c++ - CREATESTRUCT 错误 C4430 : missing type specifier - int assumed. 注意 : C++ does not support default-int c:\x\dcd\dcdchild. h 22 1

Question

我正在尝试修改用旧版本的 Visual Studio 编写的项目。我现在使用 Visual Studio 2010。当我打开项目时，它会自动转换为 2010 格式。但是，当我构建它时出现以下错误:

Error 1 error C4430: missing type specifier - int assumed. Note: C++ does not support default-int c:\x\dcd\dcdchild.h 22 1

有问题的文件很小:

// dcdchild.h : header file
//

/////////////////////////////////////////////////////////////////////////////
// CDCDChildWnd frame

class CDCDChildWnd : public CMDIChildWnd
{
    DECLARE_DYNCREATE(CDCDChildWnd)
protected:
    CDCDChildWnd();         // protected constructor used by dynamic creation

// Attributes
public:

// Operations
public:

// Implementation
protected:
    virtual ~CDCDChildWnd();
    virtual CDCDChildWnd::PreCreateWindow(CREATESTRUCT& cs);

    // Generated message map functions
    //{{AFX_MSG(CDCDChildWnd)
        // NOTE - the ClassWizard will add and remove member functions here.
    //}}AFX_MSG
    DECLARE_MESSAGE_MAP()
};

/////////////////////////////////////////////////////////////////////////////

有问题的行是:

virtual CDCDChildWnd::PreCreateWindow(CREATESTRUCT& cs);

我查阅了 CREATESTRUCT 的定义，它是:

typedef struct tagCREATESTRUCT {
  LPVOID    lpCreateParams;
  HINSTANCE hInstance;
  HMENU     hMenu;
  HWND      hwndParent;
  int       cy;
  int       cx;
  int       y;
  int       x;
  LONG      style;
  LPCTSTR   lpszName;
  LPCTSTR   lpszClass;
  DWORD     dwExStyle;
} CREATESTRUCT, *LPCREATESTRUCT;

所以它确实包含变量类型 int。问题是，我该如何解决？

Answer 1

声明 virtual CDCDChildWnd::PreCreateWindow(CREATESTRUCT& cs); 无效。它应该是这样的:

virtual BOOL PreCreateWindow(CREATESTRUCT& cs);