In the Name box, type a name for the project, for example, DesktopApp. Choose OK. Make sure Precompiled Header isn't selected. In the middle pane, select Win32 Project.
On the Application Settings page, under Application type , select Windows application. Under Additional options , uncheck Precompiled header , then select Empty project. Choose Finish to create the project. WinMain has the following syntax. For more information, see Using IntelliSense.
Parameters and return types often use SAL Annotations to help you catch programming errors. Along with the WinMain function, every Windows desktop application must also have a window-procedure function. This function is typically named WndProc , but you can name it whatever you like. WndProc has the following syntax. In this function, you write code to handle messages that the application receives from Windows when events occur.
For example, if a user chooses an OK button in your application, Windows will send a message to you and you can write code inside your WndProc function that does whatever work is appropriate.
It's called handling an event. You only handle the events that are relevant for your application. The structure contains information about the window: the application icon, the background color of the window, the name to display in the title bar, among other things. Importantly, it contains a function pointer to your window procedure.
Use the RegisterClassEx function and pass the window class structure as an argument. This function returns an HWND , which is a handle to a window. A handle is somewhat like a pointer that Windows uses to keep track of open windows.
For more information, see Windows Data Types. At this point, the window has been created, but we still need to tell Windows to make it visible. That's what this code does:. The displayed window doesn't have much content because you haven't yet implemented the WndProc function.
In other words, the application isn't yet handling the messages that Windows is now sending to it. To handle the messages, we first add a message loop to listen for the messages that Windows sends.
When the application receives a message, this loop dispatches it to your WndProc function to be handled. The message loop resembles the following code. To enable the WndProc function to handle the messages that the application receives, implement a switch statement. The event can occur when a user moves a window in front of your window, then moves it away again. Your application doesn't know when these events occur. When the window is first displayed, all of it must be updated.
For the application, the logic between the beginning call and the ending call is to display the string 'Hello, Windows desktop! In the following code, notice that the TextOut function is used to display the string. HDC in the code is a handle to a device context, which is a data structure that Windows uses to enable your application to communicate with the graphics subsystem. The BeginPaint and EndPaint functions make your application behave like a good citizen and doesn't use the device context for longer than it needs to.
The functions help make the graphics subsystem is available for use by other applications. An application typically handles many other messages. The following code shows a basic but complete WndProc function. Delete any code you've entered in HelloWindowsDesktop. Copy this example code and then paste it into HelloWindowsDesktop. On the Build menu, choose Build Solution.
The results of the compilation should appear in the Output window in Visual Studio. To run the application, press F5. A window that contains the text 'Hello, Windows desktop! You've completed this walkthrough and built a traditional Windows desktop application. Die Anwendung ist als portable App konzipiert, die direkt ohne Installation genutzt werden kann.. Dazu gibts doch am Anfang das using namespace std; 3.
Ich teste mal. It provides a built-in compiler to build debug and a convenient editor for syntax styling and formatting a clean correct code. Habe jetzt auch die German. Mehr Infos. C-Compiler: KDevelop.
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