讀取Hex檔案並求和

1.讀取hex檔案

void ctestprojectdlg::onbnclickedbuttonreadhex()

cfile m_file;
m_file.open(filename, cfile::modenotruncate | cfile::modecreate | cfile::moderead);
int nlen = (int)m_file.getlength();//檔案的長度
unsigned char *m_bigdatabuf;
m_bigdatabuf = (unsigned char*)malloc(nlen);
m_file.seektobegin();
m_file.read(m_bigdatabuf, nlen);
m_file.close();
yangsen.clear();
uint ntotalsum = inchecksum8(m_bigdatabuf, nlen);
uint ntotalsum = inchecksum8(m_bigdatabuf, nlen-2);//就代表最後兩個數不加
}

uint ctestprojectdlg::inchecksum8(unsigned char* addr, int len)

//計算從後往前累加，看累加到哪個值之後總和的後2個位元組值等於42759
// 	addr += len-1;
// 	while (len > 0)
// 	
// 		addr -= 1;
// 		len -= 1;
// 	}
return sum;
}

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