我正在编写扩展adobe air PNGEncoder的课程,
我想使用writeChunk方法,但它似乎是私有静态的,我似乎无法使用它与我的代码 但它给出了如下错误
错误: 描述资源路径位置类型 1061:通过带有静态类型com.adobe.images:PNGEncoder的引用调用可能未定义的方法writeChunk。 pngMethods.as / FOTO_WITH_AS3_1 / src / xmp第121行Flex问题
我的班级
public class pngMethods extends PNGEncoder
{
public function pngMethods()
{
super();
}
public function myMethod(pngOutput:ByteArray,IHDRByteArray:ByteArray):void
{
super.writeChunk(pngOutput,0x49484452,IHDRByteArray);
}
}
Adobe PNG METHOD
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);
答案 0 :(得分:1)
私人方法对外界是不可见的 - 即使继承也不行。