C / C++ / MFC

28-Mar-04 13:37

Hey guys,

I 'm having problem reading data from a text file.

Sample.dat contains

M
Bob
Dude
56
F
Carmen
Sandiago
33
VP

my code is suppose to read the .DAT file using ios::binary
and feed the information into a class.

example class...

class personInfo
{
char firstname[20];
char lastname[20];
int age;
char gender;
}

class femleInfo : public personInfo
{
char title[5];
}

acutally I have a polymorphic function that reads male info into a maleInfo Class and femaleInfo into a femaleInfo class.

The problem is,how do I read both male and female info seperately and load the appropriate class? (they both have differnt number of data members)....

I tried using seekg function and to move the pointer but I didnt really understand it,

Can someone pls help.

Christian Graus28-Mar-04 14:17

28-Mar-04 14:17

Create an iostream inserter/extracter for personInfo, have it return the appropriate type of object, based on the first data item read ( the sex ).

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

LudaLuda28-Mar-04 14:45

28-Mar-04 14:45

yes that is what Im doing,
the problem Im having is, how to read the the data into my class ???

I tried myDataFile.read(reinterpret_cast<char*> (&fObject),fObjSize);
and I thought this would copy each data item from the text file into the class varibales???

that doenst seem to be happening, am I missing something?

Christian Graus28-Mar-04 14:47

28-Mar-04 14:47

Yes, what you need to do is to stream in the variables one at a time. For starters, you've already read the first value out of the file, secondly, you're not allowing for whitespace, which also takes up room in the file. Oh, then you've got byte ordering of any number variable larger than a char, and the fact that that any number is stored not as a number value, but a line of chars.

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

LudaLuda28-Mar-04 14:57

28-Mar-04 14:57

confused .......pls explain a little more.

are you saying that I have to read each varible line by line from the text file and load it onto my class? what function do I use? do I still use
inDataFile.read(reinterpret_cast<char*> ???
what would be the exact lines to use the above ?

thnks for ur help

Christian Graus28-Mar-04 15:13

28-Mar-04 15:13

Going back to where I started, you need to create an iostream inserter/extracter for the class, like this[^]. Then you'd need to do something like

personStruct a; // whatever your variable type was, it should really be a struct, in any case.

myStream >> a;

// Now check the data member that telss you if it's a female, and treat it accordingly. I'd be incline to use just one struct, and just null the data that is not appropriate, instead of the way you are doing things now.

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

LudaLuda28-Mar-04 15:20

28-Mar-04 15:20

okey got it.

thanks a lot.

Making a macro

MeterMan28-Mar-04 13:27

MeterMan

28-Mar-04 13:27

Just curious does anyone have a tutorial on how to make a macro in visual c++. I have this program called total recorder that records streaming audio and i have a radio show that comes on early in the morning. I'm usually not away so i wanted to write a c++ program that would launch total recorder say with shellexecute that part is easy. I just can't figure out how to make it click the mouse like a macro. Thanks for your help.

Talk to me like a baby cause when it comes to programming i still wear a training pants Smile | :)

Win32newb
"Making windows programs worse than they already are"

Christian Graus28-Mar-04 14:14

28-Mar-04 14:14

You need to look into SendMessage, perhaps. It sounds messy to me though.

I thought you wanted to create a macro in C++, as in #define, I was ready to read you the riot act Smile | :)

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

SiddharthAtw28-Mar-04 19:52

SiddharthAtw

28-Mar-04 19:52

I think I can help U in it. But definately it needs detailed discussion. Time being. Every Microsoft windows has a class name and window text. and at any given instance Desktop will be parent of all windows. U can find these using Spy++ in windows. So just iterate from desktop as root windows using treeView to Ur target message. Using SendMessage or Postmessage pass WM_BCLICK or WM_LBUTTONDOWN or what ever.
hope it helps

MeterMan28-Mar-04 22:00

MeterMan

28-Mar-04 22:00

I looked up SendMessage and post message but wasn't too clear on it.
How do i tell it which window to send it to?
I opened up spy++ and i found my message. I'm assuming i need to the window handle say 004f3c or whatever.
so would i put PostMessage(WM_LBUTTONDOWN,004f3c,NULL);
Sorry but confused i kinda understand what your saying but its new to me so i'm kinda lost.
thanks for the help by the way.

Win32newb
"Making windows programs worse than they already are"