将十六进制字符串转换为图像

Question

A client of ours uses a java code to render the image from an hexadecimal string stored as varchar in database. 我们的客户使用Java代码从存储为varchar的十六进制字符串中渲染图像。 We want to create a similar code in php to render that same image but are unable to do so. 我们想要在php中创建类似的代码来渲染相同的图像，但无法这样做。 Following is the java code sample which the client is using. 以下是客户端使用的Java代码示例。

 variable "photo" is hexadecimal String fetched from database. Further code is convert it into image format
try {
   String photoStr = (String)request.getSession(false).getAttribute("photo");
        byte photo[] =null;
        if(photoStr == null){
            photoStr ="0123456789abcdef";
        }
        photo = new byte[photoStr.length()/2+1];
        int i;
        String str1 = "" ;
        int cnt = 0;
            for(i=0;i<photoStr.length();i=i+2)
            {
                    if(i+1<photoStr.length())
                    str1 = photoStr.substring(i,i+2).trim();
                    else
                    str1 = photoStr.substring(i);
                    Integer val = new Integer(Integer.parseInt(str1,16));
                    photo[cnt] = val.byteValue();
                    cnt++;
            }
        BufferedImage bufferedImage = new BufferedImage (165, 165, BufferedImage.TYPE_INT_RGB);
        ImageIO.setUseCache( false );
        bufferedImage = ImageIO.read (new ByteArrayInputStream(photo));
        ImageIO.write(bufferedImage, "JPEG", outb);
} catch (IOException e) {
        e.printStackTrace();
  }catch (IllegalArgumentException e) {
     try{
        String fontName = "Arial";
        final int fontSize = 16;
        AffineTransform at = new AffineTransform();
        final Font basicFont = new Font(fontName, Font.PLAIN, fontSize);
        final Font font = new Font(fontName, Font.PLAIN, fontSize).deriveFont(at);
        BufferedImage bufferedImage = new BufferedImage(165, 165, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = (Graphics2D) bufferedImage.getGraphics();
        g2d.setBackground(Color.WHITE);
        g2d.clearRect(0, 0, 165, 165); 
        g2d.setColor(Color.RED);
        g2d.setFont(basicFont);
        final FontMetrics fm = g2d.getFontMetrics();
        g2d.setFont(font);
        g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        Rectangle2D rect = fm.getStringBounds("\n\n\n     Photo is not available           \n\n\n", g2d);
        int drop = fm.getDescent();
        int width = Math.min(165,(int) rect.getWidth() + 2 * 2);
        int height = Math.min(165, (int) rect.getHeight() + 2 *100);
        g2d.drawString("\n\n\n         Photo is not available           \n\n\n", drop+1, 125);
        BufferedImage croppedImage = bufferedImage.getSubimage(0, 0, height, width);
        g2d.dispose();
        ImageIO.setUseCache( false );
        ImageIO.write(croppedImage,"JPEG", outb);   
    }catch (IOException e1) {
        e1.printStackTrace();
    }
 }finally{
 out.close();
 }
=

Following is the php code we are using to render the image 以下是我们用来渲染图像的php代码

<?php
    $conn = mysql_connect("localhost", "root", "");
    mysql_select_db("image");
    $sql = "SELECT * FROM tbl_image where tbl_img_id = '14' "; 
    $result = mysql_query($sql);
?>
<HTML>
<HEAD>
<TITLE>List BLOB Images</TITLE>
<link href="imageStyles.css" rel="stylesheet" type="text/css" />
</HEAD>
<BODY>
<?php
    while($row = mysql_fetch_array($result)) {

        echo $image = base64_encode($row["img"]);
        echo '<img src="data:image/jpg;base64,'.base64_encode($row["img"]).'"/>';
    ?>
        <!--<img src="imageView.php?image_id=<?php //echo $row["img"]; ?>" /><br/>-->


<?php       
    }
    mysql_close($conn);
?>
</BODY>
</HTML>

And following is the Hex string stored in the database 接下来是存储在数据库中的十六进制字符串

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Answer 1

following should work 以下应该工作

<BODY>
    <?php
        $image = $row["img"];
        echo '<img src="data:image/jpg;base64,'.base64_encode(hex2bin($image)).'"/>';
    ?>
</BODY>

edit explanation how it works 编辑说明如何运作

first get the image as hex string from the database 首先从数据库中获取图像作为十六进制字符串
convert the hex string into binary 将十六进制字符串转换为二进制
encode the binary as BASE64 string 将二进制编码为BASE64字符串

Answer 2

below code can be use to extract image from hex string value 以下代码可用于从十六进制字符串值提取图像

<?php 
    $binary_string2=pack("H*",$hex_string2)
    ?>
     <img  src="data:image/jpeg;base64,<?php  echo base64_encode($binary_string);?>" alt="IMG DESC" >
     <img  src="data:image/jpeg;base64,<?php  echo base64_encode($binary_string2);?>" alt="IMG DESC">

将十六进制字符串转换为图像

问题描述

2 个解决方案

解决方案1
1 2014-11-26 07:42:16

解决方案2
1 已采纳 2015-02-13 09:26:16

将十六进制字符串转换为图像

问题描述

2 个解决方案

解决方案1 1 2014-11-26 07:42:16

解决方案2 1 已采纳 2015-02-13 09:26:16

解决方案1
1 2014-11-26 07:42:16

解决方案2
1 已采纳 2015-02-13 09:26:16