C / C++ / MFC

//<br />
// RtlpNumberOf is a function that takes a reference to an array of N Ts.<br />
//<br />
// typedef T array_of_T[N];<br />
// typedef array_of_T &reference_to_array_of_T;<br />
//<br />
// RtlpNumberOf returns a pointer to an array of N chars.<br />
// We could return a reference instead of a pointer but older compilers do not accept that.<br />
//<br />
// typedef char array_of_char[N];<br />
// typedef array_of_char *pointer_to_array_of_char;<br />
//<br />
// sizeof(array_of_char) == N<br />
// sizeof(*pointer_to_array_of_char) == N<br />
//<br />
// pointer_to_array_of_char RtlpNumberOf(reference_to_array_of_T);<br />
//<br />
// We never even call RtlpNumberOf, we just take the size of dereferencing its return type.<br />
// We do not even implement RtlpNumberOf, we just decare it.<br />
//<br />
// Attempts to pass pointers instead of arrays to this macro result in compile time errors.<br />
// That is the point.<br />
//<br />
extern "C++" // templates cannot be declared to have 'C' linkage<br />
template <typename t,="" size_t="" n=""><br />
char (*RtlpNumberOf( UNALIGNED T (&)[N] ))[N];<br />
<br />
#define RTL_NUMBER_OF_V2(A) (sizeof(*RtlpNumberOf(A)))</typename>

MY_DLL_API UINT MyCustomActionLaunch(MSIHANDLE hMsiModule)
{
	
    MessageBoxW (NULL, L"MyCustomAction launch", L"MyCustomAction", MB_OK);	
    WCHAR msg [500] = {0};
    WCHAR vbuff [1024] = {0};
    DWORD vlen = 1024;
    UINT gp = MsiGetPropertyW(hMsiModule, L"ProgramFilesFolder", vbuff, &vlen);
	
	if(gp == ERROR_SUCCESS )
	{
		 if (wcslen(vbuff) <= 0)
		 {
			<big> MessageBoxW(NULL , L"Zero Bytes",L"MyCustomAction" , MB_OK);</big>		 }
		
		MessageBoxW(NULL, vbuff, L"MyCustomAction", MB_OK);    		

	}	else
	{
		MessageBoxW (NULL, L"Failure", L"MyCustomAction", MB_OK);
    
	}

	return -1;
}

const char* CrypThread::EncryptAes(const char* inputFileName, const char* outputFileName, const char* password)<br />
{<br />
   byte pass[AES::BLOCKSIZE]; <br />
   byte iv[16]; <br />
   byte true_iv[16]; <br />
<br />
   AutoSeededRandomPool rng;<br />
<br />
   try <br />
   {  <br />
      StringSource(password, true, new HashFilter(*(new SHA256), new ArraySink(pass, AES::BLOCKSIZE)));<br />
<br />
      rng.GenerateBlock(iv, 16);<br />
      memset(true_iv, 0, 16);<br />
<br />
      AES::Encryption aesEncryption(pass, CryptoPP::AES::DEFAULT_KEYLENGTH);<br />
      CFB_Mode_ExternalCipher::Encryption cbcEncryption(aesEncryption, iv, 8);<br />
<br />
      StreamTransformationFilter *encryptor;<br />
<br />
      encryptor = new StreamTransformationFilter(cbcEncryption, new FileSink(outputFileName));<br />
      encryptor->Put(iv, 16);<br />
<br />
      FileSource(inputFileName, true, encryptor);<br />
   }<br />
   catch(CryptoPP::Exception &e)<br />
   {<br />
      return e.what();<br />
   }<br />
<br />
   return 0;<br />
}