c++ - 使用 Win32 C++ 查找 CD ROM 驱动器在您的哪个驱动器上

Question

我在我的 Win32 C++ 应用程序上创建了一个“弹出”按钮，当我按下它时，它会打开 CD ROM 托盘。现在我已经硬编码了，知道我电脑上的 D 驱动器是 CD ROM 驱动器。我的问题是，如果我不知道光驱是哪个驱动器，或者在光驱不是D盘的计算机上，如何确定光驱是我计算机上的哪个驱动器并打开光盘托盘？我的代码如下所示。

#include <windows.h>
#include <stdlib.h>
#include <string.h>
#include <tchar.h>
#include <stdio.h>

#define IDC_BUTTON                  3456

static TCHAR szWindowClass[] = _T("CD_ROM_READER_APP");
static TCHAR szTitle[] = _T("CD Rom Reader App");
HINSTANCE hInst;

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

TCHAR CSCI_NO[60];
HWND TextBox;

DWORD dwBytes;
HANDLE hCdRom = CreateFile(_T("\\\\.\\D:"),     //This is where I set it so that the D drive is the drive ejected
    GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    PAINTSTRUCT ps;
    HDC hdc;
    TCHAR heading[] = _T("CD ROM READER");
    TCHAR CSCI_No_Inst[] = _T("Please enter the CSCI No below:");

    switch (message)
    {
    case WM_CREATE:
    {
        HWND hwndButton = CreateWindow(
            L"BUTTON", L"EJECT",   
            WS_TABSTOP | WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,  
            150, 200, 100, 100,        
            hWnd, (HMENU)IDC_BUTTON, (HINSTANCE)GetWindowLongPtr(hWnd, GWLP_HINSTANCE), NULL);      
       return 0;
    }
    case WM_COMMAND:
    {
        switch (LOWORD(wParam))
        {
        case IDC_BUTTON:
            //Open CD Rom Tray when the Eject button is pressed
            if (hCdRom == INVALID_HANDLE_VALUE)
            {
                _tprintf(_T("Error: %x"), GetLastError());
                return 1;
            }
            // Open the door:  
            DeviceIoControl(hCdRom, IOCTL_STORAGE_EJECT_MEDIA, NULL, 0, NULL, 0, &dwBytes, NULL);
            MessageBox(NULL, L"Please insert a CD ROM in the CD tray.", L"CD ROM Drive", 0);
            break;
        }
    }
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
        break;
    }
    return 0;
}

Answer 1

how can I determine which drive on my computer the CD Rom drive is

The following is an example based on @RemyLebeau's comment you can refer to:

WCHAR buf[BUF_SIZE];
LPWSTR pBuf = buf;
DWORD chrCopied = GetLogicalDriveStrings(BUF_SIZE - 1, buf);
while (chrCopied)
{
    if (DRIVE_CDROM == GetDriveType(pBuf))
    {
        MessageBox(NULL, pBuf, L"CD-ROM drive", 0);
    }
    size_t len = _tcslen(buf);
    chrCopied -= len + 1;
    pBuf += len + 1;
}

结果如下：