c++ MD5 Hash WINAPI

Hello,

I'm trying to reproduce this example from MSDN: http://msdn.microsoft.com/en-us/library/aa382380%28VS.85%29.aspx

I'm using Windows 8.1 and i''m getting error 87 in CryptGetHashParam api, but i'm sure that i don't have a parameter problem:

bool Md5::HashCrypt(){
	BOOL fileReaded = FALSE;
	BYTE fileBuff[1024];
	DWORD hash = BUFF_MD5;
	BYTE hashBuff[MAX_PATH];	
	//read file content and fill hash object
	while (fileReaded  = ReadFile(fileHandle, fileBuff, BUFF_SIZE, &nBytes, NULL)){
		if (!fileReaded){
			ToClose();
			cout << "ReadFile Fails." << endl;
			return false;
		}
		if (nBytes == 0){
			break;
		}		
		if (!CryptHashData(cryptObject, fileBuff, nBytes, 0)){
			ToClose();
			cout << "CryptHashData Fails." << endl;
			return false;
		}
	}

	CHAR key[] = "0123456789abcdef";
	if (CryptGetHashParam(crypHandle, HP_HASHSIZE, hashBuff, &hash, 0)){
		cout << "-> MD5:\n " << endl;
		for (DWORD i = 0; i < hash; i++){
			printf("%c%c", key[hashBuff[i] >> 4],
				key[hashBuff[i] & 0xf]);
		}

		ToClose();
		return true;
	}
	else{
		DWORD status = GetLastError();
		ToClose();
		cout << "CryptGetHashParam Fails. Error: " << status << endl;
		return false;

	}	
}

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I'm out of idea and Google is not helping. I want to get the md5 hash of my program in run-time and display it.

classes.hmain.cppmd5Functions.cpp