ShellLink.cpp

/*
Module : ShellLink.cpp
Purpose: NSIS Plug-in for retriving shell link information
Created: 12/16/2003
Last Update: 01/14/2004
                          
Copyright (c) 2004 Angelo Mandato.  
See ShellLink.html for more information


Modified: 21/09/2005
Author:   Shengalts Aleksander aka Instructor (Shengalts@mail.ru)
Changes:  -code has been rewritten
          -added functions to change shell link information
          -reduced dll size 44Kb -> 4Kb
*/

//  Uncomment for debugging message boxes
//#define SHELLLINK_DEBUG

#include <windows.h>
#include <shlobj.h>

#define xatoi
#include <nsis/pluginapi.h>

#define NSISFUNC(name) extern "C" void __declspec(dllexport) name(HWND hWndParent, int string_size, TCHAR* variables, stack_t** stacktop, extra_parameters* extra)

#define SHELLLINKTYPE_GETARGS 1
#define SHELLLINKTYPE_GETDESC 2
#define SHELLLINKTYPE_GETHOTKEY 3
#define SHELLLINKTYPE_GETICONLOC 4
#define SHELLLINKTYPE_GETICONINDEX 5
#define SHELLLINKTYPE_GETPATH 6
#define SHELLLINKTYPE_GETSHOWMODE 7
#define SHELLLINKTYPE_GETWORKINGDIR 8
#define SHELLLINKTYPE_SETARGS 9
#define SHELLLINKTYPE_SETDESC 10
#define SHELLLINKTYPE_SETHOTKEY 11
#define SHELLLINKTYPE_SETICONLOC 12
#define SHELLLINKTYPE_SETICONINDEX 13
#define SHELLLINKTYPE_SETPATH 14
#define SHELLLINKTYPE_SETSHOWMODE 15
#define SHELLLINKTYPE_SETWORKINGDIR 16
#define SHELLLINKTYPE_SETRUNASADMIN 17

void ShortCutData(int nType);

//Get
NSISFUNC(GetShortCutArgs)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_GETARGS);
}

NSISFUNC(GetShortCutDescription)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_GETDESC);
}

NSISFUNC(GetShortCutHotkey)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_GETHOTKEY);
}

NSISFUNC(GetShortCutIconLocation)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_GETICONLOC);
}

NSISFUNC(GetShortCutIconIndex)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_GETICONINDEX);
}

NSISFUNC(GetShortCutTarget)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_GETPATH);
}

NSISFUNC(GetShortCutShowMode)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_GETSHOWMODE);
}

NSISFUNC(GetShortCutWorkingDirectory)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_GETWORKINGDIR);
}

//Set
NSISFUNC(SetShortCutArgs)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_SETARGS);
}

NSISFUNC(SetShortCutDescription)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_SETDESC);
}

NSISFUNC(SetShortCutHotkey)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_SETHOTKEY);
}

NSISFUNC(SetShortCutIconLocation)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_SETICONLOC);
}

NSISFUNC(SetShortCutIconIndex)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_SETICONINDEX);
}

NSISFUNC(SetShortCutTarget)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_SETPATH);
}

NSISFUNC(SetShortCutShowMode)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_SETSHOWMODE);
}

NSISFUNC(SetShortCutWorkingDirectory)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_SETWORKINGDIR);
}

NSISFUNC(SetRunAsAdministrator)
{
  EXDLL_INIT();
	ShortCutData(SHELLLINKTYPE_SETRUNASADMIN);
}

void ShortCutData(int nType)
{
	HRESULT hRes;
	IShellLink* psl;
	IPersistFile* ppf;

  int nBuf;
  WORD wHotkey;
  TCHAR* szBuf = (TCHAR*)LocalAlloc(LPTR, sizeof(TCHAR)*MAX_PATH);
  TCHAR* szBuf2 = (TCHAR*)LocalAlloc(LPTR, sizeof(TCHAR)*MAX_PATH);

	popstring(szBuf);
	if (nType > SHELLLINKTYPE_GETWORKINGDIR) popstring(szBuf2);

	hRes=CoCreateInstance(CLSID_ShellLink, NULL, CLSCTX_INPROC_SERVER, IID_IShellLink, (LPVOID*) &psl);
	if (hRes == S_OK)
	{
		hRes=psl->QueryInterface(IID_IPersistFile, (LPVOID*) &ppf);
		if (hRes == S_OK)
		{
#ifdef UNICODE
			hRes=ppf->Load(szBuf, STGM_READWRITE);
#else
      WCHAR* wszPath = (WCHAR*)LocalAlloc(LPTR, sizeof(WCHAR)*MAX_PATH);
			MultiByteToWideChar(CP_ACP, 0, szBuf, -1, wszPath, MAX_PATH);
			hRes=ppf->Load(wszPath, STGM_READWRITE);
      LocalFree(wszPath);
#endif
			if (hRes == S_OK)
			{
				if (nType <= SHELLLINKTYPE_GETWORKINGDIR)
				{
					//Get
					switch(nType)
					{
						case SHELLLINKTYPE_GETARGS:
						{
							hRes=psl->GetArguments(szBuf, MAX_PATH);
							if (hRes != S_OK) szBuf[0]='\0';
						}; break;
						case SHELLLINKTYPE_GETDESC: 
						{
							hRes=psl->GetDescription(szBuf, MAX_PATH);
							if (hRes != S_OK) szBuf[0]='\0';
						}; break;
						case SHELLLINKTYPE_GETHOTKEY: 
						{
							hRes=psl->GetHotkey(&wHotkey);
							if (hRes == S_OK) wsprintf(szBuf, TEXT("%d"), wHotkey);
							else szBuf[0]='\0';
						}; break;
						case SHELLLINKTYPE_GETICONLOC: 
						{
							hRes=psl->GetIconLocation(szBuf, MAX_PATH, &nBuf);
							if (hRes != S_OK) szBuf[0]='\0';
						}; break;
						case SHELLLINKTYPE_GETICONINDEX: 
						{
							hRes=psl->GetIconLocation(szBuf, MAX_PATH, &nBuf);
							if (hRes == S_OK) wsprintf(szBuf, TEXT("%d"), nBuf);
							else szBuf[0]='\0';
						}; break;
						case SHELLLINKTYPE_GETPATH: 
						{
							WIN32_FIND_DATA fd;

							hRes=psl->GetPath(szBuf, MAX_PATH, &fd, SLGP_UNCPRIORITY);
							if (hRes != S_OK) szBuf[0]='\0';
						}; break;
						case SHELLLINKTYPE_GETSHOWMODE: 
						{
							hRes=psl->GetShowCmd(&nBuf);
							if (hRes == S_OK) wsprintf(szBuf, TEXT("%d"), nBuf);
							else szBuf[0]='\0';
						}; break;
						case SHELLLINKTYPE_GETWORKINGDIR:
						{ 
							hRes=psl->GetWorkingDirectory(szBuf, MAX_PATH);
							if (hRes != S_OK) szBuf[0]='\0';
						}; break;
					}
				}
				else
				{
					//Set
					switch(nType)
					{
						case SHELLLINKTYPE_SETARGS:
						{
							hRes=psl->SetArguments(szBuf2);
						}; break;
						case SHELLLINKTYPE_SETDESC: 
						{
							hRes=psl->SetDescription(szBuf2);
						}; break;
						case SHELLLINKTYPE_SETHOTKEY:
						{
							wHotkey=(unsigned short)myatoi(szBuf2);
							hRes=psl->SetHotkey(wHotkey);
						}; break;
						case SHELLLINKTYPE_SETICONLOC:
						{
							hRes=psl->GetIconLocation(szBuf, MAX_PATH, &nBuf);
							if (hRes == S_OK)
								hRes=psl->SetIconLocation(szBuf2, nBuf);
						}; break;
						case SHELLLINKTYPE_SETICONINDEX: 
						{
							int nBuf2;
							nBuf=myatoi(szBuf2);

							hRes=psl->GetIconLocation(szBuf, MAX_PATH, &nBuf2);
							if (hRes == S_OK)
								hRes=psl->SetIconLocation(szBuf, nBuf);
						}; break;
						case SHELLLINKTYPE_SETPATH: 
						{
							hRes=psl->SetPath(szBuf2);
						}; break;
						case SHELLLINKTYPE_SETSHOWMODE: 
						{
							nBuf=myatoi(szBuf2);
							hRes=psl->SetShowCmd(nBuf);
						}; break;
						case SHELLLINKTYPE_SETWORKINGDIR:
						{
							hRes=psl->SetWorkingDirectory(szBuf2);
						}; break;
						case SHELLLINKTYPE_SETRUNASADMIN:
						{
              IShellLinkDataList* pdl;
              hRes=psl->QueryInterface(IID_IShellLinkDataList, (void**)&pdl);
              if (hRes == S_OK)
              {
                DWORD dwFlags = 0;
							  hRes=pdl->GetFlags(&dwFlags);
                if (hRes == S_OK && (dwFlags & SLDF_RUNAS_USER) != SLDF_RUNAS_USER)
                  hRes=pdl->SetFlags(dwFlags | SLDF_RUNAS_USER);
                pdl->Release();
              }
						}; break;
					}
					if (hRes == S_OK) hRes=ppf->Save(NULL, FALSE);
					#ifdef SHELLLINK_DEBUG
					else MessageBox(hwndParent, TEXT("ERROR: Save()"), TEXT("ShellLink plug-in"), MB_OK);
					#endif
				}
			}
			#ifdef SHELLLINK_DEBUG
			else MessageBox(hwndParent, TEXT("ERROR: Load()"), TEXT("ShellLink plug-in"), MB_OK);
			#endif
		}
		#ifdef SHELLLINK_DEBUG
		else MessageBox(hwndParent, TEXT("CShellLink::Initialise, Failed in call to QueryInterface for IPersistFile, HRESULT was %x\n"), TEXT("ShellLink plug-in"), MB_OK);
		#endif

		// Cleanup:
		if (ppf) ppf->Release();
		if (psl) psl->Release();
	}
	#ifdef SHELLLINK_DEBUG
	else MessageBox(hwndParent, TEXT("ERROR: CoCreateInstance()"), TEXT("ShellLink plug-in"), MB_OK);
	#endif

	if (hRes == S_OK)
	{
		if (nType <= SHELLLINKTYPE_GETWORKINGDIR) pushstring(szBuf);
		else pushstring(TEXT("0"));
	}
	else
	{
		if (nType <= SHELLLINKTYPE_GETWORKINGDIR) pushstring(TEXT(""));
		else pushstring(TEXT("-1"));
	}

  LocalFree(szBuf);
  LocalFree(szBuf2);
}

BOOL WINAPI DllMain(HANDLE hInst, ULONG ul_reason_for_call, LPVOID lpReserved)
{
	return TRUE;
}