C / C++ / MFC

31-Dec-13 19:43

How can my CWnd object retrieve the mouse coordinates while processing the WM_MOVING message?

Is there a function like "GetMouse()"?

The difficult we do right away...
...the impossible takes slightly longer.

Richard MacCutchan1-Jan-14 1:20

1-Jan-14 1:20

You probably need to capture the mouse and then use one of the tracking functions[^].

Veni, vidi, abiit domum

Richard Andrew x641-Jan-14 7:07

1-Jan-14 7:07

Ah, so that's how it's done. Thanks. Smile | :)

The difficult we do right away...
...the impossible takes slightly longer.

SandipG 2-Jan-14 0:46

SandipG

2-Jan-14 0:46

Does GetCursorPos() help?

Richard Andrew x642-Jan-14 5:12

2-Jan-14 5:12

Yes, that's very helpful. Smile | :)

I'll remember that for next time.

The difficult we do right away...
...the impossible takes slightly longer.

Richard Andrew x642-Jan-14 16:31

[SOLVED] Cann't Show Picture using RGB Data

2-Jan-14 16:31

SandipG wrote:
Does GetCursorPos() help?

I ended up using the function you suggested. Thanks again.

The difficult we do right away...
...the impossible takes slightly longer.

Django_Untaken30-Dec-13 20:00

30-Dec-13 20:00

Hello. I can not seem to understand how to show 640 x 480 RGB data onto a dialog as a single picture. Following code uses SetPixel() to show it but looks like it makes and show two pictures of 320 x 240.

C++

void CShowPicDlg::OnShowClick()
{
   CDC* pDC = this->GetDC();

   // preferred to have seperate indices for R, G and B.
   DWORD dwStartIndexRGB = 1, dwMiddleIndexRGB = 2, dwEndIndexRGB = 3;

    for (int y = 0; y < 480; y++)	//Height
    {
       for (int x = 0; x < 640; x++)	//width
       {
            POINT wndPoint;
            wndPoint.x = x;
            wndPoint.y = y;
        
            BYTE r = m_pFrameData[dwStartIndexRGB];
            BYTE g = m_pFrameData[dwMiddleIndexRGB];
            BYTE b = m_pFrameData[dwEndIndexRGB];
        
            pDC->SetPixel(wndPoint, RGB(r, g, b));
            
            dwStartIndexRGB += 4;
            dwMiddleIndexRGB = dwStartIndexRGB + 1;
            dwEndIndexRGB = dwStartIndexRGB + 2;
        
            if(dwStartIndexRGB >= m_nSize)
                break;
       }	
    }
}

So
1 - why is it showing two similar pictures of smaller frame size while the data itself is a single picture with frame size 640 x 480 ?
2 - how do I set alpha value for getting original colors?
Thanks for any pointer.

modified 1-Jan-14 23:34pm.

Richard MacCutchan30-Dec-13 22:57

30-Dec-13 22:57

What is the value of m_nSize?

C++

if(dwStartIndexRGB >= m_nSize)
    break;

Veni, vidi, abiit domum

Django_Untaken31-Dec-13 0:24

31-Dec-13 0:24

It is size of the data. I am storing this data and its size using constructor. The size of the data is 614400. As said earlier, frame size is 640 x 480 and video format is RGB32.

Jochen Arndt31-Dec-13 3:48

31-Dec-13 3:48

640 * 480 * 4 bytes/pixel = 1,228,800 bytes. A size of 614,400 indicates that you may have smaller images or less colors.

You should also consider to use one of the bit blitter functions to show the images. They are much faster than drawing them pixel by pixel.

Django_Untaken31-Dec-13 5:56

31-Dec-13 5:56

I am using IMFSourceReader interface to get frames from my HD cam. After configuring this interface when I call IMFSourceReader::ReadSample() function, I am given IMFSample pointer. Now this IMFSample contains the video data and its size. And the size is 614400.

I must point out that using the same configurations, I am writing the same data in a .wmv file using IMFSinkWriter. So how is it possible that .wmv file has the frame size 640 x 480 and then the same data, when drawing pixel by pixel, gets smaller?

I am stuck in it for the last two weeks. Still not idea how to display a frame on dialog, this way.

Jochen Arndt31-Dec-13 6:12

31-Dec-13 6:12

You must find out how the pixels are organized when you get the frames. With videos, frames may be present as progessive or interlaced frames. I guess you have interlaced frames (each frame contains only half of the picture). Then you must combine two frames to a full picture (get first scan line from frame 1, second line from frame 2, third line from frame 1, and so on).

Django_Untaken31-Dec-13 18:33

31-Dec-13 18:33

I have checked this too, and came to know that frames are progressive. Everything is sett by default and I am setting only two properties i.e. Stream Type (video) and it's sub type (RGB32).

Jochen Arndt31-Dec-13 23:50

31-Dec-13 23:50

How did you checked that? When writing the frames using IMFSinkWriter, the stream is recoded when the input format does not match the output format. But you are trying to show a frame from the input stream. So you must know the format of the input stream (which may be also recoded by IMFSourceReader). And the frame size indicates that it is interlaced or 320 * 480.

Django_Untaken1-Jan-14 1:59

1-Jan-14 1:59

Jochen Arndt wrote:
How did you checked that?

Let me write a small pseudo code for this operation, though the code is very long.

HRESULT hResult = OpenMediaSource(); // opens the MediaSource
hResult = EnumerateStream(); // enumerates the stream using presentaion desc and stream desc
hResult = ConfigureDecoder(); // configures the IMFSourceReader
hResult = SetDeviceFormat(); // set the format
hResult = ConfigureEncoder(); // configures the IMFSinkWriter

Now I am setting frame size on IMFSourceReader in ConfigureDecoder(). Then I get IMFMediaType of IMFSourceReader in ConfigureEncoder() and set it using IMFSinkWriter::SetInputMediaType(). I also use IMFMediaType->GetUINT32(MFVideoInterlaceMode, ...) within ConfigureEncoder (among other things), which returns MFVideoInterlace_Progressive.

In short, IMFSinkWriter has the same type as the IMFSourceReader. Here is how I capture the video and save it in a .bin file

IMFSample* pSample = NULL;
IMFMediaBuffer* pBuffer = NULL;

HRESULT hResult = pReader->ReadSample(); // opens stream in first call
hResult = pReader->ReadSample(); // read first sample

while(nTotalSamples <= 360) // capturing 360 samples
{
   pSample->SetSampleTime(llTimeStamp);
   pWriter->WriteSample(0, pSample);

   pSample->GetBufferByIndex(0, &pBuffer);
   pBuffer->GetCurrentLength(&dwLength); // here I get 614400

   pBuffer->Lock(&pData, NULL, &dwSize);  // again, I get 614400
   pBuffer->Unlock();

   pReader->ReadSample();

   nTotalSamples++; 
}

Hopefully I was able to make it clear.

Jochen Arndt1-Jan-14 2:30

1-Jan-14 2:30

That looks good. But the size does not match the expected resolution. Did you check the frame size (see http://msdn.microsoft.com/en-us/library/aa473821%28v=vs.85%29.aspx[^] for an example)?

Django_Untaken1-Jan-14 5:08

Close Child Common Dialog

1-Jan-14 5:08

Yes. I get this kind of information in a separate function which gets called in ConfigureEncoder(). As I said, IMFMediaType is same for both encoder and the decoder.

Since I am a newbie with this, can you explain what does it mean when the size is 1228800 (640x480x4) and 614400.

However, after all the mess that I created Smile | :)

, I must inform that I was able to run the program with expected results. You were right. 614400 size meant that the frame size was smaller (as said earlier, I don't know why). I tried frame size 320 x 480 (320x480x4) and it worked. Perhaps I will try to scale the picture for better viewing. I thank you, once again, for your constant support.

modified 1-Jan-14 23:40pm.

john563230-Dec-13 18:21

john5632

30-Dec-13 18:21

Hi,

My dialog is calling a child CFileDialog(). I killed app using Task Manager but common dialog still alive and appear as a separate process in Task Manager.

Please suggest ... how to close this?

Re: Close Child Common Dialog

Richard MacCutchan30-Dec-13 22:55

how to fix the error of the set and get function in my program?

30-Dec-13 22:55

We cannot tell what is happening unless you show the code where you start the orphan dialog.

Veni, vidi, abiit domum

Member 1049499430-Dec-13 5:16

Member 10494994

30-Dec-13 5:16

Record.h
=========

#include <string>
using namespace std;

class Record
{
public:
    void setPersonName(string);
    string getPersonName();
    void setEmail(string);
    string getEmail();
    void setTelephoneNumber(int);
    int getTelephoneNumber();

private:
    string personName;
    string email;
    int telephoneNumber;

}

-----------------------------------
Record.cpp
===========

#include <iostream>
#include <string>
 using namespace std;

#include "Record.h"

 void Record::setPersonName(string name)
 {
     personName=name;
 }
 string Record::getPersonName()
 {
     return  personName;
 }
 void Record::setEmail(string mail)
 {
     mail=email;
 }
 string Record::getEmail()
 {
     return email;
 }
 void Record::setTelephoneNumber(int number)
 {
     number=telephoneNumber;
 }
 int Record::getTelephoneNumber()
 {
     return telephoneNumber;
 }
---------

1>  Record.cpp
1>c:\users\hoyin\documents\visual studio 2010\projects\record\record\record.cpp(7): error C2628: 'Record' followed by 'void' is illegal (did you forget a ';'?)
1>c:\users\hoyin\documents\visual studio 2010\projects\record\record\record.cpp(8): error C2556: 'Record Record::setPersonName(std::string)' : overloaded function differs only by return type from 'void Record::setPersonName(std::string)'
1>          c:\users\hoyin\documents\visual studio 2010\projects\record\record\record.h(7) : see declaration of 'Record::setPersonName'
1>c:\users\hoyin\documents\visual studio 2010\projects\record\record\record.cpp(8): error C2371: 'Record::setPersonName' : redefinition; different basic types
1>          c:\users\hoyin\documents\visual studio 2010\projects\record\record\record.h(7) : see declaration of 'Record::setPersonName'
1>
1>Build FAILED.
1>

Re: how to fix the error of the set and get function in my program?

Thong LeTrung30-Dec-13 5:27

Thong LeTrung

30-Dec-13 5:27

you should add on .h file : "use std::string " or

class Record
{
public:
void setPersonName(string);
std::string getPersonName();
void setEmail(string);
std::string getEmail();
void setTelephoneNumber(int);
int getTelephoneNumber();

private:
std::string personName;
std::string email;
int telephoneNumber;

}

Re: how to fix the error of the set and get function in my program?

Albert Holguin30-Dec-13 5:28

Albert Holguin

30-Dec-13 5:28

The end of your class definition needs a ;

class Record
{
 //Prototypes...
};

How to convert a visual c++ project to a dll project file?

Adewumi Adedeji29-Dec-13 23:51

Adewumi Adedeji

29-Dec-13 23:51

I bought a fingerprint machine called ZKFinger 4500. The SDK provided is a raw code of Visual C++. I have been trying to converting this project into dll file and even if it cant be, how do i make use of it in my VB.Net Project?

Re: How to convert a visual c++ project to a dll project file?

Richard MacCutchan30-Dec-13 0:44