unzipfile.c

是一个C语言的压缩和解压缩的DLL源程序.

#include <windows.h>
#include <tchar.h>
#include "../LiteUnzip.h"





// Where we store the pointers to LiteUnzip.dll's functions that we call
UnzipOpenFilePtr		*lpUnzipOpenFile;
UnzipGetItemPtr			*lpUnzipGetItem;
UnzipItemToFilePtr		*lpUnzipItemToFile;
UnzipClosePtr			*lpUnzipClose;
UnzipFormatMessagePtr	*lpUnzipFormatMessage;





/*********************** show_errmsg() **********************
 * Displays a messagebox for the passed OS error number.
 */

void show_errmsg(void)
{
	TCHAR buffer[160];

	buffer[0] = 0;
	FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, 0, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), &buffer[0], 160, 0);
	MessageBox(0, &buffer[0], _T("Error"), MB_OK);
}





/************************** main() *************************
 * Program entry point.
 */

int main()
{
	HMODULE		unzipDll;
	HUNZIP		huz;
	DWORD		result;

	// Open the LiteUnzip.DLL. Note: If LiteUnzip.dll is not placed in a path that can be found
	// by this app, then LoadLibrary will fail. So, either copy LiteUnzip.dll to the same
	// directory as this EXE, or to some directory that Windows is set to search.
	if ((unzipDll = (HMODULE)LoadLibrary(_T("../LiteUnzip.dll"))))
	{
		// Get the addresses of 5 functions in LiteUnzip.dll -- UnzipOpenFile(), UnzipGetItem()
		// UnzipItemToFile(), UnzipClose(), and UnzipFormatMessage.
		lpUnzipOpenFile = (UnzipOpenFilePtr *)GetProcAddress(unzipDll, UNZIPOPENFILENAME);
		lpUnzipGetItem = (UnzipGetItemPtr *)GetProcAddress(unzipDll, UNZIPGETITEMNAME);
		lpUnzipItemToFile = (UnzipItemToFilePtr *)GetProcAddress(unzipDll, UNZIPITEMTOFILENAME);
		lpUnzipClose = (UnzipClosePtr *)GetProcAddress(unzipDll, UNZIPCLOSENAME);
		lpUnzipFormatMessage = (UnzipFormatMessagePtr *)GetProcAddress(unzipDll, UNZIPFORMATMESSAGENAME);

		// Open a ZIP archive on disk named "test.zip".
		if (!(result = lpUnzipOpenFile(&huz, _T("test.zip"), 0)))
		{
			ZIPENTRY	ze;
			DWORD		numitems;

			// Find out how many items are in the archive.
			ze.Index = (DWORD)-1;
			if ((result = lpUnzipGetItem(huz, &ze))) goto bad2;
			numitems = ze.Index;

			// Unzip each item, using the name stored (in the zip) for that item.
			for (ze.Index = 0; ze.Index < numitems; ze.Index++)
			{
				if ((result = lpUnzipGetItem(huz, &ze)) || (result = lpUnzipItemToFile(huz, ze.Name, &ze)))
				{
bad2:				lpUnzipClose(huz);
					goto bad;
				}
			}

			// Done unzipping files, so close the ZIP archive.
			lpUnzipClose(huz);
		}
		else
		{
			TCHAR	msg[100];

bad:		lpUnzipFormatMessage(result, msg, sizeof(msg));
			MessageBox(0, &msg[0], _T("Error"), MB_OK);
		}

		// Free the LiteUnzip.DLL
		FreeLibrary(unzipDll);
	}
	else
		show_errmsg();

	return(0);
}