Question

我想为Windows 7制作一个程序，如果在C / C ++中有USB插入或USB移除，我会一直检查，我怎么能这样做？，你能给出一个示例代码吗？谢谢< / p>

Answer 1

Registering for Device Notification是示例设备通知示例。

RegisterDeviceNotification函数，用于注册以接收来自系统的通知消息。

Detecting Media Insertion or Removal 当添加新设备或媒体并且可用时，以及删除现有设备或媒体时，Windows会将WM_DEVICECHANGE消息发送到顶级窗口。

Answer 2

感谢大家，这是代码：

#define _WIN32_WINNT 0x0501
#include <windows.h>
#include <dbt.h>
#include <iostream>
#include <iomanip>
using namespace std;

#define USE_CDROM_GUID_ONLY



//-----------------------------------------------------------------------------

MSG msg;
void pupu(HWND hwnd);

LRESULT CALLBACK WinProc(HWND hwnd, UINT msg,WPARAM wParam, LPARAM lParam)
{
    if (msg == WM_DEVICECHANGE)
    {
        switch (wParam){
            case DBT_DEVICEARRIVAL:

                printf("new device connected \n");
                break;
            case DBT_DEVICEREMOVECOMPLETE:

                printf("a device has been removed \n");
                break;

        }

    }//if
    else
    cout << "Got msg " << msg << ", " << int(wParam)
    << ", " << int(lParam) << endl;
return 1;
}//WinProc

//-----------------------------------------------------------------------------
HWND pipi(){
    const char *className = "DevNotifyTest";

    WNDCLASSA wincl = { 0 };
    wincl.hInstance = GetModuleHandle(0);
    wincl.lpszClassName = className;
    wincl.lpfnWndProc = WinProc;



    HWND parent = 0;
#ifdef USE_MESSAGE_ONLY_WINDOW
    parent = HWND_MESSAGE;
#endif
    HWND hwnd = CreateWindowExA(WS_EX_TOPMOST, className, className,0, 0, 0, 0, 0,     parent, 0, 0, 0);


    GUID cdromDevIntGuid =
    { 0x53F56308, 0xB6BF, 0x11D0,
    { 0x94, 0xF2, 0x00, 0xA0, 0xC9, 0x1E, 0xFB, 0x8B } };

    DEV_BROADCAST_DEVICEINTERFACE_A notifyFilter = { 0 };
    notifyFilter.dbcc_size = sizeof(notifyFilter);
    notifyFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
    notifyFilter.dbcc_classguid = cdromDevIntGuid;

    HDEVNOTIFY hDevNotify =
        RegisterDeviceNotificationA(hwnd, &notifyFilter,
#ifndef USE_CDROM_GUID_ONLY
        DEVICE_NOTIFY_ALL_INTERFACE_CLASSES |
#endif
        DEVICE_NOTIFY_WINDOW_HANDLE);



    return hwnd;


}
void pupu(HWND hwnd){   

        BOOL bRet = PeekMessage(&msg, hwnd, 0, 0, PM_NOREMOVE);

        TranslateMessage(&msg);
        DispatchMessage(&msg);
        Sleep(1000);
}

int main()
{

    HWND hwnd = pipi();
    for (;;){
        pupu(hwnd);
        Sleep(1000);
    }

    return 0;
}//main

我如何检查在C / C ++中是否插入USB或USB

2 个答案: