C / C++ / MFC

Albert Holguin wrote:

This isn't great code, first off, if you're comparing bytes, why use unsigned int to store your target array? Use char, or BYTE, or something similar (that's 8 bits)... now the other question is if you're looking for specific bytes, why open the file in text mode? ...and finally, you can probably do without the goto statement... as for your question, what do you want help with, what doesn't work or what is the error?

 

int FindBytes ( unsigned char data [], int datalength,  char *filename )
{
	int sz = GetszFile(filename);

	FILE *file;
	file = fopen(filename, "rb");
	
	int pos = 0;
	int length = datalength - 1;
	char ch;
	int cpos = 0;
	
	for (int ic = 0;ic < sz; ic++)
	{
		ch = getc(file);
		if(ch == data[0])
		{
			pos += length - 1;
			fseek(file , pos , SEEK_SET);
			ch = getc(file);
			if(ch == data[length])
			{
				for(int i = 0;i <= length;i++)
				{
					cpos = pos - length + i;
					fseek(file, cpos, SEEK_SET);
					ch = getc(file);
					if(ch != data[i])
					{
						fseek(file , cpos, SEEK_SET);
						goto resume;
					}
				}
			    return pos - length;
			}
		}
		else
		{
			resume:
			fseek(file, pos, SEEK_SET);
		}
		pos++;
	}
	return pos;
}

Smart Arab wrote:

 
I still want to find a good function to search bytes in binary file

//Presented here in pseudo-code
bool found = false; 
int m_State = 1, origin = 0;
while((ch = getc(file) != EOF) && (!found))
{
	//State Machine
	switch(m_State)
	{
	case 1:
		if(ch == data[0]){
                        origin = ftell(file)- 1;
			m_State = 2;
                }
		break;
	case 2:
		if(ch == data[1])
			m_State = 3;
		else m_State = 1;
		break;
	case 3:
		if(ch == data[2])
			m_State = 4;
		else m_State =1;
		break;
	case 4:
		if(ch == data[3])
			found = true;
		else m_State = 1;
		break;
	}
}

yogeshs wrote:

I know this is not related to c++...i have to implement it in c++

CRect rect;
	this->GetWindowRect( &rect );
	this->GetParent()->ScreenToClient( rect );
 CBitmap img;
   CDC dc;
   BITMAP bmp;
   img.LoadBitmap(m_nImageID);
   img.GetBitmap(&bmp);
   CDC* pDC = this->GetDC();
   dc.CreateCompatibleDC(pDC);
   CBitmap* pOld = dc.SelectObject(&img);
pDC->BitBlt(rect.left, rect.top, bmp.bmWidth, bmp.bmHeight, &dc, 0, 0, SRCCOPY);

CRect rect;
	this->GetWindowRect( &rect );
	this->GetParent()->ScreenToClient( rect );
m_img = Gdiplus::Bitmap::FromResource(GetModuleHandle(0),MAKEINTRESOURCE(nImage));
grpx.DrawImage(m_img, 0, 0, m_img->GetWidth(),m_img->GetHeight());