// コード
#include<windows.h>
#include"fanctions.h"
#define GSIZE_X 215
#define GSIZE_Y 370

///////////////////////////////////////////////////
// ウィンドウプロシージャ
///////////////////////////////////////////////////
LRESULT CALLBACK WndProc(HWND hwnd , UINT msg , WPARAM wp , LPARAM lp)
{
    HDC hdc;
    PAINTSTRUCT ps;
    static HDC hdc_work;
    static HBITMAP hb_work;

    switch (msg) {
        case WM_CREATE:
            hdc = BeginPaint(hwnd , &ps);
            hdc_work = CreateCompatibleDC(hdc);
            hb_work = (HBITMAP)LoadImage(NULL , TEXT("char.bmp") , IMAGE_BITMAP , 0 , 0 , LR_LOADFROMFILE | LR_CREATEDIBSECTION);
            if(hb_work == NULL) SendMessage(hwnd , WM_DESTROY , 0 , 0);    //取得できなかったら終了
            SelectObject(hdc_work , hb_work);
            EndPaint(hwnd , &ps);
            InvalidateRect(hwnd , NULL , false);
            return 0;

        case WM_PAINT:
            hdc = BeginPaint(hwnd, &ps);    //ウィンドウに描写
            BitBlt(hdc , 10 , 10 , GSIZE_X , GSIZE_Y , hdc_work , 215 , 0 , SRCPAINT);
            BitBlt(hdc , 10 , 10 , GSIZE_X , GSIZE_Y , hdc_work , 0 , 0 , SRCAND);
            EndPaint(hwnd, &ps);
            return 0;

        case WM_RBUTTONUP:
            SendMessage(hwnd , WM_DESTROY , 0 , 0);        //右クリで有無を言わさず終了
            return 0;

        case WM_DESTROY:
            DeleteDC(hdc_work);
            DeleteObject(hb_work);
            PostQuitMessage(0);
            return 0;
    }
    return DefWindowProc(hwnd , msg , wp , lp);
}

    hwnd_desk = GetDesktopWindow();
    hdc_desk = GetDC(hwnd_desk);
    BitBlt(hdc_desk , 10 , 10 , GSIZE_X , GSIZE_Y , hdc_work , 0 , 0 , SRCCOPY);
    ReleaseDC(hwnd_desk , hdc_desk);