https://developers.weixin.qq.com/doc/oplatform/Mobile_App/Share_and_Favorites/ohos.htmlhttps://developers.weixin.qq.com/doc/oplatform/Mobile_App/Access_Guide/ohos.html

sdk版本：1.0.14

微信版本：1.0.6

手机信息：mate60

API版本：5.0.4（16）

OpenHarmony版本：OpenHarmony 5.0.1

代码如下（官方demo）：

let resourceManager = getContext().resourceManager
let imageArray = await resourceManager.getMediaContent($r('app.media.atest0'));

let pixelBuffer = imageArray.buffer as ArrayBuffer;
let imageResource = image.createImageSource(pixelBuffer);
let opts: image.DecodingOptions = { editable: true }

let pixelMap = await imageResource.createPixelMap(opts);

const imagePackerApi: image.ImagePacker = image.createImagePacker();
let packOpts: image.PackingOption = { format: 'image/jpeg', quality: 20 };
imagePackerApi.packing(pixelMap, packOpts).then(async (data: ArrayBuffer) => {
  let imageObject = new wxopensdk.WXImageObject

  let buf: buffer.Buffer = buffer.from(data);
  imageObject.imageData = buf.toString('base64', 0, buf.length);
  // imageObject.uri = await WXShareTool.getPictureUriFromAlbum()
  GFLog.d(TAG, "length = " + imageObject.imageData.length)

  let mediaMessage = new wxopensdk.WXMediaMessage()
  mediaMessage.mediaObject = imageObject

  let req = new wxopensdk.SendMessageToWXReq()
  req.scene = wxopensdk.SendMessageToWXReq.WXSceneSession
  req.message = mediaMessage

  WXApi.sendReq(getContext() as common.UIAbilityContext, req)
})