Hi, All,
I am trying to read a configuration file using Viper, the config file is a
very simple json file with one line
{
"device" : "eth1"
}
I use the following line to read it
device := viper.GetString("device")
then passing this var further into a C library with swig generated api as
arg2
itc := device //Need to update if there is more devices
libpi.PI_init_global_config(1, &itc)
func PI_init_global_config(arg1 int, arg2 *string) {
I can retrieve the correct value, and can verify that var device does have
eth1 as the value when printf it. I even did the compare of device ==
"eth1", and the result is true.
However, when passing this device var to the PI_init_gloable_config API, I
got code crashed with the following error
*panic: runtime error: cgo argument has Go pointer to Go pointer*
If instead of reading this file from configuration json, I hardcode it in
the code as
device := "eth1"
then there is no issue at all. If I read this variable using Flag from
command line, like
flag.StringVar(&device, "Device", "eth1", "NIC to Listen")
there was no problem either.
Can anybody please enlighten me what's the difference? Why this error is
triggered? I googled quite a bit, but it does not seem to help. I have go
1.8.3 installed.
Thanks,
Chun
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