C / C++ / MFC

Cedric Moonen wrote:

If you want to append it, you'll have to increment the address (something like buff+Offset). But warning !! As your buffer is a ULONG, it means that a single increment will point to the next ULONG (so 4 bytes further). It is not a good idea in this case to use a pointer to ULONG, use a pointer to UCHAR instead so you don't have to cast the pointer to a char area in order to be able to increment only one byte.

<br />
#define BUFF_SIZE = 0X400;<br />
ULONG numBytesRead = 0, offset = 0;<br />
UCHAR *buff = null;<br />
buff = new UCHAR[45000000];<br />
while(...)<br />
{<br />
   ReadFile(hndlPciAlt, buff, BUFF_SIZE, numBytesRead, NULL); //DMA data xfer<br />
}<br />

<br />
#define BUFF_SIZE = 0X400;<br />
ULONG numBytesRead = 0, offset = 0;<br />
UCHAR *buff = null;<br />
buff = new UCHAR[45000000];<br />
while(...)<br />
{<br />
   ReadFile(hndlPciAlt, (buff + offset), BUFF_SIZE, numBytesRead, NULL); //DMA data xfer<br />
   offset += numBytesRead;<br />
}<br />

kitty5 wrote:

Is (buff + offset) the proper syntax to increment the address of buff?

Steen Krogsgaard wrote:

ReadFile will wait until it has read these bytes (assuming you don't use overlapped I/O, but that's another story),

Steen Krogsgaard wrote:

Will ReadFile return true if there is a timeout?

kitty5 wrote:

buff = new ULONG[11250000]; //total of 11,250,000 32-bit words

konstantinos_1000 wrote:

control does not have the properties that in sample program displayed