我不断收到这个错误，这让我发疯。这是我第一次尝试将 a 导出Flash MovieClip到可下载的*.PNG文件中。我按照在线指南并实施了 Adobe 的PNGEncoder.as“图像”。
指南：http ://permadi.com/blog/2011/02/flash-as3-saving-image-to-disk/ PNGEncoder：https ://github.com/mikechambers/as3corelib/tree/master/src/com/土坯/图像/
我设置了PNGEncoder.as课程并更改了偏好，以便Flash识别它（已确认）。现在，当我运行SWF并单击按钮时，它什么也不做，输出说TypeError: Error #1006: encode is not a function.
import flash.display.MovieClip;
import flash.display.Bitmap;
import customClasses.PNGEncoder;
import flash.net.FileReference;
import flash.utils.ByteArray;
stop();
/*
CAMERA button command
Opens download command window to save instance of theBike as .PNG
*/
CAMERA.addEventListener(MouseEvent.CLICK, fl_ClickToGoToAndStopAtFrame_20);
function fl_ClickToGoToAndStopAtFrame_20(event:MouseEvent):void
{
// source for the bitmap data in this case is a text field
var tf:MovieClip = Object(root).bike;
// create new transparent BitmapData object to hold the captured data
// BitmapData(width, height, transparent, color)
var myBitmapData:BitmapData = new BitmapData(640, 406, true, 0x000000);
// draw the source data into the BitmapData object
myBitmapData.draw(tf);
// make a new Bitmap object and populate with the BitmapData object
var bmp:Bitmap = new Bitmap(myBitmapData);
var myPNG:PNGEncoder = new PNGEncoder();
var byteArray:ByteArray = myPNG.encode(myBitmapData); <-- PROBLEM HERE
var fileReference:FileReference=new FileReference();
fileReference.save(byteArray, "bike.png");
}
来自 PNGEncoder.as：
package customClasses
{
import flash.geom.*;
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.utils.ByteArray;
/**
* Class that converts BitmapData into a valid PNG
*/
public class PNGEncoder
{
/**
* Created a PNG image from the specified BitmapData
*
* @param image The BitmapData that will be converted into the PNG format.
* @return a ByteArray representing the PNG encoded image data.
*/
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;
var j:int;
if ( !img.transparent ) {
for(j=0;j < img.width;j++) {
p = img.getPixel(j,i);
IDAT.writeUnsignedInt(
uint(((p&0xFFFFFF) << 8)|0xFF));
}
} else {
for(j=0;j < img.width;j++) {
p = img.getPixel32(j,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):void {
if (!crcTableComputed) {
crcTableComputed = true;
crcTable = [];
var c:uint;
for (var n:uint = 0; n < 256; n++) {
c = n;
for (var k:uint = 0; k < 8; k++) {
if (c & 1) {
c = uint(uint(0xedb88320) ^
uint(c >>> 1));
} else {
c = uint(c >>> 1);
}
}
crcTable[n] = c;
}
}
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;
c = 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);
}
}
}
我在这里搜索了论坛，发现了类似的问题，但我还没有弄清楚如何解决这个问题。如果您有任何想法，请帮助！