Question

我需要包含一个＆＃34;否则回音没有USB检测＆＃34;进入这个.bat（不添加＆＃34;如果%% l NEQ 2＆＃34;）

for /F "usebackq tokens=1,2,3,4 " %%i in (`wmic logicaldisk get caption^,description^,drivetype 2^>NUL`) do (
if %%l equ 2 (
echo USB detect in %%i
        )
        )

简单来说：如果检测到USB，那么＆＃34;回显OK＆＃34;。但是如果它没有检测到USB，那么＆＃34;回声No＆＃34;并退出。感谢

解决 Tim

重要提示：

在我看来，这个脚本（由Stephan）检测驱动器要高得多

@echo off
setlocal enabledelayedexpansion
REM get removable loaded drives:
for /f %%a in ('"wmic logicaldisk where (drivetype=2 and size is not null) get caption,size 2>nul|find ":""') do set usb=!usb! %%a
REM show a overview:
if defined usb (echo removable drives found in: %usb%) else echo no removable drive found
REM show them one-by-one:
for %%a in (%usb%) do echo removable drive found in %%a

Answer 1

wmic比你想象的更有力量：

@echo off
setlocal enabledelayedexpansion
REM get removable loaded drives:
for /f %%a in ('"wmic logicaldisk where (drivetype=2 and size is not null) get caption,size 2>nul|find ":""') do set usb=!usb! %%a
REM show a overview:
if defined usb (echo removable drives found in: %usb%) else echo no removable drive found
REM show them one-by-one:
for %%a in (%usb%) do echo removable drive found in %%a

Answer 2

此代码适用于我。将其保存到 test.bat 并从打开的Cmd提示符运行。它只打印磁盘相关信息，没有垃圾：

@echo off
setlocal enabledelayedexpansion
for /F "usebackq tokens=* skip=1" %%i in (`wmic logicaldisk get caption^,description^,drivetype 2^>NUL`) do (set "dsk=%%i"
    if "!dsk:~-12,1!" equ "2" (echo USB disk detected in !dsk:~0,2!
    ) else if "!dsk:~-12,1!" gtr "2" (echo No USB disk detected in !dsk:~0,2!) )
exit /b

Answer 3

您的问题是在ELSE声明中添加了IF条款。我建议在两个右括号之间添加ELSE。这段代码正是如此：

@echo off
for /F "usebackq tokens=1,2,3,4 " %%i in (`wmic logicaldisk get caption^,description^,drivetype 2^>NUL`) do (
  if %%l equ 2 (echo USB detect in %%i) ELSE (echo No USB Detect)
)

这是我的输出没有插入USB驱动器：

C:\Users\tim\Documents\Scripting Tools>usbdetect.bat
No USB Detect
No USB Detect
No USB Detect

这是插入了thumbdrive的输出：

C:\Users\tim\Documents\Scripting Tools>usbdetect.bat
No USB Detect
No USB Detect
USB detect in D:
No USB Detect

以下是我使用的WMIC命令的结果：

C:\Users\tim\Documents\Scripting Tools>wmic logicaldisk get caption,description,drivetype
Caption  Description       DriveType
C:       Local Fixed Disk  3
D:       Removable Disk    2

您可能会注意到它没有USB检测3次。这是正确的，因为您构造的FOR循环遍历每行输出。 WMIC使用标题（Caption，Description和DriveType）分配一行，每个驱动器一行（而C：不是DriveType 2），然后是一个空行。

你的最后一行，In simple words: if USB detected, then "echo OK". But if it does not detect the USB, then "echo No" and exit.似乎暗示你只需要一个简单的已安装/未安装，而不是来自WMIC查询的每行输出的是/否。如果是这种情况，您就不需要（或想要）ELSE。试试这个：

@echo off
for /F "usebackq tokens=1,2,3,4 " %%i in (`wmic logicaldisk get caption^,description^,drivetype 2^>NUL`) do (
  if %%l equ 2 (
    echo USB detect in %%i
    goto RestOfBatch
  )
)
echo USB not detected
:RestOfBatch

没有插入USB驱动器：

C:\Users\tim\Documents\Scripting Tools>usbdetect.bat
USB not detected

插入USB驱动器：

C:\Users\tim\Documents\Scripting Tools>usbdetect.bat
USB detect in D:

如果这些都不能产生预期结果，请更清楚地定义您的问题。 http://ss64.com/nt/有一个完整的批处理命令列表及其语法。您还可以在命令末尾添加/?以获取示例。 EG：IF /?

否则进入循环检测驱动器

3 个答案: