列出系统中安装的光盘驱动器的步骤

/*
* enum-cdrom.c - 列出系统中的光盘驱动器
*
* 作者: xstring@csdn
* 日期: 2004.04.16
*
* 说明:
* 使用GetLogicalDrives也可以列出系统中的光驱, 但无法知道其接口
* 性质; 而且无法列出没有分配盘符的光驱。
* 如果你要得到每个光驱的更多硬件信息, 请自己查看程序中所涉及到
* 的注册表位置。
*/

#define _WIN32_WINNT 0x400
#define STRICT

#include <stdio.h>
#include <tchar.h>
#include <locale.h>
#include <windows.h>

#pragma comment (lib, "advapi32.lib")
#pragma comment (lib, "user32.lib")

void print_msg (LPCTSTR api, DWORD error)
{
LPTSTR str = NULL;
FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
NULL, error, 0, (LPTSTR)&str, 0, 0);
_tprintf (TEXT ("%s 调用失败，错误代码: %u/n %s/n"),
api, error, str);
LocalFree (str);
};

#define CHECK_ERROR(apiname) /
if (error != ERROR_SUCCESS) /
{ /
api = TEXT (apiname); /
goto failed; /
}


int main (void)
{
HKEY keyServ = NULL;
HKEY keyEnum = NULL;
HKEY key = NULL;
DWORD error = 0;
LPCTSTR api = NULL;
DWORD type, count, size, i;

setlocale (LC_ALL, ".ACP");

error = RegOpenKeyEx (HKEY_LOCAL_MACHINE,
TEXT ("SYSTEM//CurrentControlSet//Services//Cdrom//Enum"),
0, KEY_READ, &keyServ);

CHECK_ERROR ("RegOpenKeyEx");

error = RegOpenKeyEx (HKEY_LOCAL_MACHINE,
TEXT ("SYSTEM//CurrentControlSet//Enum"),
0, KEY_READ, &keyEnum);

CHECK_ERROR ("RegOpenKeyEx");

size = sizeof (count);
error = RegQueryValueEx (keyServ, TEXT ("Count"),
0, &type, (LPBYTE)&count, &size);

CHECK_ERROR ("RegQueryValueEx");

_tprintf (TEXT ("您的系统上共有 %u 个光盘驱动器: /n/n"), count);

for (i=0;i<count;++i)
{
TCHAR sz [0x200];
TCHAR name [0x40];
static TCHAR dtname [] [16] =
{ TEXT ("USB"), TEXT("IDE"), TEXT ("SCSI"), TEXT ("Unknown") };
int dt;

wsprintf (name, TEXT ("%d"), i);
size = sizeof (sz);
error = RegQueryValueEx (keyServ, name,
0, &type, (LPBYTE)sz, &size);

CHECK_ERROR ("RegQueryValueEx");

error = RegOpenKeyEx (keyEnum, sz,
0, KEY_READ, &key);

CHECK_ERROR ("RegOpenKeyEx");

for (dt=0;dt<3;++dt)
{
if (_tcsncmp (sz, dtname [dt], _tcslen(dtname [dt])) == 0)
break;
}

size = sizeof (sz);
error = RegQueryValueEx (key, TEXT ("FriendlyName"),
0, &type, (LPBYTE)sz, &size);

CHECK_ERROR ("RegQueryValueEx");

_tprintf (TEXT (" CDROM %d - %s [%s]/n"),
i, sz, dtname [dt]);
RegCloseKey (key);
key = NULL;
};

RegCloseKey (keyEnum);
RegCloseKey (keyServ);
return 0;

failed:
if (keyServ)
RegCloseKey (keyServ);
if (keyEnum)
RegCloseKey (keyEnum);
if (key)
RegCloseKey (key);
print_msg (api, error);
return error;
};

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