C++ Url::IsEmpty方法代码示例

//[-------------------------------------------------------]
//[ Public RTTI methods                                   ]
//[-------------------------------------------------------]
bool VolumeLoaderDAT::Load(Volume &cVolume, File &cFile)
{
	Url cObjectFilename;
	Vector3i vResolution;
	EDataFormat nFormat = DataByte;

	// Get the image holding the volumetric data
	Image &cImage = cVolume.GetVolumeImage();

	{ // Use the tokenizer in order to gather all required information, ignore the rest
		// A "dat"-file (simple ASCII) looks like this
		/*
			ObjectFileName: Teddybear.raw
			TaggedFileName: ---
			Resolution:     128 128 62
			SliceThickness: 2.8 2.8 5
			Format:         UCHAR
			NbrTags:        0
			ObjectType:     TEXTURE_VOLUME_OBJECT
			ObjectModel:    RGBA
			GridType:       EQUIDISTANT
		*/

		// Startup the tokenizer
		Tokenizer cTokenizer;
		cTokenizer.Start(cFile.GetContentAsString());

		// Loop through all tokens
		String sToken = cTokenizer.GetNextToken();
		while (sToken.GetLength()) {
			// ObjectFileName
			if (sToken == "ObjectFileName:") {
				// The file format specification says:
				//	"The object file name refers to the name of the data file, which contains the raw voxel data.
				//	 This can be either an absolute path or a relative path with respect to the storage position of the dat file."

				// Get the value
				cObjectFilename = cTokenizer.GetNextToken();

			// Resolution
			} else if (sToken == "Resolution:") {
				// The file format specification says:
				//	"The volume data set consists of a large array of voxel values. The resolution of the data set is given
				//	 by the number of voxels in x-, y- and z- direction."

				// Get the values
				vResolution.x = cTokenizer.GetNextToken().GetInt();
				vResolution.y = cTokenizer.GetNextToken().GetInt();
				vResolution.z = cTokenizer.GetNextToken().GetInt();

			// SliceThickness
			} else if (sToken == "SliceThickness:") {
				// The file format specification says:
				//	"The size of one voxel in x-, y- and z- direction (usually in millimeters)."

				//						  mm to cm    cm to m
				static const float Scale = 0.1f    *   0.01f;

				// Get the values
				Vector3 vSliceThickness;
				vSliceThickness.x = cTokenizer.GetNextToken().GetFloat()*Scale;
				vSliceThickness.y = cTokenizer.GetNextToken().GetFloat()*Scale;
				vSliceThickness.z = cTokenizer.GetNextToken().GetFloat()*Scale;

				// Set the size of one voxel (without metric, but usually one unit is equal to one meter)
				cVolume.SetVoxelSize(vSliceThickness);

			// Format
			} else if (sToken == "Format:") {
				// The file format specification says:
				//	"The data format of one voxel. Can be either UCHAR (8 bit) or USHORT (16 bit)."

				// Get the value
				const String sFormat = cTokenizer.GetNextToken();
				if (sFormat == "UCHAR")
					nFormat = DataByte;	// Byte (8 bit)
				else if (sFormat == "USHORT")
					nFormat = DataWord;	// Word (16 bit)
			}

			// Next token, please
			sToken = cTokenizer.GetNextToken();
		}
	}

	// Valid settings? If so, open and read in the raw data...
	if (!cObjectFilename.IsEmpty() && vResolution.x > 0 && vResolution.y > 0 && vResolution.z > 0) {
		// The file format specification says:
		//	"The data file simply contains the raw voxel data as a large binary array which is indexed as
		//	 voxel(x,y,z) = array[z * YDIM * XDIM + y * XDIM + x],
		//	 with XDIM, YDIM and ZDIM referring to the resolution of the data set, as specified in line 3
		//	 of the header file. For 16 bit data, the data may be stored either in big endian or little endian format."
		//	-> We expect "Little Endian First"

		// Get the filename of the raw file
		const String sRawFilename = cObjectFilename.IsAbsolute() ? cObjectFilename.GetUrl() : (cFile.GetUrl().CutFilename() + cObjectFilename.GetUrl());

//.........这里部分代码省略.........