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C/C++ API Documentation | 2026.1

# ClientApi::DefineIgnoreFile( const char *, Error * )

Sets `P4IGNORE` in the Windows registry and applies the setting immediately.

Virtual? | No |
Class | `ClientApi` |
Arguments | `const char *c` | the new `P4IGNORE` setting
| `Error *e` | an `Error` object
Returns | `void` |

## Notes

To make the new `P4IGNORE` setting apply to the next command executed with `Run()`, `DefineIgnoreFile()` sets the value in the registry and then calls `SetIgnoreFile()`.

## See also

- `ClientApi::GetIgnore()`

- `ClientApi::GetIgnoreFile()`

- `ClientApi::SetIgnoreFile()`

## Example

The following code illustrates how this method might be used to make a Windows client application start up with a default `P4IGNORE` setting.

Copy

    # include "clientapi.h"

    int main()
    {
        ClientApi client;
        Error e;

        client.Init( &e );
        client.DefineIgnoreFile( ".p4ignore", &e );
    }

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