Solved

Problem calling API functions directly

Posted on 1997-10-31
3
221 Views
Last Modified: 2013-12-14
I am designing a user interface for Win 95 using Microsoft Visual C++ 5.0.  I have not been able to directly call an API function.  I have had no problem accessing them through the MFC library classes though.  For example, I used the CFileDialog class to implement a file open dialog box but when I tried calling the API function, GetOpenFileName() directly nothing happens during execution.  No compile or link error during build.  When I run the debugger and try to step into GetOpenFileName(), it was skipped over without even hitting the first internal line of code.  A call to GetOpenFileName() was in the assembly code when I checked.  Now, I need a simple audible ‘beep’ for my interface and I want to directly call another API function, Beep().  I haven’t found a MFC library class that encompasses Beep() so I am trying to call the API function directly.  Any ideas why I am having problems calling API functions directly?
0
Comment
Question by:chele
3 Comments
 
LVL 15

Accepted Solution

by:
Tommy Hui earned 100 total points
ID: 1172332
If you're in the context of a CWnd-derived class's functions, then you will need to use :: (scope resolution operator) to use the global functions.

For example, use ::GetOpenFileName() to call the global version (API version).

If you want a beep, take a look at the online help for ::MessageBeep(). You can pass a parameter for what types of beep you want.

0
 
LVL 22

Expert Comment

by:nietod
ID: 1172333
Are you sure the API function is not executing?  Microsoft's debugger will not step into an API function.  This is to try to keep its workings secret (other debgers will, however.)  However the debugger will still run the function, it just won't step into it.  
0
 

Author Comment

by:chele
ID: 1172334
Thanks again thui!
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

IntroductionThis article is the second in a three part article series on the Visual Studio 2008 Debugger.  It provides tips in setting and using breakpoints. If not familiar with this debugger, you can find a basic introduction in the EE article loc…
Container Orchestration platforms empower organizations to scale their apps at an exceptional rate. This is the reason numerous innovation-driven companies are moving apps to an appropriated datacenter wide platform that empowers them to scale at a …
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 learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.

749 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