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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: sW[42A  
  vh T9#) HI  
  一、实现方法 4iDo.1B"  
!zD| @sX{  
  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: GlVq<RG*  
`,TPd ~#~  
#pragma data_seg("shareddata") #LF_*a0v  
HHOOK hHook =NULL; //钩子句柄 1`b?nX  
UINT nHookCount =0; //挂接的程序数目 IWTD>c).  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 DT_012 z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 x!S8'  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 10*U2FY)]  
static int KeyCount =0; Rnj2Q!C2  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 6Bs_" P[  
#pragma data_seg() GMksr%0Pj  
S# SA:>8s  
  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。 N+h|Ffnp  
x%LWcT/  
  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: .nT"f>S&'  
x}72jJe`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR t,+p!"MRY  
cKey,UCHAR cMask) NH4EsV]  
{ J\#6U|a""u  
 BOOL bAdded=FALSE; @@}A\wA-  
 for(int index=0;index<MAX_KEY;index++){ !SVW}Q=5#  
  if(hCallWnd[index]==0){ l~!#<=.  
   hCallWnd[index]=hWnd; ^fH]Rlx  
   HotKey[index]=cKey; ]kc]YO7i%R  
   HotKeyMask[index]=cMask; P%.9g  
   bAdded=TRUE; z.#gpTXD  
   KeyCount++; \\)3:1X  
   break; 6VRVk7"  
  } #uKHw2N  
 } 4ajBMgD]KG  
 return bAdded; (n#  
} eD G=-a4  
//删除热键 |)1"*`z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) y=-d*E  
{ ))u$j4 V  
 BOOL bRemoved=FALSE; julAN$2  
 for(int index=0;index<MAX_KEY;index++){ {_PV~8u  
  if(hCallWnd[index]==hWnd){ dDAdZxd  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ cND2(< jx:  
    hCallWnd[index]=NULL; +HUI1@ql  
    HotKey[index]=0; (,HA Os  
    HotKeyMask[index]=0; wMei`svY  
    bRemoved=TRUE; Dr<%Lr  
    KeyCount--; 90M:0SH  
    break; H~&9xtuHN  
   } h|_G2p^J+"  
  } !dGy"-i$h  
 } 1 BVivEG  
 return bRemoved; f H}`  
} m&b!\"0  
Q-Bci Bh$  
Ywlym\ [+  
  DLL中的钩子函数如下: s|YY i~  
-x5^>+Y4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) o"K{^ L~u  
{ +n1}({7m  
 BOOL bProcessed=FALSE; *COr^7Kf5  
 if(HC_ACTION==nCode) BwrMRMq"  
 { C'kd>LAGu  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 [JsQ/|=z  
   switch(wParam) lLo FM  
   {  uflp4_D   
    case VK_MENU: 2= u5N[*  
     MaskBits&=~ALTBIT; V<P@hAAr  
     break; KG)Y{-Ao  
    case VK_CONTROL: t~gnai  
     MaskBits&=~CTRLBIT; qky{]qNW  
     break; O3B\K <l  
    case VK_SHIFT: 4LKOBiEM  
     MaskBits&=~SHIFTBIT; 'N0d==aI  
     break; Ch^Al 2)=  
    default: //judge the key and send message G,$RsP  
     break; N!^U{;X7/  
   } Bglh}_X  
   for(int index=0;index<MAX_KEY;index++){ RwN*/Li  
    if(hCallWnd[index]==NULL) <dh7*M  
     continue; !)KX?i[Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dorZ O2Uc  
    { Z6 (;~"Em  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (T!Q  
     bProcessed=TRUE; L@9"6&  
    } bZ:w_z[3=  
   } hZ5h(CQ?"#  
  } Bu*ge~  
  else if((lParam&0xc000ffff)==1){ //有键按下 +*~?JT  
   switch(wParam) i$"B  
   { 3x.|g   
    case VK_MENU: V1;n5YL  
     MaskBits|=ALTBIT; \*1pFX#  
     break; EivZI<<a  
    case VK_CONTROL: .Mdxbs6.C  
     MaskBits|=CTRLBIT; D@FJVF7c  
     break; -i7W|X"  
    case VK_SHIFT: 9kQ~)4#  
     MaskBits|=SHIFTBIT; OV Iu&6#  
     break; eB^:+h#A_  
    default: //judge the key and send message IgQW 5E#  
     break; Z_cTuu0'  
   } m?>$!B4jFB  
   for(int index=0;index<MAX_KEY;index++){ ES<"YF  
    if(hCallWnd[index]==NULL) bY&s $Ry3"  
     continue; jo0p/5;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "PLZZL$+  
    { /|P&{!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -@<k)hWr  
     bProcessed=TRUE; >Ix)jSNLgo  
    } E;9SsA  
   } 7YkxIzE  
  } {pm>F}Cwy  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ]7fqVOiOu  
   for(int index=0;index<MAX_KEY;index++){ J'.U+XU  
    if(hCallWnd[index]==NULL) >& \QLo[5  
     continue; G}AfCd4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^+Ec}+ Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); e(,sFhR  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 r8}GiP0|  
   } RWz^ MV5K  
  } [#$z.BoEo  
 } y!)Z ^u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); CXb)k.L   
} lpj$\WI=  
>jq~5HN  
  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: "#qyX[\  
Ks{^R`O au  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QY/36gK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4JT9EKo  
w-"o?;)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: %, XyhS5[o  
[x'xbQLGd  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) vB#&XK.aW  
{ 3QL'uk  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) PGOi#x  
 { )CSb\  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 AFF7fK  
  SaveBmp(); /t01z~_  
  return FALSE; e{>X2UNW  
 } Tmg~ZI:MW  
 …… //其它处理及默认处理 .3t[M0sd  
} RL[?&L$7^%  
?s dVd  
0' @^PzX  
  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。 ~ubGx  
)R<hYd  
  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。 @c9VCG D  
>s1'I:8  
  二、编程步骤 bN8GRK )  
JD^(L~n]  
  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"; '@3hU|jO!  
wh<+.Zp  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; R]0awV1b  
e3yBB*@  
  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; "nf.kj:>  
k z@@/DD/9  
  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; +>@<'YI<  
EX~ U(JB6  
  5、 添加代码,编译运行程序。 +3(1QgYM%  
KE]!7+8-  
三、程序代码 {*r*+}@  
`Jq ?+W  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ^^qB=N[';  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) H$9--p  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ NU-({dGK}  
#if _MSC_VER > 1000 9_n!.zA<  
#pragma once i<YatW~Pu  
#endif // _MSC_VER > 1000 s"*zyLUUo  
#ifndef __AFXWIN_H__ 1NtN-o)N?  
#error include 'stdafx.h' before including this file for PCH >t<FG2  
#endif S>Z V8  
#include "resource.h" // main symbols Ysz{~E'  
class CHookApp : public CWinApp )3V5P%Q  
{ *Sm$FMWQ  
 public: FYFP 6ti  
  CHookApp(); Em N0K'x  
  // Overrides Bmm#5X@*  
  // ClassWizard generated virtual function overrides K{%}kUj>  
  //{{AFX_VIRTUAL(CHookApp) ]s ?BwLU6  
 public: H-K,Q%;C@  
  virtual BOOL InitInstance(); )c b e 4  
  virtual int ExitInstance(); ]j(2FM)#  
  //}}AFX_VIRTUAL cor?#  
  //{{AFX_MSG(CHookApp) > nDx)!I  
  // NOTE - the ClassWizard will add and remove member functions here. }eXzs_  
  // DO NOT EDIT what you see in these blocks of generated code ! =toqEm~  
  //}}AFX_MSG iov55jT~l@  
  DECLARE_MESSAGE_MAP() 6kK\nZ$o$  
}; E5w. wx  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); (%ra~s?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %3M(!X:[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); t,4q]Jt  
BOOL InitHotkey(); \Lv eZ_h5  
BOOL UnInit(); lpQsmd#  
#endif ~+d?d6*c  
( {ads_l  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. XO~xbG7>gZ  
#include "stdafx.h" gQ %'2m+  
#include "hook.h" yd2v_  
#include <windowsx.h> 3/RmJ `c{  
#ifdef _DEBUG ;aExEgTq  
#define new DEBUG_NEW lJP6s k  
#undef THIS_FILE aL$m  
static char THIS_FILE[] = __FILE__; h?jy'>T?b2  
#endif `VCU`Y  
#define MAX_KEY 100 DBYD>UA  
#define CTRLBIT 0x04 @C{IgV  
#define ALTBIT 0x02 !2s< v  
#define SHIFTBIT 0x01 Nc:, [8{l  
#pragma data_seg("shareddata") /-Y*V*E  
HHOOK hHook =NULL; W2G`K+p  
UINT nHookCount =0; al$G OMi  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey -h%;L5oJ2,  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT *|h-iA+9  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey zA=gDuy3@  
static int KeyCount =0; .|}ogTEf  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift PdcF  
#pragma data_seg() p&ytUT na  
HINSTANCE hins; 8'Sw?FbVA/  
void VerifyWindow(); W|_ @ju  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) H)(@A W+-  
//{{AFX_MSG_MAP(CHookApp) P/5bNK!  
// NOTE - the ClassWizard will add and remove mapping macros here. Xm`jD'G  
// DO NOT EDIT what you see in these blocks of generated code! -K hXb  
//}}AFX_MSG_MAP h~)oiT2v  
END_MESSAGE_MAP() 4vq,W_n.hQ  
xwhH_[  
CHookApp::CHookApp() 1H`T=:P?  
{ 6*u#^">,<  
 // TODO: add construction code here, ^UHt1[  
 // Place all significant initialization in InitInstance *9 M 5'  
} Wly-z$\  
mO;X>~K  
CHookApp theApp; %wn|H>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) v _?0|Ei[  
{ TkXD#%nFY  
 BOOL bProcessed=FALSE; M/C7<?&  
 if(HC_ACTION==nCode) Aq@_^mq1A  
 { 0 {#c  
  if((lParam&0xc0000000)==0xc0000000){// Key up "vQ$RW -  
   switch(wParam) OQ;'Xo  
   { Oaf!\ z}  
    case VK_MENU: ]S4TX  
     MaskBits&=~ALTBIT; ~n9BN'@x  
     break; L!s/0kBg  
    case VK_CONTROL: [ R1S+i  
     MaskBits&=~CTRLBIT; -f IX6  
     break; *jM~VTXwt  
    case VK_SHIFT: z6 2gF|Uj  
     MaskBits&=~SHIFTBIT; yb*P&si5bY  
     break; ?3~]H   
    default: //judge the key and send message Mk9'  
     break; pt.0%3  
   } 8gwJ%"-K  
   for(int index=0;index<MAX_KEY;index++){  5 fY\0  
    if(hCallWnd[index]==NULL) JYB"\VV  
     continue; n=!]!'h\:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) flDe*F^  
    { V1 T?T9m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (1p[K-J)r  
     bProcessed=TRUE; (oO*|\9u  
    } :c3}J<Z  
   } 3on]#/"1b  
  } 58)`1p\c'  
  else if((lParam&0xc000ffff)==1){ //Key down u~FXO[b  
   switch(wParam) j H#Tt;  
   { &^$dHr6v  
    case VK_MENU: fr kDf-P  
     MaskBits|=ALTBIT; t<s:ut)Q!  
     break; zBD ?O!  
    case VK_CONTROL: N)|mA)S)  
     MaskBits|=CTRLBIT; L1ZhH3}X  
     break; n*~=O'  
    case VK_SHIFT: W<C \g~\  
     MaskBits|=SHIFTBIT; ,DsqKXSU  
     break; rKEi1b  
    default: //judge the key and send message Lsa&A+fru  
     break; +InAK>NZ'  
   } x LR 2H>B}  
   for(int index=0;index<MAX_KEY;index++) Ex2TV7I  
   { <+@?V$&  
    if(hCallWnd[index]==NULL) Qz/o-W;  
     continue; yx?Z&9z <  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "\M16N  
    { b@j**O>[q)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 5>+>=)*  
     bProcessed=TRUE; ZD\`~I|gp  
    } COPH)Bdq.  
   } Y-\/Y*;cd  
  } &TYTeJ]  
  if(!bProcessed){ q8%T)$!  
   for(int index=0;index<MAX_KEY;index++){ )HbsUm#  
    if(hCallWnd[index]==NULL) $/^DY&  
     continue; ~?i;~S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7pH`"$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (8DJf"}  
   } FG]xn(E  
  } `t_S uZ`V  
 } zvv<w@rX  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); j f25Ky~  
} ]G.ttfC  
SXkUtY$  
BOOL InitHotkey() 1vKc>+9  
{ (n:d {bKV  
 if(hHook!=NULL){ _Kdqa%L !  
  nHookCount++; :L gFd  
  return TRUE; 1xN6V-qk  
 } z%-Yz- G9  
 else iIWz\FM  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 5|S|S))_Q  
  if(hHook!=NULL) Pqiw[+a$  
   nHookCount++; &|>CW:)&1"  
  return (hHook!=NULL); .%)FK#s-  
} ;Q"xXT`;:  
BOOL UnInit() Ay\=&4dv  
{  eX7dyM  
 if(nHookCount>1){ ~/Gx~P]  
  nHookCount--; =kvfe" N0e  
  return TRUE; eF+:w:\h  
 } g-`HKoKe  
 BOOL unhooked = UnhookWindowsHookEx(hHook); C "XvspJ  
 if(unhooked==TRUE){ G|eY$5!i  
  nHookCount=0; rMRM*`Q2  
  hHook=NULL; ^<X+t&!z  
 } N~7xj?  
 return unhooked; !$&k@#v:  
} K=,nX7Z5  
'z$BgXh\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u[nx?!  
{ xCU^4DO3p  
 BOOL bAdded=FALSE; q =sEtH=  
 for(int index=0;index<MAX_KEY;index++){ ):"Z7~j=  
  if(hCallWnd[index]==0){ umPd+5i  
   hCallWnd[index]=hWnd; Q;r9>E!  
   HotKey[index]=cKey; 48;6C g  
   HotKeyMask[index]=cMask; ct,B0(]  
   bAdded=TRUE; X"_,#3Ko!  
   KeyCount++; gc``z9@Xg  
   break; }uWIF|h~  
  } 2ghTAsUx9  
 } (gN[<QL  
 return bAdded; *J^l r"%c  
} o5=1  
Q9,H 0r-%  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lS"g[O+  
{ 69#mj*p@+  
 BOOL bRemoved=FALSE; mS?.xu  
 for(int index=0;index<MAX_KEY;index++){ K@av32{  
  if(hCallWnd[index]==hWnd){ g/Q"%GN,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 5(BB`)  
    hCallWnd[index]=NULL; q@K8,=/.#  
    HotKey[index]=0; !RX\">z  
    HotKeyMask[index]=0; 05= $Dnv  
    bRemoved=TRUE; /{Ff)<Q.Z  
    KeyCount--; I5EKS0MQ!  
    break; j{k]8sI,H]  
   } ( R2432R}J  
  } UjCQ W:[  
 } Ky"]L~8$  
 return bRemoved; * V;L|c  
} oU/CXz?H  
tQ!p<Q= $)  
void VerifyWindow() ee7#PE]}  
{ |'@c ~yc  
 for(int i=0;i<MAX_KEY;i++){ #rZF4>c  
  if(hCallWnd!=NULL){ -+vA9,pI  
   if(!IsWindow(hCallWnd)){ W(jXOgs+_  
    hCallWnd=NULL; bbGSh|u+P  
    HotKey=0; "9mVBa|Q  
    HotKeyMask=0; DeqTr:  
    KeyCount--; kR+xInDM*  
   } CKC%|xke  
  } ii0{$}eoh  
 } cJb.@8^J  
} 8:W," "  
;ZnSWIF2  
BOOL CHookApp::InitInstance() ;Y/{q B!  
{ um/2.Sn>  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); $U3|.4  
 hins=AfxGetInstanceHandle(); E0F8FR'  
 InitHotkey(); P''5A6#5  
 return CWinApp::InitInstance(); :.;p Rz  
} 4<`Qyul-  
t(<^of:  
int CHookApp::ExitInstance() ~3]ZN'b\  
{ 93Z/|7  
 VerifyWindow(); f?KHp|  
 UnInit(); p]/qf \E  
 return CWinApp::ExitInstance(); Eqx2.S  
} jZRf{  
FG-v71!h#  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file fY)Dx c&ue  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) <n8K"(sy}  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ w$ zX.;s  
#if _MSC_VER > 1000 \0}!qG![AA  
#pragma once kNC.^8ryz[  
#endif // _MSC_VER > 1000 {VB n@^'s  
, `4chD  
class CCaptureDlg : public CDialog F0 yvV6;  
{ g43j-[j)  
 // Construction ,tt .oF|  
 public: 5m.{ayE  
  BOOL bTray; N^G $:GC  
  BOOL bRegistered; _(#HQd,i  
  BOOL RegisterHotkey(); hLs<g!*O  
  UCHAR cKey; x2q6y  
  UCHAR cMask; $0uh8RB  
  void DeleteIcon(); RK7vR~kf<  
  void AddIcon(); wjJM\BKr`  
  UINT nCount; Z*AT &7  
  void SaveBmp(); GM1z@i\5  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor }}R?pU_  
  // Dialog Data )@vhqVv?  
  //{{AFX_DATA(CCaptureDlg) H2f!c{t$p  
  enum { IDD = IDD_CAPTURE_DIALOG }; = [N= mC  
  CComboBox m_Key; x,CTB  
  BOOL m_bControl; 79DzrLu  
  BOOL m_bAlt; 2#<)-Cak  
  BOOL m_bShift; kTC'`xv  
  CString m_Path; :K:oH}4oh  
  CString m_Number; :htz]  
  //}}AFX_DATA bc+~g>o  
  // ClassWizard generated virtual function overrides +"sjkdum1  
  //{{AFX_VIRTUAL(CCaptureDlg) &U_YDUQ'L  
 public: ]lT8Z-h@  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ^Y;}GeA,  
 protected: $)HD`E  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %l4;-x<e  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ^M:Y$9r_s  
  //}}AFX_VIRTUAL zmA]@'j  
  // Implementation ~}lYp^~:J  
 protected: {;z{U;j  
  HICON m_hIcon; JJIlR{WY_  
  // Generated message map functions -<g&U*/E  
  //{{AFX_MSG(CCaptureDlg) i6S5 4&^!  
  virtual BOOL OnInitDialog(); n! Dr:$  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 9.:]eL  
  afx_msg void OnPaint(); cO8':P5Q  
  afx_msg HCURSOR OnQueryDragIcon(); :.k1="H~@  
  virtual void OnCancel(); R6(sWN-  
  afx_msg void OnAbout(); 9<e%('@[  
  afx_msg void OnBrowse(); &:>3tFQSH  
  afx_msg void OnChange(); W2$MH: j  
 //}}AFX_MSG O c[F  
 DECLARE_MESSAGE_MAP() (6y[,lYH  
}; j_(DH2D  
#endif &["s/!O1R  
}?\8%hK"a7  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Ipp#{'Do  
#include "stdafx.h" P{bRRn4Z  
#include "Capture.h" GiZv0>*x  
#include "CaptureDlg.h" $wr B5m?  
#include <windowsx.h> KQf=t0Z=Ce  
#pragma comment(lib,"hook.lib") m{ wk0  
#ifdef _DEBUG 6-fdfU  
#define new DEBUG_NEW f3>L/9[[<P  
#undef THIS_FILE y ;\m1o2  
static char THIS_FILE[] = __FILE__; 1BjMVMH  
#endif Z! /!4(Fh  
#define IDM_SHELL WM_USER+1 Q!91uNL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v)f;dq^z-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Jbv[Ql#  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; R&-Vm3mc3  
class CAboutDlg : public CDialog 3} 7`?$ 5  
{ 2l4*6rYa(  
 public: (&B`vgmb  
  CAboutDlg(); zu,F 0;De  
  // Dialog Data <M y+!3\A  
  //{{AFX_DATA(CAboutDlg) 3)6TnY/u6{  
  enum { IDD = IDD_ABOUTBOX }; H|.cD)&eYy  
  //}}AFX_DATA &'V1p4'  
  // ClassWizard generated virtual function overrides j`D%Wx_  
  //{{AFX_VIRTUAL(CAboutDlg) F3?PlH:Y  
 protected:  kS7`g A  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support QX`T-)T e  
  //}}AFX_VIRTUAL nxjP4d>  
  // Implementation hZ[(Ik]*Zd  
 protected: Ah?,9r=U  
  //{{AFX_MSG(CAboutDlg) ^t$xR_  
  //}}AFX_MSG )bgaqca_{  
  DECLARE_MESSAGE_MAP() .c5)`  
}; u_Wftb?9  
sTS Nu+  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) > u!# 4  
{ U.GRN)fL4  
 //{{AFX_DATA_INIT(CAboutDlg) yrF"`/zv6|  
 //}}AFX_DATA_INIT SSAf<44e  
} hr/H vB  
0| }]=XN^  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) W"v"mjYud  
{  z@8W  
 CDialog::DoDataExchange(pDX); /$U< S"  
 //{{AFX_DATA_MAP(CAboutDlg) W=S<DtG2  
 //}}AFX_DATA_MAP @2`$ XWD  
} !U "?vSl  
<k'%rz  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) uxOeD%Z>  
 //{{AFX_MSG_MAP(CAboutDlg) [0?W>A*h  
 // No message handlers ?;YymD_  
 //}}AFX_MSG_MAP tRCz[M&  
END_MESSAGE_MAP() TPF5?  
+V` *  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) l+UUv]:1  
: CDialog(CCaptureDlg::IDD, pParent) T&q0TBT  
{ ,\RZ+kC>~  
 //{{AFX_DATA_INIT(CCaptureDlg) s# 9*`K  
  m_bControl = FALSE; aGml!N5'  
  m_bAlt = FALSE; -<{;.~nI.  
  m_bShift = FALSE; u85  dG7  
  m_Path = _T("c:\\"); cuoZ:Wh  
  m_Number = _T("0 picture captured."); '* eeup  
  nCount=0; b6?&h:{k  
  bRegistered=FALSE; (MGYX_rD  
  bTray=FALSE; EY^+ N>  
 //}}AFX_DATA_INIT X-<l+WP  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 JC.nfxG@:  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); .Cz9?]jyI  
} _+6aD|7x  
J3z:U&%=  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Fl}{"eCF8  
{ <}Hs@`jS  
 CDialog::DoDataExchange(pDX); n)uck5  
 //{{AFX_DATA_MAP(CCaptureDlg) M-V{(  
  DDX_Control(pDX, IDC_KEY, m_Key); KK';ho,W  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); O63:t$Yx#  
  DDX_Check(pDX, IDC_ALT, m_bAlt); }pJLK\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); _]t^F9l  
  DDX_Text(pDX, IDC_PATH, m_Path); wZ%a:Z4TcM  
  DDX_Text(pDX, IDC_NUMBER, m_Number); b[rVr J  
 //}}AFX_DATA_MAP a{@gzB  
} Db K(Rh_ K  
G@+R!IG  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ZZ324UuATX  
//{{AFX_MSG_MAP(CCaptureDlg) gZ>) S@  
 ON_WM_SYSCOMMAND() [J8;V|v  
 ON_WM_PAINT() P[%nD cB  
 ON_WM_QUERYDRAGICON() REGk2t.L  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) LEC=@) B  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) I&9Itn p$  
 ON_BN_CLICKED(ID_CHANGE, OnChange) _J X>#h  
//}}AFX_MSG_MAP `{1~]?-&  
END_MESSAGE_MAP() @q"HZO[  
y#{v\h Cz  
BOOL CCaptureDlg::OnInitDialog() 8P* d  
{ `kYcTFk  
 CDialog::OnInitDialog(); s3[\&zt  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); se@ ?:n1)  
 ASSERT(IDM_ABOUTBOX < 0xF000); &7r73~TXm  
 CMenu* pSysMenu = GetSystemMenu(FALSE); U[{vA6  
 if (pSysMenu != NULL) aP[oLk$'Z  
 { hEq-)-^G  
  CString strAboutMenu; -oT3`d3  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ~0Z.,p_  
  if (!strAboutMenu.IsEmpty()) KA? J:  
  { F EA t6  
   pSysMenu->AppendMenu(MF_SEPARATOR); %j/}e>$"Nk  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); lSG]{  
  } a];1)zVA6  
 } PY MofQaZ  
 SetIcon(m_hIcon, TRUE); // Set big icon ;~GBD]  
 SetIcon(m_hIcon, FALSE); // Set small icon 1<;VD0XX  
 m_Key.SetCurSel(0); slQEAqG)B  
 RegisterHotkey(); !LJ4 S  
 CMenu* pMenu=GetSystemMenu(FALSE); -sxu7I  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ^Rb*mI  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); >0JC u^9  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); /RI"a^&9A  
 return TRUE; // return TRUE unless you set the focus to a control Al+}4{Q+?  
} z#B(1uI  
d*_rJE}B  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^#!\VGnL  
{ y& (pt!I  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) E1s~ +  
 { vP%}XEF  
  CAboutDlg dlgAbout; <-DQ(0xg  
  dlgAbout.DoModal(); 9p,PWA  
 } C@WdPjxj  
 else LT#EYnG  
 { 3<>DDY2bl  
  CDialog::OnSysCommand(nID, lParam); "j8`)XXa(  
 } 0"{-<Wot}  
} \U>|^$4 #5  
bT^(D^  
void CCaptureDlg::OnPaint() ^B!()39R?  
{ _+OCI%=:  
 if (IsIconic()) jJD*s/o  
 { iu.Jp92  
  CPaintDC dc(this); // device context for painting !j/54,  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); -TS5g1  
  // Center icon in client rectangle LKBh{X0%(  
  int cxIcon = GetSystemMetrics(SM_CXICON); mNOx e  
  int cyIcon = GetSystemMetrics(SM_CYICON); XXA.wPD-  
  CRect rect; |W*5<2Q9  
  GetClientRect(&rect);  I)MRAo  
  int x = (rect.Width() - cxIcon + 1) / 2; j&[u$P*K  
  int y = (rect.Height() - cyIcon + 1) / 2; ~KczP1p  
  // Draw the icon 3e9UDN2  
  dc.DrawIcon(x, y, m_hIcon); m=25HH7enb  
 } #nq_R  
 else %-[*G;c'w  
 { Z^Yy sf  
  CDialog::OnPaint(); Xp9] 9H.  
 } tgj 5l#P  
} LkWY6 ?$U  
@0V4$OoFl  
HCURSOR CCaptureDlg::OnQueryDragIcon() &g~NkJc0c  
{ Q <ulh s  
 return (HCURSOR) m_hIcon; ZK h4:D  
} .,f]'!5  
Z7I\\M  
void CCaptureDlg::OnCancel() yL %88,/  
{ VRTJKi  
 if(bTray) Z23T 2  
  DeleteIcon(); [6Q1yNE  
  CDialog::OnCancel(); )J?8"+_Y  
} ]X> I(p@  
BO2s(8  
void CCaptureDlg::OnAbout() R$`%<Y3)  
{ v'm-A d+4t  
 CAboutDlg dlg; 5,+fM6^V  
 dlg.DoModal(); DOOF--ua  
} tRo` @eEX  
{Ve3EYYm  
void CCaptureDlg::OnBrowse() qP-_xpu]R  
{ sL,|+>7T^M  
 CString str; -EP(/CS!  
 BROWSEINFO bi; jOd+LXPJ  
 char name[MAX_PATH]; u$FL(m4  
 ZeroMemory(&bi,sizeof(BROWSEINFO));  % s@  
 bi.hwndOwner=GetSafeHwnd(); B|.A6:1g+  
 bi.pszDisplayName=name; 1je/l9L  
 bi.lpszTitle="Select folder"; r4d#;S9{o  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; {|'NpV  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ;ik,6_/Y  
 if(idl==NULL) 2B^WZlx  
  return; kgI8PybY  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); z4(`>z2a  
 str.ReleaseBuffer(); 2O- 4x  
 m_Path=str; 9I*2xy|I  
 if(str.GetAt(str.GetLength()-1)!='\\') Ta$55K0  
  m_Path+="\\"; uw/N`u  
 UpdateData(FALSE); 4C )sjk?m  
} 3Kc9*]D  
y\,,hs  
void CCaptureDlg::SaveBmp() zK>m4+)~  
{ < {h \Msx%  
 CDC dc; eJ6 #x$I,  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); >f4[OBc  
 CBitmap bm; i(;.Y  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6uTC2ka[&R  
 int Height=GetSystemMetrics(SM_CYSCREEN); %`~+^{Wp  
 bm.CreateCompatibleBitmap(&dc,Width,Height); x4h.WDT$  
 CDC tdc; Gqj(2.AY  
 tdc.CreateCompatibleDC(&dc); ^j@+!A_.Q  
 CBitmap*pOld=tdc.SelectObject(&bm); i'.D=o  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); XMz*}B6GQ  
 tdc.SelectObject(pOld); ?XeaoD/  
 BITMAP btm; !pC`vZG"  
 bm.GetBitmap(&btm); j#u{(W'r  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; YkE_7r(1  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); #^yOW^  
 BITMAPINFOHEADER bih; 5V~vND* s  
 bih.biBitCount=btm.bmBitsPixel; 'h^Ya?g  
 bih.biClrImportant=0; L)4~:f)B  
 bih.biClrUsed=0; @t0T+T3  
 bih.biCompression=0; |Qcj +HH.  
 bih.biHeight=btm.bmHeight; &8yGV i  
 bih.biPlanes=1; =k,?+h~  
 bih.biSize=sizeof(BITMAPINFOHEADER); X,Rl&K\b"  
 bih.biSizeImage=size; #;5Q d'  
 bih.biWidth=btm.bmWidth; hk$I-  
 bih.biXPelsPerMeter=0; O hRf&5u$  
 bih.biYPelsPerMeter=0; g7^|(!Y%  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); !D?(}nag  
 static int filecount=0; YQtq?&0Ct  
 CString name; ]')y(_{  
 name.Format("pict%04d.bmp",filecount++); %YbL%i|U  
 name=m_Path+name; a5aHv/W#P  
 BITMAPFILEHEADER bfh; 3t9CN )*  
 bfh.bfReserved1=bfh.bfReserved2=0; cucmn*o?  
 bfh.bfType=((WORD)('M'<< 8)|'B'); V7`vLs-  
 bfh.bfSize=54+size; sAPQbTSM  
 bfh.bfOffBits=54; R NQq"c\  
 CFile bf; :I2,  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){  F=a  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); OjNOvh&N  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ~d3@x\I?  
  bf.WriteHuge(lpData,size); eo@8?>}{X  
  bf.Close(); >ts}\.(]  
  nCount++; R]o0V*n  
 } Z9MR"!0  
 GlobalFreePtr(lpData); O}(sn  
 if(nCount==1) {p$@)b  
  m_Number.Format("%d picture captured.",nCount); 2(x| %  
 else X @pm!c#  
  m_Number.Format("%d pictures captured.",nCount); ExN $J  
  UpdateData(FALSE); t: oQHhO?  
} gz~ug35  
Jt #HbAY  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) +0j{$MPZ  
{ Zy.A9 Bh~  
 if(pMsg -> message == WM_KEYDOWN) h_\( $"  
 { CBNt _y  
  if(pMsg -> wParam == VK_ESCAPE) mIp> ~  
   return TRUE; ~:PM_o*6  
  if(pMsg -> wParam == VK_RETURN) oO`a{n-  
   return TRUE; dh.{lvlX|  
 } j l]3B  
 return CDialog::PreTranslateMessage(pMsg); q@~{ g[   
} ^Sj;~  
4P=1)t?tX  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,G-  
{ Qa\,)<'D:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ )_n(u3'  
  SaveBmp(); wnK6jMjkSf  
  return FALSE; 9+$IulOvk  
} 2+?W{yAEi  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ H+-x.l`  
 CMenu pop; GN Ewq$  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ~7PiIky.  
 CMenu*pMenu=pop.GetSubMenu(0); }Y|M+0   
 pMenu->SetDefaultItem(ID_EXITICON); sa _J6~  
 CPoint pt; PkZ1Db  
 GetCursorPos(&pt); U$y wO4.  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); T8)X?>CIW  
 if(id==ID_EXITICON) 3$Vx8:Rhdn  
  DeleteIcon(); -ah)/5j  
 else if(id==ID_EXIT) S:Jg#1rww-  
  OnCancel(); ]=ZPSLuEm%  
 return FALSE; 'h 7x@[|  
} Iz83T9I&  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Q`6hJgyL  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) $tXW/  
 AddIcon(); l_$>$d  
 return res; 0I:5}$+J?  
} zUDXkG*Lv  
Qds:*]vGS  
void CCaptureDlg::AddIcon() UZmUYSu;  
{ ->o[ S0  
 NOTIFYICONDATA data; r$-P  
 data.cbSize=sizeof(NOTIFYICONDATA); E2t& @t%W  
 CString tip; avM8-&h  
 tip.LoadString(IDS_ICONTIP); `HnZ{PKf  
 data.hIcon=GetIcon(0); 6uKth mr  
 data.hWnd=GetSafeHwnd(); (d@(QJ  
 strcpy(data.szTip,tip); !Q<3TfC  
 data.uCallbackMessage=IDM_SHELL; Wd+G)Mu_=  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; t#8QyN  
 data.uID=98; ZMr[:,Jp  
 Shell_NotifyIcon(NIM_ADD,&data); EkRx/  
 ShowWindow(SW_HIDE); LR!%iP  
 bTray=TRUE; isy[RAP<  
} =R 4]Kf  
Y:#B0FD,gC  
void CCaptureDlg::DeleteIcon() hO{&bY0  
{ I$x<B7U  
 NOTIFYICONDATA data; GVu[X?q@|  
 data.cbSize=sizeof(NOTIFYICONDATA); p:$kX9mT&  
 data.hWnd=GetSafeHwnd(); 9o6[4Q}  
 data.uID=98; GUD]sXSj  
 Shell_NotifyIcon(NIM_DELETE,&data); W8u&5#$I  
 ShowWindow(SW_SHOW); ?b'(39fj  
 SetForegroundWindow(); `8#xO{B1  
 ShowWindow(SW_SHOWNORMAL); S 1^t;{"  
 bTray=FALSE; g.blDOmlc  
} [`s.fkb8  
1*$6u5.=F  
void CCaptureDlg::OnChange() :is2 &-|x  
{ |uz\XK  
 RegisterHotkey(); nUVk;0at  
} w-$iKtb.  
(x@J@ GP*  
BOOL CCaptureDlg::RegisterHotkey() TuPD5-wB&  
{ _ G t;=  
 UpdateData(); i `p1e5$  
 UCHAR mask=0; 7lAJ 0  
 UCHAR key=0; W"pHR sf  
 if(m_bControl) =sv?))b`  
  mask|=4; Nu3IYS5&  
 if(m_bAlt) T-GvPl9ZJw  
  mask|=2; <n2'm  
 if(m_bShift)  b{)kup  
  mask|=1; qmGHuQVe  
  key=Key_Table[m_Key.GetCurSel()]; AS:k&t  
 if(bRegistered){ . XbDb  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8.^`~ta  
  bRegistered=FALSE; N?#L{Yt  
 } Zn40NKYc  
 cMask=mask; 8''1H<f  
 cKey=key; E BoC,{R#  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); mA%}ijR6y  
 return bRegistered; ,' t&L]  
} d8R|0RZ  
(fr=[m$`  
  四、小结 GUM-|[~  
$FIJI^Kd7  
  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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