int CGpio::GPIOReadFd(int fd)
{
int bytecount = -1;
char value_str[GPIO_MAX_VALUE_SIZE];
if (fd == -1)
return -1;
if (lseek(fd, 0, SEEK_SET) == -1)
return -1;
bytecount = read(fd, value_str, GPIO_MAX_VALUE_SIZE);
return(GetReadResult(bytecount, &value_str[0]));
}
unsigned MFMediaIOEx::Read(void* pb,unsigned size)
{
if (!CreateEvents())
return 0;
_dwReadOKSize = 0;
_blockState = true;
HRESULT hr = _pStream->BeginRead((BYTE*)pb,size,this,nullptr);
if (FAILED(hr))
{
_blockState = false;
return 0;
}
auto result = GetReadResult();
_blockState = false;
if (result != ReadOK || _dwReadOKSize == 0)
return 0;
return _dwReadOKSize;
}
int CGpio::GPIORead(int gpio_pin, const char *param)
{
char path[GPIO_MAX_PATH];
char value_str[GPIO_MAX_VALUE_SIZE];
int fd;
int bytecount = -1;
snprintf(path, GPIO_MAX_PATH, "%s%d/%s", GPIO_PATH, gpio_pin, param);
fd = open(path, O_RDONLY);
if (fd == -1)
return -1;
bytecount = read(fd, value_str, GPIO_MAX_VALUE_SIZE);
close(fd);
if (-1 == bytecount)
{
close(fd);
return -1;
}
return(GetReadResult(bytecount, &value_str[0]));
}
