HttpResponse.WriteFile Method (IntPtr, Int64, Int64)
.NET Framework 3.0
Writes the specified file directly to an HTTP response output stream.
Namespace: System.Web
Assembly: System.Web (in system.web.dll)
Assembly: System.Web (in system.web.dll)
public void WriteFile ( IntPtr fileHandle, long offset, long size )
public function WriteFile ( fileHandle : IntPtr, offset : long, size : long )
Not applicable.
Parameters
- fileHandle
The file handle of the file to write to the HTTP output stream.
- offset
The byte position in the file where writing will start.
- size
The number of bytes to write to the output stream.
When this method is used with large files, calling the method might result in an exception. The size of the file that can be used with this method depends on the hardware configuration of the Web server. For more information, see article 812406, "PRB: Response.WriteFile Cannot Download a Large File" in the Microsoft Knowledge Base.
The following example writes the entire contents of a text file named "login.txt" (which might contain literal HTML text and input controls) directly to the output stream.
String fileName;
FileStream myFileStream;
IntPtr fileHandle;
long startPos = 0;
long fileSize;
fileName = "c:\\temp\\Login.txt";
myFileStream = new FileStream(fileName, FileMode.Open);
fileHandle = myFileStream.get_Handle();
fileSize = myFileStream.get_Length();
get_Response().Write("<b>Login: </b>");
get_Response().Write("<input type=text id=user /> ");
get_Response().Write("<input type=submit value=Submit /><br><br>");
get_Response().WriteFile(fileHandle, startPos, fileSize);
myFileStream.Close();
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