CodeIgniter上传和调整大小问题

Question

我花了几天时间尝试根据文档中的示例来完成这项工作,但我遗漏了一些东西,或者我只是愚蠢!

我有一个CMS应用程序,用户上传图像以便以非常固定的布局显示.我们不希望限制上传图像的文件大小,而是在它到达后"处理"它.

图像需要宽615像素,但直接从数码相机上传的一些图像是2500X2000且更大,因此这是至关重要的.

我拼凑了手册中的代码,图像成功上传到CMS应用程序中的文件夹.但是,图像未调整大小.

如果我让它重新调整大小,我的计划是将图像呈现给用户使用jCrop裁剪(最终图像为615X275,并且可能必须在调整大小后裁剪高度)然后使用codeigniter来FTP使用原始名称将图像添加到其网站的设施文件夹中.

在这件事上我将不胜感激!

这是我的代码:

function do_feature_upload() {
        $imageName = $this->uri->segment(3);
        //echo $imageName;

        // Where the file is going to be placed
        $config['upload_path'] =  "./uploads/".$_SESSION['dbPropNumber'];
        $config['allowed_types'] = 'jpg|jpeg';
        $config['max_size'] = '0';
        $config['file_name'] = $imageName.'.jpg';
        $config['overwrite'] = 'TRUE';

        $this->load->library('upload', $config);

        if ( ! $this->upload->do_upload()) {
            $error = array('error' => $this->upload->display_errors());

            $error['propertyDropdown'] = $_SESSION['propertyDropdown'];
            $error['username'] = $_SESSION['username'];
            $error['dbPropNumber'] = $_SESSION['dbPropNumber'];
            $error['propertyName'] = $this->content->getPropertyName($_SESSION['dbPropNumber']);

            $this->load->view('upload_AmenityImage', $error);
        } else {
            $image_data = $this->upload->data();

            $origWidth = $image_data['image_width'];
            $origHeight = $image_data['image_height'];
            $newWidth = 615;
            $newHeight = $newWidth*$origHeight/$origWidth;

            $resize = array(
                'image_library'=>'gd2',
                'source_image'=>base_url().'uploads/'.$_SESSION['dbPropNumber'].'/'.$imageName.'.jpg',
                'new_image'=>base_url().'uploads/'.$_SESSION['dbPropNumber'].'/'.$imageName.'1.jpg',
                'create_thumb' => FALSE,
                'maintain_ratio'=>FALSE,
                'width'=>$newWidth,
                'height'=>$newHeight
            );

            $this->load->library('image_lib',$resize);
            $this->image_lib->resize();

            $data = array('upload_data' => $this->upload->data());
            $data['propertyDropdown'] = $_SESSION['propertyDropdown'];
            $data['username'] = $_SESSION['username'];
            $data['dbPropNumber'] = $_SESSION['dbPropNumber'];
            $data['propertyName'] = $this->content->getPropertyName($_SESSION['dbPropNumber']);

            //Present jCrop option after image is resized

            // FTP to final destination

            $this->load->view('upload_success', $data);
        } // end if
    } // end function

Answer 1

我不完全确定你的代码出了什么问题,但这里有一个模型函数我写的用于调整图像大小以适应精确的目标高度和目标宽度.仔细阅读它,看看你是否能找出解决方案.

$this->prefix我使用的是我班级中的一个属性,所以我不必一直写出文件的目录.它看起来像这样:

$this->prefix = FCPATH.'uploads'.DIRECTORY_SEPARATOR;

图像缩放器

/**
 * Resizes an image to fit exact dimensions
 * 
 * @param string    filename
 * @param int      target_width
 * @param int      target_height
 * 
 * @return array('success' ? null : 'error')
 */
function resizeImageToDimensions($filename, $target_width=700, $target_height=399)
{
    $file_type = $this->getFileType($this->prefix.$filename);

    if (!$file_type || $file_type != 'image')
        return array('success'=>false, 'error'=>"This file doesn't exist or isn't an image");

    $this->load->library('image_lib');

    list($width, $height) = getimagesize($this->prefix.$filename);
    $current_ratio = $width/$height;
    $target_ratio = $target_width/$target_height;
    $config['source_image'] = $this->prefix.$filename;

    if ($current_ratio > $target_ratio)
    {
        //resize first to height, maintain ratio
        $config['height'] = $target_height;
        $config['width'] = $target_height * $current_ratio;
        $this->image_lib->initialize($config);

        if (!$this->image_lib->resize())
            return array('success'=>false, 'error'=>"There was an error while resizing this image");

        //then crop off width
        $config['width'] = $target_width;
        $config['maintain_ratio'] = false;
        $this->image_lib->initialize($config);

        if ($this->image_lib->crop())
            return array('success'=>true);
        else
            return array('success'=>false, 'error'=>"There was an error while cropping this image");
    }
    else if ($current_ratio < $target_ratio)
    {
        //resize first to width, maintain ratio
        $config['width'] = $target_width;
        $config['height'] = $target_width / $current_ratio;
        $this->image_lib->initialize($config);

        if (!$this->image_lib->resize())
            return array('success'=>false, 'error'=>"There was an error while resizing this image");

        //then crop off height
        $config['height'] = $target_height;
        $config['maintain_ratio'] = false;
        $this->image_lib->initialize($config);

        if ($this->image_lib->crop())
            return array('success'=>true);
        else
            return array('success'=>false, 'error'=>"There was an error while cropping this image");
    }
    else {
        $config['width'] = $target_width;
        $config['height'] = $target_height;
        $this->image_lib->initialize($config);

        if ($this->image_lib->resize())
            return array('success'=>true);
        else
            return array('success'=>false, 'error'=>"There was an error while resizing this image");
    }
}