I have a incoming packet of 75 bytes. It is packed of five 10 Bitters and five 5 Bitters. like 10-5-10-5-... What is the best way to receive-parse-modify and send the packet back using struct/union or any ther way. :o
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I have a incoming packet of 75 bytes. It is packed of five 10 Bitters and five 5 Bitters. like 10-5-10-5-... What is the best way to receive-parse-modify and send the packet back using struct/union or any ther way. :o
Use bit fields: http://msdn.microsoft.com/en-us/libr...=vs.71%29.aspx
What is a "10 Bitter"? 10-bit value? Packed into what?Quote:
Originally Posted by lch2
Trying to figure out your math. If you have five 10-bit values and five 5-bit - this only makes 75 BITS, not bytes. What am I doing wrong?
Pretty sure you will also need the extern "C" for this, because C++ will pad however it wishes.
No, he won't need to extern it. C++ will not pad it if he builds his struct properly.
Always try to allign your packed structs on word boundries, at the very least.Code:struct SomeBits
{
unsigned short first_10_bits : 10;
unsigned char next_5_bits : 5;
unsigned short next_10_bits : 10;
unsigned char next_5_bits : 5;
unsigned short next_10_bits : 10;
unsigned char next_5_bits : 5;
unsigned short next_10_bits : 10;
unsigned char next_5_bits : 5;
unsigned short next_10_bits : 10;
unsigned char next_5_bits : 5;
unsigned char pad :5;