Dll Import "Translate C++ --> C#'

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Peter - 16 Oct 2007 13:28 GMT

Hi
I write a POS (point-of-sale) applic. until now i use c# code to open
the cash-drawer.
But now there is a new hardware and i have just a c++ code snip to do
this.

Please can somebody help me to translate this:

#include <windows.h>
// szDeviceName ->Device Driver Name
// CTL_ID-> Control Code

__declspec( dllimport ) DWORD WINAPI DeviceControl(LPSTR szDeviceName,
DWORD CTL_ID);
__declspec( dllimport ) DWORD WINAPI PortwellGetCashDrawerStatus(LPSTR
szDeviceName,DWORD CTL_ID);

void main()
{
DWORD ret; // 0 -> success, -1 -> create file
failed, -2 -> device io control failed

ret = DeviceControl("\\\\.\\FEC_cash", 10);
.....
ret = PortwellGetCashDrawerStatus("\\\\.\\FEC_cash", 11);
...

into C#

is LPSTR a byte[] ?
is DWORD = UInt32 ?
is "\\\\.\\FEC_cash" = @"\\.\FEC_cash"

Thank you
Peter

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Nicholas Paldino [.NET/C# MVP] - 16 Oct 2007 14:24 GMT

Peter,

Here are your declarations that you will use:

[DllImport("dlllocation.dll")]
static extern int DeviceControl([MarshalAs(UnmanagedType.LPStr)] string
szDeviceName, int CTL_ID);

You have to replace "dlllocation.dll" with the name of the dll which the
functions are exported from. This dll has to be located by the LoadLibrary
function if it is not an absolute path. Additionally, if the functions call
SetLastError then you have to set the SetLastError property on the DllImport
attribute.

All of this applies to the PortwellGetCashDrawerStatus function as well.

Signature

- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard.caspershouse.com

> Hi
> I write a POS (point-of-sale) applic. until now i use c# code to open
[quoted text clipped - 31 lines]
> Thank you
> Peter

Reply to this Message

Peter - 16 Oct 2007 15:30 GMT

On 16 Okt., 15:24, "Nicholas Paldino [.NET/C# MVP]"
<m...@spam.guard.caspershouse.com> wrote:

> Peter,
>
[quoted text clipped - 53 lines]
>
> - Zitierten Text anzeigen -

Thank you.
Peter

Reply to this Message

Dll Import "Translate C++ --> C#'

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