Microsoft KB Archive/121416

= PRB: GetPrivateProfileString Generates "Data Type Mismatch" =

Article ID: 121416

Article Last Modified on 11/17/2003

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APPLIES TO


 * Microsoft Visual FoxPro 3.0 Standard Edition
 * Microsoft FoxPro 2.6 Standard Edition
 * Microsoft FoxPro 2.6a Standard Edition

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This article was previously published under Q121416



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.



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: KB121416

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