Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17


nietod, or anyone... ugh, still confused! help!

Posted on 1999-01-28
Medium Priority
Last Modified: 2010-04-16

Now that I know which functions to use, I still don't know exactly HOW to use them.

How would EnumChildWindows() find an edit box? Does it find the resource ID?

Can I get some code for this?
Question by:SuperMario
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
LVL 22

Expert Comment

ID: 1185426
Once you have the parent window you call EnumChildWindows() specifing the parent window's handle and a pointer to a callback procedure you've written.  windows will call your callback function for each child window that the specified window has.  for each window, check to see if it is the edit box window, if so, you've found it, do whatever you want with it and then return FALSE, to stop enumeration.   If it is not the target window, return TRUE to continue enumeration.

You can test if a window is an edit box by looking at its class name.  You obtain that with GetClassName().

Author Comment

ID: 1185427
I tried EnumWindows, but.. I honestly have no clue how to implement this into code. I'm sorry I'm being so dense about it. I need just... code. I'm a visual learner.

Author Comment

ID: 1185428

Using Spy ++, I found the handle, class, style and rect of the edit box. So now, how would I put text into this window w/ the given info?

Thanks so much,
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!


Author Comment

ID: 1185429
Now that I found this, I tried just changing its caption. It sucks though, because no matter what I try I get a "This program has performed an illegal operation" because of an unhandled exception in MFC42D.DLL.\

This is getting mighty confusing.

Accepted Solution

Answers2000 earned 0 total points
ID: 1185430
I missed any previous question, but here's how to use the functions you mention

1. Code

// the enumeration call-back
BOOL CALLBACK EnumChildProc( HWND hWndChild, LPARAM lParam )
char szClassName[256] ;
GetClassName( hWndChild, szClassName, sizeof szClassName )

if ( 0 == _strcmpi( szClassName, "edit" ) )
 // hWndChild is the child edit control, do whatever you need here

return TRUE ;

// in your main code
EnumChildWindows( hWndParent, (WNDENUMPROC)EnumChildProc, 0 ) ;

2. If the call-back function is a member of class make sure it's a static member, e.g.

class CSomeClass
static BOOL CALLBACK CSomeClass::EnumChildProc( HWND hWndChild, LPARAM lParam )
} ;

BOOL CALLBACK CSomeClass::EnumChildProc( HWND hWndChild, LPARAM lParam )
// etc

3. Note - when you call EnumChildWindows the last parameter get's passed into the LPARAM of the EnumChildProc function.  You can use this to pass any data type you want.  As a pointer will fit into LPARAM simply cast a pointer to whatever data structure the call back function might need.

Author Comment

ID: 1185431
That should do it! Thanks a ton.

Featured Post

Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Many modern programming languages support the concept of a property -- a class member that combines characteristics of both a data member and a method.  These are sometimes called "smart fields" because you can add logic that is applied automaticall…
This article shows you how to optimize memory allocations in C++ using placement new. Applicable especially to usecases dealing with creation of large number of objects. A brief on problem: Lets take example problem for simplicity: - I have a G…
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.

688 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question