Win32 SDK Basics (7) Case Study on How to Create a Child Window of a Window

What is a child window? When we click a button of a Windows window, such as clicking the close button of the window, a window will often pop up to prompt relevant information. A pop-up window like this is a sub-window of the main window. When we create a child window, we also use CreateWindow or CreateWindowEx API.
Let’s take a look at the function prototype of CreateWindow:

HWND WINAPI CreateWindow(
_In_opt_ LPCTSTR lpClassName,
_In_opt_ LPCTSTR lpWindowName,
_In_ DWORD dwStyle,
_In_ int x,
_In_ int y,
_In_ int nWidth,
_In_ int nHeight,
_In_opt_ HWND hWndParent,
_In_opt_ HMENU hMenu,
_In_opt_ HINSTANCE hInstance,
_In_opt_ LPVOID lpParam
);

Here we only introduce the third parameter dwStyle, which sets the style of the window. When we created the first Windows window in this column, we set the value to WS_OVERLAPPEDWINDOW. This setting means that windows are allowed to overlap. We want to create a child window, which is also achieved by setting the WS_CHILD style of the window. If you need to display a child window, you also need to add the WS_VISIBLE style. If you want to display the sub-window in a pop-up manner (similar to a closing confirmation dialog box), you need to add the WS_POPUP style.
In this column, we will introduce the code of creating the window in this column, add the following code to the main function:

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
_In_opt_ HINSTANCE hPrevInstance,
_In_ LPWSTR lpCmdLine,
_In_ int nCmdShow)
{
// TODO: Place code here.

g_hInstance = hInstance;
BOOL nRet = Register("Main", WndProc);
if (!nRet)
{
MessageBox(NULL, "注册失败", "Infor", MB_OK);
return 0;
}
HWND hWnd = CreateMain("Main", "window");

CreateWindow("Main", "子窗口",
WS_OVERLAPPEDWINDOW|WS_CHILD|WS_VISIBLE|WS_POPUP, CW_USEDEFAULT, CW_USEDEFAULT, 400, 200,
hWnd, NULL, g_hInstance, NULL);


Display(hWnd);
Message();
return 0;
}

Note that the 16th code of the 16th is the use of Createwindow The effect is as follows:

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