在 curl 中将原始图像数据作为多部分/表单数据发布 [英] Posting raw image data as multipart/form-data in curl

问题描述

我正在尝试使用 multipart/form-data 标头在 PHP 中发布带有 cURL 的图像，因为我发送到的 API 期望图像作为多部分表单发送.

I am trying to post an image with cURL in PHP using multipart/form-data header since API that I am sending to is expecting image to be sent as multi-part form.

我在处理其他请求时与 API 通信没有问题；仅发布图片是个问题.

I don't have problems talking to the API with other requests; only posting an image is an issue.

我在客户端使用此表单:

I am using this form on client side:

<form action="http://myServerURL" method="POST" enctype="multipart/form-data">
    <input type="file" name="file" />
    <input type="Submit">
</form>

这是我要发布到的服务器(在这里我试图将此数据转发到 API):

and this is the server I am posting to (here I am trying to post this data forward to an API):

$ch = curl_init($url);
curl_setopt ($ch, CURLOPT_POST, 1);
curl_setopt ($ch, CURLOPT_POSTFIELDS, $imgRawData); // <-- raw data here hm?
curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt ($ch, CURLOPT_COOKIEFILE, $cookieJar);
curl_setopt( $ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLINFO_HEADER_OUT, 1); <-- using this as I wanted to check if HTTPHEADER is set
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: multipart/form-data')); <-- setting content-type header?
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1);

// i get response from the server
$response = curl_exec( $ch );

// with this I can check what kind of content type the last request had?
$requestContentType = curl_getinfo($ch,CURLINFO_CONTENT_TYPE);
echo "<br>request Content Type was:".$requestContentType."<br>";    

curl_close($ch);

echo "<br><b>SERVER POST IMAGE RESPONSE:</b><br>";
echo $response;

使用下面的代码，我可以看到我的请求标头:

With the code below I am able to see my request headers:

curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLINFO_HEADER_OUT, true);

var_dump(curl_getinfo($ch));

请求头中的内容类型现在正确显示.但似乎图像没有像 API 预期的那样正确发送.不幸的是，我无权访问 API...

The content-type in request-headers is shown correctly now. But it seems the image is not send correctly as API would expect. Unfortunately I don't have access to the API...

感谢任何帮助，谢谢

推荐答案

如果有人遇到同样的问题:检查 this 正如@PravinS 所建议的那样.我使用了与那里显示的完全相同的代码，它非常适合我.

In case anyone had the same problem: check this as @PravinS suggested. I used the exact same code as shown there and it worked for me perfectly.

这是帮助我们的服务器代码的相关部分:

This is the relevant part of the server code that helped:

if (isset($_POST['btnUpload']))
{
$url = "URL_PATH of upload.php"; // e.g. http://localhost/myuploader/upload.php // request URL
$filename = $_FILES['file']['name'];
$filedata = $_FILES['file']['tmp_name'];
$filesize = $_FILES['file']['size'];
if ($filedata != '')
{
    $headers = array("Content-Type:multipart/form-data"); // cURL headers for file uploading
    $postfields = array("filedata" => "@$filedata", "filename" => $filename);
    $ch = curl_init();
    $options = array(
        CURLOPT_URL => $url,
        CURLOPT_HEADER => true,
        CURLOPT_POST => 1,
        CURLOPT_HTTPHEADER => $headers,
        CURLOPT_POSTFIELDS => $postfields,
        CURLOPT_INFILESIZE => $filesize,
        CURLOPT_RETURNTRANSFER => true
    ); // cURL options
    curl_setopt_array($ch, $options);
    curl_exec($ch);
    if(!curl_errno($ch))
    {
        $info = curl_getinfo($ch);
        if ($info['http_code'] == 200)
            $errmsg = "File uploaded successfully";
    }
    else
    {
        $errmsg = curl_error($ch);
    }
    curl_close($ch);
}
else
{
    $errmsg = "Please select the file";
}
}

html 表单应该类似于:

html form should look something like:

<form action="uploadpost.php" method="post" name="frmUpload" enctype="multipart/form-data">
<tr>
  <td>Upload</td>
  <td align="center">:</td>
  <td><input name="file" type="file" id="file"/></td>
</tr>
<tr>
  <td>&nbsp;</td>
  <td align="center">&nbsp;</td>
  <td><input name="btnUpload" type="submit" value="Upload" /></td>
</tr>

这篇关于在 curl 中将原始图像数据作为多部分/表单数据发布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！