flash alchemy:传递浮点数组

时间:2012-08-21 14:32:13

标签: adobe swc alchemy

不起作用:

             var b:ByteArray = new ByteArray();
             b.writeFloat(-50.000000);
             b.position = 0;


             cpp.processFloat(b,b.bytesAvailable);

CPP:

static AS3_Val processFloat(void* self, AS3_Val args){
unsigned iTestSize;
AS3_Val sOrigFile = AS3_Undefined();

AS3_ArrayValue( args, "AS3ValType, IntType", &sOrigFile, &iTestSize );

float * sFile = (float *)malloc(sizeof(float) * (iTestSize + 1));

int res = AS3_ByteArray_readBytes(sFile, sOrigFile, iTestSize);

fprintf( stderr, "** processFloat() size: %i sFile: %.03f, res:%i\n", iTestSize, sFile, res );

fprintf ouput: ** processFloat size:4 sFile:0.000,res:4

怎么了?如何从闪存中将浮点数组传递给swc?

1 个答案:

答案 0 :(得分:0)

您的问题是字节顺序(更多详情here)。您需要将ByteArray设置为Little Endian:

var b:ByteArray = new ByteArray();
b.endian= Endian.LITTLE_ENDIAN;
b.writeFloat(-50.000000);
b.position = 0;

cpp.processFloat(b,b.bytesAvailable);

此外,您的iTestSize感到困惑。您传入bytesAvailable但是然后将其乘以sizeof(float)(并添加1 ??)。