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C6216

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This article applies to Visual Studio 2015. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here

warning C6216: compiler-inserted cast between semantically different integral types: a Boolean type to HRESULT

This warning indicates that a Boolean is being used as an HRESULT without being explicitly cast. Boolean types indicate success by a non-zero value; success (S_OK) in HRESULT is indicated by a value of 0. The typical failure value for functions that return a Boolean false is a success status when it is tested as an HRESULT. This is likely to lead to incorrect results.

Example

The following code generates this warning:

#include <windows.h>  
BOOL IsEqual(REFGUID, REFGUID);  
  
HRESULT f( REFGUID riid1, REFGUID riid2 )  
{  
  // code ...  
  return IsEqual(riid1, riid2);    
}

To correct this warning, use the following code:

#include <windows.h>  
BOOL IsEqual(REFGUID, REFGUID);  
  
HRESULT f( REFGUID riid1, REFGUID riid2 )  
{  
  if (IsEqual(riid1, riid2) == TRUE)  
  {  
    // code ...  
    return S_OK;  
  }  
  else  
  {  
    // code ...  
    return E_FAIL;  
  }  
}

For this warning, the SCODE type is equivalent to HRESULT.

For more information, see SUCCEEDED Macro and FAILED Macro.