty

Answer 1

如果您使用的是Qt，请使用QImageWriter和QImageReader并让它们直接处理套接字，从而避免需要临时文件。

Answer 2

Assuming that you want to send an image as a file,
here is pseudocode to send it through a TCP connection.

Client A

Set up a connection  
Open a file in binary mode  
Loop:  
   read/load N bytes in a buffer  
   send(buffer)  
Close file  
Close connection  

Client B

Listen and accept a connection  
Create a new file in binary mode  
Loop:  
   n = read(buffer)   
   write n bytes in the file
Close file  
Close connection  

Answer 3

I figured this out as well and wrote down what I did. You can find the description here: http://hanckmann.net/?q=node/44 . It is fine to download and use the examples there!