实际读到的字节数

ffjj56 2011-05-26 07:41:13

unsigned int bytesRead=fread(pSaveH,sizeof(char),fileLen,fp);
文本大小78202 实读77362 差了800多,这个差值表示的是有800多个'\n'对吗?

...全文

112 15 打赏收藏转发到动态举报

写回复

用AI写文章

15 条回复

切换为时间正序

请发表友善的回复…

发表回复

ffjj56 2011-05-26

打赏
举报

太谢谢各位了,我也是没有rb读过文本呢

feimashenhua 2011-05-26

打赏
举报

哦，12楼已经说了

feimashenhua 2011-05-26

打赏
举报

fread 一般用二进制方式打开文件

c_losed 2011-05-26

打赏
举报

[Quote=引用 10 楼 yfkiss 的回复:]

LZ可以用rb打开
测试代码：
C/C++ code

FILE * pFile;
long lSize;
char * buffer;
size_t result;

pFile = fopen ( "test.txt" , "rb" );
if (pFile==NULL) {fputs ("File error",stderr); exi……
[/Quote]
++
lz把模式改下就能一次读完了
汗啊木想到。。。

c_losed 2011-05-26

打赏
举报



#include<string>

#include <tchar.h>



int main(int argc, _TCHAR* argv[])

{

	FILE *fp=fopen("E:\\coffee\\MyTemp\\Price.txt","r+");

	fseek(fp,0,SEEK_END);

	int fileLen=ftell(fp);

	char *pSaveH=new char[fileLen+1]; //(std::nothrow) 

	if(!pSaveH) 

	{

		printf("pSaveH分配失败");

		return 1;

	}

	memset(pSaveH,0,sizeof(char)*fileLen);



	fseek(fp,0,SEEK_SET);

	unsigned int bytesRead=fread(pSaveH,sizeof(char),fileLen,fp);

	while (bytesRead != fileLen)

	{

		fseek(fp,bytesRead,SEEK_SET);

		unsigned int bytesReadAgain = fread(pSaveH,sizeof(char),fileLen,fp);

		bytesRead += bytesReadAgain;



	}

	fclose(fp);



	printf("%s",pSaveH);

	getchar();

	return 0;

}

yfk 2011-05-26

打赏
举报

LZ可以用rb打开
测试代码：



	FILE * pFile;

	long lSize;

	char * buffer;

	size_t result;



	pFile = fopen ( "test.txt" , "rb" );

	if (pFile==NULL) {fputs ("File error",stderr); exit (1);}



	// obtain file size:

	fseek (pFile , 0 , SEEK_END);

	lSize = ftell (pFile);



	cout << lSize << endl;

	rewind (pFile);



	// allocate memory to contain the whole file:

	buffer = (char*) malloc (sizeof(char)*lSize);

	if (buffer == NULL) {fputs ("Memory error",stderr); exit (2);}



	// copy the file into the buffer:

	result = fread (buffer,1,lSize,pFile);



	cout << result << endl;



	if (result != lSize) {fputs ("Reading error",stderr); exit (3);}



	/* the whole file is now loaded in the memory buffer. */



	// terminate

	fclose (pFile);

	free (buffer);



	getchar();

	

	return 0;

c_losed 2011-05-26

打赏
举报

确实木读完用循环判断继续读吧
文件大小78202字节
读取了77362字节

ffjj56 2011-05-26

打赏
举报

下面清晰些,仍是在最后多出来无意义的6行



#include "stdafx.h"

#include<string>



int _tmain(int argc, _TCHAR* argv[])

{

	FILE *fp=fopen("E:\\coffee\\MyTemp\\Price.txt","r+");

	fseek(fp,0,SEEK_END);

	int fileLen=ftell(fp);

	char *pSaveH=new(std::nothrow) char[fileLen+1];

	if(!pSaveH)

	{

		printf("pSaveH分配失败");

		return 1;

	}

	memset(pSaveH,0,sizeof(char)*fileLen);



	fseek(fp,0,SEEK_SET);

	unsigned int bytesRead=fread(pSaveH,sizeof(char),fileLen,fp);

	fclose(fp);



	printf("%s",pSaveH);

	getchar();

	return 0;

}

ffjj56 2011-05-26

打赏
举报



// console.cpp : 定义控制台应用程序的入口点。

//



#include "stdafx.h"

#include<string>



int _tmain(int argc, _TCHAR* argv[])

{

	FILE *fp=fopen("E:\\coffee\\MyTemp\\Price.txt","r+");

	fseek(fp,0,SEEK_END);

	int fileLen=ftell(fp);

	int len=800+fileLen;

	char *pFruit=new(std::nothrow) char[len];

	if(!pFruit){printf("pFruit分配失败"); return 1;}

	memset(pFruit,0,sizeof(char)*len);



	char *pSaveH=new(std::nothrow) char[fileLen+1];

	if(!pSaveH) {delete[] pFruit;printf("pSaveH分配失败"); return 1;}

	memset(pSaveH,0,sizeof(char)*fileLen);



	fseek(fp,0,SEEK_SET);

	unsigned int bytesRead=fread(pSaveH,sizeof(char),fileLen,fp);

	fclose(fp);

	if( pSaveH[strlen(pSaveH)-1]!='\n' || pSaveH[strlen(pSaveH)-2]=='\n' )

	{//总LF个数=fileLen-strlen=(text+LF*2)-(text+LF*1)

		printf("Price.txt结尾只能是1个\\n");

		delete[] pSaveH;delete[] pFruit;

		return 1;

	}

	return 0;

}