将base64转换为pdf

时间:2016-09-09 15:20:34

标签: asp.net vb.net

我正在尝试将base64字符串转换为我的Web服务中的pdf但由于某种原因它无法正常工作,我的网络服务器返回错误的请求。最后4行引起了这个问题。

我已经跟随了一堆例子并且到目前为止

Dim base64file As String = "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"
            Dim bytes As Byte() = Convert.FromBase64String(base64file)

            Dim stream As New FileStream("c:\Users\me\Desktop\itworks.pdf", FileMode.CreateNew)
            stream.Write(bytes, 0, bytes.Length)
            stream.Close()
            opResult.success = True

我做错了什么?

1 个答案:

答案 0 :(得分:0)

正如其他人提到的那样,你应该在代码中添加日志以找出错误。

这有一些不错的建议: Where does Console.WriteLine go in ASP.NET?

否则,您可以在错误的代码周围添加try-catch,然后将异常打印到日志中。

我假设日志会在浏览器中显示,就像JS中的console.log一样。

如果您运行chrome,只需启动开发人员工具,并在您设置代码时找到您的控制台。这样,您可能会获得有关错误的更多信息。

此msdn URL包含有关try-catches的一些信息: https://msdn.microsoft.com/en-us/library/f9shkfdd.aspx

但基本上这个想法是你应该使用类似的东西:

Try
'Paste the code you are trying
Catch ex As Exception
'Add the log of your choice. In JS it would be Console.log(ex.message)
End Try
相关问题