Drawimage bitblt stretchblt Method for painting PNG Images

Add the code to the onpaint () function in the dialog box:

Take my code as an example:

// Graphics

// Use graphics. drawimage

Void userlist: onpaint ()

{

Cpaintdc DC (this); // device context for painting

// Graphics. drawimage

Crect rect;

Getclientrect (& rect );

Graphics graphics (DC. m_hdc );

// Load the PNG Image

Bitmap background (L ". \ userlist \ classlist_top.png ");

Graphics. drawimage (& background, 0, 0, rect. Width (), rect. Height ());

Cdialog: onpaint ();

}

 

Void userlist: onpaint ()

{

Cpaintdc DC (this); // device context for painting

// Load the PNG Image

Bitmap background (L ". \ userlist \ classlist_top.png ");

// Second Method of Drawing bitblt Original Image

Crect RC;

CDC memdc;

Cbitmap;

Cbitmap * poldbmp = NULL;

Hbitmap;

CDC * PDC = getdc ();

// Bitmap to hbitmap

// Hbitmap to cbitmap *

Background. gethbitmap (color (0, 0), & hbitmap); // bitmap to hbitmap

Cbitmap * cbitmap = cbitmap: fromhandle (hbitmap); // hbitmap to cbitmap *

// Display the image

Memdc. createcompatibledc (PDC );

Poldbmp = memdc. SelectObject (cbitmap );

Getclientrect (& rc );

DC. bitblt (0, 0, rect. Width (), rect. Height (), & memdc, 0, 0, srccopy );

// Releasedc

Memdc. SelectObject (poldbmp );

Memdc. deletedc ();

Cbitmap-> deleteobject ();

Cdialog: onpaint ();

}

 

Void userlist: onpaint ()

{

Cpaintdc DC (this); // device context for painting

// Load the PNG Image

Bitmap background (L ". \ userlist \ classlist_top.png ");

// Method 3 for drawing stretchblt tiled Images

Crect RC;

CDC memdc;

Cbitmap;

Cbitmap * poldbmp = NULL;

Hbitmap;

CDC * PDC = getdc ();

// Bitmap to hbitmap

// Hbitmap to cbitmap *

Background. gethbitmap (color (0, 0), & hbitmap); // bitmap to hbitmap

Cbitmap * cbitmap = cbitmap: fromhandle (hbitmap); // hbitmap to cbitmap *

// Display the image

Memdc. createcompatibledc (PDC );

Poldbmp = memdc. SelectObject (cbitmap );

Getclientrect (& rc );

DC. stretchblt (0, 0, rect. Width (), rect. Height (), & memdc, 0, background. getwidth (), Background. getheight (), srccopy );

// Releasedc

Memdc. SelectObject (poldbmp );

Memdc. deletedc ();

Cbitmap-> deleteobject ();

Cdialog: onpaint ();

}