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    <p>Here is a basic example using PUT. Obviously you should be using a queue rather than a synchronous request in the real world.</p> <p>If you change the amz headers, don't forget to update 'canonicalizedAmzHeaders' as per Amazon's instructions.</p> <pre><code>#import "ASIHTTPRequest.h" #import &lt;CommonCrypto/CommonHMAC.h&gt; ... - (void)testS3 { NSString *filePath = @"/path/to/file"; NSString *contentType = @"text/plain"; NSString *bucket = @"mybucket"; NSString *path = @"test"; NSString *secretAccessKey = @"my-secret-access-key"; NSString *accessKey = @"my-access-key"; NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease]; [dateFormatter setDateFormat:@"EEE, d MMM yyyy HH:mm:ss zzzz"]; NSString *date = [dateFormatter stringFromDate:[NSDate date]]; ASIHTTPRequest *request = [[[ASIHTTPRequest alloc] initWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://%@.s3.amazonaws.com/%@",bucket,path]]] autorelease]; [request setPostBodyFilePath:filePath]; [request setShouldStreamPostDataFromDisk:YES]; [request setRequestMethod:@"PUT"]; [request addRequestHeader:@"x-amz-acl" value:@"private"]; [request addRequestHeader:@"Content-Type" value:contentType]; [request addRequestHeader:@"Date" value:date]; NSString *canonicalizedAmzHeaders = @"x-amz-acl:private"; NSString *canonicalizedResource = [NSString stringWithFormat:@"/%@/%@",bucket,path]; NSString *stringToSign = [NSString stringWithFormat:@"PUT\n\n%@\n%@\n%@\n%@",contentType,date,canonicalizedAmzHeaders,canonicalizedResource]; NSString *signature = [self base64forData:[self HMACSHA1withKey:secretAccessKey forString:stringToSign]]; NSString *auth = [NSString stringWithFormat:@"AWS %@:%@",accessKey,signature]; [request addRequestHeader:@"Authorization" value:auth]; [request start]; NSLog(@"%@",[request responseString]); } // Source: http://stackoverflow.com/questions/476455/is-there-a-library-for-iphone-to-work-with-hmac-sha-1-encoding - (NSData *)HMACSHA1withKey:(NSString *)key forString:(NSString *)string { NSData *clearTextData = [string dataUsingEncoding:NSUTF8StringEncoding]; NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding]; uint8_t digest[CC_SHA1_DIGEST_LENGTH] = {0}; CCHmacContext hmacContext; CCHmacInit(&amp;hmacContext, kCCHmacAlgSHA1, keyData.bytes, keyData.length); CCHmacUpdate(&amp;hmacContext, clearTextData.bytes, clearTextData.length); CCHmacFinal(&amp;hmacContext, digest); return [NSData dataWithBytes:digest length:CC_SHA1_DIGEST_LENGTH]; } //Source http://www.cocoadev.com/index.pl?BaseSixtyFour - (NSString *)base64forData:(NSData *)data { static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; if ([data length] == 0) return @""; char *characters = malloc((([data length] + 2) / 3) * 4); if (characters == NULL) return nil; NSUInteger length = 0; NSUInteger i = 0; while (i &lt; [data length]) { char buffer[3] = {0,0,0}; short bufferLength = 0; while (bufferLength &lt; 3 &amp;&amp; i &lt; [data length]) buffer[bufferLength++] = ((char *)[data bytes])[i++]; // Encode the bytes in the buffer to four characters, including padding "=" characters if necessary. characters[length++] = encodingTable[(buffer[0] &amp; 0xFC) &gt;&gt; 2]; characters[length++] = encodingTable[((buffer[0] &amp; 0x03) &lt;&lt; 4) | ((buffer[1] &amp; 0xF0) &gt;&gt; 4)]; if (bufferLength &gt; 1) characters[length++] = encodingTable[((buffer[1] &amp; 0x0F) &lt;&lt; 2) | ((buffer[2] &amp; 0xC0) &gt;&gt; 6)]; else characters[length++] = '='; if (bufferLength &gt; 2) characters[length++] = encodingTable[buffer[2] &amp; 0x3F]; else characters[length++] = '='; } return [[[NSString alloc] initWithBytesNoCopy:characters length:length encoding:NSASCIIStringEncoding freeWhenDone:YES] autorelease]; } </code></pre>
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    1. COYou Rock pokeb. Really appreciate the help. My canonicalizedAmzHeader was all screwy. I'm having one other problem however... I tried to "add" the request to a queue and start it from there but to no avail. Here is my code: [networkQueue cancelAllOperations]; [request..... definitions go here]; [networkQueue addOperation:request]; [networkQueue go]; What things should I be on the look out for when adding a request to a queue? thanks again for the help! L.
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    2. CODid you create the queue first? (eg: [self setNetworkQueue:[ASINetworkQueue queue]])
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    3. COYou were right again. My networkQueue instance variable was never getting initialized. You ARE the man. Really appreciate the help.
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