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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: rnP *}  
  'wjL7P I  
  一、实现方法 [orS-H7^  
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  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: Lnc>O'<5P9  
bE1@RL  
#pragma data_seg("shareddata") <KrfM  
HHOOK hHook =NULL; //钩子句柄 HFW8x9Cc  
UINT nHookCount =0; //挂接的程序数目 zXGi  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 aA=7x&z@  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 MNocXK  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Qq<+QL|  
static int KeyCount =0; kqZ+e/o>O9  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ^v&)z ,  
#pragma data_seg() l {t! LTf;  
.-}F~FES  
  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。 7;SI=  
:|N(:W>=$Y  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: f5,!,]XO  
+&.wc;mi  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR [ Mp8"  
cKey,UCHAR cMask) }5=tUfh)]'  
{ 9Bi{X_.9  
 BOOL bAdded=FALSE; A;7At!kK  
 for(int index=0;index<MAX_KEY;index++){ f vr|<3ojo  
  if(hCallWnd[index]==0){ a1g aB:w5n  
   hCallWnd[index]=hWnd; Yl"l|2 :  
   HotKey[index]=cKey; -$o4WSd~  
   HotKeyMask[index]=cMask; +t*Ks_V,*  
   bAdded=TRUE; :NXM.@jJ="  
   KeyCount++; 0l2@3}e  
   break; />dYkIv  
  } BL H~`N3U  
 } M1J77LfS8  
 return bAdded; M6H#Y2!ZbC  
} W5R /  
//删除热键 >_SqM!^v  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) fl o9iifZ  
{ -HUlB|Q8r  
 BOOL bRemoved=FALSE; A3Oe=rB  
 for(int index=0;index<MAX_KEY;index++){ ;}4^WzmK^(  
  if(hCallWnd[index]==hWnd){ #9(L/)^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ */y (~O6  
    hCallWnd[index]=NULL; #?fKi$fS;L  
    HotKey[index]=0; }S6"$R  
    HotKeyMask[index]=0; 1[4 0\sM  
    bRemoved=TRUE; aW(H n[}^  
    KeyCount--; 5?XIp6%x  
    break; /eY}0q%  
   } l 1eF&wNC  
  } % jSB9  
 } 6 B*,Mu4A  
 return bRemoved; eWWfUNBSLX  
} cCO2w2A[*  
F-PQ`@ZNW  
i^hEL2S/A  
  DLL中的钩子函数如下: BMYvxSsm  
V~fPp"F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @k3xk1*  
{ Y|~+bKa  
 BOOL bProcessed=FALSE; B;c2gu  
 if(HC_ACTION==nCode) aM|;3j1p  
 { -d_7 q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 @ ('/NjTZ  
   switch(wParam) ZiaHLpk  
   {  f]48>LRE8  
    case VK_MENU: "g:1br?X,9  
     MaskBits&=~ALTBIT; rObg:(z&\  
     break; GL'l "L  
    case VK_CONTROL: T.pc3+B8N  
     MaskBits&=~CTRLBIT; L&hv:+3N  
     break; [^0 S#,L  
    case VK_SHIFT: &*# Obv  
     MaskBits&=~SHIFTBIT; IIO-Jr  
     break; a~&euT2  
    default: //judge the key and send message nd,2EX<bE  
     break; x*! %o(G  
   } 'f-8P  
   for(int index=0;index<MAX_KEY;index++){ 7& 'p"hF  
    if(hCallWnd[index]==NULL) CkR 95*  
     continue; W]I+Rlv)U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c0QKx=  
    { N~tq ]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); D\^\_r):  
     bProcessed=TRUE; %/w%A:y#&  
    } *;[g Ga~  
   } cf,^7,-`"  
  } :: s k)  
  else if((lParam&0xc000ffff)==1){ //有键按下 B3&C=*y  
   switch(wParam) )`K!XX$%  
   { dy3fZ(=q^  
    case VK_MENU: 97vQM  
     MaskBits|=ALTBIT; -lS(W^r4  
     break; P (aN6)D  
    case VK_CONTROL: e#!p6+#"  
     MaskBits|=CTRLBIT; ..Bf-)w  
     break; zKfY0A R  
    case VK_SHIFT: c7A]\1 ~  
     MaskBits|=SHIFTBIT; [Gc9 3PA7q  
     break; t5k=ngA  
    default: //judge the key and send message w+gPU1|(r  
     break; } p `A>  
   } R5=M{  
   for(int index=0;index<MAX_KEY;index++){ !md1~g$rN  
    if(hCallWnd[index]==NULL) ,c|Ai(U  
     continue; 1F R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &M7AM"9  
    { v+C%t!dx  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); M8${&&[;  
     bProcessed=TRUE; AI]lG]q8  
    } O% 8>siU  
   } <xUX&J=;  
  } \G2PK&)F  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Bhk@0\a  
   for(int index=0;index<MAX_KEY;index++){ vngn^2  
    if(hCallWnd[index]==NULL) Dlg9PyQ  
     continue; R%6KxN)+@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) R%"'k<`#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); b1EY6'R2  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 $:D\yZ,  
   } Qn}M  
  } !d&SVS^mo  
 } kOQ!]-;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); BK1I_/_!  
} O+t'E9Fa  
{J-Ojw|Y b  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ^bECX<,H  
Bw>)gSB5$k  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yT[)V[}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \5fvD8>H  
\hP.Q;"MtO  
  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: " f.9u  
*d:$vaL  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $V;0z~&!'  
{ Z  GrDa  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) JhvT+"~  
 { aa}U87]k  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Z<#h$XUA  
  SaveBmp(); AE=E"l1]  
  return FALSE; =l>=]O~h  
 } 3[<D"0#},  
 …… //其它处理及默认处理 .f`KP!p.  
} r-,u)zf"  
rW+}3] !D/  
7=a e^GKo  
  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。 T }Wse{  
Wm/0Pi  
  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。 p5J!j I=  
sLf~o" yb  
  二、编程步骤 '?T<o  
!*o{xq   
  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 |NXibmP  
eE@7AM  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; K+`deH_d  
Px&)kEQ  
  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; T1;>qgp4b  
( ; _AP.  
  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; }O2P>Z?V  
AsR}qqG  
  5、 添加代码,编译运行程序。 o0TB>DX$`  
-m$2"_  
三、程序代码 ow;a7  
K;]Dh?  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL r`e6B!p  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) iB+ _+A  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ dv?t;D@p!  
#if _MSC_VER > 1000 Qjmo{'d  
#pragma once >J{e_C2ZS  
#endif // _MSC_VER > 1000 !\\OMAf7  
#ifndef __AFXWIN_H__ Tn?D~?a*O  
#error include 'stdafx.h' before including this file for PCH =KHX_ib  
#endif kb!W|l"PN  
#include "resource.h" // main symbols @{ L|&Mk!  
class CHookApp : public CWinApp y0'WB`hNQ  
{ g\H~Y@'{  
 public: =)J )xH!N  
  CHookApp(); @XVx{t;g2  
  // Overrides !ZY1AhGZ  
  // ClassWizard generated virtual function overrides {"O-/* f+(  
  //{{AFX_VIRTUAL(CHookApp) V!s#xXD}  
 public: F(w<YU %6  
  virtual BOOL InitInstance(); q[x|tO  
  virtual int ExitInstance(); df/7u}>9  
  //}}AFX_VIRTUAL :0p$r pJP  
  //{{AFX_MSG(CHookApp) >RrG&Wv59  
  // NOTE - the ClassWizard will add and remove member functions here. K{XE|g  
  // DO NOT EDIT what you see in these blocks of generated code ! be [E^%  
  //}}AFX_MSG ;aH3{TS  
  DECLARE_MESSAGE_MAP() 0CI\Yd=  
}; EmyE%$*T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); sHQO*[[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A2.4#Qb'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %0vWyU:K9  
BOOL InitHotkey(); lInf,Q7W  
BOOL UnInit(); WUb] 8$n  
#endif $)6x3&]P  
J 2k4k  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. sVe<l mL  
#include "stdafx.h" I(j$^DA.  
#include "hook.h" pz"}o#R"x  
#include <windowsx.h> xEufbFAN?  
#ifdef _DEBUG z7pw~Tqlz  
#define new DEBUG_NEW >b8-v~o{  
#undef THIS_FILE ?>My&yB  
static char THIS_FILE[] = __FILE__; .u]d5z BR  
#endif (UZ].+)s  
#define MAX_KEY 100 x#hSN|'"  
#define CTRLBIT 0x04 y s[z[  
#define ALTBIT 0x02 NMzq10M=6  
#define SHIFTBIT 0x01 3;AJp_;  
#pragma data_seg("shareddata") r-a0XNS*  
HHOOK hHook =NULL; }(K1=cEaL  
UINT nHookCount =0; 4h T!DS  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey { PS0.UZ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 9)uJ\NMy  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey [EK@f,iM  
static int KeyCount =0; :es=T`("A8  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift % zO>]f&  
#pragma data_seg()  u5Mg  
HINSTANCE hins; Kaji&Ibd  
void VerifyWindow(); w"L]?#  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) %eGI]!vf  
//{{AFX_MSG_MAP(CHookApp) c GyBml1  
// NOTE - the ClassWizard will add and remove mapping macros here. #q5tG\gnM  
// DO NOT EDIT what you see in these blocks of generated code! 0D0uzUD-  
//}}AFX_MSG_MAP z`,dEGfh^  
END_MESSAGE_MAP() ^-F#"i|Cn  
b"Jr_24t3v  
CHookApp::CHookApp() 1v*N]}`HU  
{ FytGg[#]  
 // TODO: add construction code here, |W}D_2  
 // Place all significant initialization in InitInstance &#OF,_6"m  
} mZ.gS1Dq  
5x!rT&!G  
CHookApp theApp; Y Azj>c&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) #"C!-kS'=  
{ "BIhd*K[~  
 BOOL bProcessed=FALSE; L1&` 3a?pL  
 if(HC_ACTION==nCode) {U4{v=,!I  
 { @X P_~ N  
  if((lParam&0xc0000000)==0xc0000000){// Key up RFq=`/>dG  
   switch(wParam) xm tD0U1  
   { y( UWh4?t  
    case VK_MENU: /l8w b~vl  
     MaskBits&=~ALTBIT; <- R%  
     break; # wyjb:Ql  
    case VK_CONTROL: t{`uN  
     MaskBits&=~CTRLBIT; Vddod  
     break; ]hRs -x  
    case VK_SHIFT: {MUO25s02  
     MaskBits&=~SHIFTBIT; olm'_ {{  
     break; y,`q6(&  
    default: //judge the key and send message 5@n|uJA  
     break; fw|t`mUGu  
   } 4tSh.qBht  
   for(int index=0;index<MAX_KEY;index++){ [8vqw(2Tm(  
    if(hCallWnd[index]==NULL) 3@* ~>H  
     continue; v!=e]w6{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Equ%6x  
    { s !I I}'Je  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); pV1 ;gqXNS  
     bProcessed=TRUE; AjsjYThV  
    } ?P}) Qa  
   } nN>Uh T  
  } u3DFgl3-7  
  else if((lParam&0xc000ffff)==1){ //Key down ;zSV~G6-  
   switch(wParam) .ts XQf  
   { S+?*l4QK  
    case VK_MENU: yr)e."#S  
     MaskBits|=ALTBIT; Np;tpq~  
     break; w1 A-_  
    case VK_CONTROL: j`_Z`eG  
     MaskBits|=CTRLBIT; swMR+F#u*  
     break; @JOsG-VW~  
    case VK_SHIFT: iphdJZ/f  
     MaskBits|=SHIFTBIT; \2Kl]G(w%y  
     break; S)"vyGv  
    default: //judge the key and send message McN'J. Sxp  
     break; ;cb='s  
   } r%LG>c`^  
   for(int index=0;index<MAX_KEY;index++) Ey_mK\'  
   { :]* =f].  
    if(hCallWnd[index]==NULL) lg@q} ]1  
     continue; FH;)5GGnv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5yp  
    { |+=ctpx9&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); vVo# nzeZ5  
     bProcessed=TRUE; HBw0 N?  
    } ON"V`_dq+M  
   } !DKl:8mx4  
  } M F$NcU  
  if(!bProcessed){ l%`~aVGJ  
   for(int index=0;index<MAX_KEY;index++){ 5jTA6s9zA  
    if(hCallWnd[index]==NULL) If|i `,Iy  
     continue; C+gu'hD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) T8vMBaU!qY  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4Q\~l(  
   } XsMETl"Av4  
  } S7CD#Y[s  
 } aQ)g7C  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <"S/M]9  
} 11JO[  
{7=k/Y*U  
BOOL InitHotkey() `y.i(~^1  
{ TJs@V>,  
 if(hHook!=NULL){ tNW0 C]  
  nHookCount++; puGy`9eKv1  
  return TRUE; AOCiIPw  
 } ||4++84{  
 else 2K2jko9'a  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); $7\hszjZ  
  if(hHook!=NULL) JI92Dc*o  
   nHookCount++; uC1v^!D  
  return (hHook!=NULL); 4$v08z Z  
} x 0L,$Ol  
BOOL UnInit() R=HcSRTkA  
{ *\[GfTL  
 if(nHookCount>1){ 3a,7lTUuB  
  nHookCount--; U,$^| Iz  
  return TRUE; ;p)fW/<  
 } _NM=9cWd  
 BOOL unhooked = UnhookWindowsHookEx(hHook); QBT_H"[  
 if(unhooked==TRUE){ GSg/I.)S  
  nHookCount=0; ]F,v#6qi  
  hHook=NULL; p"J\+R  
 } mg4: N  
 return unhooked; c::Vh  
} 6.GIUM%D  
D,'@b+B[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) i52:<< 8a  
{ Z9 tjo1X  
 BOOL bAdded=FALSE; )`]} D[j  
 for(int index=0;index<MAX_KEY;index++){ 7~ok*yGw  
  if(hCallWnd[index]==0){ p\7(IhW@  
   hCallWnd[index]=hWnd; ?QCHkhU  
   HotKey[index]=cKey; uEkUK|  
   HotKeyMask[index]=cMask; >=Un=Q%  
   bAdded=TRUE; 'B4j=K*  
   KeyCount++; BM]sW:-v  
   break; 'm+)n08[  
  } c1p*}T  
 } p)=Fi}#D\  
 return bAdded; {EGm6WSQ^  
} hSD uByoi  
'y.'Xj:l  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) c~+l|r=u?  
{ 8z, |N#  
 BOOL bRemoved=FALSE; *.9.BD9  
 for(int index=0;index<MAX_KEY;index++){ nr<&j#!L  
  if(hCallWnd[index]==hWnd){ 38T2IN  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `7zNVYur8  
    hCallWnd[index]=NULL; HLcK d`$/  
    HotKey[index]=0; Awad!_VdHS  
    HotKeyMask[index]=0; G#;$;  
    bRemoved=TRUE; Ni[2 p  
    KeyCount--; } .cP  
    break; +9mnxU>  
   } $=GZ"%ED  
  } 4#m"t?6!  
 } +<P%v k  
 return bRemoved; w;(`!^xv  
} +;Jb)8  
 w|>O!]K]  
void VerifyWindow() L{\au5-4  
{ p}NIZ)]$  
 for(int i=0;i<MAX_KEY;i++){ ;Qc_Tf=,  
  if(hCallWnd!=NULL){ GJY7vS^#  
   if(!IsWindow(hCallWnd)){ ^ cn)eA  
    hCallWnd=NULL; Y|=/*?o}  
    HotKey=0; T&=1IoOg  
    HotKeyMask=0; l1\/ `  
    KeyCount--; hYW<4{Gjr  
   } W|@/<K$V  
  } YoKY&i6r}  
 } Q2)z1'Wv  
} 3!0Eh8ncI  
o5\nqw^  
BOOL CHookApp::InitInstance() KF|<A@V  
{ zUqt^_  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); k 4+F  
 hins=AfxGetInstanceHandle(); yD+)!q"  
 InitHotkey(); &LO<!WKQ  
 return CWinApp::InitInstance(); R)"Y 40nW  
} a(Bo.T<2@  
MmBM\Dnv  
int CHookApp::ExitInstance() c_]$UM[7L  
{ =!'gV:M  
 VerifyWindow(); [{ak&{R,9{  
 UnInit(); {4g1Wr5=  
 return CWinApp::ExitInstance(); SB1\SNB  
} qh/q<  
QW.VAF\6*  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file C G~ )`  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) kEtYuf^  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ` RUr/|S  
#if _MSC_VER > 1000 ~l%Dcp  
#pragma once &>Q_  
#endif // _MSC_VER > 1000 q79)nhC F  
lM C4j  
class CCaptureDlg : public CDialog 7'_zJI^  
{ ,qak_bP  
 // Construction >A|6 kzC  
 public: #F.;N<a  
  BOOL bTray; h[%`'(  
  BOOL bRegistered; '+NmHu:q  
  BOOL RegisterHotkey(); x2.G1  
  UCHAR cKey; ^u#!Yo.!(  
  UCHAR cMask; lNQt  
  void DeleteIcon(); %O;"Z`I  
  void AddIcon(); ?'p`Qv  
  UINT nCount; L@w|2  
  void SaveBmp(); A"k6n\!n;  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 'MPt K  
  // Dialog Data '5KgRK"  
  //{{AFX_DATA(CCaptureDlg) /] ce?PPC  
  enum { IDD = IDD_CAPTURE_DIALOG }; ; )O)\__"-  
  CComboBox m_Key; 5UR$Pn2a2  
  BOOL m_bControl; D{h1"q  
  BOOL m_bAlt; @#1k+tSA,  
  BOOL m_bShift; x&tad+T  
  CString m_Path; ;RW!l pGjP  
  CString m_Number; g1L$+xD^  
  //}}AFX_DATA M~;mamTP  
  // ClassWizard generated virtual function overrides oL#^=vid"  
  //{{AFX_VIRTUAL(CCaptureDlg) qr$=oCqa  
 public: |&3m'"(  
  virtual BOOL PreTranslateMessage(MSG* pMsg); g4P059  
 protected: p-UACMN& c  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support I 6a{'c(P  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); afv? z  
  //}}AFX_VIRTUAL -]R7[5C:  
  // Implementation eHi|_3A&*  
 protected: !E,$@mvd  
  HICON m_hIcon; /K:M ,q  
  // Generated message map functions ^6mlE+WY  
  //{{AFX_MSG(CCaptureDlg) /OK.n3Tt  
  virtual BOOL OnInitDialog(); iDlIx8PI  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ]nhLv!Co  
  afx_msg void OnPaint(); Axhe9!Fm  
  afx_msg HCURSOR OnQueryDragIcon(); $[}31=0  
  virtual void OnCancel(); c~b[_J)  
  afx_msg void OnAbout(); RtGETiA\b  
  afx_msg void OnBrowse(); MQ5#6 vJ  
  afx_msg void OnChange(); a Umcs!@  
 //}}AFX_MSG %YM4x!6  
 DECLARE_MESSAGE_MAP() nM34zVy  
}; THWT\3~,  
#endif {N[IjY  
W`^'hka  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file QK<sibDI  
#include "stdafx.h" /$'tO3  
#include "Capture.h" X{P_HCd  
#include "CaptureDlg.h" F(^vD_G  
#include <windowsx.h> t8\F7F P  
#pragma comment(lib,"hook.lib") 4K[E3aA  
#ifdef _DEBUG HvN!_}[  
#define new DEBUG_NEW N\l\ M  
#undef THIS_FILE v#@"Evh7  
static char THIS_FILE[] = __FILE__; IUAx*R  
#endif UGj!I  
#define IDM_SHELL WM_USER+1 {'E%SIRZ)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }L>}_NV\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '}e_8 FS  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; L&MR%5  
class CAboutDlg : public CDialog "yXKu)_  
{ TDs=VTd@Z  
 public: *?Nrx=O*  
  CAboutDlg(); 57*z0<  
  // Dialog Data F?\XhoJ3G  
  //{{AFX_DATA(CAboutDlg) VUxuX5B3M  
  enum { IDD = IDD_ABOUTBOX }; d }=fJ  
  //}}AFX_DATA " JFx  
  // ClassWizard generated virtual function overrides [5e}A&  
  //{{AFX_VIRTUAL(CAboutDlg) !qS~YA  
 protected: g&!UaJ[#9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support x :\+{-  
  //}}AFX_VIRTUAL rCGXHbj%  
  // Implementation 9+ nB;vA  
 protected: BaZ$pO^  
  //{{AFX_MSG(CAboutDlg) U<gM gA  
  //}}AFX_MSG K#_&}C^-jY  
  DECLARE_MESSAGE_MAP() %O B:lAeJ  
}; '#!nK O2<  
rn $a)^!  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) u,AP$+Qk  
{ FkY}6  
 //{{AFX_DATA_INIT(CAboutDlg) n^B9Mh @  
 //}}AFX_DATA_INIT >lQ@" U  
} 83K)j"!<X  
qq.M]?Z  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) L[lX?g?Ob  
{  (-Cxv`7  
 CDialog::DoDataExchange(pDX); `-fWNHs  
 //{{AFX_DATA_MAP(CAboutDlg) :+NZW9_  
 //}}AFX_DATA_MAP ?g^42IYG  
} _HF66)X7  
$9+|_[ ]v.  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) YbtsJ <w  
 //{{AFX_MSG_MAP(CAboutDlg) w^z5O6   
 // No message handlers WJWi'|C4  
 //}}AFX_MSG_MAP k#F |  
END_MESSAGE_MAP() (VD Y]Q)  
(StX1g'  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 7OAM  
: CDialog(CCaptureDlg::IDD, pParent) @W}cM  
{ -fpe  
 //{{AFX_DATA_INIT(CCaptureDlg) $`j%z@[g  
  m_bControl = FALSE; p 4_j>JPv5  
  m_bAlt = FALSE; c?5?TJpm  
  m_bShift = FALSE; $inlI_  
  m_Path = _T("c:\\"); ^POHQQ  
  m_Number = _T("0 picture captured."); aItQ(+y  
  nCount=0; z^lcc7  
  bRegistered=FALSE; }`KK  
  bTray=FALSE; Drm#z05i[g  
 //}}AFX_DATA_INIT SU ,G0.  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]1hyvm3  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &O +?#3  
} i>z_6Gax*[  
eH HY.^|  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) "<Ozoo1&w  
{ u7&q(Z&&O  
 CDialog::DoDataExchange(pDX); 5aj%<r  
 //{{AFX_DATA_MAP(CCaptureDlg) yFoPCA86y  
  DDX_Control(pDX, IDC_KEY, m_Key); l266ufO.u-  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 4)"S /u  
  DDX_Check(pDX, IDC_ALT, m_bAlt); U#V&=~-  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); wZ4w`|'  
  DDX_Text(pDX, IDC_PATH, m_Path); CvhVV"n  
  DDX_Text(pDX, IDC_NUMBER, m_Number); &F- \t5X=i  
 //}}AFX_DATA_MAP :@uIEvD?  
} 6am g*=]  
"QD>m7  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) E1r-$gf_  
//{{AFX_MSG_MAP(CCaptureDlg) GP>\3@>  
 ON_WM_SYSCOMMAND() @C-03`JWuK  
 ON_WM_PAINT() @E 8P>kq  
 ON_WM_QUERYDRAGICON() .n n&K}h  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) <%o9*)F  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) xKR\w!+Z'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) l~]D|92  
//}}AFX_MSG_MAP LZ34x: ,C  
END_MESSAGE_MAP() xi51,y+(5  
[rkw k\m*  
BOOL CCaptureDlg::OnInitDialog() >.M>,m\  
{ Rh}}8 sv  
 CDialog::OnInitDialog(); VV;%q3}:  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); {xAd>fGG+y  
 ASSERT(IDM_ABOUTBOX < 0xF000); yk y% +@2q  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 7nm'v'\u+V  
 if (pSysMenu != NULL) }* \*<d 3  
 { :8K}e]!c1  
  CString strAboutMenu; WBD?|Ss  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Lqdapx"Z_  
  if (!strAboutMenu.IsEmpty()) OlB9z  
  { It7R}0Smg  
   pSysMenu->AppendMenu(MF_SEPARATOR); ,Nt^$2DZW  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); HfZ^ED"}  
  } Xp] jF^5  
 } [^Bjmw[7  
 SetIcon(m_hIcon, TRUE); // Set big icon m]vS"AdX  
 SetIcon(m_hIcon, FALSE); // Set small icon )s,LFIy<A  
 m_Key.SetCurSel(0); lb$_$+@Vr  
 RegisterHotkey(); Vm8@ LA  
 CMenu* pMenu=GetSystemMenu(FALSE); ;yajt\a  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); W]oa7VAq  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4Q/{lqG  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ,PmUl=  
 return TRUE; // return TRUE unless you set the focus to a control /vq$/  
} 8v z h5,U  
e!PB3I  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) c7~R0nP  
{ PtYG%/s  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Fgi`g{N  
 { WW.@&#S5  
  CAboutDlg dlgAbout; U(0FL6sPC  
  dlgAbout.DoModal(); 5JhvYsf3_  
 } Y0.'u{J*  
 else Fsm6gE`|n  
 { *L9v(Kc  
  CDialog::OnSysCommand(nID, lParam);  63 'X#S  
 } >s 6ye  
} O!%T<2i3  
J^`5L7CO  
void CCaptureDlg::OnPaint() `3 i<jZMG  
{ H<[~V0=  
 if (IsIconic()) h}! 9?:E  
 { 9@ YKx0  
  CPaintDC dc(this); // device context for painting "!D y[J  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ymyzbE  
  // Center icon in client rectangle #GLW3}  
  int cxIcon = GetSystemMetrics(SM_CXICON); FLs$  
  int cyIcon = GetSystemMetrics(SM_CYICON); %s"& |32  
  CRect rect; :IU7dpwDl  
  GetClientRect(&rect); /W)A[jR  
  int x = (rect.Width() - cxIcon + 1) / 2; EwX&Cj".  
  int y = (rect.Height() - cyIcon + 1) / 2; yw$4Hlj5  
  // Draw the icon hiBsksZRnk  
  dc.DrawIcon(x, y, m_hIcon); +^lB"OcOX@  
 } h Fik>B#!  
 else 'Gqv`rq&  
 { ) jH`lY)1  
  CDialog::OnPaint(); 7]xDMu'^&f  
 } ')!X1A{  
} >iae2W`  
8'zZVX D<  
HCURSOR CCaptureDlg::OnQueryDragIcon() -z~!%4 a  
{ <|4$T H^ t  
 return (HCURSOR) m_hIcon; E#!!tH`lgg  
} sde>LZet/  
Hl0" zS[  
void CCaptureDlg::OnCancel() .Zczya  
{ NDP" @  
 if(bTray) 3y6\0|{1  
  DeleteIcon(); UMR?q0J  
  CDialog::OnCancel(); HKXC=^}x'  
} d(o=)!p  
]~I+d/k d  
void CCaptureDlg::OnAbout() )Q'E^[Ua  
{ 0SQr%:zG  
 CAboutDlg dlg; x{SlJ%V  
 dlg.DoModal(); e4YP$}_L  
} = 'NV3by  
k?14'X*7yu  
void CCaptureDlg::OnBrowse() 3NtUB;!  
{ Gv &G2^  
 CString str; ^obuMQ;  
 BROWSEINFO bi; Y/kq!)u;%L  
 char name[MAX_PATH]; ;"Kgg:K>W  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); :J`@@H  
 bi.hwndOwner=GetSafeHwnd(); H\R a*EO~j  
 bi.pszDisplayName=name; (QiA5!wg  
 bi.lpszTitle="Select folder"; MqnUym  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; qT@h/Y  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); "Gp[.=.z?  
 if(idl==NULL) eo0-aHs  
  return; [j+:2@  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Reikf}9Q  
 str.ReleaseBuffer(); x,,y}_YX  
 m_Path=str; /h0bBP  
 if(str.GetAt(str.GetLength()-1)!='\\') |6*Bu1  
  m_Path+="\\"; \b"rf697 ,  
 UpdateData(FALSE); `F7]M  
} B`B =bn+4  
L/"};VI  
void CCaptureDlg::SaveBmp() ,x8;| o5  
{ bQt:=>  
 CDC dc; X_TjJmc  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); y&zFS4"x  
 CBitmap bm; 'Rn-SD~gIr  
 int Width=GetSystemMetrics(SM_CXSCREEN); e^Zm09J  
 int Height=GetSystemMetrics(SM_CYSCREEN); \Fz9O-jb4  
 bm.CreateCompatibleBitmap(&dc,Width,Height); zeHF-_{  
 CDC tdc; y|5s  
 tdc.CreateCompatibleDC(&dc); D~6[C:m  
 CBitmap*pOld=tdc.SelectObject(&bm); I\. |\^  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); d. wGO]"  
 tdc.SelectObject(pOld); OUv<a `0  
 BITMAP btm; >!=@TK(~  
 bm.GetBitmap(&btm); {]HiTpn  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; }%_|k^t  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); f$o^Xu  
 BITMAPINFOHEADER bih; AByl1)r|  
 bih.biBitCount=btm.bmBitsPixel; ,9P-<P  
 bih.biClrImportant=0; $o[-xNn1  
 bih.biClrUsed=0; 0|P=S|%~  
 bih.biCompression=0; +Q5 O$8i  
 bih.biHeight=btm.bmHeight; p;+O/'/j  
 bih.biPlanes=1; #rlgeHG!fs  
 bih.biSize=sizeof(BITMAPINFOHEADER); u&:N`f  
 bih.biSizeImage=size; \;{ ]YX  
 bih.biWidth=btm.bmWidth; <Ua~+U(FR0  
 bih.biXPelsPerMeter=0; y]j.PT`Cw  
 bih.biYPelsPerMeter=0; v Y[s#*+  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); yLa@27T\A  
 static int filecount=0; axC|,8~tq  
 CString name; }_D.Hy5  
 name.Format("pict%04d.bmp",filecount++); C%o|}iv"  
 name=m_Path+name; #A/OGi  
 BITMAPFILEHEADER bfh; ppAbG,7  
 bfh.bfReserved1=bfh.bfReserved2=0; `|'w]rj:"+  
 bfh.bfType=((WORD)('M'<< 8)|'B'); S<nF>JRJa  
 bfh.bfSize=54+size; @Q74  
 bfh.bfOffBits=54; t+?Bb7p,H  
 CFile bf; WPNB!" E98  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ cgb>Naa<  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); YdhTjvx  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 51k}LH  
  bf.WriteHuge(lpData,size); *qpu!z2m||  
  bf.Close(); z=D5*  
  nCount++; :aNjh  
 } o*KAS@&  
 GlobalFreePtr(lpData); )d3 09O  
 if(nCount==1) 8+'}`  
  m_Number.Format("%d picture captured.",nCount); t!?`2Z5  
 else ,&o9\|ih7]  
  m_Number.Format("%d pictures captured.",nCount); EG{+Sz  
  UpdateData(FALSE); 1w>[&#7  
} iuV4xyp  
SyL"Bmi  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) zIc6L3w$  
{ 8SjCU+V  
 if(pMsg -> message == WM_KEYDOWN) Id=20og  
 { iJTG +gx  
  if(pMsg -> wParam == VK_ESCAPE) 4E''pW]8  
   return TRUE; L=<xTbY  
  if(pMsg -> wParam == VK_RETURN) .}dLqw  
   return TRUE; 7U [C=NL  
 } {Ydhplg{  
 return CDialog::PreTranslateMessage(pMsg); ZX_QnSNZ?  
} \]x`f3F  
3! P^?[p3  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7F"ljkN1S  
{ {\$S585  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >k @t.PeoV  
  SaveBmp(); ?'V78N sA  
  return FALSE; 4phCn5  
} @fd<  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ #aqnj+  
 CMenu pop; h[(YH ;Y  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); |gk*{3~y  
 CMenu*pMenu=pop.GetSubMenu(0); Q=Q+*oog  
 pMenu->SetDefaultItem(ID_EXITICON); "5JMk -2k  
 CPoint pt;  V FM[-  
 GetCursorPos(&pt); BFNO yv  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); W 8<QgpV*  
 if(id==ID_EXITICON) I]ej ]46K  
  DeleteIcon(); i3 js'?7E  
 else if(id==ID_EXIT) KE\>T:  
  OnCancel(); :lu!%p<$  
 return FALSE; 2?,l r2  
} <(E)M@2  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); }%KQrlbHJl  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) VmQ^F| {  
 AddIcon(); RlfI]uCDM  
 return res; i%yKyfD  
} %[n5mF*`  
%\it4 r3  
void CCaptureDlg::AddIcon() Qe~C}j%  
{ eGMw:H  
 NOTIFYICONDATA data; `_ ^I 2  
 data.cbSize=sizeof(NOTIFYICONDATA); PCCE+wC6  
 CString tip; _3 !s{  
 tip.LoadString(IDS_ICONTIP); IiKU =^~w  
 data.hIcon=GetIcon(0); @G& oUhS  
 data.hWnd=GetSafeHwnd(); :{w3l O  
 strcpy(data.szTip,tip); <,Gjo]z  
 data.uCallbackMessage=IDM_SHELL; 1dr g5  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; K81FKV.  
 data.uID=98; @kd$.7Y9  
 Shell_NotifyIcon(NIM_ADD,&data); qLBQ!>lR  
 ShowWindow(SW_HIDE); S*r }oX0  
 bTray=TRUE; SP0ueAa}  
} P'$2%P$8:~  
$zz4A~   
void CCaptureDlg::DeleteIcon() C4E*q3[Y  
{ r0z8?  
 NOTIFYICONDATA data; P'}EZ'  
 data.cbSize=sizeof(NOTIFYICONDATA); ;180ct4  
 data.hWnd=GetSafeHwnd(); &*Z)[Bl  
 data.uID=98; QKk7"2t|  
 Shell_NotifyIcon(NIM_DELETE,&data); Sn97DCdk  
 ShowWindow(SW_SHOW); *`s*l+0b  
 SetForegroundWindow(); *"|f!t  
 ShowWindow(SW_SHOWNORMAL); m[ S1  
 bTray=FALSE; .:-*89c  
} B"7~[,he  
j;Z hI y  
void CCaptureDlg::OnChange() SOD3MsAK  
{ ][f0ZMa  
 RegisterHotkey(); M7DoAS{6e  
} rl"yE=  
:>y5'q@R  
BOOL CCaptureDlg::RegisterHotkey() hzV%QDUpe  
{ T5[(vTp  
 UpdateData(); zPvTRW~H\  
 UCHAR mask=0; CyS.GdyP  
 UCHAR key=0; d.snD)X  
 if(m_bControl) H8c -/  
  mask|=4; "t{D5{q|[k  
 if(m_bAlt) UuJ gB)  
  mask|=2; *@ \LS!N  
 if(m_bShift) WAr6Dv,8  
  mask|=1; FOa2VP%  
  key=Key_Table[m_Key.GetCurSel()]; -z/>W+k  
 if(bRegistered){ o>M&C X+j$  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \n0Gr\:  
  bRegistered=FALSE; ;S2/n$Ju_  
 } O sIvW'$\  
 cMask=mask; f <DqA/$  
 cKey=key; pr"q-S>E  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); r2;+ACwWf_  
 return bRegistered; *fDhNmQ `  
} =sXk,I;  
6r5<uZ9w_X  
  四、小结 ^@maF<Jb  
orF8%  
  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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