c/c++ 文件操作-EMV更新工具

最新推荐文章于 2021-07-16 14:37:32 发布

wenluowang

最新推荐文章于 2021-07-16 14:37:32 发布

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分类专栏： MFC学习历程

本文链接：https://blog.youkuaiyun.com/wenluowang/article/details/50371849

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本文详细阐述了在编程中如何使用if语句确保文件存在并进行读取操作，包括检查文件是否打开成功、文件内容读取及文件大小计算。

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if((fp = fopen(cfg_file, "r"))==NULL)                      //make sure to be opened file exist
	 {
		 printf("\n cannot find file\n");
		 exit(0);
	 }
	 else
	 {
		 
	 }
	printf("\n can find file\n");
	fseek(fp,0L,SEEK_END);                                      //calculate file size                  
	flen=ftell(fp);
	printf("shuzi :%d",flen);
	itoa(flen,hex_len,10);
	
	fread(fbuffer,4,1,fp);
	printf("\nfile content:%s\n",fbuffer);

if((fp = fopen(cfg_file, "r"))==NULL)                      //make sure to be opened file exist
	 {
		 printf("\n cannot find file\n");
		 exit(0);
	 }
	 else
	 {
		 fread(fbuffer,4,1,fp);
		 printf("\nfile content:%s\n",fbuffer);
	 }
	printf("\n can find file\n");
	fseek(fp,0L,SEEK_END);                                      //calculate file size                  
	flen=ftell(fp);
	printf("shuzi :%d",flen);
	itoa(flen,hex_len,10);