PDA手持扫码枪(Android)使用uniapp进行拍照操作

利用plus.camera.getCamera()实现PDA中的uniapp拍照，并返回文件路径 

前提：

1. uni自带的拍照插件不支持app使用,因此不能使用常规调用摄像头方法
2. 需要实现PDA拍照
3. uniapp的app端用不了tesseract.js ，因为nodejs没有blob，放弃前端识别文本

plus.camera.getCamera( index );
指定要获取摄像头的索引值，1表示主摄像头，2表示辅摄像头。如果没有设置则使用系统默认主摄像头。

cmr.captureImage(successCB, errorCB, options);
successCB: ( CameraSuccessCallback ) 必选 拍照操作成功的回调函数
errorCB: ( CameraErrorCallback ) 可选 拍照操作失败的回调函数
options: ( CameraOptions ) 必选 摄像头拍照参数

输出camera对象

 //获取摄像头管理对象  var camera = plus.camera.getCamera();  console.log(camera)

camera对象输出:(分辨率等信息)

{
    "__busy__": false,
    "supportedImageResolutions": [
        "4160*3120",
        "4096*2304",
        "4096*2160",
        "4000*3000",
        "3840*2160",
        "3264*2448",
        "3200*2400",
        "2976*2976",
        "2688*1512",
        "2592*1944",
        "2592*1940",
        "2048*1536",
        "1920*1440",
        "1920*1080",
        "1600*1200",
        "1440*1080",
        "1280*960",
        "1280*768",
        "1280*720",
        "1080*1080",
        "1024*738",
        "1024*768",
        "864*480",
        "800*600",
        "800*480",
        "720*1280",
        "720*480",
        "640*480",
        "640*400",
        "640*360",
        "352*288",
        "320*240",
        "240*320",
        "224*1557",
        "224*2941",
        "224*865",
        "176*144"
    ],
    "supportedVideoResolutions": [
        "1920*1080",
        "1440*1080",
        "1280*960",
        "1280*768",
        "1280*720",
        "1080*1080",
        "1024*738",
        "1024*768",
        "864*480",
        "800*600",
        "800*480",
        "720*480",
        "640*480",
        "640*400",
        "640*360",
        "352*288",
        "320*240",
        "240*320",
        "224*865",
        "176*144"
    ],
    "supportedImageFormats": [
        "jpg"
    ],
    "supportedVideoFormats": [
        "mp4"
    ]
}

拍照方法：

// 拍照
function takePic() {
  console.log("拍照识别------------------------------")
  //获取摄像头管理对象
  var camera = plus.camera.getCamera();
  //分辨率
  var res = camera.supportedImageResolutions[0];
  //文件格式
  var fmt = camera.supportedImageFormats[0];
  //图片文件保存的路径
  var filename = "_doc/ocr_pic/";
  console.log(camera)
  camera.captureImage(
    (path) => {
      //获取图片信息（图片在PDA中的路径）
      plus.io.getImageInfo({
        src: path,
        success: function (res) {
          console.log("图片在PDA中的路径是：", res);
          ocrPath = res.path;
        },
        fail: function (err) {
          console.log("获取失败", err);
        }
      })
      console.log("拍照成功，图片路径是: " + path);
    },
    (error) => {
      console.log("拍照失败: " + error.message);
    },
    {
      resolution: res,
      format: fmt,
      filename: filename
    }
  );
}
 

输出结果：

拍照成功，图片路径是: _doc/ocr_pic/1740647043533.jpg 
图片在PDA中的路径是：,  [Object] {"path":"file:///storage/emulated/0/Android/data/io.dcloud.HBuilder/apps/HBuilder/doc/ocr_p...}
------
{
    "path": "file:///storage/emulated/0/Android/data/io.dcloud.HBuilder/apps/HBuilder/doc/ocr_pic/1740647043533.jpg",
    "width": 3120,
    "height": 4160,
    "orientation": "up",
    "type": "jpeg"
}