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‎docs/debugger/debug-interface-access/idiaenumlinenumbers.md

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title: "IDiaEnumLineNumbers | Microsoft Docs"
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ms.date: "11/04/2016"
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ms.topic: "conceptual"
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dev_langs:
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dev_langs:
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- "C++"
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helpviewer_keywords:
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helpviewer_keywords:
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- "IDiaEnumLineNumbers interface"
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ms.assetid: cdf07b4f-19e4-4dcd-8af8-c2dbca586a7c
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author: "mikejo5000"
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ms.author: "mikejo"
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manager: jillfra
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ms.workload:
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ms.workload:
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- "multiple"
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---
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# IDiaEnumLineNumbers
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Enumerates the various line numbers contained in the data source.
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## Syntax
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```
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IDiaEnumLineNumbers : IUnknown
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```
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## Methods in Vtable Order
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The following table shows the methods of `IDiaEnumLineNumbers`.
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|Method|Description|
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|------------|-----------------|
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|[IDiaEnumLineNumbers::get__NewEnum](../../debugger/debug-interface-access/idiaenumlinenumbers-get-newenum.md)|Retrieves the [IEnumVARIANT Interface](/previous-versions/windows/desktop/api/oaidl/nn-oaidl-ienumvariant) version of this enumerator.|
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|[IDiaEnumLineNumbers::get_Count](../../debugger/debug-interface-access/idiaenumlinenumbers-get-count.md)|Retrieves the number of line numbers.|
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|[IDiaEnumLineNumbers::Item](../../debugger/debug-interface-access/idiaenumlinenumbers-item.md)|Retrieves a line number by means of an index.|
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|[IDiaEnumLineNumbers::Next](../../debugger/debug-interface-access/idiaenumlinenumbers-next.md)|Retrieves a specified number of line numbers in the enumeration sequence.|
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|[IDiaEnumLineNumbers::Skip](../../debugger/debug-interface-access/idiaenumlinenumbers-skip.md)|Skips a specified number of line numbers in an enumeration sequence.|
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|[IDiaEnumLineNumbers::Reset](../../debugger/debug-interface-access/idiaenumlinenumbers-reset.md)|Resets an enumeration sequence to the beginning.|
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|[IDiaEnumLineNumbers::Clone](../../debugger/debug-interface-access/idiaenumlinenumbers-clone.md)|Creates an enumerator that contains the same enumeration state as the current enumerator.|
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## Remarks
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## Notes for Callers
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This interface is obtained by calling one of the following methods in the [IDiaSession](../../debugger/debug-interface-access/idiasession.md) interface:
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- [IDiaSession::findLines](../../debugger/debug-interface-access/idiasession-findlines.md)
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- [IDiaSession::findLinesByAddr](../../debugger/debug-interface-access/idiasession-findlinesbyaddr.md)
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- [IDiaSession::findLinesByRVA](../../debugger/debug-interface-access/idiasession-findlinesbyrva.md)
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- [IDiaSession::findLinesByVA](../../debugger/debug-interface-access/idiasession-findlinesbyva.md)
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- [IDiaSession::findLinesByLinenum](../../debugger/debug-interface-access/idiasession-findlinesbylinenum.md)
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## Example
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This example shows how to obtain the `IDiaEnumLineNumbers` interface from a session. In this case, the example shows how to get the line number enumeration for a function (represented by `pSymbol`). For a more complete example of using line numbers, see the [IDiaLineNumber](../../debugger/debug-interface-access/idialinenumber.md) interface.
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```C++
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void dumpFunctionLines( IDiaSymbol* pSymbol, IDiaSession* pSession )
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{
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ULONGLONG length = 0;
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DWORD isect = 0;
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DWORD offset = 0;
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pSymbol->get_addressSection( &isect );
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pSymbol->get_addressOffset( &offset );
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pSymbol->get_length( &length );
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if ( isect != 0 && length > 0 )
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{
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CComPtr< IDiaEnumLineNumbers > pLines;
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if ( SUCCEEDED( pSession->findLinesByAddr(
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isect,
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offset,
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static_cast<DWORD>( length ),
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&pLines )
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)
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)
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{
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// Do something with the enumeration
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}
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}
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}
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```
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## Requirements
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Header: Dia2.h
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Library: diaguids.lib
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DLL: msdia80.dll
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## See Also
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[Interfaces (Debug Interface Access SDK)](../../debugger/debug-interface-access/interfaces-debug-interface-access-sdk.md)
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[IDiaSession](../../debugger/debug-interface-access/idiasession.md)
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[IDiaSession::findLinesByLinenum](../../debugger/debug-interface-access/idiasession-findlinesbylinenum.md)
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[IDiaSession::findLinesByRVA](../../debugger/debug-interface-access/idiasession-findlinesbyrva.md)
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[IDiaSession::findLinesByVA](../../debugger/debug-interface-access/idiasession-findlinesbyva.md)
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[IDiaSession::findLines](../../debugger/debug-interface-access/idiasession-findlines.md)
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[IDiaSession::findLinesByAddr](../../debugger/debug-interface-access/idiasession-findlinesbyaddr.md)
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Enumerates the various line numbers contained in the data source.
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## Syntax
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```
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IDiaEnumLineNumbers : IUnknown
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```
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## Methods in Vtable Order
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The following table shows the methods of `IDiaEnumLineNumbers`.
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|Method|Description|
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|------------|-----------------|
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|[IDiaEnumLineNumbers::get__NewEnum](../../debugger/debug-interface-access/idiaenumlinenumbers-get-newenum.md)|Retrieves the [IEnumVARIANT Interface](/previous-versions/windows/desktop/api/oaidl/nn-oaidl-ienumvariant) version of this enumerator.|
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|[IDiaEnumLineNumbers::get_Count](../../debugger/debug-interface-access/idiaenumlinenumbers-get-count.md)|Retrieves the number of line numbers.|
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|[IDiaEnumLineNumbers::Item](../../debugger/debug-interface-access/idiaenumlinenumbers-item.md)|Retrieves a line number by means of an index.|
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|[IDiaEnumLineNumbers::Next](../../debugger/debug-interface-access/idiaenumlinenumbers-next.md)|Retrieves a specified number of line numbers in the enumeration sequence.|
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|[IDiaEnumLineNumbers::Skip](../../debugger/debug-interface-access/idiaenumlinenumbers-skip.md)|Skips a specified number of line numbers in an enumeration sequence.|
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|[IDiaEnumLineNumbers::Reset](../../debugger/debug-interface-access/idiaenumlinenumbers-reset.md)|Resets an enumeration sequence to the beginning.|
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|[IDiaEnumLineNumbers::Clone](../../debugger/debug-interface-access/idiaenumlinenumbers-clone.md)|Creates an enumerator that contains the same enumeration state as the current enumerator.|
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## Remarks
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## Notes for Callers
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This interface is obtained by calling one of the following methods in the [IDiaSession](../../debugger/debug-interface-access/idiasession.md) interface:
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- [IDiaSession::findLines](../../debugger/debug-interface-access/idiasession-findlines.md)
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- [IDiaSession::findLinesByAddr](../../debugger/debug-interface-access/idiasession-findlinesbyaddr.md)
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- [IDiaSession::findLinesByRVA](../../debugger/debug-interface-access/idiasession-findlinesbyrva.md)
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- [IDiaSession::findLinesByVA](../../debugger/debug-interface-access/idiasession-findlinesbyva.md)
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- [IDiaSession::findLinesByLinenum](../../debugger/debug-interface-access/idiasession-findlinesbylinenum.md)
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## Example
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This example shows how to obtain the `IDiaEnumLineNumbers` interface from a session. In this case, the example shows how to get the line number enumeration for a function (represented by `pSymbol`). For a more complete example of using line numbers, see the [IDiaLineNumber](../../debugger/debug-interface-access/idialinenumber.md) interface.
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```C++
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void dumpFunctionLines( IDiaSymbol* pSymbol, IDiaSession* pSession )
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{
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ULONGLONG length = 0;
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DWORD isect = 0;
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DWORD offset = 0;
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pSymbol->get_addressSection( &isect );
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pSymbol->get_addressOffset( &offset );
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pSymbol->get_length( &length );
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if ( isect != 0 && length > 0 )
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{
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CComPtr< IDiaEnumLineNumbers > pLines;
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if ( SUCCEEDED( pSession->findLinesByAddr(
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isect,
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offset,
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static_cast<DWORD>( length ),
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&pLines )
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)
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)
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{
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// Do something with the enumeration
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}
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}
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}
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```
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## Requirements
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Header: Dia2.h
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Library: diaguids.lib
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DLL: msdia80.dll
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## See Also
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[Interfaces (Debug Interface Access SDK)](../../debugger/debug-interface-access/interfaces-debug-interface-access-sdk.md)
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[IDiaSession](../../debugger/debug-interface-access/idiasession.md)
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[IDiaSession::findLinesByLinenum](../../debugger/debug-interface-access/idiasession-findlinesbylinenum.md)
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[IDiaSession::findLinesByRVA](../../debugger/debug-interface-access/idiasession-findlinesbyrva.md)
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[IDiaSession::findLinesByVA](../../debugger/debug-interface-access/idiasession-findlinesbyva.md)
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[IDiaSession::findLines](../../debugger/debug-interface-access/idiasession-findlines.md)
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[IDiaSession::findLinesByAddr](../../debugger/debug-interface-access/idiasession-findlinesbyaddr.md)

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