Unary And Binary Minus Operator - C# Discussion Boards

Eduard Keilholz15-Dec-09 2:47

15-Dec-09 2:47

Hey folks,

I'm trying to write a video (multimedia) application. What I want is two video objects running video clips. Once the first one stops, the other fades in and than back.

I want to render the video images on a surface, but I'm having problems converting the video image to a Texture.

I Have an IVMRWindowlessControl9 (called windowlessCtrl) which is (obviously) my Video Mixing Renderer. Using the GetCurrentImage function, I'll be able to get a pointer to the current video image in memory.
windowlessCtrl.GetCurrentImage(out currentImage);

Now I need to convert the currentImage pointer (IntPtr) to a texture in order to render the image. Can anybody help me?

Thanks!

.: I love it when a plan comes together :.
http://www.zonderpunt.nl

Re: DirectX (9) Video Renderer

Migounette15-Dec-09 4:30

Migounette

15-Dec-09 4:30

1st Check that the currentImage is not null

currentImage != IntPtr.Zero

and then

BitmapInfoHeader bih = (BitmapInfoHeader)Marshal.PtrToStructure(currentImage , typeof(BitmapInfoHeader));

take care it depends of your pin, insure that your media type is a set to video and the output format is a video type.

Re: DirectX (9) Video Renderer

Eduard Keilholz15-Dec-09 23:48

Eduard Keilholz

15-Dec-09 23:48

You for president!

.: I love it when a plan comes together :.
http://www.zonderpunt.nl

Workflow service not starting on WinServer 2003 - any ideas, hitting a wall here!

Yoken15-Dec-09 2:17

Yoken

15-Dec-09 2:17

Hi Everyone,

If anyone has even a remote idea of what might be wrong, please let me know so that we can test it.

We have written a Workflow service in C#, generated and then installed it. Problem is, it is not starting on the server. It starts up on my Dev machine fine, and on 2 other Dev pc's, but as soon as we install it to the server, I get the following error.

"error 1053:the service did not respond to the start or control request in a timely fashion"

I tried on my dev with the same service account used on the service, which didn't start until i added the account to the Administrator group. then it worked on my local dev. When adding the account to the server Admin group, still getting the same error...

Anyone know anything we can try to get this up and running? Are there specific framework installs we need to add perhaps for workflow services? I literally can't think of anything else to try.

Thanks,

Yoken

PS. My Dev machine runs : Win7, VS2008 | the server runs WinServ2003, all .net frameworks installed (1,2,3+)

Re: Workflow service not starting on WinServer 2003 - any ideas, hitting a wall here!

Migounette15-Dec-09 4:41

Migounette

15-Dec-09 4:41

I think you have already this patch (old one):

http://support.microsoft.com/?kbid=839174[^]

You can easily remotely debug your service:

http://support.microsoft.com/kb/824344[^]

I cann't help too much on it, I dind't write a service for while....

Re: Workflow service not starting on WinServer 2003 - any ideas, hitting a wall here!

Yoken16-Dec-09 19:35

Yoken

16-Dec-09 19:35

thanks for the input Migounette,

unfortunately those links didn't help much. The patch is allready loaded yes, and the remote debug only works once the service has started... which is the problem I'm having.

I'll post any new developments related to this issue.

Re: Workflow service not starting on WinServer 2003 - Solution!!

Yoken17-Dec-09 5:01

Yoken

17-Dec-09 5:01

Hi All,

Just to let you know, after how long of searching for an answer, in the end the problem was inside the code on initializing a public variable.

instead of having [very rough]

public class myclass
{
   workflowservicehost host = new workflowservicehost();

   public myclass(...) {}

}

I had to change it to

public class myclass
{
   workflowservicehost host;

   public myclass(...) 
   {
      host = new workflowservicehost();
   }
}

Doing this fixed the "Error 1053", and the service started without hassle!

Now, if only I can find out WHY that worked on my dev machine (Win7, VS2008) and not when deployed to the server (WinServ2003), it sure would be great! My only thought is something to do with the underlying infrastructure, but any guess further that that is well.. yet another guess.

Unary And Binary Minus Operator

dataminers15-Dec-09 1:12

dataminers

15-Dec-09 1:12

How can I distinguish between unary minus operator and binary minus operator in string format.

For example;

string formula = "3-4"; //Binary minus operator

string formula = "4+-1"; //Unary minus operator
string formula = "(-2)+1"; //Unary minus operator

Thanks...

Re: Unary And Binary Minus Operator

harold aptroot15-Dec-09 1:26

harold aptroot

15-Dec-09 1:26

A '-' is only binary when it follows a ')' or value, otherwise it's unary

Re: Unary And Binary Minus Operator

Luc Pattyn15-Dec-09 1:28

Luc Pattyn

15-Dec-09 1:28

when you parse an expression (scanning it left-to-right), you are looking for values and operators, and they normally alternate, starting with a value where operator means one of +-*/ and maybe more, and value means one of:
- numeric constant (digits; could also be hex, or real)
- identifier (=variable name)
- expression inside parenthesis

as a result a '-' is a binary minus whenever you are looking for an operator, and a unary minus whenever you are looking for a value.
furthermore you may check what follows the unary minus so you could reject these:
4+--2
4+-a
4+-(1+2)

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Re: Unary And Binary Minus Operator

OriginalGriff15-Dec-09 1:33

OriginalGriff

15-Dec-09 1:33

I hate to correct you, but --2 is correct: -(-2) == 2, (as are the other two, now I think about it)! They may not be something you want to see, but they are valid and should work. Laugh | :laugh:

All those who believe in psycho kinesis, raise my hand.

Re: Unary And Binary Minus Operator

Luc Pattyn15-Dec-09 1:51

Luc Pattyn

15-Dec-09 1:51

in math --2 can be acceptable.
in compiler technology, especially with languages supporting ++ and -- operators, 4+--2 normally is rejected.
try again!

PS: that's why I said "may check" and "could reject"

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

modified on Tuesday, December 15, 2009 8:02 AM

Re: Unary And Binary Minus Operator

Mirko198015-Dec-09 6:56

Mirko1980

15-Dec-09 6:56

Yes, just tried: the c# compiler sees --2 as trying to prefix decrement 2 and gives a "The operand of an increment or decrement operator must be a variable, property or indexer" error.

Re: Unary And Binary Minus Operator

OriginalGriff15-Dec-09 1:30

OriginalGriff

15-Dec-09 1:30

dataminers wrote:
How can I distinguish between unary minus operator and binary minus operator in string format.

A string doesn't care - it doesn't know it is an operator at all!

If what you are asking is:
"How do I parse a string and decide whether a '-' character is a binary or unary operator" then the answer is: context.
An expression could be defined as

<operand><operator><operand>

and an operand as:

<unary operator><operand>|<number>|...

All those who believe in psycho kinesis, raise my hand.

Re: Unary And Binary Minus Operator

PIEBALDconsult15-Dec-09 4:27

PIEBALDconsult

15-Dec-09 4:27

When I parse an expression into RPN[^];

When I find a plus or minus operator and

0) if I already have an operator in hand
or
1) if I have no operand in hand

the operator must be unary.

Toolbar for browser

hemant.kaushal15-Dec-09 0:27

hemant.kaushal

15-Dec-09 0:27

Hi all,
I have to create plugins toolbar(like google toolbar) for IE,FireFox and Flock
But I have no idea where to start for it.
I had search on google but not getting any help.

Thanks in advance.

Ambiguous

ddecoy15-Dec-09 0:15

ddecoy

15-Dec-09 0:15

I keep getting these errors when working with Directx (directsound) :

The call is ambiguous between the following methods or properties: 'Microsoft.DirectX.DirectSound.WaveFormat.WaveFormat()' and 'Microsoft.DirectX.DirectSound.WaveFormat.WaveFormat()'

The call is ambiguous between the following methods or properties: 'Microsoft.DirectX.DirectSound.BufferPositionNotify.BufferPositionNotify()' and 'Microsoft.DirectX.DirectSound.BufferPositionNotify.BufferPositionNotify()'

and so on...

Get it on xp, vista , visual 2005,2008 ...
Have no clue what is causing this errors, as everything compiles and works...

Learning without thought is labor lost; thought without learning is perilous. (Confucius)

Re: Ambiguous

Paulo Zemek15-Dec-09 0:30

Paulo Zemek

15-Dec-09 0:30

Considering the classes are the same... aren't your project referencing two versions of the same DLL?

For example, when I changed the version of one of my dlls, projects referencing it where compiling, but the project was also referencing another DLL, that referenced an old version of the first dll, and so I get those errors at run-time.

Try checking all the references in your project. I am not sure, but that might be the cause.

* Also, try checking if you are not copying locally a DLL that is in the GAC. This can also end-up loading two versions of the same DLL, which in memory have different IDs and so, are ambiguous.

Re: Ambiguous

ddecoy15-Dec-09 1:56

ddecoy

15-Dec-09 1:56

I have just one reference to the Microsoft.DirectX.DirectSound.dll, I set the copylocal to false.

If i compile the errors go away, but are there after a few seconds.

Where can I look for extra references ? In the project/solution file? app.config ?

Learning without thought is labor lost; thought without learning is perilous. (Confucius)

Re: Ambiguous

Paulo Zemek15-Dec-09 2:25

Paulo Zemek

15-Dec-09 2:25

To be honest, I don't know. When I had this type of error the cause was the local copy or one of the DLLs I created also referencing the DLL, but at another version.
If you don't use DLLs created by you, I really don't know where to look.

But your project runs? Or you only get these messages as warnings? Maybe somehing the Visual Studio is referencing the dll again, but your project doesn't.

Re: Ambiguous

ddecoy15-Dec-09 2:44

ddecoy

15-Dec-09 2:44

It will be something like that, but have no clue where these faulty references are.

It ain't warnings but real errors,and when I compile they disappear but are shortly after there again.

Anyway it's not a blocking factor but rather anoying.

Thanks for your time!

Learning without thought is labor lost; thought without learning is perilous. (Confucius)

Re: Ambiguous

morten11216-Dec-09 1:13

morten112

16-Dec-09 1:13

Have you tried writing the full namespace and class name infront of the function?

(if this fixes it - it is a simple case of you have two different namespaces defined in your class with the same function definitions inside)

Re: Ambiguous

#realJSOP15-Dec-09 7:34

#realJSOP

15-Dec-09 7:34

Right-click on the offending variable, select "Resolve", and then select the appropriate namespace from the list provided. You're probably going to have to do this for every instance of that variable in the source code.

.45 ACP - because shooting twice is just silly
-----
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001

Re: Ambiguous

ddecoy16-Dec-09 1:29

ddecoy

16-Dec-09 1:29

It doen't give me the option 'Resolve'

Also I get the error if I put the namespace in front of the class

notifyer = new Microsoft.DirectX.DirectSound.BufferPositionNotify();

Learning without thought is labor lost; thought without learning is perilous. (Confucius)

Re: Ambiguous

BurnerX17-Feb-10 6:33

BurnerX

17-Feb-10 6:33

Did you resolve this problem? We have this same prombem on one project.
Error 1 The call is ambiguous between the following methods or properties: 'Microsoft.DirectX.DirectSound.WaveFormat.WaveFormat()' and 'Microsoft.DirectX.DirectSound.WaveFormat.WaveFormat()'
Error 2 The call is ambiguous between the following methods or properties: 'Microsoft.DirectX.DirectSound.CaptureBufferDescription.CaptureBufferDescription()' and 'Microsoft.DirectX.DirectSound.CaptureBufferDescription.CaptureBufferDescription()'

Project compiles fine but IDE show this annoying error all time when you toutch code after rebuild.

You can get this with Microsoft.DirectX.DirectSound.WaveFormat waveFormat = new Microsoft.DirectX.DirectSound.WaveFormat();

I think this cause by some Ms DLL:s. Maybe some reason this same namespace some also from another dll than C:\WINDOWS\Microsoft.NET\DirectX for Managed Code\1.0.2902.0\Microsoft.DirectX.DirectSound.dll Or there is some kind version confict.
Anyways looks that this is some kind bug that this cannot show why it give this error.
And it is not any kind new thing that DirectSound is full of bugs. Secondarybyffer.PlayPosition and CaptureBuffer.GetCurrentPosition give some times random "Application Exeption" exeptions when computer is on heavy load.
Most of buffer pointers are broken so if name is read position it can mean that it is inner buffer write position so you must read at least one block behid of it or you get random null bytes. etc etc. So when you program with ds just keep it mind that is something does not work it is about 50%/50% possibility that bug is on ds not on your code Smile | :)

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.