windows mingw 星号“*"通过 argv[1] 传递给字符串 [英] windows mingw asterisk '*' passing by argv[1] to string

问题描述

我在下面写了一段代码

#include<stdio.h>

int main(int argc, char *argv[]) {
    char cmd[50]="dir";
    if (argc == 2) {
        sprintf(cmd,"dir %s",argv[1]);
    }
    if (argc == 3) {
        sprintf(cmd,"dir %s %s", argv[1], argv[2]);
    }
    printf("%s\n",cmd);
    system(cmd);
    return 0;
}

当我像下面这样执行时

我认为不能通过 *argv[] 传递 '*'

I think can't pass '*' by *argv[]

如何传递类似 "*.c" 的内容?

How can I pass something like "*.c" ?

更新

代码

#include<stdio.h>

int main(int argc, char *argv[]) {
    char cmd[50]="dir";
    if (argc == 2) {
        sprintf(cmd,"dir %s",argv[1]);
    }
    if (argc == 3) {
        sprintf(cmd,"dir %s %s", argv[1], argv[2]);
    }
    if (argc > 3) {
        sprintf(cmd,"dir %s %s", argv[1], argv[2]);
    }
    printf("%s\n",cmd);
    system(cmd);
    return 0;
}

变化如下

什么.....@.@?

what..... @.@ ?

再次更新代码

#include<stdio.h>
#include<string.h>

int main(int argc, char *argv[]) {
    int i;
    char sp[2]=" ", cmd[250]="dir";
    if (argc > 1) {
        sprintf(cmd,"dir /d ");
        for (i =1 ; i < argc; i ++)  {
            strcat(cmd,sp);
            strcat(cmd,argv[i]);
        }
    }
    printf("%s\n",cmd);
    system(cmd);
    return 0;
}

看看我执行时会发生什么

see what happen when I executed

有点丑……有什么好主意吗?

kind of ugly.... any decent idea?

推荐答案

这个问题与 C 运行时无关，而是与 shell 行为有关.如果您使用 Windows CMD.EXE，* 会原封不动地传递给程序，而如果您使用 Cygwin 的 bash，shell 会将 * 扩展到文件列表并传递它扩展作为程序的单独参数.您可以通过用 "*" 或 '*' 引用通配符来防止这种扩展.

This issue is not related to the C runtime, but to the shell behaviour. If you use Windows CMD.EXE, the * is passed unchanged to the programs, whereas if you use Cygwin's bash, the shell expands * to the list of files and passes this expansion as individual arguments to your program. You can prevent this expansion by quoting the wildcards with "*" or '*'.

请注意，您不应该使用 sprintf，而应使用 snprintf 以避免缓冲区溢出.如果您链接到非标准 Microsoft C 库，则可能需要改用 _snprintf.

Note that you should not use sprintf, but snprintf to avoid buffer overflows. If you link to the non standard Microsoft C library, you may need to use _snprintf instead.

CMD.EXE 似乎不会扩展通配符，但是您链接程序的 C 运行时可能会在启动时扩展.请参阅此问题:Gnuwin32 find.exe 在执行搜索之前扩展通配符

CMD.EXE does not seem to expand wildcards, but the C runtime you link your program with might do it at startup. See this question: Gnuwin32 find.exe expands wildcard before performing search

解决方案是引用参数.

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