Resolve command line parameters in C

This article will demonstrate how to parse command line parameters in C language. The following code implements a simple command line parameter parser that can handle file paths, boolean flags, and integer values.

 <code class="c">#include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <string.h> // 定义结构体存储命令行参数typedef struct { char* filepath; bool myflag; int myvalue; } cliargs; // 错误处理函数static inline void error(const char* message) { fprintf(stderr, "%s\n", message); exit(1); } // 命令行参数解析函数cliargs parse(int argc, char** argv) { cliargs cli_args = { .filepath = NULL, .myflag = false, .myvalue = 0 }; if (argc == 1) error("未传入任何参数。"); // 解析参数for (int i = 1; i = argc) { error("未为--myvalue参数指定值。"); } char* endptr; long value = strtol(argv[i 1], &endptr, 10); if (*endptr != '\0' || value > INT_MAX || value </string.h></stdlib.h></stdio.h></stdbool.h></code>

How to use:

1. Compile code: gcc cli_args.c -o cli_args

2. Run the program and pass in the parameters:

   • ./cli_args foo.txt (Specify file path only)
   • ./cli_args foo.txt --myvalue 123 (Specify file path and integer value)
   • ./cli_args foo.txt --myflag --myvalue 456 (Specify file path, boolean flag, and integer value)

The program handles errors and provides clearer output information. Please note that in this example, only two parameters --myflag and --myvalue are processed, and the parameter processing logic can be extended according to actual requirements.

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