Norbert Heller wrote in a message to all:

 NH> can anybody tell me how to read a sector from cd rom ? 
 NH> i tried the following code, but i guess i didn't quite
 NH> understand the dosdevioctl control (it actually hangs the
 NH> system )


 NH> typedef struct
 NH> {
 NH>   UCHAR    ucSignature[4];
 NH>   UCHAR    ucAdrMode;
 NH>   USHORT   usNumberOfSectors;
 NH>   UCHAR    ucStartingSector;
 NH>   UCHAR    ucReserved;
 NH>   UCHAR    ucInterLeaveSize;
 NH> }
 NH> CD_PARAMETER_PACKET;

 NH> typedef struct
 NH> {
 NH>   UCHAR         ucSync[12];
 NH>   UCHAR         ucHeader[4];
 NH>   UCHAR         ucData[2048];
 NH>   UCHAR         ucEDC_ECC[288];
 NH> }
 NH> CD_DATA_PACKET;

This may seem like an awfully insulting question, but did you remember to
explicitly override your compiler's structure packing conventions?  You
must pack all structures on byte boundaries for the device drivers, but
32-bit compilers pack by default on doubleword boundaries.  Most compilers
allow "#pragma pack(1)" to achieve this, or require a command
line option.
 
-- Mike


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