C# Signature:

[DllImport("winhttp.dll", SetLastError=true)]
static extern bool WinHttpQueryDataAvailable(
            IntPtr hRequest,
            ref UInt32 lpdwNumberOfBytesAvailable
            );

VB Signature:

Declare Function WinHttpQueryDataAvailable Lib "winhttp.dll" (ByVal hRequest As IntPtr, ByRef lpdwNumberOfBytesAvailable As Integer) As Boolean
Declare Function WinHttpQueryDataAvailable Lib "winhttp.dll" (TODO) As TODO

User-Defined Types:

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

I tested this method in sync method, it is ok. But according to MSDN and C++ code, the second param should be NULL when use async method. This function cann't work.

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Sample Code:

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