mdbg can't debug my hello world program

Question

In order to try out mdbg, I have the following simple hello world program:

 // kkk.cs using System; class HelloMain { static public void Main() { Console.WriteLine("Hello"); } }

Compile it with csc /debug kkk.cs, this yields:

 kkk.exe kkk.pdb

I then do (from the visual studio command line):

mdbg kkk.exe

or

mdbg !r kkk.exe

I got:

Error: The request is not supported. (Exception from HRESULT: 0x80070032)

mpeterson · Accepted Answer · 2012-05-21 15:06:28Z

I know this question is super old, but I just ran into this and found the 'fix' for this problem. Adding here for any other Googlers..

I have two directories:

C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\NETFX 4.0 Tools\Mdbg.exe
C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\NETFX 4.0 Tools\x64\Mdbg.exe

Make sure you're launching the correct version (in my case, the x64 version) and doing a 'Run as Administrator' when opening the command prompt.

I wanted the x64 build of mdbg so I followed the instructions above. But after I'd installed the SDK on my Win XP machine there was no .\x64 folder. When I repeated the SDK installation on a Win7 x64 machine the .\x64 folder was created and populated.

Tergiver · Accepted Answer · 2010-10-07 20:59:43Z

7

Try csc /debug /platform:x86 kkk.cs

You're running on 64-bit Windows. Mdbg is a 32-bit process and can only debug 32-bit processes.

answered Oct 7, 2010 at 20:59

Tergiver

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4 Comments

user469591 Over a year ago

It is possible to let mdbg debug x64 binaries? Or, should I use x64 version mdbg? If mdbg is only able to debug x86 applications, is that too limited?

Tergiver Over a year ago

I don't know if there is a 64-bit version of mdgb. I stopped trying to use it shortly after I encountered this same thing. VS is good enough for debugging managed apps 95% of the time. I use Windbg for that 5%.

user469591 Over a year ago

Thanks for the help! It was very helpful! It seems that mdbg is indeed quite limited (if it is this case).

leppie Over a year ago

Argggghhhhhh! Stupid thing just bit me :(

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