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Getting a DC for an memory image in Axapta

Posted on 2009-03-31
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Last Modified: 2013-11-20
 I am trying to use the BitBlt function within Dynamics AX (Axapta) 3.0 and cannot make it work.  I can load the bitmap I am trying to work with in an image (memory) or container, but these don't have device contexts available.  How can I get a device context for a memory image in Axapta?

Tom T.
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Question by:tturney
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6 Comments
 
LVL 7

Expert Comment

by:quale-kaizen
ID: 24034221
Try the hdc() method of the 'Window' control on your form.
Don't forget to set the 'Auto declaration' property of the control.

Regards,
QK
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Author Comment

by:tturney
ID: 24035088
quale-kaizen,

  Thanks for your reply.  I am trying to do this in a class and it doesn't have a FormWindowControl on it.  Is there a way of creating an hdc for an image, bindata or container?

Tom T.
0
 
LVL 7

Expert Comment

by:quale-kaizen
ID: 24037615
Tom,

You can use the win32 api to create in-memory device context,
not associated with an area on a screen or a printing device.
Normally you would use the CreateCompatibleDC() function for this purpose.

Here is an example (not tested) of how you would do this in X++.
 

   DLL gdi32 = new DLL(@"Gdi32.dll");

    DLLFunction createCompatibleDC = new DLLFunction(gdi32, "CreateCompatibleDC");

    ;

    createCompatibleDC.arg(ExtTypes::DWord);

    createCompatibleDC.returns(ExtTypes::DWord);

    hdc = createCompatibleDC.call(0); //NULL

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Author Comment

by:tturney
ID: 24040001
quale-kaizen,

  Thanks again for your reply. I took what you gave me and tried to make it work on a test form.  The form has a formwindowcontrol named CopyCanvas I'm using to hopefuily display a merged image.  I read a record from our table bscProfileItem that has a container field holding a bitmap.  I then try to merge the bitmap onto the CopyCanvas using BitBlt,  Unfortunately, it doens't seem to be working.  I'm attaching the code piece.  How do I assign the Hdc to the bitmap in the record field?

Tom T.

void clicked()

{

    bscProfileItem   TmpProfile;

    BinData TmpBin = new BinData();

    Int              TmpInt, Hdc;

    WinGDI           TmpGDI;

    DLL Gdi32      = new DLL(@"gdi32.dll");

    DLLFunction      CreateCompatibleDC = new DLLFunction(Gdi32, "CreateCompatibleDC");

    DLLFunction      SelectObject       = new DLLFunction(Gdi32, "SelectObject");

    ;

    CreateCompatibleDC.arg(ExtTypes::DWord);

    CreateCompatibleDC.returns(ExtTypes::DWord);

    SelectObject.arg(ExtTypes::DWORD,ExtTypes::DWORD);

    SelectObject.returns(ExtTypes::DWORD);

    super();

    TmpProfile = bscProfileItem::find("PF000001");

    TmpBin.setData(TmpProfile.Image);

    TmpInt     = TmpBin.size();

    CopyCanvas.lockDC();

    Hdc        = CreateCompatibleDC.Call(0);

    TmpInt     = SelectObject.call(Hdc, TmpBin);

    TmpGDI     = new WinGDI(CopyCanvas.hDC());

    TmpGDI.bitBlt(0,0,CopyCanvas.widthValue(), CopyCanvas.heightValue(), Hdc, 0, 0, 0x00CC0020);

    TmpGDI     = Null;

    CopyCanvas.unlockDC();

}

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LVL 7

Accepted Solution

by:
quale-kaizen earned 500 total points
ID: 24045499
Tom,

The code below is placed on the clicked() method of a button.
It grabs an image from the DB and puts it in the 'in-memory' DC and than applies the bitBlt() function
in order to copy the image from memory to the window control.

Regards,
QK
void clicked()

{

    #WinGDI
 

    WinGdi winGDI;

    int memDC, BMP;

    qk_ImageTable imageTable;       // table containing the images

    Image imageDB = new Image();

    DLL gdi32 = new DLL("GDI32");

    DLLFunction CreateCompatibleDC = new DLLFunction(gdi32, 'CreateCompatibleDC');

    DLLFunction CreateBitmap = new DLLFunction(gdi32, 'CreateBitmap');

    DLLFunction SelectObject = new DLLFunction(gdi32, 'SelectObject');

    DLLFunction DeleteObject  = new DLLFunction(gdi32, 'DeleteObject');
 

    ;
 

    CreateCompatibleDC.arg(ExtTypes::DWord);

    CreateCompatibleDC.returns(ExtTypes::DWord);
 

    CreateBitmap.arg(ExtTypes::DWord);

    CreateBitmap.arg(ExtTypes::DWord);

    CreateBitmap.arg(ExtTypes::DWord);

    CreateBitmap.arg(ExtTypes::DWord);

    CreateBitmap.arg(ExtTypes::DWord);

    CreateBitmap.returns(ExtTypes::DWord);
 

    SelectObject.arg(ExtTypes::DWord);

    SelectObject.arg(ExtTypes::DWord);

    SelectObject.returns(ExtTypes::DWord);
 

    DeleteObject.arg(ExtTypes::DWord);

    DeleteObject.returns(ExtTypes::DWord);
 

    super();
 

    Select FirstOnly imageTable;

    imageDB.setData(imageTable.image);
 

    //paneFst.image(imageDB);

    paneFst.lockDC();   // lock the DC of the window control on the form
 

    memDC = CreateCompatibleDC.call(paneFst.hdc());
 

    BMP = CreateBitmap.call(    paneFst.widthValue(),

                                paneFst.heightValue(),

                                WinApi::getDeviceCaps(paneFst.hDC(), 14),

                                WinApi::getDeviceCaps(paneFst.hDC(), 12),

                                0);
 

    SelectObject.call(memDC, BMP);
 

    imageDB.displayImage(memDC);    // move the image to the in-memory DC
 

    winGDI = new WinGdi(paneFst.hdc());

    winGdi.bitBlt(0, 0, paneFst.widthValue(),paneFst.heightValue(), memDC, 0, 0, #SRCCOPY);
 

    paneFst.unlockDC();

    DeleteObject.call(BMP);

    WinApi::deleteDC(memDC);

}

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Author Closing Comment

by:tturney
ID: 31564809
quale-kaizen,

  Thank you very much for all your help and the code to make it work.

Tom T.
0

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