Question

我正在尝试以二进制格式循环存储在MS SQL数据库上的一堆图像，并使用php将它们移动到Amazon云上的存储桶中。我已经尝试了一些方法，但没有成功，而我能够在内存中获取图像文件的实例，这是我无法上传的。阅读了以下帖子：Creating an image without storing it as a local file，我想也许使用Imagick库会更好，但仍然没有运气。

所以我的问题是，我可以使用Undesigned S3类或实际的AWS SDK从读取到PHP内存的图像上传到云端吗？

这是我到目前为止创建的一些代码，以便了解我所采用的方法。我正在使用Undesigned S3类在云上创建对象。图像表上字段上的文件是“IMAGE”类型，包含文件的字符串引用。任何提示，指示，帮助都会很棒。

// get the images that have not been moved to the cloud yet
$obj_File = new Images();
$aImages = $obj_File->Select_ImagesNotOnCloud();
unset($obj_File);

// set the start time
$mtime = microtime(); 
$mtime = explode(" ",$mtime); 
$mtime = $mtime[1] + $mtime[0]; 
$starttime = $mtime; 

// upload the image to the cloud
$images_processed = 0;

// get and include the Amazon sdk
require_once('../includes/classes/library/plugins/amazon/undesigned/S3.php');
$s3 = new S3("key", "secretkey");

$sBucket = 'testbucket';

// loop through each image and move to the cloud
foreach($aImages as $aImage) {

    // save the file to the file server with a temporary name
    $oImage = imagecreatefromstring($aImage['FileData']);

    // generate random filename
    $mtime = microtime(); 
    $mtime = explode(" ",$mtime); 
    $mtime = $mtime[1] + $mtime[0]; 
    $sMicrotime = $mtime; 
    $sFilename = date('Ymdhms') . $sMicrotime;
    $sFilename = md5(str_replace(array(' ','.'), '', $sFilename));

    // get the correct file extension
    $sFilename .= '.' . $aImage['FileExtension'];

    // Create Imagick object - the new bit I've just started playing with as per https://stackoverflow.com/questions/189368/creating-an-image-without-storing-it-as-a-local-file/189410#189410
    $im = new Imagick();

    // Convert image into Imagick
    $im->readimageblob($image);

    // Upload an object from a resource (requires size):
    $result = $s3->putObject($s3::inputResource($im->getimageblob(), $im->getSize()), $sBucket, $sFilename, $s3::ACL_PUBLIC_READ);

    // try and put the object into the bucket on the cloud
    $response = $s3->putObject(
        $s3->inputResource($oImage, $aImage['FileSize']),
        $sBucket,
        $sFilename,
        S3::ACL_PUBLIC_READ
    );

    echo("<pre>"); var_dump($response); echo("</pre>"); 

    echo('<br /><br />File_Id = ' . $aImage['File_Id'] .', filename generated = '. $sFilename .'<br />');
    $images_processed++;

    // clear the image object
    unset($oImage);
}

// get the end time and calculate the seconds it took to run the script
$mtime = microtime(); 
$mtime = explode(" ",$mtime); 
$mtime = $mtime[1] + $mtime[0]; 
$endtime = $mtime; 

// get final time taken to run script
$sTotalTime = ($endtime - $starttime);
$aTime = explode('.', $sTotalTime);
$sTotalTime = $aTime[0] .'.'. substr($aTime[1], 0, 4);

Answer 1

<强>解

如果其他人遇到同样的问题，请为此提供一些解决方案。无法将图像直接从数据库中提取到云端，因此选择获取文件并将其保存到服务器，然后将该文件上传到云端。

我必须使用Imajick库，但下面是代码。

// path to upload the file to the server prior to uploading to the cloud
$sServerUploadFolder = 'D:\Inetpub\wwwroot\site\\tmp\\';

// set parent folder name on the bucket
$sBucketParentFolder = 'images/';

// get the images that have not been moved to the cloud yet
$aImages = GetImages();     // gets an array of image data including the FileData which is in image format from MS SQL database

// set the start time
$mtime = microtime(); 
$mtime = explode(" ",$mtime); 
$mtime = $mtime[1] + $mtime[0]; 
$starttime = $mtime; 

// upload the image to the cloud
$images_processed = 0;

// set the bucket name to upload to
$sBucket = 'testbucket';

// loop through each image and move to the cloud
foreach($aImages as $aImage) {

    // generate random filename
    $mtime = microtime(); 
    $mtime = explode(" ", $mtime); 
    $mtime = $mtime[1] + $mtime[0]; 
    $sMicrotime = $mtime;
    $sFilenameToSave = date('Ymdhms') . $sMicrotime;
    $sFilenameToSave = md5(str_replace(array(' ','.'), '', $sFilenameToSave));

    // get the correct file extension
    $sFilenameToSave .= '.' . $aImage['FileExtension'];

    // Create Imagick object
    $oImagick = new Imagick();

    // Convert image into Imagick
    $oImagick->readimageblob($aImage['FileData']);

    // write the image to the temporary storage folder on the server
    $oImagick->writeimage($sServerUploadFolder.$sFilenameToSave);

    // upload the file to the cloud
    $response = AWSCreateObject($sBucket, $sFilenameToSave, $sServerUploadFolder.$sFilenameToSave, $sBucketParentFolder);

    // increment the counter for images processed
    $images_processed++;

    // delete the image from the temp storage folder
    unlink($sServerUploadFolder.$sFilenameToSave);

    // clear the image object
    unset($oImagick);
}

// get the end time and calculate the seconds it took to run the script
$mtime = microtime(); 
$mtime = explode(" ",$mtime); 
$mtime = $mtime[1] + $mtime[0]; 
$endtime = $mtime; 

// get final time taken to run script
$sTotalTime = ($endtime - $starttime);
$aTime = explode('.', $sTotalTime);
$sTotalTime = $aTime[0] .'.'. substr($aTime[1], 0, 4); 

// clear objects
unset($obj_File);

// final output
echo "<h1>images processed = $images_processed, time taken: $sTotalTime seconds</h1>";



/**
 * uploads a file to the cloud - should only be used for files that are reasonably small in bucket terms, ie. 10mb or less
 * @param string    $param_str_bucket           name of the bucket to upload to
 * @param string    $param_str_filename         name of the file to be uploaded to the bucket, eg. personphoto.jpg
 * @param string    $param_str_upload_path      full path to the file in the bucket, eg. images/photos/personphoto.jpg
 * @param string    $param_str_parent_folder    optional - name of the parent folder in which to upload the object into
 * @param array     $param_arr_meta             optional - meta data values for the object
 * @param boolean   $param_bln_public_access    optional - declares which acl type to use for the upload, ACL_PUBLIC or ACL_PRIVATE, defaults to ACL_PUBLIC
 */
function AWSCreateObject($param_str_bucket, $param_str_filename, $param_str_upload_path, $param_str_parent_folder = null, $param_arr_meta = null, $param_bln_public_access = 1) {
    // load the Amazon class
    require_once 'sdk-1.5.7/sdk.class.php';

    // Instantiate the Amazon class
    $S3 = new AmazonS3();

    // set the acl type
    $sACL = isset($param_bln_public_access) && $param_bln_public_access == 1 ? AmazonS3::ACL_PUBLIC : AmazonS3::ACL_PRIVATE;

    // check the $param_str_parent_folder value
    if(isset($param_str_parent_folder)) {
        if(substr($param_str_parent_folder, -1) != '/') {
            $param_str_parent_folder .= '/';
        }
    }

    // create the object on the cloud
    $response = $S3->create_object
    (
        $param_str_bucket           // bucket to upload the file to
    ,   $param_str_parent_folder.$param_str_filename        // filename to use for the object to be saved

        // Optional configuration
    ,   array(
            'fileUpload'    => $param_str_upload_path
        ,   'acl'           => $sACL
        ,   'storage'       => AmazonS3::STORAGE_STANDARD

        // Object metadata
        ,   'meta' => $param_arr_meta
        )
    );


    // tidy up
    unset($S3);

    // return result
}

将从数据库读取的图像上载到Amazon云

1 个答案: