用as3实现图片数据保存
2008-11-18 23:14 宝宝合凤凰 阅读(2526) 评论(0) 收藏 举报用as3实现图片数据保存：
PNGEncoder.as
程序代码
package
{
import flash.geom.*;
import flash.display.*;
import flash.utils.*;
public class PNGEncoder
{
public static function encode(img:BitmapData):ByteArray {
// Create output byte array
var png:ByteArray = new ByteArray();
// Write PNG signature
png.writeUnsignedInt(0x89504e47);
png.writeUnsignedInt(0x0D0A1A0A);
// Build IHDR chunk
var IHDR:ByteArray = new ByteArray();
IHDR.writeInt(img.width);
IHDR.writeInt(img.height);
IHDR.writeUnsignedInt(0x08060000); // 32bit RGBA
IHDR.writeByte(0);
writeChunk(png,0x49484452,IHDR);
// Build IDAT chunk
var IDAT:ByteArray= new ByteArray();
for(var i:int=0;i < img.height;i++) {
// no filter
IDAT.writeByte(0);
var p:uint;
if ( !img.transparent ) {
for(var j:int=0;j < img.width;j++) {
p = img.getPixel(j,i);
IDAT.writeUnsignedInt(
uint(((p&0xFFFFFF) << 8)|0xFF));
}
} else {
for(var k:int=0;k < img.width;k++) {
p = img.getPixel32(k,i);
IDAT.writeUnsignedInt(
uint(((p&0xFFFFFF) << 8)|(p >>> 24)));
}
}
}
IDAT.compress();
writeChunk(png,0x49444154,IDAT);
// Build IEND chunk
writeChunk(png,0x49454E44,null);
// return PNG
return png;
}
private static var crcTable:Array;
private static var crcTableComputed:Boolean = false;
private static function writeChunk(png:ByteArray,
type:uint, data:ByteArray) {
if (!crcTableComputed) {
crcTableComputed = true;
crcTable = [];
for (var n:uint = 0; n < 256; n++) {
var c_1:uint = n;
for (var k:uint = 0; k < 8; k++) {
if (c_1 & 1) {
c_1 = uint(uint(0xedb88320) ^
uint(c_1 >>> 1));
} else {
c_1 = uint(c_1 >>> 1);
}
}
crcTable[n] = c_1;
}
}
var len:uint = 0;
if (data != null) {
len = data.length;
}
png.writeUnsignedInt(len);
var p:uint = png.position;
png.writeUnsignedInt(type);
if ( data != null ) {
png.writeBytes(data);
}
var e:uint = png.position;
png.position = p;
var c:uint = 0xffffffff;
for (var i:int = 0; i < (e-p); i++) {
c = uint(crcTable[
(c ^ png.readUnsignedByte()) &
uint(0xff)] ^ uint(c >>> 8));
}
c = uint(c^uint(0xffffffff));
png.position = e;
png.writeUnsignedInt(c);
}
}
}
swf的代码:
程序代码
var url:String = "savePic.asp";
var bpd:BitmapData = new BitmapData(a_mc.width, a_mc.height);
bpd.draw(a_mc);
var dat:ByteArray = PNGEncoder.encode(bpd);
var request:URLRequest = new URLRequest(url);
request.contentType = "application/octet-stream";
request.data = dat;
request.method = URLRequestMethod.POST;
var loader:URLLoader = new URLLoader();
loader.dataFormat=URLLoaderDataFormat.BINARY;
try {
loader.load(request);
} catch (error:ArgumentError) {
trace("An ArgumentError has occurred.");
} catch (error:SecurityError) {
trace("A SecurityError has occurred.");
}
asp代码:
程序代码
<%
dim strSaveFileName
dim strNow
strnow =replace(replace(replace(now(), ":", ""), "-", ""), " ", "")
if request.servervariables("REQUEST_METHOD")="POST" then '当前为post
FormSize=Request.TotalBytes
FormData=Request.BinaryRead(FormSize) '接收数据到FormData
strSaveFileName =strNow &".png"
set dr=CreateObject("Adodb.Stream")
dr.Mode=3
dr.Type=1
dr.Open
dr.Write(FormData)
dr.SaveToFile Server.MapPath(strSaveFileName),2
dr.Close
set dr=nothing
response.Write(strSaveFileName)
end if
%>
===========
这里还有jsp的代码:
程序代码
<%@ page contentType="text/html; charset=utf-8" language="java"%>
<%@ page import="java.util.*"%>
<%@ page import="java.io.*"%>
<%
int v;
String filePath = request.getRealPath(System.currentTimeMillis()+".jpg");
BufferedInputStream inputStream = new BufferedInputStream(request.getInputStream());
FileOutputStream outputStream = new FileOutputStream(new File(filePath));
byte [] bytes = new byte[1024];
while((v=inputStream.read(bytes))>0){
outputStream.write(bytes,0,v);
}
outputStream.close();
inputStream.close();
%>
php的代码:
程序代码
<?
$data = file_get_contents('php://input');
echo file_put_contents("2.png",$data);
?>
dot net 的代码:
程序代码
Stream pngFile = Request.InputStream;
int v;
string path = Server.MapPath("Test.png");
byte[] arrayByte = new byte[1024];
// Create the new, empty data file.
if (File.Exists(path))
{
Response.Write("already exists!");
return;
}
FileStream fs = new FileStream(path, FileMode.CreateNew);
while ((v = pngFile.Read(arrayByte, 0, 1024)) > 0)
{
fs.Write(arrayByte, 0, v);
}
fs.Close();
文件下载
实现png透明
只用在 new BitmapData()里加上最后一个参数赋值为0x00就可以了.
var bpd:BitmapData = new BitmapData(a_mc.width, a_mc.height,true,0x00);
var myBitmapData:BitmapData = new BitmapData(480, 360,true,0x00);
myBitmapData.draw(_base);
package
{
import flash.geom.*;
import flash.display.*;
import flash.utils.*;
public class PNGEncoder
{
public static function encode(img:BitmapData):ByteArray {
// Create output byte array
var png:ByteArray = new ByteArray();
// Write PNG signature
png.writeUnsignedInt(0x89504e47);
png.writeUnsignedInt(0x0D0A1A0A);
// Build IHDR chunk
var IHDR:ByteArray = new ByteArray();
IHDR.writeInt(img.width);
IHDR.writeInt(img.height);
IHDR.writeUnsignedInt(0x08060000); // 32bit RGBA
IHDR.writeByte(0);
writeChunk(png,0x49484452,IHDR);
// Build IDAT chunk
var IDAT:ByteArray= new ByteArray();
for(var i:int=0;i < img.height;i++) {
// no filter
IDAT.writeByte(0);
var p:uint;
if ( !img.transparent ) {
for(var j:int=0;j < img.width;j++) {
p = img.getPixel(j,i);
IDAT.writeUnsignedInt(
uint(((p&0xFFFFFF) << 8)|0xFF));
}
} else {
for(var k:int=0;k < img.width;k++) {
p = img.getPixel32(k,i);
IDAT.writeUnsignedInt(
uint(((p&0xFFFFFF) << 8)|(p >>> 24)));
}
}
}
IDAT.compress();
writeChunk(png,0x49444154,IDAT);
// Build IEND chunk
writeChunk(png,0x49454E44,null);
// return PNG
return png;
}
private static var crcTable:Array;
private static var crcTableComputed:Boolean = false;
private static function writeChunk(png:ByteArray,
type:uint, data:ByteArray) {
if (!crcTableComputed) {
crcTableComputed = true;
crcTable = [];
for (var n:uint = 0; n < 256; n++) {
var c_1:uint = n;
for (var k:uint = 0; k < 8; k++) {
if (c_1 & 1) {
c_1 = uint(uint(0xedb88320) ^
uint(c_1 >>> 1));
} else {
c_1 = uint(c_1 >>> 1);
}
}
crcTable[n] = c_1;
}
}
var len:uint = 0;
if (data != null) {
len = data.length;
}
png.writeUnsignedInt(len);
var p:uint = png.position;
png.writeUnsignedInt(type);
if ( data != null ) {
png.writeBytes(data);
}
var e:uint = png.position;
png.position = p;
var c:uint = 0xffffffff;
for (var i:int = 0; i < (e-p); i++) {
c = uint(crcTable[
(c ^ png.readUnsignedByte()) &
uint(0xff)] ^ uint(c >>> 8));
}
c = uint(c^uint(0xffffffff));
png.position = e;
png.writeUnsignedInt(c);
}
}
}
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