MsgWaitForMultipleObjects - C / C++ / MFC Discussion Boards

Re: Killing processes using TerminateProcess()

Erik Juhl15-Apr-03 9:16

15-Apr-03 9:16

There is a Kill.exe util that comes with some resource kits that takes a process name, internally looks up the process id and then calls terminate process using that id. MSDN has the sample project that builds this tool and shows you how to look up the process id based on title. You can get the sample here[^].

Re: Killing processes using TerminateProcess()

Jonathan.Oakley15-Apr-03 9:48

Jonathan.Oakley

15-Apr-03 9:48

Many thanks Erik! That is all I need for my purposes.

Cheers,

Jonathan.

Files

d.f15-Apr-03 7:53

d.f

15-Apr-03 7:53

I´d like to save an array in a file. How could I save it in VC++?? And how could I retrieve it?? Confused | :confused:

Thanks,

d.f

Re: Files

Joaquín M López Muñoz15-Apr-03 8:09

Joaquín M López Muñoz

15-Apr-03 8:09

It is up to you which format you choose to store the data of the array. A simple possibility would be:

lengthCRLF
data<sub>1</sub>CRLF
..
data<sub>n</sub>CRLF

(CRLF means new line) that is, one piece of data per line, beginning with the length of the array. Reconstructing the array from this info should be straightforward.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Menu in Dialog

bobthemonkey15-Apr-03 7:48

bobthemonkey

15-Apr-03 7:48

Is there a way to create a menu for a dialog box? Thanks.

bob

Re: Menu in Dialog

Joaquín M López Muñoz15-Apr-03 8:05

Joaquín M López Muñoz

15-Apr-03 8:05

Sure, create your menu with the resource editor, then go to the dialog resource, open its properties popup and select the menu in the Menu combobox.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Menu in Dialog

bobthemonkey15-Apr-03 8:16

bobthemonkey

15-Apr-03 8:16

D'oh! thanks.

MsgWaitForMultipleObjects

Dave_15-Apr-03 7:07

Dave_

15-Apr-03 7:07

Does anyone know if there are issues using this function within a dll call? I am trying to use it to wait for a global mutex handle, and it seems to never recognize that the mutex is available. If I use WaitForSingleObject(), it works fine. There are reasons for wanting to use the MsgWaitForMultipleObjects() so I cannot just shrug it off, and go with WaitForSingleObject().

Any ideas?

HANDLE ghAcess;

From within some function:

<br />
if (ghAccess == NULL)<br />
  ghAccess = OpenMutex(MUTEX_ALL_ACCESS,FALSE,"AccessMutex");<br />
<br />
//...This is actually within a while loop waiting about 30 seconds<br />
//this always seems to timeout:<br />
DWORD dwWaitResult = MsgWaitForMultipleObjects(1,&ghAccess,TRUE,100,QS_ALLINPUT);<br />
      switch (dwWaitResult) {<br />
        case WAIT_OBJECT_0:<br />
        case WAIT_ABANDONED_0:<br />
          return(ghAccess);<br />
        default:<br />
          break;<br />
      }<br />

Re: MsgWaitForMultipleObjects

Joaquín M López Muñoz15-Apr-03 7:46

Joaquín M López Muñoz

15-Apr-03 7:46

Are you sure you are using MsgWaitForMultipleObjects the right way? With bWaitAll set to TRUE, the function only returns WAIT_OBJECT_0 is there is some input in the queue. Is this what you want?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: MsgWaitForMultipleObjects

Dave_15-Apr-03 8:23

Dave_

15-Apr-03 8:23

What I am looking for is a way to wait for the mutex (ghAccess) to become available while allowing messages to be processed.

Setting capacity for STL vector?

Anonymous15-Apr-03 6:57

Anonymous

15-Apr-03 6:57

Hi,

I keep getting a syntax error "C2059: syntax error : 'constant'"

When I try and specify a capacity for a vector based type.

<br />
...<br />
typedef std::vector<myClass> MyClassVector;<br />
...<br />
MyClassVector mcv (100); // this line gets C2059 ???<br />
<br />

I just stare and stare yet I cannot see the syntax error? Confused | :confused:

Thanks!

Re: Setting capacity for STL vector?

Joaquín M López Muñoz15-Apr-03 7:42

Joaquín M López Muñoz

15-Apr-03 7:42

Which compiler are you using? The following compiles fine in VC++ 6.0sp5:

#include <vector>
 
class myClass{};
 
typedef std::vector<myClass> MyClassVector;
 
MyClassVector mcv (100);
 
int main()
{
  return 0;
}

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Setting capacity for STL vector?

Anonymous15-Apr-03 6:55

Anonymous

15-Apr-03 6:55

Hi,

I keep getting a syntax error "C2059: syntax error : 'constant'"

When I try and specify a capacity for a vector based type.

<br />
...<br />
typedef std::vector<myClass> MyClassVector;<br />
...<br />
MyClassVector mcv (100); // this line gets C2059 ???<br />
<br />

I just stare and stare yet I cannot see the syntax error? Confused | :confused:

Thanks!

Re: Setting capacity for STL vector?

Rickard Andersson²⁰15-Apr-03 7:03

Rickard Andersson²⁰

15-Apr-03 7:03

This is from MSDN Library:

If the error message occurs on a symbol immediately following a typedef'd variable, ensure that the variable has been defined somewhere in the source code.

Rickard Andersson⁸
Here is my card, contact me later!
UIN: 50302279
E-Mail: nikado@pc.nu
Interests: C++, ADO, SQL, Winsock, 0s and 1s

Re: Setting capacity for STL vector?

Anonymous15-Apr-03 7:12

Anonymous

15-Apr-03 7:12

That does seem to apply to my situation as if I don't specify
a capacity i get no syntax error.

<br />
...<br />
typedef std::vector<myClass> myClassVector;<br />
...<br />
myClassVector mcv; // this line does NOT cause compiler error<br />

Re: Setting capacity for STL vector?

Gary Kirkham15-Apr-03 7:35

Gary Kirkham

15-Apr-03 7:35

have you tried

mcv.reserve(100);

Gary Kirkham

A working Program is one that has only unobserved bugs

I thought I wanted a career, turns out I just wanted paychecks

STL in DLL's

Jawache15-Apr-03 6:43

Jawache

15-Apr-03 6:43

I have a DLL class that I am exporting,

// Observer Class
class APA_API CStateObserver
{
...
}

class APA_API CStateMachine
{
public:
void PushObserver(CStateObserver * inpObserver);
private:
std::deque<cstateobserver*> m_dqObservers;
}

APA_API is the define that resolves to the correct __dellspec(lalalalalal) etc...

I get this compiler warning message,
warning C4251: 'm_dqObservers' : class 'std::deque<class cstateobserver="" *,class="" std::allocator<class="" *=""> >' needs to have dll-interface to be used by clients of class 'CStateMac

I have 'Warnings as Errors' set so this warning is a real problem.

What are my options?

Cheers

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Re: STL in DLL's

valikac15-Apr-03 6:47

valikac

15-Apr-03 6:47

Did you include the header for the deque container?

Kuphryn

Re: STL in DLL's

Jim Crafton15-Apr-03 7:46

Jim Crafton

15-Apr-03 7:46

disable it - I think this is one of the ones you can safely ignore (like warning 4786 about long names)

Also make sure you don't expose it directly, such as

class Foo {
public:
  map<int,int> & getTheIntMap() {
    return m_map;
  }

private:
  map<int,int> m_map;
}

exposing it like so will cause you all sorts of problems - just don't go there.
Wrap all access to the collection with functions for adding and removing, which it appears you are doing anyways.

Also you might consider using STLPort - which may give you fewer headaches

¡El diablo está en mis pantalones! ¡Mire, mire!

Real Mentats use only 100% pure, unfooled around with Sapho Juice(tm)!

CD-ROM Status

pmask15-Apr-03 6:36

pmask

15-Apr-03 6:36

Would you tell me what API support to recognize CD-ROM status when i push the button eject on CD-ROM. Example it can recognize there are CD in CD-ROM or not.

DLL builds fine in VS 6 but gets a link error in VS.NET

Cathy15-Apr-03 6:28

Cathy

15-Apr-03 6:28

Specifically I get "LINK : fatal error LNK1561: entry point must be defined"

I searched MSDN and with Google but no luck. Did this happen to anyone else? How did you get it to build?

Cathy

Life's uncertain, have dessert first!

Re: DLL builds fine in VS 6 but gets a link error in VS.NET

Rick York15-Apr-03 6:45

Rick York

15-Apr-03 6:45

Generally speaking, a DLL wants a function called DllMain as its default entry point. Do some MSDN searches on DllMain and you should see lots of stuff. There is a sample called DllHusk that is somewhat illustrative.

The Ten Commandments For C Programmers

Re: DLL builds fine in VS 6 but gets a link error in VS.NET

Cathy21-Apr-03 7:59

Cathy

21-Apr-03 7:59

Thanks! It turns out it was a typo in the include directory listing. I had accidentally deleted the period in front of \

Cathy

Life's uncertain, have dessert first!

Re: DLL builds fine in VS 6 but gets a link error in VS.NET

Jim Crafton15-Apr-03 7:51

Jim Crafton

15-Apr-03 7:51

check for _USRDLL being defined. See if subsystem is windows. Do you have any weird linker customizations? Just a thought (I actually don't have VC7 so I may be completely off base Smile | :)

)

¡El diablo está en mis pantalones! ¡Mire, mire!

Real Mentats use only 100% pure, unfooled around with Sapho Juice(tm)!

Re: DLL builds fine in VS 6 but gets a link error in VS.NET

Cathy21-Apr-03 8:01

Cathy

21-Apr-03 8:01

Thanks! It turns out it was a typo in the include directory listing. I had accidentally deleted the period in front of \

So yes I guess I had a pretty weird linker customization goin on. Laugh | :laugh:

Cathy

Life's uncertain, have dessert first!

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