标准文件操作

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FILE *fp; long file_size = 0; if (NULL == (fp = fopen(fname, "r"))) {    return -1; } fseek(fp, 0, SEEK_END); file_size = ftell(fp); fseek(fp, 0, SEEK_SET); fread(fc, 1, 1024, fp);  fwrite(&usvr_data, 1, sizeof(usvr_data), fp); fclose(fp);