[英]How many ways are there to execute system command in C program for windows
I am using MS visual studio 2008, for C coding. 我正在使用MS visual studio 2008进行C编码。
I know we can use " int system(const char *command)
" to execute commands. 我知道我们可以使用“
int system(const char *command)
”来执行命令。
Is there any other method to execute system commands in C program. 还有其他方法可以在C程序中执行系统命令。 Also I need to store output of executed command in a variable.
另外,我需要将执行命令的输出存储在变量中。
system()
function execute command and send output to stdout
, is there any way to read from stdout
and store in variable. system()
函数执行命令并将输出发送到stdout
,有什么方法可以从stdout
读取并存储在变量中。
So my ultimate goal is to execute system command in C program for windows (using visual studio) and store output of that command in a variable. 因此,我的最终目标是在Windows的C程序中执行系统命令(使用Visual Studio)并将该命令的输出存储在变量中。 Any suggestions ?
有什么建议么 ?
Standard C libraries give you only one way to execute external command in OS, so use int system(const char *command)
. 标准C库仅提供一种在OS中执行外部命令的方法,因此请使用
int system(const char *command)
。
You can save output of this command to text file, and then read this file from you program. 您可以将该命令的输出保存到文本文件,然后从程序中读取该文件。
For example: 例如:
#include <stdio.h>
#include <stdlib.h>
#define TMP_FILE_NAME "TMP_FOLDER_CONTENT.txt"
int main(int argc, char *argv[])
{
system("dir C:\* > "TMP_FILE_NAME);
FILE * fdir = fopen(TMP_FILE_NAME, "r");
char buff[100];
if (fdir)
{
while (1) {
if (fgets(buff, 100, fdir) == NULL) break;
printf("%s", buff);
}
}
fclose(fdir);
remove(TMP_FILE_NAME);
return 0;
}
Where dir
is a program to be executed, C:\\*
- argument of the program, and >
- redirection of standard output for that command after which filename TMP_FOLDER_CONTENT.txt
will be substituted. 其中
dir
是要执行的程序, C:\\*
-该程序的参数, >
-该命令的标准输出重定向,之后将替换文件名TMP_FOLDER_CONTENT.txt
。
Also you can check returned value, as: 您还可以检查返回值,例如:
int errorcode = system("dir C:\* > "TMP_FILE_NAME);
printf("Command executed and returned a value %d\n", errorcode);
or taking into account command you use, change the logic of your program, eg: 或考虑到您使用的命令,请更改程序的逻辑,例如:
int errorcode = system("dir C:\* > "TMP_FILE_NAME);
if( errorcode )
{
return errorcode;
}
UPDATE: 更新:
Alternatively, you could use pipes in C++, for example as shown in the answer to question How to execute a command and get output of command within C++ using POSIX? 或者,您可以使用C ++中的管道,例如,如问题解答中所示, 如何使用POSIX在C ++中执行命令并获取命令输出?
您可以按照@VolAnd的说明进行操作,或者如果您不关心/不希望命令的输出位于stdout
并且也不想将其他任何内容打印到stdout
,则可以使用freopen进行设置标准输出到您选择的文件。
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