Ian:
Thanks.
In the real environment, t transform the error message into a JSON document
and C.free as soon as the transformation is done. The end user will see
the proverbial error interface.
With regards,
mp
On Friday, December 8, 2017 at 10:24:45 AM UTC-7, M.P. Ardhanareeswaran
wrote:
>
> All:
>
> I am able to pass a []*C.SQL_ERROR_TYPE to C, allocate memory for
> SQL_ERROR_TYPE on the "C" side, populate the structure and access it on the
> Go side. It works. I tested Mac (High Sierra) and Linux 7, 64 bit. Is
> this legitimate? Or is it just happenstance that it is working?
>
> With regards,
>
> package ttodbc
>
> import "unsafe"
> import "fmt"
>
> /*
> #include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
>
> typedef struct sqlError {
> int recordNumber;
> char sqlState[32];
> int nativeError;
> char messageText[1024];
> } SQL_ERROR_TYPE;
>
> void *CSlice(void* slice) {
> int pos=0;
> SQL_ERROR_TYPE **tmp = (SQL_ERROR_TYPE **) slice;
> void *dummy;
> for (pos =0; pos < 16; pos++) {
> printf("Populating %d\n", pos);
> tmp[pos] = malloc(sizeof(SQL_ERROR_TYPE));
> tmp[pos]->nativeError = pos+100;
> tmp[pos]->recordNumber = pos;
> strcpy(tmp[pos]->sqlState, "S1000");
> }
> dummy = malloc(sizeof(int) );
> return dummy;
> }
> */
> import "C"
>
> func SliceToC() {
> slice := make([]*C.SQL_ERROR_TYPE, 16)
> ret := C.CSlice(unsafe.Pointer(&slice[0]))
> fmt.Println("Ret %v", ret)
> for i := 0; i < 16; i++ {
> var tmp *C.SQL_ERROR_TYPE = slice[i]
> fmt.Println("SQLState, native error: ", C.GoString(&tmp.sqlState[0]),
> uint(tmp.nativeError))
> }
> }
>
>
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