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|[AddRef](#addref)|Increments the reference count of the string data object.|

|[data](#data)|Retrieves the character data of a string object.|

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|[nAllocLength](#nalloclength)|Length of allocated data in `XCHAR`s (not including terminating null)|

|[nDataLength](#ndatalength)|Length of currently used data in `XCHAR`s (not including terminating null)|

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|[CStringT::operator =](#operator_eq)|Assigns a new value to a `CStringT` object.|

|[CStringT::operator +](#operator_add)|Concatenates two strings or a character and a string.|

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|[operator + -](#operator_add_-)|These operators add and subtract `CTimeSpan` and `CTime` objects.|

|[operator +=, -=](#operator_add_eq_-_eq)|These operators add and subtract a `CTimeSpan` object to and from this `CTime` object.|

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|[operator + -](#operator_add_-)|Adds and subtracts `CTimeSpan` objects.|

|[operator += -=](#operator_add_eq_-_eq)|Adds and subtracts a `CTimeSpan` object to and from this `CTimeSpan`.|

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|[Allocate](#allocate)|Call this method to allocate a new string data structure.|

|[Clone](#clone)|Call this method to return a pointer to a new string manager for use with another instance of `CSimpleStringT`.|

These functions support manipulation of URLs.

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|[AtlCanonicalizeUrl](#atlcanonicalizeurl)|Canonicalizes a URL, which includes converting unsafe characters and spaces into escape sequences.|

|[AtlCombineUrl](#atlcombineurl)|Combines a base URL and a relative URL into a single, canonical URL.|

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|[CPathT Class](cpatht-class.md)|This class represents a path.|

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|`CPath`|A specialization of [CPathT](cpatht-class.md) using `CString`.|

|`CPathA`|A specialization of [CPathT](cpatht-class.md) using `CStringA`.|

|`CPathW`|A specialization of [CPathT](cpatht-class.md) using `CStringW`.|

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|[ATLPath::AddBackslash](#addbackslash)|This function is an overloaded wrapper for [PathAddBackslash](/windows/win32/api/shlwapi/nf-shlwapi-pathaddbackslashw).|

|[ATLPath::AddExtension](#addextension)|This function is an overloaded wrapper for [PathAddExtension](/windows/win32/api/shlwapi/nf-shlwapi-pathaddextensionw).|

Provides information for the C++ class created to implement the object.

|Term|Definition|

|**Short name**|Sets the abbreviated name for the object. The name that you provide determines the class and **Coclass** names, the file (**.cpp** and **.h**) names, the **Type** name, and the **ProgID**, unless you change those fields individually.|

|**.h file**|Sets the name of the header file for the new object's class. By default, this name is based on the name that you provide in **Short name**. Click the ellipsis button to save the file name to the location of your choice, or to append the class declaration to an existing file. If you select an existing file, the wizard will not save it to the selected location until you click **Finish** in the wizard.<br /><br /> The wizard does not overwrite a file. If you select the name of an existing file, when you click **Finish**, the wizard prompts you to indicate whether the class declaration should be appended to the contents of the file. Click **Yes** to append the file; click **No** to return to the wizard and specify another file name.|

|**Class**|Sets the name of the class that implements the object. This name is based on the name that you provide in **Short name**, preceded by 'C', the typical prefix for a class name.|

These functions support text encoding and decoding.

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|[AtlGetHexValue](#atlgethexvalue)|Call this function to get the numeric value of a hexadecimal digit.|

|[AtlGetVersion](#atlgetversion)|Call this function to get the version of the ATL library that you are using. |