C / C++ / MFC

19-Jul-12 23:47

Today I developed an application that generate EAN-13 Barcode. around 166 bar code is being generated and printed in two pages.

Now the problem I am seeing is operation is slow and heavy. It Sends 17.24 Mega Bytes of data to printer to print. And the entire process is really slow.

here is the steps to do so:

C++

//I am not going through all the detail. If this code does not help you then let me know.
PrintDlg(...)
StartDoc(...);
StartPage(...);
// a process to create and draw the image on hdc using 
// i got an application available in CodeProject. 

DrawText(...);//to draw the number at the bottom of the barcode
EndPage(...);
EndDoc(..);

Now the problem is data is too much for two page.
But even an 8 page mistake print is so fast that it ends printing before I reach to printer to stop. What's wrong with this way? more over is there a better way? or too much ink?

Eugen Podsypalnikov20-Jul-12 0:41

Eugen Podsypalnikov

20-Jul-12 0:41

What perfomance is in case of two pages
and one code-image per page, please ? Smile | :)

They sought it with thimbles, they sought it with care;
They pursued it with forks and hope;
They threatened its life with a railway-share;
They charmed it with smiles and soap. Smile | :)

Mohibur Rashid20-Jul-12 1:26

20-Jul-12 1:26

Thanks for your time,

In loop I create the image and add it to the page through HDC. Thus it create 168 Barcode is generated. and they are all in two pages only.

Now I am start to think may be the barcode creating process is not fast enough

Eugen Podsypalnikov20-Jul-12 1:35

Eugen Podsypalnikov

20-Jul-12 1:35

Can you reduce the loop down to 1 move per page
and then check the time difference ?

Or trace a page "ready" event by the call of:
::MessageBox(NULL, _T("A page done"), _T("How long ?"), MB_OK);
before ::EndPage(..)

Also, the printer DC could be prepared by "1 bit-per-pixel" bitmap
and maybe by smaller "DPI" value... Smile | :)

They sought it with thimbles, they sought it with care;
They pursued it with forks and hope;
They threatened its life with a railway-share;
They charmed it with smiles and soap. Smile | :)

modified 20-Jul-12 7:45am.

Mohibur Rashid20-Jul-12 2:19

20-Jul-12 2:19

I already did, it takes 3 munites

Mohibur Rashid23-Jul-12 14:51

23-Jul-12 14:51

I already rewrite the application. its working better

Eugen Podsypalnikov23-Jul-12 19:45

Eugen Podsypalnikov

23-Jul-12 19:45

Still 17 MBs will be sent ? Smile | :)

They sought it with thimbles, they sought it with care;
They pursued it with forks and hope;
They threatened its life with a railway-share;
They charmed it with smiles and soap. Smile | :)

Mohibur Rashid24-Jul-12 23:36

24-Jul-12 23:36

I think it would. I didn't check it yet though. But I think it would, but because it creates raw data for printing, and it creates a bit mapped image of 6600x5100 size. but I know that the the data transfer will be faster than the last time

why 6600X5100
This printer is capable of printing 600 points in one inch and I didn't intend to change it.

Richard MacCutchan20-Jul-12 1:05

20-Jul-12 1:05

Mohibur Rashid wrote:
i got an application available in CodeProject.

You should try posting your question in the forum at the end of the article so the author sees it.

One of these days I'm going to think of a really clever signature.

Mohibur Rashid20-Jul-12 1:27

20-Jul-12 1:27

Thanks for your time,
I should ask this. May be barcode generating process is slow

Richard MacCutchan20-Jul-12 1:49

20-Jul-12 1:49

Mohibur Rashid wrote:
May be barcode generating process is slow

It depends on your code and your printer. I have my own barcode print routine which is fast enough for my purposes.

One of these days I'm going to think of a really clever signature.

Mohibur Rashid20-Jul-12 2:24

20-Jul-12 2:24

I watched it all. the data transfer is slow. But network is not slow. It actually take time to transfer data. The printer is high performance printer. I need to calculate how much time it takes time to generate single barcode

Richard MacCutchan20-Jul-12 2:52

20-Jul-12 2:52

Mohibur Rashid wrote:
I need to calculate how much time it takes time to generate single barcode

If you mean inside your code then that's easy, just take the time at the start and end of your print process. If you mean from the PC to the printer I do not know of any simple method. Also different printers operate in different ways with regard to when they start printing relative to when the print data arrives.

One of these days I'm going to think of a really clever signature.

Mohibur Rashid23-Jul-12 14:50

Windows has triggered a breakpoint in exe.......

23-Jul-12 14:50

Yeah, the program sucks. I re-write the entire code, took few hours. working fine and fast

Andraw11119-Jul-12 9:01

Re: Windows has triggered a breakpoint in exe.......

19-Jul-12 9:01

Hi, dear all,

I create a DLL that will apply calculation.

class __declspec(dllexport) Class1{}

class __declspec(dllexport) Class2{}

class __declspec(dllexport) Utility{

static Class1* CreateCase1Obj(){
Class1* obj = new Class1();
return obj; }

}

Other application will use the Utility to get Class1 object as the following:

Class1* obj = Utility::CreateCase1Obj();

The error happens inside CreateCase1Obj() function while call "return obj;" and browser points to dbgheap.c file.

Can anybody tell me what cause this error? Thanks!

Albert Holguin19-Jul-12 9:12

Albert Holguin

19-Jul-12 9:12

Probably crashing because you're attempting to create a class from code you never imported.

Re: Windows has triggered a breakpoint in exe.......

Andraw11119-Jul-12 9:56

Re: Windows has triggered a breakpoint in exe.......

19-Jul-12 9:56

Thanks for your reply.

In my project's cpp file from where I will call function from DLL, I add the following lines at the file top:

__declspec(dllimport) class Class1;
__declspec(dllimport) class Class2;
__declspec(dllimport) class Utility;

but still get the same error.

Andraw11119-Jul-12 10:58

Re: Windows has triggered a breakpoint in exe.......

19-Jul-12 10:58

I test the program, the reason for the error is that I pass std::string as argument to Class1 constructor.

Class1(std::string arg1, std::string arg2){
this.ProjDir = arg1.data();
this.ProjName = arg2.data();
}

calling side:

std::string dir = ".....";
std::string name = "....";

Class1 obj = new Class1(dir name);

I test if I call empty constructor, it's fine.

What should I do now? I need to pass these value to Class1.

Richard MacCutchan19-Jul-12 22:24

Re: Windows has triggered a breakpoint in exe.......

19-Jul-12 22:24

Try using the c_str()[^] member function to get the data from the string parameters.

One of these days I'm going to think of a really clever signature.

Andraw11123-Jul-12 3:44

Re: Windows has triggered a breakpoint in exe.......

23-Jul-12 3:44

Richard, thanks for your suggestion.

Yes, if in the calling side I pass string.c_str() value
string xx = "calling...";

func(xx.c_str());

and in the function definition side I define function as:
func(const char* str){}

everything is fine.

But my project has hundreds functions, it was created in C++ 6.0, now I wish to migrate it to VS2008, if I have to modify all the function definition and modify all the places to function call, that's a big work.

Is there any better way to solve this issue? Thanks!

Richard MacCutchan23-Jul-12 4:30

Re: Windows has triggered a breakpoint in exe.......

23-Jul-12 4:30

I do not know of any simple way other than "Find & Replace in Files" (Ctrl+Shift+H). It's a pity that you created the functions to accept char* parameters rather than string object references, then you would not have had to change in so many places.

[edit]
It is, of course, always possible, that the 'bug' in your code will not be fixed by these changes, but is connected to something else. Make sure that you are actually fixing the right problem before you make all these changes.
[/edit]

One of these days I'm going to think of a really clever signature.

Andraw11123-Jul-12 5:36

Re: Windows has triggered a breakpoint in exe.......

23-Jul-12 5:36

I am testing to pass std::string by reference instead of std::string, it works fine. so in this case, all I need to do are modify all the function siguratures with std::string as argument, that saves a lots of time.

Thanks!

Richard MacCutchan23-Jul-12 5:45

Re: Windows has triggered a breakpoint in exe.......

23-Jul-12 5:45

I also just noticed that in one of your earlier posts you are using std::strings for string constants. This is a waste of time as you are just adding extra code to copy the constant character value into a std::string in order to pass it to some function.

One of these days I'm going to think of a really clever signature.

Andraw11123-Jul-12 6:24