ERROR_INVALID_MSGBOX_STYLE - 1438 (0x59E)
Invalid message box style.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_INVALID_MSGBOX_STYLE error code indicates that an invalid style was specified for a message box function in the Windows API. This error is typically encountered when using functions such as MessageBox, MessageBoxA, or similar.
Error Details
This error occurs when one of the following conditions is met:
- An unsupported or incorrect combination of message box styles is passed to the function.
- A style that does not apply to a particular message box type is specified.
Usage Context
The ERROR_INVALID_MSGBOX_STYLE error can be returned by various Windows API functions, such as MessageBox, which are used for displaying dialog boxes with messages and buttons. The specific context in which this error occurs depends on the function call that triggered it.
Developer Interpretation
Developers should ensure that they are using valid message box styles when calling functions like MessageBox. Refer to the documentation of these functions for a list of supported styles and their meanings. Incorrect usage can lead to unexpected behavior or failure of the application.
Related Errors
ERROR_INVALID_PARAMETER(1208, 0x4C8)ERROR_CALL_NOT_IMPLEMENTED(1203, 0x4B7)
FAQ
Q: What does the ERROR_INVALID_MSGBOX_STYLE error mean?
A: It indicates that an invalid style was specified for a message box function.
Q: How can I avoid this error?
A: Ensure that you are using valid styles when calling functions like MessageBox. Consult the documentation for supported styles and their usage.
Summary
The ERROR_INVALID_MSGBOX_STYLE error is a generic return code indicating an invalid message box style. Developers should refer to the API documentation for correct usage of message box functions.