C / C++ / MFC Discussion Boards

CMenu - how to draw the popup arrow yourself?

YaronNir11-Sep-06 21:13

11-Sep-06 21:13

since windows draw it for , i counldn't find any way to avoid it when i was creating my own ownerdrawn menu...

any1?

thanks in advanced

Yaron

Interface basics click here :
http://www.codeproject.com/com/COMBasics.asp

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Re: CMenu - how to draw the popup arrow yourself?

Sarath C11-Sep-06 21:38

Sarath C

11-Sep-06 21:38

What about putting a bitmap there?

hope you are aware about drawing triangles using PolyLine method or MoveTo, LineTo combination in GDI. All you need to specify the cordinates... You can adopt that method.

Another tweak is that
using lines you can draw a pooup triangle.
Here I have drawn a triangle using three lines. Assume that each "|" represents a pixel and each column with "|" represents a line.

You can use this method.

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Sorry no time to write code for the same Smile | :)

-Sarath.
The more you can dream the more you can do - Michael Korda"

My blog - Sharing My Thoughts, An Article - Understanding Statepattern

Re: CMenu - how to draw the popup arrow yourself?

YaronNir11-Sep-06 21:55

YaronNir

11-Sep-06 21:55

i can draw what ever i want, the problem is that after the 'DrawItem' is finished, windows calls its own methods to draw the arrow by itself, so it overwrite my drawings... Frown | :(

anyway to bypass this problem?

thanks

Yaron

Interface basics click here :
http://www.codeproject.com/com/COMBasics.asp

don't forget to vote Smile | :)

Re: CMenu - how to draw the popup arrow yourself?

Waldermort12-Sep-06 0:29

Waldermort

12-Sep-06 0:29

Just subclass the menu and handle your own painting.

Re: CMenu - how to draw the popup arrow yourself?

YaronNir12-Sep-06 2:57

YaronNir

12-Sep-06 2:57

subclass as in inherite a class from CMenu and implement DrawItem?

if this is what you suggest, i've already done that, and still the problem remains, because after draw item, windows draw the arrows itself....

Yaron

Interface basics click here :
http://www.codeproject.com/com/COMBasics.asp

don't forget to vote Smile | :)

Re: CMenu - how to draw the popup arrow yourself?

Steve S12-Sep-06 3:19

Steve S

12-Sep-06 3:19

No, subclass and implement a handler for WM_PAINT.

Steve S
Developer for hire

Re: CMenu - how to draw the popup arrow yourself?

Member 119860114-Sep-08 0:51

Member 1198601

14-Sep-08 0:51

I used the following trick:
At the end of your DrawItem(), just before returning, set an empty clipping region. This will effectively prevent Windows from drawing over your arrow.
At the beginning, reset the clipping region to ensure you can draw back.
Code:

void CMyMenu::DrawItem(LPDRAWITEMSTRUCT lpDIS)
{
	// Reset clipping region
	pDC->SelectClipRgn(NULL);

	// Your drawing code goes here

	// Set clipping region. This will ensure Windows doesn't draw
	// the popup icon, which we are drawing ourselves.
	pDC->IntersectClipRect(0,0,0,0);
}

Re: CMenu - how to draw the popup arrow yourself?

YaronNir14-Sep-08 0:56

YaronNir

14-Sep-08 0:56

Sounds interesting, will try it

thanks a lot man

Smile | :)

Interface basics click here :
http://www.codeproject.com/com/COMBasics.asp

don't forget to vote Smile | :)

Using handles in DLL ... HELP

pega11-Sep-06 20:55

pega

11-Sep-06 20:55

I wrote a DLL that should serve as interface to an usb-device so that it could handle different requests from different applications. The idea was that the DLL could synchronise all requests and the device should be opened only once.

The problem with this is that although i can use some shared memory between all instances using the DLL, I can't find the good solution for the single HANDLE to my file/device.

I tried starting a thread from the first instance that would hold the handle and all instances would talk with this thread, but then the problem comes when this first instance dies it takes the thread down with it ...

I also tried using two dll's. I thought I could load the 2nd dll from within the first one so that all instances of the first dll would communicate with only one instance of the second dll, but that ain't working either.

At this moment I only can get it to work if every instance/request opens and closes the handle of the file/device over and over again, but that doesn't seem the nice way to me.

So basically my question is this: How can I keep one handle of a file in a dll so that every call made to this dll can use this handle ?

Any help would be welcome thanks

Re: Using handles in DLL ... HELP

Michael Dunn11-Sep-06 21:32

Michael Dunn

11-Sep-06 21:32

HANDLEs are only valid within one process, unless you explicitly make a copy with DuplicateHandle() and pass the resulting handle value to another process.

--Mike--
Visual C++ MVP Cool | :cool:

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Re: Using handles in DLL ... HELP

pega12-Sep-06 3:39

pega

12-Sep-06 3:39

Thx for the help ...

I don't see how I can get it to work as GetCurrentProcess() (which i need to retrieve the process handle) returns 0xffffffff from within my dll.
Any suggestions ?

Re: Using handles in DLL ... HELP

Michael Dunn12-Sep-06 19:48

Michael Dunn

12-Sep-06 19:48

That's the correct vaule, GetCurrentProcess() returns a pseudo-handle that other functions interpret to mean "the current process"

--Mike--
Visual C++ MVP Cool | :cool:

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To identify the 'identity' of the calling process

Gupta Suraj11-Sep-06 20:30

Gupta Suraj

11-Sep-06 20:30

Hi All,

I have a application, say A.exe. It launches another application, say B.exe. In B.exe i need to know the identity (pid, process name) of calling application.

Is there any way by which I can do it?

Thanks,
Suraj

Suraj Gupta

Re: To identify the 'identity' of the calling process

Hamid_RT11-Sep-06 20:46

Hamid_RT

11-Sep-06 20:46

See GetProcessTimes By DavidCrow.[^] i think its helpful for you

WhiteSky

Re: To identify the 'identity' of the calling process

Gupta Suraj11-Sep-06 21:05

Gupta Suraj

11-Sep-06 21:05

Hi,

Thanks for the reply but the link did not help.

-Suraj

Suraj Gupta

Re: To identify the 'identity' of the calling process

Hamid_RT11-Sep-06 21:24

Hamid_RT

11-Sep-06 21:24

When you run B.exe what happen for A.exe its close?

WhiteSky

Re: To identify the 'identity' of the calling process

Hamid_RT13-Sep-06 8:09

Hamid_RT

13-Sep-06 8:09

You can read detaily from a.exe and use WM_COPYDATAfor send this data to B.exe

WhiteSky

Re: To identify the 'identity' of the calling process

prasad_som11-Sep-06 20:50

prasad_som

11-Sep-06 20:50

If you have handle two A.exe window, you can use GetWindowThreadProcessId.

Prasad
Notifier using ATL

Re: To identify the 'identity' of the calling process

Gupta Suraj11-Sep-06 21:04

Gupta Suraj

11-Sep-06 21:04

Hi,

I don't have the handle of A.exe window.

-Suraj

Suraj Gupta

Re: To identify the 'identity' of the calling process

prasad_som11-Sep-06 21:12

prasad_som

11-Sep-06 21:12

Gupta Suraj wrote:
I don't have the handle of A.exe window

What do you mean by this. Is that process is windowless ?

Prasad
Notifier using ATL

Re: To identify the 'identity' of the calling process

Gupta Suraj11-Sep-06 23:51

Gupta Suraj

11-Sep-06 23:51

No, Exe is not windowless. Exactly the problem is that "A.exe" which is parent process, it can change mean 'A'can take any name. So i have to identify the name of the application. On that basis logic of my application will be based.

Suraj Gupta

Re: To identify the 'identity' of the calling process

prasad_som12-Sep-06 0:52

prasad_som

12-Sep-06 0:52

Gupta Suraj wrote:
Exactly the problem is that "A.exe" which is parent process, it can change mean 'A'can take any name. So i have to identify the name of the application

You need some information of process, i.e. name etc. to get its PID.
See if this[^] example helps you?

Prasad
Notifier using ATL

Re: To identify the 'identity' of the calling process

benjymous11-Sep-06 22:37

benjymous

11-Sep-06 22:37

Couldn't you just provide them as command line arguments to B, or do you not have any control over how A invokes B?

--
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Re: To identify the 'identity' of the calling process

Gupta Suraj11-Sep-06 23:43

Gupta Suraj

11-Sep-06 23:43

I don't have the control, how A invokes B.

Suraj Gupta

Re: To identify the 'identity' of the calling process

Randor 12-Sep-06 8:33

Randor

12-Sep-06 8:33

Not sure if you still need help with this... being that I am 12 hours late.

Here is how I would do it using toolhelp32

PROCESSENTRY32    pe32 = {0};<br />
pe32.dwSize = sizeof(PROCESSENTRY32);<br />
DWORD dwMYPID=GetCurrentProcessId();<br />
DWORD PID_parent =0;<br />
HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS,0);<br />
      if (Process32First(hSnapshot, &pe32))<br />
      {<br />
            while (Process32Next(hSnapshot, &pe32))<br />
            {<br />
                  if(pe32.th32ProcessID==dwMYPID)<br />
                  {<br />
                        PID_parent=pe32.th32ParentProcessID;<br />
                  }<br />
            }<br />
      }

At this point PID_parent contains the PID of the parent process.
You could get the filename of the parent process in another loop by doing something like:

GetFileNameFromPath(pe32.szExeFile);

Best Regards,
-Randor (Dave)

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