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用Visual C++实现屏幕抓图程序

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 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: w.58=Pr  
  M *w{PjU  
  一、实现方法 PY_8*~Z  
4r4 #u'Om  
  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: T5T%[Gv  
a6 vej  
#pragma data_seg("shareddata") bDl#806PL  
HHOOK hHook =NULL; //钩子句柄 !0lk}Uzkh  
UINT nHookCount =0; //挂接的程序数目 N4,oO H~  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 C[%Qg=<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 55s5(]`d  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey P]n0L4c  
static int KeyCount =0; 0fX` >-X  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ,u>LAo0  
#pragma data_seg() ORrZu$n`p  
yq|yGf(4&  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 |*JMPg?zI  
D|(\5]:R  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: (<>??(VM  
XgX~K:<jt  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR kiJ=C2'&  
cKey,UCHAR cMask) &!4E3&+2m  
{ <o|fH~?X  
 BOOL bAdded=FALSE; c6 &k?Puy  
 for(int index=0;index<MAX_KEY;index++){ <vWP_yy  
  if(hCallWnd[index]==0){ rK'Lvt@w  
   hCallWnd[index]=hWnd; b||usv[or  
   HotKey[index]=cKey; o@gceZuk  
   HotKeyMask[index]=cMask; #pPOQv:~  
   bAdded=TRUE; (bv{1 7K  
   KeyCount++; :@jctH~  
   break; %ZD]qaU0  
  } W7 A!QS  
 } Ox#vW6;)  
 return bAdded; uQc("F  
} VsSAb%  
//删除热键 v#{Nh8n  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U - OD  
{ ^G`6Zg;  
 BOOL bRemoved=FALSE; l4i 51S"  
 for(int index=0;index<MAX_KEY;index++){ >vo 6X]p~  
  if(hCallWnd[index]==hWnd){ -){6ynqv  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |dEPy- Xe  
    hCallWnd[index]=NULL; o_Z9\'u  
    HotKey[index]=0; )nf%S+KV  
    HotKeyMask[index]=0; ?" 4X&6xl  
    bRemoved=TRUE; 8y6dT  
    KeyCount--; *#>(P  
    break; pLe4dz WA  
   } @2. :fK  
  } eE'>kP}  
 } -4+'(3qr  
 return bRemoved; &&l ZUR,`  
} *cM=>3ws/  
{1Cnrjw  
75p9_)>96  
  DLL中的钩子函数如下: mZB:j]T  
\Y"S4<"R  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0 cKsGDm  
{ 2;T?ry7  
 BOOL bProcessed=FALSE; ?bM%#x{e  
 if(HC_ACTION==nCode) Uf+y$n-  
 { : 8>zo  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 bC+Z R{M  
   switch(wParam) |~%RSS~b*  
   {  E8Kk )7  
    case VK_MENU: y "+'4:_  
     MaskBits&=~ALTBIT; j;uUM6  
     break; > "rM\ Q  
    case VK_CONTROL: @mZK[*Ak<*  
     MaskBits&=~CTRLBIT; nI?*[y}  
     break; j?*n@'   
    case VK_SHIFT: $!. [R}  
     MaskBits&=~SHIFTBIT; r4[=pfe25  
     break; Tv7W)?3h  
    default: //judge the key and send message K_Y{50#  
     break; BMO,eQcB  
   } jt}oq%Bf  
   for(int index=0;index<MAX_KEY;index++){ @1'OuX^  
    if(hCallWnd[index]==NULL) VtzZ1/J E  
     continue; &TRKd)wd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aWimg6q  
    { |-vyhr 0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  "2%R?  
     bProcessed=TRUE; w uY-f4  
    } <-N eusx%  
   } xib}E[-l#  
  } JdI*@b2k[  
  else if((lParam&0xc000ffff)==1){ //有键按下 yB7si(,1>  
   switch(wParam) =%I[o=6  
   {  U%r{{Q1  
    case VK_MENU: S+KKGi_e  
     MaskBits|=ALTBIT; *0,*F~n  
     break; 32+N?[9 *  
    case VK_CONTROL: fhZwYx&t  
     MaskBits|=CTRLBIT;  ::02?  
     break; 0_je@p+$  
    case VK_SHIFT: ynra%"sd  
     MaskBits|=SHIFTBIT; 6 [XaIco=C  
     break; {BM:c$3@j  
    default: //judge the key and send message ApSseBhh  
     break; P\WHM(  
   } }P%gwgPK  
   for(int index=0;index<MAX_KEY;index++){ $I-iq @  
    if(hCallWnd[index]==NULL) i/ o  
     continue; `2U,#nZ 4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "?k'S{;  
    { +,"[0RH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); GB `n  
     bProcessed=TRUE; } -4p8Zt  
    } *{5}m(5F  
   } `m1stK(PO  
  } Rq|5%;1  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 RgFpc*.T  
   for(int index=0;index<MAX_KEY;index++){ M6cybEk`  
    if(hCallWnd[index]==NULL) n5xG4.#G  
     continue; dk]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) (:~_#BA  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); pvt/{  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 7.NL>:lu  
   } JYjc^m  
  } H4v%$R;K  
 } o+OX^F0  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *tZ3?X[b  
} UE_>@_T  
BSy4 d>  
  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: 4V@0L  
GPAC0K^p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vr47PM2al  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }T902RL0  
vQXF$/S  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: myXGMN$i  
Jt8M;Yk  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) P >0S ZP  
{ uq:'`o-1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) uJ=&++[  
 { `$ bQ8$+Ci  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 jc6~V$3  
  SaveBmp(); u (r T2  
  return FALSE; "OUY^ cM  
 } Zq1> M'V;  
 …… //其它处理及默认处理 UBM8l  
} ,9=P=JH  
=fBr2%qK  
G@ybx[_[@  
  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。 +A,cdi9z  
b2F1^]p  
  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。 %E, -dw  
;ACeY  
  二、编程步骤 {QK9pZB  
4b yh,t  
  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"; w\t  
2s 9U&  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 'uUa|J1mu  
?\Y7]_]/  
  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; 0x'Fi2=`  
$3#oA.~R/  
  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; R'K /\   
~c1~) QzZ  
  5、 添加代码,编译运行程序。 ,h3,& ,  
 ;XYfw)  
三、程序代码 ~|KMxY(:  
?aG~E  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL jAt6 5a  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) `b@"GOr  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ I GcR5/3  
#if _MSC_VER > 1000 S9/\L6Rmf  
#pragma once [MC}zd'/  
#endif // _MSC_VER > 1000 8^-g yx'  
#ifndef __AFXWIN_H__ Z.>?Dt  
#error include 'stdafx.h' before including this file for PCH !})3Fb  
#endif 5U<o%+^El  
#include "resource.h" // main symbols A]V<K[9:b  
class CHookApp : public CWinApp mW_A 3S5  
{ |("5 :m  
 public: 9*|An  
  CHookApp(); Ke&fTK  
  // Overrides ;rF:$37^  
  // ClassWizard generated virtual function overrides gY=+G6;=<  
  //{{AFX_VIRTUAL(CHookApp) 6d 8n1_  
 public: N) z] F9Kg  
  virtual BOOL InitInstance(); Q([g1?F9*  
  virtual int ExitInstance(); v#IZSBvuQK  
  //}}AFX_VIRTUAL 8>:2li  
  //{{AFX_MSG(CHookApp) HoM8V"8B  
  // NOTE - the ClassWizard will add and remove member functions here. VxAR,a1+n  
  // DO NOT EDIT what you see in these blocks of generated code ! }Ty_ } 6a5  
  //}}AFX_MSG DNM~/Oo  
  DECLARE_MESSAGE_MAP() n_] OYG>U  
}; 483vFLnF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); zwHTtE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `Sj8<O}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); CV7.hF<  
BOOL InitHotkey(); z!j`Qoh?V9  
BOOL UnInit(); wA)R7%&  
#endif ]zK} X!  
%}&9[#  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. L' h'm{i  
#include "stdafx.h" xhMdn3~U  
#include "hook.h" f.r-,%^6{  
#include <windowsx.h> Y!s/uvRI  
#ifdef _DEBUG t,P +~ A  
#define new DEBUG_NEW |y=D^NTG  
#undef THIS_FILE %n c+VL4  
static char THIS_FILE[] = __FILE__; c Ky%0oTla  
#endif N=L urXv  
#define MAX_KEY 100 }mJ)gK5b 6  
#define CTRLBIT 0x04 X}bgRzj  
#define ALTBIT 0x02 DFjkp;`1  
#define SHIFTBIT 0x01 tv|=`~Y  
#pragma data_seg("shareddata") oq<#  
HHOOK hHook =NULL; Bp6Evi  
UINT nHookCount =0;  Q{Bj(f  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 7y`~T+  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT bmddh2  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ]X _&  
static int KeyCount =0; f%auz4CZz  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift m :^,qC  
#pragma data_seg() Ox43(S0~  
HINSTANCE hins; 86} rz  
void VerifyWindow(); +l3 vIN  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) QU4'x4YS  
//{{AFX_MSG_MAP(CHookApp) cRfX  
// NOTE - the ClassWizard will add and remove mapping macros here. @o^sp|k !  
// DO NOT EDIT what you see in these blocks of generated code! Vgm{=$  
//}}AFX_MSG_MAP %I=J8$B]f  
END_MESSAGE_MAP() Y2D) $  
{5z?5i ?D  
CHookApp::CHookApp() >\p}UPx  
{ KJkcmF}Q  
 // TODO: add construction code here, @',;/j80  
 // Place all significant initialization in InitInstance K|1^?#n  
} p9sxA|O=y  
4-n.4j|  
CHookApp theApp; I5"=b}V5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {DO9{96w4  
{ 0UB'6wRVo  
 BOOL bProcessed=FALSE; XKK*RVs#  
 if(HC_ACTION==nCode) ]ogy`O>  
 { BR%:`uiQ<  
  if((lParam&0xc0000000)==0xc0000000){// Key up (c_hX(  
   switch(wParam) p]g/iLDZ  
   { 2I4P":q  
    case VK_MENU: q B 2#EsZ  
     MaskBits&=~ALTBIT; lJ,s}l7  
     break; |O+binq  
    case VK_CONTROL: xO@OkCue  
     MaskBits&=~CTRLBIT; %`\{Nx k  
     break; nz&JG~Qfm  
    case VK_SHIFT: J/*[wj  
     MaskBits&=~SHIFTBIT; ^~I  
     break; 5astv:p,P  
    default: //judge the key and send message  MU^Z*r  
     break; )T+htD)  
   } gddGl=rm  
   for(int index=0;index<MAX_KEY;index++){ y@z #Jw<  
    if(hCallWnd[index]==NULL) Stw6%T-  
     continue; Te13Af~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) gy[uq m_ T  
    { 0\o'd\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *Ee# x!O  
     bProcessed=TRUE; %qv7;E2C  
    } zC^Ib&gm>,  
   } 8vP)qy8  
  } ouI0"R&@  
  else if((lParam&0xc000ffff)==1){ //Key down pQhv3F  
   switch(wParam) 5f5`7uVJF  
   { yiUdUw/  
    case VK_MENU: uQNoIy J)  
     MaskBits|=ALTBIT; dA~6{*)  
     break;  h 2zCX  
    case VK_CONTROL: y%y#Pb |  
     MaskBits|=CTRLBIT; ij),DbWd  
     break; RPWYm  
    case VK_SHIFT: ro{MD s  
     MaskBits|=SHIFTBIT; M>#{~zr  
     break; "869n37  
    default: //judge the key and send message M@3H]t?  
     break; :U> oW97l  
   } XDGZqkt  
   for(int index=0;index<MAX_KEY;index++) 1&<@(S<  
   { VQ; =-95P  
    if(hCallWnd[index]==NULL) _V?Q4}7d/  
     continue; \CGcP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1XKk~G"D  
    { $b$D[4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); (qrT0D6  
     bProcessed=TRUE; 9+']`=a:  
    } 5W48z%MN  
   } o5R\7}]GE  
  } 6M9rC[h\  
  if(!bProcessed){ zl[JnVF\6  
   for(int index=0;index<MAX_KEY;index++){ {mQJ6 G'ny  
    if(hCallWnd[index]==NULL) #@fypCc  
     continue; 2 ^aTW`>L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A0ToX) |C  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !ZZAI_N  
   } ;a`X|N9  
  } 2o/`8+eJu  
 } Fqv5WoYVf  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); qr 9 F  
} loJ0PY'}=  
wGH@I_cy>  
BOOL InitHotkey() %r"GL  
{ NC}#P< U  
 if(hHook!=NULL){ u| c+w)a  
  nHookCount++; v(O.GhJ@  
  return TRUE; ;=OH=+R l  
 } =.c"&,c?L  
 else vo-{3]u#=  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); :Eyv==  
  if(hHook!=NULL) 5,Y2Lzr  
   nHookCount++; d8#j@='a*  
  return (hHook!=NULL); ?+\,a+46P_  
} 7fqYSMHR  
BOOL UnInit() nz\fN?q  
{ <GN?J.B  
 if(nHookCount>1){ De_</1Au!2  
  nHookCount--; 8rYK~Sz  
  return TRUE; }t'^Au`X  
 } fL;p^t u3  
 BOOL unhooked = UnhookWindowsHookEx(hHook); h~p}08  
 if(unhooked==TRUE){ hd;I x%tq>  
  nHookCount=0; rzHa&:Y  
  hHook=NULL; $5r,Q{;$  
 } -wfV  
 return unhooked; *zWn4BckN  
} 'r%oOZk)z  
@\?f77Of6  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3D0I5LF&  
{ z<>_*Lfj  
 BOOL bAdded=FALSE; (T01hR&  
 for(int index=0;index<MAX_KEY;index++){ t,,^^ll  
  if(hCallWnd[index]==0){ v"+EBfx  
   hCallWnd[index]=hWnd;  $wTX  
   HotKey[index]=cKey; .)w0C%]  
   HotKeyMask[index]=cMask; `uHpj`EU  
   bAdded=TRUE; \irjIXtV  
   KeyCount++; F948%?a  
   break; kVv <tw  
  } xF;v 6d  
 } 1\0@?6`^  
 return bAdded; r.;iO0[/  
} Rjl__90  
rR~X>+K  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `WS_*fJ5  
{ 8)8oR&(f  
 BOOL bRemoved=FALSE; 2\de |'  
 for(int index=0;index<MAX_KEY;index++){ ~*Qpv&y)  
  if(hCallWnd[index]==hWnd){ x["  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ nif' l/@"  
    hCallWnd[index]=NULL; [udV }  
    HotKey[index]=0; %LHV0u  
    HotKeyMask[index]=0; gUA}%YXe  
    bRemoved=TRUE; Pltju4.:C  
    KeyCount--; -d'|X`^nE  
    break; x~^I/$  
   } |81N/]EER  
  } 6~W E#z_  
 } ycD.:w p\'  
 return bRemoved; YCO:bBmp:  
} W2qQKv  
%)Dd{|c  
void VerifyWindow() QL18MbfqP  
{ T9-a uK0d  
 for(int i=0;i<MAX_KEY;i++){ yW?%c#9D  
  if(hCallWnd!=NULL){ T l(uqY?9  
   if(!IsWindow(hCallWnd)){ &Ld8Z9IeFp  
    hCallWnd=NULL; #9VY[<  
    HotKey=0; #/<Y!qV&  
    HotKeyMask=0; !p2,|6Y`y  
    KeyCount--; J6D$ i+  
   } Ilb |:x"L  
  } Fjt,  
 } $ n[7  
} $#3<rcOq  
z|)1l`  
BOOL CHookApp::InitInstance() [Od9,XBa  
{ C /XyDbH  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); h##?~!xDmq  
 hins=AfxGetInstanceHandle(); }p?V5Qp  
 InitHotkey(); Vj`s_IPY  
 return CWinApp::InitInstance(); Q$/FgS  
} "0zXpQi,B  
M|e n>P  
int CHookApp::ExitInstance() (Gc`3jJ  
{ l zPS RT  
 VerifyWindow(); <|Eby!KXR  
 UnInit(); |S`yXsg  
 return CWinApp::ExitInstance(); 9R"N#w.U]  
} <L/vNP  
sNmC#,  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file p+UHJ&  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) <JM%Kn )  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ F6]!?@  
#if _MSC_VER > 1000 4~YQ\4h=  
#pragma once +gCy@_2;  
#endif // _MSC_VER > 1000 P Xn>x8z  
1'm`SRX#e  
class CCaptureDlg : public CDialog i}F;fWZ`  
{ )h_ 7 2  
 // Construction ]{+M>i[  
 public: [k 7N+W8  
  BOOL bTray; JD`;,Md  
  BOOL bRegistered; udI: ]:,P  
  BOOL RegisterHotkey(); |O+>#  
  UCHAR cKey; yi-"hT`  
  UCHAR cMask; A<X :K nl  
  void DeleteIcon(); j{Jc6U  
  void AddIcon(); U{uWk3I_b  
  UINT nCount; =k<4mlok^  
  void SaveBmp(); #s R0*  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ';|>`<  
  // Dialog Data {^5<{j3e  
  //{{AFX_DATA(CCaptureDlg) )k] !u  
  enum { IDD = IDD_CAPTURE_DIALOG }; V3~a!k  
  CComboBox m_Key; 8421-c6y>  
  BOOL m_bControl; jI2gi1 ,a  
  BOOL m_bAlt; ^ O Xr: P  
  BOOL m_bShift; JKi@Kw  
  CString m_Path; ;4v}0N~.  
  CString m_Number; P9mxY*K)%5  
  //}}AFX_DATA "q>I?UcZ  
  // ClassWizard generated virtual function overrides 5J\|gZQF  
  //{{AFX_VIRTUAL(CCaptureDlg) ;@YF}%!+W  
 public: xgqv2s>L  
  virtual BOOL PreTranslateMessage(MSG* pMsg); uQtk|)T E  
 protected: <bXWkj  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S]%U]  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Dw/Gha/  
  //}}AFX_VIRTUAL ;E?  hz  
  // Implementation Vt)\[Tl~  
 protected: 2{]S_. zV  
  HICON m_hIcon; `NWgETf^#  
  // Generated message map functions ,#jhKnk2e  
  //{{AFX_MSG(CCaptureDlg) +9 p`D  
  virtual BOOL OnInitDialog(); 2|H91Y2  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 9eN2)a/  
  afx_msg void OnPaint(); VO;UV$$  
  afx_msg HCURSOR OnQueryDragIcon(); !0csNg!  
  virtual void OnCancel(); $aPHl  
  afx_msg void OnAbout(); [g h[F  
  afx_msg void OnBrowse(); LXu"rfp  
  afx_msg void OnChange(); %v+fN?%x,d  
 //}}AFX_MSG u"8;fS  
 DECLARE_MESSAGE_MAP() nL(%&z \4  
}; +b,31  
#endif xAd>",=~  
s3_e7D ^H  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file PVS<QN%  
#include "stdafx.h" ) 4L%zl7  
#include "Capture.h" V3A>Ag+^~  
#include "CaptureDlg.h" /$Tl#   
#include <windowsx.h> Sd<@X@iU8D  
#pragma comment(lib,"hook.lib") Fx[A8G  
#ifdef _DEBUG rq(~/Yc  
#define new DEBUG_NEW ,[}yf#8@J  
#undef THIS_FILE c<h!QnJ  
static char THIS_FILE[] = __FILE__; O *J_+6  
#endif |h=+&*(:  
#define IDM_SHELL WM_USER+1 hr!f: D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ADv"_bB:h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {Sr=SE  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 97]a-)SA  
class CAboutDlg : public CDialog S-LZ(o{ZL  
{ SC $`  
 public: >SxZ9T|%  
  CAboutDlg(); @X|i@{<';  
  // Dialog Data igj={==m  
  //{{AFX_DATA(CAboutDlg) oF@x]bmU  
  enum { IDD = IDD_ABOUTBOX }; ULNAH`{D  
  //}}AFX_DATA DNW2;i<hsz  
  // ClassWizard generated virtual function overrides Ub'%pU  
  //{{AFX_VIRTUAL(CAboutDlg) +{C9uY)$vf  
 protected: #[U 9(44,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support fr'huvc  
  //}}AFX_VIRTUAL Hr<C2p^a  
  // Implementation eb.cq"C  
 protected: @( n^S?(  
  //{{AFX_MSG(CAboutDlg) 16[-3cJ T  
  //}}AFX_MSG `Ge+(1x  
  DECLARE_MESSAGE_MAP() jqX@&}3@  
}; zOiY0`=  
/\-2l+y>J  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) =,C9O  
{ 3u?`q%Y-e  
 //{{AFX_DATA_INIT(CAboutDlg) y3KcM#[  
 //}}AFX_DATA_INIT E&];>3C  
} s=nVoc{Yt  
,h@R' f !  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) mP)3cc5T  
{ {KU.  
 CDialog::DoDataExchange(pDX); r{q}f)  
 //{{AFX_DATA_MAP(CAboutDlg) `j}_BW_  
 //}}AFX_DATA_MAP _Vo)<--+I  
} 'Wf?elB+  
1A?\BJ"  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 5U)ab3 :  
 //{{AFX_MSG_MAP(CAboutDlg) aW=By)S!Y  
 // No message handlers PHRGhKJW})  
 //}}AFX_MSG_MAP 9b"9m*gC  
END_MESSAGE_MAP() `s>UU- 9  
h5&/hBN  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %su}Ru  
: CDialog(CCaptureDlg::IDD, pParent) L8bI0a]r"*  
{ OBI+<2`Oc  
 //{{AFX_DATA_INIT(CCaptureDlg) 0~Iu7mPY  
  m_bControl = FALSE; up3?$hUc.  
  m_bAlt = FALSE; T}n}.JwU  
  m_bShift = FALSE; @@%i( >4Z  
  m_Path = _T("c:\\"); jNe(w<',P  
  m_Number = _T("0 picture captured."); wUK7um  
  nCount=0; o9m  
  bRegistered=FALSE; tIGVB+g{F  
  bTray=FALSE; B=Zl&1  
 //}}AFX_DATA_INIT lJ:M^.Em0  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 d`9W  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); pwFU2}I  
} c?!YFm  
/lS+J(I  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) kfqpI  
{ e~+(7_2  
 CDialog::DoDataExchange(pDX); =mHkXHE~:  
 //{{AFX_DATA_MAP(CCaptureDlg) E7X!cm/2<  
  DDX_Control(pDX, IDC_KEY, m_Key); m/YH^N0  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); $N}/1R^?r  
  DDX_Check(pDX, IDC_ALT, m_bAlt); VX^o"9Ntl  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); jFuC=6aF  
  DDX_Text(pDX, IDC_PATH, m_Path); ]g;^w?9h  
  DDX_Text(pDX, IDC_NUMBER, m_Number); J+)'-OFt0  
 //}}AFX_DATA_MAP MvFM ,  
} J$#h( D%  
&jV9*  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ?~"`^|d  
//{{AFX_MSG_MAP(CCaptureDlg) ^w:OS5%R  
 ON_WM_SYSCOMMAND() 0W T#6D  
 ON_WM_PAINT() 5:Yck<  
 ON_WM_QUERYDRAGICON() c Ndw9?Z  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) .7 (DxN  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) V&Xi> X8  
 ON_BN_CLICKED(ID_CHANGE, OnChange) y4xT:G/M  
//}}AFX_MSG_MAP E /fw?7eQ  
END_MESSAGE_MAP() 4GG1E. z}  
SXRdNPXFO  
BOOL CCaptureDlg::OnInitDialog() <91t`&aWW  
{ *2JH_Cj`  
 CDialog::OnInitDialog(); o {=qC:b  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); I?_E,.)[ I  
 ASSERT(IDM_ABOUTBOX < 0xF000); [_y9"MMwn  
 CMenu* pSysMenu = GetSystemMenu(FALSE);  }Vvsh3  
 if (pSysMenu != NULL) "sF Xl  
 { LXHwX*`Y  
  CString strAboutMenu; 7"ylN"syZ  
  strAboutMenu.LoadString(IDS_ABOUTBOX); jW-;4e*H=V  
  if (!strAboutMenu.IsEmpty()) J0^{,eY<  
  { cPpu  
   pSysMenu->AppendMenu(MF_SEPARATOR); 5cD XWF  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); h [nH<m  
  } n?'d|h  
 } &EAk z  
 SetIcon(m_hIcon, TRUE); // Set big icon <,jAk4  
 SetIcon(m_hIcon, FALSE); // Set small icon <Ctyht0c.  
 m_Key.SetCurSel(0); ,f} h}  
 RegisterHotkey(); H4M{_2DO  
 CMenu* pMenu=GetSystemMenu(FALSE); NH'1rt(w  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Eo%UuSi  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +yzcx3<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 8AT;8I<K  
 return TRUE; // return TRUE unless you set the focus to a control  MKU7fFN.  
} u-m%=2  
'oleB_B  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) B|cA[  
{ \Ut6;  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) wA?@v|,dZ  
 { [^<SLTev  
  CAboutDlg dlgAbout; !8.En8Z<D-  
  dlgAbout.DoModal(); ]EB6+x!G  
 } 12idM*  
 else '@'B>7C#  
 { 7t'(`A 6t/  
  CDialog::OnSysCommand(nID, lParam); n vm^k  
 } mO#I nTO  
} ]#F q>E  
Mv|vRx^b  
void CCaptureDlg::OnPaint() t,RyeS/  
{ sz'p3  
 if (IsIconic()) |<sf:#YzY&  
 { K!GUv{fp  
  CPaintDC dc(this); // device context for painting Z[Wlyb0  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |5W8Q|>%  
  // Center icon in client rectangle Yt -W1vl  
  int cxIcon = GetSystemMetrics(SM_CXICON); @4;&hP2Z:  
  int cyIcon = GetSystemMetrics(SM_CYICON); @gNpJB]V  
  CRect rect; 4[`[mE18.  
  GetClientRect(&rect); 5N\+@grp  
  int x = (rect.Width() - cxIcon + 1) / 2; r,5-XB  
  int y = (rect.Height() - cyIcon + 1) / 2; $4=Ne3 y  
  // Draw the icon [M4xZHd#o  
  dc.DrawIcon(x, y, m_hIcon); sF y]+DB  
 } =(%*LY!Xc  
 else D/Rv&>Jh  
 { &GuF\wJ{7  
  CDialog::OnPaint(); Zb]/nP1P  
 } DB#$~(o  
} g[M]i6h2  
hHpx?9O+!  
HCURSOR CCaptureDlg::OnQueryDragIcon() GE@uO J6H  
{ Qh^R Ax  
 return (HCURSOR) m_hIcon; dgXg kB'  
} ~]&B >q  
B22b&0  
void CCaptureDlg::OnCancel() _74UdD{^o  
{ m=H_?W;  
 if(bTray) >)LAjwhBp  
  DeleteIcon(); u*hH }  
  CDialog::OnCancel(); d<#p %$A4  
} QO2Ut!Y  
0C]4~F x~  
void CCaptureDlg::OnAbout() o5P&JBX<  
{ 3Y`>6A=  
 CAboutDlg dlg; 0 sZwdO  
 dlg.DoModal(); |) O):  
} %l,4=TQ[m  
bhYU5I 9  
void CCaptureDlg::OnBrowse() ha5e(Hj?  
{ G;NB\3 ~X  
 CString str; AP0|z  
 BROWSEINFO bi; AuAT]`  
 char name[MAX_PATH]; B%fU'  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); k52QaMKa~A  
 bi.hwndOwner=GetSafeHwnd(); &3I$8v|!?  
 bi.pszDisplayName=name; c}%es=@  
 bi.lpszTitle="Select folder"; Ah (iE  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; e8{^f]5  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); G]-%AO{K  
 if(idl==NULL) _lP4}9p  
  return; 7,h3V=^)Q  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Qwv '<  
 str.ReleaseBuffer(); 9\AS@SH{^T  
 m_Path=str; wlrIgn%  
 if(str.GetAt(str.GetLength()-1)!='\\') 7H%_sw5S.  
  m_Path+="\\"; uJY.5w  
 UpdateData(FALSE); S 6GMUaR  
} Wab.|\c  
kbhX?; <`  
void CCaptureDlg::SaveBmp() VD/&%O8n  
{ Lyr2(^#:  
 CDC dc; 6 Uw;C84!  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); NI8~QeGah  
 CBitmap bm; KzG_ <<  
 int Width=GetSystemMetrics(SM_CXSCREEN); uf]Y^,2  
 int Height=GetSystemMetrics(SM_CYSCREEN); E5gl^Q?Z  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ,E?4f @|X  
 CDC tdc; "Hht g:  
 tdc.CreateCompatibleDC(&dc); 9 ZGV%Tw  
 CBitmap*pOld=tdc.SelectObject(&bm); aM$=|%9/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); wWTQ6~Y%d  
 tdc.SelectObject(pOld); '0RRFO  
 BITMAP btm; Ff<)4`J  
 bm.GetBitmap(&btm); B'p5M.6d#:  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; b66R}=P l  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |'<vrn  
 BITMAPINFOHEADER bih; xl8#=qmCD  
 bih.biBitCount=btm.bmBitsPixel; y\#o2PVmY  
 bih.biClrImportant=0; nhewDDu  
 bih.biClrUsed=0; j&CZ=?K^c  
 bih.biCompression=0; q`^3ov^</  
 bih.biHeight=btm.bmHeight; Fc'[+L--Q  
 bih.biPlanes=1; \5hw9T&[B  
 bih.biSize=sizeof(BITMAPINFOHEADER); fLNag~  
 bih.biSizeImage=size; o8{<qn|  
 bih.biWidth=btm.bmWidth; W`x)=y]Z  
 bih.biXPelsPerMeter=0; skR,-:"8  
 bih.biYPelsPerMeter=0; RM,'o[%  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); >rw"Rd'  
 static int filecount=0; nLJBq)i  
 CString name; _R74/|  
 name.Format("pict%04d.bmp",filecount++); p+[} Hxx=  
 name=m_Path+name; u s`}  
 BITMAPFILEHEADER bfh; @6b[GekZ<  
 bfh.bfReserved1=bfh.bfReserved2=0; HN68!v}C|  
 bfh.bfType=((WORD)('M'<< 8)|'B'); cy3M^_5B<  
 bfh.bfSize=54+size; fK_~lGY(  
 bfh.bfOffBits=54; ;Iq5|rzDn  
 CFile bf; 6m+W#]^  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ [))JX"a  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); _2OuskL  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); -!TcQzHUs  
  bf.WriteHuge(lpData,size); K/|  
  bf.Close(); .&iN(Bd  
  nCount++; A"4@L*QV  
 } #ZWl=z5aBi  
 GlobalFreePtr(lpData); <KLg0L<W  
 if(nCount==1) .S_QQM}Q  
  m_Number.Format("%d picture captured.",nCount); U5<@<j(@  
 else o/1JO_41  
  m_Number.Format("%d pictures captured.",nCount); G9Qe121m  
  UpdateData(FALSE); }9CrFTbx;  
} tS<h8g_  
XWtiwf'K  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) nU17L6'$  
{ PN &|8_  
 if(pMsg -> message == WM_KEYDOWN) WNF9#oN|oT  
 { $XGtS$  
  if(pMsg -> wParam == VK_ESCAPE) 0T))>.iu#  
   return TRUE; {eR9 ;2!  
  if(pMsg -> wParam == VK_RETURN) lFf XWNb  
   return TRUE; .C= I^  
 } e$|VG* d  
 return CDialog::PreTranslateMessage(pMsg); o&$hYy"<.L  
} c'0 5{C  
2~FPw{]j  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |I^y0Q:K  
{ !SF^a6jT  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ {mSJUK?TKl  
  SaveBmp(); 8lwM{?k$  
  return FALSE; %F J#uQXZ  
} _Adsq8sFW  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ p{.8_#O%S  
 CMenu pop; M#a&\cqC  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); {/ &B!zvl  
 CMenu*pMenu=pop.GetSubMenu(0); h8 =h >W-  
 pMenu->SetDefaultItem(ID_EXITICON); Qra>}e%*  
 CPoint pt; RmOyGSO  
 GetCursorPos(&pt); 4seciz0?  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); f#P_xn&et  
 if(id==ID_EXITICON) x?L hq2  
  DeleteIcon(); O2v.  
 else if(id==ID_EXIT) 5pJ*1pfeo  
  OnCancel(); ]XUSqai  
 return FALSE; l1<?ONB.#  
} GwQn;gkF  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); $]*d#`Sy{%  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) <xlm K(  
 AddIcon(); Mm#[&j[Y  
 return res; gs`> C(  
} [5Y<7DS  
=i6:puf  
void CCaptureDlg::AddIcon() qks|d_   
{ D9-Lg%  
 NOTIFYICONDATA data; =M<z8R  
 data.cbSize=sizeof(NOTIFYICONDATA); zZ,Yfd |W  
 CString tip; )ooWQ-%P  
 tip.LoadString(IDS_ICONTIP); &N\[V-GP2G  
 data.hIcon=GetIcon(0); 0=;YnsY  
 data.hWnd=GetSafeHwnd(); [6R fS  
 strcpy(data.szTip,tip); gX,9Gh  
 data.uCallbackMessage=IDM_SHELL; 2[up+;%Y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &&PgOFD  
 data.uID=98; 254~:eB0  
 Shell_NotifyIcon(NIM_ADD,&data); XDYosC:  
 ShowWindow(SW_HIDE); a)9rs\Is{  
 bTray=TRUE; p4wr`" Zz  
} V`k8j-*s  
r7I B{}>-  
void CCaptureDlg::DeleteIcon() m:{tgcE  
{ &71e5<(dG  
 NOTIFYICONDATA data; (F8AL6  
 data.cbSize=sizeof(NOTIFYICONDATA); {oWsh)[x2  
 data.hWnd=GetSafeHwnd(); 6[?}6gQ  
 data.uID=98; sX:lE^)-z  
 Shell_NotifyIcon(NIM_DELETE,&data); XnXb&@Y  
 ShowWindow(SW_SHOW); !Iq{ 5:  
 SetForegroundWindow(); Wsm`YLYkt!  
 ShowWindow(SW_SHOWNORMAL); bGv4.:)  
 bTray=FALSE; p4> ,Fwy2  
} CLN+I'uX0  
%S#WPD'Y  
void CCaptureDlg::OnChange() Hr }k5'  
{ ow.6!tl0=h  
 RegisterHotkey(); Vk7=7%xW  
} <4mQ*6  
g:gB`8w?  
BOOL CCaptureDlg::RegisterHotkey() ^\wl2  
{ ;&?pd"^<_Z  
 UpdateData(); A/ 0qk  
 UCHAR mask=0; J_ J+cRwq  
 UCHAR key=0; [xdj6W  
 if(m_bControl) \##`pa(8  
  mask|=4; +v15[^F  
 if(m_bAlt)  Q2\  
  mask|=2; $(q8y/,R*-  
 if(m_bShift) G;]:$J  
  mask|=1; _N'75  
  key=Key_Table[m_Key.GetCurSel()]; )|]Z>>%t  
 if(bRegistered){ @2' %o<lF  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); (ZPXdr  
  bRegistered=FALSE; 7ZFJexN]  
 } o4)hxs  
 cMask=mask; TnE+[.Qu  
 cKey=key; ;nB2o-%  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); bPd-D-R  
 return bRegistered; ZBc|438[  
} 8D~x\!(p\  
rt b*n~  
  四、小结 k dU! kj  
@]'S eiNp  
  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。
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