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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: 47S1mxur  
  ld*W\  
  一、实现方法 q mJ#cmN  
cSbyVC[r  
  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: @u@ N&{b5"  
,, 8hU7P  
#pragma data_seg("shareddata") eo#2n8I>=1  
HHOOK hHook =NULL; //钩子句柄 I_?+;<n  
UINT nHookCount =0; //挂接的程序数目 6]%SSq&  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Z<P?P`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 m`;dFL7"E  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ":qhO0  
static int KeyCount =0; Zqo  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 B//2R)HS  
#pragma data_seg() aXv[~  
Rcn6puZt  
  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。 _Wb3,E a=  
+#;t.&\80N  
  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: =,MX%-2  
pB;U*lt  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR J!\Cs1 !f  
cKey,UCHAR cMask) !iNN6-v%  
{ `@_j Do  
 BOOL bAdded=FALSE; +.czj,Sq  
 for(int index=0;index<MAX_KEY;index++){ (BT{\|,V_m  
  if(hCallWnd[index]==0){ vtByCu5  
   hCallWnd[index]=hWnd; b] EC+.  
   HotKey[index]=cKey; K/flg|uZ/V  
   HotKeyMask[index]=cMask; [-5l=j r  
   bAdded=TRUE; T^Lg+g+I  
   KeyCount++; 6"o,)e/z  
   break; ln1QY"g  
  } 9}*Pb6  
 } pdw;SIoC  
 return bAdded; S5+W<Qs  
} (kYwD  
//删除热键 -:V0pb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <rKfL`8p  
{ 4[XiD*  *  
 BOOL bRemoved=FALSE;  LBIsj}e  
 for(int index=0;index<MAX_KEY;index++){ Ya*<me>`  
  if(hCallWnd[index]==hWnd){ BJDSk#!J!{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ FJ+n- \  
    hCallWnd[index]=NULL; n:8<Ijrh  
    HotKey[index]=0; .T\jEH8E  
    HotKeyMask[index]=0; BO%aCK&  
    bRemoved=TRUE; /8O;Q~a  
    KeyCount--; :z^,>So:  
    break; |?gO@?KDZ  
   } PAy/"R9DT-  
  } xTGdh  
 } 7Eo;TNbb  
 return bRemoved; PR2;+i3  
} lD-HQd  
F&_b[xso7  
lc(}[Z/|V  
  DLL中的钩子函数如下: $/FL)m8.3  
0F-%C>&g  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "nA~/t=  
{ <HfmNhI85(  
 BOOL bProcessed=FALSE; K[^BRn  
 if(HC_ACTION==nCode) %jh gKq  
 { %0_}usrsk  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 m85H x1!p.  
   switch(wParam) |ERf3  
   {  x>Gx yVE  
    case VK_MENU: w{"ro~9o  
     MaskBits&=~ALTBIT; "KKw\i  
     break; j2`%sBo  
    case VK_CONTROL: 5_[we1$P  
     MaskBits&=~CTRLBIT; r!&}4lHYi  
     break; % pQi}x  
    case VK_SHIFT: %hVI*p3  
     MaskBits&=~SHIFTBIT; 9CFh'>}$  
     break; $2>"2*,04  
    default: //judge the key and send message nU,~*Us  
     break; 0]Qk*u<  
   } h1+y.4  
   for(int index=0;index<MAX_KEY;index++){ 'j$n;3  
    if(hCallWnd[index]==NULL) dfMi]rs!<  
     continue; f/vsf&^O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #A 7|=E  
    { ld[BiP`B2V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !7n`-#)  
     bProcessed=TRUE; Sv\399(  
    } -u^f;4|u  
   } 4Cp)!Bq?/  
  } )S^[b2P]y_  
  else if((lParam&0xc000ffff)==1){ //有键按下 [{.9#cQ "  
   switch(wParam) K6 c[W%Va  
   { C#@-uo2  
    case VK_MENU: 9;ie[sU:u  
     MaskBits|=ALTBIT; ]2rC n};  
     break; M~ g{}_ 0Z  
    case VK_CONTROL: }oL l? L  
     MaskBits|=CTRLBIT; zsr;37  
     break; `RyH~4\;  
    case VK_SHIFT: *YP:-  
     MaskBits|=SHIFTBIT; I_is3y0  
     break; gTk*v0WBm  
    default: //judge the key and send message L}VQc9"gc  
     break; nq:'jdY5|  
   } %+oV-o\ #A  
   for(int index=0;index<MAX_KEY;index++){ F- {hXM  
    if(hCallWnd[index]==NULL) kC iOcl*$  
     continue; W?yGV{#V(=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &sooXKlv|  
    { qT^0 %O:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4U*CfdZZ  
     bProcessed=TRUE; x$) E^|A+  
    } ,[[Xo;q  
   } NBD1k;  
  } k1fX-2H  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 /0r6/ _5-.  
   for(int index=0;index<MAX_KEY;index++){ >/'/^h  
    if(hCallWnd[index]==NULL) bd&Nf2  
     continue; ok{ F=z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }1|FES  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); zYEb#*Kar  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 y'_2|5!Qs  
   } p:xVi0  
  } Eb p=du  
 } !=?Q>mz  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); X<d`!,bn@  
} \9 k3;zw  
g2 tM!IRQ  
  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: $1n\jN  
Wql,*|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v[~Q   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); DI=?{A  
#@<L$"L  
  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: }LryRcrD-n  
lL*"N|Y  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) xzBUm  
{ Hd{@e6S  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) s} oD?h:T3  
 { 0W,.1J2*  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 zd3^k<  
  SaveBmp(); T&->xe f=  
  return FALSE; YXDuhrs}  
 } uHPd!# ]  
 …… //其它处理及默认处理 tHFBLM  
} #,;Q|)AD:e  
gaR~K  
G=&nwSL  
  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。 #NWS)^&1b  
} ^WmCX2a  
  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。 V(0V$&qipc  
$j"BHpN  
  二、编程步骤 RU% 4~WC  
Q: j)F|uhc  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Jm,tN/o*  
Tb!jIe  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ITfz/d8  
~c@@m\C"b  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; H4uHCkj  
,OBJ>_5  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 5?|yYQM0tK  
=}2k+v-B  
  5、 添加代码,编译运行程序。 _c,{}sn  
j>#ywh*A  
三、程序代码 2!GyQ@&[W  
C;']FmK]  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 41I2t(H @z  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) uuYeXI;  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ [!U! Z'i  
#if _MSC_VER > 1000 I.kuYD62  
#pragma once hSG1f`  
#endif // _MSC_VER > 1000 JwdvY]  
#ifndef __AFXWIN_H__ !H~PF*,hY  
#error include 'stdafx.h' before including this file for PCH UP*5M  
#endif 6/&|)gW',  
#include "resource.h" // main symbols Jn"ya^~  
class CHookApp : public CWinApp ;jFUtG  
{ +$#ytvDy  
 public: 2j=HxE  
  CHookApp(); U$LI~XZM  
  // Overrides nT=XWM  
  // ClassWizard generated virtual function overrides OXF/4Oe  
  //{{AFX_VIRTUAL(CHookApp) \Yr&vX/[p  
 public: $.3J1DU  
  virtual BOOL InitInstance(); pV/5w<_x?  
  virtual int ExitInstance(); lFa?l\jLXZ  
  //}}AFX_VIRTUAL p:3 V-$4X  
  //{{AFX_MSG(CHookApp) EXti  
  // NOTE - the ClassWizard will add and remove member functions here. 7towjw r  
  // DO NOT EDIT what you see in these blocks of generated code ! C#P7@JE  
  //}}AFX_MSG Z5,"KhB]  
  DECLARE_MESSAGE_MAP() *|6*jU  
}; Yduj3Ht:w  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 5W(`lgVs,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  Vsd4;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |l:,EA_v|  
BOOL InitHotkey(); q>[}JtXK  
BOOL UnInit(); wQojmmQ  
#endif {VKP&{~O  
`: 9n ]xP  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Gk!CU"`sP  
#include "stdafx.h" &_,.*tha  
#include "hook.h" '}E"M db  
#include <windowsx.h> <%S[6*6U  
#ifdef _DEBUG )|KZGr  
#define new DEBUG_NEW i:7cdhz  
#undef THIS_FILE [#+klP$  
static char THIS_FILE[] = __FILE__; L[MAc](me-  
#endif jm,:jkr  
#define MAX_KEY 100 7x.] 9J  
#define CTRLBIT 0x04 -+kTw06_C  
#define ALTBIT 0x02 dm"|\7  
#define SHIFTBIT 0x01 B*n_ VBd  
#pragma data_seg("shareddata") =m U</F)  
HHOOK hHook =NULL; G4G<Ow)`  
UINT nHookCount =0; 0r]-Ltvl?}  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ET\rd5Po  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT |v:fP;zc  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey '3TfW61]  
static int KeyCount =0; (} Y|^uM,  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ;Ngu(es6  
#pragma data_seg() *ch7z|wo.  
HINSTANCE hins; wPaMYxO/  
void VerifyWindow(); eNr2-R  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) l|fb;Giq=D  
//{{AFX_MSG_MAP(CHookApp) vxXrVPU3  
// NOTE - the ClassWizard will add and remove mapping macros here. ogG:Ai)90  
// DO NOT EDIT what you see in these blocks of generated code! B0,C!??5  
//}}AFX_MSG_MAP " l>tFa  
END_MESSAGE_MAP() ?y,z  
K'b #}N\  
CHookApp::CHookApp() [y(<1]i-a  
{ WTwura,  
 // TODO: add construction code here, $mn+  
 // Place all significant initialization in InitInstance ~2O1$ou  
} p`}G" DM  
]~\%ANoi  
CHookApp theApp; B X Et]+Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) HA~BXxa/  
{ `9Q O'^)  
 BOOL bProcessed=FALSE; `$ZBIe/u  
 if(HC_ACTION==nCode) OVEQ^\Q5D  
 { 6<{SbE|G{  
  if((lParam&0xc0000000)==0xc0000000){// Key up }nMp.7b  
   switch(wParam) -x+K#T0Z  
   { e?fA3Fug  
    case VK_MENU: T:S[[#f{5  
     MaskBits&=~ALTBIT; (gb vInZ  
     break; iV.j!H7o  
    case VK_CONTROL: !%>(O@~"|  
     MaskBits&=~CTRLBIT; A<[BR*n  
     break; AV;x'H7G  
    case VK_SHIFT: sYd)r%%AU  
     MaskBits&=~SHIFTBIT; k<k@Tlo  
     break; 0E/16@6=  
    default: //judge the key and send message }/aqh;W  
     break; !5K5;M_Ih"  
   } >?r8D48`  
   for(int index=0;index<MAX_KEY;index++){ U2*kuP+n  
    if(hCallWnd[index]==NULL) 5]Y?NN,GR  
     continue; o=Ia{@   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z;PF% F  
    { 6yedl0@wa!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )\QPUdOvx  
     bProcessed=TRUE; EsjZ;D, c(  
    } DB.)/(zWQ  
   } C*Wyw]:r  
  } p~h [4hP  
  else if((lParam&0xc000ffff)==1){ //Key down @P6*4W  
   switch(wParam) !">EZX  
   { vec4R )S  
    case VK_MENU: .Tc?PmN  
     MaskBits|=ALTBIT; *&$2us0%%  
     break; 6}?5Oy_XF2  
    case VK_CONTROL: :KBy(}V  
     MaskBits|=CTRLBIT; J6g:.jsK!  
     break; ^d!I{ y#  
    case VK_SHIFT: )X 'ln  
     MaskBits|=SHIFTBIT; jDCf]NvOPM  
     break; KfV& 7yi  
    default: //judge the key and send message K'S \$  
     break; O*m9qF<  
   } VVHL@  
   for(int index=0;index<MAX_KEY;index++) lcEUK  
   { ->5[C0: ]  
    if(hCallWnd[index]==NULL) betTAbF  
     continue; TJz} 8-#t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i#(+Kxr]>  
    { _t@9WA;+\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2R~[B]2"r  
     bProcessed=TRUE; R|R3Ob.e  
    } \x=!'  
   } tW"s^r=95  
  } ]vZ}4Xno  
  if(!bProcessed){ xH{V.n&v  
   for(int index=0;index<MAX_KEY;index++){ # #/ l  
    if(hCallWnd[index]==NULL) #s|,o Im  
     continue; !b'!7p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z i3gE$7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |#x]/AXa0/  
   } Pv Vn}i   
  } drh,=M\F  
 } 7WEoyd  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Tu-I".d+  
} 4 |xQQv  
'2v$xOh!y  
BOOL InitHotkey() dyuT-.2  
{ \\$wg   
 if(hHook!=NULL){ okLhe F  
  nHookCount++; d?>pcT)G_  
  return TRUE; [_zoJ  
 } rl XMrn  
 else HQ`A.E2  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); % e1`wMa  
  if(hHook!=NULL) +3o 4KB}  
   nHookCount++; ki9vJ<  
  return (hHook!=NULL); -SKcS#IF  
} Qd"u$~ qC  
BOOL UnInit() m,#Us  
{  b~Oc:  
 if(nHookCount>1){ wPH1g*U  
  nHookCount--; & 6~AY :0r  
  return TRUE; <77v8=as5  
 } :hUt7/3c  
 BOOL unhooked = UnhookWindowsHookEx(hHook); }7Y @u@R  
 if(unhooked==TRUE){ 81Ityd-}  
  nHookCount=0; `sJv?  
  hHook=NULL; 0xpE+GY  
 } x).`nZ1  
 return unhooked; ?Fj >7  
} zq4)Uab*  
7"$9js2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) JsbH'l  
{ $/;<~Pzi  
 BOOL bAdded=FALSE; 6D1tRo  
 for(int index=0;index<MAX_KEY;index++){ Wup%.yT~Ds  
  if(hCallWnd[index]==0){ 8ubb~B;  
   hCallWnd[index]=hWnd; 2[yfo8H  
   HotKey[index]=cKey; cK H By  
   HotKeyMask[index]=cMask; P>;uS  
   bAdded=TRUE; y2NVx!?n  
   KeyCount++; K 6HH_T  
   break; _:.'\d(  
  } 4@*`V  
 } 7;H P_oAu  
 return bAdded; S9@)4|3C|p  
} - u'5xn7  
6yPh0n  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q^\f,E\S  
{ p_l.a  
 BOOL bRemoved=FALSE; Kgu#M i~  
 for(int index=0;index<MAX_KEY;index++){ TH#5j.uUs  
  if(hCallWnd[index]==hWnd){ t/0h)mL}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Vh;P,no#  
    hCallWnd[index]=NULL; p_Y U!j_VE  
    HotKey[index]=0; 8cv[|`<  
    HotKeyMask[index]=0; WbDD9ZS  
    bRemoved=TRUE; SoJ'y6  
    KeyCount--; T1c.ER}17  
    break; &?j]L4%  
   } NlV,] $L1T  
  } V( bU=;Qo  
 } $09PZBF,i  
 return bRemoved; O^yD b  
} 3QO*1P@q  
5Bog\mS  
void VerifyWindow() #ZvDf5A  
{ !BikqTM  
 for(int i=0;i<MAX_KEY;i++){ @8xa"Dc  
  if(hCallWnd!=NULL){ VN!+r7w'  
   if(!IsWindow(hCallWnd)){ +^v]d_~w_  
    hCallWnd=NULL; IL2OVLX  
    HotKey=0; #{oGmzG!  
    HotKeyMask=0; ]^ "BLbDZ@  
    KeyCount--; Mk$Pt  
   } g_F-PT>($  
  } 5fVm392+  
 } z Qhc V  
} Bfz]PN78.G  
e#j kp'  
BOOL CHookApp::InitInstance() ww(.   
{ }|!9aojr  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); E3<~C(APW  
 hins=AfxGetInstanceHandle(); Af%#&r7W  
 InitHotkey(); KOM]7%ys1H  
 return CWinApp::InitInstance(); ra*(.<&  
} Msea kF  
 y+.E}  
int CHookApp::ExitInstance() ;'g.%  
{ BPkqC>w  
 VerifyWindow(); #>/s tU-  
 UnInit(); l9up?opq  
 return CWinApp::ExitInstance(); b`Agb <x"  
} xIh,UW#  
!-gjA@Pk  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file cw)'vAE  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) z'+k]N9Q^  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ \C(dWs  
#if _MSC_VER > 1000 N)H _4L  
#pragma once +f- E8q  
#endif // _MSC_VER > 1000 ehCZhi~  
}qhNz0*  
class CCaptureDlg : public CDialog Sd0y=!Pj=  
{ oykqCN  
 // Construction g9$P J:  
 public: hi(u L>\  
  BOOL bTray; ?6[X=GeUs  
  BOOL bRegistered; #MhieG5  
  BOOL RegisterHotkey(); C@8WY  
  UCHAR cKey; a6vls]?  
  UCHAR cMask; R?K[O   
  void DeleteIcon(); V%c1+h<  
  void AddIcon(); D>~S-]  
  UINT nCount; %ut7T!Jp  
  void SaveBmp(); yF#:*Vz>  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor m {)F9F  
  // Dialog Data 9WH  
  //{{AFX_DATA(CCaptureDlg) 'Oe}Ja  
  enum { IDD = IDD_CAPTURE_DIALOG }; i[wEH1jR  
  CComboBox m_Key; +UTs2*H/^  
  BOOL m_bControl; xep!.k x  
  BOOL m_bAlt; 1-=zSWmyK  
  BOOL m_bShift; b&$sY!iU  
  CString m_Path; ~YX!49XfHh  
  CString m_Number; - #ta/*TT:  
  //}}AFX_DATA Nhm)bdv]  
  // ClassWizard generated virtual function overrides mCY+V~^~kz  
  //{{AFX_VIRTUAL(CCaptureDlg) /`j~r;S  
 public: u9 yXHf  
  virtual BOOL PreTranslateMessage(MSG* pMsg); =h{j F7  
 protected: N){/#3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support n#|pR2  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 6_w;dnVA  
  //}}AFX_VIRTUAL Rf~? u)h1  
  // Implementation 50S >`qi2x  
 protected: sBo|e]m#  
  HICON m_hIcon; !VfP#B6.  
  // Generated message map functions *&\fBi]  
  //{{AFX_MSG(CCaptureDlg) @%5$x]^  
  virtual BOOL OnInitDialog(); }gr6naz  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); =[ $zR>o*%  
  afx_msg void OnPaint(); :]viLw\&g  
  afx_msg HCURSOR OnQueryDragIcon(); AxOn~fZ!  
  virtual void OnCancel(); Z\`i~  
  afx_msg void OnAbout(); *k]izWsV*  
  afx_msg void OnBrowse(); ^nS'3g^"  
  afx_msg void OnChange(); i8tH0w/(M  
 //}}AFX_MSG QF7iU@%-  
 DECLARE_MESSAGE_MAP() ftqi>^i  
}; 2 P=c1;  
#endif lAM"l)Ij  
~?m vV`30&  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 0PK*ULwSN  
#include "stdafx.h" 16p$>a<6  
#include "Capture.h" ,MtN_V-  
#include "CaptureDlg.h" TzCNY@y  
#include <windowsx.h> !H5r+%Oo|  
#pragma comment(lib,"hook.lib") 3+%c*}KC~  
#ifdef _DEBUG FTihxC?.L  
#define new DEBUG_NEW V=@M!;'<  
#undef THIS_FILE jtMN)TM  
static char THIS_FILE[] = __FILE__; Ier0F7]I  
#endif %Q}T9%Mtj  
#define IDM_SHELL WM_USER+1 {hr+ENgV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "uz}`G~O  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?W%9H\;  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; N* C"+2  
class CAboutDlg : public CDialog QzwA*\G  
{ /uc*V6Xd (  
 public: 2xchjU-  
  CAboutDlg(); Sc<%$ Gd  
  // Dialog Data }#[MV+D  
  //{{AFX_DATA(CAboutDlg) * 7ki$f!  
  enum { IDD = IDD_ABOUTBOX }; W6&s_ (  
  //}}AFX_DATA 3MR4yw5v  
  // ClassWizard generated virtual function overrides @bN`+DC!<  
  //{{AFX_VIRTUAL(CAboutDlg) FQbF)K~e  
 protected: >taC_f06  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xp395ub6  
  //}}AFX_VIRTUAL ^cE|o&Rm;  
  // Implementation g|W|>`>  
 protected: A.!V*1h{  
  //{{AFX_MSG(CAboutDlg) F+Qp mVU  
  //}}AFX_MSG p&nIUx"  
  DECLARE_MESSAGE_MAP() vGK'U*gGD  
}; YGBVGpE9  
W2F %E  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) t?1+Yw./em  
{ Ip/_uDi+!Z  
 //{{AFX_DATA_INIT(CAboutDlg) 3H0~?z_  
 //}}AFX_DATA_INIT AwhXCq|k  
} D Hkmn  
+gG6(7&+=  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) <z3:*=!  
{ $J>J@4  
 CDialog::DoDataExchange(pDX); }";\8  
 //{{AFX_DATA_MAP(CAboutDlg) k!gft'iU  
 //}}AFX_DATA_MAP [@U2a$k+d  
} \}0J%F1  
]j.??'+rg  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) kI>Iq Q-h  
 //{{AFX_MSG_MAP(CAboutDlg) \($EYhx  
 // No message handlers dMAd-q5{  
 //}}AFX_MSG_MAP x[Xj[O  
END_MESSAGE_MAP() l@ +]XyLj  
?fB}9(6  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) U"} ml  
: CDialog(CCaptureDlg::IDD, pParent) mK3U*)A   
{ ^^[MDjNy@  
 //{{AFX_DATA_INIT(CCaptureDlg) U*G9fpVy  
  m_bControl = FALSE; `!?SA<a:  
  m_bAlt = FALSE; DP=4<ES%+  
  m_bShift = FALSE; .".xNHR#  
  m_Path = _T("c:\\"); u:+wuyu  
  m_Number = _T("0 picture captured."); sK~d{)+T  
  nCount=0; zG_e=   
  bRegistered=FALSE; eGrC0[SH  
  bTray=FALSE; *I0{1cST  
 //}}AFX_DATA_INIT Xg |_  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 8iTX}$t\{  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); P 0xInW F  
} |];s[^$#  
6Sh0%F s  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) T<*i($ [  
{ @Oe!*|?mS  
 CDialog::DoDataExchange(pDX); ][8ZeM9&p  
 //{{AFX_DATA_MAP(CCaptureDlg) Q ^%+r"h  
  DDX_Control(pDX, IDC_KEY, m_Key); eWvL(2`Tx  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); YKwej@9,  
  DDX_Check(pDX, IDC_ALT, m_bAlt); i 7:R4G(/#  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); V#;6 <H"  
  DDX_Text(pDX, IDC_PATH, m_Path); o<f[K}t9  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Fx']kn9  
 //}}AFX_DATA_MAP )--v> *,V  
} RsJj*REO  
Zfyr& ]"  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0r=:l/Pz  
//{{AFX_MSG_MAP(CCaptureDlg) t.m65  
 ON_WM_SYSCOMMAND() Ug=8:a(U.  
 ON_WM_PAINT() 45l/)=@@B  
 ON_WM_QUERYDRAGICON() ,?;q$Xoi  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) T"Ph@I<  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) \HFeEEKH  
 ON_BN_CLICKED(ID_CHANGE, OnChange) * ";A~XNx  
//}}AFX_MSG_MAP T$/6qZew  
END_MESSAGE_MAP() ;+XiDEX0}  
-[?q?w!?  
BOOL CCaptureDlg::OnInitDialog() &) 7umdSgi  
{  ]qCAog  
 CDialog::OnInitDialog(); !n4p*<Y6  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |V{'W-` |[  
 ASSERT(IDM_ABOUTBOX < 0xF000); {.2A+JT,  
 CMenu* pSysMenu = GetSystemMenu(FALSE); hA)tad]  
 if (pSysMenu != NULL) E<;C@B  
 { (v*$ExF  
  CString strAboutMenu; ?#^(QR|/  
  strAboutMenu.LoadString(IDS_ABOUTBOX); _@0>y MZ^  
  if (!strAboutMenu.IsEmpty()) 9aT#7B  
  { #imMkvx?  
   pSysMenu->AppendMenu(MF_SEPARATOR); Hs<vCL \  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); QSf{V(fs  
  } g9OO#C>  
 } |S#)[83*3  
 SetIcon(m_hIcon, TRUE); // Set big icon 1lu _<?O  
 SetIcon(m_hIcon, FALSE); // Set small icon %\-u&  
 m_Key.SetCurSel(0); . Rxz;-VA  
 RegisterHotkey(); (u@p[ncN}  
 CMenu* pMenu=GetSystemMenu(FALSE); Dt\F]\6sd  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); DPI iGRw  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :i+Tf~k{  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ,6?L.L  
 return TRUE; // return TRUE unless you set the focus to a control hp6S *d  
} gl-O"%rMcL  
'VCF{0{H~  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) XPE{]4 g  
{ XEM i~L+  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) x]6OE]]8L  
 { nE)?P*$3Z  
  CAboutDlg dlgAbout; x7 jE Ns )  
  dlgAbout.DoModal(); H `Fe |6I&  
 } ,o\v umx  
 else [9NzvC 9I  
 { & D4'hL3  
  CDialog::OnSysCommand(nID, lParam); * 3mF.^  
 } HjUs}#</  
} 9r!psRA:`)  
($&i\e31N  
void CCaptureDlg::OnPaint() ~7T]l1]W%  
{ IBr?6_\%"4  
 if (IsIconic()) W #E-vi+l  
 { d4F3!*@(  
  CPaintDC dc(this); // device context for painting :Zl@4}  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); HYf&0LT<11  
  // Center icon in client rectangle r`}')2  
  int cxIcon = GetSystemMetrics(SM_CXICON); UOy9N  
  int cyIcon = GetSystemMetrics(SM_CYICON); !},_,J~(|  
  CRect rect; , }O>,AU  
  GetClientRect(&rect); hl?G_%a  
  int x = (rect.Width() - cxIcon + 1) / 2; Zo}wzY~x>I  
  int y = (rect.Height() - cyIcon + 1) / 2; GZQy~Uk~  
  // Draw the icon }$r/#F/Fn  
  dc.DrawIcon(x, y, m_hIcon); jHq.W95+P  
 } B uV@w-|  
 else Q1?  !,a  
 { 4~=/CaG~  
  CDialog::OnPaint(); X*6bsYbK-  
 } [f,; +Ze  
} +gh6eY8  
ZG>I[V'p=  
HCURSOR CCaptureDlg::OnQueryDragIcon() sA=WU(4^  
{ :hB/|H*=  
 return (HCURSOR) m_hIcon; -v#0.3zm  
} G4][`C]8c  
rAq2   
void CCaptureDlg::OnCancel() zts%oIgV  
{ ] P;Ng=a  
 if(bTray) 1>bG]l1//  
  DeleteIcon(); XOK.E&eilj  
  CDialog::OnCancel(); OI</o0Ca  
} e>\[OwF-x  
V(n7hpS  
void CCaptureDlg::OnAbout() (<!Yw|~  
{ :G\f(2@  
 CAboutDlg dlg; 3:1 h:Yc<  
 dlg.DoModal(); 57*`y'C W  
} -E_lwK  
<hazrKUn  
void CCaptureDlg::OnBrowse() W Z`u"t^2V  
{ ^\:"o  
 CString str; k_$:?$  
 BROWSEINFO bi; @ *'$QD,  
 char name[MAX_PATH]; [;yEG$)K  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); H.#<&5f  
 bi.hwndOwner=GetSafeHwnd(); WBdC}S }3t  
 bi.pszDisplayName=name; K1]m:Y<  
 bi.lpszTitle="Select folder"; HC4qP9Gs  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Ux5pw  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); YJi C}.4Q  
 if(idl==NULL) R]hilb'a  
  return; ;^VLx)q  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); d 2f   
 str.ReleaseBuffer(); &0A^_Z .nA  
 m_Path=str; C{7 j<O  
 if(str.GetAt(str.GetLength()-1)!='\\') <pzCpF<  
  m_Path+="\\"; 'o41)p  
 UpdateData(FALSE); G}ZJ}5h  
} zyb>PEd.  
d'Cn] <  
void CCaptureDlg::SaveBmp() +zM WIG  
{ q^5j&jx Vl  
 CDC dc; iK&s_}i:  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); .dqV fa  
 CBitmap bm;  vV5dW  
 int Width=GetSystemMetrics(SM_CXSCREEN); UbDRzum  
 int Height=GetSystemMetrics(SM_CYSCREEN); op!8\rM<e  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ;A^Ii>`  
 CDC tdc; x z5 V.  
 tdc.CreateCompatibleDC(&dc); |T!ivd1G  
 CBitmap*pOld=tdc.SelectObject(&bm); T\Zf`.mt  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); X6hm,0[  
 tdc.SelectObject(pOld); PL*Mz(&bf  
 BITMAP btm; -2Bkun4Pt  
 bm.GetBitmap(&btm); "N'|N.,  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ry^FJyjW  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |"t)#BUtL  
 BITMAPINFOHEADER bih; f,S,35`qa  
 bih.biBitCount=btm.bmBitsPixel; /K!&4mK  
 bih.biClrImportant=0; ~MuD`a7#G  
 bih.biClrUsed=0; ep|>z#1  
 bih.biCompression=0; A5U//y![{  
 bih.biHeight=btm.bmHeight; LBO3){=J  
 bih.biPlanes=1; Ph{7S43  
 bih.biSize=sizeof(BITMAPINFOHEADER); `XT8}9z!  
 bih.biSizeImage=size; E]T>m!6  
 bih.biWidth=btm.bmWidth; =~qQ?;o n  
 bih.biXPelsPerMeter=0; 5W%^g_I  
 bih.biYPelsPerMeter=0; W|C>X=zTi  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); !'yCB9]O  
 static int filecount=0; SQ$|s%)oB  
 CString name; t(d$v_*y51  
 name.Format("pict%04d.bmp",filecount++); Kyn[4Bu!?  
 name=m_Path+name; Q&Q$;s3|Y  
 BITMAPFILEHEADER bfh; $@WqM$  
 bfh.bfReserved1=bfh.bfReserved2=0; :.2Tcq  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Gcu[G]D  
 bfh.bfSize=54+size; 0#$<2  
 bfh.bfOffBits=54; \L6kCY  
 CFile bf; T;?=,'u  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ [9}D+k F  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); aXOW +$,  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); & B CA  
  bf.WriteHuge(lpData,size); 45?aV@  
  bf.Close(); E[IjeJB5  
  nCount++; Ev%_8CO4e  
 } c;RL<83:  
 GlobalFreePtr(lpData); _BC%98:WP  
 if(nCount==1) [SJ-]P|^l  
  m_Number.Format("%d picture captured.",nCount); 1u9*)w  
 else 9YMD[H\}V  
  m_Number.Format("%d pictures captured.",nCount); A(j9T,!  
  UpdateData(FALSE); __B`0t  
} aRt`IcZYz  
wWh)yfPh8H  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) sN"JVJXi  
{ v|]1x2191  
 if(pMsg -> message == WM_KEYDOWN) "W"2 Y(  
 { f*(W%#*|  
  if(pMsg -> wParam == VK_ESCAPE) !@.9>"FU  
   return TRUE; DK6^\k][V  
  if(pMsg -> wParam == VK_RETURN) 7{"urs7 T  
   return TRUE; uT\|jv,  
 } XA1gV>SJ  
 return CDialog::PreTranslateMessage(pMsg); %I`%N2ss  
} f+WN=-F\  
Q;h6F{i  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) mi`jY0e2  
{ 2:8p>^g=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ fN|'aq*Pd  
  SaveBmp(); D#8uj=/%  
  return FALSE; REK(^1 h  
} eH0^d5bH  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;Z asK0  
 CMenu pop; ,NA _pvH)  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); >>>&{>}!  
 CMenu*pMenu=pop.GetSubMenu(0); QTC-W2t]  
 pMenu->SetDefaultItem(ID_EXITICON); N4L#$\M  
 CPoint pt; Yg~$1b@  
 GetCursorPos(&pt); $XZC8L#  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 4?u<i=i  
 if(id==ID_EXITICON) '0jjoZ:  
  DeleteIcon();  l,lfkm  
 else if(id==ID_EXIT) wf,B/[,d  
  OnCancel(); ab!Cu8~v  
 return FALSE; rFJPeK7  
} I@M3u/7  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); izvwXC  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 57S!X|CE  
 AddIcon(); 9&O7F}VP2  
 return res; - ^f>=xa4J  
} qhQeQ  
K|ZB!oq  
void CCaptureDlg::AddIcon() UG,<\k&  
{ X:Iam#H  
 NOTIFYICONDATA data; />13?o#  
 data.cbSize=sizeof(NOTIFYICONDATA); [" PRxl  
 CString tip; `0z8J*T]  
 tip.LoadString(IDS_ICONTIP); "<Q,|Md  
 data.hIcon=GetIcon(0); QI WfGVc-  
 data.hWnd=GetSafeHwnd(); 6");NHE  
 strcpy(data.szTip,tip); G@=H=' :~  
 data.uCallbackMessage=IDM_SHELL; I #bta  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 7lH.>n  
 data.uID=98; ?E6 C|A$I  
 Shell_NotifyIcon(NIM_ADD,&data); g~v>{F+u  
 ShowWindow(SW_HIDE); ] v8.ym  
 bTray=TRUE; 6qF9+r&e ?  
} p|&9#?t4A  
Oe_*(q&  
void CCaptureDlg::DeleteIcon() 0Q)m>oL.  
{ 5f- eWW]!  
 NOTIFYICONDATA data; Ty5}5)CRZ  
 data.cbSize=sizeof(NOTIFYICONDATA); y7@q]~%  
 data.hWnd=GetSafeHwnd(); z:JQ3D7/we  
 data.uID=98; F4|U\,g  
 Shell_NotifyIcon(NIM_DELETE,&data); ]N4?*S*jd)  
 ShowWindow(SW_SHOW); }M|,Z'@*  
 SetForegroundWindow(); B4kJ 7Pdny  
 ShowWindow(SW_SHOWNORMAL); #bZT&YE^  
 bTray=FALSE; 6b7SA ,  
} YkJnZ_k/P  
LO@='}D=  
void CCaptureDlg::OnChange() vNIQ1x5Za  
{ J5j3#2l  
 RegisterHotkey(); `F,*NESv  
} Qs #7<NQ  
--BS/L-  
BOOL CCaptureDlg::RegisterHotkey() w\`u |f;Aq  
{ +/|t8zFWs  
 UpdateData(); Re]7G.y  
 UCHAR mask=0; s+7#TdhA  
 UCHAR key=0; 2r*Yd(e  
 if(m_bControl) M # ) @!  
  mask|=4; \ QE?.Fx  
 if(m_bAlt) /5&' U!:+  
  mask|=2; 96]!*}  
 if(m_bShift) Z+M* z;  
  mask|=1; |9x H9@^f  
  key=Key_Table[m_Key.GetCurSel()]; 0$1-5XY9  
 if(bRegistered){ pe@j`Sm:Ej  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5fuB((fd(  
  bRegistered=FALSE; ITr@;@}c]  
 } :+Okv$v4  
 cMask=mask; )zYm]\@  
 cKey=key; o3kVcX^  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); M_Z(+k{Gy  
 return bRegistered; ]J)3y+;P  
} ffgb 3  
}35HKgqX  
  四、小结 (sN;B)  
;($"_h  
  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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