compile error on reference arguments to eternal function.

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Resolved compile error on reference arguments to eternal function.

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kevin kevin rowe
PowerBuilder
Thursday, 16 June 2022 10:17 AM UTC

I'm trying to call a simple dll function to measure a piece of text, to see if it will fit in a confined space without being clipped.

I have defined an external DLL in C# and have linked it into the PB source using external function.

In my first attempt, I used float arguments as the C# utility routine uses float, and linked the function using the PB datatype Real. This caused a run time crash with no discernable codes except the usual 'well, that didn't work!' type message from PB.

I altered the DLL code to use int instead and tried to relink it using the Long parameter type but it will not compile now.

I have tried int, long and longlong.

Error message

  ---------- Compiler: Errors (10:40:55)
cobs2.pbl(w_appmain).w_appmain.of_addbutton.46: Error C0116: Reference argument type does not match function definition: getwordwidth
---------- Finished Errors (10:40:55)

function definition in PB

FUNCTION long GetWordWidth(string asString, string asFont, long aiPointsize, ref long aiheight ) LIBRARY "flutils.dll"

To be certain about the conversion, I imported the DLL using the import function.

This is what was generated.

public function long of_getwordwidth(string as_asstring,string as_asfont,long al_aipointsize,ref long al_aiheight);
//*-----------------------------------------------------------------*/
//* .NET function : GetWordWidth
//* Argument:
//* String as_asstring
//* String as_asfont
//* Long al_aipointsize
//* Long al_aiheight
//* Return : Long
//*-----------------------------------------------------------------*/
Return This.getwordwidth(as_asstring,as_asfont,al_aipointsize,ref al_aiheight)
end function

Here is the C# source code. I have independently tested this with a console test harness and I know it works.

public int GetWordWidth(string asString, string asFont, int aiPointsize, ref int aiheight)
{
TextBox tx = new TextBox();
Graphics g = tx.CreateGraphics();
Font stringFont = new Font(asFont, aiPointsize);
SizeF wordbounds;

wordbounds = g.MeasureString(asString, stringFont);

aiheight = Convert.ToInt32(wordbounds.Height);

return Convert.ToInt32(wordbounds.Width);
}

What am I doing wrong?

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