将图像从 iOS 应用程序上传到 php --- 不能完全正确 --- 我错过了什么?-php问题

Upload image from iOS app to php --- Can#39;t quite get it right --- What am I missing?(将图像从 iOS 应用程序上传到 php --- 不能完全正确 --- 我错过了什么?)

本文介绍了将图像从 iOS 应用程序上传到 php --- 不能完全正确 --- 我错过了什么?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

首先，我知道这个问题已经被问了一千次了.我再次问，因为我已经尝试了其他示例中的解决方案，但它们对我不起作用，我不知道为什么.每个人的方法似乎略有不同.

Firstly, I know this question has been asked a thousand times. I'm asking again because I've tried the solutions in the other examples and they are not working for me and I don't know why. Everyone seems to have a slightly different approach.

NSData *imageData =  UIImagePNGRepresentation(form.image);
NSURL *url = [NSURL URLWithString:@"myscript.php"];
NSMutableString *postParams = [[NSMutableString alloc] initWithFormat:@"&image=%@", imageData]];

NSData *postData = [postParams dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [[NSString alloc] initWithFormat:@"%d", [postData length]];

NSMutableURLRequest *connectRequest = [[NSMutableURLRequest alloc] init];
[connectRequest setURL:url];
[connectRequest setHTTPMethod:@"POST"];
[connectRequest setValue:postLength forHTTPHeaderField:@"Content-Length"];
[connectRequest setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
//[connectRequest setValue:@"image/png" forHTTPHeaderField:@"Content-Type"];
[connectRequest setHTTPBody:postData];

NSData *receivedData;
NSDictionary *jsonData;

NSURLConnection *connectConnection = [[NSURLConnection alloc] initWithRequest:connectRequest delegate:self];

NSError *error = nil;

if (!connectConnection) {
    receivedData = nil;
    NSLog(@"The connection failed!");
} else {
    NSLog(@"Connected!");
    receivedData = [NSURLConnection sendSynchronousRequest:connectRequest returningResponse:NULL error:&error];
}

if (!receivedData) {
    NSLog(@"Data fetch failed: %@", [error localizedDescription]);
} else {
    NSLog(@"The data is %lu bytes", (unsigned long)[receivedData length]);
    NSLog(@"%@", receivedData);

    if (NSClassFromString(@"NSJSONSerialization")) {
        id object = [NSJSONSerialization JSONObjectWithData:receivedData options:0 error:&error];

        if (!object) {
            NSLog(@"JSON Serialization failed: %@", [error localizedDescription]);
        }

        if ([object isKindOfClass:[NSDictionary class]]) {
            jsonData = object;
            NSLog(@"json data: %@", jsonData);
        }
    }
}

目前我在 postParams 中传递 NSData 并使用这个 php 脚本:

At the moment I am passing the NSData in the postParams and using this php script:

if (isset($_POST['image']) && !empty($_POST['image'])) {

     if (file_put_contents('images/test.png', $_POST['image'])) {
           echo '{"saved":"YES"}'; die();
     } else {
           echo '{"saved":"NO"}'; die();     
     }
}

这是将数据保存到文件中，但我无法打开它，因为它已损坏或诸如此类.这几乎是最后的努力，我真的没想到它会以这种方式工作，但它与我到目前为止所做的一样接近.

This is saving the data to a file but I can't open it as it is corrupted or some such thing. This was pretty much a last ditch effort and I didn't really expect it to work this way but it's as close as I've come so far to getting it right.

我尝试过使用各种内容标头/边界/$_FILES/enctype 内容类型方法，但我什至无法将其正确发送到脚本.

I've tried using various content header/ boundary / $_FILES / enctype content-type methods but I can't even get it to send to the script properly like that.

顺便说一句，我不只是发送图像数据，我还在 postParams 中发布其他值，这些值只是字符串、整数等.

有没有人对此有任何建议或知道任何好的资源?

Does anyone have any suggestions or know of any good sources out there for this?

感谢您提供的任何帮助.

Thanks for any assistance offered.

遵循以下答案中给出的建议后的当前状态(以及来自程序其他部分的更多信息):

Current state after following advice given in answers below (also, further information from other parts of program):

图像的初始捕获:

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];

    [self.view endEditing:YES];

    __unused form *form = self.form;

    form.signature = self.signatureDrawView.bp;

    UIGraphicsBeginImageContext(self.signatureDrawView.bounds.size);
    [self.signatureDrawView.layer renderInContext:UIGraphicsGetCurrentContext()];
    campaignForm.signatureImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
}

其中 signatureDrawView 是 UIView，form.signature 是 UIBezierpath.

where the signatureDrawView is a UIView and the form.signature is a UIBezierpath.

那么……

NSData *sigImage =  UIImagePNGRepresentation(campaignForm.signatureImage);

传递给以下函数:

- (void)uploadImage:(NSData *)imageData
{
    NSMutableURLRequest *request;
    NSString *urlString = @"https://.../upload.php";
    NSString *filename = @"uploadTest";
    request= [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@"POST"];
    NSString *boundary = @"---------------------------14737809831466499882746641449";
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
    [request addValue:contentType forHTTPHeaderField: @"Content-Type"];
    NSMutableData *postbody = [NSMutableData data];
    [postbody appendData:[[NSString stringWithFormat:@"
--%@
",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postbody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name="file"; filename="%@.png"
", filename] dataUsingEncoding:NSUTF8StringEncoding]];
    [postbody appendData:[@"Content-Type: application/octet-stream

" dataUsingEncoding:NSUTF8StringEncoding]];
    [postbody appendData:[NSData dataWithData:imageData]];
    [postbody appendData:[[NSString stringWithFormat:@"
--%@--
",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [request setHTTPBody:postbody];

    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    NSString *returnString;
    returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
    NSLog(@"%@", returnString);
}

upload.php 看起来像:

upload.php looking like:

    if ($_FILES["file"]["error"] > 0) {
        echo '{"file":"'.$_FILES['file']['error'].'"}';
        die();
    } else {
        $size = $_FILES["file"]["size"] / 1024;
        $upload_array = array(
                    "Upload"=>$_FILES["file"]["name"],
                    "Type"=>$_FILES["file"]["type"],
                    "Size"=>$size,
                    "Stored in"=>$_FILES["file"]["tmp_name"]
                    );
        //echo json_encode($upload_array);
        if (move_uploaded_file($_FILES["file"]["tmp_name"], "signatures/" . $_FILES["file"]["name"])) {
            echo '{"success":"YES"}';
            die();  
        } else { 
            echo '{"success":"NO"}';
            die();  
        }
        die();
    }

这给了我 {success:NO} 输出，并且 $upload_array 转储显示空值.

This is giving me the {success:NO} output and the $upload_array dump shows null values.