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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: I Z*)  
  "L`BuAB  
  一、实现方法 2xiE#l-V2  
iOCs% J  
  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: p:$kX9mT&  
8z7eL>)  
#pragma data_seg("shareddata") {dP6fr1z  
HHOOK hHook =NULL; //钩子句柄 #G?#ot2o  
UINT nHookCount =0; //挂接的程序数目 BNA1"@9q  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 g.blDOmlc  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 vJct)i  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey M;'GnGFf  
static int KeyCount =0; |,S]EHIy  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 W1Fhx`  
#pragma data_seg() 2A =Y  
,UC|[-J  
  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。 K>LS8,8V  
?~T(Cue>  
  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: S!x;w7j  
#`U?,>2q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR T-GvPl9ZJw  
cKey,UCHAR cMask) 0%;| B  
{ Anpp`>}N  
 BOOL bAdded=FALSE; yS:w>xU @<  
 for(int index=0;index<MAX_KEY;index++){ ( xzruI5P  
  if(hCallWnd[index]==0){ T][c^K*  
   hCallWnd[index]=hWnd; OC-d5P  
   HotKey[index]=cKey; ^_ V0irv  
   HotKeyMask[index]=cMask; [Mc Hl1a  
   bAdded=TRUE; iRcac[uV  
   KeyCount++; #Tag"b`  
   break; xXI WEZA  
  } ]9'F<T= $_  
 } Pg`+Q^^6S  
 return bAdded; Y*A y=@z=y  
} ;14Q@yrZ0  
//删除热键 nRw.82eK.  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) O'^AbO=,  
{  lX/7  
 BOOL bRemoved=FALSE; B-L@ 0gH  
 for(int index=0;index<MAX_KEY;index++){ 'qo(GGC M  
  if(hCallWnd[index]==hWnd){ n ~&ssFC  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [; $:Lr  
    hCallWnd[index]=NULL; y?3u6q++  
    HotKey[index]=0; ) k[XO  
    HotKeyMask[index]=0; W>?aZv  
    bRemoved=TRUE; U UtS me  
    KeyCount--; qz Hsqlof  
    break; .#a7?LUH  
   } QkTU@T6>o  
  } +!`$(  
 } LV0gw"  
 return bRemoved; <&B] p  
} C R't  
$ntC{a>&  
eYjF"Aq  
  DLL中的钩子函数如下: ?v F8 y;Jh  
i!JSEQ_8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )[&j&AI  
{ /J c^XWf  
 BOOL bProcessed=FALSE; zH~g5xgh  
 if(HC_ACTION==nCode) " ;8kKR  
 { LS# _K-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开  s-&i!d  
   switch(wParam) QZO<'q`L  
   {  eISHV.QV  
    case VK_MENU: lD _iIe~c  
     MaskBits&=~ALTBIT; xs "\c7pC  
     break; *l0i}"T^_  
    case VK_CONTROL: >%_i#|dE>  
     MaskBits&=~CTRLBIT; f_hG2Sk  
     break; eB,@oo%  
    case VK_SHIFT: t)(>E'X x  
     MaskBits&=~SHIFTBIT; Ur""&@  
     break; +K;%sAZy  
    default: //judge the key and send message `sRys oW  
     break; Zyz)`>cB  
   } {w99~?  
   for(int index=0;index<MAX_KEY;index++){ 1JI7P?\B  
    if(hCallWnd[index]==NULL) vDc&m  
     continue; Fy_~~nI0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =_2(S6~  
    { )hK;27m4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); IueI7A  
     bProcessed=TRUE; f-}_  
    } g%4=T~  
   } )f%Q7  
  } -N2m|%B  
  else if((lParam&0xc000ffff)==1){ //有键按下 6" . v6  
   switch(wParam) P$`k* v  
   { l W Lj==  
    case VK_MENU: elP#s5l4  
     MaskBits|=ALTBIT; }iB>3|\  
     break; M;@/697G  
    case VK_CONTROL: TiI3<.a!  
     MaskBits|=CTRLBIT; \Q,5Ne'o  
     break; (G{2ec:?  
    case VK_SHIFT: ? ~_h3bHH  
     MaskBits|=SHIFTBIT; [>kzQYT[  
     break; :HN\A4=kc(  
    default: //judge the key and send message .OF2O}  
     break; M j |"+(  
   } -/6Ms%O  
   for(int index=0;index<MAX_KEY;index++){ {_J1m&/  
    if(hCallWnd[index]==NULL) Y2y = P  
     continue; JB!KOzw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =Xb:.  
    { |DoD.?v  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); dxWG+S  
     bProcessed=TRUE; a[V4EX1E  
    } TbhsOf!  
   } 6C*4' P9>  
  } eP|hxqM&9  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 +}!FP3KgT  
   for(int index=0;index<MAX_KEY;index++){ #TY[\$BHs  
    if(hCallWnd[index]==NULL) \F),SL  
     continue; CLY>M`%?+p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) zzyD'n7D  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); uB3Yl =P  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 .?-]+ -J?`  
   } ::G0v  
  } >]l7AZ:,  
 } EcmyY,w  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); QU^?a~r  
} Q!}LtR$  
H-Or  
  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: {DGnh1  
CKRnkTTiV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 83YQ c  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Je;HAhL  
zRF +D+  
  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: ao)8ie  
X0gWTs  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) HpTX6}^  
{ &$E.rgtg  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Sc3B*.  
 { &dI;o$t  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ?$rH yI  
  SaveBmp(); +^@6{1  
  return FALSE; u}IQ)Ma  
 } BpZ17"\z  
 …… //其它处理及默认处理 !mRDzr7  
} N"o+;yR  
v?(9ZY]  
^G]H9qY- e  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 cvl1 X"  
/2e,,)4g  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 LuW^Ga"E  
?>o|H-R~5Z  
  二、编程步骤 b&Go'C{p  
/:@X<  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; F {T\UX  
2XGbqZj  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; {oc7Chv=/H  
0ud>oh4WPR  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ?e+$?8l[3  
Sk&l8"  
  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; dX:#KdK  
@Tg +Kt  
  5、 添加代码,编译运行程序。 `SSUQ#@  
/C)FS?=  
三、程序代码 JqYt^,,Q:  
PFnq:G^L  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ^L;k  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9,zM.g9Qv  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 5!)_" u3  
#if _MSC_VER > 1000 =)Q0=!%-  
#pragma once mMRdnf!Uid  
#endif // _MSC_VER > 1000 =3?"s(9  
#ifndef __AFXWIN_H__ @ag*zl  
#error include 'stdafx.h' before including this file for PCH fnm:Wa|,%|  
#endif trC+Etc   
#include "resource.h" // main symbols }8cX0mZ1j  
class CHookApp : public CWinApp PC}m.tE  
{ SQd`xbIuL  
 public: iNAaTU  
  CHookApp(); HfgK0wIi  
  // Overrides Bpw<{U  
  // ClassWizard generated virtual function overrides ,"W.A  
  //{{AFX_VIRTUAL(CHookApp) X}gnO83  
 public: 4C{3>BE  
  virtual BOOL InitInstance(); edy6WzxBcm  
  virtual int ExitInstance(); oPA [vY  
  //}}AFX_VIRTUAL fCxF3m(O  
  //{{AFX_MSG(CHookApp) *PVv=SU  
  // NOTE - the ClassWizard will add and remove member functions here. +w pe<T  
  // DO NOT EDIT what you see in these blocks of generated code ! dECH/vJ^  
  //}}AFX_MSG HGjGV]N5  
  DECLARE_MESSAGE_MAP() : 'LG%E:b  
}; =wy3h0k^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ^."HD(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c_r&)8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /Aq):T T  
BOOL InitHotkey(); {? dW-  
BOOL UnInit(); `i)&nW)R  
#endif |ozlaj  
uJ!yM;{+  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. wzRIvm{  
#include "stdafx.h" Q5s?/r  
#include "hook.h" 9w! G  
#include <windowsx.h> S(f V ,;Z  
#ifdef _DEBUG 8?7gyp!k_f  
#define new DEBUG_NEW :>t? ^r(  
#undef THIS_FILE ]'/ZSy,  
static char THIS_FILE[] = __FILE__; ~t~5ctJ@  
#endif mrfc.{`[  
#define MAX_KEY 100 >%D=#}8l@  
#define CTRLBIT 0x04 An%V>a-[  
#define ALTBIT 0x02 ~?c}=XL-  
#define SHIFTBIT 0x01 UUt631  
#pragma data_seg("shareddata") p3NTI/-  
HHOOK hHook =NULL; -)Y?1w  
UINT nHookCount =0; %Jpb&CEY  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey =!`\=!y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT >5jHgs#  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey [}OL@num  
static int KeyCount =0; ;#$zHR  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 92k}ON  
#pragma data_seg() -~HlME *~f  
HINSTANCE hins; [[[QBplJ  
void VerifyWindow(); {:3XP<hqN  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) `f2m5qTP%  
//{{AFX_MSG_MAP(CHookApp) U "qO&;m  
// NOTE - the ClassWizard will add and remove mapping macros here. ] PnE%  
// DO NOT EDIT what you see in these blocks of generated code! :-f"+v  
//}}AFX_MSG_MAP '7<@(HO  
END_MESSAGE_MAP() ,Wp0,>!  
!\NKu1ta  
CHookApp::CHookApp() M]>JI'8  
{ N -]m <z>  
 // TODO: add construction code here, y{eZrX|  
 // Place all significant initialization in InitInstance e<p_u)m  
} S %"7`xl  
)pVxp]EI  
CHookApp theApp; iK"j@1|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `f^`i~c\  
{ n]B)\D+V^  
 BOOL bProcessed=FALSE; sv^; nOAc  
 if(HC_ACTION==nCode) mP)<;gm,  
 { pr-{/6j6  
  if((lParam&0xc0000000)==0xc0000000){// Key up QsmG(1=  
   switch(wParam) L#e|t0'#  
   { .~5cNu'#m  
    case VK_MENU: K6 ,5C0  
     MaskBits&=~ALTBIT; Mdh(Mp(w  
     break; _OF 8D  
    case VK_CONTROL: 2#A u6BvX  
     MaskBits&=~CTRLBIT; ~X;(m<f2  
     break; #oYX0wvl  
    case VK_SHIFT: nDvny0^a  
     MaskBits&=~SHIFTBIT; >NwrJSx  
     break; u%O^hcfb  
    default: //judge the key and send message fxLhVJ"b  
     break; `,(1'  
   } %;9e h'  
   for(int index=0;index<MAX_KEY;index++){ ZUyM:$  
    if(hCallWnd[index]==NULL) &-+&`h|s  
     continue; |k'I?:'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jkNZv. )p  
    { WII_s|YSt%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 0EXAdRR  
     bProcessed=TRUE; mId{f  
    } [,5clR=F  
   } "VWxHRVg4M  
  } q<JI!n1O  
  else if((lParam&0xc000ffff)==1){ //Key down /$rS0@p  
   switch(wParam) (6\A"jey\x  
   { qc\o>$-:`  
    case VK_MENU: B>47Ic  
     MaskBits|=ALTBIT; ? =IbiT  
     break; :B- ,*@EU  
    case VK_CONTROL: q0y?$XS  
     MaskBits|=CTRLBIT; q@(N 38D  
     break; TF^]^XS'  
    case VK_SHIFT: ]-.Q9cjc$q  
     MaskBits|=SHIFTBIT; nbpN+a%  
     break; of& vQ  
    default: //judge the key and send message ,iPkx(  
     break; kd \G>  
   } `hlyN]L  
   for(int index=0;index<MAX_KEY;index++) C-6+ZIk4  
   { 9 I RE@c  
    if(hCallWnd[index]==NULL) iCx'`^HnP  
     continue; {8jG6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T  |j^  
    { kLD)<D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); q>omCk%h  
     bProcessed=TRUE; nMc-kyl{  
    } [1vrv(u>  
   } &P {%C5?{  
  } 8'cDK[L  
  if(!bProcessed){ oW+R:2I~O  
   for(int index=0;index<MAX_KEY;index++){ orU4{.e  
    if(hCallWnd[index]==NULL) Hh@mIusj  
     continue; rfPJBD{Ve  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) E>V8|Hz;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Ta[}k/zW  
   } L,kF]  
  } N]=.I   
 } aVtwpkgZ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); OQsH,'  
} 1%=,J'AH  
)US) -\^  
BOOL InitHotkey() a,tP.Xsl  
{ gh 0\9;h  
 if(hHook!=NULL){ T@S+5(  
  nHookCount++; 7PvuKAv?k  
  return TRUE; ,,iQG' *  
 } g{a0,B/j  
 else W.CIyGK  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  :D/R  
  if(hHook!=NULL) FQ4rA 4  
   nHookCount++; 3~S~)quwP  
  return (hHook!=NULL); @O(\ TIg  
} 7vWB=r>5@  
BOOL UnInit() FJ[(dGKeE  
{ (C:rH  
 if(nHookCount>1){ qj/P4*6E  
  nHookCount--; /;>EyWW  
  return TRUE; lk'RWy"pw  
 } Ar$LA"vu4  
 BOOL unhooked = UnhookWindowsHookEx(hHook); l%:_#1?isf  
 if(unhooked==TRUE){ }l2JXf55  
  nHookCount=0; ]Lh\[@#1f  
  hHook=NULL; X3>(K1  
 } r9U1O@c  
 return unhooked; u J$"2<O  
} aD:+,MZ  
XU54skN  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) n#R!`*[  
{ +l#2u#e  
 BOOL bAdded=FALSE; G@;aqe[dB  
 for(int index=0;index<MAX_KEY;index++){ Mu%'cwp$  
  if(hCallWnd[index]==0){ 8 , =$>@u  
   hCallWnd[index]=hWnd; o]j*  
   HotKey[index]=cKey; $OO[C={v[  
   HotKeyMask[index]=cMask; ppYz~ {"r  
   bAdded=TRUE; Il642#Gh  
   KeyCount++; D'&L wU,o  
   break; (AS%P?  
  } 4>W`XH  
 } MoA{ /{  
 return bAdded; e'`oisJU?q  
} Y `{U45  
q}!4b'z^  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6IX!9I\sT  
{ 7-dwr?j7  
 BOOL bRemoved=FALSE; BAhC-;B#R  
 for(int index=0;index<MAX_KEY;index++){ M Q6Y^,B  
  if(hCallWnd[index]==hWnd){ ,y>Na{@Y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ @K/I a!Lw  
    hCallWnd[index]=NULL; YJy*OS_&  
    HotKey[index]=0; 9NT;^K^ I  
    HotKeyMask[index]=0; = `^jz}  
    bRemoved=TRUE; LWI~m2  
    KeyCount--; 1mX*0>  
    break; DHAWUS6  
   } W)#`4a^xj7  
  } qkIU>b,B  
 } u!i5Q  
 return bRemoved; nqBu C  
} cC4T3]4l'  
@K9T )p]  
void VerifyWindow() R+K[/AA  
{ c&++[  
 for(int i=0;i<MAX_KEY;i++){ -  -G1H  
  if(hCallWnd!=NULL){ ?@1'WD t  
   if(!IsWindow(hCallWnd)){ nR7\ o(!  
    hCallWnd=NULL; wLtTC4D  
    HotKey=0; ca =e_sg  
    HotKeyMask=0; (5> ibe  
    KeyCount--; Ro<kp8  
   } q}5A^QX  
  } K(gj6SrjV  
 } V5B-S.i@  
} o(P:f)B  
Nj0)/)<r+  
BOOL CHookApp::InitInstance() =@2V#X]M*  
{ _ ^{Ep/ME=  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [R4x[36Zp  
 hins=AfxGetInstanceHandle();  qR qy  
 InitHotkey(); S F>D:$a  
 return CWinApp::InitInstance(); Ct)MvZ  
} CWp1)% 0=  
W[Bu&?h$  
int CHookApp::ExitInstance() %K"%Qm=Tl  
{ CeTr%j  
 VerifyWindow(); G+uiZ (p>  
 UnInit(); [.X%:H+  
 return CWinApp::ExitInstance(); &._!)al  
} }&DB5M  
%v[ Kk-d  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file hZ<btN .y5  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) vC:b?0s#(  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ d|]O<]CG_  
#if _MSC_VER > 1000 4_+Pv6  
#pragma once [+g@@\X4  
#endif // _MSC_VER > 1000 }4SSo)Uv/  
jJZsBOW[8  
class CCaptureDlg : public CDialog pFTlhj)1  
{ 7 Zt\G-QV  
 // Construction lGUV(D  
 public: R*Z]  
  BOOL bTray; AwU c{h l<  
  BOOL bRegistered; >&QH{!(  
  BOOL RegisterHotkey(); PuCDsojclh  
  UCHAR cKey; *ldMr{s<R  
  UCHAR cMask; v Q"s  
  void DeleteIcon(); KC:4  
  void AddIcon();  YX`=M  
  UINT nCount; O}_a3>1DY  
  void SaveBmp(); _AYC|R|  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ]"Y%M'  
  // Dialog Data ~9r!m5ws  
  //{{AFX_DATA(CCaptureDlg) [!@oRK=~  
  enum { IDD = IDD_CAPTURE_DIALOG }; >}b6J7_  
  CComboBox m_Key; M J,ZXJXs  
  BOOL m_bControl; {Y91vXTz7  
  BOOL m_bAlt; T_?nd T2  
  BOOL m_bShift; .3<IOtD=  
  CString m_Path; .l+~)$  
  CString m_Number; ZuvPDW%  
  //}}AFX_DATA $[iT~B$  
  // ClassWizard generated virtual function overrides dAr)%RZ  
  //{{AFX_VIRTUAL(CCaptureDlg) ZQ~myqx,+L  
 public: R pI<]1  
  virtual BOOL PreTranslateMessage(MSG* pMsg); {M r~%y4  
 protected: [OZ=iz.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C`n9/[,#  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); F|?'9s*;6G  
  //}}AFX_VIRTUAL F`0c?)  
  // Implementation +K%pxuVh  
 protected: f{Fe+iPc  
  HICON m_hIcon; qC1U&b#MVx  
  // Generated message map functions ;DD>k bd  
  //{{AFX_MSG(CCaptureDlg) /Pn.)Lxfl  
  virtual BOOL OnInitDialog(); sQ}%7BMK  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 3`k[!!   
  afx_msg void OnPaint(); 8.CKH4h  
  afx_msg HCURSOR OnQueryDragIcon(); yYToiW *  
  virtual void OnCancel(); ')5L_$  
  afx_msg void OnAbout(); #_?TIY:h  
  afx_msg void OnBrowse(); jefNiEE[  
  afx_msg void OnChange(); z0 2}&^Zzk  
 //}}AFX_MSG H 5U x.]y  
 DECLARE_MESSAGE_MAP() 8Y\OCwO  
}; kxm:g)`=[  
#endif IAP/G5'Q  
O:;OR'N9  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file o)tKH@`vE  
#include "stdafx.h" q*[!>\ Z8  
#include "Capture.h" ]D LZ&5pv  
#include "CaptureDlg.h" K lli$40  
#include <windowsx.h> K[uY+!'1  
#pragma comment(lib,"hook.lib") j9URl$T:  
#ifdef _DEBUG X<~k =qwA  
#define new DEBUG_NEW N^ h |h  
#undef THIS_FILE SqXy;S@  
static char THIS_FILE[] = __FILE__; <E>7>ZL  
#endif K/vxzHSl  
#define IDM_SHELL WM_USER+1 eC6>yD6D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m7r j>X Y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); GS ;HtUQ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -uA3Y  
class CAboutDlg : public CDialog #y=ZP:{:t  
{ |*^8~u3J"  
 public: @up&q  
  CAboutDlg(); ;w`sz.  
  // Dialog Data I %|@3=Yc  
  //{{AFX_DATA(CAboutDlg) 9ZDVy7m\i-  
  enum { IDD = IDD_ABOUTBOX }; nnt8 sf@\  
  //}}AFX_DATA #K=b%;>  
  // ClassWizard generated virtual function overrides c ]>DI&$;J  
  //{{AFX_VIRTUAL(CAboutDlg) {y,nFxLq  
 protected: XkPv*%Er8  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8P,l>HA  
  //}}AFX_VIRTUAL F:M>z=  
  // Implementation 2E$^_YT C  
 protected: 5>k>L*5J  
  //{{AFX_MSG(CAboutDlg) )]%e  
  //}}AFX_MSG [34zh="o  
  DECLARE_MESSAGE_MAP() :KEq<fEI  
}; 3A-*vaySV  
sYGR-:K  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) a9[mZVMgUK  
{ gU l1CH&  
 //{{AFX_DATA_INIT(CAboutDlg) `-VG ?J  
 //}}AFX_DATA_INIT NW z9C=y  
} :qxm !P  
B@ -|b  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;0IvF#SJ(.  
{ L e*`r2  
 CDialog::DoDataExchange(pDX); .iFViVZC  
 //{{AFX_DATA_MAP(CAboutDlg) 5XDgs|8  
 //}}AFX_DATA_MAP -*?p F_*w  
} 'X9AG6K1  
E W`W~h[  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) K[kds`  
 //{{AFX_MSG_MAP(CAboutDlg) 6DB0ni  
 // No message handlers 7 0_}S*T  
 //}}AFX_MSG_MAP '=VH6@vZ_'  
END_MESSAGE_MAP() z&O#v9.NE|  
%NNj9Bl<VV  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ^w.]Hd 2  
: CDialog(CCaptureDlg::IDD, pParent) 7%e1cI  
{ Uo~T'mA"  
 //{{AFX_DATA_INIT(CCaptureDlg) kd yAl,  
  m_bControl = FALSE; mjbTy"}"  
  m_bAlt = FALSE; xA92 C  
  m_bShift = FALSE; 6,X+1EXY  
  m_Path = _T("c:\\"); 'xIyGDe  
  m_Number = _T("0 picture captured."); c S4DN  
  nCount=0; x|8^i6xB  
  bRegistered=FALSE; .46#`4av  
  bTray=FALSE; vv+km+  
 //}}AFX_DATA_INIT }MP>]8Aq  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]Ko^G_Rm  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); )IHG6}<  
} ["u#{>(X  
58::h. :  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ~(P&g7u  
{ 09'oz*v{#  
 CDialog::DoDataExchange(pDX); 30s; }  
 //{{AFX_DATA_MAP(CCaptureDlg) D93gH1z  
  DDX_Control(pDX, IDC_KEY, m_Key); =J](.78  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Q^L) Vp"  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 3f"C!l]Xu  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); + ~ "5!  
  DDX_Text(pDX, IDC_PATH, m_Path); \/ErPi=g  
  DDX_Text(pDX, IDC_NUMBER, m_Number); AotCX7T2T  
 //}}AFX_DATA_MAP #.H}r6jqs  
} X3<K 1/<  
P;73Hr[E#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) h$>wv`  
//{{AFX_MSG_MAP(CCaptureDlg) onwjn+"&  
 ON_WM_SYSCOMMAND() l-<`m#/v  
 ON_WM_PAINT() Sm)u9  
 ON_WM_QUERYDRAGICON() V7EQ4Om:It  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) TN\|fzj  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) KFU%DU G  
 ON_BN_CLICKED(ID_CHANGE, OnChange) TkRmV6'w  
//}}AFX_MSG_MAP ziiwxx_  
END_MESSAGE_MAP() \9`#]#1bx5  
-\4zwIH  
BOOL CCaptureDlg::OnInitDialog() Br!9x {q*  
{ k2r3dO@q  
 CDialog::OnInitDialog(); Q,gLi\siI  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 4 j X3lq|  
 ASSERT(IDM_ABOUTBOX < 0xF000); /,2rjJ#b  
 CMenu* pSysMenu = GetSystemMenu(FALSE); z8"7u /4v{  
 if (pSysMenu != NULL) .fp&MgiQ  
 { I`T1Pll  
  CString strAboutMenu; XRxj  W  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Wpr ,j N8b  
  if (!strAboutMenu.IsEmpty()) BEUK}T K4  
  { BRzfic :e  
   pSysMenu->AppendMenu(MF_SEPARATOR); :5b0np!  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); GSi>l,y'  
  } j/KO|iNL2  
 } 6@V~0DG  
 SetIcon(m_hIcon, TRUE); // Set big icon /&^W#U$4  
 SetIcon(m_hIcon, FALSE); // Set small icon "g0(I8  
 m_Key.SetCurSel(0); cE\>f8 I  
 RegisterHotkey(); g<wRN#B  
 CMenu* pMenu=GetSystemMenu(FALSE); <CZgQ\Mt  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); wNYg$d0M  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); T^:fn-S}=  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); > ' i  
 return TRUE; // return TRUE unless you set the focus to a control ok{!+VCB5  
} %%JMb=!%2  
fQdK]rLj  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Zsx3/}  
{ GpI!J}~m  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) b~w=v_[(I  
 { iM]o"qOQm  
  CAboutDlg dlgAbout; _>yoX  
  dlgAbout.DoModal(); (Un_!)  
 } 'e!J06  
 else _S`o1^Ad  
 { .i Hn5SGA  
  CDialog::OnSysCommand(nID, lParam); ._PzYE|m2  
 } :O= \<t  
} :j^FJ@2_  
`5~3G2T  
void CCaptureDlg::OnPaint() AUe# RP  
{ n6<V+G)T  
 if (IsIconic()) .(CP. d  
 { {{yZ@>o6  
  CPaintDC dc(this); // device context for painting Zd:Taieh@  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); `bjizS'^  
  // Center icon in client rectangle bm% $86  
  int cxIcon = GetSystemMetrics(SM_CXICON); x[ 3A+  
  int cyIcon = GetSystemMetrics(SM_CYICON); DA&?e~L&H  
  CRect rect; m3<+yz$!r  
  GetClientRect(&rect); 36.N>G,  
  int x = (rect.Width() - cxIcon + 1) / 2; Iw<i@=V  
  int y = (rect.Height() - cyIcon + 1) / 2; C3NdE_E  
  // Draw the icon ^-z=`>SrS"  
  dc.DrawIcon(x, y, m_hIcon); VVP:w%yW  
 } ]X Z-o>+ ,  
 else {gbn/{  
 { 7R!5,Js+  
  CDialog::OnPaint(); ={>Lrig:l  
 } svf|\p>]H  
} ,\2:/>2  
M-V&X&?j  
HCURSOR CCaptureDlg::OnQueryDragIcon() 9o*,P,j'}  
{ D,qu-k[jMI  
 return (HCURSOR) m_hIcon; >9e(.6&2XZ  
} 1K,1X(0rL8  
}v:jncp  
void CCaptureDlg::OnCancel() . \   
{ kVK/9dy-F  
 if(bTray) 2_vbT!_  
  DeleteIcon(); U8qtwA9t  
  CDialog::OnCancel(); evkH05+;W  
} w }Uhd ,  
+6wiOHB`  
void CCaptureDlg::OnAbout() Wjhvxk  
{ &nBa=Enf  
 CAboutDlg dlg; 9$`lIy@B  
 dlg.DoModal(); H"ZZ.^"5FV  
} *HEuorl  
>D201&*G%  
void CCaptureDlg::OnBrowse() L|bwZ,M=}?  
{ q[`j`8YY!R  
 CString str; fd-q3 _f  
 BROWSEINFO bi; OO[F E3F  
 char name[MAX_PATH]; -'~ LjA(  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); <! )**  
 bi.hwndOwner=GetSafeHwnd(); M%jPH  
 bi.pszDisplayName=name; Y"A/^]  
 bi.lpszTitle="Select folder"; UfS%71l.$  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; p+)YTzzc  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); #9K-7je;j  
 if(idl==NULL) ME'|saP  
  return; _6 ay-u  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); RV@*c4KvO+  
 str.ReleaseBuffer(); lz1 wO5%h  
 m_Path=str; "*G.EiLq  
 if(str.GetAt(str.GetLength()-1)!='\\') mZd , 9  
  m_Path+="\\"; Kq i4hK  
 UpdateData(FALSE); AU2i%Q!  
} cM&{+el  
E[Cb|E  
void CCaptureDlg::SaveBmp() |4'Y/re  
{ Y nLErJ  
 CDC dc; \hCH>*x<  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); +TXX$)3%  
 CBitmap bm; KtNY_&xd  
 int Width=GetSystemMetrics(SM_CXSCREEN); )7h$G-fe  
 int Height=GetSystemMetrics(SM_CYSCREEN); rRFhGQq1m  
 bm.CreateCompatibleBitmap(&dc,Width,Height); D_vbSF)  
 CDC tdc; B(M6@1m_  
 tdc.CreateCompatibleDC(&dc); ..rOsg{  
 CBitmap*pOld=tdc.SelectObject(&bm); "~'b  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); g)-bW+]q  
 tdc.SelectObject(pOld); _3ZYtmn.  
 BITMAP btm; >$4d7.^hb/  
 bm.GetBitmap(&btm); !"Oh3 6  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; :0h_K  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); G37U6PuZi  
 BITMAPINFOHEADER bih; `]%|f  
 bih.biBitCount=btm.bmBitsPixel; i>(e}<i  
 bih.biClrImportant=0; wiiCd  
 bih.biClrUsed=0; ti#7(^j  
 bih.biCompression=0; -\C!I  
 bih.biHeight=btm.bmHeight; i-6 Z"b{  
 bih.biPlanes=1; I'LnI*  
 bih.biSize=sizeof(BITMAPINFOHEADER); 1')%`~  
 bih.biSizeImage=size; '3g[]M@M  
 bih.biWidth=btm.bmWidth; "s{5O>  
 bih.biXPelsPerMeter=0; <u2}i<#  
 bih.biYPelsPerMeter=0; NU0g07"  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); '*3h!lW1.  
 static int filecount=0; kBffF@{  
 CString name; j:VbrR  
 name.Format("pict%04d.bmp",filecount++); b9l;a+]d  
 name=m_Path+name; fZoHf\B]{  
 BITMAPFILEHEADER bfh; ^0 -:G6H  
 bfh.bfReserved1=bfh.bfReserved2=0; :5{wf Am  
 bfh.bfType=((WORD)('M'<< 8)|'B'); _fKou2$yz  
 bfh.bfSize=54+size; MjU6/pO}L  
 bfh.bfOffBits=54; _ jsK}- \  
 CFile bf; .hifsB~  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Om5Y|v"*  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); s=;uc] 9g  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); u?}(P_9  
  bf.WriteHuge(lpData,size); b}"N`,0dO  
  bf.Close(); }|pwz   
  nCount++; R#I0|;q4|p  
 } 5rU[ T ir  
 GlobalFreePtr(lpData); OOo3G~2r  
 if(nCount==1) #~ )IJ  
  m_Number.Format("%d picture captured.",nCount); V{!J-nO  
 else *+#8mA(  
  m_Number.Format("%d pictures captured.",nCount); ,=[?yJy  
  UpdateData(FALSE); `9BROZnq  
} o6uJyCO  
~GZY5HF  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ):[7E(F=  
{ o{y9r{~A  
 if(pMsg -> message == WM_KEYDOWN)  z62;cv  
 { j3{D^|0bP  
  if(pMsg -> wParam == VK_ESCAPE) yjF1}SQ  
   return TRUE; 7Mg=b%IYs  
  if(pMsg -> wParam == VK_RETURN) ci?qT,&  
   return TRUE; 0|{u{w@!`  
 }  @fl-3q  
 return CDialog::PreTranslateMessage(pMsg); ~ Q.7VDz  
} xwq+j "  
=ACVE;L?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 24z< gO  
{ & tg&5_  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ FG.em  
  SaveBmp(); F9,DrB,B{  
  return FALSE; ,Y/ g2 4R  
} !:q/Ye3.  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ,X`)ct  
 CMenu pop; 6">+ ~ G  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,g2ij  
 CMenu*pMenu=pop.GetSubMenu(0); xLK<W"%0  
 pMenu->SetDefaultItem(ID_EXITICON); V3^&oe%  
 CPoint pt; ,F,X ,  
 GetCursorPos(&pt); m}7iTDJR9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); hhCrUn"  
 if(id==ID_EXITICON) EK6:~  
  DeleteIcon(); Bu#VMk chJ  
 else if(id==ID_EXIT) wAf\|{Vn  
  OnCancel(); qVH1}9_  
 return FALSE; .\)U@L~  
} &m-PC(W+  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); E87Ww,z8  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) tMf}   
 AddIcon(); 3=aQG'B  
 return res; Mygf T[_  
} jIC_[  
%C| n9*  
void CCaptureDlg::AddIcon() '"SEw w  
{ l`#4KCL(  
 NOTIFYICONDATA data; pKpUXfQu  
 data.cbSize=sizeof(NOTIFYICONDATA); X-K=!pET  
 CString tip; w n/_}]T  
 tip.LoadString(IDS_ICONTIP); M l Jo`d  
 data.hIcon=GetIcon(0); g?z/2zKR  
 data.hWnd=GetSafeHwnd(); 1v.c 6~  
 strcpy(data.szTip,tip); Rwz0poG`WG  
 data.uCallbackMessage=IDM_SHELL; *U&0<{|T  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; :~Wrf8 UQ  
 data.uID=98; L^@'q6*}  
 Shell_NotifyIcon(NIM_ADD,&data); oX30VfT  
 ShowWindow(SW_HIDE); 5z7U1:  
 bTray=TRUE; gOSJM1Mr3  
} ME46V6[LX]  
=P't(<  
void CCaptureDlg::DeleteIcon()  zv0l,-o  
{ Yc_8r+;(  
 NOTIFYICONDATA data; p<2L.\6"  
 data.cbSize=sizeof(NOTIFYICONDATA); ,,%i;  
 data.hWnd=GetSafeHwnd(); gQ Fjr_IS#  
 data.uID=98; 7%Gwc?[x  
 Shell_NotifyIcon(NIM_DELETE,&data); Xg|B \ \  
 ShowWindow(SW_SHOW); J:CXW%\ <q  
 SetForegroundWindow(); 1OCeN%4]Qk  
 ShowWindow(SW_SHOWNORMAL); o<BOYrS  
 bTray=FALSE; ?!A7rb/tj  
} YIoQL}pX  
Z}mLLf E  
void CCaptureDlg::OnChange() #U! _U+K  
{ ,(d) Qg  
 RegisterHotkey(); Wbr|_W  
} !t$'AoVBq  
r`W)0oxD  
BOOL CCaptureDlg::RegisterHotkey() EofymAi%  
{ >,gg5<F-E  
 UpdateData(); x@P y>f2  
 UCHAR mask=0; $PTP/^  
 UCHAR key=0; m0ER@BXRn  
 if(m_bControl) {o_X`rgrL  
  mask|=4; _=_Px@<Q  
 if(m_bAlt) ,k )w6)  
  mask|=2; U}yW<#$+  
 if(m_bShift) I`-8Air5f  
  mask|=1; 5na~@-9p  
  key=Key_Table[m_Key.GetCurSel()]; Uc7mOa}4  
 if(bRegistered){ S?1AFI9{   
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); xST8|H  
  bRegistered=FALSE; 5D\f8L  
 } ?pr9f5  
 cMask=mask; IUE~_7  
 cKey=key; j9eTCJqB  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -+(jq>t  
 return bRegistered; [#-b8Cu  
} @L<*9sLWh  
7Ri46Tkt  
  四、小结 Xe6w|  
~ {E'@MU  
  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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