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Hi All,
I am facing a serious issue while command line compilation of VC6 COM dlls.
My application will compile several dlls one by one using MSDEV.exe. After compiling some dlls, application will hang on due to indefinite waiting in Registration process of compilation. It will not specific to one particular dll, some times same dll will compile another time it will struck.
It is very much killing me, what might be reason?
If any one have any idea what may be the issue, Please share with me.
Thanks in advance.
Kind Regards,
Sreeram
T.sreeram Murthy
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Hi, I am facing a crash while calling the function CreateWindowEx ,
Here is the code piece i am using.
WNDCLASSEX WndClassEx;
memset( &WndClassEx, 0,
sizeof(WNDCLASSEX) );
WndClassEx.lpfnWndProc = AVThreadMessageProcedure;
WndClassEx.hInstance = (HINSTANCE)g_hModule;
WndClassEx.lpszClassName = AVTHREAD_WINDOW_CLASS;
WndClassEx.hIcon = hIcon;
WndClassEx.hIconSm = hIconSmall;
WndClassEx.cbSize =
sizeof(WndClassEx);
CreateWindowEx( 0, AVTHREAD_WINDOW_CLASS, L
"", 0, 0, 0, 0, 0, HWND_MESSAGE, NULL, (HINSTANCE)g_hModule,(LPVOID)this );
Here I am passing the pointer of the calling class in last argument. Application is not crashing always but some time it crashed at this point.
Can you please give some idea about what wrong i am doing here.
Thanks in advance.
Birajendu
SonicWALL
Bangalore
India
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Where is the RegisterClassEx() called? 
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Yeah, ofcourse that is being called successfully with out any error.
Birajendu
SonicWALL
Bangalore
India
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May be some problem with the AVThreadMessageProcedure() function? Did you try putting a break point int that function and debug?
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Could you tell us the exact error message ? Where does it crash exactly ? Try to use your debugger to collect more information.
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I can't figure out how to read a files summary (Title, Subject, Author, Category, Keywords, Comments, etc.. The tab under properties).
If anyone could show me how to do this you would make my day 
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Can anybody tell me why value of b is 3 in this code? what happens with (a=0) exactly?
int a=0;
int b=(a=0)?2:3;
cout<<b;
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Because the statement within parenthesis, which assigns 0 to a, equates to 0 (false), thus assigning 3 to b. If you change it to:
int b = (a = 1) ? 2 : 3; it might make more sense.
"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
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DavidCrow wrote: change it to:
int b = (a = 1) ? 2 : 3;
it might make more sense.
Does it really make more sense?
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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In that it would instead assign 2 to b, yes.
"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
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Ah, OK, it makes a lot more sense... 
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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The result of the expression (assignment)
(a=0)
is 0, i.e. the value of a (that is false for the conditional operator ?).
hence the result of the expression
VCD_A wrote: (a=0)?2:3
is 3.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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a=0 is assignment. You probably wanted a==0 (two = signs), which is hte equality test.
One of the things that's nice (when you're experienced), yet horrible (when you're learning) about C and C++ is that assignment is an expression, not a statement, which means that you can do what you've done there.
In other languages like Ada, which class assignment as a statement, you couldn't make that mistake.
Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p
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but if your are assigning any thing to any variable(in our case a=0), this statement suppose to a true, and a=1 does, but what is wrong with zero?
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In C (and C++) 0 equates to false and non-zero equates to true.
The case that you mentioned is similar to
int a = 0;
if (a)
{
b = 2;
}
else
{
b = 3;
}Since a is 0, this equates to if(0) or if(false).
So the else part will be executed.
But in the following snippet, the if part will be executed.
int a = -1;
if (a)
{
b = 2;
}
else
{
b = 3;
}
«_Superman_»
I love work. It gives me something to do between weekends.
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The result of assignment is the value that was assigned to the lvalue, not some sort of status flag indicating that the assignment succeeded. The result of a=x is x, thus a=0 equals 0.
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VCD_A wrote: but if your are assigning any thing to any variable(in our case a=0), this statement suppose to a true...
So what would you propose the value of a and b to be in the following:
int a, b, c;
a = b = c = 5; Hint: it's not 1.
"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
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Hello,
I want to obtain desktop background, so I would like to use PaintDesktop(hdc) function;
SDK says:
The PaintDesktop function fills the clipping region in the specified device context with the desktop pattern or wallpaper
HRGN hReg = CreateRectRgn(0,0,10,10);
HDC hdcD = GetWindowDC(GetDesktopWindow());
hdc = CreateCompatibleDC(hdcD);
SelectObject(hdc,hReg);
bResult = PaintDesktop(hdc);
But PaintDesktop function always returns false.
What am I doning wrong? Could you give me a hint.
Thank you.
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Why don't you call GetLastError on PaintDesktop failure?
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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or if you're lazy, add @err,hr to your watch window
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Can anyone help me with example code where u can use (vector, queue, dequeue , map techniques)
Thanks Stuart Dootson &; Superman !
I will be receiving certain amount of packets but I am not sure exactly how much. There will no memory problem as certainly its being taken under consideration that the received packets will be at certain limit it will not exceed.
whats the difference between using vector versus dequeue or queue technique.
I am explaining my scenario . I have reader thread that will do blocking read and once it receives the first packet which will be of 20W with 1W header with it.. I need to calculate checksum of the 20W packet received. Than I need to read certain fields and need to decide where it needs to be buffered. Before buffering these packets I need to strip off the 1W header. Once the buffering is complete say I might receieve 500 packets of size 20Word. After I stop receving the packets. I need to analyze the packets that being buffered. And these packets are of 2 types theere might be 2W packet and 260W packet or partial packet and each of these packet will have header so. first I need to read the packet header of the first received packet inthe buffer and base don that I need to dispatch those packets to its destined location or hand over to the designated handler.
So confusion is whats the best efficient technique I should use. Using simple array is not best option so thought of asking here. Also how do Istrip off the header from the packet.
Any help woul dbe appreciated. I have just started coding but have not really much coded in C++ .. I am learning by dng google or reading previos discussion here on forum
THANKS!!!!
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You should probably use deque. In my opinion it would be best suited for your application requirments. A Microsoft sample of deque:
INFO: STL Sample for deque::push_back and deque::pop_back Functions[^]
A in-depth deque analysis by a codeproject member:
An In-Depth Study of the STL Deque Container[^]
resolvequestion wrote: whats the difference between using vector versus dequeue or queue technique
This is not really the type of information that is obtained through a forum. You should probably invest a few hours and research the difference between the STL containers. Here is a good place to start:
STL Container Comparison[^]
STL Containers[^]
resolvequestion wrote: Also how do I strip off the header from the packet.
WORD packet_buffer[20];
WORD packet_head = packet_buffer[0];
WORD *piStripped = &packet_buffer[1];
BYTE *pbStripped = (BYTE *)&packet_buffer[1];
resolvequestion wrote: Any help woul dbe appreciated. I have just started coding but have not really much coded in C+
Excellent, in my opinion codeproject is the best programming resource on the internet.
Good luck,
-David Delaune
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resolvequestion wrote: whats the difference between using vector versus dequeue or queue technique
Each of the STL containers are optimized for certain types of operations.
Read more about it here - STL Containers[^]
For example, vector is optimized for random access to any of its elements.
A deque is optimized for insertions and removal of elements at both its ends.
As suggested by Stuart in your earlier post, a deque will be perfect for your needs.
«_Superman_»
I love work. It gives me something to do between weekends.
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