DOCUMENT:Q75338 06-NOV-1999 [win16sdk] TITLE :Determining Windows Version, Mode from MS-DOS App PRODUCT :Microsoft Windows Software Development Kit PROD/VER:WINDOWS:3.1 OPER/SYS: KEYWORDS:kb16bitonly ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows Software Development Kit (SDK) 3.1 ------------------------------------------------------------------------------- SUMMARY ======= The following assembly language code fragment can be used in an MS-DOS- based application to determine if it is running in a Windows MS-DOS window, and if so, which version and mode of Windows is running. test_win proc near ; check for Windows 3.1 mov ax,160ah ; WIN31CHECK int 2fh ; check if running under Win 3.1. or ax,ax jz RunningUnderWin31 ; can check if running in standard ; or enhanced mode ; check for Windows 3.0 enhanced mode mov ax,1600h ; WIN386CHECK int 2fh test al,7fh jnz RunningUnderWin30Enh ; enhanced mode ; check for 3.0 WINOLDAP mov ax,4680h ; IS_WINOLDAP_ACTIVE int 2fh or ax,ax ; running under 3.0 derivative? jnz NotRunningUnderWin ; rule out MS-DOS 5.0 task switcher mov ax,4b02h ; detect switcher push bx push es push di xor bx,bx mov di,bx mov es,bx int 2fh pop di pop es pop bx or ax,ax jz NotRunningUnderWin ; MS-DOS 5.0 task switcher found ; check for standard mode Windows 3.0 mov ax,1605h ; PMODE_START int 2fh cmp cx,-1 jz RunningUnderWin30Std ; check for real mode Windows 3.0 mov ax,1606h ; PMODE_STOP int 2fh ; in case someone is counting ; Real mode Windows 3.0 is running jmp NotRunningUnderWin RunningUnderWin30Std: ; Standard mode Windows 3.0 is running jmp NotRunningUnderWin RunningUnderWin31: ; At this point: CX == 3 means Windows 3.1 enhanced mode ; CX == 2 means Windows 3.1 standard mode jmp NotRunningUnderWin RunningUnderWin30Enh: ; Enhanced mode Windows 3.0 is running NotRunningUnderWin: ret test_win endp MORE INFORMATION ================ Applications for Windows should use the GetWinFlags() function to determine which version of Windows is running. For more information, please see the following article in the Microsoft Knowledge Base: Q131371 Determining System Version from a Windows-Based Application Additional query words: 3.10 ====================================================================== Keywords : kb16bitonly Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310 Version : WINDOWS:3.1 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.