GetTextExtentPoint32

[DienyduToit]

The Windows API HELP states, in connection with GetTextExtentPoint32,
that --

lpString

Points to the string of text. The string does not need to be zero-terminated, since cbString specifies the length of the string.

This line of code works:

Call GetTextExtentPoint32 (hDC&, tx$+Chr$(0), Len(tx$), apiSz)

If the Chr$(0) is removed, PowerBasic reports a compile time error
about "parameter mismatch". Anyone know of a reason for this?


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[Semen Matusovski]

Dieny --
the second parameter should be Asciiz.
I guess that tx$ is declared as string.
If so, you should use ByCopy tx$ or ByVal StrPtr(tx$)

When you use a$ + b$, compiler converts according declaration automatic. That's why tx$ + CHR$(0) is accepted.



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[Edwin Knoppert]

+++
And you don't need to specify the Chr$( 0 )
PB does that for you..

Don't do: Text$ & Chr$( 0 )

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[email protected]

[DienyduToit]

Thank you, Semen and Edwin -- that works!


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