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CMFCCmdUsageCount Class

  • Artikkeli

Tracks the usage count of Windows messages, such as when the user selects an item from a menu.

Syntax

class CMFCCmdUsageCount : public CObject

Members

Public Constructors

Name Description
CMFCCmdUsageCount::CMFCCmdUsageCount Default constructor.
CMFCCmdUsageCount::~CMFCCmdUsageCount Destructor.

Public Methods

Name Description
CMFCCmdUsageCount::AddCmd Increments by one the counter that is associated with the given command.
CMFCCmdUsageCount::GetCount Retrieves the usage count that is associated with the given command ID.
CMFCCmdUsageCount::HasEnoughInformation Determines whether this object has collected the minimum amount of tracking data.
CMFCCmdUsageCount::IsFreqeuntlyUsedCmd Determines whether the given command is frequently used.
CMFCCmdUsageCount::Reset Clears the usage count of all commands.
CMFCCmdUsageCount::Serialize Reads this object from an archive or writes it to an archive. (Overrides CObject::Serialize.)
CMFCCmdUsageCount::SetOptions Sets the values of shared CMFCCmdUsageCount class data members.

Data Members

Name Description
m_CmdUsage A CMap object that maps commands to their usage counts.
m_nMinUsagePercentage The minimum usage percentage for a command to be frequently used.
m_nStartCount The start counter that is used to determine whether this object has collected the minimum amount of tracking data.
m_nTotalUsage The count of all tracked commands.

Remarks

The CMFCCmdUsageCount class maps each numeric Windows message identifier to a 32-bit unsigned integer counter. CMFCToolBar uses this class to display frequently-used toolbar items. For more information about CMFCToolBar, see CMFCToolBar Class.

You can persist CMFCCmdUsageCount class data between runs of your program. Use the CMFCCmdUsageCount::Serialize method to serialize class member data and the CMFCCmdUsageCount::SetOptions method to set shared member data.

Inheritance Hierarchy

CObject

CMFCCmdUsageCount

Requirements

Header: afxcmdusagecount.h

CMFCCmdUsageCount::AddCmd

Increments by one the counter that is associated with the given command.

void AddCmd(UINT uiCmd);

Parameters

uiCmd
[in] Specifies the command counter to increment.

Remarks

This method adds a new entry to the map structure of command counts, m_CmdUsage, if the entry does not already exist.

This method does nothing in the following cases:

  • The toolbar framework is in customization mode (the CMFCToolBar::IsCustomizeMode method returns a nonzero value).

  • The command refers to a submenu or menu separator ( uiCmd equals 0 or -1).

  • uiCmd refers to a standard command (the global IsStandardCommand function returns a nonzero value).

CMFCCmdUsageCount::GetCount

Retrieves the usage count that is associated with the given command ID.

UINT GetCount(UINT uiCmd) const;

Parameters

uiCmd
[in] The ID of the command counter to retrieve.

Return Value

The usage count that is associated with the given command ID.

CMFCCmdUsageCount::HasEnoughInformation

Determines whether this object has received the minimum amount of tracking data.

BOOL HasEnoughInformation() const;

Return Value

Nonzero if this object has received the minimum amount of tracking data; otherwise 0.

Remarks

This method returns a nonzero value if the total count, m_nTotalUsage, of all tracked commands is equal to or larger than the initial count, m_nStartCount. By default, the framework sets the initial count 0. You can override this value by using the CMFCCmdUsageCount::SetOptions method.

This method is used by CMFCMenuBar::IsShowAllCommands to determine whether to show all available menu commands.

CMFCCmdUsageCount::IsFreqeuntlyUsedCmd

Determines whether the given command is frequently used.

BOOL IsFreqeuntlyUsedCmd(UINT uiCmd) const;

Parameters

uiCmd
[in] Specifies the command to check.

Return Value

Nonzero if the command is frequently used; otherwise 0.

Remarks

This method returns 0 if the total command usage, m_nTotalUsage, is 0. Otherwise, this method returns nonzero if the percentage of which the specified command is used is larger than the minimum percentage, m_nMinUsagePercentage. By default, the framework sets the minimum percentage to 5. You can override this value by using the CMFCCmdUsageCount::SetOptions method. If the minimum percentage is 0, this method returns nonzero if the specified command count is larger than 0.

CMFCToolBar::IsCommandRarelyUsed uses this method to determine whether a command is rarely used.

CMFCCmdUsageCount::Reset

Clears the usage count of all commands.

void Reset();

Remarks

Call this method to clear all entries from the map structure of command counts, m_CmdUsage, and to reset the total command usage, m_nTotalUsage, counter to 0.

CMFCCmdUsageCount::Serialize

Reads this object from an archive, or writes it to an archive.

virtual void Serialize(CArchive& ar);

Parameters

ar
[in] A CArchive object to serialize from or to.

Remarks

This method serializes the map structure of command counts, m_CmdUsage, and the total command usage, m_nTotalUsage, counter from or to the specified archive.

For serialization examples, see Serialization: Serializing an Object.

CMFCCmdUsageCount::SetOptions

Sets the values of shared CMFCCmdUsageCount class data members.

static BOOL __stdcall SetOptions(
    UINT nStartCount,
    UINT nMinUsagePercentage);

Parameters

nStartCount
[in] The new initial count of all tracked commands.

nMinUsagePercentage
[in] The new minimum usage percentage.

Return Value

TRUE if the method succeeds, FALSE if the nMinUsagePercentage parameter is larger than or equal to 100.

Remarks

This method sets the shared CMFCCmdUsageCount class data members m_nStartCount and m_nMinUsagePercentage to nStartCount and nMinUsagePercentage, respectively. m_nStartCount is used by the CMFCCmdUsageCount::HasEnoughInformation method to determine whether this object has collected the minimum amount of tracking data. m_nMinUsagePercentage is used by the CMFCCmdUsageCount::IsFreqeuntlyUsedCmd method to determine whether a given command is frequently used.

In Debug builds this method generates an assertion failure if the nMinUsagePercentage parameter is larger than or equal to 100.

See also

Hierarchy Chart
Classes
CMFCToolBar Class