Windows の COM Port を列挙する　(GUI版)

前回投稿のプログラムをGUI対応してみた。うん十年ぶりにWinAPIで実装してみたが久しぶり過ぎてなんだか新鮮な感じが。(笑)

COMデバイスが抜き差しされたときに最前面に表示されるようにしたこととどのポートが追加されたのかがわかるようにしてみた。あとはスタートアップにでも登録しておけばデバイスマネージャ見なくても接続したポートの情報がわかるので便利かも。ちなみにウインドウの位置やサイズは次回起動時に復元されるようになっている。

【初期状態】

【ポート接続】

【ポート切断】

【Dwonload (Eclipse+MinGW64 Project)】
comport.zip

【Update】
2023-10-18
コマンドラインオプション(-t)の秒指定によりＣＯＭデバイスの抜き差しによってウインドウが最小化状態から自動表示された場合に限り指定時間経過後に最小化に戻るように改良。手動でウンイドウの最小化を解除した場合は自動では戻らない。

2022-07-14
USBメモリなどCOMデバイス以外の抜き差しにも反応してしまっていたので修正。

2022-07-13
ウインドウが最小化されているときにポート抜き差ししても何も表示されないので元に戻すようにしてみた。また、コマンドラインオプションを指定できるようにしクライアント領域をダブルクリックしたときに使い方をメッセージボックスで表示するようにしてみた。間違ったコマンドラインオプションを指定したときにも表示される。あと最小化された状態でウインドウを閉じると元に戻せなくなる不具合を修正。

コマンドラインオプション
-d … ポートが抜かれたときにも表示する

2022-07-12
新たに接続されたポートが先頭行に表示されるように改良。それとポートが抜かれたときにも全面に出るのは少しウザい感じなので修正。ついでに挿されたポートは水色、抜かれたポートをグレーで表示するようにしてみた。

【Program】

/*
  comport.cpp - Windows COM Port Watcher

  Copyright (c) 2022 Sasapea's Lab. All right reserved.

  Reference from:

    http://yamatyuu.net/computer/program/comlist/index.html

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General
  Public License along with this library; if not, write to the
  Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  Boston, MA  02111-1307  USA
*/
#if defined(UNICODE) && !defined(_UNICODE)
  #define _UNICODE
#elif !defined(UNICODE) && defined(_UNICODE)
  #define UNICODE
#endif

#include <windows.h>
#include <setupapi.h>
#include <stdio.h>
#include <string.h>
#include <tchar.h>
#include <algorithm>
#include <vector>
#include <string>

#if defined(UNICODE)
  #define string std::wstring
#else
  #define string std::string
#endif

#define WHITE    RGB(255, 255, 255)
#define BLACK    RGB(  0,   0,   0)
#define ATTACH   RGB( 80, 150, 170)
#define DEATTACH RGB(128, 128, 128)

#define DBT_DEVICEARRIVAL 0x8000
#define DBT_DEVICEREMOVECOMPLETE 0x8004

const GUID GUID_DEVINTERFACE_COMPORT =
  { 0x86e0d1e0, 0x8089, 0x11d0, 0x9c, 0xe4, 0x08, 0x00, 0x3e, 0x30, 0x1f, 0x73 };

typedef std::vector<string> strings;

static BOOL    fShowDeattach;
static strings comports[2];
static TCHAR   inifile[MAX_PATH];
static UINT    uElapse;

void usage(HWND hwnd)
{
  MessageBox(hwnd, _T(
    "CommandLine Options:\n"
    "\n"
    "  -d   ... show deattach\n"
    "  -t n ... minimize timer [n] sec\n"
    "\n"
    "Copyright (C) 2022 Sasapea's Lab. All right reserved.\n"
  ), _T("COM Port Watcher. Version 1.1"), MB_OK | MB_ICONASTERISK);
}

size_t enumPort(strings& ports)
{
  ports.clear();
  HDEVINFO hDevInfo = SetupDiGetClassDevs(&GUID_DEVINTERFACE_COMPORT, 0, 0, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
  if (hDevInfo)
  {
    SP_DEVINFO_DATA data = { sizeof(data) };
    while (SetupDiEnumDeviceInfo(hDevInfo, ports.size(), &data))
    {
      HKEY key = SetupDiOpenDevRegKey(hDevInfo, &data, DICS_FLAG_GLOBAL, 0, DIREG_DEV, KEY_QUERY_VALUE);
      if (key)
      {
        string str;
        TCHAR name[256];
        DWORD size = sizeof(name);
        RegQueryValueEx(key, _T("PortName"), NULL, NULL, (LPBYTE)name, &size);
        str.append(name);
        str.append(_T(","));
        if (SetupDiGetDeviceRegistryProperty(hDevInfo, &data, SPDRP_DEVICEDESC, NULL, (LPBYTE)name, sizeof(name), NULL))
          str.append(name);
        str.append(_T(","));
        if (SetupDiGetDeviceRegistryProperty(hDevInfo, &data, SPDRP_HARDWAREID, NULL, (LPBYTE)name, sizeof(name), NULL))
          str.append(name);
        ports.push_back(str);
      }
    }
    SetupDiDestroyDeviceInfoList(hDevInfo);
  }
  return ports.size();
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
  static strings ports;
  PAINTSTRUCT ps;
  HDC hdc;
  TEXTMETRIC tm;
  RECT rc;
  size_t margin, line, index[2];
  TCHAR buf[16];
  switch (uMsg)
  {
    case WM_DEVICECHANGE:
      switch (wParam)
      {
        case DBT_DEVICEARRIVAL:
        case DBT_DEVICEREMOVECOMPLETE:
          if (enumPort(ports) != comports[0].size())
          {
            comports[1] = comports[0];
            comports[0] = ports;
            if (fShowDeattach || (comports[0].size() > comports[1].size()))
            {
              if (IsIconic(hwnd))
              {
                ShowWindow(hwnd, SW_RESTORE);
                if (uElapse)
                  SetTimer(hwnd, 1, uElapse, NULL);
              }
              SetWindowPos(hwnd, HWND_TOPMOST  , 0, 0, 0, 0, SWP_NOACTIVATE | SWP_SHOWWINDOW | SWP_NOSIZE | SWP_NOMOVE);
              SetWindowPos(hwnd, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOACTIVATE | SWP_SHOWWINDOW | SWP_NOSIZE | SWP_NOMOVE);
            }
            InvalidateRect(hwnd, NULL, TRUE);
          }
          break;
      }
      break;

    case WM_TIMER:
      ShowWindow(hwnd, SW_MINIMIZE);
      break;

    case WM_PAINT:
      hdc = BeginPaint(hwnd, &ps);
      GetTextMetrics(hdc, &tm);
      margin = tm.tmHeight / 8;
      index[0] = comports[0].size() < comports[1].size();
      index[1] = comports[0].size() > comports[1].size();
      line = comports[0].size() != comports[1].size();
      for (auto& str : comports[index[0]])
      {
        BOOL newPort = std::find(std::begin(comports[index[1]]), std::end(comports[index[1]]), str) == std::end(comports[index[1]]);
        SetTextColor(hdc, newPort ? BLACK                          : WHITE);
        SetBkColor  (hdc, newPort ? (index[0] ? DEATTACH : ATTACH) : BLACK);
        TextOut(hdc, margin, margin + (tm.tmHeight + margin) * (newPort ? 0 : line), str.c_str(), str.length());
        line += !newPort;
      }
      EndPaint(hwnd, &ps);
      return 0;

    case WM_CREATE:
      enumPort(comports[0]);
      comports[1] = comports[0];
      break;

    case WM_LBUTTONDBLCLK:
      usage(hwnd);
      break;

    case WM_MOVE:
    case WM_SIZE:
      KillTimer(hwnd, 1);
      if (!IsIconic(hwnd) && !IsZoomed(hwnd))
      {
        GetWindowRect(hwnd, &rc);
        _sntprintf(buf, sizeof(buf) / sizeof(buf[0]), _T("%ld"), rc.left);
        WritePrivateProfileString(_T("Window"), _T("x"), buf, inifile);
        _sntprintf(buf, sizeof(buf) / sizeof(buf[0]), _T("%ld"), rc.top);
        WritePrivateProfileString(_T("Window"), _T("y"), buf, inifile);
        _sntprintf(buf, sizeof(buf) / sizeof(buf[0]), _T("%ld"), rc.right - rc.left);
        WritePrivateProfileString(_T("Window"), _T("w"), buf, inifile);
        _sntprintf(buf, sizeof(buf) / sizeof(buf[0]), _T("%ld"), rc.bottom - rc.top);
        WritePrivateProfileString(_T("Window"), _T("h"), buf, inifile);
      }
      break;

    case WM_DESTROY:
      PostQuitMessage(0);
      break;
  }
  return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR lpCmdLine, int nCmdShow)
{
  HWND hwnd;
  MSG msg;
  WNDCLASS wcls;
  TCHAR *p;
  int i;

  for (i = 1; i < __argc; )
  {
    TCHAR *p = __argv[i++];
    if (*p == TCHAR('-'))
    {
      ++p;
      if (_tcscmp(p, _T("d")) == 0)
        fShowDeattach = TRUE;
      else if (_tcscmp(p, _T("t")) == 0)
      {
        if (i < __argc)
          uElapse = atoi(__argv[i++]) * 1000;
      }
      else
      {
        usage(HWND_DESKTOP);
        exit(1);
      }
    }
    else
    {
      usage(HWND_DESKTOP);
      exit(1);
    }
  }

  GetModuleFileName(hInstance, inifile, sizeof(inifile) / sizeof(inifile[0]));
  if (!(p = _tcsrchr(inifile, TCHAR('.'))))
    p = inifile + _tcslen(inifile);
  _tcscpy(p, _T(".ini"));

  wcls.style         = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;
  wcls.lpfnWndProc   = WindowProc;
  wcls.cbClsExtra    = wcls.cbWndExtra = 0;
  wcls.hInstance     = hInstance;
  wcls.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
  wcls.hCursor       = LoadCursor(NULL, IDC_ARROW);
  wcls.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
  wcls.lpszMenuName  = NULL;
  wcls.lpszClassName = _T("COMPORT");

  if (!RegisterClass(&wcls))
    return 1;

  hwnd = CreateWindow(
    wcls.lpszClassName, _T("COM Port Watcher"), WS_OVERLAPPEDWINDOW,
    GetPrivateProfileInt(_T("Window"), _T("x"), CW_USEDEFAULT, inifile),
    GetPrivateProfileInt(_T("Window"), _T("y"), CW_USEDEFAULT, inifile),
    GetPrivateProfileInt(_T("Window"), _T("w"), CW_USEDEFAULT, inifile),
    GetPrivateProfileInt(_T("Window"), _T("h"), CW_USEDEFAULT, inifile),
    NULL, NULL, hInstance, NULL
  );

  if (hwnd == NULL)
    return 2;

  ShowWindow(hwnd, nCmdShow);
  UpdateWindow(hwnd);

  while (GetMessage(&msg , NULL , 0 , 0))
    DispatchMessage(&msg);

  return msg.wParam;
}

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comport.cpp - Windows COM Port Watcher

Reference from:

http://yamatyuu.net/computer/program/comlist/index.html

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General

Public License along with this library; if not, write to the

Free Software Foundation, Inc., 59 Temple Place, Suite 330,

Boston, MA 02111-1307 USA

#if defined(UNICODE) && !defined(_UNICODE)

#define _UNICODE

#elif !defined(UNICODE) && defined(_UNICODE)

#define UNICODE

#endif

#include <windows.h>

#include <setupapi.h>

#include <stdio.h>

#include <string.h>

#include <tchar.h>

#include <algorithm>

#include <vector>

#include <string>

#if defined(UNICODE)

#define string std::wstring

#else

#define string std::string

#endif

#define WHITE RGB(255, 255, 255)

#define BLACK RGB( 0, 0, 0)

#define ATTACH RGB( 80, 150, 170)

#define DEATTACH RGB(128, 128, 128)

#define DBT_DEVICEARRIVAL 0x8000

#define DBT_DEVICEREMOVECOMPLETE 0x8004

const GUID GUID_DEVINTERFACE_COMPORT =

{ 0x86e0d1e0, 0x8089, 0x11d0, 0x9c, 0xe4, 0x08, 0x00, 0x3e, 0x30, 0x1f, 0x73 };

typedef std::vector<string> strings;

static BOOL fShowDeattach;

static strings comports[2];

static TCHAR inifile[MAX_PATH];

static UINT uElapse;

void usage(HWND hwnd)

{

MessageBox(hwnd, _T(

"CommandLine Options:\n"

"\n"

" -d ... show deattach\n"

" -t n ... minimize timer [n] sec\n"

"\n"

), _T("COM Port Watcher. Version 1.1"), MB_OK | MB_ICONASTERISK);

}

size_t enumPort(strings& ports)

{

ports.clear();

HDEVINFO hDevInfo = SetupDiGetClassDevs(&GUID_DEVINTERFACE_COMPORT, 0, 0, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);

if (hDevInfo)

{

SP_DEVINFO_DATA data = { sizeof(data) };

while (SetupDiEnumDeviceInfo(hDevInfo, ports.size(), &data))

{

HKEY key = SetupDiOpenDevRegKey(hDevInfo, &data, DICS_FLAG_GLOBAL, 0, DIREG_DEV, KEY_QUERY_VALUE);

if (key)

{

string str;

TCHAR name[256];

DWORD size = sizeof(name);

RegQueryValueEx(key, _T("PortName"), NULL, NULL, (LPBYTE)name, &size);

str.append(name);

str.append(_T(","));

if (SetupDiGetDeviceRegistryProperty(hDevInfo, &data, SPDRP_DEVICEDESC, NULL, (LPBYTE)name, sizeof(name), NULL))

str.append(name);

str.append(_T(","));

if (SetupDiGetDeviceRegistryProperty(hDevInfo, &data, SPDRP_HARDWAREID, NULL, (LPBYTE)name, sizeof(name), NULL))

str.append(name);

ports.push_back(str);

}

SetupDiDestroyDeviceInfoList(hDevInfo);

}

return ports.size();

}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)

{

static strings ports;

PAINTSTRUCT ps;

HDC hdc;

TEXTMETRIC tm;

RECT rc;

size_t margin, line, index[2];

TCHAR buf[16];

switch (uMsg)

{

case WM_DEVICECHANGE:

switch (wParam)

{

case DBT_DEVICEARRIVAL:

case DBT_DEVICEREMOVECOMPLETE:

if (enumPort(ports) != comports[0].size())

{

comports[1] = comports[0];

comports[0] = ports;

if (fShowDeattach || (comports[0].size() > comports[1].size()))

{

if (IsIconic(hwnd))

{

ShowWindow(hwnd, SW_RESTORE);

if (uElapse)

SetTimer(hwnd, 1, uElapse, NULL);

}

SetWindowPos(hwnd, HWND_TOPMOST , 0, 0, 0, 0, SWP_NOACTIVATE | SWP_SHOWWINDOW | SWP_NOSIZE | SWP_NOMOVE);

SetWindowPos(hwnd, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOACTIVATE | SWP_SHOWWINDOW | SWP_NOSIZE | SWP_NOMOVE);

}

InvalidateRect(hwnd, NULL, TRUE);

}

break;

}

break;

case WM_TIMER:

ShowWindow(hwnd, SW_MINIMIZE);

break;

case WM_PAINT:

hdc = BeginPaint(hwnd, &ps);

GetTextMetrics(hdc, &tm);

margin = tm.tmHeight / 8;

index[0] = comports[0].size() < comports[1].size();

index[1] = comports[0].size() > comports[1].size();

line = comports[0].size() != comports[1].size();

for (auto& str : comports[index[0]])

{

BOOL newPort = std::find(std::begin(comports[index[1]]), std::end(comports[index[1]]), str) == std::end(comports[index[1]]);

SetTextColor(hdc, newPort ? BLACK : WHITE);

SetBkColor (hdc, newPort ? (index[0] ? DEATTACH : ATTACH) : BLACK);

TextOut(hdc, margin, margin + (tm.tmHeight + margin) * (newPort ? 0 : line), str.c_str(), str.length());

line += !newPort;

}

EndPaint(hwnd, &ps);

return 0;

case WM_CREATE:

enumPort(comports[0]);

comports[1] = comports[0];

break;

case WM_LBUTTONDBLCLK:

usage(hwnd);

break;

case WM_MOVE:

case WM_SIZE:

KillTimer(hwnd, 1);

if (!IsIconic(hwnd) && !IsZoomed(hwnd))

{

GetWindowRect(hwnd, &rc);

_sntprintf(buf, sizeof(buf) / sizeof(buf[0]), _T("%ld"), rc.left);

WritePrivateProfileString(_T("Window"), _T("x"), buf, inifile);

_sntprintf(buf, sizeof(buf) / sizeof(buf[0]), _T("%ld"), rc.top);

WritePrivateProfileString(_T("Window"), _T("y"), buf, inifile);

_sntprintf(buf, sizeof(buf) / sizeof(buf[0]), _T("%ld"), rc.right - rc.left);

WritePrivateProfileString(_T("Window"), _T("w"), buf, inifile);

_sntprintf(buf, sizeof(buf) / sizeof(buf[0]), _T("%ld"), rc.bottom - rc.top);

WritePrivateProfileString(_T("Window"), _T("h"), buf, inifile);

}

break;

case WM_DESTROY:

PostQuitMessage(0);

break;

}

return DefWindowProc(hwnd, uMsg, wParam, lParam);

}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR lpCmdLine, int nCmdShow)

{

HWND hwnd;

MSG msg;

WNDCLASS wcls;

TCHAR *p;

int i;

for (i = 1; i < __argc; )

{

TCHAR *p = __argv[i++];

if (*p == TCHAR('-'))

{

++p;

if (_tcscmp(p, _T("d")) == 0)

fShowDeattach = TRUE;

else if (_tcscmp(p, _T("t")) == 0)

{

if (i < __argc)

uElapse = atoi(__argv[i++]) * 1000;

}

else

{

usage(HWND_DESKTOP);

exit(1);

}

else

{

usage(HWND_DESKTOP);

exit(1);

}

GetModuleFileName(hInstance, inifile, sizeof(inifile) / sizeof(inifile[0]));

if (!(p = _tcsrchr(inifile, TCHAR('.'))))

p = inifile + _tcslen(inifile);

_tcscpy(p, _T(".ini"));

wcls.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;

wcls.lpfnWndProc = WindowProc;

wcls.cbClsExtra = wcls.cbWndExtra = 0;

wcls.hInstance = hInstance;

wcls.hIcon = LoadIcon(NULL, IDI_APPLICATION);

wcls.hCursor = LoadCursor(NULL, IDC_ARROW);

wcls.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);

wcls.lpszMenuName = NULL;

wcls.lpszClassName = _T("COMPORT");

if (!RegisterClass(&wcls))

return 1;

hwnd = CreateWindow(

wcls.lpszClassName, _T("COM Port Watcher"), WS_OVERLAPPEDWINDOW,

GetPrivateProfileInt(_T("Window"), _T("x"), CW_USEDEFAULT, inifile),

GetPrivateProfileInt(_T("Window"), _T("y"), CW_USEDEFAULT, inifile),

GetPrivateProfileInt(_T("Window"), _T("w"), CW_USEDEFAULT, inifile),

GetPrivateProfileInt(_T("Window"), _T("h"), CW_USEDEFAULT, inifile),

NULL, NULL, hInstance, NULL

);

if (hwnd == NULL)

return 2;

ShowWindow(hwnd, nCmdShow);

UpdateWindow(hwnd);

while (GetMessage(&msg , NULL , 0 , 0))

DispatchMessage(&msg);

return msg.wParam;

}

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