| Problems with IDL strings [message #36584] |
Wed, 08 October 2003 03:39 |
jicicuendez
Messages: 12
Registered: November 2001
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Junior Member |
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I am in trouble when trying to connect idl with C. I have a c function
that produces certain strings and I want to copy them back into an idl
array of strings. The c functions produces eleven 28-character long
strings and when I use call_external I provide and idl string
11-element array with 28 character long each. What happens is there
must be something strange with the memory I provide to the function
because after calling the function I get the same string copied
everywhere in the IDL array. Testing the contents within the c
function the same thing happens.
I provide my commented code to see if anyone has a clue or bumped into
this problem before. I wish that RSI would give more info about this
things. Documentation is pretty bad!!
Many thanks,
Juan
long convert_to_time_ticks(int argc, void *argv[])
{
long status, cfi_utc[4];
double *decimal_time, decimal[2];
long n_data;
char dut1e[9];
char utc_string[28];
int i;
IDL_STRING *myString;
decimal_time = (double *)argv[0];
n_data = *((long *)argv[1]);
myString = (IDL_STRING *)argv[2];
for(i=0; i<n_data; i++){
decimal[0]=decimal_time[i];
decimal[1]=0.0;
// function to transform time in decimal days to UTC string
status=ml_pmjd(cfi_utc, decimal, utc_string, dut1e);
// copying each string to an array of IDL_string
structure
strcpy(myString[i].s, utc_string); //Seems OK
// Checking copied contents and addresses
printf("in structure: %s\n",myString[i].s); //Seems OK
// The memory addresses change-->Seem to be ok
printf("memory address%d \n", &(myString[i].s));
}
// Doing the loop again in once
for(i=0; i<n_data; i++){
// Here is the problem, when I print out the contents
of
// the structure again all the values are the same and
// equal to the last UTC time read from the function
printf("in estructure: %s\n",myString[i].s);
printf("direccion %d \n", &(myString[i].s));
}
return status;
}
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