// Copyright (c) Microsoft. All rights reserved.

//

// MainPage.xaml.cpp

// Implementation of the MainPage class.

//

#include "pch.h"

#include "MainPage.xaml.h"

using namespace DeviceIoControlUwp;

using namespace Platform;

using namespace Windows::Foundation;

using namespace Windows::Foundation::Collections;

using namespace Windows::UI::Xaml;

using namespace Windows::UI::Xaml::Controls;

using namespace Windows::UI::Xaml::Controls::Primitives;

using namespace Windows::UI::Xaml::Data;

using namespace Windows::UI::Xaml::Input;

using namespace Windows::UI::Xaml::Media;

using namespace Windows::UI::Xaml::Navigation;

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409

void AccessComPort ()

{

using namespace Microsoft::WRL::Wrappers;

// Open the COM port synchronously for simplicity.

// You'll almost always want to use FILE_FLAG_OVERLAPPED

// for COM ports.

FileHandle fileHandle(CreateFile(

L"\\\\.\\COM1",

GENERIC_READ | GENERIC_WRITE,

0,

nullptr,

OPEN_EXISTING,

FILE_ATTRIBUTE_NORMAL,

nullptr));

if (!fileHandle.IsValid()) {

DWORD lastError = GetLastError();

throw ref new Exception( // set a breakpoint here

HRESULT_FROM_WIN32(lastError),

L"Failed to open COM port.");

}

// Set baud rate

SERIAL_BAUD_RATE inputBuffer = { 115200 };

DWORD information;

if (!DeviceIoControl(

fileHandle.Get(),

IOCTL_SERIAL_SET_BAUD_RATE,

&inputBuffer,

sizeof(inputBuffer),

nullptr,

0,

&information,

nullptr)) {

throw ref new Exception(

HRESULT_FROM_WIN32(GetLastError()),

L"Failed to set baud rate.");

}

// Write out a string over the serial port

const char message[] = "Hello serial!\n";

if (!WriteFile(

fileHandle.Get(),

message,

sizeof(message),

&information,

nullptr)) {

throw ref new Exception(

HRESULT_FROM_WIN32(GetLastError()),

L"Failed to write data to COM port.");

}

}

MainPage::MainPage()

{

InitializeComponent();

AccessComPort();

}