🚀 go-pugleaf

Hi all, I can use a thread retrieving desktop picture ceaselessly
and draw it on my form, but now i want send my desktop to another
computer on the network, so i want get the image buffer of desktop,
but i don't know how to do it, any hint will be great appreciated.

// My original code, it work ok
void __fastcall TMyGetScreen::Execute()
{
    // MyCanvas = MainForm->PaintBox1->Canvas;
    HDC hdc = GetDC(0); // Get desktop DC

    using namespace std;

    SetStretchBltMode(MyCanvas->Handle, HALFTONE);
    while (!Terminated)
    {
        MyCanvas->Lock();
        StretchBlt(MyCanvas->Handle, 0, 0, 320, 240, hdc, 0, 0, 1024, 768,
SRCCOPY);

        Sleep(50);
        MyCanvas->Unlock();
    }

    ReleaseDC(0, hdc);
}

// new code, it doesn't work, I cann't retrieve the buffer
void __fastcall TMyGetScreen::Execute()
{
    HDC hdc = GetDC(0); // Get desktop DC
    HBITMAP hbmp = CreateCompatibleBitmap(hdc, 1024, 768);

    byte *buffer = new byte[1024*768*3];
    BITMAPINFO bi;
    ZeroMemory(&bi, sizeof(BITMAPINFO));

    while (!Terminated)
    {
        GetDIBits(hdc, hbmp, 0, 768-1,  buffer, &bi, DIB_RGB_COLORS);
        // send buffer here
        SendBuf(buffer, 1024, 768);
    }

    ReleaseDC(0, hdc);
    DeleteObject(hbmp);
    delete [] buffer;
}