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Daniel1983
How do I cheat?
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Joined: 27 May 2018
Posts: 2
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 Posted: Sun May 27, 2018 5:07 pm Post subject: How to call C DLL function from Delphi DLL. |
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| Code: | bool gl_draw_text(uint x, uint y, uint color, uint alpha, char *fmt, ...)
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Is the function in C code.
I added:
| Code: | __declspec( dllexport ) bool gl_draw_text(uint x, uint y, uint color, uint alpha, char *fmt, ...);
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in the .h file (honestly, I have no clue if that is actually right).
In delphi:
| Code: | function DrawFont(
x: LongWord;
y: LongWord;
colour: LongWord;
alpha: LongWord;
thetext: AnsiString
): boolean; stdcall; external 'test.dll' name 'gl_draw_text'; |
But when I use DrawFont... crash. I traced in asm and it is finding gl_draw_text in target dll - but clearly I am doing this very wrong.
I don't know what type "..." is either.
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atom0s
Moderator
 Reputation: 198
Joined: 25 Jan 2006
Posts: 8517
Location: 127.0.0.1
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| Posted: Mon May 28, 2018 3:00 am Post subject: |
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... in C++ is used for variable arguments.
Meaning any number of arguments to fulfill the previous parameters formatting in your case.
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- Retired. |
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Dark Byte
Site Admin
 Reputation: 458
Joined: 09 May 2003
Posts: 25288
Location: The netherlands
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| Posted: Mon May 28, 2018 4:41 am Post subject: |
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try
| Code: |
function DrawFont(
x: LongWord;
y: LongWord;
colour: LongWord;
alpha: LongWord;
thetext: AnsiString
): boolean; cdecl; vararg; external 'test.dll' name 'gl_draw_text';
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Daniel1983
How do I cheat?
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Joined: 27 May 2018
Posts: 2
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| Posted: Mon May 28, 2018 6:39 am Post subject: |
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Thanks for the response Dark Byte!
That rectified the "..." part - but still crash. I think it's the calling part (delphi) where the fail is happening. Something about this extra argument thing the two languages don't like when one is calling the other.
Variable parameters doesnt seem a very stack friendly thing regardless to me.
edit.
Nope. It was my fault. I was calling the function from inside a different thread. Rookie mistake! It works fine now. Thanks Dark Byte. 
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