How do C++ functions play a role in GUI interface design?

C functions play a vital role in GUI interface design, including: creating windows, setting window properties, creating controls, and handling events. Practical case: A GUI login form can be created through C functions, which involves steps such as creating a window, setting the window title, creating buttons and input boxes, and handling button click events.

The role of C functions in GUI interface design

C functions play an important role in GUI interface design and are used to perform specific tasks and handle events . By using functions, you can organize your code into modules that are easy to maintain and reuse.

Basic GUI functions

The following are some basic C functions commonly used in GUI interface design:

• Create a window:Create a new window or dialog box.
• Set window properties: Set window title, size, position and visibility.
• Create controls: Create buttons, labels, text boxes and other controls in the window.
• Handling events: Define how user interactions (such as clicking a button or entering text) are handled.

Practical case: GUI login form

The following is a practical case using C functions to create a simple GUI login form:

#include <QtWidgets>

class LoginForm : public QWidget {
public:
    LoginForm() {
        // 创建窗口

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