通过imagepicker将图像上传到服务器不起作用（需要解决方案） [英] Uploading an image to a server through imagepicker doesnt work (need solution)

问题描述

作为此问题的后续跟踪，将图片上传到服务器无效（在那里你可以找到我的php文件）我意识到它为什么不起作用。但我不知道解决方案。正如你在代码中看到的那样（几行向下）我将我的图像提供给php文件，但它并没有将其识别为图像。所以我希望有人可以帮助它，并且知道（可能是显而易见的）解决方案：

As a follow up from this question Uploading images to server doesn't work (There you can find my php file) I realized why it isn't working. But I don't know the solution. As you can see in the code (a few lines down) I give my image to the php file, but it doesnt recognize it as an image. So I hope someone can help with it and knows the (probably obvious) solution:

 - (IBAction)changepic:(id)sender{

    picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    [self presentModalViewController:picker animated:YES];
    }

 - (void)imagePickerController:(UIImagePickerController *) Picker didFinishPickingMediaWithInfo:(NSDictionary *)info{

double compressionRatio=1;
NSData *imageData=UIImageJPEGRepresentation([info objectForKey:UIImagePickerControllerOriginalImage],compressionRatio);
while ([imageData length]>50000) { 
    compressionRatio=compressionRatio*0.50;
    imageData=UIImageJPEGRepresentation([info objectForKey:UIImagePickerControllerOriginalImage],compressionRatio);
}

UIImage *yourUIImage;
yourUIImage = [info objectForKey:UIImagePickerControllerOriginalImage];
imageData = [NSKeyedArchiver archivedDataWithRootObject:yourUIImage];
[[NSUserDefaults standardUserDefaults] setObject:imageData forKey:@"bild"];
[[NSUserDefaults standardUserDefaults] synchronize];



NSData *imageData2 = UIImageJPEGRepresentation(yourUIImage, 90);
NSString *urlString = @"http://myserver/upload.php";


NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];

NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
[request addValue:contentType forHTTPHeaderField: @"Content-Type"];

NSMutableData *body = [NSMutableData data];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"image\"; filename=\"imagename.jpg\"\r\n",index] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:imageData2]];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// setting the body of the post to the reqeust
[request setHTTPBody:body];

NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

NSLog(@"%@", returnString);

[self dismissModalViewControllerAnimated:YES];
}

推荐答案

我把它变成了可以在所有项目中包含和使用的简单功能。在我的例子中，远程服务器是一个PHP脚本。

I have made this into a simple function that can be included and used in all projects. In my case the remote server is a PHP script.

这是函数的使用方式：

// form text fields and values
NSArray *formfields = [NSArray arrayWithObjects:@"name", @"date", @"purpose", @"comment", nil];
NSArray *formvalues = [NSArray arrayWithObjects:@"Write Blog", @"31-03-2011", @"For Test", @"Just Comment", nil];
NSDictionary *textParams = [NSDictionary dictionaryWithObjects:formvalues forKeys:formfields];

// if, there are any images in the form
NSArray *images = [NSArray arrayWithObjects:@"myimage1.png", @"myimage2.png", nil];

// submit the form
[self doPostWithText:textParams andImage:images];

这是doPostWithText的函数定义：andImage：

This is the function definition for doPostWithText:andImage:

- (void) doPostWithText:(NSDictionary *)textParams andImage:(NSArray *)imageParams
{
    NSString *urlString = @"http://mysite.com/myscript.php";
    NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@"POST"];

    NSMutableData *body = [NSMutableData data];

    NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
    [request addValue:contentType forHTTPHeaderField:@"Content-Type"];

    // add the image form fields
    for (int i=0; i<[imageParams count]; i++) {
        [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"Content-Disposition: attachment; name=\"image%d\"; filename=\"%@\"\r\n", i, [imageParams objectAtIndex:i]] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[NSData dataWithData:UIImageJPEGRepresentation([UIImage imageNamed:[imageParams objectAtIndex:i]], 90)]];
        [body appendData:[[NSString stringWithString:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

    }

    // add the text form fields
    for (id key in textParams) {
        [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", key] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithString:[textParams objectForKey:key]] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithString:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    }

    // close the form
    [body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    // set request body
    [request setHTTPBody:body];

    // send the request (submit the form) and get the response
    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

    NSLog(@"%@", returnString);
}

在PHP方面，我会得到这样的数据：

On the PHP side I will get the data like this:

$_POST

Array
(
    [name] => Write Blog
    [purpose] => For Test
    [comment] => Just Comment
    [date] => 31-03-2011
)

$_FILES


Array
(
    [image0] => Array
        (
            [name] => myimage1.png
            [type] => application/octet-stream
            [tmp_name] => /junk/temp/phpsKiVxx
            [error] => 0
            [size] => 23602
        )

    [image1] => Array
        (
            [name] => myimage2.png
            [type] => application/octet-stream
            [tmp_name] => /junk/temp/phpNVGDoB
            [error] => 0
            [size] => 4620
        )

)

这篇关于通过imagepicker将图像上传到服务器不起作用（需要解决方案）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！