1.纯C实现
代码如下:
FILE *fp;
if ((fp = fopen("example.txt", "rb")) == NULL)
{
exit(0);
}
fseek(fp, 0, SEEK_END);
int fileLen = ftell(fp);
char *tmp = (char *) malloc(sizeof(char) * fileLen);
fseek(fp, 0, SEEK_SET);
fread(tmp, fileLen, sizeof(char), fp);
fclose(fp);
for(int i = 0; i < fileLen; ++i)
{
printf("%d ", tmp[i]);
}
printf("n");
if ((fp = fopen("example.txt", "wb")) == NULL)
{
exit(0);
}
rewind(fp);
fwrite(tmp, fileLen, sizeof(char), fp);
fclose(fp);
free(tmp);
2.利用CFile（MFC基类）
CFile需要包含的头文件为Afx.h
打开文件的函数原型如下
if(!(fp.Open((LPCTSTR)m_strsendFilePathName,CFile::modeRead)))
有多种模式,常用的有如下:
modeRead
modeWrite
modeReadWrite
modeCreate
文件类型有两种:
typeBinary
typeText
读写非文本文件一定要用typeBinary
读取数据的函数原型:
virtual UINTRead(void*lpbuf, UINT nCount);
将文件读出:
代码如下:
CFile fp;
if(!(fp.Open((LPCTSTR)m_strsendFilePathName,CFile::modeRead)))
{
return;
}
fp.SeekToEnd();
unsignedint fpLength = fp.GetLength();
char *tmp= new char[fpLength];
fp.SeekToBegin(); //这一句必不可少
if(fp.Read(tmp,fpLength) < 1)
{
fp.Close();
return;
}
// 新建文件并写入
代码如下:
if(!(fp.Open((LPCTSTR)m_strsendFilePathName,
CFile::modeCreate | CFile::modeWrite |CFile::typeBinary)))
{
return;
}
fp.SeekToBegin();
fp.write(tmp,fpLength);
fp.close;