字符串转换 char *->CComBSTR-> char *

[Imisspassword]

因为发现程序出现问题,所以做了一个测试:

读取一个日文(还测试过希腊文)的文本文件,将内容转为BSTR,然后再转回,保存后的文件与原文件部分字节不同,出现乱码.
很简单的程序:
FILE * fp=fopen("f:\\text\\test.txt","rb");
if(fp)
{
fseek(fp, 0, SEEK_END);
int len = (int)ftell(fp);
fseek(fp, 0, SEEK_SET);
char * buf=new char[len];
fread(buf,len,1,fp);
CComBSTR strNew;
strNew=CComBSTR(buf);
USES_CONVERSION;
LPCSTR str = OLE2A(strNew);
FILE * fp1=fopen("f:\\text\\test1.txt","wb");
fwrite(str,1,_tcslen(str),fp1);
fclose(fp1);
delete [] buf;
fclose(fp);
}
操作系统是英文.

[Zark]

少了终结符而已.
FILE * fp=fopen("f:\\text\\test.txt","rb");
if(fp)
{
fseek(fp, 0, SEEK_END);
int len = (int)ftell(fp);
fseek(fp, 0, SEEK_SET);
char * buf=new char[len+1];
fread(buf,len,1,fp);

*buf[len]='\0';

CComBSTR strNew;
strNew=CComBSTR(buf);
USES_CONVERSION;
// LPCSTR str = OLE2A(strNew);
LPCSTR str = OLE2T(strNew);
FILE * fp1=fopen("f:\\text\\test1.txt","wb");
fwrite(str,1,_tcslen(str),fp1);
fclose(fp1);
delete [] buf;
fclose(fp);
}

[Imisspassword]

楼上试过没有?我查看16进制编码,明显有多处不同.

[Imisspassword]

你的结论是想当然吧.
查了一下CComBSTR(buf);和OLE2A(strNew);这两处内部调用了MultiByteToWideChar和WideCharToMultiByte,而代码页只是简单的使用了CP_ACP,这才是导至乱码的原因.

[Zark]

当然是没有试过了,你让我伸手到你的硬盘里去拿f:\\text\\test.txt?