This post shares the code to do a simple HTTP POST from iOS.

NSString *post = [NSString stringWithFormat:@"key1=%@&key2=%@",value1,value2];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];

NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
NSString *urlString = @"http://someurl";
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:postData];
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];


I ran across a strange problem today. Tried something like this:

switch(controlVariable) {

case 0:

NSInteger x = kSomeConstant;

// some other code…

break;

case 1:

// …

default:

// …

}

And to my surprise, XCode complained saying that “Parse error: Expected Expression”. Upon googling, this is what I found.

So, the solution is to put some statement before you initialize NSInteger. If there is no statement that logically fit, you can simply insert a semi-colon “;” before declaring and initializing the integer.

switch(controlVariable) {

case 0:

;

NSInteger x = kSomeConstant;

// some other code…

break;

case 1:

// …

default:

// …

}

If you see this problem, try following these steps.

a) quit Xcode (and the GDB it is running)
b) unplug device
c) delete app from device (hold icon until the ‘X’ appears)
d) turn off device
e) turn on device
f) plug in device (if itunes wants to sync, let it finish)
g) launch Xcode