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DOS开发编程 & 发展交流（开发室） » How to call DOS system commands in C without showing the command line?

Floor1　utada	Posted 2003-08-05 00:00
初级用户　Posts 5　Credits 121
In C, when using execl to call another application under DOS, the command line gets displayed. How can I make that information not show up? Just like when using the sys function to call the copy command, the screen shows *** file copied. How can I keep that sentence from being displayed

Floor3　utada	Posted 2003-08-07 00:00
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I tried it. It doesn't work. Thank you anyway

Floor5　lemonhall	Posted 2003-08-10 00:00
高级用户　Posts 183　Credits 639
Under DOS 7.1, using ECHO can remove the COPY XXX shown when doing system("copy xxx". Using system("copy xxx >nul"; should remove that failed..... line. I haven't tried exec calls. There's another possibility: you're using an EXE file compiled with DJGPP. Its redirection is a bit different from ordinary DOS programs, so try using system("XXX XXX >>NUL" for redirection. If that still doesn't work, come back and ask again. If it really won't work, send me what you want to call, and after I test it I'll send you the source code.

Floor6　lemonhall	Posted 2003-08-10 00:00
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Oh right, I forgot to ask. What DOS version are you using? What compiler system?

Floor7　utada	Posted 2003-08-11 00:00
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I'm using MS-DOS 6.22. Do I have to use DOS 7.1? What I'm calling is an application made by someone else, used for FTP uploads under DOS.

Floor8　iceboy	Posted 2003-08-12 00:00
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">" and ">>" are redirection symbols. They can only redirect program output, and can't do anything about system prompts like "Bad command or file name".

Floor9　lemonhall	Posted 2003-08-17 00:00
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With ECHO OFF as a prerequisite, add the redirection. Everything will become absolutely silent. Hehe. . . .

Floor10　LanE	Posted 2003-08-17 00:00
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*The following is quoted from iceboy's post at 2003-8-12 14:55:36:* ">" and ">>" are redirection symbols. They can only redirect program output, and can't do anything about system prompts like "Bad command or file name". Also, program error messages can't be redirected either, for example: C:\>copy a.txt d:\ >nul File not found - a.txt I copied this from a DOS window

Floor11　lemonhall	Posted 2003-08-18 00:00
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Yeah, that's right. But under system and EXEC() calls, it really is completely silent. We're not discussing redirection itself, we're discussing "the use of redirection in programming". The discussion should address the OP's question!!

Floor12　lemonhall	Posted 2003-08-18 00:00
高级用户　Posts 183　Credits 639
Sigh, DOS 6.22 or DOS 7, that doesn't really matter. . . . . . . . . . Just send the program directly to me, and I'll try it with all the most popular compiler systems. Wouldn't that solve it?? I guess you're using TURBO C, right? Or BC? If you're using BC, you can also redirect ERROR output and do it with C++ streams. There are plenty of ways.

Floor13　LanE	Posted 2003-08-18 00:00
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*The following is quoted from lemonhall's post at 2003-8-18 11:34:57:* Yeah, that's right. But under system and EXEC() calls, it really is completely silent. We're not discussing redirection itself, we're discussing "the use of redirection in programming" The discussion should address the OP's question!! Hehe, sorry about that I forgot this was the programming section ]