社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 4995阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示: "!+gA&  
  Lq|>n Y  
  一、实现方法 `AYq,3V  
:of(wZa3Q  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: Hz\@#   
m/z,MT74*J  
#pragma data_seg("shareddata") w 5 yOSz  
HHOOK hHook =NULL; //钩子句柄 Nv=78O1  
UINT nHookCount =0; //挂接的程序数目 &1(- 8z*  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 CYRZ2Yrk?"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 U0gZf5;*  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 8EI9&L>  
static int KeyCount =0; t0+i ]lr  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 K!]a+M]>  
#pragma data_seg() Q$uv \h;  
Kci. ,I  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 WQ{[q" O  
`78Bv>[A  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: z/u^  
 0:f]&Ng  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR [Ur\^wS  
cKey,UCHAR cMask) Y{D%v  
{ ~w a6S?  
 BOOL bAdded=FALSE; Q F)\\ D[  
 for(int index=0;index<MAX_KEY;index++){ @/F61Ut  
  if(hCallWnd[index]==0){ K>dB{w#gS  
   hCallWnd[index]=hWnd; om`T/@_,  
   HotKey[index]=cKey; D"rbQXR7$  
   HotKeyMask[index]=cMask; #MKM.T,\t  
   bAdded=TRUE; &\1n=y  
   KeyCount++; Jy5sZ }t[  
   break; u<Y#J,p`e  
  }  =*&[K^  
 } l|=4FIMD  
 return bAdded; +LF#XS@  
} w8XCU> |  
//删除热键 In?=$_p  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;I&VpAPx  
{ I]^>>>p$  
 BOOL bRemoved=FALSE; L8 L1_  
 for(int index=0;index<MAX_KEY;index++){ wqhktgG  
  if(hCallWnd[index]==hWnd){ ,Klv[_x7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ q pCI [[  
    hCallWnd[index]=NULL; _]-4d_&3(  
    HotKey[index]=0; C,An\lsT  
    HotKeyMask[index]=0; nq)F$@  
    bRemoved=TRUE; z@yTkH_  
    KeyCount--; [ n7>g   
    break; 7 p{Pmq[  
   } 7 !$[XD  
  } s{-gsSmE  
 } MF8-q'upyT  
 return bRemoved; e"ehH#i  
} =5q<_as  
d=/0A\O  
J0?kEr  
  DLL中的钩子函数如下: |M7cB$y  
qx t0Jr8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >> zd  
{ Y3Fj3NwS  
 BOOL bProcessed=FALSE; |'q%9 #  
 if(HC_ACTION==nCode) 'v"=   
 { |;vQ"8J  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 $@D a|d4  
   switch(wParam) g1s%x=7/  
   {  #;$]M4  
    case VK_MENU: pFvu,Q"  
     MaskBits&=~ALTBIT; X H-_tvB  
     break; HeOdCr-PN  
    case VK_CONTROL: ){*+s RBW  
     MaskBits&=~CTRLBIT; c2y,zq|H  
     break; 5&ku]l+  
    case VK_SHIFT: K]hp-QK<  
     MaskBits&=~SHIFTBIT; $"r9U|6kk  
     break; )th[fUC(  
    default: //judge the key and send message Q?#I{l)V(  
     break; J;C:nE|V  
   } uh )S;3|  
   for(int index=0;index<MAX_KEY;index++){ 1^!SuAA@  
    if(hCallWnd[index]==NULL) w G%W{T$  
     continue; ;V xRaj?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) BmG(+;;&  
    { /|IPBU 5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); vrkY7L3\  
     bProcessed=TRUE; X2z<cJG|d@  
    } U ? +_\  
   } x4oWZEd  
  } 4J2^zx,H  
  else if((lParam&0xc000ffff)==1){ //有键按下 m Qj=-\p  
   switch(wParam) l4OrlS/5  
   { V ~C$|+>e  
    case VK_MENU: ffZ~r%25{  
     MaskBits|=ALTBIT; ;2p+i/sVj  
     break; tAdE<).!  
    case VK_CONTROL: _)M,p@!?=h  
     MaskBits|=CTRLBIT; SIe!=F[  
     break; |eqBCZn  
    case VK_SHIFT: *MP.YI:h  
     MaskBits|=SHIFTBIT; : ?>7Z6  
     break;  c0oHE8@  
    default: //judge the key and send message TSlB.pw%v  
     break; 9a}9cMJ^"  
   } M|WBJ'#x0  
   for(int index=0;index<MAX_KEY;index++){ c0qp-=^&.  
    if(hCallWnd[index]==NULL) fpD$%.y'J  
     continue; ghk=` !yKw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -U d^\Yy  
    { p+VU:%.t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); EB~]6.1  
     bProcessed=TRUE; S+ kq1R  
    } )cqD">vs  
   } F (*B1J2_g  
  } l~c[}wv  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 CMa6':~  
   for(int index=0;index<MAX_KEY;index++){ ~r1pO#r-  
    if(hCallWnd[index]==NULL) 6b2UPI7m~  
     continue; szI7 I$Qb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) M/zO|-j&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); U2q6^z4l  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Xz$4cI#n:  
   }  {>]\<  
  } *'%V}R[>  
 } &Y]':gJ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +y GQt3U  
} d*gAL<M7E  
i5'&u:  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Hiyg1  
XLN bV?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {]0e=#hw  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #z\ub5um  
D|]BFu)F  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: H_+n_r*  
YuXJT*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) T(b9b,ov)  
{ 4&/CES  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) JU 9GJ"  
 { oBzl=N3<  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 *{g3ia  
  SaveBmp(); 3H,E8>Vd  
  return FALSE; wP!X)p\  
 } :|S zD4Ag  
 …… //其它处理及默认处理 A# {63_H  
} 8>Cr6m   
K\Ea\b[  
8y;Rw#Dz  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ]c.w+<  
wQ}r/2n|^  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 _P>YG<*"kQ  
#[93$)Gd!  
  二、编程步骤 IGlR,tw_/  
i5,iJe0cA  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Cf {F"o  
$ghZ<Y2}9  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; }3pM,.  
@<.@ X*#I  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Gw M:f/eV  
(3#PKfY+  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 5KCB^`|b>t  
nxLuzf4U5  
  5、 添加代码,编译运行程序。 !X>u.}?g  
e+ xQ\LH  
三、程序代码 Sj9fq*  
jr6_|(0 i6  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL )vp0X\3q`  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) v+c>iI  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ d2k-MZuT6  
#if _MSC_VER > 1000 %uW  =kr  
#pragma once gP^2GnjHL8  
#endif // _MSC_VER > 1000 Dg&84,bv^  
#ifndef __AFXWIN_H__ jL VJ+mu  
#error include 'stdafx.h' before including this file for PCH 1W^hPY  
#endif y<)TYr  
#include "resource.h" // main symbols vOQ% f?%G\  
class CHookApp : public CWinApp @Nu2 :~JO  
{ 91-bz^=xO  
 public: Up9{aX  
  CHookApp(); Bo 35L:r|  
  // Overrides L@}PW)#  
  // ClassWizard generated virtual function overrides 7)66e  
  //{{AFX_VIRTUAL(CHookApp) 0-2|(9 Kc  
 public: b}e1JPk}!  
  virtual BOOL InitInstance(); jHLs 5%  
  virtual int ExitInstance(); D=tZ}_'{t  
  //}}AFX_VIRTUAL $a(-r-_Fi]  
  //{{AFX_MSG(CHookApp) Zk3Pv0c  
  // NOTE - the ClassWizard will add and remove member functions here. eA!o#O.  
  // DO NOT EDIT what you see in these blocks of generated code ! lqzt[zgN  
  //}}AFX_MSG 60D36b(  
  DECLARE_MESSAGE_MAP() nJD GNm,  
}; Z\&f"z?L  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); sD|l}f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4S_ -9&z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Xn7G2Yp  
BOOL InitHotkey(); C2 N+X(  
BOOL UnInit(); c9(3z0!F ?  
#endif }^"6:;,  
M`MxdwR  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 4{VO:(geZ  
#include "stdafx.h" Z6!Up1  
#include "hook.h" d} >Po%r:  
#include <windowsx.h> NOb`)qb  
#ifdef _DEBUG .)Tj}Im2p  
#define new DEBUG_NEW !avol/*  
#undef THIS_FILE ]#!uke Q  
static char THIS_FILE[] = __FILE__; B(Sy.n  
#endif !_W:%t)g  
#define MAX_KEY 100 8K%N7RL|  
#define CTRLBIT 0x04 @gUp9ZwtH  
#define ALTBIT 0x02 'yo@5*x7  
#define SHIFTBIT 0x01 `Sod]bO +U  
#pragma data_seg("shareddata") `e[S Zj\  
HHOOK hHook =NULL; 6FS%9.Ws  
UINT nHookCount =0; uF ?[H -y  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey K)Y& I  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT [W[{ 4 Xu  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey bS_#3T  
static int KeyCount =0; ~.a"jYb7A}  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ggso9ZlLu+  
#pragma data_seg() WBe0^=x  
HINSTANCE hins; 4GYi'  
void VerifyWindow(); lExQp2E  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) WQ|:TLQ  
//{{AFX_MSG_MAP(CHookApp) J^!;$Hkd  
// NOTE - the ClassWizard will add and remove mapping macros here. |IxHtg3>6{  
// DO NOT EDIT what you see in these blocks of generated code! OL'Ito  
//}}AFX_MSG_MAP P.~UU S  
END_MESSAGE_MAP() | dQ>)_  
kVn RSg}R  
CHookApp::CHookApp() X>(1fra4  
{ ,67Q!/O  
 // TODO: add construction code here, A40DbD\^ad  
 // Place all significant initialization in InitInstance >e]g T  
} o3WOp80hz  
ChBf:`e  
CHookApp theApp; ,H7X_KbFD4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Ee>VA_ss  
{ dQ:,pe7A  
 BOOL bProcessed=FALSE; z]7 WC  
 if(HC_ACTION==nCode) r>mBe;[TX  
 { u6iW1,#  
  if((lParam&0xc0000000)==0xc0000000){// Key up #^FM~5KK  
   switch(wParam) +qi& ?}  
   { \Ne`9k  
    case VK_MENU: VQ=  
     MaskBits&=~ALTBIT; ':4cQ4Z  
     break; ucCf%T\:  
    case VK_CONTROL: ];bRRBEU  
     MaskBits&=~CTRLBIT; "2%z;!U1  
     break; ?0qVyK_1  
    case VK_SHIFT: s 6Wp"V(  
     MaskBits&=~SHIFTBIT; 0TN28:hcD  
     break; Bfb~<rs[  
    default: //judge the key and send message ct+F\:e  
     break; $QbJT`,mr  
   } W'G|sk  
   for(int index=0;index<MAX_KEY;index++){ d_[H|H9i6  
    if(hCallWnd[index]==NULL) 1(' wg!  
     continue; %-hSa~20  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uWS]l[Ga  
    { )Q2Ap&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); t~2oEwTm  
     bProcessed=TRUE; f\&X$g  
    } pyEQb#  
   } >t+ ENYb  
  } &61U1"&$R  
  else if((lParam&0xc000ffff)==1){ //Key down lZzW- %K  
   switch(wParam) )@]%:m!ER  
   { Y;w|Fvjj+  
    case VK_MENU: 44CZl{pt  
     MaskBits|=ALTBIT; [8ZDMe  
     break; jaS<*_~#R  
    case VK_CONTROL: ammi4k/  
     MaskBits|=CTRLBIT; ~M~DH-aX  
     break; 5SFr E`  
    case VK_SHIFT: }G4I9Py  
     MaskBits|=SHIFTBIT; "&L8d(ZuA  
     break; ,%!m%+K9a  
    default: //judge the key and send message VH7t^fb  
     break; hB [bth  
   } vNi;)"&*  
   for(int index=0;index<MAX_KEY;index++) ^}  {r@F  
   { *F$@!ByV  
    if(hCallWnd[index]==NULL) TE`5i~R*  
     continue; Va!G4_OT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^[hAj>7_8$  
    { =OufafZb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 7cc^n\c?Y  
     bProcessed=TRUE; -jQ*r$iRE  
    } hqRC:p#9  
   } 0 kJ8H!~u  
  } 4*_jGw  
  if(!bProcessed){ Mo/R+\u+Y  
   for(int index=0;index<MAX_KEY;index++){ PRfq_:xy  
    if(hCallWnd[index]==NULL) .Ys e/oEo  
     continue; &%J{uRp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) , ['}9:f9  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4U2{1aN`  
   } .AN1Yt  
  } Y9BQLu4F  
 } 8W3zrnc  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5OM #_.p  
} le*+(aw  
eKLvBa-{@  
BOOL InitHotkey() }6Pbjm*  
{ AA\)BNM  
 if(hHook!=NULL){ <B@NSj  
  nHookCount++; F .S^KK  
  return TRUE; F:/x7]7??Z  
 } ?NBae\6r  
 else !7t&d  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); bQD8#Ml1  
  if(hHook!=NULL) zw#n85=  
   nHookCount++; =r]l"T  
  return (hHook!=NULL); Xg~9<BGsi  
} stiF`l  
BOOL UnInit() RvG=GJJ9  
{ EPE_2a}  
 if(nHookCount>1){ NQD5=/o  
  nHookCount--; H&-3`<  
  return TRUE; ByY^d#oE  
 } d==0 @`  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 2n.HmS  
 if(unhooked==TRUE){ NX\AQVy9  
  nHookCount=0; ,nf}4  
  hHook=NULL; >/ _#+,  
 } R_!'=0}V  
 return unhooked; l/k-` LeW  
} )qx;/=D  
Tm^kZuT{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~q`f@I  
{ ;*?>w|t}w  
 BOOL bAdded=FALSE; [IHo ~   
 for(int index=0;index<MAX_KEY;index++){ 2 G.y.#W  
  if(hCallWnd[index]==0){ _DxHJl  
   hCallWnd[index]=hWnd; cs6oD!h  
   HotKey[index]=cKey; ti61&)(  
   HotKeyMask[index]=cMask; vom3 C9o  
   bAdded=TRUE; #ss/mvc3  
   KeyCount++; )4rt-_t<  
   break; Kyx9_2  
  } fXWy9 #M  
 } %N Q mV_1  
 return bAdded; k'r}@-X  
} yeyDB>#Va.  
h: yJ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) aV5M}:D  
{ 0SvPr [ >  
 BOOL bRemoved=FALSE; \MEBQ  
 for(int index=0;index<MAX_KEY;index++){ et5lfj  
  if(hCallWnd[index]==hWnd){ .I_atv  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7"eK<qJ  
    hCallWnd[index]=NULL; 89>}`:xS^  
    HotKey[index]=0; af<h2 r  
    HotKeyMask[index]=0; *zUK3&n~I  
    bRemoved=TRUE; ?OW!D?  
    KeyCount--; g}!{_z  
    break; \me5"ZU  
   } -] wEk%j  
  } 8XJi}YPQ  
 } 1j<uFhi>  
 return bRemoved; J2}poNmm  
} ^EiU>   
{9(0s| pr  
void VerifyWindow() -ED} 6E  
{ y pEMx'p  
 for(int i=0;i<MAX_KEY;i++){ k.C&6*l!5;  
  if(hCallWnd!=NULL){ } E ]l4N2  
   if(!IsWindow(hCallWnd)){ #b/L~Bw[  
    hCallWnd=NULL; dQT[pNp:  
    HotKey=0; a4UwhbH  
    HotKeyMask=0; ='jT 5Mg  
    KeyCount--; j^=Eu r/  
   } ]AQ}_dRi=  
  } fY^CI b$Y  
 } M(L6PyEa!Y  
} # bHkI~  
!p$p 7   
BOOL CHookApp::InitInstance() _<RTes  
{ PR5N:Bw  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); |Uics:cQC  
 hins=AfxGetInstanceHandle(); d<d3j9u(#  
 InitHotkey(); CNb(\]  
 return CWinApp::InitInstance(); @'>RGaPV  
} .X%J}c$  
EMP|I^  
int CHookApp::ExitInstance() )Xqjl  
{  g*a+$'  
 VerifyWindow(); PP{ 9Y Vr  
 UnInit(); P@PF" {S  
 return CWinApp::ExitInstance(); :pM 8Q1:B  
} >3p~>;9sc  
HnArj_E  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Btxtu"]nJo  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) |kK5:\H  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ mt+i0PIfj  
#if _MSC_VER > 1000 e_e\Ie/pDc  
#pragma once f2[R2sto@  
#endif // _MSC_VER > 1000 q{`1 [R  
M?YNK]   
class CCaptureDlg : public CDialog 5IUdA?  
{ "x R6~8  
 // Construction ]+Lr'HF  
 public: 2$Xof  
  BOOL bTray; |l8=z*v<  
  BOOL bRegistered; (mp  
  BOOL RegisterHotkey(); oc)`hg2=  
  UCHAR cKey; ;4!H- qZ  
  UCHAR cMask; MlYm\x8{M  
  void DeleteIcon(); (1|wM+)"  
  void AddIcon(); 8!|vp7/  
  UINT nCount; C W#:'  
  void SaveBmp(); Hy4;i^Ik <  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor +z nlf-  
  // Dialog Data F oC $X  
  //{{AFX_DATA(CCaptureDlg) |;NfH|43;  
  enum { IDD = IDD_CAPTURE_DIALOG }; *-PjcF}Y  
  CComboBox m_Key; e4Nd  
  BOOL m_bControl; ^7 \kvW  
  BOOL m_bAlt; Dx1(}D  
  BOOL m_bShift; x)=l4A\  
  CString m_Path; Eo2`Vr9g  
  CString m_Number; )M dddz4  
  //}}AFX_DATA #1U>  
  // ClassWizard generated virtual function overrides ]fzXrN_  
  //{{AFX_VIRTUAL(CCaptureDlg) UstUPO  
 public: +Kb 7N, "  
  virtual BOOL PreTranslateMessage(MSG* pMsg); xh:I]('R  
 protected: R/x3+_.f  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !b_(|~7Lc  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ["f6Ern  
  //}}AFX_VIRTUAL 27fLW&b2  
  // Implementation =V|jd'iwx  
 protected: 4ams~  
  HICON m_hIcon; C<C$df  
  // Generated message map functions {,JO}Dmu5  
  //{{AFX_MSG(CCaptureDlg) Mq<ob+  
  virtual BOOL OnInitDialog(); ;Tnid7:S  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?Fx~_GT  
  afx_msg void OnPaint(); hhaiH i!$  
  afx_msg HCURSOR OnQueryDragIcon(); ]?+i6 [6U  
  virtual void OnCancel(); =S{OzF  
  afx_msg void OnAbout(); :+DrV\)  
  afx_msg void OnBrowse(); SI~jM:S}  
  afx_msg void OnChange(); jbipNgxkr  
 //}}AFX_MSG vN^.MR+<  
 DECLARE_MESSAGE_MAP() pk9Ics;y  
}; KGM__ZO.  
#endif N<i5X.X  
oaqH@`  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file m|W17LhW{  
#include "stdafx.h" V3ozaVk;  
#include "Capture.h" ]O@iT= *3  
#include "CaptureDlg.h" I3.. Yk%7  
#include <windowsx.h> uCr& `  
#pragma comment(lib,"hook.lib") BJwuN  
#ifdef _DEBUG F8Ety^9>9  
#define new DEBUG_NEW "6\ 5eFN;  
#undef THIS_FILE z.8nYL5^}  
static char THIS_FILE[] = __FILE__; iOg4(SPci  
#endif U4=l`{5on  
#define IDM_SHELL WM_USER+1 k5E2{&wZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3bWGWI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qZ^ PC-  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 0\:= KIY.  
class CAboutDlg : public CDialog x7/Vf,N  
{ Oe;#q  
 public: w"?Q0bhV9y  
  CAboutDlg(); 86)2\uan  
  // Dialog Data ~g/"p`2-N  
  //{{AFX_DATA(CAboutDlg) 53{\H&q  
  enum { IDD = IDD_ABOUTBOX }; TiI/I`A  
  //}}AFX_DATA l SdA7  
  // ClassWizard generated virtual function overrides 8^}/T#l  
  //{{AFX_VIRTUAL(CAboutDlg) E#+2)Q  
 protected: RJ@79L *#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?)-6~p 4N  
  //}}AFX_VIRTUAL Mc.{I"c@  
  // Implementation |gI>Sp%Fu  
 protected: pFS@yHs  
  //{{AFX_MSG(CAboutDlg) Uo >aQk  
  //}}AFX_MSG 7 2JwG7qh  
  DECLARE_MESSAGE_MAP() I}bu  
}; %3qjgyLZ|  
pFY*Y>6ar  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ]0*aE  
{ iSO xQ  
 //{{AFX_DATA_INIT(CAboutDlg) aI&~aezmN  
 //}}AFX_DATA_INIT `hO%(9V9  
} 56z>/`=  
?@4Mt2Z\  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) x9>$197  
{ */h(4Hz  
 CDialog::DoDataExchange(pDX); 3XlQ4  
 //{{AFX_DATA_MAP(CAboutDlg) fE~KWLm  
 //}}AFX_DATA_MAP se %#U40*  
} + )Qu,%2   
_">F]ptI;  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) YCiG~y/~  
 //{{AFX_MSG_MAP(CAboutDlg) T;(,9>Qsu  
 // No message handlers 9JP:wE~y  
 //}}AFX_MSG_MAP > f X^NX  
END_MESSAGE_MAP() K+vD&Z^  
(G> su  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) HNS^:X R  
: CDialog(CCaptureDlg::IDD, pParent) P}8hK   
{ %>Gb]dv?  
 //{{AFX_DATA_INIT(CCaptureDlg) :4V5p =v-  
  m_bControl = FALSE; 9< ?w9D.1  
  m_bAlt = FALSE; <&b,%O  
  m_bShift = FALSE; ;S U<T^a  
  m_Path = _T("c:\\"); ?h4[yp=w  
  m_Number = _T("0 picture captured."); %cn 1d>M+I  
  nCount=0; 6"G(Iq'2t3  
  bRegistered=FALSE; "qq$i35x  
  bTray=FALSE; !6-t_S  
 //}}AFX_DATA_INIT &D M3/^70  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +:@^nPfHy  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); P?V+<c{  
} >KuNHuHu  
#).^k-  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ^5]9B<i[Y  
{ #6\m TL4vg  
 CDialog::DoDataExchange(pDX); 3g!Z[SZ  
 //{{AFX_DATA_MAP(CCaptureDlg) s U`#hL6;  
  DDX_Control(pDX, IDC_KEY, m_Key); .5; JnJI  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Pr} l y  
  DDX_Check(pDX, IDC_ALT, m_bAlt); [8za=B/  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); kEq~M10  
  DDX_Text(pDX, IDC_PATH, m_Path); h>!h|Ma  
  DDX_Text(pDX, IDC_NUMBER, m_Number); e=VSO!(rY  
 //}}AFX_DATA_MAP <~uzHg%Y  
} NxnR QS  
tZ[9qms^_  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) d [l8qaD  
//{{AFX_MSG_MAP(CCaptureDlg) B bmw[Qf\  
 ON_WM_SYSCOMMAND() @@\qso  
 ON_WM_PAINT() mH$`)i8  
 ON_WM_QUERYDRAGICON() h81giY]  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) VgXT4gO!  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) (nLzWvN  
 ON_BN_CLICKED(ID_CHANGE, OnChange) m#BXxS#B<_  
//}}AFX_MSG_MAP EwzcB\m  
END_MESSAGE_MAP() w&H>`l06  
NE#`ZUr3  
BOOL CCaptureDlg::OnInitDialog() WVyDE1K <  
{ 7fypUQ:y  
 CDialog::OnInitDialog(); W]Xwt'ABz  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); bJMsB|r  
 ASSERT(IDM_ABOUTBOX < 0xF000); EgG3XhfS  
 CMenu* pSysMenu = GetSystemMenu(FALSE); c=tbl|Cq  
 if (pSysMenu != NULL) w%`S>+kX&  
 { /F.<Gz;w  
  CString strAboutMenu; &,{ >b[  
  strAboutMenu.LoadString(IDS_ABOUTBOX); l\L71|3"g  
  if (!strAboutMenu.IsEmpty()) [O\ )R[J  
  { iuWUr?`\  
   pSysMenu->AppendMenu(MF_SEPARATOR); b&yuy  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0Md.3kY  
  } % m6qL  
 } '~ B2[  
 SetIcon(m_hIcon, TRUE); // Set big icon vWmt<E|e  
 SetIcon(m_hIcon, FALSE); // Set small icon K@n-#  
 m_Key.SetCurSel(0); ugN%8N  
 RegisterHotkey(); 02EX_tt),  
 CMenu* pMenu=GetSystemMenu(FALSE); Yz2N(g[  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); =A,T:!}'  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); L=;T$4+p  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); FUSe!f  
 return TRUE; // return TRUE unless you set the focus to a control ^(  
} $'CS/U`E}  
r ts2Jk7f  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <=|^\r !}&  
{ 1:<n(?5JI  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) p}==aNZK  
 { "a;$uW@.6  
  CAboutDlg dlgAbout; O6$,J1 2l  
  dlgAbout.DoModal(); S ^~"#   
 } , SUx!o  
 else F}mt *UcMG  
 { GTbV5{Ss  
  CDialog::OnSysCommand(nID, lParam); E2}X[EoBF  
 } KJ/Gv#Kj  
} &jEw(P&_  
/NB|N*}O)  
void CCaptureDlg::OnPaint() M3UC9t9]  
{ J0k!&d8  
 if (IsIconic()) Tr>_R%bK  
 { 9E5*%Hu_  
  CPaintDC dc(this); // device context for painting yT<"?S>D  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); n'vdA !R  
  // Center icon in client rectangle ? .B t.  
  int cxIcon = GetSystemMetrics(SM_CXICON); m==DBh  
  int cyIcon = GetSystemMetrics(SM_CYICON); z+oy#p6+F.  
  CRect rect; 7~"eT9W V  
  GetClientRect(&rect); i,~(_|-r  
  int x = (rect.Width() - cxIcon + 1) / 2; rgXX,+cO  
  int y = (rect.Height() - cyIcon + 1) / 2; q}jh>`d  
  // Draw the icon xC + >R1)  
  dc.DrawIcon(x, y, m_hIcon); ])qnPoQ<n  
 } lrkgsv6  
 else LsGO~EiJ  
 { 3`D*AFQc  
  CDialog::OnPaint(); `;G@qp:A  
 } Jon3ywd1Y  
} EpACd8Fb  
C+!=C{@7di  
HCURSOR CCaptureDlg::OnQueryDragIcon() Y[b08{/  
{ xv>8rW(Np5  
 return (HCURSOR) m_hIcon; 9`qw,X&AK_  
} WllQM,h  
p:tp |/  
void CCaptureDlg::OnCancel() 9:%')M&Q  
{ i\ 7JQZ  
 if(bTray) cfBl HeYE  
  DeleteIcon(); %t* 9sh  
  CDialog::OnCancel(); Q>X1 :Zn3  
} pdN8 hJ  
zO9WqP_`iR  
void CCaptureDlg::OnAbout() c<q33dZ!*  
{ Tl"r#  
 CAboutDlg dlg; vfT @;`  
 dlg.DoModal(); ^Hf?["m^@  
} {LKW%G7  
?Nt m5(R  
void CCaptureDlg::OnBrowse() Su@V5yz  
{ 3&[d.,/  
 CString str; _W Hi<,-  
 BROWSEINFO bi; +Y+fM  
 char name[MAX_PATH]; 0%rE*h9+  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 9. FXbNYg  
 bi.hwndOwner=GetSafeHwnd(); Mf5*Wjz.Mc  
 bi.pszDisplayName=name; 4Af7x6a;  
 bi.lpszTitle="Select folder"; \ D>!&   
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 0"\js:-$  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); USgO`l\}4  
 if(idl==NULL) 6R3/"&P(/#  
  return; l:~ >P[  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Ea" -n9  
 str.ReleaseBuffer(); @GweNo`p7  
 m_Path=str; #Wl9[W/4  
 if(str.GetAt(str.GetLength()-1)!='\\') Hjs#p{t[  
  m_Path+="\\"; g( "[wqgG  
 UpdateData(FALSE); n|.>41bJ  
} lUnC+w#[  
um". Z4S  
void CCaptureDlg::SaveBmp() {^:i}4ZRl  
{ {vd +cE  
 CDC dc; 4e[ 0.2?  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); qpf|.m  
 CBitmap bm; <gvgr4@^yR  
 int Width=GetSystemMetrics(SM_CXSCREEN); 04X/(74  
 int Height=GetSystemMetrics(SM_CYSCREEN); }*P;kV  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ;;^?vS  
 CDC tdc; bV)h\:oC  
 tdc.CreateCompatibleDC(&dc); F&+_z&n)  
 CBitmap*pOld=tdc.SelectObject(&bm); 0x,4H30t(  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); }lx'NY~(W  
 tdc.SelectObject(pOld); ]xV2= !J  
 BITMAP btm; apxq] ! `  
 bm.GetBitmap(&btm); U6nC <3f F  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; KAT^vbR  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Hnvs{KC`  
 BITMAPINFOHEADER bih; o(i?_4 E  
 bih.biBitCount=btm.bmBitsPixel; /T&+vzCF  
 bih.biClrImportant=0; YpSK |(  
 bih.biClrUsed=0; a\ MJh+K  
 bih.biCompression=0; Q;z'"P   
 bih.biHeight=btm.bmHeight; >O1u![9K|w  
 bih.biPlanes=1; 9Pm|a~[m  
 bih.biSize=sizeof(BITMAPINFOHEADER); =p8iYtI  
 bih.biSizeImage=size; ))6iVgSE$  
 bih.biWidth=btm.bmWidth; kQ6YQsJ.*  
 bih.biXPelsPerMeter=0; !*k'3r KOW  
 bih.biYPelsPerMeter=0; `LTD|0;  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 2F,?}jJ.K  
 static int filecount=0; Ao9=TC'v$'  
 CString name; riglEA[^  
 name.Format("pict%04d.bmp",filecount++); FePWr7Ze  
 name=m_Path+name; t/x]vCP,2D  
 BITMAPFILEHEADER bfh; Zq/=uB7Z  
 bfh.bfReserved1=bfh.bfReserved2=0; `g}en%5b\  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 2DBFY1[Pk  
 bfh.bfSize=54+size; ,f~8:LHq  
 bfh.bfOffBits=54; i[e-dT:*R  
 CFile bf; 6,p;8I  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ b:*( f#"q  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); "? 5@j/ e`  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); -A"0mS8L  
  bf.WriteHuge(lpData,size); g3'yqIjQL  
  bf.Close(); >ufN[ab  
  nCount++; GtqA@&5&  
 } c#[d7t8ONe  
 GlobalFreePtr(lpData); a&n}pnEn)  
 if(nCount==1) !xC IvKW  
  m_Number.Format("%d picture captured.",nCount); c=:A/z{  
 else PtKrks|y  
  m_Number.Format("%d pictures captured.",nCount); 4':U rJ+  
  UpdateData(FALSE); EhIa31>X  
} WWIQ6EJO  
d[e;Fj!  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) *ur[u*g  
{ Zdu8axK:  
 if(pMsg -> message == WM_KEYDOWN) Bn d Y\  
 { Wl>$<D4mO[  
  if(pMsg -> wParam == VK_ESCAPE) 9>L{K   
   return TRUE; KSl@V>!_  
  if(pMsg -> wParam == VK_RETURN) yuB\Z/  
   return TRUE; .t%` "C  
 } ^ G>/;mZ  
 return CDialog::PreTranslateMessage(pMsg); lz0'E'%{P  
} 0\Myhh~DLE  
{F$MZ2E  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Si[xyG6=  
{ ].*I Z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ! lm0zR  
  SaveBmp(); ^: V6=  
  return FALSE; (qy82F-|2  
} x4S0C[k  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ TSYe ~)I  
 CMenu pop; a)M#O\i`  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); OD1>s6uA7  
 CMenu*pMenu=pop.GetSubMenu(0); \]p[DYBY#  
 pMenu->SetDefaultItem(ID_EXITICON); bQ_N^[oxQ  
 CPoint pt; 'sAs#  
 GetCursorPos(&pt); !p e!Z-,  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ^sZ,(sc{G  
 if(id==ID_EXITICON) .:+&2#b  
  DeleteIcon(); $x1PU67  
 else if(id==ID_EXIT) 7{DSLKtN  
  OnCancel(); (Z};(Hn  
 return FALSE; F5EsaF'e4  
} 3ES3, uR  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 8#~x6\!b  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Ru^j~Cj5  
 AddIcon(); <-a6'g2y  
 return res; -MH~1Tw6Z  
} 9iQc\@eGd  
w}QU;rl8q  
void CCaptureDlg::AddIcon() -D30(g{O  
{ NYN(2J  
 NOTIFYICONDATA data; km#Rh^  
 data.cbSize=sizeof(NOTIFYICONDATA); oSqkAAGz\  
 CString tip; 79Si^n1\  
 tip.LoadString(IDS_ICONTIP); `!iVMTp  
 data.hIcon=GetIcon(0); G~Mxh,aD$>  
 data.hWnd=GetSafeHwnd(); .R>4'#8q  
 strcpy(data.szTip,tip); LIDYKKDJ^  
 data.uCallbackMessage=IDM_SHELL; hNJubTSE+)  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; TYh_uox6  
 data.uID=98; 6(.]TEu0  
 Shell_NotifyIcon(NIM_ADD,&data); \HZ]=B#0  
 ShowWindow(SW_HIDE); Rd{#cW~  
 bTray=TRUE; H$n{|YO `  
} C@[f Z  
:%vD hMHa  
void CCaptureDlg::DeleteIcon() 75t5:>"[  
{ 9zK5Y+!  
 NOTIFYICONDATA data; ^ s@'nKc  
 data.cbSize=sizeof(NOTIFYICONDATA); W"L;8u  
 data.hWnd=GetSafeHwnd(); ,~,{$\p   
 data.uID=98; (#;<iu}  
 Shell_NotifyIcon(NIM_DELETE,&data); $j!VJGVG  
 ShowWindow(SW_SHOW); N=P+b%%:Z  
 SetForegroundWindow(); F`\7&'I  
 ShowWindow(SW_SHOWNORMAL); ZI'Mr:z4  
 bTray=FALSE; an9k2 F.)  
} ~kAen  
\a6knd  
void CCaptureDlg::OnChange() MX{p)(HW  
{ .V:H~  
 RegisterHotkey(); $x %VUms  
} VY=c_Gl  
g<r'f"^  
BOOL CCaptureDlg::RegisterHotkey() ;\Vi~2!8  
{ /_ MEb42&  
 UpdateData(); cfEi]  
 UCHAR mask=0; 2m/=0sb\{  
 UCHAR key=0; 'v*Y7zZ#K  
 if(m_bControl) BVpRkUC"  
  mask|=4; L=wg"$  
 if(m_bAlt) hhVyz{u  
  mask|=2; m;"i4!  
 if(m_bShift) MHVHEwr.{  
  mask|=1; e+5]l>3)f  
  key=Key_Table[m_Key.GetCurSel()]; K6Gri>Um  
 if(bRegistered){ fhZD#D  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \f7A j>  
  bRegistered=FALSE; 3Vj,O?(Z  
 } On{p(| l  
 cMask=mask; V=,VOw4  
 cKey=key; ,3`RM $  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); AK*F,H9  
 return bRegistered; U0kEhMIIf  
} _jW}p-j  
TZ,kmk#  
  四、小结 szy^kj^2  
9"YOj_z  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
批量上传需要先选择文件,再选择上传
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八