# 数据类型转换说明

在开发AR应用时，部分数据类型需要转换才能使用，以下进行汇总及示例。

## ArrayBuffer

在一些不支持接收ArrayBuffer数据类型的方法中，需要将其反序列化为int32或者float32类型，涉及转换的接口列表如下：

|接口名|描述|
|:------------------------------------------------------------------------------------------------------------------------------------------------------|:------------------------------------|
|[ImageComponent](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/arengine-api-arengine#imagecomponent)|参数buffer为ArrayBuffer类型，可转换为int32。|
|[ARPlane.getPolygonXZ](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/arengine-api-arengine#arplanegetpolygonxz)|返回值为ArrayBuffer类型，可转换为float32。|
|[ARSceneMesh.getVertices](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/arengine-api-arengine#arscenemeshgetvertices)|返回值为ArrayBuffer类型，可转换为float32。|
|[ARSceneMesh.getVertexNormals](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/arengine-api-arengine#arscenemeshgetvertexnormals)|返回值为ArrayBuffer类型，可转换为float32。|
|[ARSceneMesh.getTriangleIndices](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/arengine-api-arengine#arscenemeshgettriangleindices)|返回值为ArrayBuffer类型，可转换为int32。|
|[ARSemanticDensePointData](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/arengine-api-arengine#arsemanticdensepointdata)|参数id为ArrayBuffer类型，可转换为int32。|
|[ARSemanticDensePointData](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/arengine-api-arengine#arsemanticdensepointdata)|参数position为ArrayBuffer类型，可转换为float32。|
|[ARSemanticDensePointData](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/arengine-api-arengine#arsemanticdensepointdata)|参数color为ArrayBuffer类型，可转换为int32。|

转换的示例如下：

```TypeScript
export function arrayBufferFloat32ToNumber(buffer: ArrayBuffer): number[] {
  let view: Float32Array = new Float32Array(buffer);
  let numberArray: number[] = Array.from(view);
  return numberArray;
}

export function arrayBufferInt32ToNumber(buffer: ArrayBuffer): number[] {
  let view: Int32Array = new Int32Array(buffer);
  let numberArray: number[] = Array.from(view);
  return numberArray;
}
```