C / C++ / MFC

Nitheesh George wrote:

So I need to pass the main window handle of the launcher application to my second application like /CallingProgramWindow="0001009C". Then how can i convert the string back to window handle. And is this method is the right way to do this.?

Nitheesh George wrote:

So I need to pass the main window handle of the launcher application to my second application

Mark Salsbery
Microsoft MVP - Visual C++

return new T;

handle h;
classA* a = h::operator-> <classA> ();

template <class T>
class handle {
   T* operator->() {
      return new T;
   }
};
class classA {
public:
  doWork();
};
// ...
   handle<classA> hA;
   hA->doWork(); // calls classA::doWork(), but produces a memory leak!
   classA* a = hA.operator->(); // we need the full operator name for this
   a->doWork(); // again, calls classA::doWork as above
   delete a; // clean up, thanks to the reference we stored

#include <string>
#include <functional>

template < typename TPrinter >
void PrintBy( std::string const & pString, TPrinter pPrinter )
{
    pPrinter(pString);    
}

// Your stuff ...

int main()
{
    ::PrintBy( "hi", Print );
    
    ::Printer p;

    ::PrintBy( "hi again", std::bind( &::Printer::Print, &p, std::placeholders::_1 ) );
}    

pos += length - 1;
fseek(file , pos , SEEK_SET);

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;
	}
}