GetDIBits returning senseless rgb values

Ok, im trying with GetDIBits but i cant make it work.
It always returns senseless values.
I think im missing the purpose of HDC here. Can someone explain this please? I mean, what's it for???
Note:
1) The image is a screenshot which i take just before running the code by pressing 'PrtScreen' button on the keyboard.
2) GetDIBits scans line 500 which, since im on a resolution of 1280x1024, is approximately in the middle of the screen.
3) Color depth is 32bits.

Code:

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#include <iostream>
#include <windows.h>

using namespace std;

int main()
{

    HBITMAP hBitmap;

    if (OpenClipboard(NULL))
    {
        hBitmap = (HBITMAP)GetClipboardData(CF_DIB);
        if (hBitmap == NULL)
        {
            cout << "Failed to get the clipboard data.";
            return 0;
        }
    }
    else
    {
        cout << "Failed to open the clipboard!";
        return 0;
    }

    HDC hdc=CreateCompatibleDC(NULL);

    BITMAPINFO bmi;
    bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    bmi.bmiHeader.biWidth = 1280;
    bmi.bmiHeader.biHeight = 1;
    bmi.bmiHeader.biPlanes = 1;
    bmi.bmiHeader.biBitCount = 32;
    bmi.bmiHeader.biCompression = BI_RGB;
    bmi.bmiHeader.biSizeImage = 0;
    bmi.bmiHeader.biXPelsPerMeter = 0;
    bmi.bmiHeader.biYPelsPerMeter = 0;
    bmi.bmiHeader.biClrUsed = 0;
    bmi.bmiHeader.biClrImportant = 0;
    BYTE scanned[4*1280];

    int returnValue = GetDIBits(hdc,hBitmap,500,1,scanned,&bmi,DIB_RGB_COLORS);

    int r = scanned[2401];
    int g = scanned[2402];
    int b = scanned[2403];

    cout << "returnValue = " << returnValue << "\n";
    cout << "r = " << r << "\n";
    cout << "g = " << g << "\n";
    cout << "b = " << b << "\n";

    CloseClipboard();
    return 0;
}

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Why do you need to call GetDIBits()? Your bitmap RGB values are returned to you when you call GetClipboardData(CF_DIB);

Quote:

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CF_DIB = A memory object containing a BITMAPINFO structure followed by the bitmap bits.

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