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143 lines
3.8 KiB
143 lines
3.8 KiB
/* HTMLPREV.CPP
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**
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** Copyright (c) 1997-1999 Microsoft Corporation. All Rights Reserved.
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**
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** Display a preview of the HTML wallpaper background,
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** complete with rudimentary palette handling and stretching
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** of bitmaps to fit the preview screen.
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**
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*/
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#include <windows.h>
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#include <mbctype.h>
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#include <objbase.h>
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#include <initguid.h>
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#include "..\inc\thmbguid.h"
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#include "..\inc\thmbobj.h"
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#define WM_HTML_BITMAP (WM_USER + 275) // IThumbnail::GetBitmap msg
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#define HTML_TIMER 777 // Unique timer ID
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// WARNING THESE ARE ALSO DEFINED IN FROST.H -- JUST DON'T WANT TO
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// INCLUDE ALL OF FROST.H HERE:
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#define MAX_MSGLEN 512
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// strings ids
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#define STR_APPNAME 0 // Application name (for title bar)
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#define STR_ERRHTML 26 // Error getting HTML wallpaper preview
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// GLOBALS
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extern "C" HWND hWndApp;
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IThumbnail *g_pthumb = NULL; // Html to Bitmap converter
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extern "C" BOOL InitHTMLBM()
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{
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HRESULT hr = E_FAIL;
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// Bring in the library
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hr = CoInitialize(NULL);
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if (FAILED(hr))
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{
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return FALSE;
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}
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hr = CoCreateInstance(CLSID_Thumbnail, NULL, CLSCTX_INPROC_SERVER,
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IID_IThumbnail, (void **)&g_pthumb);
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if(SUCCEEDED(hr))
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{
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g_pthumb->Init(hWndApp, WM_HTML_BITMAP);
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return TRUE;
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}
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else
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{
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// CoUninitialize();
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g_pthumb = NULL;
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return FALSE;
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}
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}
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extern "C" HBITMAP HtmlToBmp(LPCTSTR szHTML, LONG lWidth, LONG lHeight)
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{
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HBITMAP hbmWall;
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#ifndef UNICODE
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WCHAR wszFile[MAX_PATH];
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#endif
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DWORD dwItem = 13; // Random choice of numbers for dwItem
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UINT uCodePage;
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MSG msg;
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TCHAR szMessage[MAX_MSGLEN];
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TCHAR szTitle[MAX_MSGLEN];
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UINT_PTR uTimer = 0;
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uCodePage = _getmbcp();
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// Paranoid check just in case
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if (!g_pthumb) {
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return NULL;
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}
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// MessageBox(hWndApp, szHTML, TEXT("Calling GetBitMap"), MB_OK | MB_APPLMODAL);
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#ifndef UNICODE
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// IThumbnail interfaces expect wide strings. Need to
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// convert ANSI szHTML into UNICODE.
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MultiByteToWideChar(uCodePage, 0, szHTML, -1,
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wszFile, MAX_PATH);
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g_pthumb->GetBitmap(wszFile, dwItem, lWidth, lHeight);
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#else
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g_pthumb->GetBitmap(szHTML, dwItem, lWidth, lHeight);
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#endif
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// Set a timer so we don't spin forever waiting on a dead GetBitMap call
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uTimer = SetTimer(hWndApp, HTML_TIMER, 60000 /*60 sec*/, NULL);
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LoadString(NULL, STR_APPNAME, szTitle, MAX_MSGLEN);
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LoadString(NULL, STR_ERRHTML, szMessage, MAX_MSGLEN);
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ZeroMemory(&msg, sizeof(MSG));
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while (TRUE) {
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// First check for Bitmap done message
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ZeroMemory(&msg, sizeof(MSG));
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if (PeekMessage(&msg, hWndApp, WM_HTML_BITMAP,
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WM_HTML_BITMAP, PM_REMOVE)) {
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if (msg.wParam == dwItem && msg.lParam) {
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hbmWall = (HBITMAP)msg.lParam;
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if (uTimer) KillTimer(hWndApp, uTimer);
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return hbmWall;
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}
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else {
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if (uTimer) KillTimer(hWndApp, uTimer);
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MessageBox(hWndApp, szMessage, szTitle,
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MB_OK | MB_APPLMODAL | MB_ICONERROR);
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return NULL;
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}
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}
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// Now check to see if we've timed-out waiting on Getbitmap
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ZeroMemory(&msg, sizeof(MSG));
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if (PeekMessage(&msg, hWndApp, WM_TIMER, WM_TIMER, PM_REMOVE)) {
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if (msg.wParam == HTML_TIMER) {
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// We timed-out
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MessageBox(hWndApp, szMessage, szTitle,
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MB_OK | MB_APPLMODAL | MB_ICONERROR);
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return NULL;
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}
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}
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} // End While true
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// SHOULDN'T EVER FALL THROUGH TO THIS BUT JUST IN CASE
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return NULL;
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}
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extern "C" void CleanUp()
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{
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if (g_pthumb) g_pthumb->Release();
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g_pthumb = NULL;
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CoUninitialize();
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return;
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}
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