code_twain/twain/load_sane.cpp

#include "pch.h"
#include "load_sane.h"
#include <string>
#include <shellapi.h>			// for SHFileOperationW
#include "../../sdk/include/huagao/brand.h"

#pragma comment(lib, "shell32.lib")

namespace load_sane_util
{
	static std::wstring sane_path(L"");
	static HMODULE		sane_module(NULL);
	static int (__stdcall* sane_inst)(SCANNERID, ISaneInvoker**, bool) = NULL;
	static int(__stdcall* is_on)(SCANNERID) = NULL;
	static int(__stdcall* init)(void*) = NULL;
	static int(__stdcall* uninit)(void*) = NULL;
	static void(__stdcall* log)(const wchar_t*, int) = NULL;

	static std::string u2m(const wchar_t* u, int page)
	{
		char* ansi = NULL;
		int		len = 0;
		std::string mb("");

		len = WideCharToMultiByte(page, 0, u, lstrlenW(u), NULL, 0, NULL, NULL);
		ansi = new char[len + 2];
		len = WideCharToMultiByte(page, 0, u, lstrlenW(u), ansi, len, NULL, NULL);
		ansi[len--] = 0;
		mb = ansi;
		delete[] ansi;

		return mb;
	}
	static std::wstring m2u(const char* m, int page)
	{
		wchar_t* unic = NULL;
		int		len = 0;
		std::wstring u(L"");

		len = MultiByteToWideChar(page, 0, m, lstrlenA(m), NULL, 0);
		unic = new wchar_t[len + 2];
		len = MultiByteToWideChar(page, 0, m, lstrlenA(m), unic, len);
		unic[len--] = 0;
		u = unic;
		delete[] unic;

		return u;
	}
	static std::wstring reg_read(HKEY root, const wchar_t* path, const wchar_t* name)
	{
		HKEY	key = NULL;

		RegOpenKeyW(root, path, &key);
		if (!key)
			return L"";

		wchar_t* buf = NULL;
		DWORD	len = 0;
		DWORD	type = REG_SZ;
		std::wstring ret(L"");

		RegQueryValueExW(key, name, NULL, &type, (LPBYTE)buf, &len);
		if (len)
		{
			buf = new wchar_t[len + 4];
			memset(buf, 0, (len + 4) * sizeof(*buf));
			RegQueryValueExW(key, name, NULL, &type, (LPBYTE)buf, &len);
			ret = buf;
			delete[] buf;
		}
		RegCloseKey(key);

		return ret;
	}
	static std::wstring reg_get_app_installing_path(std::wstring* rp = NULL)
	{
		std::wstring	path(m2u(PRODUCT_VENDOR, CP_ACP)), key(L"DriverPath");

		path.insert(0, L"Software\\");
		path += L"Scan";

		if (sizeof(void*) != 4)
			key += L"64";

		if (rp)
			*rp = path + L"\\" + key;
			
		return reg_read(HKEY_LOCAL_MACHINE, path.c_str(), key.c_str());
	}
	std::string to_web_utf(const std::wstring& unic)
	{
		std::string	webu("");
		char		buf[20] = { 0 };

		for (size_t i = 0; i < unic.length(); ++i)
		{
			wchar_t	v = unic[i];
			if (v <= 0x7f)
				webu.append(1, (char)v);
			else
			{
				sprintf_s(buf, _countof(buf) - 1, "\\u%04X", v);
				webu += buf;
			}
		}

		return webu;
	}
	static int load_dll(const wchar_t* path_dll, HMODULE* dll)
	{
		HMODULE h = NULL;	// LoadLibraryW(path_dll);	// 3rd APP like Dynamsoft will treat the exception, so we force to SetDllDirectoryW first and load later
		int		ret = 0;	// GetLastError();
		wchar_t	info[128] = { 0 };

		// SetSearchPathMode(BASE_SEARCH_PATH_ENABLE_SAFE_SEARCHMODE);
		swprintf_s(info, _countof(info) - 1, L" = %d\r\n", ret);
		OutputDebugStringW((L"[TWAIN]Load: " + std::wstring(path_dll) + info).c_str());
		if (!h && (ret == ERROR_MOD_NOT_FOUND || ret == ERROR_BAD_EXE_FORMAT || ret == 0))
		{
			std::wstring	dir(path_dll);
			size_t			pos = dir.rfind(L'\\');
			wchar_t			path[MAX_PATH] = { 0 };

			GetDllDirectoryW(_countof(path) - 1, path);
			if (pos != std::wstring::npos)
				dir.erase(pos);
			OutputDebugStringW((L"[TWAIN]Load: try change directory to " + dir + L"\r\n").c_str());
			SetDllDirectoryW(dir.c_str());
			h = LoadLibraryW(path_dll);
			// h = LoadLibraryExW(path_dll, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
			ret = GetLastError();
			swprintf_s(info, _countof(info) - 1, L" = %d\r\n", ret);
			OutputDebugStringW((L"[TWAIN]Load: " + std::wstring(path_dll) + info).c_str());
			OutputDebugStringW((L"[TWAIN]Load: restore directory to " + std::wstring(path) + L"\r\n").c_str());
			SetDllDirectoryW(path);
		}

		if (dll)
			*dll = h;

		return ret;
	}

	bool initialize(HMODULE me)
	{
		std::wstring	reg_path(L"");
		bool ret = false;
		sane_path = reg_get_app_installing_path(&reg_path);
		if (!sane_path.empty())
		{
			sane_path += /*L"\\sane.dll";*/ L"\\" + m2u(MODULE_NAME_SANE, CP_UTF8);
			load_dll(sane_path.c_str(), &sane_module);
			if (sane_module)
			{
				*((FARPROC*)&init) = GetProcAddress(sane_module, "initialize");
				*((FARPROC*)&sane_inst) = GetProcAddress(sane_module, "open_scanner");
				*((FARPROC*)&is_on) = GetProcAddress(sane_module, "is_scanner_online");
				*((FARPROC*)&uninit) = GetProcAddress(sane_module, "uninitialize");
				*((FARPROC*)&log) = GetProcAddress(sane_module, "log_info");
				ret = is_ok();
				if (ret)
					ret = init(NULL) == 0;
			}
		}

		if (!ret)
			MessageBoxW(NULL, (reg_path + L": " + sane_path).c_str(), L"Load scanner driver failed:", MB_OK);

		return ret;
	}
	bool is_ok(void)
	{
		wchar_t	info[128] = { 0 };
		swprintf_s(info, _countof(info) - 1, L"[TWAIN]Load: sane_inst: %s, is_on: %s, init: %s, uninit: %s\r\n"
			, sane_inst != NULL ? "ok" : "not found"
			, is_on != NULL ? "ok" : "not found"
			, init != NULL ? "ok" : "not found"
			, uninit != NULL ? "ok" : "not found");

		return sane_inst != NULL && is_on != NULL && init != NULL && uninit != NULL;
	}
	bool is_online(SCANNERID guid)
	{
		if (is_on)
			return is_on(guid);
		else
			return false;
	}
	ISaneInvoker* open(SCANNERID guid, int* err, bool last_try)
	{
		ISaneInvoker* ret = NULL;
		int	code = 0;

		if (!err)
			err = &code;

		if (sane_inst)
			*err = sane_inst(guid, &ret, last_try);

		return ret;
	}
	void uninitialize(void)
	{
		sane_inst = NULL;
		is_on = NULL;
		init = NULL;
		log = NULL;

		if (uninit)
			uninit(NULL);
		uninit = NULL;

		if (sane_module)
		{
			FreeLibrary(sane_module);
			sane_module = NULL;
		}
		sane_path = L"";
		sane_inst = NULL;
	}
	void log_info(const wchar_t* info, int level)
	{
		if (log)
			log(info, level);
	}

	std::string utf82ansi(const char* utf8)
	{
		return u2m(m2u(utf8, CP_UTF8).c_str(), CP_ACP);
	}
	std::string ansi2utf8(const char* ansi)
	{
		return u2m(m2u(ansi, CP_ACP).c_str(), CP_UTF8);
	}
	std::wstring ansi2unic(const char* ansi)
	{
		return m2u(ansi, CP_ACP);
	}

	int move_file(const char* from, const char* to)
	{
		return move_file(ansi2unic(from).c_str(), ansi2unic(to).c_str());
	}
	int move_file(const wchar_t* from, const wchar_t* to)
	{
		SHFILEOPSTRUCTW	fo = { 0 };
		int				ret = 0;
		std::wstring	_from(from), _to(to ? to : L"");

		if (wcsicmp(from, to) == 0)
			return 0;

		_from += std::wstring((wchar_t*)&ret, 2);		// ended with double '\0'
		fo.pFrom = &_from[0];
		_to += std::wstring((wchar_t*)&ret, 2);			// ended with double '\0'
		fo.pTo = &_to[0];
		fo.fFlags = FOF_NO_UI | FOF_NO_CONNECTED_ELEMENTS;	// 614 | 2000
		fo.wFunc = FO_MOVE;

		ret = SHFileOperationW(&fo);
		if (ret == /*DE_SAMEFILE*/0x71)
			ret = 0;

		return ret;
	}
};