C / C++ / MFC Discussion Boards

How to Set the environment using CreateProcess

vipin_nvk31-Jan-09 5:02

31-Jan-09 5:02

Hi
My application (say App.exe) is supposed to be launched by another process called Laucher.exe since some environment variables are needed to be set for App.exe to run. I am using CreateProcess API in Launcher.exe to set the necessary environment variables.

I had written a sample earlier where in both by Launcher.exe and App.exe were non-unicode (built in VC 6.0). But, currently I have moved to VS 2008 which where in the application comes with unicode settings by default. I have converted both Launcher.exe and App.exe to Unicode, but I am having a problem to use CreateProcess in Launcher.exe to launch App.exe

Since my App.exe is in unicode I think we have to set the lpEnvironment (in CreateProcess to CREATE_UNICODE_ENVIRONMENT flag) But just setting this and using the API the same way fails to launch my App.exe.

I could not find sufficient links on the internet which explain how to use this flag and launch the application in a unicode environment

Can somebody help me out if you have used this in advance?

Thanx
Vipin

Re: How to Set the environment using CreateProcess

«_Superman_»31-Jan-09 15:04

«_Superman_»

31-Jan-09 15:04

After reading your question, I'm guessing your real problem is that CreateProcess API is failing in UNICODE builds. And that in the earlier NON_UNICODE builds it was successful.

If so, your title is very misleading.

Actually there is a difference in how you would call CreateProcess in UNICODE and NON-UNICODE builds.
In UNICODE builds, the lpCommandLine parameter of CreateProcess cannot be a constant because it will be modified internally. So you need to pass in a non-constant buffer here.

This is documented in MSDN, but you would need to read it properly, which most of us do not do. Smile | :)

«_Superman_»

Converting C# managed DLL to C++/VC++ unmanaged DLL

saratogacoach31-Jan-09 4:34

saratogacoach

31-Jan-09 4:34

Hi,

I am a retired social worker who creates eLearning materials that are given away to help people improve their health and to teach social work students. I need to create an unmanaged DLL that can be used to add drawing within an eLearning app which is capable of loading unmanaged DLL's and calling their functions, if these are specified.

On CodeProject, there is an excellent drawing DLL http://www.codeproject.com/KB/dialog/Basic_Drawing_Plug_in.aspx[^][^]but it is in C# which I suspect is managed code and not able to be loaded or functions called in the eLearning app.

As a novice in coding (have been trying to learn using MS's Express editions for VC++ and C#, which is a very steep learning curve for me), I am lost tyring to figure out a way to convert the C# to VC++, figure out the function calls so they can be scripted into the eLearning app, etc. With very limited understanding and skills, I keep getting error messages for whatever I try.

Any suggestions, leads, help in converting to unmanaged code plus specifying the function calls would be greatly appreciated. (Wrote to the DLL's author but have not heard back).

Thanks. Smile | :)

Kind Regards,

writer

Re: Converting C# managed DLL to C++/VC++ unmanaged DLL

«_Superman_»31-Jan-09 15:09

«_Superman_»

31-Jan-09 15:09

No easy way I guess, unless somebody can do it for you. (somebody != 'I' Smile | :)

)
Or you can get it done for a small fee by some freelancer.

Or you can wrap the managed code in a COM Callable Wrapper (CCW) and use it in unmanaged code.
But there is a steep (if not steeper) learning curve there as well.

«_Superman_»

Re: Converting C# managed DLL to C++/VC++ unmanaged DLL

saratogacoach31-Jan-09 16:55

saratogacoach

31-Jan-09 16:55

Hi Superman,

Thanks for your reply.

It appears there is no easy solution.

However, I plan to try to learn more about unmanaged DLL's since these can be used by the eLearning authoring software that I use. Even if I can't create a drawing DLL in unmanaged code, I may learn enough to create something useful.

Again, thanks for your input.

Kind Regards,

writer

Info Regarding PostMessage and GetMessage Function

rajeev281431-Jan-09 2:54

rajeev2814

31-Jan-09 2:54

Post user defined Message and how to receive it

Re: Info Regarding PostMessage and GetMessage Function

Cedric Moonen31-Jan-09 3:28

Cedric Moonen

31-Jan-09 3:28

Is this article[^] usefull ?

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

How to Compare 2 CStringArray?

mikert_200831-Jan-09 2:06

mikert_2008

31-Jan-09 2:06

Hi ,
I want to compare 2 CStringArray... Please suggest best way to compare this arrays. Can it be easy to do using STL. I would like to have easiest way (using CStrinArray / STL )to do this..

Thanks:-
Mike

Re: How to Compare 2 CStringArray?

Cedric Moonen31-Jan-09 3:25

Cedric Moonen

31-Jan-09 3:25

mikert_2008 wrote:
Please suggest best way to compare this arrays.

Please explain what you mean by compare... You have two arrays of strings, what should compared exactly ? The number of strings in the arrays, each string to its corresponding in the other array, ... ?

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: How to Compare 2 CStringArray?

Rajesh R Subramanian31-Jan-09 17:56

Rajesh R Subramanian

31-Jan-09 17:56

It largely depends on what you mean by "compare". Are you wanting to compare each and element of two arrays? You can just do the comparison in a loop, can't you?

It is a crappy thing, but it's life -^ Carlo Pallini

Appending of XML

brucewayn31-Jan-09 1:47

brucewayn

31-Jan-09 1:47

How to merge two XML files in one XML file???

Thanks in Advance

Re: Appending of XML

Jonathan Davies31-Jan-09 2:07

Jonathan Davies

31-Jan-09 2:07

If by merge you mean append (as in your subject), with two files each will have a root, so you'd have to decide which root was going to be the root of your new file. Then you could copy all children of the root from the file to be discarded so they become children of the root in the new file. That is. of course, if the format of the files makes this a sensible thing to do.

Check and Uncheck taskbar menu?

Le@rner31-Jan-09 1:29

Le@rner

31-Jan-09 1:29

Hi all,

i m place my application icon in system tray.

i have created a Taskbar Menu,in this menu one item has property of check or uncheck.

i want to working according to its check or uncheck position.

how can i check wheater the item is checked or not.

so please tell me how can i check or uncheck the menu item.

thanks in advance.

To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.

Re: Check and Uncheck taskbar menu?

Code-o-mat31-Jan-09 1:39

Code-o-mat

31-Jan-09 1:39

I believe this[^] should tell you all you need.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

hi i want to show progress bar....plz help

swapnilb131-Jan-09 1:24

swapnilb1

31-Jan-09 1:24

HI,
I HAVE 1 PROJECT(IN MFC) IN WHICH THERE IS 1 BUTTON AS WRITE CLICKING ON IT 1 FILE FROM PC WILL BE WRITTEN IN RAM (WHICH IS ON BOARD).NOW I WANT TO SHOW 1 PROGRESS BAR WHILE WRITING IA GOING ON & IT SHOULD BE DISSAPPEAR AS SOON AS WRITING IS DONE.
HOW CAN I ACHIEVE IT????
THANKS IN ADVANCE... D'Oh! | :doh:

Re: hi i want to show progress bar....plz help

Le@rner31-Jan-09 1:32

Le@rner

31-Jan-09 1:32

You can add a progress bar in your application, initially in hide condition.

when you start write you should visible your progress bar through ShowWindow(SW_SHOW),and when writing is finished you can hide your progressbar tru ShowWindow(SW_HIDE).

To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.

Re: hi i want to show progress bar....plz help

Cedric Moonen31-Jan-09 3:21

Cedric Moonen

31-Jan-09 3:21

Please, write in an understandable english and fix your keyboard, because it seems your caps lock key is broken...

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: hi i want to show progress bar....plz help

David Crow31-Jan-09 16:25

David Crow

31-Jan-09 16:25

I would implement a modeless dialog that contained a progress control. That dialog/control can be controlled via your main dialog as it does the (copy) work.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

get hard drive size.

Madan Chauhan31-Jan-09 0:42

Madan Chauhan

31-Jan-09 0:42

Hi,

In my application I need to get the complete Hard Drive size.
I am using Windows 2000.

Is there any API to get the size of hard drive in win2000?

I don't want to use WMI class (win32_DiskDrive).

Thanks in advance.

Re: get hard drive size.

«_Superman_»31-Jan-09 15:15

«_Superman_»

31-Jan-09 15:15

IOCTL_DISK_GET_DRIVE_GEOMETRY is another way to do it.
The API to use here is DeviceIoControl.

From Windows XP onwards you can use IOCTL_DISK_GET_DRIVE_GEOMETRY_EX to directly get the disk size.

«_Superman_»

Re: get hard drive size.

David Crow31-Jan-09 16:28

David Crow

31-Jan-09 16:28

Madan Chauhan wrote:
Is there any API to get the size of hard drive in win2000?

Such as this?

How can chk window is show or hide?

Le@rner30-Jan-09 23:44

Le@rner

30-Jan-09 23:44

Hi all,

for show or hide window i m using a function ShowWindow,but how can i chk window is currently show or hide.

i have created two buttons on dialog ,i want if window is show than show button is disabled and hide button is enabled.
same for hidewindow if window is hide than hide button is disabled and show button is enabled.

please tell me.

thanks in advance.

To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.

Re: How can chk window is show or hide?

Code-o-mat30-Jan-09 23:57

Code-o-mat

30-Jan-09 23:57

Surprisingly it is called IsWindowVisible[^], but really, google could have told you that in 5 secs.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Re: How can chk window is show or hide?

Le@rner31-Jan-09 0:58

Le@rner

31-Jan-09 0:58

thanks its done.

To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.

Re: How can chk window is show or hide?

Code-o-mat31-Jan-09 1:02

Code-o-mat

31-Jan-09 1:02

No probs.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

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