Dev C%2b%2b Application Error
- 'Subscribe' in return, if this solves your problem:).
- Programming Languages Supported: C, C, Objective-C, Fortran and others. Also Read: The 1-2-3 Of C Interview- Common But Essential Questions To Ace Any C Interview. Indeed, IDE’s are great for programmers to write an error-free code more efficiently and fast.
The idea pad works great! I downloaded Dec c to study for my final and I I got it working eventually haha but yeah smooth runs the laptop itself can hold some serious load but windows 10 does tend to take up space pretty quickly so a cloud storage or external memory unit is advised. This maybe because the c compiler is designed to work in linux.I had this problem too and to fix it go to tools and select compiler options.In the box click on programs. Now you will see a tab with gcc and make and the respective path to it.Edit the gcc and make path to use mingw32-c.exe and mingw32-make.exe respectively.Now it will work.
Introduction
Have you ever wanted to spice up your C++ console application with the odd bit of GUI magic? Perhaps pop up a dialog to ask a user for input, select a file, or display an error message? This two-part tutorial shows how you can do all that using the Windows API without having to go to the lengths of writing a full-blown Windows application.
This is why you see a quick flash of your console application. There are a few things you can do to see the output of your program. Start your application without debugging (Ctrl+F5). When doing this, the C IDE creates a batch file that executes your code and displays the text 'Press any key to continue'.
To follow this tutorial, you will need a C++ compiler that you can use from the command line. I assume GCC (see here for how to install it), but you could also use the Microsoft command line compiler – I give brief details of how to do this at the end of the tutorial. You will also need a command line prompt, and a text editor of some sort – Notepad will do at a pinch.
A First Dialog
The easiest dialogs to use from console applications are the message boxes provided by the Windows API. Here’s about the simplest program you can write to create one:
Create this text using your editor, and save it as ex1.cpp. Now compile it with GCC (the ‘>’ in these examples indicates the command line prompt):
This will compile the code, and create an executable called ex1.exe. Now run it:
This should produce an impressive dialog:
Now take a look again at the code you wrote:
This pulls in the declarations of most (but not all) of the commonly-used functions in the Windows C API. Almost all Windows programs that do anything with the API will need to include this header.
/malayalam-bible-free-download-for-mobile.html. This calls the MessageBox function which is part of the Windows API. I do not propose in this tutorial to explain all the parameters of such functions in detail, but here they are the handle of the owning window (using zero makes the desktop the owner), the message and the caption you want displayed, and some options, which have not been specified.
Now, let’s turn this into a semi-useful program:
Save this as ex2.cpp and compile (this is the last time I’ll be giving specific instructions to do this):
Now run it like this:
Which should produce:
This can be quite a handy program to use in Windows batch (.CMD) files, where it can provide status information at various points in the processing.
Getting Input
Message boxes can also be used to get input from the user. Let’s create a version of the previous program which prompts the user for a yes/no response:
This uses the options of the MessageBox function to specify that you would like a Yes and a No button, and a question mark icon. As you have specified the MB_YESNO option, the function will now return one of two special values – IDYES or IDNO, depending on which button the user hits, which get tested and results in the corresponding input on standard output, using the normal C++ stream output facilities. The dialog it displays looks like this:
This is also a handy program (here called ‘ex3’ ) to use in a batch file:
Dev C 2b 2b Application Error Key
There are other button and icon combinations you can use – see the MSDN documentation on MessageBox for details. However, very simple Yes/No and OK/Cancel responses is about all that MessageBox is capable off.
Getting File Names
Suppose you want to write a C++ program that performs line-numbering. You need some way of getting the name of the file you want to list. You could prompt the user using the command line, use command line parameters, or you could use something like this:
Using the Windows API to pop up a standard file selection dialog from a program is pretty easy. Before doing it, let’s have a look at the pure command line version of the program:
There is nothing very exceptional here. I suggest you compile and run this program so you understand what it does, and then we’ll look at replacing the GetFileName function with one that pops up the file selection dialog.
The file selection dialog is one of a group of dialogs which were added to Windows quite late on in its history. Before than, all common tasks, like file selection, had to be completely coded by each application. This was a vast waste of time and effort, and everyone gave a sigh of relief when the Common Dialogs were introduced.
Dev C 2b 2b Application Error Form
The open-for-read dialog is produced by the Windows API function GetOpenFileName and the associated OPENFILENAME struct. This is an immensely complicated structure that is fully described in the MSDN documentation. If you check out this documentation, you will see that things have got even more complicated, as (since Vista) MS would like you to use some COM interface to get file names, but I’m sticking with the older API.
The OPENFILENAME struct has a shed-load of fields, but luckily most of them can profitably be set to zero and ignored. The only ones you absolutely have to worry about are the input buffer and buffer size and the size of the struct itself. We’ll also set the caption field to be the prompt. The replacement for the GetFileName function in the code above then looks like this:
Here the buffer size is set to something suitably large, and used to size the buffer, which is zero initialised. An instance of the OPENFILENAME struct is then created and also zero-initialised. Then the fields you are interested in get set up – the buffer, the buffer size and the caption (title) string. Then the API function GetOpenFileName is called to display the dialog with the address of the struct you have just set up as its parameter. When the function returns, any selected file name will be in the buffer, which is then returned from the function.
If you now compile this new program (let’s say you called it ex5.cpp) you may be surprised to get this error message:
This is a message from the GCC linker saying that it knows nothing about the function GetOpenFileName. This happens because (as I mentioned earlier) the common dialogs were added late to Windows and are not in the libraries that most compilers search by default. In fact, the import library for common dialogs under GCC is called libcomdlg32.a and you have to tell GCC to use it like this:
The file open dialog has many more features. For example, you can tell it which directory to start in, which kind of files to list and many other things. These are all described in the MSDN documentation, and using them is left as an exercise for you! There are also a number of other common dialogs which support things like font and colour selection, and which work in a similar manner to GetOpenFileName.
Using The Microsoft C++ Compiler
To use the Microsoft command line compiler, you will have to start up a command prompt using the VS20xx Prompt shortcut that should get installed along with Visual C++. This will set up all the required environment variables for you. Then to compile the message box programs, use a command line like this;
This will generate an executable called ex1.exe. Note that you have to specify the USER32 library, which contains the MessageBox function, which GCC will link with by default.
To build the file open dialog code, you need to specify the common dialogs library:
Conclusion
This first tutorial has looked at the built-in dialogs that Windows provides for your applications. In the next tutorial I will look at what is entailed in creating a custom dialog.
-->A desktop application in C++ is a native application that can access the full set of Windows APIs and either runs in a window or in the system console. Desktop applications in C++ can run on Windows XP through Windows 10 (although Windows XP is no longer officially supported and there are many Windows APIs that have been introduced since then). Acls manual pdf free download piratebay.
A desktop application is distinct from a Universal Windows Platform (UWP) app, which can run on PCs running Windows 10, and also on XBox, Windows Phone, Surface Hub, and other devices. For more information about desktop vs. UWP applications, see Choose your technology.
Desktop Bridge
In Windows 10 you can package your existing desktop application or COM object as a UWP app and add UWP features such as touch, or call APIs from the modern Windows API set. You can also add a UWP app to a desktop solution in Visual Studio, and package them together in a single package and use Windows APIs to communicate between them.
In Visual Studio 2017 version 15.4 and later, you can create a Windows Application Package Project to greatly simplify the work of packaging your existing desktop application. A few restrictions apply with respect to what registry calls or APIs your desktop application uses, but in many cases you can create alternate code paths to achieve similar functionality while running in an app package. For more information, see Desktop Bridge.
Terminology
A Win32 application is a Windows desktop application in C++ that can make use of native Windows C APIs and/or COM APIs CRT and Standard Library APIs, and 3rd party libraries. A Win32 application that runs in a window requires the developer to work explicitly with Windows messages inside a Windows procedure function. Despite the name, a Win32 application can be compiled as a 32-bit (x86) or 64-bit (x64) binary. In the Visual Studio IDE, the terms x86 and Win32 are synonymous.
The Component Object Model (COM) is a specification that enables programs written in different languages to communicate with one another. Many Windows components are implemented as COM objects and follow standard COM rules for object creation, interface discovery and object destruction. Using COM objects from C++ desktop applications is relatively straightforward, but writing your own COM object is more advanced. The Active Template Library (ATL) provides macros and helper functions that simplify COM development.
An MFC application is a Windows desktop application that use the Microsoft Foundation Classes to create the user interface. An MFC application can also use COM components as well as CRT and Standard Library APIs. MFC provides a thin C++ object-oriented wrapper over the window message loop and Windows APIs. MFC is the default choice for applications—especially enterprise-type applications—that have lots of user interface controls or custom user controls. MFC provides convenient helper classes for window management, serialization, text manipulation, printing, and modern user interface elements such as the ribbon. To be effective with MFC you should be familiar with Win32.
A C++/CLI application or component uses extensions to C++ syntax (as allowed by the C++ Standard) to enable interaction between .NET and native C++code. A C++/CLI application can have parts that run natively and parts that run on the .NET Framework with access to the .NET Base Class Library. C++/CLI is the preferred option when you have native C++ code that needs to work with code written in C# or Visual Basic. It is intended for use in .NET DLLs rather than in user interface code. For more information, see .NET Programming with C++/CLI (Visual C++).
Any desktop application in C++ can use C Runtime (CRT) and Standard Library classes and functions, COM objects, and the public Windows functions, which collectively are known as the Windows API. For an introduction to Windows desktop applications in C++, see Get Started with Win32 and C++.
In this section
| Title | Description |
|---|---|
| Windows Console Applications in C++ | Contains information about console apps. A Win32 (or Win64) console application has no window of its own and no message loop. It runs in the console window, and input and output are handled through the command line. |
| Walkthrough: Creating Windows Desktop Applications (C++) | Create a simple Windows desktop application. |
| Creating an Empty Windows Desktop Application | How to create a Windows desktop project that has no default files. |
| Adding Files to an Empty Win32 Applications | How to add files to an empty project. |
| Working with Resource Files | How to add images, icons, string tables, and other resources to a desktop application. |
| Resources for Creating a Game Using DirectX (C++) | Links to content for creating games in C++. |
| Walkthrough: Creating and Using a Static Library | How to create a .lib binary file. |
| How to: Use the Windows 10 SDK in a Windows Desktop Application | Contains steps for setting up your project to build using the Windows 10 SDK. |
Related Articles
| Title | Description |
|---|---|
| Windows Development | Contains information about the Windows API and COM. (Some Windows APIs and third-party DLLs are implemented as COM objects.) |
| Hilo: Developing C++ Applications for Windows 7 | Describes how to create a rich-client Windows desktop application that uses Windows Animation and Direct2D to create a carousel-based user interface. This tutorial has not been updated since Windows 7 but it still provides a thorough introduction to Win32 programming. |
| Overview of Windows Programming in C++ | Describes key features of Windows desktop programming in C++. |