Detection usb avec WM_DEVICECHANGE

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// Code par KarLKoX
#include <windows.h>
#include <stdio.h>

#ifndef WM_DEVICECHANGE
#define WM_DEVICECHANGE 0x219
#endif

#ifndef DBT_DEVICEARRIVAL
#define DBT_DEVICEARRIVAL 0x8000
#endif

#ifndef DBT_DEVICEREMOVECOMPLETE
#define DBT_DEVICEREMOVECOMPLETE 0x8004
#endif

#ifndef DBT_DEVTYP_VOLUME
#define DBT_DEVTYP_VOLUME 0x2
#endif

/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

/* Make the class name into a global variable */
char szClassName[ ] = "WindowsApp";

// structure générique
struct DEV_BROADCAST_HDR
{
int dbch_size;
int dbch_devicetype;
int dbch_reserved;
};

// structure spécifique
// notez qu'elle a strictement le même tronche que la générique mais
// avec des trucs en plus
struct DEV_BROADCAST_VOLUME
{
int dbcv_size;
int dbcv_devicetype;
int dbcv_reserved;
int dbcv_unitmask;
short dbcv_flags;
};

int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nFunsterStil)

{
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */

/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = CS_DBLCLKS; /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);

/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Use Windows's default color as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;

/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0;

/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
"Windows App", /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
544, /* The programs width */
375, /* and height in pixels */
HWND_DESKTOP, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);

/* Make the window visible on the screen */
ShowWindow (hwnd, nFunsterStil);

/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}

/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}

/* This function is called by the Windows function DispatchMessage() */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
// Bonus :)
case WM_DEVICECHANGE:
if (wParam == DBT_DEVICEARRIVAL)
MessageBox(hwnd, "Une clé USB vient d'être connectée.", "Info", MB_OK);
else if (wParam == DBT_DEVICEREMOVECOMPLETE)
MessageBox(hwnd, "Une clé USB vient d'être déconnectée.", "Info", MB_OK);
break;

case WM_ENDSESSION:
MessageBox(hwnd, "Windows va se fermer.", "Info", MB_OK);
return 0;

case WM_DESTROY:
PostQuitMessage (0); // send a WM_QUIT to the message queue
break;

default: // for messages that we don't deal with
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;
}

Oui, c'est une FAQ Win32 (depuis les années 90 !) chez les pros
https://www.ovh.co.uk/mail/