c - 设置使用 Print (gnu-efi) 打印的文本颜色

Question

我想使用 Print 函数调用将一些文本打印到屏幕上。有没有什么方法(或任何其他函数)来设置文本的颜色？

Answer 1

这将设置您的打印颜色:

uefi_call_wrapper(SystemTable->ConOut->SetAttribute, 1, SystemTable->ConOut, EFI_YELLOW); //SET TEXT COLOR

简单地EFI_COLORNAME -> 红色、黄色、绿色、蓝色等。然而，它是相当有限的。

为了再次设置颜色，我们使用代码:

`uefi_call_wrapper(SystemTable->ConOut->SetAttribute, 1, SystemTable->ConOut, EFI_BACKGROUND_MAGENTA);` //SET BACK COLOR    

简单地EFI_BACKGROUND_COLORNAME -> 磁铁色、黑色、蓝色、棕色等。然而，它是非常有限的。我认为您可以定义自定义颜色，例如 EFI_BACKGROUND_MYSPECIALCOLOR

还有基于 gnu 的完整代码:

/*
 * UEFI:SIMPLE - UEFI development made easy
 * Copyright © 2014-2018 Pete Batard <pete@akeo.ie> - Public Domain
 * See COPYING for the full licensing terms.
 */
#include <efi.h>
#include <efilib.h>
#include <stdio.h>

// Application entrypoint (must be set to 'efi_main' for gnu-efi crt0 compatibility)
EFI_STATUS efi_main(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
{
    UINTN Event;

#if defined(_GNU_EFI)
    InitializeLib(ImageHandle, SystemTable);
#endif

    /*
     * In addition to the standard %-based flags, Print() supports the following:
     *   %N       Set output attribute to normal
     *   %H       Set output attribute to highlight
     *   %E       Set output attribute to error
     *   %B       Set output attribute to blue color
     *   %V       Set output attribute to green color
     *   %r       Human readable version of a status code
     */

    uefi_call_wrapper(SystemTable->ConOut->SetAttribute, 1, SystemTable->ConOut, EFI_BACKGROUND_MAGENTA); //SET BACK COLOR  
    Print(L"\n***DO NOT DISPLAY THIS***%N\n\n");
    uefi_call_wrapper(SystemTable->ConOut->ClearScreen, 1, SystemTable->ConOut); //CLEAR SCREEN
    uefi_call_wrapper(SystemTable->ConOut->SetAttribute, 1, SystemTable->ConOut, EFI_YELLOW); //SET TEXT COLOR  
    Print(L"\n*** UEFI:HELLO MY FRIEND, bla bla and some other very necessary messages... ***%N\n\n");
    uefi_call_wrapper(SystemTable->ConOut->SetAttribute, 1, SystemTable->ConOut, EFI_RED); //SET TEXT COLOR
    Print(L"PRESS ANY KEY TO EXIT.%N\n");

    SystemTable->ConIn->Reset(SystemTable->ConIn, FALSE);
    SystemTable->BootServices->WaitForEvent(1, &SystemTable->ConIn->WaitForKey, &Event);

#if defined(_DEBUG)
    // If running in debug mode, use the EFI shut down call to close QEMU
    SystemTable->RuntimeServices->ResetSystem(EfiResetShutdown, EFI_SUCCESS, 0, NULL);
#endif

    return EFI_SUCCESS;
}

如果你问如何改变print自己的单元格背景。好吧，我不知道。