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Here's an update after several hours of trial and error...
If any of the veterans sees any problems with this, feel free to correct me.
At 01:34 PM 9/22/99 -0700, David Wieringa wrote:
>I've got a working DLL, but I'm having trouble passing my own data back and
>forth.
I've found that values can be passed back and forth between EasyLanguage
(EL) and DLL's by value or by reference.
Currently I'm only doing it by value, but I also have an example of passing
by reference (compliments of TS Developer Support -- currently waiting for
permission to share it -- it has some good info).
When passing by value...
EL DATE is a float
EL TIME is an int
EL OPEN is a float
EL HIGH is a float
EL LOW is a float
EL CLOSE is a float
Passing by value has sufficed for me, since I'm building a C++ vector of
all of the price information inside my DLL and setting my EasyLanguage
studies to a MaxBarsBack of 0.
>Can any provide some examples?
>
>Please provide example code (EasyLanguage and VC++) to accomplish the
>following:
>
>1) pass a DATE from an EasyLanguage study to a 32bit DLL function
C++ CODE:
float PASS_DATE(float theDate) {
return theDate;
}
EASY LANGUAGE CODE:
DefineDLLFunc: "c:\dev\MyDLL.DLL", FLOAT, "PASS_DATE", FLOAT;
theDate = GET_OPEN_VAL(DATE);
>
>2) pass a TIME from an EasyLanguage study to a 32bit DLL function
>
Same as DATE example, but replace float with int and DATE with TIME.
>3) pass a PRICE (O, H, L, C) from an EasyLanguage study to a 32bit DLL
>function
Just like the date.
>4) pass an input to an EasyLanguage study to a 32bit DLL function
Currently the only one I tried was an integer input (e.g. 300). It just
occurred to me that the TS user could input a non-integer if they were
awnry, so I'll probably need to research this more for the safest possible
solution.
>5) pass a result from an EasyLanguage function (e.g. PriceScale) to a 32bit
>DLL function
I haven't tried this yet.
I'm using TS2000i and MS VC++ 5.0.
Hope that saves someone some frusteration.
Dave
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