如何对两个二进制文件进行比较?

[easthg]

我的实现思路如下：
1) 获取文件的大小，申请内存空间.
2) 获取指针（char *）
3) 调用memcmp()进行比较.
而我打开一个文件进行比较，程序出现异常而死掉!
如何对两个二进制文件进行比较?

[闻缺陷则喜何志丹]

请给出代码!

[DentistryDoctor]

思中和没问题，可能是内存操作不当吧。代码!

[kpld8888]

用fopen打开试试？

[easthg]

HGLOBAL hFirst,hSecond;
char *m_pFirst;
char *m_pSecond;
hFirst = ::GlobalAlloc(GMEM_MOVEABLE|GMEM_ZEROINIT,1);
hSecond= ::GlobalAlloc(GMEM_MOVEABLE|GMEM_ZEROINIT,1);
m_pFirst = (char*)::GlobalLock(hFirst);
m_pSecond= (char*)::GlobalLock(hSecond);
mmsFirst.GetFileContent(m_pFirst,i);(读数据到m_pFirst中，其中是以(char*))
mmsSecond.GetFileContent(m_pSecond,i);
result = memcmp(m_pFirst,m_pSecond,firstSize);//死掉的地方.

[easthg]

其中hFirst ，hSecond 在GetFileContent()函数中做了调整了。

[easthg]

GetFileContent(char *buf,int m_iFileIndex)
{
/*
char * buf : 应该是指向 GlobalAlloc() 所分配的内存空间.
*/
// 判断是否已经分配空间.
if(IsOpen())
{
int m_iFileCount = GetFileNumber();
if((m_iFileIndex+1)<=m_iFileCount)
{
//hGlobal = GlobalReAlloc(hGlobal,lnewHeadSize+lnewBodySize,GMEM_MOVEABLE|GMEM_ZEROINIT);
HGLOBAL hGolTmp = GlobalHandle(buf);
unsigned long l = GetSpecialFileSize(m_iFileIndex);
hGolTmp = GlobalReAlloc(hGolTmp,l,GMEM_MOVEABLE|GMEM_ZEROINIT);
buf = (char*)GlobalLock(hGolTmp);
// 得到偏移地址.
int m_iadd = atoi(GetMemoryAreaData(m_p + Extra_Info_Size + File_Unit_Size*m_iFileIndex + File_Type + File_Name,File_Address));
if(m_iadd<=0)
return FALSE;
memcpy(buf,m_p + m_iadd,l);
GlobalUnlock(hGolTmp);
return TRUE;
}
else
return FALSE;
}
return FALSE;
}

[yjy1001]

//返回1表示相同，否则表示不同
#include <stdio.h>
bool FileCMP(char *fName0, *fName1)
{
FILE *fp0, *fp1;
char *fbuf0, *fbuf1;
int liv_fsize0, liv_fsize1;

fp0 = fopen (fName0, "rb");
if (!fp0)
{
return 0;
}

fp1 = fopen (fName1, "rb");
if (!fp1)
{
return 0;
}

fseek(fp0, 0, SEEK_END);
liv_fsize0 = ftell(fp0);
fseek(fp0, 0, SEEK_SET);


fseek(fp1, 0, SEEK_END);
liv_fsize1 = ftell(fp1);
fseek(fp1, 0, SEEK_SET);

if (liv_fsize0 != liv_fsize1)
{
return 0;
}

fbuf0 = new char[liv_fsize0 + 1];
fbuf1 = new char[liv_fsize1 + 1];

fread(fbuf0, 1, liv_fsize0, fp0);
fread(fbuf0, 1, liv_fsize0, fp0);

fclose(fp0);
fclose(fp1);

for (int i = 0; i < liv_fsize0; i++)
{
if (fbuf0[i] != fbuf1[i])
{
delete[] fbuf0;
delete[] fbuf1;
return 0;
}
}

delete[] fbuf0;
delete[] fbuf1;
return 1;
}

临时写的代码，没调试，应该很容易调试出来的