Determine Image Upload, js determine the size of the uploaded Image

Determine Image Upload, js determine the size of the uploaded Image

It is not only the extension to be determined, but also the extension to be modified.

1 private bool IsImage (string filePath) 2 {3 Image image; 4 try 5 {6 image = Image. fromFile (filePath); 7 image. dispose (); 8 return true; 9} 10 catch (Exception ex) 11 {12 return false; 13} 14}View Code

Determine the file header

/// <Summary> /// determine the type of the uploaded file based on the file header /// </summary> /// <param name = "filePath"> filePath is the complete path of the file </param> // <returns> returns true or false </returns> private bool IsPicture (string filePath) {try {FileStream fs = new FileStream (filePath, FileMode. open, FileAccess. read); BinaryReader reader = new BinaryReader (fs); string fileClass; byte buffer; buffer = reader. readByte (); fileClass = buffer. toString (); buffer = reader. readByte (); fileClass + = buffer. toString (); reader. close (); fs. close (); if (fileClass = "255216" | fileClass = "7173" | fileClass = "13780" | fileClass = "6677 ") // 255216 is jpg; 7173 is gif; 6677 is BMP; 13780 is PNG; 7790 is exe; 8297 is rar {return true;} else {return false ;}} catch {return false ;}}View Code