createwindowex | 易学教程

Why I don't see a question mark when I use WS_EX_CONTEXTHELP?

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问题 I am learning WinAPI. MSDN: WS_EX_CONTEXTHELP The title bar of the window includes a question mark. When the user clicks the question mark, the cursor changes to a question mark with a pointer. If the user then clicks a child window, the child receives a WM_HELP message. The child window should pass the message to the parent window procedure, which should call the WinHelp function using the HELP_WM_HELP command. The Help application displays a pop-up window that typically contains help for

How do I obtain the HINSTANCE for the CreateWindowEX function when using it outside of WinMain?

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问题 I am trying to create a popup window when I click a button on my main window, and I am using the CreateWindowEX function for that purpose. However, the CreateWindowEx function recieves the HINSTANCE type variable as its second last parameter. Given that I am making this new window from inside the WndProcedure when a button is being clicked, the HINSTANCE variable in the WinMain function will not be available to me because it is not a global variable. The following code was obtained from the

CreateWindowEx returns NULL

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问题 The following is a portion of my code. Every time I run the program, CreateWindowEx of the SPanel returns NULL , triggering an error. Can anyone see what is wrong with this piece of code? SPanelProc and MainWndProc are declared already, and is of the prototype LRESULT CALLBACK SPanelProc (HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam); . The environment I'm programming in is Visual C++ 2010. Why is CreateWindowEx always returning NULL ? #include <Windows.h> #include <WindowsX.h> LRESULT

WinAPI: Create a window with a specified client area size

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问题 I was wondering how can I create a window using Win32 API with a specific client area size . When trying to create a window using the following piece of code, the entire window is 640x480, with the window's chrome taking some of the client area: HWND hWnd; WNDCLASSEX WndClsEx; ZeroMemory(&WndClsEx, sizeof(WNDCLASSEX)); WndClsEx.cbSize = sizeof(WNDCLASSEX); WndClsEx.style = CS_HREDRAW | CS_VREDRAW; WndClsEx.lpfnWndProc = DefWindowProc; WndClsEx.cbClsExtra = 0; WndClsEx.cbWndExtra = 0; WndClsEx

How do I obtain the HINSTANCE for the CreateWindowEX function when using it outside of WinMain?

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I am trying to create a popup window when I click a button on my main window, and I am using the CreateWindowEX function for that purpose. However, the CreateWindowEx function recieves the HINSTANCE type variable as its second last parameter. Given that I am making this new window from inside the WndProcedure when a button is being clicked, the HINSTANCE variable in the WinMain function will not be available to me because it is not a global variable. The following code was obtained from the WndProcedure callback function: case IDC_BUTTON PRESSED: { const char g_szClassName2[] = "POPWIND";