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POC struct sizes inconsistence
 

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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/143025/how-do-i-find-the-size-of-a-struct">How do I find the size of a struct?</a><br> <a href="https://stackoverflow.com/questions/6800884/struct-varies-in-memory-size">Struct varies in memory size?</a> </p> </blockquote> <p>I am using following struct for network communication, It creates lots of unnecessary bytes in between.</p> <p>It gives different size than expected 8 Bytes.</p> <pre><code>struct HttpPacket { unsigned char x1; union { struct { unsigned char len; unsigned short host; unsigned char content[4]; } packet; unsigned char bytes[7]; unsigned long num; } </code></pre> <p>And Following gives different size even though that I am removing a field from a union</p> <pre><code>struct HttpPacket { unsigned char x1; union { struct { unsigned char len; unsigned short host; unsigned char content[4]; } packet; unsigned long num; } </code></pre> <hr> <p>Also, A more clear example</p> <pre><code>struct { unsigned char len; unsigned short host; unsigned char content[4]; } packet; </code></pre> <p>And it gives a size of 8, instead of 7. And I add one more field, It still gives the same size</p> <pre><code>struct { unsigned char EXTRAADDEDFIELD; unsigned char len; unsigned short host; unsigned char content[4]; } packet; </code></pre> <hr> <p><strong>Can someone please help on resolving this issue ?</strong> </p> <p>UPDATE: I need the format to hold while transmitting the packet, So I want to skip these paddings</p>
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    1. COI need the format to hold while transmitting the packet, So I want to skip these paddings
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    2. CONeed this on XCode 4 LLVM Compiler
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    3. COBut, I need the solution for XCode 4 new LLVM Compiler.
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