Using IRP_MJ_CREATE (handle/createFile/access rom drive)

This is a discussion on Using IRP_MJ_CREATE (handle/createFile/access rom drive) within the C Programming forums, part of the General Programming Boards category; Hello, I'm trying to write some code which uses a handle to access a rom drive on windows xp. The ...

  1. #1
    Registered User
    Join Date
    May 2008
    Posts
    25

    Using IRP_MJ_CREATE (handle/createFile/access rom drive)

    Hello,

    I'm trying to write some code which uses a handle to access a rom drive on windows xp. The code below produces this output, "Error opening drive\.E:"

    The codes not correctly accessing the drive. I've been googling and I think it might be related not issuing IRP_MJ_CREATE to request the use of a handle. According to msdn E (rom drive) should be set out as "\\.\E:"

    Has anyone any code or reference material which could help me in using IRP_MJ_CREATE, if its the problem?


    Many thanks.


    IRP_MJ_CREATE http://msdn.microsoft.com/en-us/library/ms806162.aspx
    CreateFile Function http://msdn.microsoft.com/en-us/libr...58(VS.85).aspx



    Code:
    #include <stdlib.h>   
    #include <string.h> 
    #include <stdio.h>  
    #include <windows.h>
    #include <winioctl.h>
          
    
    
    
    	int main()
    	{   
    		
    		HANDLE device;
    	    char deviceName[20];
    
    		strcpy(deviceName, "\\.\E:");
    
    		device = CreateFile(deviceName, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, 0);
            
    		if(device == INVALID_HANDLE_VALUE) //Error opening drive
    		{
    		   printf("Error opening drive");
    		}
    		
    		printf("%s", deviceName);
    
    		printf("debug1");
    
    
    	}

  2. #2
    Kernel hacker
    Join Date
    Jul 2007
    Location
    Farncombe, Surrey, England
    Posts
    15,677
    You may want to use double backslashes here:
    Code:
    strcpy(deviceName, "\\.\E:");
    As you see from your printout, the name actually in deviceName is "\.E:", which is an illegal name.

    This also makes me doubt that you are a good enough programmer (yet!) to write driver code. It is far harder than writing user-mode code, since anything you do wrong will possibly affect the entire system, both in reliability/stability and correct execution of applications (e.g. you could easily write to a stray pointer and make your entire Windows installation useless).

    If you want advice on how to implement IRP_MJ_CREATE, then I suggest you post your code for it, not just the user-mode side.

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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