extensions/source/scanner/twain32shim.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  */
  10
  11 #pragma once
  12
  13 #include <prewin.h>
  14 #include <Shlobj.h>
  15 #include <postwin.h>
  16 #include <exception>
  17 #include <string>
  18 #include <sstream>
  19 #include <iomanip>
  20
  21 // Don't use WM_USER
  22
  23 // Notifications from shim to parent; wParam = event id
  24 #define WM_TWAIN_EVENT (WM_USER + 1)
  25
  26 // lParam is HWND
  27 #define TWAIN_EVENT_NOTIFYHWND 0
  28
  29 // lParam is result (bool indicating success)
  30 #define TWAIN_EVENT_REQUESTRESULT 1
  31
  32 // lParam is ignored
  33 #define TWAIN_EVENT_NONE 10
  34 #define TWAIN_EVENT_QUIT 11
  35 #define TWAIN_EVENT_SCANNING 12
  36
  37 // lParam is HANDLE to shared file mapping valid in context of parent process
  38 #define TWAIN_EVENT_XFER 13
  39
  40 // Requests from parent to shim; wParam = request id
  41 #define WM_TWAIN_REQUEST (WM_USER + 2)
  42
  43 #define TWAIN_REQUEST_QUIT 0 // Destroy()
  44 #define TWAIN_REQUEST_SELECTSOURCE 1
  45 #define TWAIN_REQUEST_INITXFER 2
  46
  47 // messages starting from this are not to be used for interprocess communications
  48 #define WM_SHIM_INTERNAL (WM_USER + 200)
  49
  50 template <typename IntType> std::string Num2Hex(IntType n)
  51 {
  52     std::stringstream sMsg;
  53     sMsg << "0x" << std::uppercase << std::setfill('0') << std::setw(sizeof(n) * 2) << std::hex
  54          << n;
  55     return sMsg.str();
  56 }
  57
  58 void ThrowWin32Error(const char* sFunc, DWORD nWin32Error)
  59 {
  60     std::stringstream sMsg;
  61     sMsg << sFunc << " failed with Win32 error code " << Num2Hex(nWin32Error) << "!";
  62
  63     throw std::exception(sMsg.str().c_str());
  64 }
  65
  66 void ThrowLastError(const char* sFunc) { ThrowWin32Error(sFunc, GetLastError()); }
  67
  68 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */