很多浏览器有这种功能,实现原理都是一样。发声源基本都来自Flash,比如Flash游戏啦,视频播放器啦等等
而Flash的发声都是通过winmm.dll::waveOutWrite函数来完成,所以,我们只要能“接管”这个函数就行了
下面的代码是以前写的一个模块,针对Flash的静音,代码写的比较粗糙 ^_^
注意,下面的代码仅仅针对Flash模块进行IAT Hook
XP测试通过
- unit FlashMute;
- interface
- uses
- Windows, SysUtils, Classes, StrUtils, TlHelp32, MMSystem;
- type
- TFlashMute = class
- private
- class var Flag: Boolean;
- public
- class function Modify_waveOutWrite: Boolean;
- class procedure Enable;
- class procedure Disable;
- end;
- implementation
- function MywaveOutWrite(hWaveOut: HWAVEOUT; lpWaveOutHdr: PWaveHdr; uSize: UINT): MMRESULT; stdcall;
- begin
- if TFlashMute.Flag then
- ZeroMemory(lpWaveOutHdr.lpData, lpWaveOutHdr.dwBufferLength);
- Result := waveOutWrite(hWaveOut, lpWaveOutHdr, uSize);
- end;
- { TFlashMute }
- class procedure TFlashMute.Disable;
- begin
- TFlashMute.Flag := True;
- end;
- class procedure TFlashMute.Enable;
- begin
- TFlashMute.Flag := False;
- end;
- class function TFlashMute.Modify_waveOutWrite: Boolean;
- var
- hSnapshot: THandle;
- ME32: TModuleEntry32;
- Found: Boolean;
- BaseAddr: DWORD;
- DosHeader: PImageDosHeader;
- NtHeader: PImageNtHeaders;
- ImportDesc: PImageImportDescriptor;
- ITD, ITD2: PImageThunkData;
- IIBN: PImageImportByName;
- mbi: TMemoryBasicInformation;
- begin
- Result := False;
- // 枚举当前进程模块列表,找到Flash?.ocx
- hSnapshot := CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, GetCurrentProcessId);
- if hSnapshot <> INVALID_HANDLE_VALUE then
- begin
- ME32.dwSize := SizeOf(TModuleEntry32);
- Found := Module32First(hSnapshot, ME32);
- while Found do
- begin
- if ContainsText(ME32.szModule, 'Flash') then
- begin
- if SameText(ExtractFileExt(ME32.szModule), '.ocx') then
- begin
- BaseAddr := DWORD(@ME32.modBaseAddr^);
- DosHeader := @ME32.modBaseAddr^;
- NtHeader := Ptr(BaseAddr + DosHeader^._lfanew);
- // 遍历输入模块
- ImportDesc := Ptr(BaseAddr + NtHeader.OptionalHeader.DataDirectory[1].VirtualAddress);
- while ImportDesc^.Name <> 0 do
- begin
- ITD := PImageThunkData(BaseAddr + ImportDesc^.OriginalFirstThunk); // 指向函数名称RVA或函数序号
- ITD2 := PImageThunkData(BaseAddr + ImportDesc^.FirstThunk); // 指向函数地址
- // 遍历输入函数
- while ITD^.AddressOfData <> 0 do
- begin
- // 按函数名方式导入的函数
- if ITD^.AddressOfData and IMAGE_ORDINAL_FLAG <> IMAGE_ORDINAL_FLAG then
- begin
- IIBN := PImageImportByName(BaseAddr + ITD^.AddressOfData);
- // 找出 winmm.dll::waveOutWrite
- if SameText(string(PAnsiChar(@IIBN^.Name[0])), 'waveOutWrite') then
- begin
- if VirtualProtect(@ITD2^._Function, SizeOf(DWORD), PAGE_EXECUTE_READWRITE, @mbi.Protect) then
- begin
- ITD2^._Function := DWORD(@MywaveOutWrite);
- Result := True;
- end;
- Break;
- end;
- end;
- Inc(ITD);
- Inc(ITD2);
- end;
- if Result then
- Break;
- Inc(ImportDesc);
- end;
- end;
- end;
- if Result then
- Break;
- Found := Module32Next(hSnapshot, ME32);
- end;
- CloseHandle(hSnapshot);
- end;
- end;
http://blog.csdn.net/aqtata/article/details/8112092