DelphiVCL.Application.MessageBox is used to display a specified message to the user.
Use MessageBox to display a generic dialog box containing a message and one or more buttons. The Caption parameter specifies the caption of the dialog box and is optional.
MessageBox is an encapsulation of the Windows API MessageBox function, which is described at http://msdn.microsoft.com/en-us/library/windows/desktop/ms645505(v=vs.85).aspx.
Let’s browse all the properties, methods, and built-in properties of the DelphiVCL.Application.MessageBox using dir() command:
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import DelphiVCL dir(DelphiVCL.Application.MessageBox) |
See the responses in our Windows command prompt:
The Application encapsulation of MessageBox automatically supplies the missing window handle parameter needed for the Windows API function.
The value of the Text parameter is the message, which can be longer than 255 characters if necessary. Long messages are automatically wrapped in the message box.
The value of the Caption parameter is the caption that appears in the title bar of the dialog box. Captions can be longer than 255 characters, but do not wrap. A long caption results in a wide message box.
The Flags parameter specifies what buttons appear on the message box and the behavior (possible return values). The following table lists the possible values. These values can be combined to obtain the desired effect:
| Value | Meaning |
| MB_ABORTRETRYIGNORE | The message box contains three push buttons: Abort, Retry, and Ignore. |
| MB_OK | The message box contains one push button: OK. This is the default. |
| MB_OKCANCEL | The message box contains two push buttons: OK and Cancel. |
| MB_RETRYCANCEL | The message box contains two push buttons: Retry and Cancel. |
| MB_YESNO | The message box contains two push buttons: Yes and No. |
| MB_YESNOCANCEL | The message box contains three push buttons: Yes, No, and Cancel. |
MessageBox returns 0 if there is not enough memory to create the message box. Otherwise it returns one of the following values:
| Value | Numeric Value | Meaning |
| IDOK | 1 | The user chose the OK button. |
| IDCANCEL | 2 | The user chose the Cancel button. |
| IDABORT | 3 | The user chose the Abort button. |
| IDRETRY | 4 | The user chose the Retry button. |
| IDIGNORE | 5 | The user chose the Ignore button. |
| IDYES | 6 | The user chose the Yes button. |
| IDNO | 7 | The user chose the No button. |
You can find all the possible values above, using the dir() command:
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import DelphiVCL dir(DelphiVCL) |
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