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制作透明窗体

 2008-03-08 21:54:12 来源:WEB开发网   
核心提示:1.重载CreateParams函数,设置透明风格2.然后重载它的WM_ERASEBKGND消息,制作透明窗体,代码片段:.h Fileclass TYourForm:public TForm{PRivate:void __fastcall WMNC(TMessage &Message);public:__fastca

  1.重载CreateParams函数,设置透明风格
2.然后重载它的WM_ERASEBKGND消息。
代码片段:

.h File
class TYourForm:public TForm
{
PRivate:
    void __fastcall WMNC(TMessage &Message);
public:
    __fastcall TYourForm(TComponent *Owner);
    BEGIN_MESSAGE_MAP
     VCL_MESSAGE_HANDLER(WM_ERASEBKGND,TMessage,WMNC);
    END_MESSAGE_MAP(TForm);
protected:
    virtual void __fastcall CreateParams(TCreateParams &Params);
}


.cpp File

void __fastcall TYourForm::CreateParams(TCreateParams &Params)
{
 TForm::CreateParams(Params);
 Params.EX_STYLE=WS_EX_TRANSPARENT;
}
void __fastcall TYourForm::WMNC(TMessage &Message)
{
 SetBkMode(GetWindowDC(this->Handle),OPAQUE);
 ReleaseDC(this->Handle,GetWindowDC(this->Handle)) ;
 Messgae.Result=1;
}

Tags:制作 透明 窗体

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