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I have played with all the project setting that I dare and nothing changes the fact that an empty if statement is causing me problems.
You won't believe how embaressed I was today when my boss asked for a demonstration. The whole thing came to a standstill simply because data could not be merged.
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I would really think that the compiler is doing this to you. Set the optimization to DEBUG on your release build and rebuild everything.
Are you stepping through this with the debugger?
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Hi All,
Can any one explain the behavior/output of following piece of code.
// TestApp.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "conio.h"
class B
{
private:
int i;
public:
B()
{
i = 10;
}
void fun()
{
printf("%s","Called\n");
}
};
class A
{
private:
A(){};
public:
static B *b;
static void intializeStatic()
{
A::b = new B();
}
};
B *A::b = NULL;
int main(int argc, char* argv[])
{
A::b->fun ();
printf("Hello World!\n");
getch();
return 0;
}
Output:
Called
Hello World!
Please Help
Thanks In Advance..
Suraj Gupta
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Is this a quiz, or do you have a specific question? What are you having trouble with?
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Gupta Suraj wrote: Output:CalledHello World!Please HelpThanks In Advance..
you are calling static function of the class A, is that your problem
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yang__lee wrote: hen class A's constructor is private.It can not be instantiated.
have you ever read about usage of static variable in class or singleton pattern
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Hi,
I am writing a report at the moment and I just wanted to ask for any tipps? I also actually hae a question...if I am writing about a function in the code and giving code snippets is it a good idea to just give the general form of that function, ie
" And then I used the function CWnd::AfxRegisterClass(Give Parameters) and the syntax is as follows"
or should I write just ...and then I used the AfxRegisterClass method? And then for code snippets...should I use the "general form" or the one from the code where I actually use instances of variables etc. Sorry if this unrelated and slightly confusing but just thought I might ask here cause just want the clearest way of doing things.
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Just one suggestion. Think about who your report is targeted towards. If beginners then yes, it would be good to refrence the full function name and paramaters, if intermediates, then no. Also for some rarely used functions, and the not so obvious ones, it would be good to hyperlink them to the relevent MSDN page.
Nomatter who it is targeted towards, make sure your code snippets are well commented.
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hi!
I've got this CString : "454628000211119369041932" which I want to convert into a long long int(64 bits). I try with atoi but the string is too big! Anybody have an idea how this be done? The reason why I need this is to add this number to an other smaller one.
thanks !!
-- modified at 12:00 Friday 7th April, 2006
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_ttoi64() function should do the trick. Assuming that the string value is within the 64bit type range.
<EDIT>
and looking at your string, I can see that the number actually exceeds the range of a 64bit integer.
<EDIT>
I Dream of Absolute Zero
-- modified at 12:13 Friday 7th April, 2006
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cool thanks! But I think my number is over range...I'll check it out!
thanks for answering
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BigDan34 wrote: I think my number is over range...I'll check it out!
OT, where do you required such a big number
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This is for a cryptographic work. I've got a very big encryption key and I need to add this key to an other one...pretty bad  We have check it out with the projet manager and finaly we the key
thanks anyway
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Hi all
I have such situation :
dwordValue = Byte1 Byte2 Byte3 Byte4
I want to write function foo(DWORD &x) and when I call
foo(wordValue)
I want dwordValue to be like this :
dwordValue = Byte2 Byte3 Byte4 Byte1
-- modified at 12:24 Friday 7th April, 2006
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Unless I'm seriously mistaken, a "word" is two bytes long, not four.
Here's a technique you could use, although it is not the only one:
BYTE* BytePointer = (BYTE*) &wordValue;
BYTE Byte1 = BytePointer[0];
BYTE Byte2 = BytePointer[1];
BYTE Byte3 = BytePointer[2];
BYTE Byte4 = BytePointer[3];
INT ReversedValue = 0;
BytePointer = (BYTE*) & ReversedValue;
BytePointer[0] = Byte2;
BytePointer[1] = Byte3;
BytePointer[2] = Byte4;
BytePointer[3] = Byte1;
Hope this helps,
Rich
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Troposphere wrote:
Unless I'm seriously mistaken, a "word" is two bytes long, not four.
He's using a DWORD which is four bytes.
"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain
"There is no death, only a change of worlds." - Native American Proverb
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DavidCrow wrote: He's using a DWORD which is four bytes.
Look again, the post was modified. In the original post, it said simply "word", not "DWORD".
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Hello. I wrote a dll for use with a VB front-end. The DLL runs mainly in a while loop which takes full control over the one thread VB allows, which ultimately freezes the VB form. I was wondering if adding multi-threading to the DLL would help. Theorhetically, I would think that it might. For example, VB App loads DLL in one thread, DLL creates new thread for while loop processing, thus the VB form should be able to function.
Here would be an example of my DLL layout:
while() {
for() {
if () {
}
}
}
So, I suppose I would need to through the entire while loop in its own thread, but I have no idea how. I have never multithreaded before, so I would really appreciate an example, if possible.
I thank you in advance.
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First, it would help if you specified what VB you are talking about, VB6 or .NET.
Second, it strikes me as extremely poor design to use a continuously looping thread. For such a thing, one usually uses a design that uses wait functions and alertable threads.
Why don't you describe what kind of processing the thread is actually doing, and I'm sure there is some way to redesign it so that it works better.
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I am using VB6. As of now, the while loop is non-alertable, but will be before I am through. But, would be open to an example of that as well. However, that was an intention before the release. The thread is processing packet data as it comes off the wire. I need it to continously loop until user says stop.
let me know if you need more info. thanks in advance.
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borono wrote: The thread is processing packet data as it comes off the wire.
Well what do you mean by "the wire?" Is the thread talking directly to a device driver? Are you referring to TCP/IP sockets? There are numerous examples of how to accomplish overlapped I/O with TCP/IP sockets.
The theory with overlapped I/O, is that you create a worker thread that enters a wait state, waiting for data to arrive on one or more sockets. When the system alerts the thread that data has arrived, then the thread wakes up, and performs the necessary processing.
Just look up Overlapped IO in the MSDN. If you have questions about implementing it in your DLL, I and many others on this board can help you with that.
Rich
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thats what I have now, the thread sits in a wait state waiting for data. I am talking directly to the device. I just can not stop it altogether at this point, without totally killing the process. I figure I can do this. I can create another vb project, solely to load my dll for capturing and that should work. However, I would rather do it properly with multiple threads.
How would I through the entire while loop in its own thread separate from the main thread, in my dll?
thanks in advance.
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Well, the easy way out of your problem would be to call CreateThread in your DllMain function, so that your device polling happens on this second thread, and your main thread is free to return to the VB form.
DWORD ThreadId = 0;
HANDLE ThreadHandle = CreateThread( NULL, NULL, ProcessingFunction, lpParameter, NULL, &ThreadId );
Then your processing function would be declared as follows:
DWORD WINAPI ProcessingFunction(
LPVOID lpParameter
);
Just put all your processing code into the ProcessingFunction, and you will have it running on a separate thread. But you will be responsible for communicating to the second thread when it needs to quit.
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Oh no, now I am lost. Bare with me, I am currently sitting with two-ply jammed up both nostrils, sick as a dog, trying to keep up with you. Plus, this is all new knowledge to me, so I of course have questions.
With:
DWORD WINAPI ProcessingFunction(LPVOID lpParameter);
Would it go into my function:
char* _stdcall cap(char *adp) {
//place here
}
...?
Also, I don't have a DLLMAin function, because I thought it was not necessary when calling the DLL from VB. Is it alright to create one? Not sure how it looks.
Plus, doesn't the API cause leaks? I would rather avoid that, if possible. Doesn't look like I will be multi-threading anytime soon. So, here is another question, perhaps easier to explain. I also need to send the stats back to the VB app... how can I do that without sending a return, which ends the entire function. I just want to know how many protocols have been identified while capturing, without killing the entire thing. I'm not even going to guess, I have no idea what to do.
sorry for the slow comprhension rate today, I am normally quicker than this.
best regards
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borono wrote: Also, I don't have a DLLMAin function
Did you write this DLL? What language was used to write the DLL?
borono wrote: Plus, doesn't the API cause leaks?
What kind of "leaks" are you talking about? And NO, the API by itself does not cause memory leaks.
If you want to create additional threads, you are going to have to use the Win32 API. I don't know of any way in VB6 to create additional threads.
borono wrote: I also need to send the stats back to the VB app
For this, I would suggest looking up how to implement something called a "callback function" in your VB6 app. Then have the thread in your DLL periodically call the callback function with the necessary data.
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