从iPhone上传图片时出现了奇怪的问题

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上传图像时，服务器上的图像被创建，但大小为0。

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

所有代码如下所示。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:@"rn--%@rn",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
            [body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name="image_string"; filename="test123.jpg"rn"] dataUsingEncoding:NSUTF8StringEncoding]];
            [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-streamrnrn"] dataUsingEncoding:NSUTF8StringEncoding]];
            [body appendData:[NSData dataWithData:imageData1]];
            [body appendData:[[NSString stringWithFormat:@"rn--%@--rn",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

我认为你在Objective-C中的功能是正确的。然而，我认为你使用的PHP方法是不正确的。这是我使用的，它工作得很好:

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;
}

为了彻底起见，我将添加我在Objective-C端使用的方法，以便您可以比较，如果您发现服务器端不是问题。然而，正如我之前所说，我认为你的方法是好的，问题是在服务器端，我检查了我们的代码非常彻底，以确保它们是相同的。

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:@"--%@rn", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name="%@"; filename="%@.jpg"rn", @"file", fileName] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[@"Content-Type: image/jpegrnrn" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:imageData];
[body appendData:[[NSString stringWithFormat:@"rn"] dataUsingEncoding:NSUTF8StringEncoding]];
// add params (all params are strings)
for (NSString *param in params) {
    [body appendData:[[NSString stringWithFormat:@"--%@rn", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name="%@"rnrn", param] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"%@rn", params[param]] dataUsingEncoding:NSUTF8StringEncoding]];
}

[body appendData:[[NSString stringWithFormat:@"--%@--rn", 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);

Answer 2

在这个问题上花了两天时间后，我终于得到了解决方案，这是我的服务器不允许我动态创建图像或通过编程的问题。

虽然我已经给我的文件夹完全的权限(读，写，更新或777)，我正在创建图像。

我只是改变了服务器，它工作得很好，我使用的代码和AdamG提供的代码都为我工作。