Load JPEG,GIF files in VC++ :

Once again it is only for VC++ guys... To load JPEG in VC++ is a headache problem...

Now we can use this function to load JPEG,GIF and all picture file formats...

Header files to be included :

#include <olectl.h>
#include <ole2.h>

All u need is to pass the device context and the filename to it....

This is the function to load the JPEG images

// Function LoadAnImage: accepts a file name

void LoadAnImage(HDC hdc,char* FileName)
{
// Use IPicture stuff to use JPG / GIF files
IPicture* p;
IStream* s;
IPersistStream* ps;
HGLOBAL hG;
void* pp;
FILE* fp;

// Read file in memory
fp = fopen(FileName,"rb");
if (!fp)
return;

fseek(fp,0,SEEK_END);
int fs = ftell(fp);
fseek(fp,0,SEEK_SET);
hG = GlobalAlloc(GPTR,fs);

if (!hG)
{
fclose(fp);
return;
}

pp = (void*)hG;
fread(pp,1,fs,fp);
fclose(fp);

// Create an IStream so IPicture can
// CreateStreamOnHGlobal(hG,false,&s);
CreateStreamOnHGlobal(hG,false,&s);
if (!s)
{
GlobalFree(hG);
return;
}

OleLoadPicture(s,0,false,IID_IPicture,(void**)&p);

if (!p)
{
s->Release();
GlobalFree(hG);
return;
}

s->Release();
GlobalFree(hG);

long hmHeight;
long hmWidth;

HBITMAP hB = 0;

p->get_Handle((unsigned int*)&hB);
p->get_Height(&hmHeight);
p->get_Width(&hmWidth);

p->Render(hdc,0,0,300,300,0,hmHeight,hmWidth,-hmHeight,NULL);
p->Release();

}

How can we use it ?....

From windows SDK ...

HDC hdc = GetDC(hwnd);

LoadAnImage(hdc,"D:\Test.jpg");

ReleaseDC(hdc );

if u are using MFC ,

CClientDC dc(this );

LoadAnImage(dc->m_hDC,"D:test.jpg");

we may pass the control's (command buttons...) device context, which in turn draws the picture over the control.....