DLL中的控制台输出窗口

Question

I am trying to redirect the output from my DLL to an external console window for easy debugging.

I have been told about AllocConsole but I am not able to reproduce it, ie the console window does not appear.

My current environment is Visual Studio 2005.

I tried the following example which is gotten off the Internet,

AllocConsole();
HANDLE han = GetStdHandle(STD_OUTPUT_HANDLE);
WriteConsole(han,"hello",6,new DWORD,0);

yet nothing happens. Can someone point me in the right direction if creating a console window via DLL is possible in the first place.

Thanks in advance!

Answer 1

输出调试字符串的正确方法是通过OutputDebugString() ，并使用适当的调试工具监听输出字符串。

Answer 2

Once loaded, there is nothing special about DLLs, so there is no way that allocating consoles would be any different for a DLL than for the EXE that originally loaded it.

Having said that, a process can be associated with only one console at a time, so if there is already a console attached to the process, then allocating a new one is not going to do anything (I assume you're checking the return value of AllocConsole ? What does it return? What does GetLastError return?)

There are some other possibilities. For example, if your DLL is loaded into a service, then the service will (likely) be running under a different window station to the currently logged-in user so if you create a console window, you won't be able to see it.