通过面向连接的套接字发送数据

在 Winsock 内核 (WSK) 应用程序将面向连接的套接字连接到远程传输地址后，它可以通过该套接字发送数据。 WSK 应用程序还可以通过它在侦听套接字上接受的面向连接的套接字发送数据。 WSK 应用程序通过调用 WskSend 函数通过面向连接的套接字发送数据。

下面的代码示例演示 WSK 应用程序如何通过面向连接的套接字发送数据。

// Prototype for the send IoCompletion routine
NTSTATUS
  SendComplete(
    PDEVICE_OBJECT DeviceObject,
    PIRP Irp,
    PVOID Context
    );

// Function to send data
NTSTATUS
  SendData(
    PWSK_SOCKET Socket,
    PWSK_BUF DataBuffer
    )
{
  PWSK_PROVIDER_CONNECTION_DISPATCH Dispatch;
  PIRP Irp;
  NTSTATUS Status;

  // Get pointer to the provider dispatch structure
  Dispatch =
    (PWSK_PROVIDER_CONNECTION_DISPATCH)(Socket->Dispatch);

  // Allocate an IRP
  Irp =
    IoAllocateIrp(
      1,
      FALSE
      );

  // Check result
  if (!Irp)
  {
    // Return error
    return STATUS_INSUFFICIENT_RESOURCES;
  }

  // Set the completion routine for the IRP
  IoSetCompletionRoutine(
    Irp,
    SendComplete,
    DataBuffer,  // Use the data buffer for the context
    TRUE,
    TRUE,
    TRUE
    );

  // Initiate the send operation on the socket
  Status =
    Dispatch->WskSend(
      Socket,
      DataBuffer,
      0,  // No flags
      Irp
      );

  // Return the status of the call to WskSend()
  return Status;
}

// Send IoCompletion routine
NTSTATUS
  SendComplete(
    PDEVICE_OBJECT DeviceObject,
    PIRP Irp,
    PVOID Context
    )
{
  UNREFERENCED_PARAMETER(DeviceObject);

  PWSK_BUF DataBuffer;
  ULONG ByteCount;

  // Check the result of the send operation
  if (Irp->IoStatus.Status == STATUS_SUCCESS)
  {
    // Get the pointer to the data buffer
    DataBuffer = (PWSK_BUF)Context;

    // Get the number of bytes sent
    ByteCount = (ULONG)(Irp->IoStatus.Information);

    // Re-use or free the data buffer
    ...
  }

  // Error status
  else
  {
    // Handle error
    ...
  }

  // Free the IRP
  IoFreeIrp(Irp);

  // Always return STATUS_MORE_PROCESSING_REQUIRED to
  // terminate the completion processing of the IRP.
  return STATUS_MORE_PROCESSING_REQUIRED;
}