Hook RegSetValueExA 拦截写入注册表

zzage

library Hook;

uses
SysUtils,
windows,
Messages,
StdCtrls,
APIHook in 'APIHook.pas';

type
PData = ^TData;
TData = record
Hook: THandle;
Hooked: Boolean;
end;

var
DLLData : PData;

{------------------------------------}
{过程名:HookProc
{过程功能:HOOK过程
{过程参数:nCode, wParam, lParam消息的相
{ 关参数
{------------------------------------}
procedure HookProc(nCode, wParam, lParam: LongWORD); stdcall;
begin
if not DLLData^.Hooked then
begin
HookAPI;
DLLData^.Hooked := True;
end;
//调用下一个Hook
CallNextHookEx(DLLData^.Hook, nCode, wParam, lParam);
end;

{------------------------------------}
{函数名:InstallHook
{函数功能:在指定窗口上安装HOOK
{函数参数:sWindow:要安装HOOK的窗口
{返回值:成功返回TRUE,失败返回FALSE
{------------------------------------}
function InstallHook(SWindow: LongWORD; memo: tmemo): Boolean; stdcall;
var
ThreadID: LongWORD;
begin
Result := False;
DLLData^.Hook := 0;
ThreadID := GetWindowThreadProcessId(SWindow, nil);
//给指定窗口挂上钩子
DLLData^.Hook := SetWindowsHookEx(WH_GETMESSAGE, @HookProc, Hinstance, ThreadID);
if DLLData^.Hook > 0 then
Result := True//是否成功HOOK
else
exit;
end;

{------------------------------------}
{过程名:UnHook
{过程功能:卸载HOOK
{过程参数:无
{------------------------------------}
procedure UnHook; stdcall;
begin
UnHookAPI;
//卸载Hook
UnhookWindowsHookEx(DLLData^.Hook);
end;

{------------------------------------}
{过程名:DLL入口函数
{过程功能:进行DLL初始化,释放等
{过程参数:DLL状态
{------------------------------------}
procedure MyDLLHandler(Reason: Integer);
var
FHandle : LongWORD;
begin
case Reason of
DLL_PROCESS_ATTACH:
begin //建立文件映射,以实现DLL中的全局变量
FHandle := CreateFileMapping($FFFFFFFF, nil, PAGE_READWRITE, 0, $FFFF, 'MYDLLDATA');
if FHandle = 0 then
if GetLastError = ERROR_ALREADY_EXISTS then
begin
FHandle := OpenFileMapping(FILE_MAP_ALL_ACCESS, False, 'MYDLLDATA');
if FHandle = 0 then exit;
end
else
exit;
DLLData := MapViewOfFile(FHandle, FILE_MAP_ALL_ACCESS, 0, 0, 0);
if DLLData = nil then
CloseHandle(FHandle);
end;
DLL_PROCESS_DETACH:
begin
if Assigned(DLLData) then
begin
UnmapViewOfFile(DLLData);
DLLData := nil;
end;
end;
end;
end;

{$R *.res}
exports
InstallHook, UnHook, HookProc;

begin
DLLProc := @MyDLLHandler;
MyDLLHandler(DLL_PROCESS_ATTACH);
DLLData^.Hooked := False;
end.

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