Winapi.Messages.TMessage

• Up to Parent: Winapi.Messages
• Fields

Delphi

  TMessage = record
    Msg: Cardinal;
    case Integer of
      0: (
        WParam: WPARAM;
        LParam: LPARAM;
        Result: LRESULT);
      1: (
        WParamLo: Word;
        WParamHi: Word;
        WParamFiller: TDWordFiller;
        LParamLo: Word;
        LParamHi: Word;
        LParamFiller: TDWordFiller;
        ResultLo: Word;
        ResultHi: Word;
        ResultFiller: TDWordFiller);
  end;

C++

struct DECLSPEC_DRECORD TMessage{
public:
    unsigned Msg;
    #pragma pack(push,1)
    union
    {
        struct
        {
            System::Word WParamLo;
            System::Word WParamHi;
            System::Word LParamLo;
            System::Word LParamHi;
            System::Word ResultLo;
            System::Word ResultHi;
        };
        struct
        {
            NativeUInt WParam;
            NativeInt LParam;
            NativeInt Result;
        };
    };
    #pragma pack(pop)
};

Properties

Type	Visibility	Source	Unit	Parent
record struct	public	Winapi.Messages.pas Winapi.Messages.hpp	Winapi.Messages	Winapi.Messages

Description

TMessage represents a Windows message.

The TMessage type represents a Windows message in WndProc and other methods.

The TMessage contains the following fields:

Field	Meaning
Msg	Represents the Windows Message code.
WParam WParamLo WParamHi	Represents the WParam of the message. To access the low and high words of this field, use the WParamLo and WParamHi fields instead.
LParam LParamLo LParamHi	Represents the LParam of the message. To access the low and high words of this field, use the LParamLo and LParamHi fields instead.
Result ResultLo ResultHi	Holds the return value. To access the low and high words of this field, use the ResultLo and ResultHi fields instead.
WParamFiller LParamFiller ResultFiller	Auxiliary fields used only under 64-bit platforms. These fields are used for padding not occupied high-order bytes in WParam, LParam, and Result fields to align them on 64-bit boundaries native to 64-bit architecture.

See Also

• Winapi.Messages.TDWordFiller
• Winapi.Messages.TWMKey
• Winapi.Messages.TWMMouse
• Winapi.Messages.TWMPaint
• Winapi.Messages.TWMMenuChar
• Winapi.Messages.TWMNotify
• Winapi.Messages.TWMLButtonDown

Code Examples

• ClientWndProc (Delphi)
• ClientWndProc (C++)