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biosequip( ) - sys confi biosdisk( ) - partition tbl info Pc type-bios data area File allocation table Telephone directory

TSR Programming

Interchange letters Interchange letters on screen Unload TSR on key press-keyboard Unload TSR - timer interrupt Activate, deactivate TSR Print alphabet from printer Repeat key press Keep caps on Make ctrl, alt key pressed

Interrupt Programming

Restart computer Conventional memory of sys Save IVT in file Print string-interrupt 21h Read char-interrupt 21h Read char with echo-interrupt 21h Delete file-interrupt 21h Delete directory-interrupt 21h Get set system date Show system configuration Search, delete file in dir Display multiple file in dir

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Program to delete a specified file using Interrupt 21h

 

Image

 # include <stdio.h>
 # include <conio.h>
 # include   <dos.h>

 const int DeleteFile(const char*);

 int main( )
 {
    char* File=NULL;

    clrscr( );

    printf(\" Enter the File Path and Name to delete = \");
    scanf(\"%s\",File);

    if(DeleteFile(File))
       printf(\"\\n Error : Unable to delete the file.\");

    else
       printf(\"\\n The File is deleted sucessfully.\");

    getch( );
    return 0;
 }


 //---------------------------  DeleteFile( )  ---------------------------//


 const int DeleteFile(const char* File)
 {
    union REGS InReg;
    union REGS OutReg;

    InReg.h.ah=0x41;
    InReg.x.dx=FP_OFF(File);

    int86(0x21,&InReg,&OutReg);

    return OutReg.x.cflag;
 }

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