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Transparent Child Windows

nath2099 (7)
As the title suggests, i am trying to create a transparent background child window as a text label over a png button. So far I have this:

vesav.com.au/logo/demo2.jpg

from this code:

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  #include <windows.h>
#include <tchar.h>
#include <objidl.h>
#include "stdafx.h"
#include "gdiplus.h"
#include <iostream>
#include <string>

Gdiplus::Bitmap* m_pBitmap;

#define ID_BTNHI 0
const char windowClassName[] = "myWindowClass";

HWND button;


class inputButton {
	HWND hWnd;
	int xpos, ypos;
public:
	void createButton(HWND,int, int, int);
};

void inputButton::createButton(HWND hWnd, int xpos, int ypos, int nCmdShow) {

	// Create button    
	//HWND hButton1 = CreateWindow(_T("BUTTON"), _T("Test button"), BS_ICON | WS_VISIBLE | WS_CHILD, xpos, ypos, 100, 100, hWnd, (HMENU)1, NULL, NULL);


	HWND hButton1;
	hButton1 = CreateWindowEx(
		0,										// _In_     DWORD     dwExStyle											
		_T("BUTTON"),							// _In_opt_ LPCTSTR   lpClassName
		_T("Test button"),						// _In_opt_ LPCTSTR   lpWindowName
		BS_ICON | WS_VISIBLE | WS_CHILD,		// _In_     DWORD     dwStyle
		xpos,									// _In_     int       x
		ypos,									// _In_     int       y
		100,									// _In_     int       nWidth
		100,									// _In_     int       nHeight
		hWnd,									// _In_opt_ HWND      hWndParent
		NULL,									// _In_opt_ HMENU     hMenu
		NULL,									// _In_opt_ HINSTANCE hInstance
		NULL									// _In_opt_ LPVOID    lpParam
	);




	ShowWindow(hButton1, nCmdShow);
	UpdateWindow(hButton1);


	// Assign image to button
	Gdiplus::Bitmap* m_pBitmap;
	HICON hicon;
	m_pBitmap = Gdiplus::Bitmap::FromFile(L"greySwitch.png");
	m_pBitmap->GetHICON(&hicon);


	LRESULT lr = SendMessage(hButton1, BM_SETIMAGE, IMAGE_ICON, (LPARAM)hicon);


	DWORD Flags1 = WS_EX_COMPOSITED | WS_EX_LAYERED | WS_EX_NOACTIVATE | WS_EX_TOPMOST | WS_EX_TRANSPARENT;
	//DWORD Flags1 =  WS_EX_TRANSPARENT;
	DWORD Flags2 = WS_POPUP;


	HWND hStatic;


	hStatic = CreateWindowEx(
		WS_EX_TRANSPARENT,					// _In_     DWORD     dwExStyle	
		TEXT("Static"),						// _In_opt_ LPCTSTR   lpClassName
		TEXT("text"),						// _In_opt_ LPCTSTR   lpWindowName
		WS_CHILD | WS_VISIBLE,				// _In_     DWORD     dwStyle
		10,									// _In_     int       x
		40,									// _In_     int       y
		80,									// _In_     int       nWidth
		20,									// _In_     int       nHeight
		hButton1,							// _In_opt_ HWND      hWndParent
		NULL,								// _In_opt_ HMENU     hMenu
		NULL,								// _In_opt_ HINSTANCE hInstance
		NULL								// _In_opt_ LPVOID    lpParam
	);

	
	/*
	HRGN GGG = CreateRectRgn(0, 0, 50, 50);
	InvertRgn(GetDC(hStatic), GGG);
	SetWindowRgn(hStatic, GGG, false);

	COLORREF RRR = RGB(255, 0, 0);
	SetLayeredWindowAttributes(hStatic, RRR, (BYTE)0, LWA_COLORKEY);


	ShowWindow(hStatic, nCmdShow);
	UpdateWindow(hStatic);

	DeleteObject(GGG);

	*/

	ShowWindow(hStatic, nCmdShow);
	UpdateWindow(hStatic);

}

LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) {

	int wmId, wmEvent;
	PAINTSTRUCT ps;
	HDC hdc;
	RECT rect;

	switch (msg) {

		case WM_CLOSE:
			DestroyWindow(hWnd);
			break;
		case WM_DESTROY:
			PostQuitMessage(0);
			break;
		case WM_CTLCOLORSTATIC: {
			::MessageBox(NULL, "WM_CTLCOLORSTATIC", "", MB_OK); 

			}
			break;
		case WM_CREATE: {

			}
			break;
		case WM_ERASEBKGND: {
			/*
			GetClientRect(hWnd, &rect);
			FillRect((HDC)wParam, &rect, CreateSolidBrush(RGB(255, 0, 0)));
			*/
		}
		break;
  
		default:
			return DefWindowProc(hWnd, msg, wParam, lParam);
	}
	return 0;
}


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
	FreeConsole(); //Hides console


				   // Initialize GDI+
	Gdiplus::GdiplusStartupInput gdiplusStartupInput;
	ULONG_PTR gdiplusToken;
	GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

	

	WNDCLASSEX wc;
	HWND hWnd;
	MSG Msg;

	// Register window class for main window    
	wc.cbSize = sizeof(WNDCLASSEX);
	wc.style = 0;
	wc.lpfnWndProc = WndProc;
	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
	wc.hInstance = hInstance;
	wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
	wc.lpszMenuName = NULL;
	wc.lpszClassName = windowClassName;
	

	if (!RegisterClassEx(&wc)) {
		::MessageBox(NULL, "Window Registration Failed!", "", MB_OK);
		return 0;
	}

	// Create main window    
	hWnd = CreateWindowEx(
		WS_EX_CLIENTEDGE,
		windowClassName,
		"C++ Win32 Window",
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, CW_USEDEFAULT,
		600, 450,
		NULL, NULL, hInstance, NULL
	);

	if (hWnd == NULL) {
		::MessageBox(NULL, "Window Creation Failed!", "", MB_OK);
	}

	ShowWindow(hWnd, nCmdShow);
	UpdateWindow(hWnd);


	inputButton button1;
	button1.createButton(hWnd, 50, 50,1);
	inputButton button2;
	button2.createButton(hWnd, 150, 50, 1);
	inputButton button3;
	button3.createButton(hWnd, 250, 50, 1);
	inputButton button4;
	button3.createButton(hWnd, 350, 50, 1);





	while (GetMessage(&Msg, NULL, 0, 0) > 0) {
		TranslateMessage(&Msg);
		DispatchMessage(&Msg);
	}
	return Msg.wParam;
}


Any ideas?
rjphares (136)
Try using COLOREF RRR = RGB(255,0,255)
nath2099 (7)
Hi rjphares, I actually commented out that entire section because it didn't seem to do much except turn the main window pink...
rjphares (136)
I think magenta was/is the "standard" color for transparency. If that doesn't work I can try loading the program
nath2099 (7)
It seems to make the main window pink, not the child text windows. In fact the case WM_CTLCOLORSTATIC: and case WM_ERASEBKGND: messages don't seem to be sent when creating those child windows. Do I need another Callback setion for those?

As I said, I'm very new to this, and am quite confused atm lol. Another question, how do I know when one of those buttons are pressed, and which specific button is pressed?

I think the text labels are children of the button windows, which are themselves children of the main window... Is this correct?

And do I need to register the button classes and text labels somehow, as I did the main window?

Thanks again for your help.
Last edited on
rjphares (136)
is this what you are wanting? 
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#include "stdafx.h"

#include <windows.h>
#include <tchar.h>
#include <objidl.h>
#include "gdiplus.h"
#include <iostream>
#include <string>

Gdiplus::Bitmap* m_pBitmap;

#define ID_BTNHI 0
const char windowClassName[] = "myWindowClass";

HWND button;


class inputButton {
	HWND hWnd;
	int xpos, ypos;
public:
	void createButton(HWND, int, int, int);
};

void inputButton::createButton(HWND hWnd, int xpos, int ypos, int nCmdShow) {

	// Create button    
	//HWND hButton1 = CreateWindow(_T("BUTTON"), _T("Test button"), BS_ICON | WS_VISIBLE | WS_CHILD, xpos, ypos, 100, 100, hWnd, (HMENU)1, NULL, NULL);


	HWND hButton1;
	hButton1 = CreateWindowEx(
		0,										// _In_     DWORD     dwExStyle											
		_T("BUTTON"),							// _In_opt_ LPCTSTR   lpClassName
		_T("Test button"),						// _In_opt_ LPCTSTR   lpWindowName
		WS_VISIBLE | WS_CHILD,		// _In_     DWORD     dwStyle
		xpos,									// _In_     int       x
		ypos,									// _In_     int       y
		100,									// _In_     int       nWidth
		100,									// _In_     int       nHeight
		hWnd,									// _In_opt_ HWND      hWndParent
		NULL,									// _In_opt_ HMENU     hMenu
		NULL,									// _In_opt_ HINSTANCE hInstance
		NULL									// _In_opt_ LPVOID    lpParam
	);




	ShowWindow(hButton1, nCmdShow);
	UpdateWindow(hButton1);


	// Assign image to button
	Gdiplus::Bitmap* m_pBitmap;
	HICON hicon;
	m_pBitmap = Gdiplus::Bitmap::FromFile(L"greySwitch.png");
	m_pBitmap->GetHICON(&hicon);


	LRESULT lr = SendMessage(hButton1, BM_SETIMAGE, IMAGE_ICON, (LPARAM)hicon);


	DWORD Flags1 = WS_EX_COMPOSITED | WS_EX_LAYERED | WS_EX_NOACTIVATE | WS_EX_TOPMOST | WS_EX_TRANSPARENT;
	//DWORD Flags1 =  WS_EX_TRANSPARENT;
	DWORD Flags2 = WS_POPUP;


	//HWND hStatic;


	//hStatic = CreateWindowEx(
	//	WS_EX_TRANSPARENT,					// _In_     DWORD     dwExStyle	
	//	TEXT("Static"),						// _In_opt_ LPCTSTR   lpClassName
	//	TEXT("text"),						// _In_opt_ LPCTSTR   lpWindowName
	//	WS_CHILD | WS_VISIBLE,				// _In_     DWORD     dwStyle
	//	10,									// _In_     int       x
	//	40,									// _In_     int       y
	//	80,									// _In_     int       nWidth
	//	20,									// _In_     int       nHeight
	//	hButton1,							// _In_opt_ HWND      hWndParent
	//	NULL,								// _In_opt_ HMENU     hMenu
	//	NULL,								// _In_opt_ HINSTANCE hInstance
	//	NULL								// _In_opt_ LPVOID    lpParam
	//);


	/*
	HRGN GGG = CreateRectRgn(0, 0, 50, 50);
	InvertRgn(GetDC(hStatic), GGG);
	SetWindowRgn(hStatic, GGG, false);

	COLORREF RRR = RGB(255, 0, 0);
	SetLayeredWindowAttributes(hStatic, RRR, (BYTE)0, LWA_COLORKEY);


	ShowWindow(hStatic, nCmdShow);
	UpdateWindow(hStatic);

	DeleteObject(GGG);

	*/

	//ShowWindow(hStatic, nCmdShow);
	//UpdateWindow(hStatic);

}

LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) {

	int wmId, wmEvent;
	PAINTSTRUCT ps;
	HDC hdc;
	RECT rect;

	switch (msg) {

	case WM_CLOSE:
		DestroyWindow(hWnd);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	case WM_CTLCOLORSTATIC: {
		::MessageBox(NULL, (LPCWSTR)"WM_CTLCOLORSTATIC", (LPCWSTR)"", MB_OK);

	}
							break;
	case WM_CREATE: {

	}
					break;
	case WM_ERASEBKGND: {
		/*
		GetClientRect(hWnd, &rect);
		FillRect((HDC)wParam, &rect, CreateSolidBrush(RGB(255, 0, 0)));
		*/
	}
						break;

	default:
		return DefWindowProc(hWnd, msg, wParam, lParam);
	}
	return 0;
}


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
	FreeConsole(); //Hides console


				   // Initialize GDI+
	Gdiplus::GdiplusStartupInput gdiplusStartupInput;
	ULONG_PTR gdiplusToken;
	GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);



	WNDCLASSEX wc;
	HWND hWnd;
	MSG Msg;

	// Register window class for main window    
	wc.cbSize = sizeof(WNDCLASSEX);
	wc.style = 0;
	wc.lpfnWndProc = WndProc;
	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
	wc.hInstance = hInstance;
	wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
	wc.lpszMenuName = NULL;
	wc.lpszClassName = (LPCWSTR)windowClassName;


	if (!RegisterClassEx(&wc)) {
		::MessageBox(NULL, (LPCWSTR)"Window Registration Failed!", (LPCWSTR) "", MB_OK);
		return 0;
	}

	// Create main window    
	hWnd = CreateWindowEx(
		WS_EX_CLIENTEDGE,
		(LPCWSTR)windowClassName,
		(LPCWSTR)"C++ Win32 Window",
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, CW_USEDEFAULT,
		600, 450,
		NULL, NULL, hInstance, NULL
	);

	if (hWnd == NULL) {
		::MessageBox(NULL, (LPCWSTR)"Window Creation Failed!", (LPCWSTR)"", MB_OK);
	}

	ShowWindow(hWnd, nCmdShow);
	UpdateWindow(hWnd);


	inputButton button1;
	button1.createButton(hWnd, 50, 50, 1);
	inputButton button2;
	button2.createButton(hWnd, 150, 50, 1);
	inputButton button3;
	button3.createButton(hWnd, 250, 50, 1);
	inputButton button4;
	button3.createButton(hWnd, 350, 50, 1);





	while (GetMessage(&Msg, NULL, 0, 0) > 0) {
		TranslateMessage(&Msg);
		DispatchMessage(&Msg);
	}
	return Msg.wParam;
}


Also, if not - try moving the forum post to Windows Programming. And there is a freenode channel #winapi(not related to #cplusplus.com) if you have irc. I am also new so getting help from someone with advanced knowledge would be better.
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