How do I copy a Go string to a C char * via CGO in golang?
12,719
Solution 1
According to the cgo documentation you need to use the C.CString function to convert a Go string to a C string:
cstr = C.CString(str)
Be aware that C.CString function allocates the memory for you, but won't release it, so it is your responsability to freed the memory with a call like:
C.free(unsafe.Pointer(cstr))
Solution 2
using
cstr = C.CString(str)
did not work for me, so I opted for something I saw directy on CGO library: C.strcpy((*C.char)(cstr), (*C.char)(C.CString(str)))
Author by
steve landiss
Updated on June 06, 2022Comments
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steve landiss about 2 years
I want to copy a Go string into a char * via CGO.
Am I allowed to do this something like this?
func copy_string(cstr *C.char) { str := "foo" C.GoString(cstr) = str }
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Bear0x3f over 6 yearsbetter with
defer C.free(unsafe.Pointer(cstr))
go will call when function returns -
kbolino over 2 yearsWhat about it didn't work?