Where does pip install packages?
You may wonder which directory pip installs a package to. For example, pip install pymupdf Where does pip install the package pymupdf? Suppose your python is installed in C:\Python. You […]
order, strict partial order, non-strict partial order, strict total order, non-strict total order
An order is a relation R that satisfies transitivity. i.e., such that if aRb and bRc, then aRc. A strict partial order is a relation < on S that satisfies […]
What is a representable relation in logic?
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Qt console application does not show cmd window in Qt Creator
If you create a Qt console application in Qt creator, and debug it in Qt Creator, you’ll find no cmd window is displayed. You check the .pro file and find […]
cannot load firefox extension
I wrote a simple firefox extension: only one content script which has only one line of code: console.log(“hello world”); I was confident it was all right. Then, I typed “about:debugging” […]
What is a valid formula in logic?
A formula is valid iff it is true for all models and all variable assignments. Or, a formula is valid iff it is true in all structures(structure=model, which is a […]
ReadFile
The return value of ReadFile is of BOOL type, which means the return value only indicates whether the function succeeds or fails. If the function fails, the return value does […]
Buggy RegSetValueEx
The prototype of RegSetValueExA is: LSTATUS RegSetValueExA(HKEY hKey,LPCSTR lpValueName,DWORD Reserved,DWORD dwType,const BYTE *lpData,DWORD cbData); lpData points to the data to be stored in registry. cbData is the number of first […]
QString
Today, we’ll talk about the “simplest” class of Qt, a class we use every day, a class we often do need to care about the details – QString. Despite the […]
What functions are exported when build dll using Mingw gcc?
If you build a dll using Mingw g++ like: g++ -shared -o myprogrammingnotes.dll myprogrammingnotes.cpp If __declspec(dllexport) is not present in the source file, all functions except the entry point function(DllMain) […]