GDI+-创新互联

1,

编译error的话一般是却

#include
#include

Windows.h内会包含Windows.h，但是因为在stdafx.h中会智能创建WIN32_LEAN_AND_MEAN宏，会屏蔽comdef.h，这样就会导致声明缺失问题。

删除WIN32_LEAN_AND_MEAN宏或者手动添加包含comdef.h头文件就可以了。

2，

#include 
#include

#include"GDIPlusB.h"
#include 
using namespace Gdiplus; 
#pragma comment(lib,"gdiplus.lib")

void CGDIPlusB::InitInstance()
{
　　//GDI+的初始化
    Gdiplus::GdiplusStartupInput gdiplusStartupInput; 
    Gdiplus::GdiplusStartup(&m_gdiplusToken , &gdiplusStartupInput, NULL); 
}
void CGDIPlusB::UnInstance()
{
　　//关闭GDI+
    Gdiplus::GdiplusShutdown(m_gdiplusToken);
}

3，

void CGDIPlusB::DrawAlphaPen( HDC* phdc  ) 
{
    COLORREF    crBackClr= RGB( 0,0,255);
    COLORREF    crDark= RGB( 0 , 255 , 0 );
    COLORREF    crBright= RGB( 255,255,255);   
    Color   GdiClrD,GdiClrB;//用于产生渐变效果;    GdiClrD.SetFromCOLORREF(crDark);   
    GdiClrB.SetFromCOLORREF(crBright);   

int   r,g,b,r1,g1,b1;//分别得到明色和暗色的R   G   B值    r   =   GdiClrD.GetRed();   
    g=   GdiClrD.GetGreen();   
    b=   GdiClrD.GetBlue();   

    r1=   GdiClrB.GetRed();   
    g1=   GdiClrB.GetGreen();   
    b1=   GdiClrB.GetBlue();   

int   alpha   =220 ;

//产生渐变的透明画刷    Color   GdiClrDark(alpha,r,g,b) ;   
    Color   GdiClrBright(alpha,r1,g1,b1) ;   

    Gdiplus::Point pt_begin , pt_end ;
    SetRect(&m_rc , 200 ,200 , 200+260 , 200+149 ) ;
    pt_begin.X= m_rc.left ;
    pt_begin.Y= m_rc.top ;

    pt_end.X= m_rc.right ;
    pt_end.Y= m_rc.bottom ;

    LinearGradientBrush linGrBrush( pt_begin , pt_end , GdiClrDark,GdiClrBright );
    Pen   pen0(&linGrBrush,16 );   

    Graphics graphics(*phdc );
    graphics.DrawLine(&pen0 , pt_begin , pt_end ) ;
    graphics.ReleaseHDC(*phdc ) ;

}
void CGDIPlusB::DrawImage( HDC* phdc  ) 
{
    TCHAR img[MAX_PATH];
    _stprintf( img,_T("E:\liuhanGit\liuhan_memUI\memUI\memUI_SKIN\p6.png")) ;
    Image image( img ); 
    Graphics graphics(*phdc );
    graphics.DrawImage(&image, 200,400 );
    graphics.ReleaseHDC(*phdc ) ;

}
void CGDIPlusB::DrawGradientBrush( HDC* phdc ) 
{
    COLORREF    crBackClr= RGB( 0,0,255);
    COLORREF    crDark= RGB( 0 , 255 , 0 );
    COLORREF    crBright= RGB( 255,255,255);   
    Color   GdiClrD,GdiClrB;//用于产生渐变效果;    GdiClrD.SetFromCOLORREF(crDark);   
    GdiClrB.SetFromCOLORREF(crBright);   

int   r,g,b,r1,g1,b1;//分别得到明色和暗色的R   G   B值    r   =   GdiClrD.GetRed();   
    g=   GdiClrD.GetGreen();   
    b=   GdiClrD.GetBlue();   

    r1=   GdiClrB.GetRed();   
    g1=   GdiClrB.GetGreen();   
    b1=   GdiClrB.GetBlue();   

int   alpha   =220 ;

//产生渐变的透明画刷    Color   GdiClrDark(alpha,r,g,b) ;   
    Color   GdiClrBright(alpha,r1,g1,b1) ;   

    Gdiplus::Point pt_begin , pt_end ;
    SetRect(&m_rc , 500 ,200 , 500+260 , 200+149 ) ;
    pt_begin.X= m_rc.left ;
    pt_begin.Y= m_rc.top ;

    pt_end.X= m_rc.right ;
    pt_end.Y= m_rc.bottom ;

    Brush* bsh0 = new LinearGradientBrush(  pt_begin , pt_end , GdiClrDark,GdiClrBright  )  ;
    Graphics graphics(*phdc );
    graphics.FillRectangle( bsh0 , m_rc.left , m_rc.top  , m_rc.right- m_rc.left ,  m_rc.bottom - m_rc.top ) ; 
    delete bsh0 ;
    graphics.ReleaseHDC(*phdc ) ;
}

void CGDIPlusB::DrawGradientBrush2( HDC* phdc ) 
{
    Gdiplus::Point pt_begin , pt_end ;
    SetRect(&m_rc , 500 ,400 , 500+260 , 400+149 ) ;
    pt_begin.X= m_rc.left ;
    pt_begin.Y= m_rc.top ;

    pt_end.X= m_rc.right ;
    pt_end.Y= m_rc.bottom ;

    LinearGradientBrush linGrBrush( pt_begin , pt_end  ,Color(255,255,0,0),Color(255,0,0,255));  
     Color colors[]= {  
         Color(255, 255, 0, 0), // red         Color(255, 255, 255, 0), //yellow         Color(255, 0, 0, 255), // blue         Color(255, 0, 255, 0)};// green         REAL positions[] = {  
0.0f,     
0.33f,     
0.66f,  
1.0f};    
    linGrBrush.SetInterpolationColors(colors, positions,4);  

    Graphics graphics(*phdc );
    graphics.FillRectangle(&linGrBrush , m_rc.left , m_rc.top  , m_rc.right - m_rc.left ,  m_rc.bottom - m_rc.top ) ; 
    graphics.ReleaseHDC(*phdc ) ;
}