解压缩功能的实现--使用XZip与XUnzip

使用的XZip版本1.3  源程序可在Codeproject上获得，本教程实例代码下载

建立基于对话框的MFC程序（XZip是不依赖MFC）
添加XZip到项目，并添加头文件引用，至此可以使用XZip。
          


在编译的时候，若有报错如下：


对XUnzip.cpp与XZip不适用预编译头



重新编译，无报错。

几个常用函数简介：

CreateZip()--创建压缩文件。

<pre class="cpp" name="code">HZIP CreateZip(void *z,
unsigned int len,
DWORD flags);

// Purpose:     Create a zip archive file//// Parameters:  z      - archive file name if flags is ZIP_FILENAME;  for other//                       uses see below//              len    - for memory (ZIP_MEMORY) should be the buffer size;//                      
for other uses, should be 0//              flags  - indicates usage, see below;  for files, this will be//                       ZIP_FILENAME//// Returns:     HZIP   - non-zero if zip archive created ok, otherwise 0

调用CreateZip来创建一个压缩文件，在创建压缩文件的时候，根据flags来判断文件存储位置

管道中：CreateZip(hpip_write,0,ZIP_HANDLE);

文件中（根据文件句柄）：CreateZip(hfile, 0,ZIP_HANDLE);

文件中（文件路径):CreateZip("c:\\test.zip", 0,ZIP_FILENAME);

内存中：CreateZip(buf, len,ZIP_MEMORY);

页面文件：CreateZip(0, len,ZIP_MEMORY);

ZipAdd()--在压缩文件中添加文件

ZRESULT ZipAdd(HZIP hz,
const TCHAR *dstzn,
void *src,
unsigned int len,
DWORD flags);

// ZipAdd()

//

// Purpose:     Add a file to a zip archive

//

// Parameters:  hz      - handle to an open zip archive

//              dstzn   - name used inside the zip archive to identify the file

//              src     - for a file (ZIP_FILENAME) this specifies the filename

//                        to be added to the archive;  for other uses, see below

//              len     - for memory (ZIP_MEMORY) this specifies the buffer

//                        length;  for other uses, this should be 0

//              flags   - indicates usage, see below;  for files, this will be

//                        ZIP_FILENAME

//

// Returns:     ZRESULT - ZR_OK if success, otherwise some other value

每一个需要添加进hz的文件都需要调用ZipAdd();

dstzn存在hz中的文件的名字。被加到hz中的文件可以从管道中来：ZipAdd(hz,"file.dat", hpipe_read,0,ZIP_HANDLE);

从文件（文件句柄）中来： ZipAdd(hz,"file.dat", hfile,0,ZIP_HANDLE);

从文件（路径）中来：ZipAdd(hz,"file.dat", "c:\\docs\\origfile.dat",0,ZIP_FILENAME);

从内存中来： ZipAdd(hz,"subdir\\file.dat", buf,len,ZIP_MEMORY);

或者添加文件夹：ZipAdd(hz,"subdir",   0,0,ZIP_FOLDER);

打开zip文件--OpenZip()

HZIP OpenZip(void *z, unsigned int len, DWORD flags);

// OpenZip()

//

// Purpose:     Open an existing zip archive file

//

// Parameters:  z      - archive file name if flags is ZIP_FILENAME;  for other

//                       uses see below

//              len    - for memory (ZIP_MEMORY) should be the buffer size;

//                       for other uses, should be 0

//              flags  - indicates usage, see below;  for files, this will be

//                       ZIP_FILENAME

//

// Returns:     HZIP   - non-zero if zip archive opened ok, otherwise 0

// OpenZip - opens a zip file and returns a handle with which you can

// subsequently examine its contents. You can open a zip file from:

// from a pipe:             OpenZip(hpipe_read,0, ZIP_HANDLE);

// from a file (by handle): OpenZip(hfile,0,      ZIP_HANDLE);

// from a file (by name):   OpenZip("c:\\test.zip",0, ZIP_FILENAME);

// from a memory block:     OpenZip(bufstart, buflen, ZIP_MEMORY);

// If the file is opened through a pipe, then items may only be

// accessed in increasing order, and an item may only be unzipped once,

// although GetZipItem can be called immediately before and after unzipping

// it. If it's opened i n any other way, then full random access is possible.

// Note: pipe input is not yet implemented.

GetZipItem() - Get information about an item in an open zip archive.

//////////////////////////////////////////////////////////////////////////////
//
// GetZipItem()
//
// Purpose:     Get information about an item in an open zip archive
//
// Parameters:  hz      - handle of open zip archive
//              index   - index number (0 based) of item in zip
//              ze      - pointer to a ZIPENTRY (if ANSI) or ZIPENTRYW struct
//                        (if Unicode)
//
// Returns:     ZRESULT - ZR_OK if success, otherwise some other value
//

FindZipItem() - Find item by name and return information about it.

//////////////////////////////////////////////////////////////////////////////
//
// FindZipItem()
//
// Purpose:     Find item by name and return information about it
//
// Parameters:  hz      - handle of open zip archive
//              name    - name of file to look for inside zip archive
//              ic      - TRUE = case insensitive
//              index   - pointer to index number returned, or -1
//              ze      - pointer to a ZIPENTRY (if ANSI) or ZIPENTRYW struct
//                        (if Unicode)
//
// Returns:     ZRESULT - ZR_OK if success, otherwise some other value
//

UnzipItem() - Find item by index and unzip it.

//////////////////////////////////////////////////////////////////////////////
//
// UnzipItem()
//
// Purpose:     Find item by index and unzip it
//
// Parameters:  hz      - handle of open zip archive
//              index   - index number of file to unzip
//              dst     - target file name of unzipped file
//              len     - for memory (ZIP_MEMORY. length of buffer;
//                        otherwise 0
//              flags   - indicates usage, see below;  for files, this will be
//                        ZIP_FILENAME
//
// Returns:     ZRESULT - ZR_OK if success, otherwise some other value
//

关闭zip文件--CloseZip();

ZRESULT CloseZip(HZIP hz);

在实例中，演示压缩指定文件夹里的所有文件。

简易界面：



添加文件代码：

void CXzippppDlg::OnBnClickedBtnAddpath()
{
// TODO: 在此添加控件通知处理程序代码
TCHAR szPath[MAX_PATH];     //存放选择的目录路径
m_edit_show=_T("");
ZeroMemory(szPath, sizeof(szPath));
BROWSEINFO bi;
bi.hwndOwner = m_hWnd;
bi.pidlRoot = NULL;
bi.pszDisplayName = szPath;
bi.lpszTitle = L"选择需要添加的文件目录";
bi.ulFlags = 0;
bi.lpfn = NULL;
bi.lParam = 0;
bi.iImage = 0;
//弹出选择目录对话框
LPITEMIDLIST lp = SHBrowseForFolder(&bi);
if(lp && SHGetPathFromIDList(lp, szPath))
{
m_edit_show.Format(L"已选择目录 %s",  szPath);
m_strPath=szPath;
}
else
AfxMessageBox(L"无效的目录，请重新选择");
UpdateData(FALSE);
}

压缩文件代码：

oid CXzippppDlg::OnBnClickedBtnZip()
{
// TODO: 在此添加控件通知处理程序代码
if (m_strPath==_T(""))
{
AfxMessageBox(L"请选择有效的路径");
return;
}
//1.创建zip
HZIP hz=CreateZip(L"C:\\test.zip",0,ZIP_FILENAME);//
//2.添加文件
if (hz)
{
//ZipAdd(hz,m_strPath,0,0,ZIP_FOLDER);
//遍历路径下所有文件和文件夹。
ZipAllFile(m_strPath,hz);
}
CloseZip(hz);
}

void CXzippppDlg::ZipAllFile(CString strDir,HZIP hz)

{//可以在线程中实现，不然压缩大文件时，主程序要等待
if(strDir == _T(""))
return;
else
{
if(strDir.Right(1) != _T("\\"))
strDir += L"\\";
strDir =strDir+_T("*.*");
}
CFileFind finder;
CString strPath;
BOOL bWorking = finder.FindFile(strDir);
while(bWorking)
{
bWorking = finder.FindNextFile();
strPath = finder.GetFilePath();
if(finder.IsDirectory() && !finder.IsDots())
{
// CString pathname=strPath.Mid(strPath.ReverseFind('\\')+1);
//ZipAdd(hz,pathname,0,0,ZIP_FOLDER);
ZipAllFile(strPath,hz); //递归调用
}
else if(!finder.IsDirectory() && !finder.IsDots())
{
//strPah就是所要获取的文件路径
CString filename=strPath.Mid(strPath.ReverseFind('\\')+1);
ZipAdd(hz, filename, strPath.GetBuffer(), 0, ZIP_FILENAME);
}
}

}

压缩功能做好后，还有解压功能暂时没做。