Passing display component hWnd to dll

I am working with a 3rd party DLL (Halcon) which opens a display window. Using the User32 library I can manipulate this window, make it a child etc, however it should also be possible to pass the DLL the hWnd reference of a component window for it to display in. I have read that Labview doesn't work with the normal Windows windows, but that there may be specific components that will work. Does anybody know front pannel components that have hWnd references that can be used to display a child window, and how to get that reference out of that compoenent?

Hi!
There is a function called IMAQ Get Window Handle, that is contained in NI Vision Development Module. It returns the operating system handle to an NI Vision external display window. You should create external display with Vision VI's and then you're able to display any image in it. Or you may use CreateWindowEx of user32.dll to build your own window in LabVIEW. Also there are ActiveX and .NET ways to communicate Halcon and LabVIEW. If you import these controls to LV palettes (Tools -> Import -> .NET/ActiveX Controls to Palette...) you'll get simple window in which you are able to display any Halcon images using .NET or ActiveX approach.
See also this and this topics (last 4th answer in second may be useful)...

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/*draven*/;
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www.visecurity.com
www.vartortech.com

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How to pass a struct to a DLL function and accessing it in another VI

Hi friends,
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Message Edited by aajjf on 04-19-2007 05:34 AM

aajjf wrote:
Hi friends,
                   I am new to labview. I need to create a demo program in labview ,for displaying image from our own image capturing system. We have a DLL ( build in VC++) containing functions for capturing image from our system. Now I need to create a VI library for some of functions in DLL and Create a Demo program using those created subvi library . I used "Call Function node" and created some of subvi's.
Some of our DLL functions need to pass struct pointers. Our function prototype will be similar to the following function.
__declspec(dllexport) int __stdcall Initialize( unsigned char *imagebuffer,struct config *Configuration);
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unsigned short   val2;
bool                    val3;
bool                    val4[3];
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And which control can I use to display the image. The image data I get is form of 1-D Array .
The second problem is,
   For passing the structure, I used "Bundle " and filled the bundle with all the datatypes as in my struct and passed to the function. Is it correct ? How to access this bundle after returned from function in another Vi. ie.) How to connect this bundle to the connter pane ?
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Message Edited by aajjf on 04-19-2007 05:34 AM
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Last but not least you can end up with alignment issues. Elements in structures are aligned by every C compiler to a certain value. This value can be defined by the programmer in the project settings or for Visual C through #pragma pack() statements in the C code. The alignment rule says that an variable is aligned to the smaller of the two values that are either a multiple of the variable element size or the alignment setting. Most 32bit code nowadays uses 8 bit default alignment but LabVIEW always uses 1 byte. In your case there is nothing to observe since the large variables are at the beginning. Otherwise you might have had to insert filler elements in the LabVIEW cluster.
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Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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Hi EvgenyP!
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You have me until
Everything is working fine but I am wondering if I can pass an object from a class above JTextArea (like TextComponent).What are you asking for here?
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You want to know if you can modify a class further up in JTextArea's hierarchy, so it has a method that passes an object to another method? Yes, by extending it and implementing the functionality you want.
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