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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