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中国DOS联盟论坛 The time now is 2026-08-19 04:11 |
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| DOS疑难解答 & 问题讨论 （解答室） » Please explain the code for detecting a CD-ROM drive? |
| Printable Version 719 / 0 |
| Floor1 handan | Posted 2007-12-29 21:40 |
| 初级用户 Posts 12 Credits 30 | |
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1:if exist G:\nul.ext (echo disc present) else (echo no disc)
What does nul.ext mean here, and why can it be used for detection? 2:if exist \\?\CdRom0\* (echo OK) else (echo NO) what does \\?\CdRom0\* mean Also, is it a CMD command? How do you use it? |
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