COM Apartment
When a thread calls CoInitialize(NULL) or CoInitializeEx(NULL,COINIT_APARTMENTTHREADED), it creates a new STA apartment. The creating thread is said to be in the apartment. When the thread later instantiates a COM […]
The first function called in a COM dll when instantiating the COM object
When a program calls the COM lib function CoCreateInstance, what will happen? What work does CoCreateInstance do? How does CoCreateInstance work? The function has a parameter classid. The function looks […]
PE file format
Unlike science, technique is easy to be followed, cracked, hacked, copied, plagiarized, stolen, even surpassed by others so it need some barriers. Why are there so many evil words associated […]
When is DllMain called?
I hear the DllMain function is called when the process loads the needed dll at the start time, so I write the following code to verify this: //mydll.cpp #include <windows.h> […]
How to instantiate a COM object using Qt?
Suppose you have a myprogrammingnotes.dll that contains a COM object. You want to instantiate and use that COM object in your Qt app. How to do that? If myprogrammingnotes.dll contains […]
What entries are created in registry when registering an in-proc COM server dll?
When running “regsvr32 some.dll”, what keys/names/values are added in the registry?(note that regsvr32 can register both 32bit dll and 64 bit dll on 64bit Windows) Computer\HKEY_CLASSES_ROOT\yourapp.YOURCLASSBinder\ CLSID CurVer Computer\HKEY_CLASSES_ROOT\yourapp.YOURCLASSBinder.1\ CLSID […]
How does QSslSocket::supportsSsl know if it supports ssl or not?
You must know how to use QSslSocket::supportsSsl in your app to check if your Qt lib supports ssl. How does QSslSocket::supportsSsl decide if it supports ssl or not? The function […]
How to tell if a lib is a static lib or a dynamic lib?
A lib file name typically ends with .a or .lib. A .a suffix lib is a static lib but a .lib suffix lib is either a static lib or an […]
C++ const function
What is a const function? Const functions are defined like int fun() const But only a member function can be const, i.e., there is no concept of const function outside […]
How to know the type of a variable in C++?
To check the type of a variable in C++, you can use typeid(variable).name(), for example #include <typeinfo> … … int b=9; char c=’a’; char * p=&c; int *d; printf(“%s\n”,typeid(b).name()); printf(“%s\n”,typeid(c).name()); […]