I'm creating a custom shell for Windows 7 / 8. How do I create a custom tray for my shell ? I'm aware that the tray window has the class name "Shell_TrayWnd". I tried creating it on my own and posted "TaskbarCreated" message using PostMessage but I'm not getting "WM_COPYDATA" message in my Tray WndProc. I'm missing out on something? Need help.
The code is as follows:
static LRESULT CALLBACK tray_proc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
if (uMsg == WM_COPYDATA)
{
COPYDATASTRUCT *cpdata = (COPYDATASTRUCT*)lParam;
}
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
int init_tray(void)
{
WNDCLASS wc;
memset(&wc, 0, sizeof(wc));
wc.lpfnWndProc = tray_proc;
wc.hInstance = GetModuleHandle(NULL);
wc.lpszClassName = TEXT("Shell_TrayWnd");
if (!RegisterClass(&wc))
{
return 0;
}
tray_window = CreateWindowEx(
WS_EX_TOOLWINDOW,
wc.lpszClassName,
NULL,
WS_POPUP,
0, 0, 0, 0,
NULL, NULL,
wc.hInstance,
NULL);
if (!tray_window)
return 0;
/* let running apps know that a new tray is around */
PostMessage(HWND_BROADCAST, RegisterWindowMessage(TEXT("TaskbarCreated")), 0, 0);
return 1;
}
Got it working!
SendNotifyMessage(HWND_BROADCAST, RegisterWindowMessage("TaskbarCreated"), 0, 0);
This message is the key. Without this, the Tray WndProc will not get data.
Related
I've started Direct2D from a very simple example.
Acquire the factory and ID2D1HwndRenderTarget, then handle WM_PAINT message to draw just a background with a solid color using "Clear" function.
It's work fine, until I start to move the window. When the window is moving it turns gray like nothing is drawing. I've tried to draw an ellipse, and the result is the same.
How could one present the window content with the window moving?
P.S. In case the code is needed
#include <Windows.h>
#include <d2d1_1.h>
#pragma comment(lib,"d2d1")
ID2D1Factory * d2factory_ptr = NULL;
ID2D1HwndRenderTarget * renderTarget_ptr = NULL;
LRESULT CALLBACK mainWinProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
int WINAPI wWinMain(
HINSTANCE hInstance
, HINSTANCE prevInstance
, LPWSTR cmd
, int nCmdShow
) {
WNDCLASSEX wndClassStruct;
ZeroMemory(&wndClassStruct, sizeof(WNDCLASSEX));
wndClassStruct.cbSize = sizeof(WNDCLASSEX);
wndClassStruct.hbrBackground = (HBRUSH)COLOR_WINDOW;
wndClassStruct.style = CS_HREDRAW | CS_VREDRAW;
wndClassStruct.hInstance = hInstance;
wndClassStruct.lpfnWndProc = mainWinProc;
wndClassStruct.lpszClassName = TEXT("MainWnd");
RegisterClassEx(&wndClassStruct);
RECT windowRect = { 0,0,640,480};
AdjustWindowRectEx(&windowRect, WS_OVERLAPPEDWINDOW, 0, WS_EX_APPWINDOW);
HWND hWnd = CreateWindowEx(WS_EX_APPWINDOW, TEXT("MainWnd"), TEXT("Direct 2D Test Window"), WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_VISIBLE, CW_USEDEFAULT, 0, windowRect.right-windowRect.left, windowRect.bottom-windowRect.top, NULL, NULL, hInstance, 0);
{
D2D1_FACTORY_OPTIONS fo;
ZeroMemory(&fo, sizeof(D2D1_FACTORY_OPTIONS));
IID const factoryIID = IID_ID2D1Factory1;
HRESULT res = S_OK;
if (S_OK != (res = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &factoryIID, &fo, &d2factory_ptr))) {
return 0;
}
RECT clientRect;
GetClientRect(hWnd, &clientRect);
D2D1_RENDER_TARGET_PROPERTIES renderTargetProps;
ZeroMemory(&renderTargetProps, sizeof(D2D1_RENDER_TARGET_PROPERTIES));
renderTargetProps.type = D2D1_RENDER_TARGET_TYPE_DEFAULT;
renderTargetProps.pixelFormat = (D2D1_PIXEL_FORMAT) { DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_PREMULTIPLIED };
renderTargetProps.dpiX = 0;
renderTargetProps.dpiY = 0;
renderTargetProps.usage = D2D1_RENDER_TARGET_USAGE_FORCE_BITMAP_REMOTING;
renderTargetProps.minLevel = D2D1_FEATURE_LEVEL_DEFAULT;
D2D1_HWND_RENDER_TARGET_PROPERTIES hwndRenderProps;
ZeroMemory(&hwndRenderProps, sizeof(D2D1_HWND_RENDER_TARGET_PROPERTIES));
hwndRenderProps.hwnd = hWnd;
hwndRenderProps.pixelSize = (D2D1_SIZE_U) { clientRect.right - clientRect.left, clientRect.bottom - clientRect.top };
hwndRenderProps.presentOptions = D2D1_PRESENT_OPTIONS_NONE;
if (S_OK != (res = d2factory_ptr->lpVtbl->CreateHwndRenderTarget(d2factory_ptr, &renderTargetProps, &hwndRenderProps, &renderTarget_ptr))) {
return 0;
}
}
ShowWindow(hWnd, nCmdShow);
MSG msg;
while (GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
DestroyWindow(hWnd);
if(NULL != renderTarget_ptr)
renderTarget_ptr->lpVtbl->Base.Base.Base.Release((IUnknown*)renderTarget_ptr);
if (NULL != d2factory_ptr)
d2factory_ptr->lpVtbl->Base.Release((IUnknown*)d2factory_ptr);
return 0;
}
LRESULT onPaintMainWindow() {
ID2D1RenderTargetVtbl renderTargetFuncs = renderTarget_ptr->lpVtbl->Base;
ID2D1RenderTarget * This = (ID2D1RenderTarget*)renderTarget_ptr;
D2D1_TAG tag1, tag2;
D2D1_COLOR_F backgroundClr = (D2D1_COLOR_F) { 0.0, 0.5, 1.0, 1.0 };
renderTargetFuncs.BeginDraw(This);
renderTargetFuncs.Clear(This, &backgroundClr);
renderTargetFuncs.EndDraw(This, &tag1, &tag2);
return 0;
}
LRESULT CALLBACK mainWinProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
if (WM_PAINT == uMsg)
return onPaintMainWindow();
if (WM_DESTROY == uMsg) {
PostQuitMessage(0); return 0;
}
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
Configure your WNDCLASSEX to not have a background brush.
Replace this line:
wndClassStruct.hbrBackground = (HBRUSH)COLOR_WINDOW;
With this:
wndClassStruct.hbrBackground = GetStockObject(NULL_BRUSH);
Alternatively, you can modify mainWndProc to swallow the WM_ERASEBKGND messages. It achieves the same effect by not allowing the window to erase itself before issuing a WM_PAINT.
LRESULT CALLBACK mainWinProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
if (WM_PAINT == uMsg)
return onPaintMainWindow();
if (uMsg == WM_ERASEBKGND)
{
// ignore requests to erase the background since the wm_paint
// handler is going to redraw the entire window.
return 0;
}
if (WM_DESTROY == uMsg) {
PostQuitMessage(0); return 0;
}
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
I've starting watching the handmade hero videos and I'm trying to make a win32 window but the CreateWindowEx() function keeps failing.
I checked the error code and I get 1407.
Code is below.
Thanks in advance.
#include <Windows.h>
LRESULT CALLBACK WindowProcedure(
HWND hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam
)
{
LRESULT result;
switch (uMsg)
{
case WM_ACTIVATEAPP:
{
OutputDebugStringA("The window is now active");
break;
}
case WM_SIZE:
{
OutputDebugStringA("The window is now being resized");
break;
}
case WM_CREATE:
{
OutputDebugStringA("The window has been created");
break;
}
default:
{
result = DefWindowProc(hwnd, uMsg, wParam, lParam);
break;
}
}
return result;
};
int CALLBACK WinMain(
HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow
)
{
WNDCLASS GameWindow;
GameWindow.style = CS_OWNDC|CS_HREDRAW|CS_VREDRAW;
GameWindow.lpfnWndProc = WindowProcedure;
GameWindow.hInstance = hInstance;
// HICON hIcon;
GameWindow.lpszClassName = "HandmadeHeroWindowClass";
RegisterClass(&GameWindow);
if (HWND GameWindowHandle = CreateWindowEx(
0,
GameWindow.lpszClassName,
"Handmade Hero",
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
0,
0,
hInstance,
0
))
{
for (;;)
{
MSG message;
BOOL messageResult = GetMessage(&message, GameWindowHandle, 0, 0);
if (messageResult != 0)
{
DispatchMessage(&message);
}
else if (messageResult == 0)
{
break;
}
else
{
// ERROR
}
}
}
else
{
OutputDebugStringA("Couldn't create window");
}
DWORD error = GetLastError();
return 0;
};
Your window procedure returns an uninitialized variable in every path except for default:, this is undefined behavior and failure of window creation is entirely possible.
For WM_CREATE, the documentation says:
If an application processes this message, it should return zero to continue creation of the window.
As Michael noted in the comments, RegisterClass is failing. Same category of mistake, you're passing a WNDCLASS structure leaving most members uninitialized.
Thanks to Remy Lebeau for the answer, the problem was that my WNDCLASS had uninitialized values for all fields except those I changed, this caused the RegisterClass() to fail and consequently the CreateWindowEx() to fail.
I changed WNDCLASS declaration to this:
WNDCLASS GameWindow = {0};
Thanks to everyone who helped.
Here is my code. I'm trying to create an edit control. It's not showing, however. Can some take a look at my code and point out the errors please. I can't figure out where the error is. I feel It might have something to do with the parent child relationship.
#include <cstdlib>
#include <windows.h>
#define MAINWINDOW_CLASS_ID 140;
const char* MAINWINDOW_CLASS_NAME = "Main Window";
const char* TEXTAREA_CLASS_NAME = "EDIT";
using namespace std;
LRESULT CALLBACK WinProc(HWND hwnd, UINT uMsg,
WPARAM wParam, LPARAM lParam);
/*
* Initialize the window class and register it.
*/
BOOL initInstance(HINSTANCE hInstance);
/*
* Create and show the window
*/
HWND initWindow(HINSTANCE hInstance);
HWND createTextArea(HWND hParent);
/*
*
*/
INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hprevInstance, LPSTR lpCmdline, INT cmdlShow)
{
if (!initInstance(hInstance))
return 0;
HWND hwndMain = initWindow(hInstance);
ShowWindow(hwndMain, cmdlShow);
MSG msg = {} ;
while (GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
BOOL initInstance(HINSTANCE hInstance)
{
WNDCLASS wc = {};
wc.lpfnWndProc = WinProc;
wc.hInstance = hInstance,
wc.lpszClassName = MAINWINDOW_CLASS_NAME;
return RegisterClass(&wc);
}
HWND initWindow(HINSTANCE hInstance)
{
HWND hwndMain = CreateWindow(
MAINWINDOW_CLASS_NAME, // The class name
"Text Editor", // The window name
WS_OVERLAPPEDWINDOW,// The window style
CW_USEDEFAULT, // The x pos
CW_USEDEFAULT, // The y pos
CW_USEDEFAULT, // The width
CW_USEDEFAULT, // The height
(HWND) NULL, // Handle to parent
(HMENU) NULL, // Handle to the menu
hInstance, // Handle to the instance
NULL // Window creation data
);
if (!hwndMain) {
return NULL;
}
else {
return hwndMain;
}
}
LRESULT CALLBACK WinProc(HWND hwnd, UINT uMsg,
WPARAM wParam, LPARAM lParam) {
HWND htextArea;
char sztestText[] = "I should be able to see this text.";
switch (uMsg) {
case WM_CREATE:
htextArea = createTextArea(hwnd);
SendMessage(htextArea, WM_SETTEXT, 0, (LPARAM) sztestText);
break;
case WM_PAINT:
break;
case WM_CLOSE:
break;
case WM_SIZE:
RECT rectMainWindow;
GetWindowRect(hwnd, &rectMainWindow);
INT x = rectMainWindow.right - rectMainWindow.left + 50;
INT y = rectMainWindow.bottom - rectMainWindow.top + 50;
MoveWindow(htextArea, 0, 0, x, y, TRUE);
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
/*******************************************************************/
HWND createTextArea(HWND hParent) {
return CreateWindow(
TEXTAREA_CLASS_NAME, // Class control name
NULL, // Title
WS_CHILD | WS_VISIBLE | ES_MULTILINE, // Styles
0, 0, 0, 0, // Sizing and position
hParent,
(HMENU) MAKEINTRESOURCE(100),
(HINSTANCE) GetWindowLong(hParent, GWL_HINSTANCE),
NULL
);
}
You've defined htextArea as a local variable in WinProc and so every time your window procedure is called its value will be uninitialized. You should make it static or move it to global data outside the function.
(The actual problem is that when you get a WM_SIZE message, you've lost the handle to the edit control, and so its size remains as 0,0).
MSDN doc's for MoveWindow() says:
"If the bRepaint parameter is TRUE, the system sends the WM_PAINT message to the window procedure immediately after moving the window (that is, the MoveWindow function calls the UpdateWindow function)."
But when I call GetUpdateRect() after MoveWindow(), while processing the WM_LBUTTONDOWN message in the parent, I get a beep, which shows that the child is invalid. What is the explanation ???
#include <windows.h>
#include <windowsx.h>
#include <tchar.h>
HINSTANCE ghInstance;
LRESULT CALLBACK WindowProc (HWND hwnd, UINT message, UINT wParam, LONG lParam);
LRESULT CALLBACK ChildProc (HWND hwnd, UINT message, UINT wParam, LONG lParam);
int APIENTRY WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow)
{
HWND hWnd;
MSG msg;
WNDCLASSEX wndclassx;
ghInstance = hInstance;
wndclassx.cbSize = sizeof(WNDCLASSEX);
wndclassx.style = 0;
wndclassx.lpfnWndProc = WindowProc;
wndclassx.cbClsExtra = 0;
wndclassx.cbWndExtra = 0;
wndclassx.hInstance = hInstance;
wndclassx.hIcon = 0;
wndclassx.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclassx.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclassx.lpszMenuName = NULL;
wndclassx.lpszClassName = _T("ParentWindow");
wndclassx.hIconSm = NULL;
if( !RegisterClassEx(&wndclassx) ) return 0;
wndclassx.cbSize = sizeof(WNDCLASSEX);
wndclassx.style = 0;
wndclassx.lpfnWndProc = ChildProc;
wndclassx.cbClsExtra = 0;
wndclassx.cbWndExtra = 0;
wndclassx.hInstance = hInstance;
wndclassx.hIcon = 0;
wndclassx.hCursor = 0;
wndclassx.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclassx.lpszMenuName = NULL;
wndclassx.lpszClassName = _T("ChildWindow");
wndclassx.hIconSm = NULL;
if( !RegisterClassEx(&wndclassx) ) return 0;
if( !(hWnd = CreateWindow(_T("ParentWindow"), _T("Parent Window"), WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance,
NULL)) ) return 0;
ShowWindow(hWnd, SW_SHOW);
UpdateWindow(hWnd);
while( GetMessage(&msg, NULL, 0, 0) )
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return (int)msg.wParam;
}
LRESULT CALLBACK WindowProc (HWND hwnd, UINT message, UINT wParam, LONG lParam)
{
HWND hWnd;
switch ( message )
{
case WM_CREATE:
CreateWindow(_T("ChildWindow"), NULL, WS_CHILD | WS_VISIBLE | WS_BORDER, 10, 10, 100, 100, hwnd, (HMENU)0,
ghInstance, NULL);
break;
case WM_LBUTTONDOWN:
hWnd = GetWindow(hwnd, GW_CHILD);
MoveWindow(hWnd, 10, 10, 200, 200, true);
if( GetUpdateRect(hWnd, NULL, FALSE) ) MessageBeep(-1);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, message, wParam, lParam);
}
return 0;
}
LRESULT CALLBACK ChildProc (HWND hwnd, UINT message, UINT wParam, LONG lParam)
{
return DefWindowProc(hwnd, message, wParam, lParam);
}
The MSDN doc's is wrong. MoveWindow() with TRUE doesn't call UpdateWindow() as the documentation says. It just invalidates the window client area. If I call UpdateWindow() just after MoveWindow() the program runs as expected.
I tried it myself and WM_PAINT is triggered before the if(GetUpdateRect()) is. Also, GetUpdateRect returns FALSE for me.
I'm running Visual Studio 2008 on XP.
I guess it could depend on what compiler you are using, what operating system that is used and whatnot. According to the code you passed everything is done in the same thread, but if it is a multithreaded program I think that this could inflict some issues as well.
I have a window with an edit control as its child. The control is in focus. Every time I switch to some other application the control loses the focus (blurs). Do I have to keep track of the focused control in order to manually focus back when returning to the app back again? Or am I doing something wrong? I would expect Windows keeps track of such things automatically but who knows?
I'm on Win32 using plain C. Example:
#include <windows.h>
#define NAME "test"
LRESULT CALLBACK WinProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
HWND edit1, edit2;
switch (msg)
{
case WM_CREATE:
edit1 = CreateWindow("edit", "", WS_CHILD|WS_VISIBLE, 0, 0, 200, 50, hWnd, NULL, NULL, NULL);
edit2 = CreateWindow("edit", "", WS_CHILD|WS_VISIBLE, 250, 0, 200, 50, hWnd, NULL, NULL, NULL);
return 0;
case WM_CLOSE:
DestroyWindow(hWnd);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hWnd, msg, wParam, lParam);
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASS wc;
wc.style = 0;
wc.lpfnWndProc = WinProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);
wc.lpszMenuName = NAME;
wc.lpszClassName = NAME;
RegisterClass(&wc);
HWND win;
win = CreateWindow(NAME, "test", WS_OVERLAPPEDWINDOW, 0, 0, 500, 500, NULL, NULL, hInstance, NULL);
ShowWindow(win, nCmdShow);
UpdateWindow(win);
MSG msg;
while(GetMessage(&msg, NULL, 0, 0) > 0)
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
When another application is made active, your window receives the WM_ACTIVATE notification (wParam set to WA_INACTIVE).
When your application is made active again, your window will receive the WM_ACTIVATE notification again, this time with wParam set to WA_ACTIVE or WA_CLICKACTIVE
Since you're not using the dialog manager, you may need to set focus to the edit control yourself when you're activated.
If in doubt, use Spy++ on a dialog window, and watch the message traffic when the app is deactivated and then activated again.*