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It is really a troublesome bug, many people can't bother it and saying it is so big a bug of MICROSOFT.
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Hi,
I'm converting a project originally written in VC++ 5.0 using MFC. This framework tends to use the uppercase BOOL, TRUE and FALSE for boolean type. The later frameworks include the lowercase bool, true and false as the boolean type. You can't use them together or you will face compiler warnings about performance drop due to converting.
So the question is simple: What to use?
Whats the difference?
Wich is better, and on what field?
Regards,
Kurt Pattyn
codito ergo sum
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small 'bool', its a primitive data type like int,char..etc and accepts only 0 and 1 ... anything above 1 say..2,3,4 taken as 1 only.
BOOL is basically of int type so accepts any values other than 0 and 1..
i think its better to use bool.
hey this is my finding!!.. wait for better responses..
V
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BadKarma wrote:
Whats the difference?
bool is a type builtin C++ (standarized) and BOOL is defined by Microsoft and it's an int (defined in 'windef.h'). An important difference is their size: if you perform a "sizeof" for a bool, it's 1, and in a win32 platform a BOOL has 4 bytes.
BadKarma wrote:
So the question is simple: What to use?
Depends on what you need, if you need something more portable or just a binary variable I'd choose bool if you need a wide range of values then BOOL.
BadKarma wrote:
Wich is better, and on what field?
I prefer bool because it's a c++ standard and when I need a wide range of values I use an int.
Marc Soleda.
... she said you are the perfect stranger she said baby let's keep it like this... Tunnel of Love, Dire Straits.
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marcdev wrote:
...if you need a wide range of values then BOOL.
By its very definition, a boolean variable only has two values: 0 and 1. Anything beyond that and you no longer have a boolean variable.
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
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Yep !!! Completely agree 
... she said you are the perfect stranger she said baby let's keep it like this... Tunnel of Love, Dire Straits.
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In theory yes, but in practice no. Anytime you are using a non-Boolean to represent a Boolean value, you have to be careful how you test for TRUE or FALSE. For example "if (x == TRUE)" is a VERY bad idea since it yields different results than "if (x)".
Now using this information that a BOOL can have four billion different values and returning more results than just TRUE(!=0) or FALSE(==0) is a bad bad thing. (Which is the case I am sure you are referencing.)
Tim Smith
I'm going to patent thought. I have yet to see any prior art.
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well actually you can convert them.
The main difference is that a BOOL is actually an integer (4 bytes I think) and TRUE and FALSE are defined values to 1 and 0 respectively.
a bool is a class I think, where the data integrety (true/false) is forced more then the BOOL datatype.
(a little warning: bool can have a sort of tri-state, never use something like the following:
bool mybool;<br />
<br />
<br />
if(mybool == true){
}<br />
else{<br />
}
but use
if(mybool){
}<br />
else{<br />
/code<br />
}
)
both types are used often. BOOL is especially used on structures like:
BOOL myBOOL;<br />
<br />
if(myBOOL == TRUE){<br />
<br />
}<br />
else{<br />
if(myBOOL == 3){<br />
<br />
}<br />
else{<br />
}<br />
}<br />
}
I'll leave it up to you whether you find this good or bad design.
I hope this helps you a bit.
good luck!
No hurries, no worries.
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In your MFC code, stick to BOOL. For everything else (within reason), move towards bool.
Tim Smith
I'm going to patent thought. I have yet to see any prior art.
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100% agreed. And never compare a BOOL to TRUE, only check if it is FALSE or not. Since anything that is not FALSE is TRUE.
INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen
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I want to write a Visual C++ program which gets data from the user and gives this data to GAMS (on a simple button click and GAMS should not run visibly). GAMS is then supposed to make a calculation and give the obtained data back to my Visual C++ program so that I can use this new data. Does anybody know if this is possible???? And if so, then how should I do this? THANKS in advance.
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Two type definitions are used in borZoi can anyone explain it to me.
1.typedef unsigned char OCTET;
This represents an unsigned 8 bit type. It is called octet rather than
byte in order to be consistent with the various standards.
2.typedef std::vector<octet> OCTETSTR;
This is a vector of octets and represents an octet string as described in various standards.
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What's the question? 
"God doesn't play dice" - Albert Einstein
"God not only plays dice, He sometimes throws the dices where they cannot be seen" - Niels Bohr
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using typedef allow you to define synonyms.
you use it just as you would define a variable of that type, but the name of the variable is the synonym name...
<font color=green>
<font color=blue>typedef unsigned char</font> OCTET;
<font color=green>
<font color=green>
<font color=blue>typedef</font> vector<OCTET> OCTETSTR;
TOXCCT >>> GEII power
[toxcct][VisualCalc]
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by definition an octet is 8 "something".
octet is the (better) french translation of a byte; maybe the original programmers were french.
as for the other one, maybe we're missing < >
Maximilien Lincourt
Your Head A Splode - Strong Bad
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we want to transefer one file from one pc to another.
please give me code in VC++.
when we run any Windows program in VC++ linking error was arise.
error was like . unresolved symbol : _beginthreadex
unresolved symbol : _endthreadex
in some library file.
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manishgandhi wrote:
when we run any Windows program in VC++ linking error was arise.
error was like . unresolved symbol : _beginthreadex
unresolved symbol : _endthreadex
in some library file.
I Believe you forget to Enable MFC in your Project!
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
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manishgandhi wrote:
we want to transefer one file from one pc to another.
please give me code in VC++.
How? RS-232, tcp, ... ?
manishgandhi wrote:
when we run any Windows program in VC++ linking error was arise.
error was like . unresolved symbol : _beginthreadex
unresolved symbol : _endthreadex
That's bcause you are compiling with /MT flag activated (multithread option)and your libc.lib seems that it doesn't support it. Do you have this library? Read this[^] for info.
Marc Soleda.
... she said you are the perfect stranger she said baby let's keep it like this... Tunnel of Love, Dire Straits.
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I am currently wokring on the server side applications of the project and i am using Visual Studio .NET and MFC to develop the server side applications. As for the server's user interface i am using MFC and my server's side user interface will receive the summary page from the client which is send by the customer using the Pocket PC to send the summary page. The summary page is the finalised orders made by the customers and it consists of the name of the food ordered, number of drinks, what type of desserts and including the special orders made by the customers. I am actually doing a project on the ordering of foods and my part is responsible for receiving the summary page which is the finalised food orders from the customers using the Pocket PC and my difficulties is how to program some intelligence in the server so that for eg .it can calculate the accumulated orders of the total of how many plates of chicken chops are ordered and how many drinks and dessert are ordered, pls help me i am really stuck!! yr help is very much appreciated
Claude
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hi,
i have a MDI doc, in that i want the child frame to be able to move outside the main frame work-area when its restored, and when its maximized it shud fit the mainframe's work-area(ie, it shud maximize inside the mainframe)
ss
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If it can move outside the main frame, then it is (probably) not a child of the main frame.
I am not saying it is not possible (you'll have to step outside of MFC to do it), but you have have just step into the twilite zone.
INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen
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I wrote a program to send a file over rs233.
When I send a text file, it works correctly.
But When I send a Binary File It does not work correctly.
Because It assumes reach '\0'.How Can I send any File Correctly via serial port?
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What are you using to read and write the file on each end? Are you indicating the the binary mode when you open each file?
--
jlr
http://jlamas.blogspot.com/[^]
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Could any one please help me out in adding X button in right corner in tab ctrl and a show a spliter window in tab ctrl.
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I was looking for the same, found a solution?
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