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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: unvS`>)Np  
  3kz O VZ  
  一、实现方法 V |cPAT%  
:;Xh`br  
  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: \JLea$TM:  
)gVz?-u+D  
#pragma data_seg("shareddata") yOTC>?p%  
HHOOK hHook =NULL; //钩子句柄 D/)E[Fv+  
UINT nHookCount =0; //挂接的程序数目 E[NszM[P  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 nixIKOnjC  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 KOhK#t>H@0  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey K0A[xkX6  
static int KeyCount =0; u~8=ik n+T  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 %p;;aZG  
#pragma data_seg() `eEiSf  
B=}s7$^  
  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。 J.(mg D  
<s=i5t My5  
  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: DFMf" _p  
%w#z   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR H-iCaXT  
cKey,UCHAR cMask) {zIcEN$ ~  
{ ##6u  
 BOOL bAdded=FALSE; Ak kth*p  
 for(int index=0;index<MAX_KEY;index++){ tP1znJh>y  
  if(hCallWnd[index]==0){ oM^VtH=>  
   hCallWnd[index]=hWnd; >PYc57S1c  
   HotKey[index]=cKey; }D]y -BbA.  
   HotKeyMask[index]=cMask; j4wsDtmAU  
   bAdded=TRUE; " M3S  
   KeyCount++; A'aYH`j  
   break; sK@]|9ciQ  
  } dv cLZK  
 } 50e vWD  
 return bAdded; 3~%M4(  
} :sX4hZK =G  
//删除热键 9 lXnNK |]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) qTz5P  
{ 9\Md.>  
 BOOL bRemoved=FALSE; 1\aV4T  
 for(int index=0;index<MAX_KEY;index++){ K BlJJH`z{  
  if(hCallWnd[index]==hWnd){ $9@3dM*E?Z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ PDpuHHB  
    hCallWnd[index]=NULL; GYrUB59  
    HotKey[index]=0; 4(? Z1S  
    HotKeyMask[index]=0; cTja<*W^xv  
    bRemoved=TRUE; KFBBqP  
    KeyCount--; *X!+wK-+  
    break; soOfk!b  
   } 4axuE]  
  } t>vr3)W  
 } mtf><YU  
 return bRemoved; 1RauI0d*  
} #y8Esik  
|RH^|2:x9Q  
j9/hZqo  
  DLL中的钩子函数如下: b63DD(  
XnKf<|j6k  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [:/mjO K  
{ ky{@*fg.  
 BOOL bProcessed=FALSE; 1()pKBHf  
 if(HC_ACTION==nCode) T"e"?JSRJ  
 { )TcD-Jr  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 'soll[J  
   switch(wParam) C:_-F3|]cJ  
   {  MKh}2B#S  
    case VK_MENU: &8dj*!4H  
     MaskBits&=~ALTBIT; 62o nMY  
     break; J u"/#@  
    case VK_CONTROL: [U,hb1Wi3  
     MaskBits&=~CTRLBIT; )`#SMLMy~  
     break; (g>&ov(d  
    case VK_SHIFT: ll ^I ;o0  
     MaskBits&=~SHIFTBIT; a|ZJzuqo  
     break; XzW\p8D^u  
    default: //judge the key and send message L*6>S_l[  
     break; lvG+9e3+  
   } bSW~hyI w  
   for(int index=0;index<MAX_KEY;index++){ 8w ]'U  
    if(hCallWnd[index]==NULL) 3 jghV?I{T  
     continue; &23{(]eO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }}LjEOvL=  
    { CpU y~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $'w>doUlA  
     bProcessed=TRUE; Yq:+.UU  
    } l]L"Ex{  
   } $VeQvm*  
  } L;U?s2&Y  
  else if((lParam&0xc000ffff)==1){ //有键按下 $*j)ey>  
   switch(wParam) t; @T~%  
   { Dc3bG@K*G  
    case VK_MENU: @Ll^ze&HI  
     MaskBits|=ALTBIT; .X"\ Mg  
     break; ^@$T>SB1  
    case VK_CONTROL: |H%,>r`9S  
     MaskBits|=CTRLBIT; VO<P9g$UD  
     break; ~Efi|A/  
    case VK_SHIFT: C}71SlN'M  
     MaskBits|=SHIFTBIT; t?FPmbj v  
     break; W . dm1  
    default: //judge the key and send message >Ft:&N9L{  
     break; ={I(i6  
   } [ z{ }?  
   for(int index=0;index<MAX_KEY;index++){ 8p]Krs:  
    if(hCallWnd[index]==NULL) "4CO^ B  
     continue; rs@qC>_C0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `jT1R!$3F  
    { qSQsY:]j0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); t x1(6V&l;  
     bProcessed=TRUE; zLjQ,Lp.I  
    } 4EJ6Zy![0*  
   } 5Y5N   
  } w_#5Na}>d  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ?V})2wwP  
   for(int index=0;index<MAX_KEY;index++){ m$bNQ7  
    if(hCallWnd[index]==NULL) %`j2?rn  
     continue; N lB%Qu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) b|U3\Fmc  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); b(_PV#@$  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 5xc-MkIRL  
   } `IK3e9QpcA  
  } R-5e9vyS  
 } /&RS+By(i  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9]|G-cyt  
} Tl*FK?)MC^  
;CA7\&L>  
  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: nn/_>%Y  
gX]'RBTb  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Lu~M=Fh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); SA.,Q~_T7  
G=>LW1E|  
  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: h|.*V$3  
=mh)b]].4\  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6}q# c  
{ $1myf Z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ^qPS&G  
 { Ok_)C+o  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 #zKF/H|_R  
  SaveBmp(); -;U3$[T,J7  
  return FALSE; XD|vB+j\O  
 } U=ie| 3  
 …… //其它处理及默认处理 v,mn=Q&9  
} / Hexv#3  
u )KtvC!  
|79n 1;+\?  
  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。 lISu[{b?  
3EX41)u  
  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。 \"mL LnK?  
|I=\+P}s  
  二、编程步骤 )-d &XN7  
QfsTUAfR  
  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"; e[J0+ x#;r  
{1]Of'x'  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ZTP&*+d  
8(0q,7)y  
  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; A[X~:p.^G  
2bt2h.a  
  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; ;Z}V}B  
qEB]Tj e[  
  5、 添加代码,编译运行程序。 .\b# 0w  
\S"YLRn"  
三、程序代码 9h 0^_|"  
/(skIvE|  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL `xd{0EvF  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) hh"=|c  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ P6o-H$ a+  
#if _MSC_VER > 1000  IQCIc@5  
#pragma once )6Qk|gIu(  
#endif // _MSC_VER > 1000 ue#Y h  
#ifndef __AFXWIN_H__ r!J?Lc])8  
#error include 'stdafx.h' before including this file for PCH )qx,>PL  
#endif }u8D5Q<(  
#include "resource.h" // main symbols GHo=)NTjy  
class CHookApp : public CWinApp t /CE,DQ  
{ -4'yC_8t  
 public: KRh95B GU  
  CHookApp(); IBr|A  
  // Overrides zq&,KZ  
  // ClassWizard generated virtual function overrides [vY? !  
  //{{AFX_VIRTUAL(CHookApp) x'wT%/hp  
 public: 3ws}E6\D  
  virtual BOOL InitInstance(); Z CS{D  
  virtual int ExitInstance(); 6s|4'!  
  //}}AFX_VIRTUAL tL~?)2uEN  
  //{{AFX_MSG(CHookApp) 1?bX$$y l;  
  // NOTE - the ClassWizard will add and remove member functions here.  *$o{+YP  
  // DO NOT EDIT what you see in these blocks of generated code ! . ;q 4<_  
  //}}AFX_MSG :]oRx  
  DECLARE_MESSAGE_MAP() b_T?jCyW  
}; fdRw:K8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); G' 'l,\3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h_:|H8t;w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1V37% D  
BOOL InitHotkey(); &r Lg/UEV-  
BOOL UnInit(); $zuemjW3p  
#endif ?Em*yc@WD  
GP\Pk/E  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. uM<6][^`  
#include "stdafx.h" #D&]5"0cX  
#include "hook.h" D#n^U `\if  
#include <windowsx.h> )pA N_e"  
#ifdef _DEBUG yPqZ ,  
#define new DEBUG_NEW 9@."Y>1G  
#undef THIS_FILE +aWI"d--h  
static char THIS_FILE[] = __FILE__; uk~4R@=&H  
#endif ;/8oP ;X2  
#define MAX_KEY 100 __,1;=  
#define CTRLBIT 0x04 1 k}U+  
#define ALTBIT 0x02 + B#3!  
#define SHIFTBIT 0x01 @fWmz,Ngl  
#pragma data_seg("shareddata") UR&Uwa&.  
HHOOK hHook =NULL; c~+;P(>  
UINT nHookCount =0; Z'~yUo=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey v8xNtUxN  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 6T5nr  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey EK6fd#J?1  
static int KeyCount =0; :}Tw+S5  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift d= -/'_'  
#pragma data_seg() $6X CHVx  
HINSTANCE hins; N3Jfp3_b@  
void VerifyWindow(); d M&BnI  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) '<C I^5^  
//{{AFX_MSG_MAP(CHookApp) |NcfR"[c  
// NOTE - the ClassWizard will add and remove mapping macros here. Y(4#b`k3  
// DO NOT EDIT what you see in these blocks of generated code! '_~=C-g  
//}}AFX_MSG_MAP Ex ?)FL$4  
END_MESSAGE_MAP() `_6!nk q8  
{{?[b^  
CHookApp::CHookApp() @,63%  
{ b1}P3W  
 // TODO: add construction code here, <|s9@;(I  
 // Place all significant initialization in InitInstance nKJJ7 R L  
} uYPdmrPB?l  
bX:ARe O  
CHookApp theApp; ^< ,Np+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Jk)^6  
{ $#dPM*E  
 BOOL bProcessed=FALSE; E:N~c'k  
 if(HC_ACTION==nCode) +FWkhmTv  
 { Gv!* Qk4  
  if((lParam&0xc0000000)==0xc0000000){// Key up r2T-=XWB  
   switch(wParam) / W}Za&]  
   { 0.+"K}  
    case VK_MENU: P{eL;^I  
     MaskBits&=~ALTBIT; !S[8w9q  
     break; tIgKnKr^)  
    case VK_CONTROL: #KonVM(`  
     MaskBits&=~CTRLBIT; f.`noZN  
     break; -O2ZrJ!q  
    case VK_SHIFT: O7shY4Sr  
     MaskBits&=~SHIFTBIT; T3o}%wGW  
     break; 'Dq!o[2y  
    default: //judge the key and send message BC0T[o(f8  
     break; x8 sSb:N  
   } (L?fYSP!  
   for(int index=0;index<MAX_KEY;index++){ JU7EC~7|2c  
    if(hCallWnd[index]==NULL) kne{Tp  
     continue; g(\FG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 63d' fgVp  
    { L[d 7@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Y#_,Ig5.  
     bProcessed=TRUE; )~<8j  
    } .,pGW8Js  
   } > ln%3 =  
  } 9d4PH  
  else if((lParam&0xc000ffff)==1){ //Key down v ?)-KtX|  
   switch(wParam) )g:\N8AZK  
   { ;$G.?r  
    case VK_MENU: M`ETH8Su=  
     MaskBits|=ALTBIT; nBGFa  
     break; SLL%XF~/Sb  
    case VK_CONTROL: J'O</o@e  
     MaskBits|=CTRLBIT; Z@=1-l  
     break; wj/\ !V!  
    case VK_SHIFT: (z0S5#g ,x  
     MaskBits|=SHIFTBIT; =Uta5$\a)  
     break; LqTyE  
    default: //judge the key and send message A e&t#,)  
     break; 8 kw`=wSH>  
   } [Z484dS`_  
   for(int index=0;index<MAX_KEY;index++) s#ijpc>h  
   { Z;bzp3v  
    if(hCallWnd[index]==NULL) =N`"%T@=  
     continue; c~(+#a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N %-Cp)  
    { \iAkF`OC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); rLNo7i  
     bProcessed=TRUE; g*b`V{/Vw  
    } ] 5lp.#EB  
   } k+2~=#  
  } mvI[=e*  
  if(!bProcessed){ w4 <FC$  
   for(int index=0;index<MAX_KEY;index++){ oBr/CW  
    if(hCallWnd[index]==NULL) (b Q1,y  
     continue; P=eVp(/x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) FFl[[(`%D  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <J@Y=#G$2  
   } W6D|Rr.q  
  } ow*) 1eo  
 } w{Wz^=';  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  /E/J<  
} etj8M y6=  
;BqYhi  
BOOL InitHotkey() "jzU`  
{ bort2k  
 if(hHook!=NULL){ jQzq(oDQw  
  nHookCount++; rl9YB %P  
  return TRUE; AoL4#.r3H  
 } [Z|R-{"  
 else V2cLwQ'0  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); s)#FqB8  
  if(hHook!=NULL) &IM;Yl  
   nHookCount++; (Bd8@}\u_  
  return (hHook!=NULL); mc;Z#"kf  
} - *!R  
BOOL UnInit() y~An'+yBa  
{ 9D:p~_"g  
 if(nHookCount>1){ jpZ, $  
  nHookCount--; ;sCf2TD,_  
  return TRUE; \5 IB/ *  
 } ^ElUU?rX  
 BOOL unhooked = UnhookWindowsHookEx(hHook); W F<`CQg[  
 if(unhooked==TRUE){ 4df)?/  
  nHookCount=0; =vMFCp;mv  
  hHook=NULL; {,tEe'H7  
 } u?Jw)`  
 return unhooked; n1 `D:XrE  
} W~E%Eq3  
/=A?O\B7  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ('pNAn!]  
{ t\E#8  
 BOOL bAdded=FALSE; %geiJ z  
 for(int index=0;index<MAX_KEY;index++){ T>s~bIzL*e  
  if(hCallWnd[index]==0){ :l8n)O3  
   hCallWnd[index]=hWnd; D ::),,  
   HotKey[index]=cKey; R>U0W{1NO  
   HotKeyMask[index]=cMask; W/9dT^1y4'  
   bAdded=TRUE; NS @j`6/U  
   KeyCount++; -;cZW.<  
   break; C1^=se  
  } 7A?~a_Ep  
 } 1GKd*z  
 return bAdded; [!p>Id  
} -?`^^ v  
cq+|fg~Yy  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6Y0k}+j|>E  
{ SuU,SE'TX  
 BOOL bRemoved=FALSE; n=l>d#}$%T  
 for(int index=0;index<MAX_KEY;index++){ J`a$"G B.  
  if(hCallWnd[index]==hWnd){ %N_5p'W  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [ !/u,  
    hCallWnd[index]=NULL; Y&KI/]ly,L  
    HotKey[index]=0; \ni?_F(Y  
    HotKeyMask[index]=0; A;n3""  
    bRemoved=TRUE; PjNOeI@G  
    KeyCount--; wgxr8;8`q  
    break; "2q}G16K  
   }  fy" q  
  } 6/Y3#d  
 } 6gV-u~j[#  
 return bRemoved; St9W{  
} fqA\Rp6Z  
Ahk6{uz  
void VerifyWindow() Nw[TP G5  
{ rk:^^r>5Qi  
 for(int i=0;i<MAX_KEY;i++){ ^WQ.' G5Q  
  if(hCallWnd!=NULL){ #qY`xH'>  
   if(!IsWindow(hCallWnd)){ hp+=UnW  
    hCallWnd=NULL; )isz }?Dj  
    HotKey=0; NpqMdd   
    HotKeyMask=0; B-PN +P2  
    KeyCount--; -/rP0h5#  
   } /]m5HW(P7K  
  } S0\QZ/je  
 } U8qb2'a8  
} ^.)oQo SE  
F8mS5oB|^  
BOOL CHookApp::InitInstance() p;cNmMm  
{ :,%~R2  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); $(B|$e^:(  
 hins=AfxGetInstanceHandle(); ^N#B( F  
 InitHotkey(); \=PnC}7I  
 return CWinApp::InitInstance(); Wsya:9|  
} {Qbg'|HO=l  
7{>mm$^|V  
int CHookApp::ExitInstance() 9$ZQuHSw 7  
{ 8&<C.n KP  
 VerifyWindow(); &SuWmtq  
 UnInit(); _Y@vO  
 return CWinApp::ExitInstance(); W5 ^eCYHoi  
} r:0F("},  
z5`AJrj%  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *Z'*^Y1le  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) V .+ mK|)  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4H'\nsM  
#if _MSC_VER > 1000 x9Um4!/t  
#pragma once }-QFMPXhG  
#endif // _MSC_VER > 1000 I^S gWC  
0'q&7 MV  
class CCaptureDlg : public CDialog E{x<P0 ;  
{ vYb.Ub+  
 // Construction D*.U?  
 public: 0Cd )w4C  
  BOOL bTray; h=h4`uA9  
  BOOL bRegistered; 2GeJ\1k  
  BOOL RegisterHotkey(); art L  
  UCHAR cKey; L kYcAY$w  
  UCHAR cMask; |j:"n3~6  
  void DeleteIcon(); }2c)UQD8  
  void AddIcon(); WjLy7&  
  UINT nCount; $Y'}wB{pc  
  void SaveBmp(); F6XrJ?JM  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7[=*#7}.  
  // Dialog Data e$kBpG"D  
  //{{AFX_DATA(CCaptureDlg) c"HB7  
  enum { IDD = IDD_CAPTURE_DIALOG }; 'w//d $+G_  
  CComboBox m_Key; <% #Dwo}  
  BOOL m_bControl; xVYy`_|  
  BOOL m_bAlt; F[am2[/<A  
  BOOL m_bShift; NMJX `  
  CString m_Path; w]<V~X  
  CString m_Number; V$wW?+V  
  //}}AFX_DATA 2OT RP4U  
  // ClassWizard generated virtual function overrides 6L5j  
  //{{AFX_VIRTUAL(CCaptureDlg) Q8-;w{%  
 public: N,kPR  
  virtual BOOL PreTranslateMessage(MSG* pMsg); i/UDda"E  
 protected: J:W|2U="  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support E%Tpby}^'  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 4-j3&(  
  //}}AFX_VIRTUAL 24{Tl q3  
  // Implementation -DAkVFsN  
 protected: uBpnfIe  
  HICON m_hIcon; @ ;T|`Y=7  
  // Generated message map functions b0X<)1O  
  //{{AFX_MSG(CCaptureDlg) b;Nm$`2  
  virtual BOOL OnInitDialog(); U-^qVlw  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam);  vVvx g0  
  afx_msg void OnPaint(); _{Z!$q6,  
  afx_msg HCURSOR OnQueryDragIcon(); ?X $#J'U;  
  virtual void OnCancel(); l$[7 pM[  
  afx_msg void OnAbout(); lL8pIcQW  
  afx_msg void OnBrowse(); rK` x<  
  afx_msg void OnChange(); P ?^h  
 //}}AFX_MSG  SXqWq  
 DECLARE_MESSAGE_MAP() f6/<lSoW  
}; BQWhTS7  
#endif yV"k:_O{  
r_R( kns  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file GgT 5'e;N  
#include "stdafx.h" y5@#le M  
#include "Capture.h" ws/e~ T<c  
#include "CaptureDlg.h" # <?igtUO  
#include <windowsx.h> QK~44;LVIJ  
#pragma comment(lib,"hook.lib") FS'|e?WU  
#ifdef _DEBUG 8-#_xsZ^;  
#define new DEBUG_NEW b@v_db]|t.  
#undef THIS_FILE q8Jhs7fv  
static char THIS_FILE[] = __FILE__; "rl(%~Op  
#endif "aL.`^.  
#define IDM_SHELL WM_USER+1 x."R_>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {beu  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?.{SYaS  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 90"&KDh  
class CAboutDlg : public CDialog |.#G G7F^S  
{ nj1TX  
 public: I8x,8}o>V  
  CAboutDlg(); w]@H]>sHd  
  // Dialog Data jm ORKX+)  
  //{{AFX_DATA(CAboutDlg) ?T1vc  
  enum { IDD = IDD_ABOUTBOX }; q g2 fTe  
  //}}AFX_DATA og[cwa_  
  // ClassWizard generated virtual function overrides ~`Y!_'(x  
  //{{AFX_VIRTUAL(CAboutDlg) 1j_gQ,'20  
 protected: o}4~CN9}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *VX"_C0Jy=  
  //}}AFX_VIRTUAL !l(D0 C  
  // Implementation ?8U#,qq#`  
 protected: s7d4)A%  
  //{{AFX_MSG(CAboutDlg) ?d!*[Ke8  
  //}}AFX_MSG ?2(5 2?cJ  
  DECLARE_MESSAGE_MAP() !+FrU'^  
}; Q6 oM$qiM  
0-P,zkK_v  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) u+7S/9q8  
{ REg&[e+%  
 //{{AFX_DATA_INIT(CAboutDlg) n[K LY!  
 //}}AFX_DATA_INIT bmzY^ %a  
} | V: 9 ][\  
:kMF.9U:  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) W(jOD,QMB  
{ }/bxe0px  
 CDialog::DoDataExchange(pDX); 1a gNwFd~  
 //{{AFX_DATA_MAP(CAboutDlg) )5[OG7/g  
 //}}AFX_DATA_MAP c 80Ffq  
} oBS m>V  
F$sDmk#  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +^<s'  
 //{{AFX_MSG_MAP(CAboutDlg) H:#sf][&,L  
 // No message handlers !kxJ&VmeF  
 //}}AFX_MSG_MAP =vs]Kmm  
END_MESSAGE_MAP() @=ro/.  
+$YH dgZ.  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 7gc?7TM  
: CDialog(CCaptureDlg::IDD, pParent) 5i@WBa  
{ 9,?7mgZ p  
 //{{AFX_DATA_INIT(CCaptureDlg) un F=";9H  
  m_bControl = FALSE; bu8AOtY9E-  
  m_bAlt = FALSE; Z35(f0b  
  m_bShift = FALSE; `nCVO;B  
  m_Path = _T("c:\\"); O#@G .~n?  
  m_Number = _T("0 picture captured."); :Ahw{z`H#  
  nCount=0; 9u;/l#?@T  
  bRegistered=FALSE; aizJ&7(>  
  bTray=FALSE; ,W|cyQ  
 //}}AFX_DATA_INIT $L4h'(s  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 rT|wZz9$@  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ?CD[jX}!  
} Pi hpo  
Fhrj$  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 0z$::p$%u  
{ i+Lqj  
 CDialog::DoDataExchange(pDX); `m`Y3I  
 //{{AFX_DATA_MAP(CCaptureDlg) %M*2j%6  
  DDX_Control(pDX, IDC_KEY, m_Key); G,}"}v:  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Y 8n*o3jM  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9i46u20  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Z8ds`KZM  
  DDX_Text(pDX, IDC_PATH, m_Path); x~JOg57up  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ~f:"Q(f+  
 //}}AFX_DATA_MAP +>ld  
} {%oxzdPc  
iv ~<me0F  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) - i#Kpf  
//{{AFX_MSG_MAP(CCaptureDlg) ny"z<N&}/  
 ON_WM_SYSCOMMAND()  MwC}  
 ON_WM_PAINT() [X 9zrGHt  
 ON_WM_QUERYDRAGICON() "s.hO0Z  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) [Y4Wm?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) J(:y-U  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 90 >V he  
//}}AFX_MSG_MAP 7NRm\%^q  
END_MESSAGE_MAP() kIR/.Ij}  
\beYb0(+  
BOOL CCaptureDlg::OnInitDialog() VfFbZds8f  
{ $H`{wJ?2(  
 CDialog::OnInitDialog(); v~A*?WU;n  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); sDB,+1"Y$  
 ASSERT(IDM_ABOUTBOX < 0xF000); UP7?9\  
 CMenu* pSysMenu = GetSystemMenu(FALSE); #}HdylI\}  
 if (pSysMenu != NULL) u}.mJDL  
 { '!F'B:  
  CString strAboutMenu; !;UoZ~  
  strAboutMenu.LoadString(IDS_ABOUTBOX); nT%ko7~-  
  if (!strAboutMenu.IsEmpty()) >qVSepK3  
  { (<}BlL   
   pSysMenu->AppendMenu(MF_SEPARATOR); L6"V=^Bq  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); kEp{L  
  } j[A:So  
 } [:zP]l.|  
 SetIcon(m_hIcon, TRUE); // Set big icon ^'n;W<\p)  
 SetIcon(m_hIcon, FALSE); // Set small icon c,:nWf  
 m_Key.SetCurSel(0); p^1~o/  
 RegisterHotkey(); ;Z9(ll:<$  
 CMenu* pMenu=GetSystemMenu(FALSE); H*P[tyz$  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); \YSprXe  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 1H?I?IT30  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); w*]FJ-b<.j  
 return TRUE; // return TRUE unless you set the focus to a control HQNpf1=D  
} [tRb{JsUd  
6 ZAZJn|  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) PQ{5*}$N  
{ Ciy%7_~\  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) q+} \ (|  
 { =!G{+&j  
  CAboutDlg dlgAbout; \mL]xE-  
  dlgAbout.DoModal(); ~e&O?X  
 } A&A{Thz  
 else ~9PZ/( '  
 { pekNBq Wm  
  CDialog::OnSysCommand(nID, lParam); ?AH B\S  
 } eM@xs<BR  
} 91-[[<  
tAPf#7{|   
void CCaptureDlg::OnPaint() !;4Hh)2  
{ fRT4>So   
 if (IsIconic()) mL-6+pJ@  
 { oQ A,57B  
  CPaintDC dc(this); // device context for painting Q/q>mN"#1  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); B}"V.Msv/  
  // Center icon in client rectangle <'QI_mP*  
  int cxIcon = GetSystemMetrics(SM_CXICON); >?#zPweA  
  int cyIcon = GetSystemMetrics(SM_CYICON); l&*= .Zc7!  
  CRect rect; ^]D+H9Tl  
  GetClientRect(&rect); Sx8C<S5r<  
  int x = (rect.Width() - cxIcon + 1) / 2; MxH |yo[  
  int y = (rect.Height() - cyIcon + 1) / 2; !b=W>5h  
  // Draw the icon *^w}SE(  
  dc.DrawIcon(x, y, m_hIcon); 7?D?s!%\  
 } >=:^N-a  
 else _Ie:!q  
 { sm;kg=  
  CDialog::OnPaint(); H@u5&  
 } NwxDxIIH/)  
} '\GU(j  
1:r#m- \  
HCURSOR CCaptureDlg::OnQueryDragIcon() #hP>IU  
{ &F:.OVzX  
 return (HCURSOR) m_hIcon; 2C1NDrS;}  
} %P{3c~?DH  
3 /PvH E{R  
void CCaptureDlg::OnCancel() ` Z/ MQ  
{ e0#t  
 if(bTray) 'tDUPm38  
  DeleteIcon(); _''un3eCY  
  CDialog::OnCancel(); `H 'wz7  
} ^KnK \  
BOh^oQh  
void CCaptureDlg::OnAbout() B[q"o I`  
{ @qYT/V*/  
 CAboutDlg dlg; a6Joa&`dv  
 dlg.DoModal(); [9B1%W  
} !Qf*d;wxn(  
Ndmw/ae  
void CCaptureDlg::OnBrowse() T"aE]4_  
{ w0+X;aId  
 CString str; a4gX@&it_k  
 BROWSEINFO bi; AW E ab  
 char name[MAX_PATH]; awI{%u_(nA  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Y%?*Lj|  
 bi.hwndOwner=GetSafeHwnd(); bdY:-8!3  
 bi.pszDisplayName=name; nt+OaXe5D  
 bi.lpszTitle="Select folder"; ~A1!!rJX  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; aj,o<J  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1;DRcVyS+  
 if(idl==NULL) >x3lA0m  
  return; B^]PKjLNZ  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ;TS%e[lFhQ  
 str.ReleaseBuffer(); #vhN$H:&q  
 m_Path=str; N|Ag8/2A  
 if(str.GetAt(str.GetLength()-1)!='\\') q3#+G:nh  
  m_Path+="\\"; 89;@#9  
 UpdateData(FALSE); 6Ol9P56j  
} H9PnJr8 \  
1q@R04i  
void CCaptureDlg::SaveBmp() 4P"bOt5izR  
{ kN78j  
 CDC dc; f0j]!g  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); "*.N'J\  
 CBitmap bm; }r!+wp   
 int Width=GetSystemMetrics(SM_CXSCREEN); t=xEUOQAn  
 int Height=GetSystemMetrics(SM_CYSCREEN); qTN%9!0@9  
 bm.CreateCompatibleBitmap(&dc,Width,Height); n>R(e>  
 CDC tdc; ,lStT+A  
 tdc.CreateCompatibleDC(&dc); ,i??}Wm5G  
 CBitmap*pOld=tdc.SelectObject(&bm); _ziSH 3(  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .c ~z^6x  
 tdc.SelectObject(pOld); D/~1?p  
 BITMAP btm; vy7/  
 bm.GetBitmap(&btm); P tLWFO  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; AFm9"mQrw  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Kvo&_:  
 BITMAPINFOHEADER bih; 1^2Q`~,g  
 bih.biBitCount=btm.bmBitsPixel; -*MY7t3  
 bih.biClrImportant=0; L<0_e^8  
 bih.biClrUsed=0; # =tw ,S  
 bih.biCompression=0; Z/:F)c,x  
 bih.biHeight=btm.bmHeight; O,|NOz  
 bih.biPlanes=1; > *VvV/UU  
 bih.biSize=sizeof(BITMAPINFOHEADER); ]wdE :k,D  
 bih.biSizeImage=size; y`j=(|DV  
 bih.biWidth=btm.bmWidth; vq^';<Wh.  
 bih.biXPelsPerMeter=0; *i^$xjOa  
 bih.biYPelsPerMeter=0; ]K*R[  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); gwQMy$  
 static int filecount=0; iB"ji4[z  
 CString name; abm 3q!a-  
 name.Format("pict%04d.bmp",filecount++); Um 6}h@>  
 name=m_Path+name; 9Dgs A`{$  
 BITMAPFILEHEADER bfh; *d;TpwUI  
 bfh.bfReserved1=bfh.bfReserved2=0; w5{l-Z  
 bfh.bfType=((WORD)('M'<< 8)|'B'); >e R^G5rn;  
 bfh.bfSize=54+size; Zfcf?&><  
 bfh.bfOffBits=54; N`,\1hHMT  
 CFile bf; t@9-LYbL  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ (lVMy\  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); $/D?Vw:]  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); )=d)j^ t9  
  bf.WriteHuge(lpData,size); jhQoBC>:  
  bf.Close(); k]5tU\;Yw  
  nCount++; SFd_k9  
 } Qd kus 214  
 GlobalFreePtr(lpData); (C#0 ML  
 if(nCount==1) *2->>"kh  
  m_Number.Format("%d picture captured.",nCount); T+&fUhSy  
 else 3PZ(Kn<  
  m_Number.Format("%d pictures captured.",nCount); 6>rz=yAM_  
  UpdateData(FALSE); | U"fhG=g  
} R$hIgw+p[  
a;Y:UwD9*  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 8]^|&"i.\d  
{ T?m@`"L,  
 if(pMsg -> message == WM_KEYDOWN) {qi #  
 { ].kj-,5>f  
  if(pMsg -> wParam == VK_ESCAPE) ' QG`^@Z  
   return TRUE; W j^@Zq#  
  if(pMsg -> wParam == VK_RETURN) BLt58LYGX  
   return TRUE; B os`+Y  
 } .Iqqjk  
 return CDialog::PreTranslateMessage(pMsg); xm1di@  
} pXO09L/nv  
/X.zt `  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Lk,q~  
{ I <D7 Jj  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ vLHn4>J,R  
  SaveBmp(); uK$ Xqo%L  
  return FALSE; ~S Bb2*ID  
} u1M8nb  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 9 ;p5z[jI  
 CMenu pop; mI,lW|/l,  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); e[u}Vf  
 CMenu*pMenu=pop.GetSubMenu(0); h>D;QY  
 pMenu->SetDefaultItem(ID_EXITICON); GkI'.  
 CPoint pt; 2K};-}eW  
 GetCursorPos(&pt); _MTZuhY  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); c.Hw K\IU  
 if(id==ID_EXITICON) |{kbc0*  
  DeleteIcon(); 1gkpK`u(B  
 else if(id==ID_EXIT) =bC'>qw}  
  OnCancel(); ik o>G  
 return FALSE; uc@4fn  
} z6@8IszU  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); PB$beQ  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) igA?E56?  
 AddIcon(); 8bdO-LJ9  
 return res; R&.&x'<  
} 4%~*}  
we`BqZV  
void CCaptureDlg::AddIcon() /}~=)QHH  
{ 4E5;wH  
 NOTIFYICONDATA data; M{G}-QK_.  
 data.cbSize=sizeof(NOTIFYICONDATA); ;X<Ez5v3  
 CString tip; JH]S'5X8K  
 tip.LoadString(IDS_ICONTIP); 07:V[@'  
 data.hIcon=GetIcon(0); Anyy  
 data.hWnd=GetSafeHwnd(); {guOAT- w  
 strcpy(data.szTip,tip); &mVClq  
 data.uCallbackMessage=IDM_SHELL; e`g+Jf`AT  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; y@~ VE5N  
 data.uID=98; }8tF.QjR|  
 Shell_NotifyIcon(NIM_ADD,&data); G7"(,L` 5  
 ShowWindow(SW_HIDE); stajTN*J  
 bTray=TRUE; N? Jy  
} v(yJGEf0  
!38KHq^|&  
void CCaptureDlg::DeleteIcon() P*iC#w]m  
{ G$TO'Ciu:  
 NOTIFYICONDATA data; p%mHxYP  
 data.cbSize=sizeof(NOTIFYICONDATA); #)~u YQ  
 data.hWnd=GetSafeHwnd(); VBi gUK4  
 data.uID=98; (+(@P*c1  
 Shell_NotifyIcon(NIM_DELETE,&data); QyVAs;  
 ShowWindow(SW_SHOW); q-;Y }q  
 SetForegroundWindow(); 1!.-/  
 ShowWindow(SW_SHOWNORMAL); 7BU7sQjs  
 bTray=FALSE; $?W2'Xm!V  
} !Ea >tQ|  
li3,6{S#  
void CCaptureDlg::OnChange() f}2}Ta  
{ ./XX  
 RegisterHotkey(); /J-'[Mc'D[  
} E} XmZxHV  
u@e.5_:S)  
BOOL CCaptureDlg::RegisterHotkey() \:{K",2  
{ KHZ[drb6$  
 UpdateData(); B@M9oNWHu  
 UCHAR mask=0; 9F[3B`w  
 UCHAR key=0; y*^UGJC:  
 if(m_bControl) e%)iDt\j  
  mask|=4; V4jMx[   
 if(m_bAlt) eg/itty  
  mask|=2; LXX('d  
 if(m_bShift) =>5Lp  
  mask|=1; *]U`]!Esp  
  key=Key_Table[m_Key.GetCurSel()]; FhY#3-jH  
 if(bRegistered){ ![K\)7iKo  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); )/ 'WboL  
  bRegistered=FALSE; td7(444]  
 } %z@ Z^Jv  
 cMask=mask; b3-j2`#  
 cKey=key; +7w5m  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); FtyT:=Kpc  
 return bRegistered; |#o' =whTl  
} VB*c1i  
}UsH#!9.  
  四、小结 %pq.fZ I   
G?$o+Y'F  
  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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