本文根据 CandyCat 收藏的 《编程实现窗体的半透明效果(作者:罗蔷)》一文修改而成,供BCB+Win2000使用。将控件安装即可使用 btw:分类里面,没有BCB,只好贴到delphi里面////////////////////////////////////////////////////////////////////////////////////////////////头文件://---------------------------------------------------------------------------#ifndef TransparentFormH
#define TransparentFormH
//---------------------------------------------------------------------------
#include <SysUtils.hpp>
#include <Controls.hpp>
#include <Classes.hpp>
#include <Forms.hpp>
//---------------------------------------------------------------------------
class PACKAGE TTransparentForm : public TComponent
{
private:
protected:
int m_nAlphaValue;
HWND m_hParentFormHandle;
void __fastcall SetAlphaValue(int nAlpha);
void __fastcall UpdateDisplay();
public:
__fastcall TTransparentForm(TComponent* Owner);
__published:
__property int AlphaValue = {read = m_nAlphaValue, write = SetAlphaValue, default = 0};
};
//---------------------------------------------------------------------------
#endif
////////////////////////////////////////////////////////////////////////////////////////////////cpp文件: //---------------------------------------------------------------------------#include <vcl.h>
#pragma hdrstop#include "TransparentForm.h"
#pragma package(smart_init)
//---------------------------------------------------------------------------
// ValidCtrCheck is used to assure that the components created do not have
// any pure virtual functions.
//
static inline void ValidCtrCheck(TTransparentForm *)
{
new TTransparentForm(NULL);
}
//---------------------------------------------------------------------------
__fastcall TTransparentForm::TTransparentForm(TComponent* Owner)
: TComponent(Owner)
{
if (ComponentState.Contains(csDesigning))
return;
m_nAlphaValue = 255 ;
m_hParentFormHandle = ((TForm *)(Owner))->Handle ;
SetWindowLong(m_hParentFormHandle, GWL_EXSTYLE, GetWindowLong(m_hParentFormHandle, GWL_EXSTYLE) | WS_EX_LAYERED);
}
//---------------------------------------------------------------------------
namespace Transparentform
{
void __fastcall PACKAGE Register()
{
TComponentClass classes[1] = {__classid(TTransparentForm)};
RegisterComponents("Easysoft", classes, 0);
}
}
//---------------------------------------------------------------------------
void __fastcall TTransparentForm::SetAlphaValue(int nAlpha)
{
if (nAlpha >= 0 && nAlpha < 256)
{
m_nAlphaValue = nAlpha;
UpdateDisplay();
}
}void __fastcall TTransparentForm::UpdateDisplay()
{
if (ComponentState.Contains(csDesigning))
return;
SetLayeredWindowAttributes(m_hParentFormHandle, 0, m_nAlphaValue, 2);
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////[email protected]
//http://www.shijun.com
//5/19/2001
#define TransparentFormH
//---------------------------------------------------------------------------
#include <SysUtils.hpp>
#include <Controls.hpp>
#include <Classes.hpp>
#include <Forms.hpp>
//---------------------------------------------------------------------------
class PACKAGE TTransparentForm : public TComponent
{
private:
protected:
int m_nAlphaValue;
HWND m_hParentFormHandle;
void __fastcall SetAlphaValue(int nAlpha);
void __fastcall UpdateDisplay();
public:
__fastcall TTransparentForm(TComponent* Owner);
__published:
__property int AlphaValue = {read = m_nAlphaValue, write = SetAlphaValue, default = 0};
};
//---------------------------------------------------------------------------
#endif
////////////////////////////////////////////////////////////////////////////////////////////////cpp文件: //---------------------------------------------------------------------------#include <vcl.h>
#pragma hdrstop#include "TransparentForm.h"
#pragma package(smart_init)
//---------------------------------------------------------------------------
// ValidCtrCheck is used to assure that the components created do not have
// any pure virtual functions.
//
static inline void ValidCtrCheck(TTransparentForm *)
{
new TTransparentForm(NULL);
}
//---------------------------------------------------------------------------
__fastcall TTransparentForm::TTransparentForm(TComponent* Owner)
: TComponent(Owner)
{
if (ComponentState.Contains(csDesigning))
return;
m_nAlphaValue = 255 ;
m_hParentFormHandle = ((TForm *)(Owner))->Handle ;
SetWindowLong(m_hParentFormHandle, GWL_EXSTYLE, GetWindowLong(m_hParentFormHandle, GWL_EXSTYLE) | WS_EX_LAYERED);
}
//---------------------------------------------------------------------------
namespace Transparentform
{
void __fastcall PACKAGE Register()
{
TComponentClass classes[1] = {__classid(TTransparentForm)};
RegisterComponents("Easysoft", classes, 0);
}
}
//---------------------------------------------------------------------------
void __fastcall TTransparentForm::SetAlphaValue(int nAlpha)
{
if (nAlpha >= 0 && nAlpha < 256)
{
m_nAlphaValue = nAlpha;
UpdateDisplay();
}
}void __fastcall TTransparentForm::UpdateDisplay()
{
if (ComponentState.Contains(csDesigning))
return;
SetLayeredWindowAttributes(m_hParentFormHandle, 0, m_nAlphaValue, 2);
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////[email protected]
//http://www.shijun.com
//5/19/2001
SysUtils,Controls,Classes,Forms;
TTransparentForm = class(TComponent)
private
protected
m_nAlphaValue : Integer;
m_hParentFormHandle : HWND;
procedure SetAlphaValue(nAlpha : Integer);
procedure UpdateDisplay;
public
procedure TTransparentForm(Owner : TComponent);
constructor Create(AOwner: TComponent); override;
published
property AlphaValue : Integer read m_nAlphaValue write SetAlphaValue;
end;procedure Register;implementationprocedure Register;
begin
RegisterComponents('Easysoft',[TTransparentForm]);
end;static inline void ValidCtrCheck(TTransparentForm *)
{
new TTransparentForm(NULL);
}
//---------------------------------------------------------------------------
constructor TTransparentForm.Create(AOwner: TComponent);
begin
if (ComponentState in csDesigning) then Exit;
m_nAlphaValue := 255;
m_hParentFormHandle := TForm(AOwner).Handle;
SetWindowLong(m_hParentFormHandle, GWL_EXSTYLE, GetWindowLong(m_hParentFormHandle, GWL_EXSTYLE) OR WS_EX_LAYERED);
end;procedure TTransparentForm.SetAlphaValue(int nAlpha);
begin
if (nAlpha >= 0) and (nAlpha < 256) then
begin
m_nAlphaValue := nAlpha;
UpdateDisplay;
end;
end;procedure TTransparentForm.UpdateDisplay;
begin
if not (ComponentState in csDesigning) then
SetLayeredWindowAttributes(m_hParentFormHandle, 0, m_nAlphaValue, 2);
end;end.
2000下:
SetWindowLong(Handle, GWL_EXSTYLE, GetWindowLong(m_hParentFormHandle, GWL_EXSTYLE) OR WS_EX_LAYERED);
SetLayeredWindowAttributes(Handle, 0, 180, 2); //180是透明程度,从0-255 最后一个参数还是用常量吧 好象是LWA_ALPHA