Declaring a string at run time with variables

Question

I am trying to create a string with parameters that I pass to a web service, but I never know how many parameters there are going to be until runtime.

All of the parameters are stored in an array, and I iterate through the array, adding each one the the string.

The variables on the .php side are labeled field1, field2, field3, etc.

My problem lies when I try to declare the string in the for loop. I am trying to use x and append that to the word "field" so that I can end up with field1, field2, filed3, etc.

When I try to do this, there is an error message saying that there were more parameters than expected.

Here's what I have:

NSString *URLWithParameters = [NSString stringWithFormat:@"http://www.mywebsite/service?"];

for (int x = 0; x < [fields count]; x++) {

    NSString *temp = [NSString stringWithString:@"field%i=%@&", x, (NSString *)[fields objectAtIndex:x]];

    URLWithParameters = [URLWithParameters stringByAppendingString:temp];

}

Joshua Weinberg · Accepted Answer · 2012-08-07 20:26:40Z

2

stringWithString should be stringWithFormat.

answered Aug 7, 2012 at 20:26

Joshua Weinberg

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Justin Boo · Accepted Answer · 2012-08-07 20:41:17Z

1

Change:

NSString *temp = [NSString stringWithString:@"field%i=%@&", x, (NSString *)[fields objectAtIndex:x]];

to:

NSString *temp = [NSString stringWithFormat:@"field%i=%@&", x, (NSString *)[fields objectAtIndex:x]];

Note:

Why You use [NSString stringWithFormat:@"http://www.mywebsite/service?"] when You can use it directly like this:

NSString *URLWithParameters = @"http://www.mywebsite/service?";

or using stringWithformat:

NSString *URLWithParameters = [NSString stringWithFormat:@"%@", @"http://www.mywebsite/service?"];

edited Aug 7, 2012 at 20:41

answered Aug 7, 2012 at 20:28

Justin Boo

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