Thread: c++ 11 - win32 - make my image class

heres what i did with my class:

Code:

class image
{
private:
    HDC hdcimage=NULL;
    BITMAP bm;
    HBITMAP hbmOld;
public:
    image(HDC img=NULL)
    {
        HBITMAP g_hbmBall =  (HBITMAP)LoadImage(NULL, "C:\\FireDragon.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE|LR_SHARED);
        HDC hdcMem = CreateCompatibleDC(NULL);
        hbmOld = (HBITMAP)SelectObject(hdcMem, g_hbmBall);
        GetObject(g_hbmBall, sizeof(bm), &bm);
    }
    int height()
    {
        return (int)bm.bmHeight;
    }
    int width()
    {
        return (int)bm.bmWidth;
    }
    operator HDC()
    {
        return hdcimage;
    }

    ~image()
    {
        SelectObject(hdcimage, hbmOld);
        DeleteDC(hdcimage);
    }
};
image m;

heres how i use it:

Code:

TransparentBlt(hdcWindow, 0, 0,m.width(), m.height(),(HDC) m, 0, 0,m.width, m.height, GetPixel(m,0,0));

for now, i get these error message:
"cannot convert 'image::width' from type 'int (image:()' to type 'int'"
i don't understand why the error
can anyone explain to me what i'm doing wrong?

Originally Posted by phantomotap

O_o

Syntax is important; take a longer look at that line of code.

Soma

sorry... you have right
thanks for correct me:

Code:

TransparentBlt(hdcWindow, 0, 0,m.width(), m.height(),m, 0, 0,m.width(), m.height(), GetPixel(m,0,0));

but i see 1 problem: the image isn't showed
can you tell me what i'm doing wrong?

Originally Posted by Alpo

Have you looked in to libpng? I have no idea if it's any good or not, but from what I remember SDL_Image uses it for png format representation. You might want to try google too, or have a look at what other libraries are doing. Sorry not to be of more help.

not yet... sorry but i must go back for a while: i'm trying show an icon:

Code:

hdcimage = CreateCompatibleDC(NULL);
            if(hdcimage==NULL)
                MessageBox(NULL,"no HDC","error",MB_OK);
            hicon = (HICON)LoadImage(NULL, "C:\\acrobat.ico", IMAGE_ICON, 0 , 0 , LR_LOADFROMFILE|LR_SHARED);
            if(hicon==NULL)
                MessageBox(NULL,"no icon","error",MB_OK);

            if(DrawIcon(hdcimage,0,0,hicon)==NULL)
                MessageBox(NULL,"icon not drawed","error",MB_OK);
            ICONINFO s;
            GetIconInfo(hicon,&s);
             bm.bmHeight=s.yHotspot;
              bm.bmWidth=s.xHotspot;
              MessageBox(NULL,to_string(s.xHotspot).c_str(),"error",MB_OK);//give 8... so the icon is handled
              MessageBox(NULL,to_string(GetLastError()).c_str(),"error",MB_OK);//give 0(zero)

the icon size is showed, but why the icon isn't showed? is the memory device context correctly created?(but i don't recive NULL)