C语言文件路径设置

C语言中指定文件路径的三种方银凯法：

方法一：当前工程下的文件

fopen("demo.txt","rt")

方法二：当锋吵唤前工程下的 test文件夹 中文件

fopen(".\\test\\demo.txt","rt")

方法三：绝对路径，D盘下project文件夹中的文碰消件

fopen("d:\\project\\demo.txt","rt")

fp=fopen(filename,"wb")\x0d\x0a里的filename就表示了文件的路径及搜梁文件名，所以要把输入的冲数文件名和文件路径拼接起来，计算出散漏首这个filename\x0d\x0a最好过滤一下别让路径和文件名中有非法字符，比如:\/+什么的。\x0d\x0ascanf也限制一下长度。\x0d\x0ascanf("%19s",filename)\x0d\x0ascanf("%19s",path)\x0d\x0a参考如下：\x0d\x0a#include \x0d\x0a#include \x0d\x0aint main(void)\x0d\x0a{\x0d\x0a FILE *fp\x0d\x0a char ch, filename[20], path[20],buffer[40]\x0d\x0a printf("Enter the file name: ")\x0d\x0a scanf("%s",filename)\x0d\x0a printf("Enter the path: ")\x0d\x0a scanf("%s",path)\x0d\x0a sprintf(buffer, "%s\\%s", path,filename)\x0d\x0a printf("\nto end input ,press Ctrl+Z in newline,then ENTER:\n")\x0d\x0a if((fp=fopen(buffer,"wt+"))==NULL)\x0d\x0a {\x0d\x0a printf("no such path, \nstrike any key exit!")\x0d\x0a getch()\x0d\x0a exit(1)\x0d\x0a }\x0d\x0a while ((ch=getchar())!=-1) ch=fputc(ch,fp)\x0d\x0a fclose(fp)\x0d\x0a printf("==================================\n\n")\x0d\x0a printf("file path \"%s\" \nfile name \"%s\":\nand its content:\n",path,filename)\x0d\x0a fp=fopen(buffer,"rt")\x0d\x0a while ((ch=fgetc(fp))!=-1) putchar(ch)\x0d\x0a fclose(fp)\x0d\x0a return 0

---