Golang的base64數據轉換成圖像上飛，並將響應

Question

我有一個示範基地64個數據，可以在IMG標籤中使用這樣的 -

<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEX/TQBcNTh/AAAACklEQVR4nGNiAAAABgADNjd8qAAAAABJRU5ErkJggg== 
"/> 

Demo

而且我擺弄周圍用一個小型的golang程序。 在golang中，我該如何將這個靜態基礎64位編碼數據快速轉換爲圖像，然後將其作爲圖像發送迴應。

防爆 -

http.HandleFunc("/getImage", imageHandler) 

func image(res http.ResponseWriter, req *http.Request) { 
    data := "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEX/TQBcNTh/AAAACklEQVR4nGNiAAAABgADNjd8qAAAAABJRU5ErkJggg==" 
    // Data is the base64 encoded image 
    dec := b64.NewDecoder(b64.StdEncoding, data) 
    res.Header().Set("Content-Type", "image/png") 
    io.Copy(res, dec) 
} 

Answer 1

在問題的代碼是接近。試試這個：

data := "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEX/TQBcNTh/AAAACklEQVR4nGNiAAAABgADNjd8qAAAAABJRU5ErkJggg==" 
// The actual image starts after the "," 
i := strings.Index(data, ",") 
if i < 0 { 
    log.Fatal("no comma") 
} 
// pass reader to NewDecoder 
dec := base64.NewDecoder(base64.StdEncoding, strings.NewReader(data[i+1:]))