Hello Sinisa and everybody else,
sorry that I contact you directly! But I tried all suggestions and it
still doesn't work! The UDF return string has always 256 characters!
I've used my_malloc and my_free! Also I allocated the necessary memory
in xxx_init()! But it doesn't work! What can I do? Who is the mysql
developer who is specialized in UDF programming! It's very important! To
change the initid->max_length has no effect. If I set this value on 12
or so, I will furthermore get 256 characters, why? Is it a bug?
Thank you for your help and support!
Greetings Tom
Some code:
// init function
my_bool IHistogram_init(UDF_INIT *initid, UDF_ARGS *args, char
*message){
// Parameter: ID, filepointer, data
if (args->arg_count != 3)
{
strcpy(message,"Usage: ID, filepointer and data field.");
return 1;
}
initid->ptr = (char*) my_malloc (65535 * sizeof(char), MY_ZEROFILL);
// Set types
args->arg_type[0] = STRING_RESULT;
args->arg_type[1] = STRING_RESULT;
args->arg_type[2] = STRING_RESULT;
return 0;
}
void IHistogram_deinit(UDF_INIT *initid)
{
my_free(initid->ptr, MY_ZEROFILL);
}
char* IHistogram(UDF_INIT *initid, UDF_ARGS *args, char *result,
unsigned long length, char *is_null, char *error){
char* res;
// Calc histogram, result: histogram-string
res = checkIHist(args->args[0], args->args[1], args->args[2],
args->lengths[1], args->lengths[2]);
// Error occured
if (strcmp(res, "ERROR") == 0){
*error = 1;
return 0;
}
else{
initid->ptr = res;
return initid->ptr;
}
}
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