Getting a DC for an memory image in Axapta

 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.
tturneyAsked:
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quale-kaizenConnect With a Mentor Commented:
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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quale-kaizenCommented:
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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tturneyAuthor Commented:
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.
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quale-kaizenCommented:
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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tturneyAuthor Commented:
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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tturneyAuthor Commented:
quale-kaizen,

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

Tom T.
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