How can C language be used to implement page flipping i…

2 years ago
Olivia Parker
3 minutes

In the C language, you can achieve a page turning effect by using the console’s cursor position and console size. Here are the specific steps:

  1. Retrieve information about the console screen buffer.
  2. Determine the number of rows displayed per page, which can be based on the size of the console, such as displaying the number of rows in the console’s page minus a few rows used for controls.
  3. Access the content or data that needs to be displayed.
  4. Based on the number of lines displayed per page, paginate the content or data and store it in an array or linked list.
  5. Set the current page number, initializing it to the first page.
  6. Calculate the starting and ending lines of the content to be displayed based on the current page number and the number of lines to display per page.
  7. Move the cursor to the line where the starting line number is located using the cursor position function.
  8. Print the contents from the starting line to the ending line in a loop.
  9. Based on the user’s input for page turning instructions, determine whether to turn the page up or down.
  10. Update the current page number according to the page turning command.
  11. Repeat steps 6 through 10 until the user chooses to exit.

Here is a simple example code:

#include <stdio.h>
#include <windows.h>

void gotoxy(int x, int y) {
    COORD coord;
    coord.X = x;
    coord.Y = y;
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), coord);
}

void clearScreen() {
    system("cls");
}

void printPage(const char** content, int startLine, int endLine) {
    for (int i = startLine; i <= endLine; ++i) {
        printf("%s\n", content[i]);
    }
}

int main() {
    int pageSize = 10;  // 每页显示的行数
    int currentPage = 1;  // 当前页数
    int totalLines = 100;  // 总行数，假设有100行数据
    int totalPages = (totalLines + pageSize - 1) / pageSize;  // 总页数
    int startLine, endLine;  // 需要显示的起始行和结束行
    const char* content[100] = {
        // 假设有100行内容
        "line 1",
        "line 2",
        // ...
        "line 100"
    };

    while (1) {
        clearScreen();

        startLine = (currentPage - 1) * pageSize;
        endLine = currentPage * pageSize - 1;
        if (endLine >= totalLines) {
            endLine = totalLines - 1;
        }

        printPage(content, startLine, endLine);

        printf("Page %d / %d\n", currentPage, totalPages);
        printf("Press 'U' to page up, 'D' to page down, 'Q' to quit: ");

        char input = getch();
        if (input == 'U' || input == 'u') {
            currentPage--;
            if (currentPage < 1) {
                currentPage = 1;
            }
        } else if (input == 'D' || input == 'd') {
            currentPage++;
            if (currentPage > totalPages) {
                currentPage = totalPages;
            }
        } else if (input == 'Q' || input == 'q') {
            break;
        }
    }

    return 0;
}

This code utilizes Windows API functions such as SetConsoleCursorPosition to set the console cursor position, GetConsoleScreenBufferInfo to retrieve console size, and getch function to obtain user input. Please make appropriate modifications according to your needs.

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