How to convert int to big-endian 32-bit number in Objective C?

I'm trying to implement WebSocket handshake (76) in ObjC and can't figure out (as I'm new to C and ObjC) how can I get the following:

1. List item

2. I've got two number

   155712099
   173347027开发者_如何学运维
   

3. I need to convert them to 32 bit big-endian numbers

4. concatenate them into a string
5. and express the resulting string in ASCII

Help is highly appreciated.

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Since you're using the iPhone SDK, you have access to Core Foundation. Use:

uint32_t myInt32Value = ...;
uint32_t myInt32AsABigEndianNumber = CFSwapInt32HostToBig(myInt32Value);

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Objective-C is based on C and usually has the C standard library available, so you can use the standard htonl function. You can then do the string manipulation using the normal string functions.