DOCUMENT:Q121416 20-AUG-1999 [foxpro] TITLE :PRB: GetPrivateProfileString() Generates "Data Type Mismatch" PRODUCT :Microsoft FoxPro PROD/VER:2.5x 2.60 2.60a 3.00 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Visual FoxPro for Windows, version 3.0 - Microsoft FoxPro for Windows, versions 2.x, 2.6, 2.6a ------------------------------------------------------------------------------- SYMPTOMS ======== When you call the GetPrivateProfileString) Windows API function from within FoxPro for Windows and the UDFPARMS setting is REFERENCE, you will receive the error message "Data type mismatch." CAUSE ===== This error occurs because GetPrivateProfileString() is expecting certain parameters to be passed by VALUE. With the UDFPARMS set to REFERENCE, you are sending all parameters by REFERENCE. The GetPrivateProfileString() function returns an error because it is expecting these parameters by VALUE. FoxPro interprets the error as a data type mismatch. RESOLUTION ========== To prevent this behavior, set UDFPARMS to VALUE. MORE INFORMATION ================ Steps to Reproduce Behavior --------------------------- Type the following commands in the Command window: SET LIBRARY TO SYS(2004)+"FOXTOOLS.FLL" MRETURN=REPLICATE(CHR(0), 144) MREGISTER=REGFN("GETPRIVATEPROFILESTRING","CCC@CI","I") MCALL=CALLFN(MREGISTER,"WINDOWS","LOAD","",@MRETURN,256) The last command will return the error message "Data type mismatch." NOTE: A "FOXPROW caused a General Protection Fault in module " error message occurs if UDFPARMS is set to VALUE. Additional query words: VFoxWin FoxWin 2.50 2.50a 2.50b errmsg ====================================================================== Keywords : Technology : kbVFPsearch kbAudDeveloper kbFoxproSearch kbFoxPro260 kbFoxPro260a kbVFP300 Version : 2.5x 2.60 2.60a 3.00 ============================================================================= 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.