1 問題

把最簡單的字符串數(shù)據(jù)追加寫入文件

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2 代碼實現(xiàn)

#include <stdio.h> #include <string.h>void write_data_to_file(const char *path, char *str) {FILE *fd = fopen(path, "a+");if (fd == NULL) {printf("fd is NULL and open file fail\n");return;}printf("fd != NULL\n");if (str && str[0] != 0) {fwrite(str, strlen(str), 1, fd);char *next = "\n";fwrite(next, strlen(next), 1, fd);}fclose(fd); }int main() {char *path = "/home/chenyu/Desktop/linux/wf/c.txt";char *str = "chenyu";char *str1 = "hell word";char *str2 = "write data to file";write_data_to_file(path, str);write_data_to_file(path, str1);write_data_to_file(path, str2);return 0; }

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3 運行結果

gcc -g write.c -o write ./writevim c.txtchenyu hell word write data to file

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