Convert Hexadecimal string to image
Question
A client of ours uses a java code to render the image from an hexadecimal string stored as varchar in database. We want to create a similar code in php to render that same image but are unable to do so. Following is the java code sample which the client is using.
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
<?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
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2 answers
solution1
1 2014-11-26 07:42:16
following should work
<BODY>
<?php
$image = $row["img"];
echo '<img src="data:image/jpg;base64,'.base64_encode(hex2bin($image)).'"/>';
?>
</BODY>
edit explanation how it works
- first get the image as hex string from the database
- convert the hex string into binary
- encode the binary as BASE64 string
solution2
1 ACCPTED 2015-02-13 09:26:16
below code can be use to extract image from hex string value
<?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">
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