C / C++ / MFC

16-Sep-09 3:18

Hi All

how to create new bitmap ?

~~~~~~~~~~~~~Raju~~~~~~~~~~~~~

Code-o-mat16-Sep-09 3:28

16-Sep-09 3:28

By selecting 'New' from the file menu.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Game-point16-Sep-09 3:31

16-Sep-09 3:31

~~~~~~~~~~~~~Raju~~~~~~~~~~~~~

Code-o-mat16-Sep-09 3:33

16-Sep-09 3:33

Please provide a bit more information about what you mean because otherwise we won't be able to help.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Game-point16-Sep-09 3:54

16-Sep-09 3:54

i have one image file which contains 5 buildings ..i want to cut and save only the 5th building ,other four buildings are not shown in the image.

but when we are save the image 5th building not shown other four buildings are shown in the image...

this is my code snippet::

<code>
	HDC pDC=::GetDC(0);
HDC TmpDC=CreateCompatibleDC(pDC);
CImage _image;
_image.Load(_T("//read.tif"));
int width=_image.GetWidth();
int height=_image.GetHeight();
HGDIOBJ TmpObj2 = SelectObject(TmpDC,(HGDIOBJ)(HBITMAP)_image);			
Rectangle(TmpDC, 0,0, width/2, height/2 );
SelectObject(TmpDC,TmpObj2);
_image.Save( _T("D:\\newy.jpg"), Gdiplus::ImageFormatBMP);
::ReleaseDC(NULL,pDC);

</code>

~~~~~~~~~~~~~Raju~~~~~~~~~~~~~

Code-o-mat16-Sep-09 4:16

16-Sep-09 4:16

So let me get this right, you open a tif file, draw a rectangle on it that is suposed to overlap some part of the picture and then you save the image to another file, right? (Btw why do you specify Gdiplus::ImageFormatBMP for the Save call while you are trying to save a jpg?) Your problem is that not the part of the image is overlapped you want? Why don't you move the rectangle then?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Game-point16-Sep-09 4:22

16-Sep-09 4:22

how to create one rectangle piece of image from existing image??

this is doubt Confused | :confused:

~~~~~~~~~~~~~Raju~~~~~~~~~~~~~

Code-o-mat16-Sep-09 5:01

16-Sep-09 5:01

Ah well, create a new bitmap in memory with the required size, blit from the source image to the target image the part you want to cut out and then save this new bitmap.
So something like this:

HDC pDC=::GetDC(0);
HDC TmpDC=CreateCompatibleDC(pDC);
CImage _image;
_image.Load(_T("//read.tif"));
int width=_image.GetWidth();
int height=_image.GetHeight();
HGDIOBJ TmpObj2 = SelectObject(TmpDC,(HGDIOBJ)(HBITMAP)_image);			

int newWidth  = width/2;
int newHeight = height/2;
HDC NewDC = CreateCompatibleDC(TmpDC);
HBITMAP NewBitmap = CreateCompatibleBitmap(TmpDC, newWidth, newHeight);
HGDIOBJ NewTmpObj = SelectObject(NewDC, NewBitmap);

BitBlt(NewDC, 0, 0, newWidth, newHeight, TmpDC, 0, 0, SRCCOPY);

SelectObject(NewDC, NewTmpObj);
DeleteDC(NewDC);

SelectObject(TmpDC,TmpObj2);
::ReleaseDC(NULL,pDC);

CImage newImage;
newImage.Attach(NewBitmap);
newImage.Save( _T("D:\\newy.jpg"), Gdiplus::ImageFormatJPEG);
DeleteObject(NewBitmap); //Is this needed, will CImage destroy the bitmap or not?

I am not saying this code works or if it compiles at all, but it can be a starting point for you to get the idea, good luck.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <