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[winsock] read ahead socket + read stream size

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i'm working on some network code, and my server will make 3 send calls to send 3 blocks of data one after the other. The client check to see if the stream is readable, then assumes it has received all 3 blocks of data. As you can imagine, it may have only received the first block of data then i attempt to read in the other 2 blocks i get invalid data back. So my idea around the problem, is to see if i can read in the first block of data (leaving it in the stream so it can be read later) this first block of data has a size of the other 2 blocks of data in it, so then i can check to see if the read buffer is bigger than the 3 buffers so i know all data has been received. so im wondering how to do a read from the stream that doesnt remove the data, and also how to get the size of the read buffer. can i do this? what API methods should i look in to for these operations?

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You can use a MSG_PEEK flag when recv'ing. This will not actually take the data out of the socket's buffer.

On the other hand, if you put the size of the packet at the beginning of each packet, then you could read everything in the buffer and then process each complete message. The size of the buffer is what is returned from recv()

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yeah i had a look in to it, apparently its bad to peek in to the buffer, so i've just made a buffer for my socket connections which i can do what i want with :)

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We've discussed this question to great extent in the networking & multiplayer forum. Take a look at the last week's threads there. Also, the FAQ for that forum has an outline of the solution.

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