C语言“fread”函数的用法？

C语言“fread”函数的用法？

C语言“fread”函数的用法为“size_tf read(void *buffer,size_t size,size_t count,FILE *stream)”，其作用是从一个文件流中读数据，读取count个元素，每个元素size字节。

示例1

#include <stdio.h> #include <process.h> #include <string.h> int main() { 	FILE *stream; 	char msg[]="this is a test"; 	char buf[20]; 	if ((stream=fopen("dummy.fil","w+"))==NULL) 	{ 		fprintf(stderr,"cannot open output file.\n"); 		return 1; 	} 	/*write some data to the file*/ 	fwrite(msg,1,strlen(msg)+1,stream); 	/*seek to the beginning of the file*/ 	fseek(stream,0,SEEK_SET); 	/*read the data and display it*/ 	fread(buf,1,strlen(msg)+1,stream); 	printf("%s\n",buf); 	fclose(stream); 	system("pause"); 	return 0; }

int main(void) { 	FILE *stream; 	char list[30]; 	int i,numread,numwritten; 	/*open file in text mode:*/ 	if ((stream=fopen("fread.out","w+t"))!=NULL) 	{ 		for (i=0;i<25;i++) 		{ 			list[i]=(char)('z'-i); 		} 		/*write 25 characters to stram*/ 		numwritten=fwrite(list,sizeof(char),25,stream); 		printf("Wrote %d items\n",numwritten); 		fclose(stream); 	} 	else 		printf("Problem opening the file\n");         if ((stream=fopen("fread.out","r+t"))!=NULL)         { 			numread=fread(list,sizeof(char),25,stream); 			printf("Number of items read =%d\n",numread); 			printf("Contents of buffer=%.25s\n",list); 			fclose(stream);         }          else         { 			printf("File could not be opened\n");         } 	system("pause"); 	return 0; }

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