[ VC(Visual C++) ]-DLL系列(03_抓抓圖) – jashliao部落格

主要程式碼:

// DC2DC.cpp : Defines the initialization routines for the DLL.

//

#include "stdafx.h"

#include "DC2DC.h"

#include "DibSection.h"

#include 

#ifdef _DEBUG

#definenew DEBUG_NEW

#undef THIS_FILE

staticchar THIS_FILE[] = __FILE__;

#endif

int n;

char str1[10];

//

//    Note!

//

//        If this DLL is dynamically linked against the MFC

//        DLLs, any functions exported from this DLL which

//        call into MFC must have the AFX_MANAGE_STATE macro

//        added at the very beginning of the function.

//

//        For example:

//

//        extern "C" BOOL PASCAL EXPORT ExportedFunction()

//        {

//            AFX_MANAGE_STATE(AfxGetStaticModuleState());

//            // normal function body here

//        }

//

//        It is very important that this macro appear in each

//        function, prior to any calls into MFC.  This means that

//        it must appear as the first statement within the 

//        function, even before any object variable declarations

//        as their constructors may generate calls into the MFC

//        DLL.

//

//        Please see MFC Technical Notes 33 and 58 for additional

//        details.

//

/////////////////////////////////////////////////////////////////////////////

// CDC2DCApp

BEGIN_MESSAGE_MAP(CDC2DCApp, CWinApp)

    //{{AFX_MSG_MAP(CDC2DCApp)

        // NOTE - the ClassWizard will add and remove mapping macros here.

        //    DO NOT EDIT what you see in these blocks of generated code!

    //}}AFX_MSG_MAP

END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////

// CDC2DCApp construction

CDC2DCApp::CDC2DCApp()

{

    // TODO: add construction code here,

    // Place all significant initialization in InitInstance

    n=0;

}

/////////////////////////////////////////////////////////////////////////////

// The one and only CDC2DCApp object

void EXPORTED_DLL_FUNCTION DC2DC (long GetHDC,long w,long h)

{

    long Width,Height;

    long x,y;

    long R,G,B;

    CString  str2;

    itoa(n,str1,10);

    n++;

    str2=str1;

    str2=str2+".bmp";

    CDibSection testDib;

    CDibSection testDib1;

    testDib.Create(w,h,24);

    Width=testDib.Width();

    Height=testDib.Height();

    testDib1.Create(Width,Height,24);

    BitBlt(CDibDC(testDib),0,0,w/1,h/1,(HDC)GetHDC,0,0,SRCCOPY);

    for(x=0;x

    {

        for(y=0;y

        {

            BYTE *q1=(BYTE *)testDib.GetBits(x,y);//利用物件本身所提供之成員函數取得一個像素的 R,G,B(指標用法)

            BYTE *q=(BYTE *)testDib1.GetBits(x,y);//利用物件本身所提供之成員函數取得一個像素的 R,G,B(指標用法)

            B=*q1++;

            G=*q1++;

            R=*q1++;

            *q++=(0.299*R+0.587*G+0.114*B);

            *q++=(0.299*R+0.587*G+0.114*B);

            *q++=(0.299*R+0.587*G+0.114*B);

        }

    }

    testDib1.SaveBmp("test1.bmp");

    testDib.SaveBmp(str2.GetBuffer(0));

}

CDC2DCApp theApp;