delphi 怎样将二进制字符串转化为图片文件
将一个图片转换成二进制编码，再将一个二进制字符串转换成为图片实例：
Java代码
public class Test{
public static void main(String[] args) {
try{
// 将图片转换成字符串
File f = new File("c:\\biao.png");
FileInputStream fis = new FileInputStream( f );
byte[] bytes = new byte[fis.available()];
fis.read(bytes);
fis.close();
// 生成字符串
String imgStr = byte2hex( bytes );
System.out.println( imgStr);
// 将字符串转换成二进制，用于显示图片
// 将上面生成的图片格式字符串 imgStr，还原成图片显示
OutputStream o = new FileOutputStream("c:\\878789.png");
byte[] imgByte = hex2byte( imgStr );
InputStream in = new ByteArrayInputStream( imgByte );
byte[] b = new byte[1024];
int nRead = 0;
while( ( nRead = in.read(b) ) != -1 ){
o.write( b, 0, nRead );
}
o.flush();
o.close();
in.close();
}catch(Exception e){
e.printStackTrace();
}finally{
}
}
/**
* 二进制转字符串
* @param b byte数组
* @return 二进制字符串
*/
public static String byte2hex(byte[] b){
StringBuffer sb = new StringBuffer();
String stmp = "";
for (int n = 0; n < b.length; n++) {
stmp = Integer.toHexString(b[n] & 0XFF);
if (stmp.length() == 1) {
sb.append("0" + stmp);
} else {
sb.append(stmp);
}
}
return sb.toString();
}
/**
* 字符串转二进制
* @param str 字符串
* @return byte数组
*/
public static byte[] hex2byte(String str) {
if (str == null)
return null;
str = str.trim();
int len = str.length();
if (len == 0 || len % 2 == 1)
return null;
byte[] b = new byte[len / 2];
try {
for (int i = 0; i < str.length(); i += 2) {
b[i / 2] = (byte) Integer.decode("0X" + str.substring(i, i + 2)).intValue();
}
return b;
} catch (Exception e) {
return null;
}
}
}
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