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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: fhC=MJ @  
  'HC4Q{b`  
  一、实现方法 4fN<pG,  
jQc0_F\  
  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: ?O_;{(F_  
i^n&K:6  
#pragma data_seg("shareddata") {{O1C ~  
HHOOK hHook =NULL; //钩子句柄 y.>r>o"0  
UINT nHookCount =0; //挂接的程序数目 V'9 k;SF  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 6PTD%Rf\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 :!R+/5a  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ,e;(\t:  
static int KeyCount =0; Z6Mh`:7  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 al5?w{us  
#pragma data_seg() !rXyw`6N  
]6%| L  
  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。 3A+d8fwi  
`527vK 6  
  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: OaEOk57%de  
hWUZn``U$|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR #bGt%*Re p  
cKey,UCHAR cMask) $GcVC (]  
{ lAoH@+dyA+  
 BOOL bAdded=FALSE; e]rWR  
 for(int index=0;index<MAX_KEY;index++){ 5r.{vQ  
  if(hCallWnd[index]==0){ rc$G0O  
   hCallWnd[index]=hWnd; [1E u6X6  
   HotKey[index]=cKey; 6VA@;g0$  
   HotKeyMask[index]=cMask; mtHw!*  
   bAdded=TRUE; l<gg5 Zea  
   KeyCount++; * @oAM,@  
   break; iR_X,&p   
  } 3c6#?<%0`  
 } 5T,`j=\  
 return bAdded; IQR?n}ce  
} @P% &Dha  
//删除热键 S3 &L  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3.8d"  
{ :imp~~L;  
 BOOL bRemoved=FALSE; wp} PQw:  
 for(int index=0;index<MAX_KEY;index++){ GU_R6Wt+  
  if(hCallWnd[index]==hWnd){ -{ZRk[>Z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <Q%\ pAP}b  
    hCallWnd[index]=NULL; .aNy)Yu8  
    HotKey[index]=0; l2$6ojpo  
    HotKeyMask[index]=0; O)W1.]GMbf  
    bRemoved=TRUE; pwm ]2}+  
    KeyCount--; b,s T[!X[  
    break; %rYd=Ri  
   } gi~*1RIel;  
  } ]m YY1%H8M  
 } 'H97D-86/  
 return bRemoved; n&&X{Rl  
} o@"H3 gz  
@dw0oRF  
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  DLL中的钩子函数如下: kvKbl;<&#  
z`'{l {  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) XO219   
{ YX- G>.Pc  
 BOOL bProcessed=FALSE; 2b2/jzO}J  
 if(HC_ACTION==nCode) hbn2(e;FZ  
 { 3PPN_Z  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开  w;)@2}  
   switch(wParam) !A g W @  
   {  85-00m ~  
    case VK_MENU: U@DIO/C,m`  
     MaskBits&=~ALTBIT; H htAD Y  
     break; PY~cu@'k{  
    case VK_CONTROL: $o5<#g"/T  
     MaskBits&=~CTRLBIT; 5ILce%#zL  
     break; `Fnt#F}  
    case VK_SHIFT: z^@98:x  
     MaskBits&=~SHIFTBIT; c?IFI   
     break; R{u/r%  
    default: //judge the key and send message }fdo Aid~  
     break; BlMc<k  
   } S}mqK|!  
   for(int index=0;index<MAX_KEY;index++){  {|a=  
    if(hCallWnd[index]==NULL) g"^<LX-  
     continue; 6Xbo:#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $SA8$!:  
    { 8Y_wS&eB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); HvLvSy1U  
     bProcessed=TRUE; !3E33  
    } }GRZCX>  
   } Jwgd9a5  
  } 6]1cy&SG  
  else if((lParam&0xc000ffff)==1){ //有键按下 ZxLgV$U  
   switch(wParam) .3M=|rE   
   { E:!?A@Fy  
    case VK_MENU: CM|?;PBuv  
     MaskBits|=ALTBIT; c/%i,N\5  
     break; dJ#mk5= "  
    case VK_CONTROL: ^1nQDd*  
     MaskBits|=CTRLBIT; 5Z@OgR  
     break; #Fm,mO$v  
    case VK_SHIFT: |Q[[WHqj2f  
     MaskBits|=SHIFTBIT; t&*X~(Yb!  
     break; ^U)xQD"  
    default: //judge the key and send message wak_^8x  
     break; rzsAnLxo  
   } *#\da]"{  
   for(int index=0;index<MAX_KEY;index++){ rI23e[  
    if(hCallWnd[index]==NULL) {d|e@`"T  
     continue; W!MO }0s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %L,mj  
    { B}Qpqa=_c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); BUvE~l.,|  
     bProcessed=TRUE; q &]I  
    } t4X:I&l-M:  
   } 68 vu  
  } _=S 4H  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 o-H\vtOjE  
   for(int index=0;index<MAX_KEY;index++){ INt]OPD  
    if(hCallWnd[index]==NULL) /?C}PM  
     continue; )\ow/XPE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *.qm+#8W  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $q%r}Cdg  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 mO=bq4!  
   } .W>LEz'  
  } \W:~;GMeD  
 } _!2bZ:emG  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); XA PqRJ*Z  
} rY yB"|  
Vz[tgb]-  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: }04 EM  
G6@XRib3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )i|0Ubn[|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J$"3w,O6+U  
l/ufu[x!a  
  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: 0&wbGbg(W  
)"KKBil0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) l=4lhFG,Mk  
{ QmxI ;l  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) /zV&ebN]  
 { ;=r_R!d@  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ~FCkr&Ky3  
  SaveBmp(); \7]0vG  
  return FALSE; 0;6eSmF  
 } j AXKp b  
 …… //其它处理及默认处理 J;8M. _  
} KUD&vqx3  
C ^QpVt-T  
v%^"N_]  
  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。 dA 03,s  
lW6$v* s9  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 8U86-'Pq  
wjEyU:  
  二、编程步骤 Q^trKw~XNy  
rHngYcjR  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Q>d<4]`  
Fw.df<  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; mQd L"caA  
FqwH:Fcr:  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; K)DpC*j  
I.dS-)Y  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; {$AwG#kt  
V$o]}|  
  5、 添加代码,编译运行程序。 k7ye,_&>  
j3=%J5<  
三、程序代码 dBRK6hFC  
~$PY6s  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 8@rddk  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Ar{7H)V:  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Rq@M~;p  
#if _MSC_VER > 1000 H;w8[ImK  
#pragma once % H/V iC  
#endif // _MSC_VER > 1000 u7(<YSOs  
#ifndef __AFXWIN_H__ -}x( MZ  
#error include 'stdafx.h' before including this file for PCH *TyLB&<t  
#endif 2pQ29  
#include "resource.h" // main symbols l~(A(1  
class CHookApp : public CWinApp 9u0<$UY%  
{ Ie"eqO!  
 public: aWS_z6[t#6  
  CHookApp(); u,~/oTg O  
  // Overrides nF1}?  
  // ClassWizard generated virtual function overrides W#Eg\nT  
  //{{AFX_VIRTUAL(CHookApp) [%LIW%t|  
 public: 0&Z+P?Wb4  
  virtual BOOL InitInstance(); a'!p^/6?  
  virtual int ExitInstance(); h[(.  
  //}}AFX_VIRTUAL .QVN&UyZ  
  //{{AFX_MSG(CHookApp) JfLoGl;p m  
  // NOTE - the ClassWizard will add and remove member functions here. T;C0t9Yew  
  // DO NOT EDIT what you see in these blocks of generated code ! nVyV]'-z  
  //}}AFX_MSG nG4}8  
  DECLARE_MESSAGE_MAP() +d!"Zy2|B  
}; `=%mU/v  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); i K,^|Q8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *N65B#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); r7FFZNs!  
BOOL InitHotkey(); O= 84ZP%  
BOOL UnInit(); qbx}9pp}g  
#endif 89Ch'D  
ioT+,li  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. wGLSei-s  
#include "stdafx.h" +wIv|zj9  
#include "hook.h" Xte"tf9(C  
#include <windowsx.h> 6^vz+oN  
#ifdef _DEBUG ~{cG"  
#define new DEBUG_NEW >xCc#]v&  
#undef THIS_FILE AFdBf6/" i  
static char THIS_FILE[] = __FILE__; 8, " 5z_  
#endif S;tv4JY  
#define MAX_KEY 100 lvp8{]I<  
#define CTRLBIT 0x04 fx=HKt  
#define ALTBIT 0x02 l1UN.l'p  
#define SHIFTBIT 0x01 ~O8Xj6  
#pragma data_seg("shareddata") ;d<RP VE:  
HHOOK hHook =NULL; sjj,q?  
UINT nHookCount =0; d$5\{YLy  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey L %20tm  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT GUcGu5tw:  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey {?uG] G7  
static int KeyCount =0; x5(B(V@b  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Y]neTX [ef  
#pragma data_seg() g9G 8;  
HINSTANCE hins; jM[]Uh  
void VerifyWindow(); uRnSwJ"hE  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) _>u0vGF-  
//{{AFX_MSG_MAP(CHookApp) 6b-E|;"]:^  
// NOTE - the ClassWizard will add and remove mapping macros here. "w&G1kw5I  
// DO NOT EDIT what you see in these blocks of generated code! gJYX  
//}}AFX_MSG_MAP ?4sF:Y+\  
END_MESSAGE_MAP() i%# <Hi7  
dOFK;  
CHookApp::CHookApp() M/evZ?uis  
{ "JpnmE[`  
 // TODO: add construction code here, oGKk2oP  
 // Place all significant initialization in InitInstance L(`Rf0smt  
} Dssecc'  
BvqypLI  
CHookApp theApp; k.6(Q_TS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4l~B/"}  
{ }ZB :nnG  
 BOOL bProcessed=FALSE; glUf. :]  
 if(HC_ACTION==nCode) eb=#{  
 { {w52]5l  
  if((lParam&0xc0000000)==0xc0000000){// Key up bCmlSu  
   switch(wParam) q3e^vMK"  
   { :\69N/uw`  
    case VK_MENU: rvETt  
     MaskBits&=~ALTBIT; xB|?}uS-  
     break; l~'NqmXe  
    case VK_CONTROL: cIOM}/gqv  
     MaskBits&=~CTRLBIT; Rd:wMy$  
     break; L@x#:s=  
    case VK_SHIFT: &pN/+,0E  
     MaskBits&=~SHIFTBIT; Q}|QgN  
     break; M D,+>kh  
    default: //judge the key and send message R}0xWPt9G  
     break; w6G<&1iH  
   } VjGtEIew  
   for(int index=0;index<MAX_KEY;index++){ <?Y.w1  
    if(hCallWnd[index]==NULL) xa?   
     continue; 0=I:VGC3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) s\io9'Ec  
    { 57rH`UFXH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); xO<Uz"R  
     bProcessed=TRUE; &\ \)x.!  
    } *Ry{}|_8  
   } 8j jq)d4#  
  } 97\9!)`,  
  else if((lParam&0xc000ffff)==1){ //Key down f{ER]U  
   switch(wParam) a9niXy}a(  
   { <}t<A  
    case VK_MENU: X~> 2iL  
     MaskBits|=ALTBIT; @ZtDjxN &  
     break; #n6<jF1G  
    case VK_CONTROL: gF8n{b  
     MaskBits|=CTRLBIT; #9 u2LK  
     break; !fK9YW(Im  
    case VK_SHIFT: :uQ~?amM  
     MaskBits|=SHIFTBIT; MtXTh*4  
     break; +@jX|  
    default: //judge the key and send message sY@x(qkIOc  
     break; ![hVTZ,hyZ  
   } ;6/dFOZn  
   for(int index=0;index<MAX_KEY;index++) HWxwG'EEY,  
   { \Ss6F]K]  
    if(hCallWnd[index]==NULL) IrTMZG  
     continue; f) @-X!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?0hEd9TU  
    { 9MR,3/&N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +lED6 ]+%  
     bProcessed=TRUE; k \V6 q9*  
    } pipqXe  
   } jb lj]/  
  } HRF;qR9v  
  if(!bProcessed){ k/mO(i%qi  
   for(int index=0;index<MAX_KEY;index++){ Hribk[99  
    if(hCallWnd[index]==NULL)  >q^l  
     continue; vY'E+M"+@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) qgk6 \&K[  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |n q}#  
   } V>:ubl8j0l  
  } -Gn0TA2/C  
 } mrId`<L5l{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6ujePi <U  
} U]W+ers  
T Z_](%  
BOOL InitHotkey() 7FvtWE*  
{ $*z>t*{7  
 if(hHook!=NULL){ /G& %T  
  nHookCount++; J={R@}u  
  return TRUE; /.<2I  
 } ,/6 aA7(  
 else UCL aCt -  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); cr"AK"TQ  
  if(hHook!=NULL)  g1B[RSWv  
   nHookCount++; '/ v@q]!  
  return (hHook!=NULL); @WfX{485  
} K6nGC  
BOOL UnInit() z[bS soK`  
{ Qz9*o  
 if(nHookCount>1){ fsH =2p  
  nHookCount--; z-;2)RkV2  
  return TRUE; kCVA~ %d7  
 } <yz&> +9,  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +c-?1j  
 if(unhooked==TRUE){ B?p18u$i#l  
  nHookCount=0; Yk!TQY4  
  hHook=NULL; / +9o?Kxya  
 } Z+]Uw   
 return unhooked; SxWK@)tP  
} & U6bOH%P  
)MlT=k6S  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w0!4@  
{ E[E7GsmqV  
 BOOL bAdded=FALSE; `/\Z{j0_  
 for(int index=0;index<MAX_KEY;index++){ DU=rsePWE  
  if(hCallWnd[index]==0){ <Zn -P  
   hCallWnd[index]=hWnd; Qkq9oZ  
   HotKey[index]=cKey; .uwD;j +#  
   HotKeyMask[index]=cMask; {B,r  
   bAdded=TRUE; ]v,>!~8r  
   KeyCount++; QfHO3Y6h[  
   break; MPI=^rc2  
  } i |IG  
 } Mpu8/i gX,  
 return bAdded; \.,qAc\[  
} '&n4W7  
5}" @$.{i  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  Q  
{ 5y%-K=d  
 BOOL bRemoved=FALSE; Hd9vS"TN]  
 for(int index=0;index<MAX_KEY;index++){ [9>h! khs  
  if(hCallWnd[index]==hWnd){ Od5I:p]N  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /n&Y6@W  
    hCallWnd[index]=NULL; /yn%0Wish  
    HotKey[index]=0; !&b wFO>P  
    HotKeyMask[index]=0; .,$<waGD  
    bRemoved=TRUE; { i2QLS  
    KeyCount--; L}x,>hbT  
    break; Fy8$'oc  
   } #FQkwX'g  
  } !.}ZlA  
 } 4<{]_S6"0y  
 return bRemoved; i9 Tq h  
} W`2Xn?g  
Y&JK*d  
void VerifyWindow() n13#}i {tm  
{ "x P2GZ  
 for(int i=0;i<MAX_KEY;i++){ 1*o=I-nOa  
  if(hCallWnd!=NULL){ l=.h]]`;  
   if(!IsWindow(hCallWnd)){ j|/4V  
    hCallWnd=NULL; a/v!W@Zz}  
    HotKey=0; X:1&Pdi  
    HotKeyMask=0; }aC@ov]2  
    KeyCount--; Sh+$w=vC  
   } ;"N4Yflz  
  } DbH"e  
 } . vJlTg  
} K,' v{wSr  
OqcM3#  
BOOL CHookApp::InitInstance() E)}& p\{E  
{ n^P~]1i   
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); /-v6jiM  
 hins=AfxGetInstanceHandle(); |{en) {:  
 InitHotkey(); FC BsC#  
 return CWinApp::InitInstance();  o<Z  
} ]:X# w0UR  
<*'%Xgm  
int CHookApp::ExitInstance() $wBF'|eU  
{ znxP.=GB   
 VerifyWindow(); ]dj W^C]94  
 UnInit(); {BS}9jZx  
 return CWinApp::ExitInstance(); o&Vti"fpC  
} {Jx-Zo>'  
vdt":  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file bB->7.GXu  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7yM"G$  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ |2t1m 6\j  
#if _MSC_VER > 1000 D{)K00mm  
#pragma once X{YY)}^  
#endif // _MSC_VER > 1000 a?dUJt  
XHER[8l  
class CCaptureDlg : public CDialog c1x{$  
{ a(Fx1`}  
 // Construction v%2@M  
 public: + <4gJoI  
  BOOL bTray; g,61'5\  
  BOOL bRegistered; iT2{3 t  
  BOOL RegisterHotkey(); .4&pi  
  UCHAR cKey; ^ b`wf"A  
  UCHAR cMask; 2f8\Osn>m  
  void DeleteIcon(); KyQd6 1  
  void AddIcon(); 4J9VdEKk  
  UINT nCount; )4tOTi[  
  void SaveBmp();  Z,Z4Sp  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor >=+: lD  
  // Dialog Data `k]2*$%  
  //{{AFX_DATA(CCaptureDlg) cKM#0dq  
  enum { IDD = IDD_CAPTURE_DIALOG }; )d$FFTH  
  CComboBox m_Key; 5z~O3QX  
  BOOL m_bControl; )nM<qaI{  
  BOOL m_bAlt; XTro;R=#  
  BOOL m_bShift; _yN&+]c  
  CString m_Path; hq|I%>y  
  CString m_Number; Z&![W@m@0N  
  //}}AFX_DATA A6Vb'Gqv{  
  // ClassWizard generated virtual function overrides S8Ec.]T   
  //{{AFX_VIRTUAL(CCaptureDlg) 9(AY7]6  
 public: !-cK@>.pE  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 5ca!JLs  
 protected: o0}kRL  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Qt+i0xd  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); b2 5.CGF  
  //}}AFX_VIRTUAL \Aq$h:<  
  // Implementation Zb4+zps^-  
 protected: m<liPl uv  
  HICON m_hIcon; z55g'+Kab  
  // Generated message map functions AdgZau[Y6  
  //{{AFX_MSG(CCaptureDlg) iz-B)^8.  
  virtual BOOL OnInitDialog(); .:I^O[k  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); s$D"  
  afx_msg void OnPaint(); 5>!I6[{  
  afx_msg HCURSOR OnQueryDragIcon(); ^(+@uuBx  
  virtual void OnCancel(); ]*]#I?&'Hx  
  afx_msg void OnAbout(); =!N,{V_  
  afx_msg void OnBrowse(); "969F(S$  
  afx_msg void OnChange(); Z(Z$>P&4  
 //}}AFX_MSG bHK[Z5  
 DECLARE_MESSAGE_MAP() 9~5LKg7Ac  
}; Tf{lH9ca$  
#endif o#\c:D*k  
%u!)1oOIz  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file LF X[v   
#include "stdafx.h" f!K{f[aDa  
#include "Capture.h" n3" @E<rW  
#include "CaptureDlg.h" 7I=vgT1F  
#include <windowsx.h> qp{3I("_  
#pragma comment(lib,"hook.lib") V M{Sng  
#ifdef _DEBUG JKY  
#define new DEBUG_NEW L}UrI&]V$:  
#undef THIS_FILE ]MmFtdvE  
static char THIS_FILE[] = __FILE__; Q>g-xe 1  
#endif <0btwsv}  
#define IDM_SHELL WM_USER+1 dthtWnB@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 's\rQ-TV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :2*0Jh3_  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @>q4hYF  
class CAboutDlg : public CDialog -_^#7]  
{ Y;1s=B9  
 public: ys- w0H  
  CAboutDlg(); ">v- CSHY  
  // Dialog Data o\N^Uu  
  //{{AFX_DATA(CAboutDlg) Egi(z9|Pp  
  enum { IDD = IDD_ABOUTBOX }; SNrX(V::z  
  //}}AFX_DATA Aj{G=AT  
  // ClassWizard generated virtual function overrides :qvA'.L/;z  
  //{{AFX_VIRTUAL(CAboutDlg) R+5yyk\  
 protected: ~sVbg$]\G  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^5q}M'  
  //}}AFX_VIRTUAL )CoJ9PO7  
  // Implementation Q6$^lRNOpk  
 protected: y3Ul}mVhA  
  //{{AFX_MSG(CAboutDlg) ?.g="{5X  
  //}}AFX_MSG RV>n Op}R  
  DECLARE_MESSAGE_MAP() l(Y\@@t1  
}; X&gXhr#dL\  
p>1Klh:8.'  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) xMA2S*%ca  
{ nn8uFISb  
 //{{AFX_DATA_INIT(CAboutDlg) gg&Dej2{  
 //}}AFX_DATA_INIT 7e:7RAX  
} "Z#MR`;&29  
}_fVv{D   
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 4Ix~Feuph  
{ {k)H.zwe  
 CDialog::DoDataExchange(pDX); I3A xK A  
 //{{AFX_DATA_MAP(CAboutDlg) A"wso[{  
 //}}AFX_DATA_MAP SN5Z@kK  
} *qKf!&  
=zRjb>  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) f!bGH-.r5  
 //{{AFX_MSG_MAP(CAboutDlg) mMtva}=*  
 // No message handlers Q(BM0n)f  
 //}}AFX_MSG_MAP $%z M Z  
END_MESSAGE_MAP() BWLeitS/  
7!A3PDAe  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Q5c13g2(c  
: CDialog(CCaptureDlg::IDD, pParent) X=[`+=  
{ k8w:8*y'.  
 //{{AFX_DATA_INIT(CCaptureDlg) _Kv;hR>  
  m_bControl = FALSE; IF kU8EK&B  
  m_bAlt = FALSE; _/5xtupxE  
  m_bShift = FALSE; keS%w]87  
  m_Path = _T("c:\\"); DG/<#SCF  
  m_Number = _T("0 picture captured."); U?8X]  
  nCount=0; l-q.VY2  
  bRegistered=FALSE; %iD'2e:  
  bTray=FALSE; J\Z\q  
 //}}AFX_DATA_INIT TL@{yJ;s  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 G\Q0{4w8  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); _))--+cL  
} Z`yW2ON$'  
0kL tL!3  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) #IxCI)!I{[  
{ $`txU5#vs  
 CDialog::DoDataExchange(pDX); #4{9l SbU  
 //{{AFX_DATA_MAP(CCaptureDlg) +.|8W!h`1  
  DDX_Control(pDX, IDC_KEY, m_Key); lt|UehJ F  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ePY69!pO5e  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ol@LLT_m  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); RQW<Sp~  
  DDX_Text(pDX, IDC_PATH, m_Path); YA@OA$`E  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 2@f?yh0  
 //}}AFX_DATA_MAP $jN,] N~  
} /;9]LC.g  
0[!38  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ZZU"Q7`^  
//{{AFX_MSG_MAP(CCaptureDlg) ;op 8r u  
 ON_WM_SYSCOMMAND() gro@+^DmT  
 ON_WM_PAINT() $-lP"m@}  
 ON_WM_QUERYDRAGICON() f/]g@/`  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) +"D*0gYD  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) sRSy++FRF  
 ON_BN_CLICKED(ID_CHANGE, OnChange) T0lbMp  
//}}AFX_MSG_MAP Z$ 6yB  
END_MESSAGE_MAP() H:`[$ ^  
h7[PU^m  
BOOL CCaptureDlg::OnInitDialog() K*oWcsu  
{ &+7G|4!y  
 CDialog::OnInitDialog(); J@Qw6J  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); psAdYEGk!  
 ASSERT(IDM_ABOUTBOX < 0xF000); yWZ%|K~$  
 CMenu* pSysMenu = GetSystemMenu(FALSE); qb$f,E[  
 if (pSysMenu != NULL) j~`rc2n%  
 { k?ksv+e\  
  CString strAboutMenu; KHt.g`1:R  
  strAboutMenu.LoadString(IDS_ABOUTBOX); `+EjmY  
  if (!strAboutMenu.IsEmpty()) pYaq1_<+  
  { ]z 5gC`E0  
   pSysMenu->AppendMenu(MF_SEPARATOR); Hv<jf38  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 5Y(f7,JX  
  } qY%{c-aMA  
 } TkV*^j5  
 SetIcon(m_hIcon, TRUE); // Set big icon ompkDl\E  
 SetIcon(m_hIcon, FALSE); // Set small icon 2B&|0&WI  
 m_Key.SetCurSel(0); s(M8 Y  
 RegisterHotkey(); F<N{ x^  
 CMenu* pMenu=GetSystemMenu(FALSE); I:,D:00+  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Wo~#R   
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); @M]7',2"  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); yf7$m_$C'  
 return TRUE; // return TRUE unless you set the focus to a control MYF6tZ*  
} w|WehNGr  
b+ J)  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]BBL=$*  
{ 1U;p+k5c  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX)  d`&F  
 { ,MdK "Qa>  
  CAboutDlg dlgAbout; ET}Dh3A  
  dlgAbout.DoModal(); Irnfr\l.  
 } i-_ * 5%A  
 else _T[m YY  
 { ( mKuFz7  
  CDialog::OnSysCommand(nID, lParam); 7!-y72qx  
 } 0s8w)%4$  
} ZdY)&LJ  
"R v],O"  
void CCaptureDlg::OnPaint() "1Oe bo2  
{ #OVf2  "  
 if (IsIconic()) ::A]p@  
 { l:H}Y3_I  
  CPaintDC dc(this); // device context for painting U#U nM,3%  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 298@&_  
  // Center icon in client rectangle uGMmS9v$ J  
  int cxIcon = GetSystemMetrics(SM_CXICON); c;pv< lX'  
  int cyIcon = GetSystemMetrics(SM_CYICON); 6_h'0~3?`  
  CRect rect; O6$d@r;EK]  
  GetClientRect(&rect); NM_Xy<.~E  
  int x = (rect.Width() - cxIcon + 1) / 2; m6oaO9"K  
  int y = (rect.Height() - cyIcon + 1) / 2; l gzA) (  
  // Draw the icon p2: >m\  
  dc.DrawIcon(x, y, m_hIcon); ,wE cRN w  
 } c})f&Z@<  
 else wA;Cj  
 { 1y($h<  
  CDialog::OnPaint(); D!d1%hac  
 } 2[qlEtvQ  
}  +*aZ9g  
*eonXJYD  
HCURSOR CCaptureDlg::OnQueryDragIcon() Juqe%he`  
{ ~E tW B  
 return (HCURSOR) m_hIcon; I>(\B|\6  
} vMB`TpZ  
6@[7  
void CCaptureDlg::OnCancel() lboi\GP|  
{ rW(<[2vg  
 if(bTray) V O= o)H\  
  DeleteIcon();  rr=e  
  CDialog::OnCancel(); ht 1d[  
} nD51,1>  
UfWn\*J&k  
void CCaptureDlg::OnAbout() 08TeGUjJ  
{ yMoV|U6  
 CAboutDlg dlg; P 4|p[V8  
 dlg.DoModal(); W dNOE;R  
} ,_(AiQK  
8A ;)5!  
void CCaptureDlg::OnBrowse() _`(WX;sK  
{ n$O[yRMI[  
 CString str; hPB^|#}  
 BROWSEINFO bi; <//#0r*  
 char name[MAX_PATH]; d1rIU6  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 7A mnxFC  
 bi.hwndOwner=GetSafeHwnd(); F$k^px  
 bi.pszDisplayName=name; ?'$Yj>R6  
 bi.lpszTitle="Select folder"; @ysc?4% q  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; awic9 uMH  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); BQ7p<{G  
 if(idl==NULL) H ]x-s  
  return; /$ :w8  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )Z0bMO<  
 str.ReleaseBuffer(); yxx'g+D*  
 m_Path=str; GF=rGn@,)`  
 if(str.GetAt(str.GetLength()-1)!='\\') B3V;  
  m_Path+="\\"; HDY2<Hzc  
 UpdateData(FALSE); EDf"1b{PX  
} 0;V "64U  
,p\:Z3{ZH  
void CCaptureDlg::SaveBmp() Adma~]T9  
{ L" GQ Q  
 CDC dc; e: aa  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); d~F4  
 CBitmap bm; .*(xkJI3  
 int Width=GetSystemMetrics(SM_CXSCREEN); %HAforH  
 int Height=GetSystemMetrics(SM_CYSCREEN); ~0 Ifg_G  
 bm.CreateCompatibleBitmap(&dc,Width,Height); hE|W%~Jx  
 CDC tdc; &Q`{ Gk  
 tdc.CreateCompatibleDC(&dc); G)G 257K"~  
 CBitmap*pOld=tdc.SelectObject(&bm); j @HOU~x  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); tvlrUp  
 tdc.SelectObject(pOld); (rfR:[JkC2  
 BITMAP btm; x [_SNX"  
 bm.GetBitmap(&btm); O ;dtz\  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 'fIoN%  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 'C2X9/!,  
 BITMAPINFOHEADER bih; s9)U",  
 bih.biBitCount=btm.bmBitsPixel; OD O'!T-  
 bih.biClrImportant=0; O8Dav^\y?  
 bih.biClrUsed=0; p-Jp/*R5  
 bih.biCompression=0; 9z$fDs}.q  
 bih.biHeight=btm.bmHeight; Sr#\5UDS  
 bih.biPlanes=1; [Ep%9(SgA'  
 bih.biSize=sizeof(BITMAPINFOHEADER); D02(6|  
 bih.biSizeImage=size; !JGe .U5  
 bih.biWidth=btm.bmWidth; b?kY`LC  
 bih.biXPelsPerMeter=0; 00-cT9C3  
 bih.biYPelsPerMeter=0; 8%ea(|Wjg  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ^kO+NH40  
 static int filecount=0; +>}LT_  
 CString name; (E{}iq@2  
 name.Format("pict%04d.bmp",filecount++); k:QeZn(  
 name=m_Path+name; <9bfX 91  
 BITMAPFILEHEADER bfh; pRys 5/&v  
 bfh.bfReserved1=bfh.bfReserved2=0; @$aGVEcU$  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 6Lb(oY}\3  
 bfh.bfSize=54+size; ?XIB\7}  
 bfh.bfOffBits=54; 2Pm[ kD4E=  
 CFile bf; )4MM>Q  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ u _mtdB'  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); bpx ^  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Db`SNk=  
  bf.WriteHuge(lpData,size); dtT: ,&  
  bf.Close(); |8q:sr_  
  nCount++; .US=fWyrb  
 } ~~\C.6c#  
 GlobalFreePtr(lpData); !7hjA=0  
 if(nCount==1) v6 C$Y+5~  
  m_Number.Format("%d picture captured.",nCount); nmuzTFs=  
 else mfqnRPZ  
  m_Number.Format("%d pictures captured.",nCount); ;0vCZaEF  
  UpdateData(FALSE); L~+/LV  
} NHL9qL"qk  
hl]q6ZK!6  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) /wI"oHZd  
{ ZccvZl ;b  
 if(pMsg -> message == WM_KEYDOWN) 3%[;nhbA7  
 { 4=~+B z  
  if(pMsg -> wParam == VK_ESCAPE) n "bii7h  
   return TRUE; H[_i=X3-~  
  if(pMsg -> wParam == VK_RETURN)  mPL0s  
   return TRUE; >I@VHl O  
 } )! eJW(  
 return CDialog::PreTranslateMessage(pMsg); AxtmG\o>  
} D){my_ /  
48IrC_0j  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) S"4eS,5L|  
{ @xXVJWEU:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ nZ'-3  
  SaveBmp(); awv$ }EFo  
  return FALSE; `FGYc  
} {sfA$ d0  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ )Yu  
 CMenu pop; er8T:.Py  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ; I;&O5Y  
 CMenu*pMenu=pop.GetSubMenu(0); w *M&@+3I  
 pMenu->SetDefaultItem(ID_EXITICON); %E\zR/  
 CPoint pt; X- ZZLl#  
 GetCursorPos(&pt); V,h}l"  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); bFIM07  
 if(id==ID_EXITICON) 9 {wRqY  
  DeleteIcon(); Fq$r>tmV  
 else if(id==ID_EXIT) ,gpZz$Ef(  
  OnCancel(); rJ)j./c  
 return FALSE; W#P`Y< u$  
} @-ml=S7;Sz  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); vSu dT  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) KdBpfPny@  
 AddIcon(); >qz#&  
 return res; Y b=77(Q V  
} 3=Q:{  
=%B5TBG  
void CCaptureDlg::AddIcon() 5-hnk' ~  
{ Z)}UCi+/".  
 NOTIFYICONDATA data; ^) (-7H  
 data.cbSize=sizeof(NOTIFYICONDATA); B<Q)z5KK  
 CString tip; 0NeIQr1N_  
 tip.LoadString(IDS_ICONTIP); *`q?`#1&&.  
 data.hIcon=GetIcon(0); ", p5}}/  
 data.hWnd=GetSafeHwnd(); %tMx48'N  
 strcpy(data.szTip,tip); lSg[7lt  
 data.uCallbackMessage=IDM_SHELL; !:PiQ19 'u  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; -.Blj<2ah  
 data.uID=98; _%[po%]  
 Shell_NotifyIcon(NIM_ADD,&data); YF)]B|I  
 ShowWindow(SW_HIDE); mqj-/DN6*  
 bTray=TRUE; ~Pj q3etk  
} (3"N~\9m  
%.m+6 zaF  
void CCaptureDlg::DeleteIcon() ZTibF'\5N  
{ D4b-Y[/"  
 NOTIFYICONDATA data; VV{>Kq+&,v  
 data.cbSize=sizeof(NOTIFYICONDATA); aeISb83Y|  
 data.hWnd=GetSafeHwnd(); }T0O~c{$i  
 data.uID=98; PY;tu#W!%  
 Shell_NotifyIcon(NIM_DELETE,&data); R RE8|%p;B  
 ShowWindow(SW_SHOW); Sbl=U  
 SetForegroundWindow(); n)~*BpL3  
 ShowWindow(SW_SHOWNORMAL); q)mG6Su d  
 bTray=FALSE; `BQv;NtP  
} Z\$M)e8n  
-V4%f{9T3  
void CCaptureDlg::OnChange() "M, 1ElQ  
{ $~S~pvT  
 RegisterHotkey(); ~nTj't2R  
} Y hQ)M5  
ruQt0q,W3%  
BOOL CCaptureDlg::RegisterHotkey() 8qqN0"{,  
{  vTgx7gP  
 UpdateData(); _6Y+E"@zs  
 UCHAR mask=0; lXg5UrW  
 UCHAR key=0; tYXE$ i  
 if(m_bControl) J\Hv42  
  mask|=4; [ /YuI@C,@  
 if(m_bAlt) \ )=WA!  
  mask|=2; xorafL  
 if(m_bShift) qm3H/cC9+  
  mask|=1; 4EHrd;|   
  key=Key_Table[m_Key.GetCurSel()]; > 1(J  
 if(bRegistered){ hJ$9Hb  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); z)S6f79`Q  
  bRegistered=FALSE; f"KrPx!^b  
 } \XPGA uEo  
 cMask=mask; a%e`  
 cKey=key; hbOXR.0z  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Z4EmRa30 p  
 return bRegistered; veHe   
} w`;HwK$ ,  
=C2sl;7~*  
  四、小结 K Ax=C}9  
}b1FB<e]  
  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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