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Special Command—Using !chksym/!itoldyouso to Check PDB Files Against Modules

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These are two debugger extensions that are used to see the PDB file that matches a specific module.

Note that !itoldyouso is not documented. The output of both commands is identical.

Usage:

0:025> !chksym ntdll

ntdll.dll

    Timestamp: 49EEA706

  SizeOfImage: 180000

          pdb: wntdll.pdb

      pdb sig: E06BEA15-5E97-48BE-A818-E2D0DD2FED95

          age: 2

Loaded pdb is c:\publicsymbols\wntdll.pdb\E06BEA155E9748BEA818E2D0DD2FED952\wntdll.pdb

wntdll.pdb

      pdb sig: E06BEA15-5E97-48BE-A818-E2D0DD2FED95

          age: 2

MATCH: wntdll.pdb and ntdll.dll

0:025> !itoldyouso ntdll

ntdll.dll

    Timestamp: 49EEA706

  SizeOfImage: 180000

          pdb: wntdll.pdb

      pdb sig: E06BEA15-5E97-48BE-A818-E2D0DD2FED95

          age: 2

Loaded pdb is c:\publicsymbols\wntdll.pdb\E06BEA155E9748BEA818E2D0DD2FED952\wntdll.pdb

wntdll.pdb

      pdb sig: E06BEA15-5E97-48BE-A818-E2D0DD2FED95

          age: 2

MATCH: wntdll.pdb and ntdll.dll

0:025> !chksym mtgdi

mtgdi.exe

    Timestamp: 48785A80

  SizeOfImage: 27000

          pdb: c:\DOWNLOADS\mtgdi\Debug\mtgdi.pdb

      pdb sig: EC1B3DB2-25C1-4337-8676-DFB3C5B1C8C9

          age: 3

Loaded pdb is C:\development\My Tools\Book\mtgdi\Debug\mtgdi.pdb

mtgdi.pdb

      pdb sig: EC1B3DB2-25C1-4337-8676-DFB3C5B1C8C9

          age: 3

MATCH: mtgdi.pdb and mtgdi.exe

0:025> !itoldyouso mtgdi

mtgdi.exe

    Timestamp: 48785A80

  SizeOfImage: 27000

          pdb: c:\DOWNLOADS\mtgdi\Debug\mtgdi.pdb

      pdb sig: EC1B3DB2-25C1-4337-8676-DFB3C5B1C8C9

          age: 3

Loaded pdb is C:\development\My Tools\Book\mtgdi\Debug\mtgdi.pdb

mtgdi.pdb

      pdb sig: EC1B3DB2-25C1-4337-8676-DFB3C5B1C8C9

          age: 3

MATCH: mtgdi.pdb and mtgdi.exe