php - 从 iPhone 发布图像时出现奇怪问题

Question

我在从 iPhone 上传图片时遇到了一个非常奇怪的问题。当我从 iPhone 上传图片时，服务器上的图片已创建，但尺寸为 0。

我使用了许多 PHP 函数从字节接收图像，但都是徒劳的，从 iPhone 我正在以二进制形式(多部分内容类型)发送图像到 httppost。

所有代码如下。以下是我使用过的各种 PHP 方法，但它们都不起作用。

$id=rand() ;  // for image name

//=====================1st method========================   
if(isset($_REQUEST['image_string'])) {      
    $imgData =@$_REQUEST['image_string'];

    header('Content-Type:image/jpg; charset=utf-8');     

    $file = fopen("new_arrivals_img/".$id.".jpg", 'wb');
    fwrite($file, $binary);   
    fclose($file);   
}    

//========================2nd method=====================

if(isset($_REQUEST['image_string'])) {
     $imgData =$_REQUEST['image_string'];
    $im = imagecreatefromstring($imgData);

    $src="new_arrivals_img/".$id.".png";
    imagepng($im,$src);
}


//=======================3rd method==================

if(isset($_REQUEST['image_string'])) {    
    $target_path = "new_arrivals_img/";
    $target_path = $target_path.basename($_FILES['image_string']['name']);  

    move_uploaded_file($_FILES['image_string']['tmp_name'], $target_path);              
}

//===================4th method ===========

if(isset($_REQUEST['image_string'])) {    
    $imageString = file_get_contents($_REQUEST['image_string']);
    $save = file_put_contents("new_arrivals_img/".$id.".png",$_REQUEST['image_string']);   
}   

//==========================5th method =================

if(isset($_REQUEST['image_string'])) {   
    copy($_REQUEST['image_string'], "new_arrivals_img/".$id.".png");   
}   

//======6th method =========================================


if(isset($_REQUEST['image_string'])) {      
    $url = $_REQUEST['image_string'];
    $dir = "new_arrivals_img/";
    $lfile = fopen($dir . basename($url), "w");

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)');
    curl_setopt($ch, CURLOPT_FILE, $lfile);
    curl_exec($ch);
    fclose($lfile);
    curl_close($ch);
}

iOS 代码如下:

//image_string3 is parameter in which imagedata1 passed and server url is // http://192.95.48.44/image_binary/index.php



    NSData *imageData1 = UIImageJPEGRepresentation(myImage,0.2);     //change Image to NSData

        if (imageData1 != nil)
        {

            NSString *urlString = @"http://192.95.48.44/image_binary/index.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 stringWithString:@"Content-Disposition: form-data; name=\"image_string\"; filename=\"test123.jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

            [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
            [body appendData:[NSData dataWithData:imageData1]];
            [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
            // setting the body of the post to the reqeust
            [request setHTTPBody:body];

            NSLog(@"body %@",body);
            NSLog(@"request %@",request);
            // now lets make the connection to the web
            NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
            NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
            NSLog(@"returning strin %@",returnString);
            NSLog(@"finish");

        }

Answer 1

我认为您在 Objective-C 中的函数是正确的。但是，我认为您使用的 PHP 端方法不正确。这是我使用的那个，它完美地工作:

function uploadPicture(){

    if ($_FILES["file"]["name"] == "noimage.jpg"){
        return "noimage.jpg";
    }

    $uploadLocation = "failed";

    $allowedExts = array("jpg", "jpeg", "gif", "png");

    $extension = end(explode(".", $_FILES["file"]["name"]));
    echo "file size" . ($_FILES["file"]["size"] / 1024) . "KB";

    if (($_FILES["file"]["size"] < 500000) && in_array($extension, $allowedExts)){

        if ($_FILES["file"]["error"] > 0) {
            echo "Return Code: " . $_FILES["file"]["error"] . "<br />";
        } else {
            echo "Upload: " . $_FILES["file"]["name"] . "<br />";
            echo "Type: " . $_FILES["file"]["type"] . "<br />";
            echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
            echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br />";

            if (file_exists("upload/" . $_FILES["file"]["name"])) {
                echo $_FILES["file"]["name"] . " already exists. ";
            } else {
                move_uploaded_file($_FILES["file"]["tmp_name"],
                    "upload/" . $_FILES["file"]["name"]);
                echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
                $uploadLocation = "upload/" . $_FILES["file"]["name"];
            }
        }
    } else {
        echo "invalid file";
    }

    return $uploadLocation;
}

为了完整起见，我将添加我在 Objective-C 端使用的方法，以便您可以比较是否发现服务器端不是问题所在。但是，正如我之前所说，我认为您的方法很好，问题出在服务器端，我非常彻底地检查了我们的代码以确保它们相同。

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
[request setHTTPShouldHandleCookies:NO];
[request setTimeoutInterval:30];
[request setHTTPMethod:@"POST"];

NSString * boundary = @"qerklasdfe2309asdf123asdfjkl";

// the file name comes from the user_id as the first character, and a random string 20 characters long as the second
// there is a negligable chance of repititions here
NSString * fileName = [[NSString alloc] initWithFormat:@"%@%@", params[@"user_id"], [[self class] genRandStringLength:20]];

// set Content-Type in HTTP header
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
[request setValue:contentType forHTTPHeaderField: @"Content-Type"];

// post body
NSMutableData *body = [NSMutableData data];

if (image == nil){
    NSLog(@"empty image");
    fileName = @"noimage";
} 
// add image data

NSData *imageData = UIImageJPEGRepresentation(image, 1.0);

[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@.jpg\"\r\n", @"file", fileName] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:imageData];
[body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

// add params (all params are strings)
for (NSString *param in params) {
    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", param] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"%@\r\n", params[param]] dataUsingEncoding:NSUTF8StringEncoding]];
}


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

// setting the body of the post to the reqeust
[request setHTTPBody:body];

// set the content-length
NSString *postLength = [NSString stringWithFormat:@"%d", [body length]];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];

// set URL
NSURL * requestURL = [NSURL URLWithString:@"http://www.mywebsite.com/myscript.php"];
[request setURL:requestURL];
;

NSURLConnection * theConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
NSLog(@"%@", theConnection);