hi!! i encountered a poblem when using ReadPipeAsync
to read the continuous live streaming data from my
camera. whenever it goes to the ReadPipeAsync part, a
message will pop up asking me to restart my computer
by pressing the power button. why is this so? am i
using the correct method to read the streamming data?
can i use a loop to do this if i want to capture data
for 10 seconds???
pls help me out!! thks!
my code*************
void fASync(IOUSBInterfaceInterface **interface)
{
IOReturn theResult;
CFRunLoopSourceRef runLoopSource;
kern_return_t kernResult;
UInt32 numBytesRead = 512;
if ((picFile = fopen("pic.mov","wb+"))==NULL)
{
printf("File could not be opened \n");
}
kernResult =
(*interface)->CreateInterfaceAsyncEventSource(interface,
&runLoopSource);
if (kIOReturnSuccess != kernResult)
{
printf("unable to create async event source
(%08x)\n", kernResult);
(void)
(*interface)->USBInterfaceClose(interface);
(void) (*interface)->Release(interface);
}
CFRunLoopAddSource(CFRunLoopGetCurrent(),
runLoopSource, kCFRunLoopDefaultMode);
int wTime = time(NULL)+10;
while(time(NULL)<=wTime)
theResult = (*interface)->ReadPipeAsync( interface,
2, fReceiveBuffer,numBytesRead, readCallback, (void
*)interface );
if (kIOReturnSuccess != theResult)
{
printf( "Could not accomplish a bulk read
(%08x)\n", theResult );
(void)
(*interface)->USBInterfaceClose(interface);
(void) (*interface)->Release(interface);
return;
}
}
void readCallback(void *refcon, IOReturn result, void
*arg0)
{
IOUSBInterfaceInterface **interface =
(IOUSBInterfaceInterface **)refcon;
UInt32 numBytesRead = (UInt32) arg0;
int line=0;
int bb = 0;
for(bb =0; bb < numBytesRead;bb++) // loop to print
data in buffer
{
printf("%0x ", fReceiveBuffer[bb]);
fwrite(&fReceiveBuffer[bb],sizeof(UInt8),1,picFile);
if((bb+1)%16 == 0)
{
printf("\n");
line++;
if(line%256 == 0)
printf("\n%d\n", line);
}
}
}
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