这个 CreateWindowEx 函数有什么问题？
好的，首先概述一下我正在尝试做的事情..
我试图在主父窗口中创建 3 个子窗口，并使用 EnumChildWindow 和 EnumChildProc 枚举它们，我想创建 3 个与父窗口高度相同的子窗口但是 1/3 宽度，并将它们一个接一个地对齐。
因此，我捕获了 WM_CREATE 消息来创建这些子窗口，并捕获了 WM_SIZE 来移动并使用 MoveWindow 对齐它们，除了没有创建子窗口之外，一切都很好。当我调试它时，我发现（在 Visual Studio 2008 的自动窗口中，调试时）我的 CreateWindowEx 语句没有被执行（自动窗口显示“无法计算表达式”。
这是该语句：
CreateWindowEx(0, (LPCWSTR)("childClass"), (LPCWSTR)NULL, WS_CHILD | WS_BORDER, 0, 0, 0, 0, hWnd, (HMENU) (int) (ID_FIRSTCHILD + 1), hInst, NULL);
当然，我在 for 循环中使用它来创建 3 个窗口，但这是另一回事......
那么，有人可以帮助/指导/建议我这里发生了什么吗？或者我做错了什么？
ps：我正在阅读这本电子书，从我获得此代码和所有内容的地方，所以请不要要求我采用其他方法或其他方法，比如将子创建代码放在其他地方等等......因为我没有制作任何程序，但只是按照书上的例子...:)
Okay, so first a little overview of what I am tryna do..
I am trying to create 3 child window in a main parent window, and use EnumChildWindow and EnumChildProc to enumerate them, I want to create 3 child windows of same height as of parent but 1/3rd width, and align them one after the other..
So, I captured the WM_CREATE msg to create those child window, and WM_SIZE to move and align them using MoveWindow, everything is fine except for the fact that no child window is created. When I debugged it, I found that (in the Autos Window in Visual Studio 2008, while debugging) my CreateWindowEx statement is not getting executed (the autos window said "Expression cannot be evaluated."
Here's the statement:
CreateWindowEx(0, (LPCWSTR)("childClass"), (LPCWSTR)NULL, WS_CHILD | WS_BORDER, 0, 0, 0, 0, hWnd, (HMENU) (int) (ID_FIRSTCHILD + 1), hInst, NULL);
of course I was using it in a for loop to create 3 windows, but that's the other thing...
So, can anyone please help/guide/advice me what is going on in here? Or what am I doing wrong?
ps: I am reading this ebook from where I got this code and all, so please don't ask me to adopt another approach or something, say put the Child creation code somewhere else or so... because I am not making any program, but just following a book's example... :)
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我的通灵能力建议您需要将 WS_VISIBLE 样式传递给上面的子窗口的 CreateWindow 调用 - 这样您就可以看到它们。 :)
我的开发经验表明：
CreateWindowEx 的返回值是多少？您是否将返回值分配给变量。如果是这样，您是否在调试器中的该行上设置了断点？如果 CreateWindow 的返回值为 NULL，那么 GetLastError 是什么（您可以在调试器中将其计算为“@err”）。
主窗口弹出后（子窗口不可见），您是否运行 Spy++ 来查看子窗口是否存在？他们的状态如何？
否则，您是否验证子窗口类的 WndProc 的 WM_CREATE 回调被调用？
My psychic powers suggest you need to pass in the WS_VISIBLE style to the CreateWindow call above for your child windows - so you can seem them. :)
My development experience suggests the following:
What is the return value of CreateWindowEx? Did you assign the return value to a variable. And if so, did you set a breakpoint on that line in the debugger? And if the return value from CreateWindow is NULL, then what is GetLastError (which you can evaluate in the debugger as "@err").
After your main window pops up (with the children invisible), did you run Spy++ to see if the child windows exist? What is their state?
Otherwise, did you validate that the WM_CREATE callback of the WndProc of your child window class is getting called?