使用 c++ 代码获取活动目录图片

Question

I am working on a java web application with active directory using JNI interface. i want to get the active directory users picture and found that the picture is stored as a octet string. I used IADsUser to get the value of the picture but i cant find any documentation or code how to use that value. I want to send this data through jni to java where i can render the picture. Code i used to get the picture.

HRESULT GetUserObject()
{
    IADsUser* pUser;
    CoInitialize(NULL);
    CComBSTR  path = L"LDAP://WIN-F94H2MP3UJR.Test.local/CN=SomeOne";
    path += L",CN=Users,DC=Test,DC=local";
    HRESULT hr = ADsOpenObject(path, L"Administrator", L"pass@12",
        ADS_SECURE_AUTHENTICATION, // For secure authentication
        IID_IADsUser,
        (void**)&pUser);
    if (FAILED(hr)) { return NULL; }
    VARIANT var;
    hr = pUser->get_Picture((VARIANT*)&var);
    std::string message = std::system_category().message(hr);
    std::cout << message << std::endl;
    return hr;
}

Microsoft documentation i used to code this Link . In this documentation they specified Get picture method which is what am looking for. Here as the hr prints operation completed successfully. Help me how to work with this value or atleast help me to print the value stored in var in c++. Thank you.

Answer 1

I had an old C++ project where I was already getting data from AD, so I decided to try this out. This is what I came up with to get the data into a byte array and write it to a file:

VariantInit(&var);
LONG lBound = 0;
LONG uBound = 0;

if (FAILED(pUser->get_Picture(&var)) ||
    FAILED(SafeArrayLock(var.parray)) ||
    FAILED(SafeArrayGetLBound(var.parray, 1, &lBound)) ||
    FAILED(SafeArrayGetUBound(var.parray, 1, &uBound))) {
    //handle failure
}

if (var.vt != VT_EMPTY) {
    const char* pData = static_cast<const char*>(var.parray->pvData);

    std::ofstream file("picture.jpg", std::ios::binary);
    file.write(pData, uBound);
    file.close();

    SafeArrayUnlock(var.parray);
}
VariantClear(&var);

The vt property will be VT_EMPTY if there is no picture, and VT_ARRAY | VT_UI1 VT_ARRAY | VT_UI1 if it does. The data is a SAFEARRAY . You need to use SafeArrayGetLBound and SafeArrayGetUBound to get the lower bound (probably always 0 ) and the upper bound (length).