How to change the height and width of a png image dynamically using vc++?

Sandhya_BK

Hi,

I m trying to load a png image by giving the dimension of my own.

CImage Image;
Image.Load (L"D:\\Images\\PNG_Images\\Image7.png");

But here what happens is that I m not able to give my own dimensions.My code requires constant changing of dimensions of the image.[code="cpp"]
I tried using libpng.lib in my code.But I dono the keywords for loading the png image after including the lib.

I m using Visual Studio 2010. I m developing in vc++.

How do I load and change the height and width of a png image?

Thankx a ton in advance....

merano

Bei CImage kann man Höhe und Breite mit StretchBlt skalieren:

CString srcfile; //path to jpg source
int hThumb=100; //height of thumbnail
CImage img1,img2;
img1.Load(srcfile);
int h=img1.GetHeight();
int w=img1.GetWidth();
int tnh=hThumb;
int tnw=hThumb*w/h;
int bpp=img1.GetBPP();
img2.Create(tnw,tnh,bpp);
HDC h2=img2.GetDC(); //this returns undefined ?
SetStretchBltMode(h2,HALFTONE);
img1.StretchBlt(h2,0,0,tnw,tnh,SRCCOPY);
img2.Save("tn_"+srcfile);
img2.ReleaseDC();

ref: http://social.msdn.microsoft.com/Forums/en/vcgeneral/thread/674a0bf4-cad3-44be-99f5-10a5e74c1022

Qualitativ soll Gdiplus::Image() (<gdiplus.h>) besser geeignet sein.

MSDN - Cropping and Scaling Images (Windows)
http://msdn.microsoft.com/en-us/library/windows/desktop/ms533828(v=vs.85).aspx