win32api TextOut()

Question

When I write code for Windows several functions give me error message

"undefined reference to ...",

for example TextOut(...) function generate

"undefined reference to 'TextOut@20' ".

Example:

case WM_KEYDOWN ://cand apas o tasta
       {
          char szName[31];
          HDC  hDC;

          InvalidateRect( hWnd, NULL, TRUE );
          UpdateWindow( hWnd );

          hDC = GetDC( hWnd );
          GetKeyNameText( lParam, szName, 30 );
          TextOut( hDC, 10, 10, szName, lstrlen( szName ) );
          ReleaseDC( hWnd, hDC );
       }
       break;

I use GNU GCC codeblocks - mingw Compiler

Please,somebody tell me why I receive this error message? Thank You.

Do you compile with unicode enabled? Have you checked if with `TextOutA` it compiles? — marcinj, Jun 08 '17 at 11:48
Try Visual Studio Community. Is free and is made for Windows. — zdf, Jun 08 '17 at 12:16
Please [edit] your question to show your compile command - in particular, your link command (which is probably missing one or more libraries that you reference). — Toby Speight, Jun 08 '17 at 15:25
Thank' s to all. I downloaded SDK and then I linked GDI32.lib and now my code is working. — D. Danciu, Jun 08 '17 at 16:13
I disagree with the dupe, as there was a bit more to this specific problem than is addressed in the answers to the other question. Voting to re-open. — Adrian McCarthy, Jun 08 '17 at 19:49

IInspectable · Answer 1 · 2017-06-08T12:18:46.577

The symbol TextOut@20 isn't exported from any library. The symbols are called TextOutA and TextOutW (with appropriate decoration). You are using header files that aren't compatible with the Windows API, and they fail to map TextOut to either TextOutA or TextOutW. Consider using the official SDK.

As an aside: The call to TextOut takes a const TCHAR*, not a const char*. If you wish to use a char array (you shouldn't), call TextOutA. It is recommended to use wchar_t arrays instead, and call TextOutW, though.

win32api TextOut()

1 Answers1