Drawimage

[john5632]

I am trying to draw image using bitblt method. When I try to

CBitmap bitmap;
bitmap.LoadBitmap(IDB_BITMAP1);

it works and image is getting drawn but when I use

Bitmap *bitmap = Bitmap::FromFile(L"d:\\Projects\\res\\state.bmp");

It does not draw any image... Pleas help to sort out the problem. I need to draw image directly from path, not from resource and using bitblt only..

[Anu_Bala]

I coded like this for my application.

CString bmpFilePath;
HBITMAP hBmp;
hBmp = (HBITMAP)::LoadImage(NULL,bmpFilePath,IMAGE_BITMAP,0,0,LR_LOADFROMFILE|LR_CREATEDIBSECTION);
CBitmap bmp;
bmp.Attach(hBmp);
CDC dcImage;
if(!dcImage.CreateCompatibleDC(pDC))
return;
BITMAP bm;
CBitmap* pOldBitmap;
bmp.GetBitmap(&bm);
pOldBitmap = dcImage.SelectObject(&bmp);
pDC->BitBlt(350,100, bm.bmWidth, bm.bmHeight, &dcImage, 0, 0, SRCCOPY);
dcImage.SelectObject(pOldBitmap);

Anu

[john5632]

LoadImage is returning NULL? and nothing is getting drawn.

[john5632]

Thanks its working...but what I need to change in code If I load a png/jpg image...

[Anu_Bala]

Check bmp file is avaialble in folder.Otherwise it returns NULL.

Anu

[Chris Meech]

You've not shown the code that actually draws the image, but I'll take a guess at the problem. In your first code snippet, it is a CBitmap instance that will be used for drawing. In your second snippet, it is a pointer to a Bitmap instance that is used. Your drawing code will need to be adjusted accordingly. :)

Chris Meech I am Canadian. [heard in a local bar] In theory there is no difference between theory and practice. In practice there is. [Yogi Berra] posting about Crystal Reports here is like discussing gay marriage on a catholic church’s website.[Nishant Sivakumar]

[enhzflep]

I use this code

// BMP, GIF, JPEG, PNG, TIFF, Exif, WMF, and EMF
HBITMAP mLoadImg(WCHAR *szFilename)
{
HBITMAP result=NULL;

Gdiplus::Bitmap\* bitmap = new Gdiplus::Bitmap(szFilename,false);
bitmap->GetHBITMAP(NULL, &result);
delete bitmap;
return result;

}

Note: You have to startup and shutdown the GDI+ system. I usually do this in apps initialization and destruction (winmain or main if not mfc apps)

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
Gdiplus::GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR gdiplusToken;
Gdiplus::GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

hInst = hInstance;
InitCommonControls();
// The user interface is a modal dialog box
DialogBox(hInstance, MAKEINTRESOURCE(DLG\_MAIN), NULL, (DLGPROC)DialogProc);
Gdiplus::GdiplusShutdown(gdiplusToken);

}

[john5632]

:), basically my motive is to draw image (png/jpg) using bitblt...I will adjust code accordingly.

[Anu_Bala]

See this link.It may help you. http://stackoverflow.com/questions/2490661/how-to-load-png-jpeg-images-using-mfc[^]

Anu

[john5632]

Thank you for help...I am able to draw image. I need your help in one more problem as described below: I need to draw image on the screen using XOR so that diff of 2 images can be draw as a complete image. How to solve this?

[wangafei]

first you can get the path,then set ID and path link！ so，your first method can do it

[ThatsAlok]

MFC by default support only BMP file, however you can take services of different library that suits your need, one of them is gdiplus, search Google for more information

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