If you need to return a string that might contain embedded null characters, use the _RetVal( ) function.

For more information on how to create an API library and integrate it with Visual FoxPro, see Accessing the Visual FoxPro API.

The following example makes two calls to _RetChar( ), demonstrating that control returns to the API routine from _RetChar( ) and that the last _RetChar( ) determines the value returned to Visual FoxPro.

Visual FoxPro Code

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SET LIBRARY TO RETCHAR

C Code

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#include <pro_ext.h> void FAR chars(ParamBlk FAR *parm) { char message[] = "Hello, world"; _RetChar(message); } FoxInfo myFoxInfo[] = { {"CHARS", (FPFI) chars, 0, ""} }; FoxTable _FoxTable = { (FoxTable FAR *) 0, sizeof(myFoxInfo)/sizeof(FoxInfo), myFoxInfo };

Reference

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