c++读取文件最后一行（转）

 

int main() {
	FILE *fp;
	char sline[1024];
	size_t rd;
	int i;


	fopen_s(&fp, "D:\\111.txt", "r");
	if (fp == NULL) {
		//printf("%d,[%s]\n", errno, strerror(errno));
		return 0;
	}

	fseek(fp, 0, SEEK_END);
	if (ftell(fp) > 1023)
		fseek(fp, -1023, SEEK_CUR);
	else
		fseek(fp, -ftell(fp), SEEK_CUR);

	memset(sline, 0, sizeof(sline));
	rd = fread(sline, 1, 1023, fp);
	if (sline[rd - 1] == '\n')
		sline[rd - 1] = 0;

	for (i = (1023 > rd ? rd : 1023); i >= 0; i--) {
		if (sline[i] == '\n') {
			break;
		}
	}
	if (i < 0) {
		printf("this line is too long....\n");
		return 0;
	}
	printf("last line is:\n%s\n", sline + i + 1);

	return 0;
}