86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
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// Copyright (C) Microsoft Corporation 1996-1997, All Rights reserved.
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#include "windows.h"
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#include "htmlhelp.h"
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#pragma data_seg(".text", "CODE")
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static const char txtHHCtrl[] = "hhctrl.ocx";
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static const char txtInProc[] = "CLSID\\{ADB880A6-D8FF-11CF-9377-00AA003B7A11}\\InprocServer32";
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#pragma data_seg()
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HWND (WINAPI *pHtmlHelpA)(HWND hwndCaller, LPCSTR pszFile, UINT uCommand, DWORD_PTR dwData);
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HWND (WINAPI *pHtmlHelpW)(HWND hwndCaller, PCWSTR pszFile, UINT uCommand, DWORD_PTR dwData);
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static BOOL GetRegisteredLocation(LPTSTR pszPathname)
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{
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BOOL bReturn = FALSE;
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HKEY hKey;
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if (RegOpenKeyEx(HKEY_CLASSES_ROOT, txtInProc, 0, KEY_READ, &hKey) == ERROR_SUCCESS) {
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DWORD dwSize = MAX_PATH;
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if (RegQueryValueEx(hKey, "", 0, 0, (PBYTE) pszPathname, &dwSize) == ERROR_SUCCESS) {
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bReturn = TRUE;
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}
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}
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else
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return FALSE;
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RegCloseKey(hKey);
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return bReturn;
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}
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extern "C"
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HWND WINAPI HtmlHelpA(HWND hwndCaller, LPCSTR pszFile, UINT uCommand, DWORD_PTR dwData)
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{
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static HMODULE g_hmodHHCtrl;
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static BOOL g_fTriedAndFailed;
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if (!g_hmodHHCtrl && !g_fTriedAndFailed) {
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char szHHCtrl[MAX_PATH];
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if (GetRegisteredLocation(szHHCtrl))
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g_hmodHHCtrl = LoadLibrary(szHHCtrl); // try registered location
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if (!g_hmodHHCtrl)
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g_hmodHHCtrl = LoadLibrary(txtHHCtrl); // try normal location
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if (g_hmodHHCtrl == NULL) {
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g_fTriedAndFailed = TRUE;
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return NULL;
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}
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}
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if (!pHtmlHelpA) {
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(FARPROC&) pHtmlHelpA = GetProcAddress(g_hmodHHCtrl, ATOM_HTMLHELP_API_ANSI);
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if (pHtmlHelpA == NULL) {
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g_fTriedAndFailed = TRUE;
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return NULL;
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}
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}
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return pHtmlHelpA(hwndCaller, pszFile, uCommand, dwData);
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}
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extern "C"
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HWND WINAPI HtmlHelpW(HWND hwndCaller, PCWSTR pszFile, UINT uCommand, DWORD_PTR dwData)
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{
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static HMODULE g_hmodHHCtrl;
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static BOOL g_fTriedAndFailed;
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if (!g_hmodHHCtrl && !g_fTriedAndFailed) {
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char szHHCtrl[MAX_PATH];
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if (GetRegisteredLocation(szHHCtrl))
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g_hmodHHCtrl = LoadLibrary(szHHCtrl); // try registered location
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if (!g_hmodHHCtrl)
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g_hmodHHCtrl = LoadLibrary(txtHHCtrl);
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if (g_hmodHHCtrl == NULL) {
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g_fTriedAndFailed = TRUE;
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return NULL;
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}
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}
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if (!pHtmlHelpW) {
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(FARPROC&) pHtmlHelpW = GetProcAddress(g_hmodHHCtrl, ATOM_HTMLHELP_API_UNICODE);
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if (pHtmlHelpW == NULL) {
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g_fTriedAndFailed = TRUE;
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return NULL;
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}
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}
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return pHtmlHelpW(hwndCaller, pszFile, uCommand, dwData);
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}
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