Boost

After class the other day a question had been raised about network programming, I've used Boost::asio in the past for my own network programming tasks. Boost is a third party library pack, designed for platform independence, that contains libraries for a large majority of common tasks. Boost ASIO is their (A)Synchronous In Out library that contains support for, among other tasks, TCP/UDP programming. In order to implement full duplex(asynchronous) communication you also need to implement threading to allow the reading and writing handles to run on separate threads to prevent them from blocking one another - synchronous communication. Boost provides thread management support in their Boost::thread library.

http://www.boost.org/

Bits and Bytes

I completed these a while ago and but forgot to post it. I haven't completed the Bits class yet but I have finished all the functions.

void copyBits(unsigned int& V, int bitNo, int NoOfBits, unsigned int mask){
  unsigned int m;
  for(int x=1, m=1<<bitNo; x<=NoOfBits; x++, m<<=1){
    setBit(V,(bitNo+x), (mask&m)&&1);
  }
}
void setBit(unsigned int& V, int bitNo, bool value){
  if(value){
    V = V | (1<<(bitNo-1));
    }
  else{
    V = V & ~(1<<(bitNo-1));
    }
}
void prnBits(unsigned int val){
  unsigned int m = 1 << sizeof(val)*8-1;
  int count=0;
  while(m){
    if(count==4){
      printf(" ");
      count=0;
    }
    printf("%d", (val & m)&&1);
    m = m >> 1;
    count++;
  }
}
const char* bits(unsigned int val){
  const unsigned int valSize=sizeof(val)*8-1;
  char* output = new char[valSize+2];
  unsigned int m = 1 << valSize;
  int x=0;
  for(x=0;x<=valSize;x++, m = m >> 1){
    output[x]=(val & m ? '1' : '0');
  }
  output[x]='\0';
  return output;
}
void bitDump(void* address, unsigned int sizeInBytes){
  unsigned long long valSize=(sizeInBytes*8)-1;
  unsigned long m = 1 << valSize;
  long long temp = *(reinterpret_cast<long long *>(address));
  int count=0;
  unsigned long x=0;
  printf("\n");
  for(x=0;x<=valSize,m;x++, m = m >> 1){
    if(count==4){
      printf(" ");
      count=0;
    }
    printf("%d", ((temp) & m)&&1);
    count++;
  }
}


0.5 CDialog issue

I noticed this when testing cmenuitem, when the following code is run it checks the address of the returning variable against the current pointer in the array. The thing is though that the return variable is a reference to a pointer object, I debugged massively the incoming and outgoing addresses in CDialog's add and I know for a fact that the proper address is stored within CDialog _fld but since curField() returns a reference I don't know how to get it to check against the proper address of the pointer it is referencing.

// Test7MenuItem.cpp

 for(int i=0;i<3;i++){
         if(&FD.curField() == m[i]){
            si[16] = '0' + i;
            FD[3].set(si);
          }

//cdialog.cpp

 CField& CDialog::curField(){
    return (CField&)_fld[_curidx];
  }

this

One thing I've noticed a lot of people asking is about the constructors asking to instantiate property _Label's container/frame. The hint that Fardad gave was (i.e. this). It's saying that the owner class should be set to the frame of the _Label, the code for that would be:  _Label.frame(this); since this is a pointer to the class it would pass the class to _Label's frame.

Week 3 To Do's

For the Xmover program, the solution I wrote is a total kludge. If I come up with something a little more elegant I'll post that code later.


case DOWN:
 if(row < console.getRows()-1){
 if(row == console.getRows()-2 && col == console.getCols()-1){
 console.alarm();
 }
 else{
 row++;
 }
      }
      else{
        console.alarm();
      }
      break;


case RIGHT:
      if(col < console.getCols()-1){
 if(col == console.getCols()-2 && row == console.getRows()-1){
 console.alarm();
 }
 else{
col++;
 }
      }
      else{
        console.alarm();
      }
      break;


For removing the 'if' from the ::display() function and reducing it to one line I once again wrote a total kludge, it is completely confusing to look at and it's ugly but dang it it works.


  void Console::display(const char* str, int row, int col, int fieldLen){
        setPos(row, col);
int i;
for(i=0,fieldLen==0?fieldLen=strlen(str):i=0;i<fieldLen;str[i]!=0?putChar(str[i]):putChar(' '),i++);
  }

This code also makes it possible to display any characters that you may insert past the first NULL char in the array when you are scrolling through str.

prnenv v2

Here is the updated code that prints out a list of suggested matches: All the updated code has already been pushed to the repo if you wish to view the full code.

                    else{
/* If the search is not a complete match,
  then it prints out a list of partial matches.
*/
cout << "That environmental variable is not found." << endl;
cout << "Did you mean:" << endl;
for(x=0;env[x]!=0;x++){
pch=strstr(env[x], str);
if(pch){
pch2 = NULL;
pch2 = strtok (env[x], "=");
if(pch2)
cout << pch << endl;
} // End of if
} // End of for
// Resets result variable back to original size to allow proper deletion.
strcpy(result, env[y]);
delete [] result;
} // End of else

Week 2 CL exercises

I've set up a github repo where I will be saving all my exercises through the semester to. I'm doing this as practice to get used to using git as well as the fact that I'm bouncing around four different OS's as well as a couple of different development set-ups.

https://github.com/Zardvark/OOP-344-Exercises is the main Repo link

Here are the first four CL programs:
add.cpp
div.cpp
mul.cpp
sub.cpp

And here is the prnenv.cpp program, after I finish my INT lab I will go back and attempt add on a "Did you mean:" search function to the prnenv program, if I get it working I will post the code directly to this blog