error LNK2019: unresolved external symbol

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Maialen
Maialen 2014-6-5
评论： José-Luis 2014-6-6
Hi everybody,
When I try to compile my S-function builder I get the following error:
Creating library myFunction.lib and object myFunction.exp myFunction_wrapper.obj : error LNK2019: unresolved external symbol ioctl referenced in function myFunction_Outputs_wrapper myFunction.mexw64 : fatal error LNK1120: 1 unresolved externals
This is the code that I use:
static char *i2cCtrlDevName = "/dev/i2ctrl"; static int i2cCtrlDev = -1; long ret;
i2cCtrlDev = open(i2cCtrlDevName, O_RDWR);
if (i2cCtrlDev < 0)
{
printf("Error opening '%s' device file\n", i2cCtrlDevName);
return -1;
}
ret = ioctl(i2cCtrlDev, I2CTRL_GET_INPUTS, 0);
if (ret < 0) return -1;
I realize that the problem is in ioctl function, which does not recognize. If anybody knows why this happens it will be very helpful.
Thanks in advance.
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Maialen
Maialen 2014-6-6
I still use this includes:
#include fcntl.h #include sys/ioctl.h #include sys/mman.h
Do I need some other file?
José-Luis
José-Luis 2014-6-6
I don't know. You could always look inside the library and see if the functions you need are listed there.
List symbols in a library

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