我把看vc遇到的各种鬼全都丢在这里面...!

最近在看一个ClientPrint程序涉及到vc+vb编程，各种以前没有见到过得奇怪的东东我全部摆在这里留念了！

##CWPSTRUCT structure

Defines the message parameters passed to a WH_CALLWNDPROC hook procedure,
CallWndProc.
###Syntax:

typedef struct tagCWPSTRUCT {
  LPARAM lParam;
  WPARAM wParam;
  UINT   message;
  HWND   hwnd;
} CWPSTRUCT, *PCWPSTRUCT, *LPCWPSTRUCT;

###Members:

lParam
　　　Type: LPARAM
　　　Additional information about the message. The exact meaning depends on the message value.
wParam
　　　Type: WPARAM
　　　Additional information about the message. The exact meaning depends 　　　on the message value.
message
　　　Type: UINT
　　　The message.
hwnd
　　　Type: HWND
　　　A handle to the window to receive the message.

##EnumChildWindows

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##CallWndProc callback function

An application-defined or library-defined callback function used with the SetWindowsHookEx function. The system calls this function before calling the window procedure to process a message sent to the thread.

The HOOKPROC type defines a pointer to this callback function. CallWndProc is a placeholder for the application-defined or library-defined function name.
###Syntax

LRESULT CALLBACK CallWndProc(
  _In_  int nCode,
  _In_  WPARAM wParam,
  _In_  LPARAM lParam
);

###Parameters
nCode [in]
　　　Type: int
　　　Specifies whether the hook procedure must process the message. If nCode is
　　　HC_ACTION, the hook procedure must process themessage. If nCode is less
　　　than zero, the hook procedure must passthe message to the CallNextHookEx
　　　function without further processing and must return the value returned by
　　　CallNextHookEx.
wParam [in]
　　　Type: WPARAM
　　　Specifies whether the message was sent by the current thread. If the message
　　　was sent by the current thread, it is nonzero; otherwise, it is zero.
lParam [in]
　　　Type: LPARAM
　　　A pointer to a CWPSTRUCT structure that contains details about the message.
###Return Value
Type: LRESULT
If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.

If nCode is greater than or equal to zero, it is highly recommended that you call CallNextHookEx and return the value it returns; otherwise, other applications that have installed WH_CALLWNDPROC hooks will not receive hook notifications and may behave incorrectly as a result. If the hook procedure does not call CallNextHookEx, the return value should be zero.