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我一直在寻找一种将文件压缩在一起以便通过web服务发送的方法,然后在收到它们后提取它们。我找到了我在这里显示的代码http://www.codeproject.com/Articles/280650/Zip-Unzip-using-Windows-Shell。为把一个文件到压缩文件夹中的代码工作正常,这就是:使用COM从C++中的zip文件中提取文件
BSTR source = L"C:\\Users\\...\\Desktop\\test1.txt\0\0";
BSTR dest = L"C:\\Users\\...\\Desktop\\test.zip\\\0\0";
HRESULT hResult;
IShellDispatch *pISD;
Folder *pToFolder = NULL;
VARIANT vDir, vFile, vOpt;
CoInitialize(NULL);
hResult = CoCreateInstance
(CLSID_Shell, NULL, CLSCTX_INPROC_SERVER, IID_IShellDispatch, (void **)&pISD);
if (SUCCEEDED(hResult))
{
VariantInit(&vDir);
vDir.vt = VT_BSTR;
vDir.bstrVal = dest;
// Destination is our zip file
hResult = pISD->NameSpace(vDir, &pToFolder);
if (SUCCEEDED(hResult))
{
// Now copy source file(s) to the zip
VariantInit(&vFile);
vFile.vt = VT_BSTR;
vFile.bstrVal = source;
VariantInit(&vOpt);
vOpt.vt = VT_I4;
vOpt.lVal = FOF_NO_UI;
// Copying and compressing the source files to our zip
hResult = pToFolder->CopyHere(vFile, vOpt);
Sleep(1000);
pToFolder->Release();
}
pISD->Release();
}
CoUninitialize();
从zip文件中提取文件中的代码不,这是这样的:
BSTR source = L"C:\\Users\\...\\Desktop\\test1.zip\\\0\0";
BSTR dest = L"C:\\Users\\...\\Desktop\\unzipto\\\0\0";
HRESULT hResult;
IShellDispatch *pISD;
Folder *pToFolder = NULL;
VARIANT vDir, vFile, vOpt;
CoInitialize(NULL);
hResult = CoCreateInstance
(CLSID_Shell, NULL, CLSCTX_INPROC_SERVER, IID_IShellDispatch, (void **)&pISD);
if (SUCCEEDED(hResult))
{
VariantInit(&vDir);
vDir.vt = VT_BSTR;
vDir.bstrVal = dest;
// Destination is our zip file
hResult = pISD->NameSpace(vDir, &pToFolder);
if (SUCCEEDED(hResult))
{
Folder *pFromFolder = NULL;
VariantInit(&vFile);
vFile.vt = VT_BSTR;
vFile.bstrVal = source;
pISD->NameSpace(vFile, &pFromFolder);
FolderItems *fi = NULL;
pFromFolder->Items(&fi); //----Fails Here!-----
VariantInit(&vOpt);
vOpt.vt = VT_I4;
vOpt.lVal = FOF_NO_UI; // Do not display a progress dialog box
// Creating a new Variant with pointer to FolderItems to be copied
VARIANT newV;
VariantInit(&newV);
newV.vt = VT_DISPATCH;
newV.pdispVal = fi;
hResult = pToFolder->CopyHere(newV, vOpt);
Sleep(1000);
pFromFolder->Release();
pToFolder->Release();
}
pISD->Release();
}
CoUninitialize();
程序失败在pFromFolder->Items(&fi);
。
运行程序之前,目标文件夹“unzipto”已存在。还试图找到“文件夹”变量上的任何内容都非常棘手,因为谷歌带回了一切,但我正在寻找。
有没有人可以对此有所了解,甚至可以告诉我为什么会发生这种情况?
10年前我对COM有更多的了解......但我认为你设置BSTR值的方式看起来有点不合适。但是,然后......当我做COM和_bstr_t类型时,我使用了ATL ...... – BitTickler
它们以什么方式向外看? @BitTickler – Sconz2
https://msdn.microsoft.com/en-us/library/windows/desktop/ms221069(v=vs.85).aspx << - 不仅0终止,而且长度正常前缀。 – BitTickler