Microsoft KB Archive/39089

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_gettextposition Should Not Be Used with printf

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Q39089

5.10 6.00 6.00a 6.00ax 7.00 | 5.10 6.00 6.00a | 1.00 1.50 MS-DOS | OS/2 | WINDOWS kbprg -- The information in this article applies to: - The C Run-time (CRT), included with: - Microsoft C for MS-DOS, versions 5.1, 6.0, 6.0a, and 6.0ax - Microsoft C for OS/2, versions 5.1, 6.0, and 6.0a - Microsoft C/C++ for MS-DOS, version 7.0 - Microsoft Visual C++ for Windows, versions 1.0 and 1.5 -- SUMMARY ======= When the graphic routines are being used in a program, they should be used for all output to the screen, including text output. Other C run-time functions for output should not be used. If a C program uses the run-time function _gettextposition, the function _outtext should be used to output text to the screen. Using the function printf causes overwriting of text or blank lines to be inserted on the video screen. MORE INFORMATION ================ The following program results in unpredictable output: #include #include main { struct rccoord rcoord; _clearscreen(_GCLEARSCREEN); printf(&quot;11\n&quot;); printf(&quot;22222222\n&quot;); printf(&quot;333333\n&quot;); printf(&quot;fourth line\n&quot;); printf(&quot;fifth line\n&quot;); rcoord=_gettextposition; printf(&quot;6666\n&quot;); printf(&quot;77777777\n&quot;); } The work around is use _outtext, or a combination of sprintf and _outtext instead of printf. Additional reference words: kbinf 5.10 6.00 6.00a 6.00ax 7.00 1.00 1.50 KBCategory: kbprg KBSubcategory: CRTIss

Keywords : kb16bitonly

Issue type :

Technology : kbVCsearch kbAudDeveloper kbCRT