xceedCompressionClass compress returns xceSuccess but does not compress

[ravi.s]

#43758 |

hi,

I am using Xceedzip.dll COM Component 4.2 for in-memory compression (and I am referring to this documentation).

XceedCompression ^compression = gcnew XceedCompressionClass();
		compression->License("My License Key!");

		xcdCompressionError r_error;
		VARIANT r_dataToCompress;
		VARIANT r_compressedData;
		VARIANT r_uncompressedData;
		SAFEARRAY *r_safeArray;
		char *r_safeArrayData;
		size_t r_length;

		r_length = strlen(loginRequestData);
		r_safeArray = SafeArrayCreateVector(VT_I1, 0, r_length);

		SafeArrayAccessData(r_safeArray, (void**)&r_safeArrayData);
		CopyMemory(r_safeArrayData, loginRequestData, r_length);
		SafeArrayUnaccessData(r_safeArray);

		VariantInit(&r_dataToCompress);
		VariantInit(&r_compressedData);
		VariantInit(&r_uncompressedData);

		r_dataToCompress.vt = VT_ARRAY | VT_I1;
		r_dataToCompress.parray = r_safeArray;

		//r_compressedData.vt = VT_ARRAY | VT_I1;
		//r_compressedData.parray = r_safeArray;

		IntPtr r_intPtrDataToCompress = (IntPtr)&r_dataToCompress;
		Object ^r_dataToCompressObject = Marshal::GetObjectForNativeVariant(r_intPtrDataToCompress);

		IntPtr r_intPtrCompressedData = (IntPtr)&r_compressedData;
		Object ^r_CompressedDataObject = Marshal::GetObjectForNativeVariant(r_intPtrCompressedData);

		r_error = compression->Compress(r_dataToCompressObject, r_CompressedDataObject, VARIANT_TRUE);
		//VariantClear(&r_dataToCompress);
		if (r_error != xcdCompressionError::xceSuccess)
			Console::WriteLine("Error Encountered!");

		if (r_CompressedDataObject != NULL) {
			PrintByteArrayVariant< unsigned char >(&r_compressedData);
		
		} else {
			Console::WriteLine("compressed Data Object NULL !");
		}
		
}

template< class DataType > static void PrintByteArrayVariant(VARIANT * variant)
{
	DataType * data;
	SAFEARRAY * arrayDescriptor;
	int i, count;

	// Get the array descriptor from the variant
	arrayDescriptor = variant->parray;

	// Gain access to the array data
	SafeArrayAccessData(arrayDescriptor, (void **)&data);

	// Get the number of elements in the first dimension of the array
	count = arrayDescriptor->rgsabound[0].cElements / sizeof(DataType);

	int lineThreshold = 32 / sizeof(DataType);
	int groupThreshold = 4 / sizeof(DataType);
	char buffer[16];

	sprintf(buffer, "%%0%dX", sizeof(DataType) * 2);

	for (i = 0; i < count; i++)
	{
		// If we need to change line
		if ((i % lineThreshold) == 0 && i > 0)
			printf("\n");

		// If we need to seperate a group of data
		if ((i % groupThreshold) == 0)
			printf(" ");

		// Access the current index as we would a normal array
		printf(buffer, data[i]);
	}

	// Release access to the array data
	SafeArrayUnaccessData(arrayDescriptor);
}

The return value of the compress method is xceSuccess , but r_compressedData is empty .
Any idea about what might be wrong ? I had a hunch that the key for the library might have expired , but since I get xceSuccess as the return value I doubt that might be the case .

[alexau]

#43763

you have mistake in letter which you wrote, sorry but i dont have time to check it i will do it later but you sould do it too

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