C / C++ / MFC Discussion Boards

messages11-Dec-12 3:10

11-Dec-12 3:10

I have checked your link but I dont know why its result is different with Task manager
Task manager shows 3 threads for calc.exe but this code generate these info
Thread ID = 0x00016E0
base priority =8
delta priority =0
Thread ID= 0x0000558
base priority =8
delta priority =0

Thread ID= 0x0000115C
base priority =15
delta priority =0

could you help me

Re: Thread

David Crow11-Dec-12 3:33

David Crow

11-Dec-12 3:33

messages wrote:
Task manager shows 3 threads for calc.exe...

And your code's output shows the identifier of three threads. What were you expecting?

messages wrote:
...but this code generate these info...

The code uses GetCurrentProcessId(). How did you go about getting the process identifier for calc.exe?

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

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modified 11-Dec-12 10:52am.

Re: Thread

messages11-Dec-12 5:17

messages

11-Dec-12 5:17

I used of Task manager for get PID

Re: Thread

David Crow11-Dec-12 5:55

David Crow

11-Dec-12 5:55

Ok, I ran that exact code, only changing:

if (te32.th32OwnerProcessID == 4948) // process id of calc.exe

and it produced:

THREAD ID      = 0x00000CB8
base priority  = 8
delta priority = 0
THREAD ID      = 0x00000B18
base priority  = 8
delta priority = 0
THREAD ID      = 0x000014B0
base priority  = 15
delta priority = 0

Given calc's three threads, that's what I would expect.

modified 11-Dec-12 13:02pm.

Re: Thread

messages11-Dec-12 6:25

messages

11-Dec-12 6:25

Got it rise and shine sleepyhead it has 3 "THREAD ID " so its 3 threads for calc.exe,is it correct?

CMFCPropertyGridProperty - Protected methods don't get called

Simon Langdon10-Dec-12 2:08

Simon Langdon

10-Dec-12 2:08

Who's got experience with this class then? Examples and documentation seem pitifully thin on the ground.

I'm just playing with it to see if it's the right control for a new development.

At the moment I'm wondering how to add a button to a property. The doc suggests overloading the protected "HasButton" function

"Indicates whether a property contains a button." says MSDN

So I don't know if I'll get a button by overloading this and returning TRUE because my overloaded function never gets called; other protectesd functions that don;t ever seem to be called are Init, CreateCombo or IsValueChanged

maybe I'm contructing my CMFCPropertyGridProperty wrong?

Thanks for looking.

Re: CMFCPropertyGridProperty - Protected methods don't get called

Member 1342254421-Sep-17 11:12

Member 13422544

21-Sep-17 11:12

I'm getting the same behavior as I suspect you did trying to override the CreateCombo function in a property class derived from CMFCPropertyGridProperty. Did you ever resolve this?

AlexJ

Knowing window procedure from handle

Sakhalean9-Dec-12 23:07

Sakhalean

9-Dec-12 23:07

Hi,

I want to hook the task bar for that I have used SetWindowHookEx() function in a DLL.

But it it not working all times.

I know the task manager handle using FindWindow() API.

I want to catch the window procedure of the task bar using the task bar handle?

how to do this please help me?

Re: Knowing window procedure from handle

Richard MacCutchan10-Dec-12 0:40

Richard MacCutchan

10-Dec-12 0:40

You can find this information using the GetWindowInfo function[^] to get the class reference of the window, and then GetClassInfoEx[^] to find the pointer to the Windows procedure.

One of these days I'm going to think of a really clever signature.

Re: Knowing window procedure from handle

CPallini10-Dec-12 8:04

CPallini

10-Dec-12 8:04

You might use GetWindowLong with GWL_WNDPROC as second parameter (see MSDN[^]).

Veni, vidi, vici.

How Static variable persists/retains its value.?

mbatra319-Dec-12 20:53

mbatra31

9-Dec-12 20:53

Hi,

I need some clarification on one point. We normally use static variables in C/C++. We say when we have used a static variable inside a function, it persists its previous value when that function is called again & again, e:g: to say, static variable retains its last value when that function is called again.

Can anybody explaing me the logic behind this. How a static variable knows its last value and how it is not initialized everytime on the function call.

Regards,
Mbatra

Re: How Static variable persists/retains its value.?

PecuniousPete9-Dec-12 21:20

PecuniousPete

9-Dec-12 21:20

Because a static variable, even when declared in side a func, is created in the DATA section of a programs run space. Think of it like a global static variable that gets initialised to zero and whose value is of course persistent.

An ordinary variable declared inside a func is created on the stack. This of course winds back and forwards so when the func returns the space that variable used is lost to the next func you call.

Re: How Static variable persists/retains its value.?

Sajeesh Payolam9-Dec-12 21:25

Sajeesh Payolam

9-Dec-12 21:25

Read the discussion. refer the link below.
http://stackoverflow.com/questions/898432/how-is-static-variable-initialization-implemented-by-the-compiler

Re: How Static variable persists/retains its value.?

PecuniousPete10-Dec-12 8:58

PecuniousPete

10-Dec-12 8:58

Stackoverflow? The competition? Are you mad? Smile | :)

Re: How Static variable persists/retains its value.?

Sajeesh Payolam10-Dec-12 17:50

Sajeesh Payolam

10-Dec-12 17:50

Please read that. carefully. ok.. Smile | :)

Re: How Static variable persists/retains its value.?

PecuniousPete11-Dec-12 8:18

PecuniousPete

11-Dec-12 8:18

Why? Are you saying I am wrong? Smile | :)

VC6.0 compiler error C2664 while using GUID

Vaclav_9-Dec-12 6:44

Vaclav_

9-Dec-12 6:44

I am in over my head again.
I am getting error C2664 and I did read the Tech note ( something about ANSI improvement) about it and frankly I just do not understand what is the problem and <b>how to fix it in VC6.0.</b>

Do I have to redefine the GUID_DEVCLASS_COMPUTER?

The parameter GUID is defined in both functions as “const GUID*”

The API fails with this error C2664 and C_GetClassImgIndex compiles OK

error C2664: 'SetupDiGetClassImageIndex' : cannot convert parameter 2 from 'const struct _GUID *' to 'struct _GUID *'
Conversion loses qualifiers

Fails
b = SetupDiGetClassImageIndex(&m_imgList, &GUID_DEVCLASS_COMPUTER, &nRootImg);

OK
int n = C_GetClassImgIndex(&GUID_DEVCLASS_COMPUTER);

Any help would be greatly appreciated.
Cheers
Vaclav

Re: VC6.0 compiler error C2664 while using GUID

Richard MacCutchan9-Dec-12 7:02

Richard MacCutchan

9-Dec-12 7:02

Vaclav_Sal wrote:
The API fails with this error C2664

You are not using the API, this is a compiler error.

Vaclav_Sal wrote:
cannot convert parameter 2 from 'const struct _GUID *' to 'struct _GUID *'

You are passing a const parameter to a function that does not expect one. Use const_cast[^] to remove it. But be sure you understand the potential consequences.

One of these days I'm going to think of a really clever signature.

Re: VC6.0 compiler error C2664 while using GUID

Vaclav_9-Dec-12 8:14

Vaclav_

9-Dec-12 8:14

Richard ,
I do not follow your explanation.
In this MSDN doc the second parameter is defined as const GUID*.
Am I using wrong version ot the Setupapi.h?

PS Did you read the title? I did say compiler error.I do appreciate your help, but growing little tired of your sideline remarks,that's all.

http://msdn.microsoft.com/en-us/library/windows/hardware/ff551074(v=vs.85).aspx

BOOL SetupDiGetClassImageIndex(
_In_   PSP_CLASSIMAGELIST_DATA ClassImageListData,
_In_   const GUID *ClassGuid,
_Out_  PINT ImageIndex
);

Re: VC6.0 compiler error C2664 while using GUID

jschell9-Dec-12 9:16

jschell

9-Dec-12 9:16

Vaclav_Sal wrote:
_In_ const GUID *ClassGuid,

The pointer is a constant, not the structure.

Re: VC6.0 compiler error C2664 while using GUID

PecuniousPete10-Dec-12 9:00

PecuniousPete

10-Dec-12 9:00

Oh come on man, it is the C language. If the compiler bitches just cast it out. YOU are in control. YO are the master! Smile | :)

Re: VC6.0 compiler error C2664 while using GUID

Arild Fiskum19-Dec-12 11:18

Arild Fiskum

19-Dec-12 11:18

Have you tried something like this:

GUID tmp(GUID_DEVCLASS_COMPUTER);
b = SetupDiGetClassImageIndex(&m_imgList, &tmp, &nRootImg);

Fork Implementation using the native API RtlCloneUserProcess

akhilmv889-Dec-12 5:00

akhilmv88

9-Dec-12 5:00

Hi,
I tried to port the fork API in Linux to Windows (Windows 7 and Windows 8) using the native API RtlCloneUserProcess as discussed in the following link.
http://social.msdn.microsoft.com/Forums/en-US/windowsgeneraldevelopmentissues/thread/afdf1b68-1f3e-47f5-94cf-51e397afe073/
With the RtlCloneUserProcess function, child process is created, but didn’t get the console handle, stdin, stdout etc. The solution is to inform the CSR /win32 subsystem about the new process. But I could not able to do that. Please help me to re link the child process to the CSR.

Declaring a TBYTE in C.

Member 41945938-Dec-12 16:04

Member 4194593

8-Dec-12 16:04

How do you declare a TBYTE in C and declare a pointer to a location to be used as a TBYTE? I know how to do it in MASM, but how do you do it in C?

Dave.

Re: Declaring a TBYTE in C.

manoranjan8-Dec-12 21:56

manoranjan

8-Dec-12 21:56

This should help you:

C++

typedef unsigned char tbyte[10];

int main()
{
  tbyte a;
  a[0] = 3;
  return 0;
}

The drawback is it doesn't initialize the array for you.

My 2 cents: Please don't mix different languages' idioms. Each language is meant for a different purpose.

If you need to, you can easily use assembly. VC++ supports inline assembly. Otherwise, you can write a separate asm file and then link the resulting object file to your exe.

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