Inerop help

[yuriy_zubarev]

Greetings,

I apologize for re-posting this, but I'm running out of options on my
side.

I've got a DLL that's not COM compatible and I'm stuck using interop
for the first time. I got couple of simple DLL calls all right but
cannot get the most important one to work.

Here is documentation:

---

int LoadSymbol( char*sym, void *data , int max_rec , bool
IGNORE_HOLIDAYS = true , bool RAWDATA = true ,usr_master_def *MasterRec
= 0);

Returns: Number of days loaded. Negative number indicates an error.

Parameters:

sym - Points to the stock symbol to load.

data - Points to an array of type Stock_Record.

max_rec - An integer value...

IGNORE_HOLIDAYS - Boolean value...

RAWDATA - Boolean value...

---

Here is C++ example:

....
char symbol[12];
#define MAX_RECS 10000;
Stock_Record data[MAX_RECS];
....
num = LoadSymbol( symbol , &data[0] , MAX_RECS , FALSE , TRUE , 0 );
....

Here is a definition for Stock_Record struct:

typedef struct
{
char MM;
char DD;
short YY;
float open;
float hi;
float lo;
float cl;
long vol;
char RS;
float oi;

} *LPSTOCK_RECORD , Stock_Record;

I don't know if a definition for Master_Rec is necessary (the last
argument for LoadSymbol function) since they just passed 0 in the
example. Pardon my naivety if it's totally wrong assumption.

Anyway, when I call this function (LoadSymbol) I got a positive number
returned meaning that records have been read. The only problem - they
have no data.

Here is C#:

[DllImport("read er.dll")]
public static extern int LoadSymbol(stri ng symbol, Stock_Record[]
records, int maxDays, bool ignoreHolidays, bool rawData, int
masterRecord);

(I might have screwed up with "int masterRecord" part...). The
following is C# brother of Stock_Record:

[StructLayout(La youtKind.Sequen tial, CharSet=CharSet .Ansi)]
public struct Stock_Record
{
public string MM;
public string DD;
public short YY;
public float open;
public float hi;
public float lo;
public float cl;
public long vol;
public string RS;
public float OI;

}

And some execution code:

....
Stock_Record[] records = new Stock_Record[100];
int daysLoaded = LoadSymbol("MSF T", records, 100, false, true, 0);
....

The situation here is that "records" array contains elements with
default values - Stock_Record doesn't get populated.

Any help would be greatly appreciated (I really mean it).

Thank you.

[ste]

Re: Inerop help

Are you sure your c# Stock_Record matches the sizeof() for the c struct
[color=blue]
> typedef struct // num bytes
> {
> char MM;
> char DD;
> short YY;
> float open;
> float hi;
> float lo;
> float cl;
> long vol;
> char RS;
> float oi;
>
> } *LPSTOCK_RECORD , Stock_Record;[/color]

C' chars are 1 byte and i dont think they map onto C# strings.. which are
probably sizeof( a pointer ) [ a guess ]
Try changing your strings in your mapped record to 'byte' .. eg and make
sure you map the C sizeof(long) to its .net counterpart

The C' short is 2bytes and you should probably use int16 on 32bit machine.




"yuriy_zuba rev" <yuriy_zubarev@ yahoo.ca> wrote in message
news:1139601329 .140831.258290@ o13g2000cwo.goo glegroups.com.. .[color=blue]
> Greetings,
>
> I apologize for re-posting this, but I'm running out of options on my
> side.
>
> I've got a DLL that's not COM compatible and I'm stuck using interop
> for the first time. I got couple of simple DLL calls all right but
> cannot get the most important one to work.
>
> Here is documentation:
>
> ---
>
> int LoadSymbol( char*sym, void *data , int max_rec , bool
> IGNORE_HOLIDAYS = true , bool RAWDATA = true ,usr_master_def *MasterRec
> = 0);
>
> Returns: Number of days loaded. Negative number indicates an error.
>
> Parameters:
>
> sym - Points to the stock symbol to load.
>
> data - Points to an array of type Stock_Record.
>
> max_rec - An integer value...
>
> IGNORE_HOLIDAYS - Boolean value...
>
> RAWDATA - Boolean value...
>
> ---
>
> Here is C++ example:
>
> ...
> char symbol[12];
> #define MAX_RECS 10000;
> Stock_Record data[MAX_RECS];
> ...
> num = LoadSymbol( symbol , &data[0] , MAX_RECS , FALSE , TRUE , 0 );
> ...
>
> Here is a definition for Stock_Record struct:
>
> typedef struct
> {
> char MM;
> char DD;
> short YY;
> float open;
> float hi;
> float lo;
> float cl;
> long vol;
> char RS;
> float oi;
>
> } *LPSTOCK_RECORD , Stock_Record;
>
> I don't know if a definition for Master_Rec is necessary (the last
> argument for LoadSymbol function) since they just passed 0 in the
> example. Pardon my naivety if it's totally wrong assumption.
>
> Anyway, when I call this function (LoadSymbol) I got a positive number
> returned meaning that records have been read. The only problem - they
> have no data.
>
> Here is C#:
>
> [DllImport("read er.dll")]
> public static extern int LoadSymbol(stri ng symbol, Stock_Record[]
> records, int maxDays, bool ignoreHolidays, bool rawData, int
> masterRecord);
>
> (I might have screwed up with "int masterRecord" part...). The
> following is C# brother of Stock_Record:
>
> [StructLayout(La youtKind.Sequen tial, CharSet=CharSet .Ansi)]
> public struct Stock_Record
> {
> public string MM;
> public string DD;
> public short YY;
> public float open;
> public float hi;
> public float lo;
> public float cl;
> public long vol;
> public string RS;
> public float OI;
>
> }
>
> And some execution code:
>
> ...
> Stock_Record[] records = new Stock_Record[100];
> int daysLoaded = LoadSymbol("MSF T", records, 100, false, true, 0);
> ...
>
> The situation here is that "records" array contains elements with
> default values - Stock_Record doesn't get populated.
>
> Any help would be greatly appreciated (I really mean it).
>
> Thank you.
>
>
>
> ---
> avast! Antivirus: Inbound message clean.
> Virus Database (VPS): 0606-4, 10/02/2006
> Tested on: 10/02/2006 22:32:38
> avast! - copyright (c) 1988-2005 ALWIL Software.
> http://www.avast.com
>
>
>[/color]




---
avast! Antivirus: Outbound message clean.
Virus Database (VPS): 0606-4, 10/02/2006
Tested on: 10/02/2006 22:42:27
avast! - copyright (c) 1988-2005 ALWIL Software.

http://www.avast.com