发送数据- NSMutableURLRequest

Question

我正在通过PHP脚本发送一封电子邮件。使用NSMutableURLRequest可以很好地工作，但我也想在电子邮件中附加一个图像。

下面是我使用的代码：

    NSMutableURLRequest *request = 
    [[NSMutableURLRequest alloc] initWithURL:
    [NSURL URLWithString:@"http://example.com/email.php"]];

    [request setHTTPMethod:@"POST"];

    NSString*subject = [NSString stringWithFormat:@"Images from %@",[[UIDevice currentDevice] name]];   

    NSString*to = [[NSUserDefaults standardUserDefaults] objectForKey:@"PreferredPrinterEPrint"];   

    NSString *postString = [NSString stringWithFormat:@"to=%@&message=%@&subject=%@",to,@"hi",subject];

    [request setValue:[NSString 
                       stringWithFormat:@"%d", [postString length]] 
    forHTTPHeaderField:@"Content-length"];

    [request setHTTPBody:[postString 
                          dataUsingEncoding:NSUTF8StringEncoding]];

    [[NSURLConnection alloc] initWithRequest:request delegate:self];

我看过一篇here文章，描述了发送图片，但我不知道如何将两者结合起来。有没有人能帮我个忙？

谢谢!

Answer 1

有一个名为ASIFormDataRequest的类，它使得发布数据变得非常容易，并且包含了用一行附加文件的能力。我强烈推荐它。

Answer 2

发送JPEG图像的示例：

NSMutableURLRequest *request =  [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://example.com/email.php"]];

[request setHTTPMethod:@"POST"];

NSString *boundary = @"Some string as you like";
NSString *value = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
[request setValue:value forHTTPHeaderField:@"Content-Type"];

NSString *subject = [NSString stringWithFormat:@"Images from %@", [[UIDevice currentDevice] name]];   
NSString *to = [[NSUserDefaults standardUserDefaults] objectForKey:@"PreferredPrinterEPrint"];   

NSData *fileData = [NSData dataWithContentsOfFile:<file path>]

NSMutableString *postDataString = @"".mutableCopy;
[postDataString appendFormat:@"--%@\r\n", boundary];
[postDataString appendFormat:@"Content-Disposition: form-data; name=\"to\"\r\n"];
[postDataString appendFormat:@"\r\n%@\r\n", to];
[postDataString appendFormat:@"--%@\r\n", boundary];
[postDataString appendFormat:@"Content-Disposition: form-data; name=\"message\"\r\n"];
[postDataString appendFormat:@"\r\n%@\r\n", @"hi"];
[postDataString appendFormat:@"--%@\r\n", boundary];
[postDataString appendFormat:@"Content-Disposition: form-data; name=\"subject\"\r\n"];
[postDataString appendFormat:@"\r\n%@\r\n", subject];
[postDataString appendFormat:@"--%@\r\n", boundary];
[postDataString appendFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n", <file name>, <file name>];
[postDataString appendFormat:@"Content-Type: image/jpg\r\n"];
[postDataString appendFormat:@"Content-Transfer-Encoding: binary\r\n\r\n"];

NSMutableData *postData = [postDataString dataUsingEncoding:NSUTF8StringEncoding].mutableCopy;

[postData appendData:fileData];

[postData appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

[request setValue:[NSString stringWithFormat:@"%d", postDataString.length]  forHTTPHeaderField:@"Content-length"];
[request setHTTPBody:postData];

[[NSURLConnection alloc] initWithRequest:request delegate:self];