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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