ASIHTTPRequest Multiple POST parameters

I'm using ASIFormDataRequest to post data to a server, and I need to post an array of values (strings in the example below). I'm using an enumerator to loop through each and add them to the request, bu开发者_开发技巧t only the last one comes through - the behaviour you'd expect for setPostValue, not addPostValue.

Any idea why only one value is coming through?

NSEnumerator *pupilEnumerator = [pupils objectEnumerator];
id pupil;
while ((pupil = [pupilEnumerator nextObject])) {
  [request addPostValue:pupil forKey:@"pupils"];
}

Note this also occurs for addFile and addPostData.

Cheers.

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Your loop just keeps replacing the "pupils" value. Get rid of the loop and try [request addPostValue:pupils forKey:@"pupils"];

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If I were you I'd bundle up your pupils object into a JSON string (I'd use JSON Framework, but there are other options), and put that in the post body.

Or, if you're posting to a PHP script, you CAN post multiple values straight into an array, by putting "[]" after the key name. So, still inside your loop, you could say [request addPostValue:pupil forKey:@"pupils[]"];, and then your posted-to script will have an array called $pupils that will contain all those values.

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I faced a similar problem where I had multiple parameters and one of them (only one of the parameters) was supposed to be an array. The easier way I found was to add the values for that array to an NSMutableArray and then transfer those values to the parameter:

//Don't forget to set this array to retain its values in the property
self.arrSelected = [[NSMutableArray alloc]initWithArray:nil];

if(switch1.selected){
    [self.arrServicesSelected addObject:@"value1"];
}
if(switch2.selected){
    [self.arrServicesSelected addObject:@"value2"];
}
if(switch3.selected){
    [self.arrServicesSelected addObject:@"value3"];
}

Then you just need to go through the array and add the values to the POST parameter. Make sure you add them to different indices. I have seen some people adding to the [] without the index and that will not work as it will add only the last one. If you don't use the [] you will only add the first one.

for(int i=0; i< [self.arrSelected count];i++){
    [requestPOST setPostValue:[self.arrSelected objectAtIndex:i]  forKey:[NSString stringWithFormat:@"chk_parameter_serv[%i]", i]];
}

You can also use the forin syntax:

int i=0;
for(NSString *strValue in self.arrSelected)
    [requestPOST setPostValue:strValue  forKey:[NSString stringWithFormat:@"chk_parameter_serv[%i]", i++]];