Re: SetDIBitsToDevice problem - C / C++ / MFC Discussion Boards

hema_soft8-Dec-09 23:30

8-Dec-09 23:30

When u create base class pointer as derived class using new, it first allocate memory for base class one by one, call their constructors, initialize their member variables , finally it call declared class constructor(here it is Class C). since fn s() is called in class A's Constructor, it invoke its own fn even though u declared it as virtual.
A *ptr = new C();

if you define like this ,
A *ptr = new C();
ptr->s();

Class C's fn of s() will be invoked!

hemmalatha.g

Re: Dynamic Dispatch

Stuart Dootson9-Dec-09 0:04

Stuart Dootson

9-Dec-09 0:04

When constructing an object, base class constructors use that base classes virtual function table. So, when you call C's constructor, the first thing it does is call B's (implicitly defined) constructor, which call's A's constructor. Within A's constructor, only virtual functions defined in A can be called. Within B's constructor, only virtual functions defined in A or B can be called. Within C's constructor, virtual functions defined in A, B or C could be called.

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Twain endorse text

sujtha8-Dec-09 22:26

sujtha

8-Dec-09 22:26

Kindly let me know, how to use endorsement option in the scanner using twain

Re: Twain endorse text

Rajesh R Subramanian8-Dec-09 22:36

Rajesh R Subramanian

8-Dec-09 22:36

This is the C++ forum.

“Follow your bliss.” – Joseph Campbell

Twain endorse text [modified]

hema_soft8-Dec-09 23:02

hema_soft

8-Dec-09 23:02

I use twain.h in vc++ application for scanner operation. twain.h file contains n number of capabilities (like CAP_DUPLEXENABLED,ICAP_XRESOLUTION,ICAP_AUTOMATICROTATE etc) which are supported by scanner. kindly help me how to use CAP_ENDORSER and TWEI_ENDORSEDTEXT capabilities to do endorsement in the scanner.

sujtha

modified on Wednesday, December 9, 2009 5:13 AM

SetDIBitsToDevice problem

sashoalm8-Dec-09 21:12

sashoalm

8-Dec-09 21:12

I have this code that loads a DIB bitmap from a file and passes it to SetDIBitsToDevice.

This code works:

FILE* f = fopen(".\\bitmap1.bmp", "rb");

vector<BYTE> buffer;
buffer.resize(_filelength(f->_file));
fread(&buffer[0], buffer.size(), 1, f);
BITMAPINFO* bminfo = (BITMAPINFO*) &buffer[14];
BITMAPFILEHEADER* bmh = (BITMAPFILEHEADER*) &buffer[0];
LPVOID bits = &buffer[bmh->bfOffBits];

SetDIBitsToDevice(
    pDC->GetSafeHdc(),              // handle to device context
    0,                              // x-coordinate of upper-left corner of
                                    // dest. rect.
    0,                              // y-coordinate of upper-left corner of
                                    // dest. rect.
    bminfo->bmiHeader.biWidth,       // source rectangle width
    bminfo->bmiHeader.biHeight,      // source rectangle height
    0,                              // x-coordinate of lower-left corner of
                                    // source rect.
    0,                              // y-coordinate of lower-left corner of
                                    // source rect.
    0,                              // first scan line in array
    bminfo->bmiHeader.biHeight,      // number of scan lines
    bits,                           // address of array with DIB bits
    bminfo,                         // address of structure with bitmap info.
    DIB_RGB_COLORS                  // RGB or palette indexes
    );

But this doesn't. The only differences are in the source origins and width/height/number of scanlines. I'm trying to pass a smaller rectangle that starts at (100,100) and has the same lower-right corner (hence smaller width/height).

FILE* f = fopen(".\\bitmap1.bmp", "rb");

vector<BYTE> buffer;
buffer.resize(_filelength(f->_file));
fread(&buffer[0], buffer.size(), 1, f);
BITMAPINFO* bminfo = (BITMAPINFO*) &buffer[14];
BITMAPFILEHEADER* bmh = (BITMAPFILEHEADER*) &buffer[0];
LPVOID bits = &buffer[bmh->bfOffBits];

SetDIBitsToDevice(
    pDC->GetSafeHdc(),              // handle to device context
    0,                              // x-coordinate of upper-left corner of
                                    // dest. rect.
    0,                              // y-coordinate of upper-left corner of
                                    // dest. rect.
    bminfo->bmiHeader.biWidth-100,   // source rectangle width
    bminfo->bmiHeader.biHeight-100,  // source rectangle height
    100,                            // x-coordinate of lower-left corner of
                                    // source rect.
    100,                            // y-coordinate of lower-left corner of
                                    // source rect.
    0,                              // first scan line in array
    bminfo->bmiHeader.biHeight-100,  // number of scan lines
    bits,                           // address of array with DIB bits
    bminfo,                         // address of structure with bitmap info.
    DIB_RGB_COLORS                  // RGB or palette indexes
    );

What can be the problem with the second code?

There is sufficient light for those who desire to see, and there is sufficient darkness for those of a contrary disposition.
Blaise Pascal

Re: SetDIBitsToDevice problem

C^hris L^osinger9-Dec-09 9:36

C^hris L^osinger

9-Dec-09 9:36

are you sure SetDIBitsToDevice lets you draw sub-sections of a DIB ?

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Re: SetDIBitsToDevice problem

Rozis9-Dec-09 11:34

Rozis

9-Dec-09 11:34

I never have used SetDIBitsToDevice() myself. I would suggest you to use Stretchblt(), it's almost the same. I'm sure that one does the job...

My experience is that problems with these functions mostly are caused by:
- wrong coordinate system (try negative values)
- pending clipping areas

So if you try Stretchblt() and it doesn't work either you know its not in the coordinates..

And, as someone on CP a few days before suggested, there seems to be a 'DCviewer' somewhere on CP.

Good luck

Rozis

Conneting to a computer using socket

bubuzzz8-Dec-09 20:21

bubuzzz

8-Dec-09 20:21

Hi,

I am writing a small app to connect 2 computers. When i test the server side right from my computer, it 's ok. But because i am using a shared network with a router, my friends cannot connect to my computer by using my IP (because it is a local ip). Can anyone suggest a way to overcome this problem, please?

Re: Conneting to a computer using socket

CPallini8-Dec-09 21:11

CPallini

8-Dec-09 21:11

You may configure your router for NAT [^], [^].
Smile | :)

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Re: Conneting to a computer using socket

bubuzzz8-Dec-09 22:07

bubuzzz

8-Dec-09 22:07

so, that 's means i have to configure something "manually". Is there any solution by using code? I just wonder how p2p apps can work when 2 comps connected directly to each other and one comp is under a shared network OMG | :OMG:

Re: Conneting to a computer using socket

CPallini8-Dec-09 22:13

CPallini

8-Dec-09 22:13

bubuzzz wrote:
I just wonder how p2p apps can work when 2 comps connected directly to each other and one comp is under a shared network

When one of the two peer-to-peer appliacations is inside a private network, you've to configure (manually) the router for NAT.
Smile | :)

Re: Conneting to a computer using socket

Moak12-Dec-09 4:27

Moak

12-Dec-09 4:27

bubuzzz wrote:
so, that 's means i have to configure something "manually". Is there any solution by using code? I just wonder how p2p apps can work when 2 comps connected directly to each other and one comp is under a shared network OMG

As long as one of the two peers is not firewalled (incoming connections are not blocked), they can make a connection. If both are in a local network without port forwarding it gets much more trickier, but there are still possibilities (as Skype shows).

/M

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Re: Conneting to a computer using socket

Moak9-Dec-09 2:31

Moak

9-Dec-09 2:31

Port forwarding is not possible (see router configuration)?

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Re: Conneting to a computer using socket

bubuzzz10-Dec-09 21:51

bubuzzz

10-Dec-09 21:51

yup. That is what i am trying these day. Thanks all for replying me

Generating Tables in WORD

Chandrasekharan P8-Dec-09 20:15

Chandrasekharan P

8-Dec-09 20:15

How do i generate tables in WORD through code? i am creating an application where i have to create tables depending on the input given. for example, if there are 10 objects there should be 10 rows and each row should have an object.

i was trying some examples in CP. couldnt find any.. if somebody can help me it would be great

Re: Generating Tables in WORD

CPallini8-Dec-09 21:05

CPallini

8-Dec-09 21:05

There are actually some goo examples about office automation here at CP [^].
Smile | :)

Copy File Folder Message

NVCprog8-Dec-09 19:37

NVCprog

8-Dec-09 19:37

Hi Members

I am try to show Message when copy file or folder from windows explorer.Is it possible?

Re: Copy File Folder Message

sashoalm8-Dec-09 21:14

sashoalm

8-Dec-09 21:14

What do you mean?

There is sufficient light for those who desire to see, and there is sufficient darkness for those of a contrary disposition.
Blaise Pascal

Re: Copy File Folder Message

Madhu Nair8-Dec-09 21:40

Madhu Nair

8-Dec-09 21:40

Here is the clue - The CP article How to get a notification if change occurs in a specified directory[^]

Re: Copy File Folder Message

Rajesh R Subramanian8-Dec-09 22:37

Rajesh R Subramanian

8-Dec-09 22:37

You want to show the copy operation progress while it is being performed? Take a look at CopyFileEx[^] function, especially the third parameter.

“Follow your bliss.” – Joseph Campbell

Re: Copy File Folder Message

NVCprog9-Dec-09 17:13

NVCprog

9-Dec-09 17:13

i am not going to copy file folder.If copy function of windows is stsrt then i want to show message.If i use CopyFile function then easily i can show message.
I want to show message when windows copy function is start then.
Plz help me

Re: Copy File Folder Message

NVCprog11-Dec-09 18:56

NVCprog

11-Dec-09 18:56

There is any more opinion.About this topic.

How to get exe

jannathali8-Dec-09 19:17

jannathali

8-Dec-09 19:17

Hai,
I am having a C++ MFC Application. I have downloaded the original application from a website Metaqoutes.net.I have modified the program & run the pgm.It is wrkng correctly.that is when i build it & debug it,it is wrkng.But when i go to debug folder & running the Application.Exe it is showing the result of the original exe,i.e my changes r nt reflected in that.I am wrkng on VC++9 bt d original program is VC++6.Please help me

Re: How to get exe

Cedric Moonen8-Dec-09 20:28

Cedric Moonen

8-Dec-09 20:28

Check your project settings to see what is the output directory.

Cédric Moonen
Software developer

Charting control [v2.0]
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