C / C++ / MFC

Re: True/High color toolbars

22-Mar-02 20:10

You can use CToolBarCtrl::SetHotImageList and CToolBarCtrl::SetImageList to set the double color 24 bit toolbars

Nish

Yeah that's me down below

alex.barylski22-Mar-02 20:43

alex.barylski

22-Mar-02 20:43

I just figured that out. Smile | :)

However i'm in need of something to do so I figure i'll tackle a custom 24 bit toolbar just for the heck of it.

Thanx Nish.

Is that your Johnny Denver...fever...??? what was it...?

Poke tongue | ;-P

Cheers!

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Re: True/High color toolbars

Nish Nishant22-Mar-02 20:55

22-Mar-02 20:55

HockeyDude wrote:
Is that your Johnny Denver

Johnny Bravo Smile | :)

Nish

Yeah that's me down below

CButton Color :: MFC

valikac22-Mar-02 17:42

valikac

22-Mar-02 17:42

Hi.

I would like to know how to change (repaint) a new color for a CButton object, both group and/or options.

For example:

...
CButton mBtnGreen;
...

mBtnGreen.Create("Green", WS_CHILD | WS_VISIBLE | BS_CHECKBOX
CRect(CPoint(0, 0), CSize(25, 50)), this,
IDC_BTNOPT_GREEN);

...

By default, the color of option (button) "Green" is light gray, like cream. I would like to change the color of the background of the button and/or text. By default, the text is black.

I tried repaint the entire client area, but MFC ignores the button areas.

Thanks,
Kuphryn

Re: CButton Color :: MFC

alex.barylski22-Mar-02 19:09

alex.barylski

22-Mar-02 19:09

1) ownderdrawn
2) Subclass

Chris has an article that should meet your requirements nicely.

Custom button

Cheers! Smile | :)

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

disk space of an object

Marcus Spitzmiller22-Mar-02 16:40

Marcus Spitzmiller

22-Mar-02 16:40

Anyone have any idea how to find how much space my CObject derived class is taking or will take up once its serialized?

I've serialized an object then manually written raw data at the end of the file. This works fine, but when I read it back, i figured I could serialize the object and pick up where the file pointer left off, but nope.

I forgot that CArchive allocates a buffer and reads in chunks so, i can't assume that the file pointer is immediately after the object i just serialized. Cry | :((

So, i need to find out what the actual disk space of my object is - any ideas?

Marcus Spitzmiller

"Ha ha, Stupid bloropope.." - Homer

Nish Nishant22-Mar-02 20:34

22-Mar-02 20:34

I seriously wouldn't advise that Marcus.
It's not a good idea.
You might end up corrupting the serialized objects

Nish

Yeah that's me down below

Marcus Spitzmiller23-Mar-02 4:17

Marcus Spitzmiller

23-Mar-02 4:17

Hmmm....I'm in a pickle, then.

Maybe you've tried this sort of thing, then. Basically I'm writing an object to a file as a header then appending various other files to create a large file. Basically, minus error checking:

fOut.Open(strFileOut,
File::modeCreate|CFile::modeWrite|CFile::shareDenyNone, &Error);

//the header
CArchive ar(&fOut, CArchive::store);
m_objInstrument.Serialize(ar);

//then i append the files
for(int i = 0; i < arFileNames.GetSize(); i++)
{
strFileName = arFileNames.GetAt(0);
arFileNames.RemoveAt(0);
fIn.Open(strFileName, CFile::modeRead, &Error))

dwLength = fIn.GetLength();
BYTE * pBuf = (BYTE *)malloc(dwLength);
fIn.Read(pBuf, dwLength);
fOut.Write(pBuf, dwLength);
fIn.Close();
free pBuf;

}
fOut.Close()

So you're saying this is a bad idea? Wait..I just noticed the CArchive::Write method...Interesting. I'm going to give this a try, but in the meantime if you have any suggestions, please feel free to let me know.

Marcus Spitzmiller

"Ha ha, Stupid bloropope.." - Homer

David Defoort22-Mar-02 23:23

David Defoort

22-Mar-02 23:23

Here is something you could try:

CMemFile file;
CArchive ar(&file, CArchive::store);
pYourObject->Serialize(ar);
ar.Close();
DWORD dwSizeOfYourObject = file.GetLength();
file.Close();

I haven't tried it, so may be this would give you a size that is a multiple of nGrowBytes (parameter of the constructor of CMemFile, 1024 by default). Confused | :confused:

Hope this helps,

David Defoort

Marcus Spitzmiller23-Mar-02 4:04

Marcus Spitzmiller

23-Mar-02 4:04

Thanks, David - I'll give that a go, and get back to you.

Marcus Spitzmiller

"Ha ha, Stupid bloropope.." - Homer

Stack problems

Steve Severance22-Mar-02 15:30

Steve Severance

22-Mar-02 15:30

what does this mean?
Run-Time Check Failure #2 - Stack around the variable 'Alt' was corrupted.

also what is a stack overflow really and how are they caused and prevented?

Thanks.

Steve

Not all who wander are lost...

lilei22-Mar-02 16:03

lilei

22-Mar-02 16:03

I do not know the answer to your first question.

stack overflow is when you run out of stack space in your process. They can be caused in a number of ways, but the reasons including calling a recursive function that recurses until there is no more stack space, a bad message loop is created and an endless number of function calls are created until there is no more stack space. Your stack pointer gets corrupted.

Why they are really bad is that each time you call a function, it creates a stack frame at the current stack pointer (SP). All of the stack variables that are created in your function are allocated on the stack as well as the parameters that are passed into the function. If you run out of stack space, then you lose the ability to make function calls and allocate stack varaibles.

Tim Smith22-Mar-02 17:07

Tim Smith

22-Mar-02 17:07

Basically it is a new feature in VC7.

Let us say that Alt is a 10 byte character array. (char Alt [10]). If you write to the 11th byte, you will get this error.

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

Nish Nishant22-Mar-02 20:30

22-Mar-02 20:30

Wow

That's indeed a cool feature.
Its amazing it wasnt there in VC 6.0.
We dont usually think of corrupted stacks.

Nish

Yeah that's me down below

Tim Smith23-Mar-02 4:13

Tim Smith

23-Mar-02 4:13

There are 3 new debugging options that are nice. (But slow)

/RTCc - Checks for loss of precision. (i.e. char a = 10000)

/RTCs - Initialize local variables to non-zero. Detect over-runs and under-runs of arrays on the stack. Stack pointer verification (i.e. calling a __stdcall routine using __cdecl which has totally different stack requirements.)

/RTCu - Reports when a variable has been used prior to initialization. This is a run-time check and not compile time.

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

C2440

22-Mar-02 14:17

C:\Windows\Desktop\Project3\Partition.cpp(178) : error C2440: 'type cast' : cannot convert from 'int (__thiscall Partition::*)(void)' to 'int'
Conversion is a valid standard conversion, which can be performed implicitly or by use of static_cast, C-style cast or function-style cast

int MemoryManager:: searchList(int pID)
{
	LinkedList<partition>* current;
	LinkedList<partition> first = Li.info();
	current = &first;
	Partition tempPartition = current->info();
	while((current != NULL) && (((int)tempPartition.getProcessID) == (int)pID))
	{
		current = current->next();
	}
	return 0;
}
<\pre>

could anyone tell me how do i fix this thank you.

Re: C2440

Nish Nishant22-Mar-02 14:23

22-Mar-02 14:23

What's all this Partition stuff?
STL or something???

And which line is 178 here???

Nish

One Nish is trouble enough.
Imagine 16 of me, dancing wild...
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:

Re: C2440

22-Mar-02 14:34

int MemoryManager:: searchList(int pID){	LinkedList* current;	LinkedList first = Li.info();	current = &first;	Partition tempPartition = current->info();/*178*/	while((current != NULL) && (((int)tempPartition.getProcessID) == (int)pID))	{		current = current->next();	}	return 0;}
<\pre>
the Partition class is a class that i defined myself.

Re: C2440

Nish Nishant22-Mar-02 14:43

several Threads.....trying to access same array item

22-Mar-02 14:43

Is this where you get the casting error :-

(((int)tempPartition.getProcessID)

If so what is getProcessID?
If it is a function that returns an int write it as getProcessID(). Because when you write it as getProcessID without the '(' and the ')' you are passing a pointer to the function

Nish

One Nish is trouble enough.
Imagine 16 of me, dancing wild...
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:
:jig::jig::jig::jig:

22-Mar-02 14:01

Hi,
I have a question about multithread.

Let say there is an array called DBObject[100], and my thread function need access to this array. All threads are required to get a "permit" from the main function, so that this thread can have permission to access the particular data item in array.

Permission will be granted IF DBObject[i]= "free"

Let say:
Thread A: 1. Ask for permission to change DBObject[10] -> "X"
2. If permission receive ---- (DBObject[10]= "free"),
then change DBObject[10] -> "X"
3. Else, wait until DBObject[10]="free"

Thread B: 1. Ask for permission to change DBOject[10] -> "Y"
2. If permission receive ---- (DBObject[10]= "free"),
then change DBObject[10] -> "Y"
3. Else, wait until DBObject[10]="free"

(basically, they are using the same thread function.....)

My question is: Is it possible that both thread A and B can read the DBObject[10]="free" at the same time and therefore, think that they have permission to access DBObject[10] and change the DBOject[10] value at the same time. (if it's happened, then i don't know what will happen......)

p.s.: (the point (1), (2) and (3) are stored in a normal function (not thread), and those thread function just calls this function with some parameters);P

Please help!!!!!!!!!

Re: several Threads.....trying to access same array item

Nish Nishant22-Mar-02 14:13