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结构4：CWPSTRUCT Structure
The CWPSTRUCT structure defines the message parameters passed to a WH_CALLWNDPROC hook procedure, CallWndProc.
CWPSTRUCT 结构定义了传递给WH_CALLWNDPROC钩子子程CallWndProc的消息参数。
Syntax
typedef struct {
LPARAM lParam;
WPARAM wParam;
UINT message;
HWND hwnd;
} CWPSTRUCT, *PCWPSTRUCT;
lParam / wParam : Specifies additional information about the message. The exact meaning depends on the message value.
指定消息的附加信息。附加的意义取决于message的值。
message : Specifies the message.
指定消息
hwnd : Handle to the window to receive the message.
接收消息的窗体的句柄。
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结构5：DEBUGHOOKINFO Structure
The DEBUGHOOKINFO structure contains debugging information passed to a WH_DEBUG hook procedure, DebugProc.
DEBUGHOOKINFO结构包含有传递给WH_DEBUG钩子子程DebugProc的调试信息。
Syntax
typedef struct {
DWORD idThread;
DWORD idThreadInstaller;
LPARAM lParam;
WPARAM wParam;
int code;
} DEBUGHOOKINFO, *PDEBUGHOOKINFO;
Members成员
idThread
Handle to the thread containing the filter function. 包含过滤方法的线程的句柄。
idThreadInstaller
Handle to the thread that installed the debugging filter function. 安装调试过滤方法的线程的句柄。
lParam / wParam
Specifies the value to be passed to the hook in the lParamparameter of the DebugProc callback function. 指定在DebugProc回调函数的lParam/ wParam 参数中，要传递给钩子的值。
code
Specifies the value to be passed to the hook in the nCodeparameter of the DebugProc callback function. 指定在DebugProc回调函数的nCode 参数中，要传递给钩子的值。
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结构6：EVENTMSG Structure
The EVENTMSG structure contains information about a hardware message sent to the system message queue. This structure is used to store message information for the JournalPlaybackProc callback function.
该结构包含有关于硬件的消息，该消息被发送给系统的消息队列。该结构用来为JournalPlaybackProc回调函数存储消息的信息。
Syntax语法
typedef struct {
UINT message;
UINT paramL;
UINT paramH;
DWORD time;
HWND hwnd;
} EVENTMSG, *PEVENTMSG;
message : Specifies the message.
指定消息。
paramH / paramH : Specifies additional information about the message. The exact meaning depends on the message value.
指定消息的附加信息。附加的意义取决于message的值。
time : Specifies the time at which the message was posted.
消息被传递时的时间 。
hwnd : Handle to the window to which the message was posted.
消息被传给的窗口的句柄。