Code:
// getColorWin32.cpp : Defines the entry point for the application.
//
#include "stdafx.h"
#include "getColorWin32.h"
#include <windows.h>
#include <iostream>
#define MAX_LOADSTRING 100
// Global Variables:
HINSTANCE hInst; // current instance
TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name
// Forward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
void CenterWindow(HWND hwnd)
{
RECT rc;
GetWindowRect(hwnd,&rc);
int nWidth = rc.right - rc.left;
int nHeight = rc.bottom - rc.top;
int X = ((int) GetSystemMetrics(SM_CXFULLSCREEN) - nWidth) /2; // center window horizontally
int Y = ((int) GetSystemMetrics(SM_CYFULLSCREEN) - nHeight) /2; // and vertically
MoveWindow(hwnd,X,Y,nWidth,nHeight,TRUE);
}
COLORREF getColor(void)
{
POINT p;
COLORREF color;
HDC hDC = GetDC(NULL);
BOOL b;
// Get the device context for the screen
if (hDC == NULL)
{
MessageBoxA(0, "Device context can't be found!", "Error", MB_OK | MB_ICONERROR);
return 0;
}
// Get the current cursor position
b = GetCursorPos(&p);
if (!b)
{
MessageBoxA(0, "Can't get the cursor position!", "Error", MB_OK | MB_ICONERROR);
return 0;
}
// Retrieve the color at that position
color = GetPixel(hDC, p.x, p.y);
// Release the device context again
ReleaseDC(GetDesktopWindow(), hDC);
return color;
}
int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
// TODO: Place code here.
MSG msg;
HACCEL hAccelTable;
// Initialize global strings
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_GETCOLORWIN32, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}
hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_GETCOLORWIN32));
// Main message loop:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (int) msg.wParam;
}
//
// FUNCTION: MyRegisterClass()
//
// PURPOSE: Registers the window class.
//
// COMMENTS:
//
// This function and its usage are only necessary if you want this code
// to be compatible with Win32 systems prior to the 'RegisterClassEx'
// function that was added to Windows 95. It is important to call this function
// so that the application will get 'well formed' small icons associated
// with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_GETCOLORWIN32));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = NULL;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassEx(&wcex);
}
//
// FUNCTION: InitInstance(HINSTANCE, int)
//
// PURPOSE: Saves instance handle and creates main window
//
// COMMENTS:
//
// In this function, we save the instance handle in a global variable and
// create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
hInst = hInstance; // Store instance handle in our global variable
// HWND hWnd = CreateWindow(szWindowClass, "Testing", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, 200, 200, NULL, NULL, hInstance, NULL);
HWND hWnd = CreateWindowEx(0,szWindowClass,"Testing", WS_VISIBLE|WS_OVERLAPPEDWINDOW, 0,0,200,200,NULL,NULL,hInstance,NULL);
if (!hWnd)
{
return FALSE;
}
CenterWindow(hWnd);
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
//
// FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
// PURPOSE: Processes messages for the main window.
//
// WM_COMMAND - process the application menu
// WM_PAINT - Paint the main window
// WM_DESTROY - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
switch (message)
{
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_PAINT:
{
hdc = BeginPaint(hWnd, &ps);
POINT p;
BOOL b1 = GetCursorPos(&p);
COLORREF myColor;
int r,g,b;
char szBuffer[512];
// Get the device context for the screen
if (hdc == NULL)
{
MessageBoxA(0, "Device context can't be found!", "Error", MB_OK | MB_ICONERROR);
return 0;
}
while(1)
{
if( GetAsyncKeyState( VK_LBUTTON ) & 1 )
{
myColor = getColor();
//Convert the hex value to rgb values
r = ( myColor >> 16 ) & 0xFF;
g = ( myColor >> 8 ) & 0xFF;
b = myColor & 0xFF;
SetPixel(hdc, p.x, p.y, myColor);
sprintf_s( szBuffer, sizeof( szBuffer ), "My Color is: \nHex: #%X \nDecimal(RGB): %i %i %i", myColor, r, g, b);
MessageBoxA(0, szBuffer, "Results", MB_OK);
ReleaseDC(hWnd, hdc);
}
}
EndPaint(hWnd, &ps);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}