How to view base64 images in the mini program? The following article will introduce to you how to preview base64 images in the WeChat applet. I hope it will be helpful to you!
1. The image passed from the background is in base64 format. To display it, use ["data:image/PNG;base64," data]. can be displayed normally. Then when calling the WeChat API interface previewImage, there are many problems, such as:
- windows development tools black screen
- Some Android models cannot display
- Console error, etc.
2. After inquiry, I found the official answer. WeChat official means that you need to use the url address and the base64 format is not supported. The following is WeChat’s official answer:
wx.previewImage API Previewing base64 images causes WeChat to crash? | WeChat Open Community (qq.com )
https://developers.weixin.qq.com/community/develop/doc/00088c9e44c3d880597ab22b15bc00?highLine=wx.previewImage base64
Solution
Idea: First save base64 as a temporary file locally, then preview it, delete the temporary file at the end of the preview
// 獲取應用實例
const app = getApp()
Page({
data: {
//base64數(shù)據(jù)，由后臺傳過來
base64: '',
//本機的臨時文件路徑
localImgUrl: ''
},
onShow: function() {
// 在這里刪除臨時文件
var localImgUrl = this.data.localImgUrl;
if(localImgUrl) {
var fs = wx.getFileSystemManager();
fs.unlinkSync(localImgUrl);
fs.closeSync();
}
},
//預覽圖片
onPreviewImage() {
var base64 = "data:image/PNG;base64," + this.data.base64;
var imgPath = wx.env.USER_DATA_PATH + '/e-invoice' + Date.parse(new Date()) + '.png';
var imageData = base64.replace(/^data:image\/\w+;base64,/, "");
var fs = wx.getFileSystemManager();
fs.writeFileSync(imgPath, imageData, "base64");
fs.close();
this.setData({
localImgUrl: imgPath
})
wx.previewImage({
urls: [imgPath] // 需要預覽的圖片http鏈接列表
})
}
})[Related learning recommendations:小programDevelopmentTutorial】
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