如何在C ++（Dev C ++编译器）中强制卸载库？

Question

I saw a Delphi (Object Pascal) code that force unloads any module (dll) that is loaded inside my software. Then with base in this code, I'm wanting and needing of something similar now in C++ (Dev C++).

Someone can help me please?

Here is Delphi code that I saw:

procedure ForceRemove(const ModuleName: string);
var
  hMod: HMODULE;
begin
  hMod := GetModuleHandle(PChar(ModuleName));
  if hMod=0 then 
    exit;
  repeat
  until not FreeLibrary(hMod);
end;

Answer 1

The functions

HMODULE GetModuleHandle(LPCTSTR modulename)
BOOL FreeLibrary(HMODULE)

are functions of the Windows API. It can be called from any language that supports programming against the Windows API, as C++

Only recommendation: Remove the loop (the repeat until not ...) in your sample above. It should be replaced by code that interprets the return value of the call to FreeLibrary, documentation here: https://msdn.microsoft.com/en-us/library/windows/desktop/ms683152(v=vs.85).aspx

The DLL will be unloaded from memory (that is to say, the address space of the executing process), as soon as its per-process reference count goes zero; you cannot force unloading a DLL globally by repeatedly executing FreeLibrary() if another process still holds a reference.

EDIT: included a direct translation of OP's sample into a C++ snippet:

void ForceRemove(LPCTSTR ModuleName)
{
    HMODULE hMod;
    hMod = ::GetModuleHandle(ModuleName);
    if(hMod==0) 
        return;
    /* DISCLAIMER potentially infinite loop
     * not advisable in production code,
     * included by request of the OP to
     * match his original */
    while(::FreeLibrary(hMod));
}