Error:windows. H already included.

This is the compiler compile order problem, you put the #include<stdafx.h> in the other included files behind. You search this file and put it all on the front.

Fatal error C1189: #error: WINDOWS. H already included. MFC Apps must not

1. Include <windows.h>

This problem is encountered when compiling under Windows console

1. Include "Winsock2.h"
2. Include <afx.h>//to include this header file because it needs to use CString
3. Include <iostream>

using namespace Std;

Later, the head file contains the position changed under the compilation by

1. Include <afx.h>//to include this header file because it needs to use CString
2. Include "Winsock2.h"
3. Include <iostream>

using namespace Std;

• This is the compiler compile order problem, you put the #include<stdafx.h> in the other included files behind. You search this file and put it all on the front.