GDI+

1,

编译error的话一般是却

#include <comdef.h>
#include <Windows.h>

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 <comdef.h>
#include <Windows.h>

#include "GDIPlusB.h"
#include <gdiplus.h>
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( ,,);
    COLORREF    crDark = RGB(  ,  ,  );
    COLORREF    crBright = RGB( ,,);
    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   =   ;

    //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 ,  , , + , + ) ;
    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, );   

    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, ,   );
    graphics.ReleaseHDC( *phdc ) ;

}
void CGDIPlusB::DrawGradientBrush( HDC* phdc )
{
    COLORREF    crBackClr = RGB( ,,);
    COLORREF    crDark = RGB(  ,  ,  );
    COLORREF    crBright = RGB( ,,);
    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   =   ;

    //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 ,  , , + , + ) ;
    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 ,  , , + , + ) ;
    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(,,,),Color(,,,));
     Color colors[] = {
         Color(, , , ),   // red
         Color(, , , ), //yellow
         Color(, , , ),   // blue
         Color(, , , )};  // green
         REAL positions[] = {
             0.0f,
             0.33f,
             0.66f,
             1.0f};
    linGrBrush.SetInterpolationColors(colors, positions,);  

    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 ) ;
}