C / C++ / MFC

Re: How to Pause and continue the Progress bar in MFC.?

3-Jun-13 22:44

Hi,

this is the return value from SetTimer function.

m_VideoPlay = SetTimer(Event ID, 500, NULL);

Now I was able to stop the progress bar and the timer also, but how to start the timer from the same position when user clicks on play button.

Suppose if user has paused the video at 6 secs, then when the user clicks on the play button timer should start from 6 sec only.

Any idea about this scenario.

Regards,
Mbatra

ThatsAlok3-Jun-13 23:43

ThatsAlok

3-Jun-13 23:43

mbatra31 wrote:
Suppose if user has paused the video at 6 secs, then when the user clicks on the play button timer should start from 6 sec only.

which control are you using to display the video!

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
Support CRY- Child Relief and You

Re: How to Pause and continue the Progress bar in MFC.?

mbatra313-Jun-13 23:51

Re: How to Pause and continue the Progress bar in MFC.?

3-Jun-13 23:51

Hi,

I am using a picture control to display the video, play , pause and stop buttons on the dialog box to play/pause/stop the video. Play/Pause functionality has been implemented using DirectShow.

I am not able to start the timer from the time when user has paused the video. Timer should start incrementing from where it was stopped when user pressed the pause button.

Regards,
Mbatra

David Crow4-Jun-13 3:52

David Crow

4-Jun-13 3:52

mbatra31 wrote:
For example, when the progress dialog starts, the user click on the "pause" button, the progress bar must be paused until the "continue" button is pressed but I don't know how to pause the progress when the pause button is pressed and how to continue the progress bar when the continue button is pressed.

This is all laid out in that article I linked you to earlier. When the timer is fired, DoTimerStuff() is called. That function checks to see if the audio file is playing. If not, nothing happens (i.e., the progress bar is not updated).

"One man's wage rise is another man's price increase." - Harold Wilson

"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

"Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous

Re: How to Pause and continue the Progress bar in MFC.?

mbatra314-Jun-13 18:46

Useage about OPCODE collision detection

4-Jun-13 18:46

Hi,

Thanks for the reply.

I have done the progress bar stop and continue.....but now Issue is with Timer. I am able to stop the timer when user presses the Pause button........Next when user presses the Play button, the timer is not updated.....it remains at that position only.

I have again started the timer when user presses Play button, but it does not increment, it remains at the position where it was stopped.

Any idea how to update the timer with the Pause and Play buttons.

Regards,
Mbatra

Henry Hong2-Jun-13 22:30

2-Jun-13 22:30

Hi,
I want to know whether opcode can give me the messages besides triangle. As mesh which is defined in the opcode is consist of triangles, but most of my model is constructed using polygons, so before my collision qurey, I have to transform the polygons to triangles, but i want to know wether i could know which polygon the triangles detected are belong to. if the anwser is yes, how can i get the message?

Richard MacCutchan2-Jun-13 23:17

Richard MacCutchan

2-Jun-13 23:17

Henry Hong wrote:
how can i get the message?

How indeed! Perhaps you could start by explaining exactly what C/C++ problem you are trying to solve.

Use the best guess

Henry Hong3-Jun-13 15:55

3-Jun-13 15:55

Hello, as i want to use the OPCODE to perform collision detection,but according to the user manual, i can only get the vertex and normals that overlapped,so i want to know wether i can get the message about which polygon the vertex belong to. because that will be a important reason for me to decide wether use the OPCODE to perform my collision detection.

Richard MacCutchan3-Jun-13 20:52

Richard MacCutchan

3-Jun-13 20:52

Henry Hong wrote:
i want to use the OPCODE to perform collision detection

When I asked you to explain what your problem is I expected something more than a repeat of your original question. What do you mean by "OPCODE" and where is this collision detection supposed to take place?

Use the best guess

Henry Hong3-Jun-13 22:15

3-Jun-13 22:15

OPCODE is developed for collision detection in computer graphics, do you have the experience on it. And as I have no, and I am surveying about which manners can meet my request.

Richard MacCutchan3-Jun-13 22:22

Richard MacCutchan

3-Jun-13 22:22

See http://www.codercorner.com/Opcode.htm[^].

Use the best guess

Henry Hong3-Jun-13 22:35

3-Jun-13 22:35

I had got the resource from this address, and i also have read the mannual about the OPCODE, but as I want to learn some details about the OPCODE, I found it was difficult. And i had got the two projects "opcode" and "CDTestFramework" from that address. because i had not found the information about how to get which polygon the detected triangle is belong to in the user mannual. i hoped to find my anwser in the two projects above, but I find it was difficult to read the code in the two projects. if you had some experience about using OPCODE, i really wished you could give some suggestion about how to read the two projects. And as one of my request is two get the polygons, so if you know, can you tell me is there any manners i can get the polygons. If the answer is NO, i think I have to think about take us of other detection manners.

Thanks and Best Wishes.

image processing toolkits | batch image processing

C^hris L^osinger4-Jun-13 4:05

C^hris L^osinger

4-Jun-13 4:05

you might get better results if you ask this in the Algorithms or Graphics forums. this is a C/C++ forum, and your question doesn't seem to have anything to do with C/C++.

How to conditional call a library

thanh_bkhn2-Jun-13 19:00

2-Jun-13 19:00

Hi all,
I have a program that calls magnification.lib in windows 7, windows 8.
(I'm calling #include magnification.h)
But we know this library doesn't exist in windows XP.
How can I ignore this library when opening the application in windows XP?

«_Superman_»2-Jun-13 20:35

«_Superman_»

2-Jun-13 20:35

Create function pointers in a header file for all the magnification APIs that you're going to use.
Check the OS version and if Vista or above, call LoadLibrary on Magnification.dll.
After this call GetProcAddress on the function to initialize the function pointer.

So the header file could look like this -

typedef BOOL (*PFN_MAG_INITIALIZE)(void);

From the main program, you could have a call to some function called InitMagnification.

In the InitMagnification function, do the dynamic loading after checking the OS version.

PFN_MAG_INITIALIZE MagInitialize = NULL;

if (osVersion >= "VISTA")   // Consider this as pseudo-code
{
    HMODULE hmod = LoadLibrary(_T("Magnification.dll"));

    MagInitialize = GetProcAddress(hmod, "MagInitialize");
}

In the source where this function is called, do the checking as follows -

if (MagInitialize)
{
    MagInitalize();
}

I have omitted error checking, which you have to do.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++) (October 2009 - September 2013)

Polymorphism in C

thanh_bkhn3-Jun-13 16:05

3-Jun-13 16:05

Thank you very much. After posting this question, I did exactly what you told me to do. Thank you again

David Crow3-Jun-13 2:54

David Crow

3-Jun-13 2:54

thanh_bkhn wrote:

But we know this library doesn't exist in windows XP.
How can I ignore this library when opening the application in windows XP?

Sounds like you need to read up on implicit vs. explicit linking.

thanh_bkhn3-Jun-13 16:06

3-Jun-13 16:06

Thank you. I performed an explicitly link to my DLL.

chaau3-Jun-13 18:28

chaau

3-Jun-13 18:28

As an alternative, you could use delay load dll. In this case you do not need to change the code you have already written (related to statically linking to the library), all you need to do is just do not call chunk of codes related to magnification at all. Saves you a lot of annoying LoadLibrary/GetProcAddress calls.

However, it looks like you have already implemented it. So, just learn about this, so that you could use in future

thanh_bkhn3-Jun-13 20:32

How to mute soundin a audio / video file using directshow mfc.?

3-Jun-13 20:32

Thank you for introducing me this.
I found this way is more interesting than using LoadLibrary, but I still prefer to the old method, because it helps me to compile the program even on Windows XP

mbatra311-Jun-13 1:16

Re: How to mute soundin a audio / video file using directshow mfc.?

1-Jun-13 1:16

Hi,

I am using DirectShow to play, pause audio / video files. Now I want to implement mute functionality for any audio / video file. Is this possible using DirectShow or I have to use any other method.?

I want to make sound off from a currently playing video file, When user clicks on the sound button, audio should not be heard.

Any help will be appreciated.

Regards,
Mbatra

David Crow1-Jun-13 7:20

David Crow

1-Jun-13 7:20

So do you want to pause the playing of the audio file, or just mute the speakers (while the audio file continues to play)?

Re: How to mute soundin a audio / video file using directshow mfc.?

mbatra312-Jun-13 18:56