HttpResponse::WriteFile Method (IntPtr, Int64, Int64)

.NET Framework (current version)

Writes the specified file directly to an HTTP response output stream.

Namespace: System.Web
Assembly: System.Web (in System.Web.dll)

Syntax

public:
[SecurityPermissionAttribute(SecurityAction::Demand, UnmanagedCode = true)]
void WriteFile(
	IntPtr fileHandle,
	long long offset,
	long long size
)

Parameters

fileHandle: Type: System::IntPtr
The file handle of the file to write to the HTTP output stream.

offset: Type: System::Int64
The byte position in the file where writing will start.

size: Type: System::Int64
The number of bytes to write to the output stream.

Exceptions

Exception	Condition
ArgumentNullException	fileHandler is null.
HttpException	offset is less than 0. - or - size is greater than the file size minus offset.

When this method is used with large files, calling the method might throw 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" on the Microsoft Knowledge Base Web site.

Examples

The following example writes all the contents of a text file named Login.txt (which might contain literal HTML text and input controls) directly to the output stream.

C++

No code example is currently available or this language may not be supported.

Version Information

.NET Framework
Available since 1.1