不了解com,高手指点一下

下面的函数是从网上copy的，
把zip文件解压，很管用。

现在的问题是，在解压的时候，会弹出一个正在复制的对话框。
要去掉这个对话框，修改哪里啊


bool UnZipFolder(LPCTSTR zipFile,LPCTSTR destination)
{

DWORD strlen = 0;
HRESULT hResult;
IShellDispatch *pISD;
Folder *pToFolder = NULL;
Folder *pFromFolder = NULL;
FolderItems *pFolderItems = NULL;
FolderItem *pItem = NULL;

VARIANT vDir, vFile, vOpt;
BSTR strptr1, strptr2;
CoInitialize(NULL);

bool bReturn = false;

hResult = CoCreateInstance(CLSID_Shell, NULL, CLSCTX_INPROC_SERVER,
IID_IShellDispatch, (void **)&pISD);

if(FAILED(hResult))
{
return bReturn;
}

VariantInit(&vOpt);
vOpt.vt = VT_I4;
vOpt.lVal = 16+4; // Do not display a progress dialog box ~ This will not work properly!


CString strZipFile(zipFile);
CString strDestination(destination);
strptr1 = strZipFile.AllocSysString();
strptr2 = strDestination.AllocSysString();

VariantInit(&vFile);
vFile.vt = VT_BSTR;
vFile.bstrVal = strptr1;
hResult = pISD->NameSpace(vFile, &pFromFolder);

VariantInit(&vDir);
vDir.vt = VT_BSTR;
vDir.bstrVal = strptr2;

hResult = pISD->NameSpace(vDir, &pToFolder);

if(S_OK == hResult)
{
hResult = pFromFolder->Items(&pFolderItems);
if(SUCCEEDED(hResult))
{
long lCount = 0;
pFolderItems->get_Count(&lCount);
IDispatch* pDispatch = NULL;
pFolderItems->QueryInterface(IID_IDispatch,(void**)&pDispatch);
VARIANT vtDispatch;
VariantInit(&vtDispatch);
vtDispatch.vt = VT_DISPATCH;
vtDispatch.pdispVal = pDispatch;

//cout << "Extracting files ...\n";
hResult = pToFolder->CopyHere(vtDispatch,vOpt);
if(hResult != S_OK) return false;


//Cross check and wait until all files are zipped!
FolderItems* pToFolderItems;
hResult = pToFolder->Items(&pToFolderItems);

if(S_OK == hResult)
{
long lCount2 = 0;

hResult = pToFolderItems->get_Count(&lCount2);
if(S_OK != hResult)
{
pFolderItems->Release();
pToFolderItems->Release();
SysFreeString(strptr1);
SysFreeString(strptr2);
pISD->Release();
CoUninitialize();
return false;
}
//Use this code in a loop if you want to cross-check the items unzipped.
/*if(lCount2 != lCount)
{
pFolderItems->Release();
pToFolderItems->Release();
SysFreeString(strptr1);
SysFreeString(strptr2);
pISD->Release();
CoUninitialize();
return false;
}*/

bReturn = true;
}

pFolderItems->Release();
pToFolderItems->Release();
}

pToFolder->Release();
pFromFolder->Release();
}

//cout << "Over!\n";
SysFreeString(strptr1);
SysFreeString(strptr2);
pISD->Release();

CoUninitialize();
return bReturn;
}