Avoiding an external dll to printf

Kempelen · 10-29-2009, 02:41 AM

Hi

My console application load a DLL via LoadLibrary. When calling this library the dll printf a few lines. Is it possible to avoid the dll to output printing at console from my program?

Thx

Adak · 10-29-2009, 03:18 AM

You can print on a console window, without a dll. Whatever else the dll is doing for you, you'd have to replace that functionality, by using API calls.

You'll need the source code changed, of course.

DeadPlanet · 10-29-2009, 07:38 AM

Before you call the function, redirect stdin to a file (use freopen) and then change it back after calling the function. This function will create a file to redirect the text to, but you can just remove it afterwards.

There are probably other/better ways to do this but this is the only one I can think of at the moment. You may also be able to just change the mode so that the writes to stdin fail but that is most likely undefined.

EDIT: Come to think of it, I'm not 100% sure whether this method will work if the printf call is in another module, but it's worth a try.

10-29-2009, 02:41 AM	#1
Kempelen Registered User Join Date: Feb 2008 Posts: 93	Avoiding an external dll to printf Hi My console application load a DLL via LoadLibrary. When calling this library the dll printf a few lines. Is it possible to avoid the dll to output printing at console from my program? Thx
Kempelen is offline

10-29-2009, 03:18 AM	#2
Adak Registered User Join Date: Sep 2006 Posts: 2,512	You can print on a console window, without a dll. Whatever else the dll is doing for you, you'd have to replace that functionality, by using API calls. You'll need the source code changed, of course.
Adak is offline

10-29-2009, 07:38 AM	#3
DeadPlanet Registered User Join Date: Jan 2009 Posts: 30	Before you call the function, redirect stdin to a file (use freopen) and then change it back after calling the function. This function will create a file to redirect the text to, but you can just remove it afterwards. There are probably other/better ways to do this but this is the only one I can think of at the moment. You may also be able to just change the mode so that the writes to stdin fail but that is most likely undefined. EDIT: Come to think of it, I'm not 100% sure whether this method will work if the printf call is in another module, but it's worth a try.
DeadPlanet is offline

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