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中国DOS联盟论坛 » 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? View 2,001　Replies 12
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Original Poster Posted 2003-08-05 00:00　·　 中国 浙江 杭州 电信
utada
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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
Floor 2 Posted 2003-08-06 00:00　·　 美国 肯塔基州 费耶特县 列克星敦 Charter_Communications
Wengier
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Try adding ">nul" at the end. . .
Wengier - 新DOS时代

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Floor 3 Posted 2003-08-07 00:00　·　 中国 浙江 杭州 电信
utada
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I tried it. It doesn't work. Thank you anyway
Floor 4 Posted 2003-08-09 00:00　·　 中国 上海 电信
yanyanming
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Use echo
Floor 5 Posted 2003-08-10 00:00　·　 中国 陕西 西安 教育网
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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.
REM 喜欢DOS，因为它的简单
REM 喜欢OS/2，因为它不再矫饰
REM 喜欢BASIC，因为它并不幼稚
REM 喜欢GNU，因为它杂乱无章
Floor 6 Posted 2003-08-10 00:00　·　 中国 陕西 西安 教育网
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Oh right, I forgot to ask. What DOS version are you using? What compiler system?
REM 喜欢DOS，因为它的简单
REM 喜欢OS/2，因为它不再矫饰
REM 喜欢BASIC，因为它并不幼稚
REM 喜欢GNU，因为它杂乱无章
Floor 7 Posted 2003-08-11 00:00　·　 中国 浙江 杭州 电信
utada
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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.
Floor 8 Posted 2003-08-12 00:00　·　 中国 湖北 武汉 联通
iceboy
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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".
Somehow somewhere I've got to choose.
No matter if it is win or lose.
Floor 9 Posted 2003-08-17 00:00　·　 中国 陕西 西安 教育网
lemonhall
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With ECHO OFF as a prerequisite, add the redirection. Everything will become absolutely silent. Hehe. . . .
REM 喜欢DOS，因为它的简单
REM 喜欢OS/2，因为它不再矫饰
REM 喜欢BASIC，因为它并不幼稚
REM 喜欢GNU，因为它杂乱无章
Floor 10 Posted 2003-08-17 00:00　·　 中国 安徽 滁州 天长市 电信
LanE
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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
Floor 11 Posted 2003-08-18 00:00　·　 中国 陕西 西安 电信
lemonhall
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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!!
REM 喜欢DOS，因为它的简单
REM 喜欢OS/2，因为它不再矫饰
REM 喜欢BASIC，因为它并不幼稚
REM 喜欢GNU，因为它杂乱无章
Floor 12 Posted 2003-08-18 00:00　·　 中国 陕西 西安 电信
lemonhall
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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.
REM 喜欢DOS，因为它的简单
REM 喜欢OS/2，因为它不再矫饰
REM 喜欢BASIC，因为它并不幼稚
REM 喜欢GNU，因为它杂乱无章
Floor 13 Posted 2003-08-18 00:00　·　 中国 安徽 滁州 天长市 电信
LanE
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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 ]
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