eccbrowsefordirectory.cpp

ECC (椭圆曲线加密算法) 的源代码c++builder,很难得到的源代码

/* ==========================================================================

	Ecc - Erik's Code Collection
	Copyright (C) 2003 - Erik Dienske

	This file is part of Ecc.

	Ecc is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	Ecc is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with Ecc; if not, write to the Free Software Foundation, Inc.,
	59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
	
===========================================================================*/

//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop

#include "EccBrowseForDirectory.h"
#ifndef NO_WIN32_LEAN_AND_MEAN
	#error You need to define NO_WIN32_LEAN_AND_MEAN globally.
#endif
#include <shlobj.h> /* Needs global Conditional Define: NO_WIN32_LEAN_AND_MEAN */
//---------------------------------------------------------------------------

//===========================================================================
namespace ecc {
//===========================================================================

//---------------------------------------------------------------------------
/*	Internal function - do not call directly: */
int __stdcall EccBrowseCallbackProc(HWND hwnd, UINT uMsg, LPARAM lParam, LPARAM lpData);
//---------------------------------------------------------------------------
/*	Required to communicate with EccBrowseCallbackProc(): */
String EccSelectedDirectory;
//---------------------------------------------------------------------------

bool TBrowseForDirectory::Execute()
{
	// Make directory available for EccBrowseCallbackProc():
	EccSelectedDirectory = ExcludeTrailingBackslash(Directory);

	// Create and clear BROWSEINFO object:
	BROWSEINFO BrowsingInfo;
	memset(&BrowsingInfo, 0, sizeof(BROWSEINFO));
	char dir[MAX_PATH];

	BrowsingInfo.hwndOwner      = Handle;
	BrowsingInfo.pszDisplayName = dir;
	BrowsingInfo.ulFlags        = BIF_RETURNONLYFSDIRS;
	BrowsingInfo.lpszTitle      = Title.c_str();
	BrowsingInfo.lpfn           = EccBrowseCallbackProc;

	// Do the browsing:
	LPITEMIDLIST ItemID = SHBrowseForFolder(&BrowsingInfo);

	// Retrieve selected folder:
	if (ItemID)
	{
		char DirPath[MAX_PATH] = "";
		SHGetPathFromIDList(ItemID, DirPath);
		Directory = DirPath;
		return true;
	}
	else // Cancel is pressed:
	{
		Directory = "";
		return false;
	}
}
//---------------------------------------------------------------------------

int __stdcall EccBrowseCallbackProc(HWND hwnd, UINT uMsg, LPARAM lParam, LPARAM lpData)
{
// Sets initial directory for SHBrowseForFolder (in EccBrowseForDirectory).

	if (uMsg == BFFM_INITIALIZED)
	{
		if (!EccSelectedDirectory.IsEmpty())
		{
			SendMessage(hwnd, BFFM_SETSELECTION, true, (long)EccSelectedDirectory.c_str() );
		}
	}
	return 0;
}
//---------------------------------------------------------------------------

//===========================================================================
} // namespace ecc;
//===========================================================================