BitBlt(hdcC, x, y, cxSc, cySc, hdcWindow, 0, 0,SRCCOPY);

/**Ouvi a correção, não a rejeiteis e sede sábios. Provérbios 8:33*/

#include <windows.h>
#include "resource.h"

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hI,HINSTANCE hPI,PSTR szCmdLine,int iCmdShow) {
    static TCHAR szAppName[] = TEXT("BitBlt");
    HWND         hwnd;
    MSG          msg;
    WNDCLASS     wndclass;
    wndclass.style         = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc   = WndProc;
    wndclass.cbClsExtra    = 0;
    wndclass.cbWndExtra    = 0;
    wndclass.hInstance     = hI;
    wndclass.hIcon         = LoadIcon(hI, IDI_ICON);
    wndclass.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wndclass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
    wndclass.lpszMenuName  = NULL;
    wndclass.lpszClassName = szAppName;

    if(!RegisterClass(&wndclass)) {
        MessageBox(NULL, TEXT("Error!"),szAppName, MB_ICONERROR);
        return 0;
    }

    hwnd = CreateWindow(
        szAppName,TEXT("GetSystemMetrics(SM_CYCAPTION);"),WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, 500, 300,
        NULL, NULL, hI, NULL
    );
    ShowWindow(hwnd, iCmdShow);
    UpdateWindow(hwnd);
    while(GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage (&msg);
        FreeConsole();
    }
    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
    static int  cxClient, cyClient, cxSc, cySc;
    HDC         hdcC, hdcWindow;
    int         x, y;
    PAINTSTRUCT ps;
    switch(msg) {
        case WM_CREATE:
            cxSc = GetSystemMetrics(SM_CXSIZEFRAME)+GetSystemMetrics(30);
            cySc = GetSystemMetrics(SM_CYSIZEFRAME)+GetSystemMetrics(4);
            return 0;
        case WM_SIZE:
            cxClient = LOWORD(lParam);
            cyClient = HIWORD(lParam);
            return 0;
        case WM_PAINT:
            hdcC = BeginPaint(hwnd, &ps);
            hdcWindow = GetWindowDC(hwnd);
            for(y=0; y<cyClient; y+=cySc)
            for(x=0; x<cxClient; x+=cxSc) {
                BitBlt(hdcC, x, y, cxSc, cySc, hdcWindow, 0, 0,SRCCOPY);
            }
            ReleaseDC(hwnd, hdcWindow);
            EndPaint(hwnd, &ps);
            return 0;
        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
    }
    return DefWindowProc(hwnd, msg, wParam, lParam);
}

/********************Arquivo: resource.h********************/

#define IDI_ICON    101

/********************Arquivo: resource.rc********************/

#include "afxres.h"
#include "resource.h"

MAIN ICON    "icone.ico"

IDI_ICON ICON   "icone.ico"