如何将字节数组转换回文件并使用C＃自动打开？

I am writing some code to add file attachments into an application I am building.

我正在编写一些代码来将文件附件添加到我正在构建的应用程序中。

I have add & Remove working but I don't know where to start to implement open.

我有添加和删除工作,但我不知道从哪里开始实现打开。

I have an array of bytes (from a table field) and I don't know how to make it automatically open e.g.

我有一个字节数组(来自表字段),我不知道如何让它自动打开,例如

If I have an array of bytes which is a PDF, how do I get my app to automatically open Acrobat or whatever the currently assigned application for the extension is using C#?

如果我有一个PDF格式的字节数组,如何让我的应用程序自动打开Acrobat或当前分配的扩展程序使用C#的任何应用程序?

4 个解决方案

#1

In order to open it in any external application, you'll need to write the bytes to disk, then use Process.Start to launch the associated application on the temporary file. Just pass the temporary filename (with the appropriate extension) as the only argument the Process.Start, and it will open that file in the appropriate application.

要在任何外部应用程序中打开它,您需要将字节写入磁盘,然后使用Process.Start在临时文件上启动关联的应用程序。只需传递临时文件名(带有相应的扩展名)作为Process.Start的唯一参数,它将在相应的应用程序中打开该文件。

Some applications may have a way to feed a stream of bytes, but this would need to be handled by the target application explicitly.

某些应用程序可能有一种方法来提供字节流,但这需要由目标应用程序显式处理。

For sample code, you could do something like:

对于示例代码,您可以执行以下操作:

byte[] filedata = GetMyByteArray();
string extension = GetTheExtension(); // "pdf", etc

string filename =System.IO.Path.GetTempFileName() + "." + extension; // Makes something like "C:\Temp\blah.tmp.pdf"

File.WriteAllBytes(filename, filedata);

var process = Process.Start(filename);
// Clean up our temporary file...
process.Exited += (s,e) => System.IO.File.Delete(filename);

#2

This may help a bit

这可能会有所帮助

        byte[] bytes = File.ReadAllBytes(@"C:\temp\file.pdf");

        string outpath = @"c:\temp\openme.pdf";
        File.WriteAllBytes(outpath, bytes);
        Process.Start(outpath);

Simply writes the byte[] to disk and then runs it with the associated application.

只需将byte []写入磁盘,然后使用关联的应用程序运行它。

#3

Write the data to a temporary file and open it using Process. This will use the standard programm configured for the filetype. (eg txt > notepad)

将数据写入临时文件并使用Process打开它。这将使用为文件类型配置的标准程序。 (例如txt>记事本)

        byte[] b = new byte[]{0x0};
        var fileName = "c:\\test.txt";
        System.IO.File.WriteAllBytes(fileName, b);
        System.Diagnostics.Process.Start(fileName);

#4

// get the PDF in byte form from the system
var bytes = GetFileBytes("Some identifier");
// get a valid temporary file name and change the extension to PDF
var tempFileName = Path.ChangeExtension(Path.GetTempFileName(), "PDF");
// write the bytes of the PDF to the temp file
File.WriteAllBytes(tempFileName, bytes);
// Ask the system to handle opening of this file
Process.Start(tempFileName);

#1