如何通过ctrl + alt + l键的组合生成中断。？

问题描述

在 C中编写一个TSR程序，它将清除屏幕上的所有内容并打印您的VU ID和名称（BC0000000-名称）在视频文本存储器的中心位于0xB8000000，只要Alt + Ctrl + D组合 按从键盘。 
 
请注意，在清除屏幕之前，您必须备份视频文本内存的内容。并且，只要Alt + Ctrl + R组合从按 键盘，视频文本内存的所有内容应该恢复。

此问题的代码：

问题出现在代码的末尾键盘中断

  //   CLRSCREEN和角色打印程序 
 #include< DOS.H> 
 #include< stdio.h> 
  void  interrupt（* old）（）; 
  void  interrupt scrnsvr（）; 
  //   void interrupt（* oldkey）（）;  
  //   void interrupt newkey（）;  
  //   void cls（）; SALMAN HAIDER  
 
 unsigned  char  far * scr =（unsigned  char 远*）0xb8000680; 
 unsigned  char  far * src =（unsigned  char  far *）0xb8000000; 
 unsigned  char  far * sch =（unsigned  char  far *）0x00400017; 
  int  i，j; 
  char  charsrc [ 4000 ]; 
 
  void  interrupt scrnsvr（）{
 
  //  保存内容 
  for （i =  0 ; i <   4000 ; i ++）
 charsrc [i] = *（SRC + I）; 
  //  清算屏幕 
  for （i =  0 ; i <   4000 ; i + =  2 ）
 {
 *（src + i）= 0x20; 
 *（src + i +  1 ）= 0x07; 
} 
} 
  //  在图形文本内存中心打印RollNo和Name  
  void  charPrint（）{
 * scr = 0x6D; 
 *（scr + 1）= 0x70; 
 *（scr + 2）= 0x63; 
 *（scr + 3）= 0x07; 
 *（scr + 4）= 0x31; 
 *（scr + 5）= 0x07; 
 *（scr + 6）= 0x34; 
 *（scr + 7）= 0x07; 
 *（scr + 8）= 0x30; 
 *（scr + 9）= 0x07; 
 *（scr + 10）= 0x34; 
 *（scr + 11）= 0x07; 
 *（scr + 12）= 0x30; 
 *（scr + 13）= 0x07; 
 *（scr + 14）= 0x32; 
 *（scr + 15）= 0x07; 
 *（scr + 16）= 0x32; 
 *（scr + 17）= 0x07; 
 *（scr + 18）= 0x39; 
 *（scr + 19）= 0x07; 
 *（scr + 20）= 0x37; 
 *（scr + 159）= 0x07; 
 *（scr + 160）= 0x53; 
 *（scr + 161）= 0x07; 
 *（scr + 162）= 0x61; 
 *（scr + 163）= 0x07; 
 *（scr + 164）= 0x6C; 
 *（scr + 165）= 0x07; 
 *（scr + 166）= 0x6D; 
 *（scr + 167）= 0x07; 
 *（scr + 168）= 0x61; 
 *（scr + 169）= 0x07; 
 *（scr + 170）= 0x6E; 
 *（scr + 171）= 0x07; 
 *（scr + 172）= 0x20; 
 *（scr + 173）= 0x07; 
 *（scr + 174）= 0x48; 
 *（scr + 175）= 0x07; 
 *（scr + 176）= 0x61; 
 *（scr + 177）= 0x07; 
 *（scr + 178）= 0x69; 
 *（scr + 179）= 0x07; 
 *（scr + 180）= 0x64; 
 *（scr + 181）= 0x07; 
 *（scr + 182）= 0x65; 
 *（scr + 183）= 0x07; 
 *（scr + 184）= 0x72; 
} 
  void  restore（）{
  for （j =  0 ; j <   4000 ; j ++ ）
 *（src + j）= charsrc [j]; 
} 
  / *   
 void interrupt newkey（）{
 * sch = 24; 
 *（sch + 1）= 34; 
 geninterrupt（0x65）; 
 charPrint（）; 
（* oldkey）（）; 
 * /  
 
  void  main（）{
  //   Cls  
  //   oldkey = getvect（0x09）;  
  //   setvect（0x09，newkey）;  
 
 old = getvect（0x65）; 
 setvect（0x65，scrnsvr）; 
 keep（ 0 ， 1000 ）; 
  //  功能 
 _AH = 0x09; 
  if （_ AL == 0x1D&& _AL == 0x38&& _AL == 0x20）
 {
 geninterrupt（0x65）中; 
 charPrint（）; 
} 
 其他 如果（_ AL == 0x1D&& _AL = = 0x38&& _AL == 0x13）
 {
 restore（）; 
} 
} 
} 

我尝试了什么：



我多次尝试将键盘按键的扫描码放在啊但是失败了请纠正我的代码。

解决方案

Write a TSR program in C that will clear all the contents of the screen and print your VU ID and Name (BC0000000-Name) at the center of the video text memory available at 0xB8000000 whenever Alt+Ctrl+D combination is pressed from keyboard.

Note that you have to take the backup of the contents of video text memory before clearing the screen. And, whenever Alt+Ctrl+R combination is pressed from the keyboard, all the contents of video text memory should be restored.

My Code for this Problem:
Problem occurs at the end of the code for keyboard interrupt

//CLRSCREEN AND Character Printing Program
#include<DOS.H>
#include<stdio.h>
void interrupt (*old)();
void interrupt scrnsvr();
//void interrupt (*oldkey)();
//void interrupt newkey();
//void cls();              SALMAN HAIDER

unsigned char far *scr = (unsigned char far*)0xb8000680;
unsigned char far *src = (unsigned char far*)0xb8000000;
unsigned char far *sch = (unsigned char far*)0x00400017;
int i,j;
char charsrc[4000];

void interrupt scrnsvr(){

//saving contents
    for(i=0; i < 4000; i++)
    charsrc[i] = *(src+i);
//Clearing Screen
    for(i=0; i < 4000; i+=2)
    {
        *(src + i) = 0x20;
        *(src + i + 1) = 0x07;
    }
}
//Prints RollNo and Name at Center of Graphics Text Memory
void charPrint(){
    *scr = 0x6D;
    *(scr+1) = 0x70;
    *(scr+2) = 0x63;
    *(scr+3) = 0x07;
    *(scr+4) = 0x31;
    *(scr+5) = 0x07;
    *(scr+6) = 0x34;
    *(scr+7) = 0x07;
    *(scr+8) = 0x30;
    *(scr+9) = 0x07;
    *(scr+10) = 0x34;
    *(scr+11) = 0x07;
    *(scr+12) = 0x30;
    *(scr+13) = 0x07;
    *(scr+14) = 0x32;
    *(scr+15) = 0x07;
    *(scr+16) = 0x32;
    *(scr+17) = 0x07;
    *(scr+18) = 0x39;
    *(scr+19) = 0x07;
    *(scr+20) = 0x37;
    *(scr+159) = 0x07;
    *(scr+160) = 0x53;
    *(scr+161) = 0x07;
    *(scr+162) = 0x61;
    *(scr+163) = 0x07;
    *(scr+164) = 0x6C;
    *(scr+165) = 0x07;
    *(scr+166) = 0x6D;
    *(scr+167) = 0x07;
    *(scr+168) = 0x61;
    *(scr+169) = 0x07;
    *(scr+170) = 0x6E;
    *(scr+171) = 0x07;
    *(scr+172) = 0x20;
    *(scr+173) = 0x07;
    *(scr+174) = 0x48;
    *(scr+175) = 0x07;
    *(scr+176) = 0x61;
    *(scr+177) = 0x07;
    *(scr+178) = 0x69;
    *(scr+179) = 0x07;
    *(scr+180) = 0x64;
    *(scr+181) = 0x07;
    *(scr+182) = 0x65;
    *(scr+183) = 0x07;
    *(scr+184) = 0x72;
}
void restore(){
    for(j=0; j < 4000; j++)
        *(src + j) = charsrc[j];
}
/*
void interrupt newkey(){
    *sch = 24;
    *(sch+1) = 34;
       geninterrupt(0x65);
       charPrint();
       (*oldkey)();
*/

void main(){
//Cls
//  oldkey = getvect(0x09);
//  setvect(0x09, newkey);

    old = getvect(0x65);
    setvect(0x65,scrnsvr);
    keep(0,1000);
//Function
    _AH = 0x09;
       if(_AL==0x1D && _AL==0x38 && _AL==0x20)
     {
      geninterrupt(0x65);
      charPrint();
     }
      else if(_AL==0x1D && _AL==0x38 && _AL==0x13)
    {
      restore();
     }
}
}

What I have tried:

I tried many times to put the scan code of Keyboard buttons in Ah but failed please correct me the code.

解决方案

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