uniapp编写微信小程序调用百度OCR
公司有一个识别行驶证需求，调用百度ocr识别
使用了image-tools这个插件，因为百度ocr接口用图片的base64

这里只是简单演示，accesstoken获取接口还是要放在服务器端，不然就暴露了自己的百度项目key

代码我使用了这个博主的代码
https://blog.csdn.net/sjt1010/article/details/108272945

还有需要将百度接口的地址加到微信公众平台，开发管理的服务器域名里

<template>
	<view class="cheliangjinchudengji-index">
		<view>
			<button type="primary" @click="chooseImg">行驶证拍照识别</button>
			<view style="margin-left:10px ;" v-if="imgList.length > 0">
				<view v-for="(item,index) in imgList" :key="index">
					<image :src="item" mode=""></image>
				</view>
			</view>
			
			<!-- <button type="primary" @click="getBaiduToken">token</button> -->
			
			<view v-for="item of cardatas" :key="item">
				<view>{{item}}</view>
			</view>
			
		</view>
			
	</view>
</template>

<script>
	import { pathToBase64, base64ToPath } from '../../js_sdk/mmmm-image-tools/index.js'
	import { fetchBaiduOCRDatas  } from '../../utils/basePath';
	export default {
		data() {
			return {
				  imgList: [],
				  token:'',
				  cardatas:{
					  chepai:'',
					  xinghao:''
				  }
			}
		},
		methods: {
			chooseImg(){
				let that = this;
				that.getBaiduToken();
				uni.chooseImage({
					success: (chooseImageRes) => {
						const tempFilePaths = chooseImageRes.tempFilePaths;
						// #ifdef MP-WEIXIN
						uni.getFileSystemManager().readFile({
							filePath: tempFilePaths[0],
							encoding: 'base64',
							success: r => { 
								console.log(r.data)
								let base64 = 'data:image/jpeg;base64,'  + r.data;
								that.imgList.push(base64)
								
								that.postBaiduOcr(base64);
							}
						})
						// #endif
						// // #ifdef APP-PLUS
						// pathToBase64(tempFilePaths[0])
						//   .then(base64 => {
						// 	that.imgList.push(base64)
						//   })
						//   .catch(error => {
						// 	console.error(error)
						//   })
						// // #endif
					}
				});
			},
			postBaiduOcr(imgbase64){
				let that = this;
				
				let accessToken = that.token;
				fetchBaiduOCRDatas(
				"https://aip.baidubce.com/rest/2.0/ocr/v1/vehicle_license?access_token="+accessToken, 
				{"image":imgbase64} , 
				{'content-type': 'application/x-www-form-urlencoded'}, 
				"POST", 
				res=>{
					if(res.statusCode=='200' || res.statusCode==200){
						uni.showToast({
							type: 'success',
						    title: 'OCR成功！',
						    icon: 'none',
							duration:3000
						});
						that.cardatas.chepai = res.data.words_result.号牌号码.words;
						that.cardatas.xinghao = res.data.words_result.品牌型号.words;
					}else{
						uni.showToast({
							type: 'error',
						    title:  res.data.error_description,
						    icon: 'none',
							duration:3000
						});
					}
					
				})
			},
			getBaiduToken(){
				fetchBaiduOCRDatas(
				"https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id=xxxx&client_secret=xxxx", 
				{}, 
				{'Content-Type': 'application/json', 'Accept': 'application/json'}, 
				"POST", 
				res=>{
					if(res.statusCode=='200' || res.statusCode==200){
						uni.showToast({
							type: 'success',
						    title: 'token获取成功！',
						    icon: 'none',
							duration:3000
						});
					this.token = res.data.access_token	
					}else{
						uni.showToast({
							type: 'error',
						    title: res.data.error_description,
						    icon: 'none',
							duration:3000
						});
					}
					
				})
			},
			
		}
	}
</script>

<style>

</style>

const fetchBaiduOCRDatas = (url, data, header, method, callback, errCallback)=>{
  // let token = uni.getStorageSync('token');
  uni.request({
    url: url,
    data: data,
    method:method,
    header: header,
	// {
 //      'content-type': 'application/x-www-form-urlencoded'
 //    },
    success (res) {
      uni.hideLoading();
      callback(res);
    }
  })
}

这个行驶证图片是百度开发平台提供的图片