Smithware Knowledge Base Article #001269: Interfacing GFA-Basic for Windows & WBTRCALL.DLL (Btrieve for Windows (all versions)) <br> NOVELL PROFESSIONAL DEVELOPER <br> APRIL 1993 VOLUME 5 NUMBER 4

Smithware Knowledge Base Article #001269
Updated: 09-24-1997 17:10:23 CST

Topic: Interfacing GFA-Basic for Windows & WBTRCALL.DLL (Btrieve for Windows (all versions))
NOVELL PROFESSIONAL DEVELOPER
APRIL 1993 VOLUME 5 NUMBER 4

Applies to: Technical Articles from Novell's PDS Bullets

To call Btrieve for Windows from a GFA-Basic Windows application, the declaration shown in Figure 3, Part A, must be made in the global section of your code. Since the Position Block, Data Buffer, Data Buffer Length, and Key Buffer parameters need to be FAR pointers, the "l" argument means LONG for the four-byte FAR address. The "w" argument stands for WORD, or two-byte addresses. FIGURE 3: Declaration and Btrieve call for GFA-Basic for Windows Part A: Declaration DLL #10,"C:\WINDOWS\SYSTEM\WBTRCALL.DLL" DecL Word btrcall (w,l,l,l,l,w,w) Pascal EndDLL Part B: Btrieve Call Status& = ^btrcall(opcode&, V:Posblk$, V:DataBuf, V:DataBufLen, V:KeyBuf$, KeyBufLen&, KeyNum&) END of FIGURE 3 The actual Btrieve call to the DLL should look like the call shown in Part B of Figure 3. The "^" character before the btrcall function name tells the GFA compiler that the next variable name is an external function name. The "&" character after the variable name means "integer" in GFA-Basic, just as the "%" sign would in Microsoft Basic. The "V:" designation is equivalent to VARPTR in Microsoft Basic, which stands for "variable pointer."

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