Voici le code minimaliste de detection/retrait d'un peripherique USB
le .cpp
le .h
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29 //--------------------------------------------------------------------------- #include <vcl.h> #pragma hdrstop #include "Unit1.h" //--------------------------------------------------------------------------- #pragma package(smart_init) #pragma resource "*.dfm" #define DBT_DEVICEARRIVAL 0x8000 // le systeme a detecte un nouveau device #define DBT_DEVICEREMOVECOMPLETE 0x8004 // device est completement desactive TForm1 *Form1; //--------------------------------------------------------------------------- __fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner) { } //--------------------------------------------------------------------------- void __fastcall TForm1::GetDeviceChange(TMessage &Msg) { switch (Msg.WParam) { case DBT_DEVICEARRIVAL: ShowMessage("Peripherique USB connecte"); break; case DBT_DEVICEREMOVECOMPLETE: ShowMessage("Peripherique USB deconnecte"); break; } }
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25 //--------------------------------------------------------------------------- #ifndef Unit1H #define Unit1H //--------------------------------------------------------------------------- #include <Classes.hpp> #include <Controls.hpp> #include <StdCtrls.hpp> #include <Forms.hpp> //--------------------------------------------------------------------------- class TForm1 : public TForm { __published: // IDE-managed Components private: // User declarations public: // User declarations __fastcall TForm1(TComponent* Owner); void __fastcall TForm1::GetDeviceChange(TMessage &Msg); BEGIN_MESSAGE_MAP MESSAGE_HANDLER(WM_DEVICECHANGE,TMessage,GetDeviceChange) END_MESSAGE_MAP(TForm) }; //--------------------------------------------------------------------------- extern PACKAGE TForm1 *Form1; //--------------------------------------------------------------------------- #endif
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