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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: 9~Y)wz  
  Q KDb  
  一、实现方法 LRqw\fKk[  
-=v/p*v0o  
  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: g9 grfN  
"'&>g4F`o  
#pragma data_seg("shareddata") d=c1WK  
HHOOK hHook =NULL; //钩子句柄 *cI6 &;y  
UINT nHookCount =0; //挂接的程序数目  !z "a_  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 m;$F@JJ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 k=d%.kg  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 6@ (k8<3  
static int KeyCount =0; nEZ-h7lzl(  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 q:D0$YY0  
#pragma data_seg() o q'J*6r  
5Qm.ECXV  
  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。 y:^>(l#;  
w;h\Y+Myyk  
  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: p8}5x 2F  
f;_K}23  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR H*:r>Lm=  
cKey,UCHAR cMask) I1}{~@  
{ EFT02#F_f  
 BOOL bAdded=FALSE; ,*O{jc`(  
 for(int index=0;index<MAX_KEY;index++){ WMdz+^\(  
  if(hCallWnd[index]==0){ ? A^3.`  
   hCallWnd[index]=hWnd; :g]HB ,78  
   HotKey[index]=cKey; }fa%JN %E  
   HotKeyMask[index]=cMask; n79DS(t  
   bAdded=TRUE; g)zn.]  
   KeyCount++; C6;](rN)N  
   break; LYxlo<f  
  } $'I$n  
 } 41f m}  
 return bAdded; (VF4FC  
} V+"*A  
//删除热键 GQ8D j!8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H(*=9  
{ Pc\4 QvQ8  
 BOOL bRemoved=FALSE; _ UVX  
 for(int index=0;index<MAX_KEY;index++){ sLpCWIy  
  if(hCallWnd[index]==hWnd){ U K]{]-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ v#YS`];B  
    hCallWnd[index]=NULL; vSHIl"h  
    HotKey[index]=0; "n2xn%t{  
    HotKeyMask[index]=0; ?#{2?%_  
    bRemoved=TRUE; T\$^>@  
    KeyCount--; LF3GVu,  
    break; N6m*xxI{  
   } ( _F  
  } lDX&v$  
 } %q\P'cK  
 return bRemoved; $/U^/2)  
} GXv o't@N  
f'?6D+Yw~  
9 %.<V_$  
  DLL中的钩子函数如下: yZPFo  
K:mL%o2J  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) : QhEu%e  
{ 0g*r!aa  
 BOOL bProcessed=FALSE; ;?L[]Ezzt  
 if(HC_ACTION==nCode) aK=3`q  
 { 4`'BaUU(  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 %`uRUex  
   switch(wParam) /IQ-|Qkg  
   {  `b'|FKc]  
    case VK_MENU: \kJt@ [w%  
     MaskBits&=~ALTBIT; i!+3uHWu`)  
     break; (A<sFw?  
    case VK_CONTROL: _F$t#.o  
     MaskBits&=~CTRLBIT; r :MaAT<  
     break; `] dx%  
    case VK_SHIFT: :$Di.|l@7  
     MaskBits&=~SHIFTBIT; r(xlokpnb6  
     break; OD!CnK  
    default: //judge the key and send message 5]n<%bP\  
     break; @ke})0 `5  
   } kG7,1teMk  
   for(int index=0;index<MAX_KEY;index++){ ]TZWFL-  
    if(hCallWnd[index]==NULL) E1 gTrMo  
     continue; (,9cCnvmYU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?%fZvpn-  
    { `m0Uj9)#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8&[<pbN)  
     bProcessed=TRUE; ^3@a0J=F  
    } s{EX ;   
   } o0+BQ&A)s*  
  } ?)QBJ9F  
  else if((lParam&0xc000ffff)==1){ //有键按下 d`][1rZk  
   switch(wParam) lNeF>zz  
   { {-]HYk  
    case VK_MENU: ?g#t3j>zoF  
     MaskBits|=ALTBIT; 3&Zx*:  
     break; ex!w Y  
    case VK_CONTROL: Gy7x?  
     MaskBits|=CTRLBIT; Vwg|?sG_  
     break; `} Zbfe~  
    case VK_SHIFT: 1,!\7@<CT  
     MaskBits|=SHIFTBIT; yl+)I  
     break; Y52xrIvl\  
    default: //judge the key and send message @X><lz  
     break; 34M.xB   
   } csA.3|rv  
   for(int index=0;index<MAX_KEY;index++){ tnbs]6  
    if(hCallWnd[index]==NULL) 8GRr f2  
     continue; dC|#l?P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #$rT 4N c;  
    { $P9$ ,w4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `V2j[Fz  
     bProcessed=TRUE; gbv[*R{<%  
    } H D ^~4\%  
   } ={vtfgxl  
  } wmCV%g\.d:  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ;mKU>F<V  
   for(int index=0;index<MAX_KEY;index++){ Im1qWe  
    if(hCallWnd[index]==NULL) L*oL KigT  
     continue; I{ZPv"9j^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Zd/~ *ZA  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); &Zy=vk*  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 wyEgm:Vt  
   } [!efQap  
  } $5(%M8qmQ  
 } }ucg!i3C  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); `%I{l  
} ##ea-"m8  
#/=yz<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: ;9\0x  
Nmq5Tv  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m:<3d]L  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); d"a7{~l  
7%}}m&A7h  
  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: vXZz=E AH  
Z"KuS  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) T mE4p  
{ !h(0b*FUJ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) UimZ/\r  
 { pg`;)@  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ~i#xjD5  
  SaveBmp(); l:/V%{sx  
  return FALSE; o*BI^4  
 } CrQ& -!Eh  
 …… //其它处理及默认处理 rmoEc]kt]  
} ^Exq=oV  
e(N <Mf  
n=MYv(Pp}  
  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。 jM<Ihmh|  
7B :aJfxM  
  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。 -^"?a]B  
?q&mI*j!  
  二、编程步骤 ~H~4 fp b  
~[,TLg 6  
  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"; }=4".V`-o  
\{mJO>x  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; }#^F'%zf  
{XW>:EU'N  
  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; jd'R2e  
:|Ty 0>k  
  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; \./2Qc,  
;S j* {  
  5、 添加代码,编译运行程序。 0P >dXd)T  
yln.E vJjD  
三、程序代码 g5\B-3{  
\H12~=p`B  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL  e n":  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9?6$ 2I  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 7!)%%K.z6  
#if _MSC_VER > 1000 9>P(eN  
#pragma once 8r,%!70  
#endif // _MSC_VER > 1000 |th )Q  
#ifndef __AFXWIN_H__ w;_=$L'H&G  
#error include 'stdafx.h' before including this file for PCH J z b".A  
#endif AV! cCQ  
#include "resource.h" // main symbols ,"ZlY}!Gn  
class CHookApp : public CWinApp +y(h/NcQ  
{ e /Y+S;a  
 public: x{5*%}lX8  
  CHookApp(); PS1~6f"D  
  // Overrides Yw `VL)v(y  
  // ClassWizard generated virtual function overrides Rw% KEUDm  
  //{{AFX_VIRTUAL(CHookApp) z<*]h^ !3  
 public: Ca|;8ggf  
  virtual BOOL InitInstance(); "TI? qoz  
  virtual int ExitInstance(); WRM}gWv*  
  //}}AFX_VIRTUAL A/aQpEb%  
  //{{AFX_MSG(CHookApp) t]XJ q  
  // NOTE - the ClassWizard will add and remove member functions here. UkKpS L}Q2  
  // DO NOT EDIT what you see in these blocks of generated code ! (5 hu W7v  
  //}}AFX_MSG Op~+yMef  
  DECLARE_MESSAGE_MAP() `-m7CT sA  
}; w ?aLWySYT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ]Hq%Q~cE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  `SrVMb(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +=4b5*+qG  
BOOL InitHotkey(); 9b6h!(  
BOOL UnInit(); "Q4{6FH+mB  
#endif 1uMdgrJRR  
{lJpcS  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 39#>C~BOl  
#include "stdafx.h" _L>n!"E/  
#include "hook.h" X.qKG0i  
#include <windowsx.h> (ShJ!  
#ifdef _DEBUG 4LLCb7/5lP  
#define new DEBUG_NEW + >j_[O5Y  
#undef THIS_FILE g=Jfp$*[  
static char THIS_FILE[] = __FILE__; &baY[[N  
#endif s]UeDZ <a  
#define MAX_KEY 100 P])O\<)J  
#define CTRLBIT 0x04 =j-{Mxb3  
#define ALTBIT 0x02 3E-&8x7uYR  
#define SHIFTBIT 0x01 O8%/Id  
#pragma data_seg("shareddata") KW\`&ki  
HHOOK hHook =NULL; \)*qW[C$a  
UINT nHookCount =0; F_`Gs8- VH  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 5 B6:pH6e  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT (B5G?cB9  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey  3@*8\  
static int KeyCount =0; u#<]>EtbB  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 1)y}.y5S  
#pragma data_seg() (X/JXu{  
HINSTANCE hins; "^`AS"z'  
void VerifyWindow(); m{|n.b  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) A\>qoR!Y  
//{{AFX_MSG_MAP(CHookApp) &/p 9+gd  
// NOTE - the ClassWizard will add and remove mapping macros here. PR0]:t)E  
// DO NOT EDIT what you see in these blocks of generated code! /<~IKVz\&  
//}}AFX_MSG_MAP t*#T~3p  
END_MESSAGE_MAP() X@rAe37h+  
9L,T@#7  
CHookApp::CHookApp() qM'5cxe  
{ i fUgj8i_  
 // TODO: add construction code here, va\cE*,@ns  
 // Place all significant initialization in InitInstance PQ" Dl=,  
} h.NA$E?7  
Sj\8$QIXC  
CHookApp theApp; rE 8-MB  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $1YnQgpT  
{ 1ARIZ;H  
 BOOL bProcessed=FALSE; $l=m?r=  
 if(HC_ACTION==nCode) W;7cF8fu4  
 { G8VWx&RE  
  if((lParam&0xc0000000)==0xc0000000){// Key up BZ.H6r'Q  
   switch(wParam) Flsf5 Tr0  
   { Ex<0@Oz  
    case VK_MENU: sy;~(rpg  
     MaskBits&=~ALTBIT; DwPl,@T_i\  
     break; qmhHHFjQ  
    case VK_CONTROL: I~,*Rgv/Z  
     MaskBits&=~CTRLBIT; =x> KA*O1  
     break; MFrVGEQBRL  
    case VK_SHIFT: 3~ylBJJ  
     MaskBits&=~SHIFTBIT; occ}|u  
     break; 6Y=)12T  
    default: //judge the key and send message i{.!1i:  
     break; HzV3O-Qz]  
   } K7|BXGL8r8  
   for(int index=0;index<MAX_KEY;index++){ 6;Bqu5_Cj  
    if(hCallWnd[index]==NULL) gU:jx  
     continue; -4.+&'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _ . _'\  
    { 9#+X?|p+0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); pnWDsC~)  
     bProcessed=TRUE; cOSUe_S0w[  
    } TeHR,GB  
   } YC{od5a  
  } ] '..G-  
  else if((lParam&0xc000ffff)==1){ //Key down 2]|+.9B  
   switch(wParam) sNWj+T  
   { 92EvCtf  
    case VK_MENU: R"jX9~3Ln  
     MaskBits|=ALTBIT; 5Jd,]~KAP  
     break; yo5|~"yZY  
    case VK_CONTROL: 3LG)s:p$/  
     MaskBits|=CTRLBIT; se&:Y&vrc~  
     break; RaR$lcG+iY  
    case VK_SHIFT: cOcm9m#  
     MaskBits|=SHIFTBIT; 5=eGiF;0\  
     break; P6 9S[aqW  
    default: //judge the key and send message 7+fFKZFKF  
     break; r>V go):s  
   } 3/iGSG`  
   for(int index=0;index<MAX_KEY;index++) TWMD f  
   { x@yF|8  
    if(hCallWnd[index]==NULL) Zi^&x6y^  
     continue; uXXwMc<p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |,o!O39}>  
    { c}QjKJ-c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); rxO|k0x^C  
     bProcessed=TRUE; BQsy)H`4E  
    } _15r!RZ:1  
   } :2La,  
  } h<[o;E  
  if(!bProcessed){ Jf 2  
   for(int index=0;index<MAX_KEY;index++){ ?g 1%-F+  
    if(hCallWnd[index]==NULL) I%|W O*x  
     continue; \\_Qv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $%LjIeVA5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); p\Jz<dkN1  
   } J*.qiUAgW  
  } koFY7;_<?  
 } k@^)>J^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); LbnR=B!  
} {$b]K-B  
e(sQgtM6  
BOOL InitHotkey() %A04'dj`zQ  
{ .-{B  
 if(hHook!=NULL){ w _n)*he)z  
  nHookCount++; z"|^Y|`m  
  return TRUE; ^b'[ 81%  
 } A>Js`s  
 else K*>lq|i u  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); MbYAK-l.h  
  if(hHook!=NULL) 6#v"+V  
   nHookCount++; ZhW>H  
  return (hHook!=NULL); ))<3+^S0V\  
} RV-7y^[]^  
BOOL UnInit() 7cH[}v`pn  
{ fDf:Jec`[  
 if(nHookCount>1){ ~u3E+w  
  nHookCount--; Ao2t=vg  
  return TRUE; .Um.dXBYU  
 } @wb V@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ]h,XRDK  
 if(unhooked==TRUE){ +v/_R{ M  
  nHookCount=0; C,.$g>)MZK  
  hHook=NULL; 42mdak}\  
 } C*=#=.~~{  
 return unhooked; z>~Hc8*]3  
} ?Yxk1Y4ig)  
7Q2"]f,$CQ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \f .ceh;!  
{ bmFnsqo  
 BOOL bAdded=FALSE; 49cQA$Ad  
 for(int index=0;index<MAX_KEY;index++){ Z3)1!|#Q  
  if(hCallWnd[index]==0){ &jr'vS[b  
   hCallWnd[index]=hWnd; YvRMUT  
   HotKey[index]=cKey; h5>JBLawQP  
   HotKeyMask[index]=cMask; lUbQ@7a<'  
   bAdded=TRUE; YQLp#  
   KeyCount++; 4gzrxV  
   break; I8rtta  
  } YLk/16r  
 } s${ew.eW  
 return bAdded; 6"b =aPTi  
} 6x7pqH M  
jw]~g+x#$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) LNPwb1)  
{ u?r=;:N|y  
 BOOL bRemoved=FALSE; y ~7]9?T  
 for(int index=0;index<MAX_KEY;index++){ G$ ( B26  
  if(hCallWnd[index]==hWnd){ Ou>L|#=!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0P_qtS  
    hCallWnd[index]=NULL; g4^=Q'j-  
    HotKey[index]=0; 4*&_h g)h  
    HotKeyMask[index]=0; '#L.w6<B  
    bRemoved=TRUE; \L Gj]mb1  
    KeyCount--; V*U{q%p(  
    break; Ey4%N`H-^  
   } : A9G>qg  
  } gP:mZ7  
 } kdcr*7w  
 return bRemoved; ]lV\D8#  
} p'tB4V qT  
5 ELKL#(  
void VerifyWindow() Zl^#U c"  
{ bxLeQWr6  
 for(int i=0;i<MAX_KEY;i++){ +zn&DG0\X  
  if(hCallWnd!=NULL){ R9%Um6  
   if(!IsWindow(hCallWnd)){ 3Uw}!>`%  
    hCallWnd=NULL; '7Q5"M'  
    HotKey=0; ?B7n,!&~  
    HotKeyMask=0; 9x$Kb7'F  
    KeyCount--; uY{V^c#mv  
   } ziPE(B  
  } ,e<(8@BBL  
 } @ W[LA<  
} 8&+m5x S  
sTv;Ogs.  
BOOL CHookApp::InitInstance() %iMRJ}8(7  
{ jzt$  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); pu3ly&T#a_  
 hins=AfxGetInstanceHandle(); :!Ea.v  
 InitHotkey(); 5'*v-l,[  
 return CWinApp::InitInstance(); 4'9yMXR  
} {kVhht]X  
S&N[@G  
int CHookApp::ExitInstance() VjsQy>5m  
{ U (*k:Fw  
 VerifyWindow(); kB:6e7D|[  
 UnInit(); 6d4)7PL  
 return CWinApp::ExitInstance(); ZxW4 i  
} anxZ|DE  
 #4?Z|_j3  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file RHe'L36W  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Ky(=O1Ufu  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ x"7`,W  
#if _MSC_VER > 1000 JWzN 'a R  
#pragma once ] /w: 5o#  
#endif // _MSC_VER > 1000 KicPW}_  
9b88):[qO  
class CCaptureDlg : public CDialog BTi:Bcv k  
{ vOMmsU F  
 // Construction Bg3`w__l;  
 public: ,j^z];  
  BOOL bTray; <B"M} Y>_P  
  BOOL bRegistered; 1j4(/A  
  BOOL RegisterHotkey(); 1T96W :   
  UCHAR cKey; ~m@v ~=  
  UCHAR cMask; dB`3"aSN7  
  void DeleteIcon(); =\uQGH  
  void AddIcon(); wX7|a/|@  
  UINT nCount; c:>&iB-Yu  
  void SaveBmp(); 5ctH=t0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor t.f#_C\  
  // Dialog Data mV\QZfoF  
  //{{AFX_DATA(CCaptureDlg) YhpNeP{A  
  enum { IDD = IDD_CAPTURE_DIALOG }; gpt98:w:  
  CComboBox m_Key; 2pu8')'P  
  BOOL m_bControl; g3*" ^C2=  
  BOOL m_bAlt;  J^"  
  BOOL m_bShift; BC}+yS \  
  CString m_Path; X"'c2gaa_  
  CString m_Number; T8*<  
  //}}AFX_DATA O:K={#Xj  
  // ClassWizard generated virtual function overrides `VJJ"v<L  
  //{{AFX_VIRTUAL(CCaptureDlg) R> r@[$z+  
 public: vbXZZ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); +*Um:}&  
 protected: Jng,:$sZ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ctqXzM `  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); _hK83s4  
  //}}AFX_VIRTUAL U2~7qC,!Do  
  // Implementation '8O(J7J  
 protected: yDk|ad|  
  HICON m_hIcon; gA`x-`  
  // Generated message map functions N^u,C$zP9C  
  //{{AFX_MSG(CCaptureDlg) dM|&Y6  
  virtual BOOL OnInitDialog(); 7*D*nY4+  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); MJxTzQE  
  afx_msg void OnPaint(); P8Nzz(JF  
  afx_msg HCURSOR OnQueryDragIcon(); XnBpL6"T`  
  virtual void OnCancel(); Ry5/O?Q L  
  afx_msg void OnAbout(); _4H}OGZI  
  afx_msg void OnBrowse(); <X5'uve  
  afx_msg void OnChange();  3)5Gzn  
 //}}AFX_MSG ^7cZ9/3  
 DECLARE_MESSAGE_MAP() wTT_jyH)  
}; g`(' k5=  
#endif =SY5E{`4p  
aN\ps g  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file yW3X<  
#include "stdafx.h" X[F<sxw  
#include "Capture.h" XI>|"*-l  
#include "CaptureDlg.h" aqa%B  
#include <windowsx.h> T!GX^nn*O  
#pragma comment(lib,"hook.lib") IIn0w2:i  
#ifdef _DEBUG 1O<Gg<<,e  
#define new DEBUG_NEW 5)%bnLxn  
#undef THIS_FILE GoVB1)  
static char THIS_FILE[] = __FILE__; G'*_7HD  
#endif H[K(Tt4<&  
#define IDM_SHELL WM_USER+1 a-P 'h1hbH  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "Zu hN(-`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -85]x)JE  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ~hJ/&,vH!  
class CAboutDlg : public CDialog ;THb6Jz/+  
{ M!KHBr  
 public: 8UA bTqB-  
  CAboutDlg(); hN~]$"@2  
  // Dialog Data 8(GH.)I+0  
  //{{AFX_DATA(CAboutDlg) Mo4#UV  
  enum { IDD = IDD_ABOUTBOX }; <4caG2~q  
  //}}AFX_DATA m~upTQz  
  // ClassWizard generated virtual function overrides 8|\0\Wd;vu  
  //{{AFX_VIRTUAL(CAboutDlg) ct,Iu+HJ  
 protected: m5m'ByX(*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support caK<;bmu-  
  //}}AFX_VIRTUAL @O~  
  // Implementation ;H%&Jht  
 protected: T2;%@Ghc  
  //{{AFX_MSG(CAboutDlg) hWzjn5w3  
  //}}AFX_MSG j\,HquTR  
  DECLARE_MESSAGE_MAP() 37 #|X*L  
}; KK}?x6wV0,  
=N _7DT  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) P|rsq|',  
{ Afpj*o  
 //{{AFX_DATA_INIT(CAboutDlg) h"mG\xi  
 //}}AFX_DATA_INIT Y Mes314"  
} +3@d]JfMh  
yQ^k%hHa  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) I=N;F6  
{ bu;3Ib3\  
 CDialog::DoDataExchange(pDX); XDtr{r6z  
 //{{AFX_DATA_MAP(CAboutDlg) D][e uB  
 //}}AFX_DATA_MAP %SWtE5HZQq  
} [31vx0$_p  
^qs{Cf$  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) )X8?m <cG  
 //{{AFX_MSG_MAP(CAboutDlg) 3ug|H  
 // No message handlers W%/lBkP  
 //}}AFX_MSG_MAP fx W,S  
END_MESSAGE_MAP() L&C<-BA/  
nG0Uv%?{pj  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) t>04nN_@,s  
: CDialog(CCaptureDlg::IDD, pParent) 8 *Fr=+KN  
{ -c^/k_n  
 //{{AFX_DATA_INIT(CCaptureDlg) P)7_RE*gY  
  m_bControl = FALSE; .zm'E<  
  m_bAlt = FALSE; Je|D]w  
  m_bShift = FALSE; f zu#!  
  m_Path = _T("c:\\"); (9;qV:0`  
  m_Number = _T("0 picture captured."); EYe)d+E*  
  nCount=0; S6.N)7y  
  bRegistered=FALSE; 0YMmWxV  
  bTray=FALSE; LU#DkuIG  
 //}}AFX_DATA_INIT $6~ \xe=  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 R~z@voM*<  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); \ 2Jr( ?U  
} ;%Z%]nIS  
EYwDv4H,g  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) \u|8MEB  
{ i-Le&  
 CDialog::DoDataExchange(pDX); 0(owFNUBs  
 //{{AFX_DATA_MAP(CCaptureDlg) #3:;&@#  
  DDX_Control(pDX, IDC_KEY, m_Key); ]Q}z-U  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); |( %3 '"Z  
  DDX_Check(pDX, IDC_ALT, m_bAlt); wH:'5+u:6  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 2>s@2=Aq  
  DDX_Text(pDX, IDC_PATH, m_Path); won(HK\1p  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Ov vM)?^#  
 //}}AFX_DATA_MAP >s@6rNgf  
} Cm4$&?  
X%S9 H^9  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) N XAP=y3  
//{{AFX_MSG_MAP(CCaptureDlg) ;l]OmcL  
 ON_WM_SYSCOMMAND() |+?ABPk"  
 ON_WM_PAINT() =y3gnb6  
 ON_WM_QUERYDRAGICON() w|6;Pf~1y)  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) jGB2`^&d  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >R5qhVYFb  
 ON_BN_CLICKED(ID_CHANGE, OnChange) PB !\r}Q  
//}}AFX_MSG_MAP 'o2V}L'nG  
END_MESSAGE_MAP() YF{KSGq  
7=.}484>J  
BOOL CCaptureDlg::OnInitDialog() 4<`x*8` ,  
{ fo"dX4%}  
 CDialog::OnInitDialog(); u9AXiv+K  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 'E/vE0nN?  
 ASSERT(IDM_ABOUTBOX < 0xF000); m"B)%?C#  
 CMenu* pSysMenu = GetSystemMenu(FALSE); l8n}&zX  
 if (pSysMenu != NULL) Z%*_kk  
 { (n&Hjz,Fv  
  CString strAboutMenu; b"Hg4i)  
  strAboutMenu.LoadString(IDS_ABOUTBOX); O5PCR6U  
  if (!strAboutMenu.IsEmpty()) cJ 5":^O  
  { i!/V wGg  
   pSysMenu->AppendMenu(MF_SEPARATOR); C[j'0@~V:B  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);  T)o)%Yv  
  } ;SBM7fwRk  
 } @Q"%a`mKH  
 SetIcon(m_hIcon, TRUE); // Set big icon &hmyfH&S  
 SetIcon(m_hIcon, FALSE); // Set small icon c;,jb  
 m_Key.SetCurSel(0); C9-90,  
 RegisterHotkey(); {5+t\~q$  
 CMenu* pMenu=GetSystemMenu(FALSE); s'LY)_n  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); v})0zz?,1  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); `sZ/'R6  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); YW@Ad  
 return TRUE; // return TRUE unless you set the focus to a control 6gS<h \h0  
} =bUVGjr%96  
!<"H73?fl  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) -9"hJ4  
{ f-5vE9G3y7  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^>?gFvWB%  
 {  D7%`hU  
  CAboutDlg dlgAbout; S3-3pJ]~Zk  
  dlgAbout.DoModal(); [YT"UVI  
 } C7%+1w'D8  
 else L+@RK6dq  
 { M9MfO*  
  CDialog::OnSysCommand(nID, lParam); I;`)1   
 } Rv=(D^F,  
} 6:i(<7  
#UH|,>W6  
void CCaptureDlg::OnPaint() Q!Rknj 2  
{ 3=!\>0;E-  
 if (IsIconic()) V0mWY!i  
 { Y_&D W4  
  CPaintDC dc(this); // device context for painting z JWh  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); I:s#,! >  
  // Center icon in client rectangle 4#mRLs'  
  int cxIcon = GetSystemMetrics(SM_CXICON); Lwgk}!KR  
  int cyIcon = GetSystemMetrics(SM_CYICON); sygAEL;.  
  CRect rect; `B;^:u  
  GetClientRect(&rect); ugg08am!  
  int x = (rect.Width() - cxIcon + 1) / 2; `.+_}.m  
  int y = (rect.Height() - cyIcon + 1) / 2; d$<HMs:o@  
  // Draw the icon #RoGyrLo  
  dc.DrawIcon(x, y, m_hIcon); rlYAy5&  
 } V7u;"vD  
 else T78`~-D4<  
 { l]whL1N3  
  CDialog::OnPaint(); kUAjQ>  
 } 2<Pi2s'  
} vMJv.O>HW  
^JF6L`Tp  
HCURSOR CCaptureDlg::OnQueryDragIcon() p=6Q0r|'  
{ >\hu1C|W  
 return (HCURSOR) m_hIcon; //VgPl  
} +*[lp@zU{  
;4of7d  
void CCaptureDlg::OnCancel() qp>O#tj[  
{ |yiM7U,i  
 if(bTray) t&(}`W  
  DeleteIcon(); j+Nun  
  CDialog::OnCancel(); KFHn)+*"  
} UJ1Ui'a(!!  
D0,U2d  
void CCaptureDlg::OnAbout() &eq>>  
{ v\ggFrG]  
 CAboutDlg dlg; FbQ"ZTN\;Y  
 dlg.DoModal(); +DS_'Tmr  
} ;X6FhQ;{*0  
*M;!{)m?  
void CCaptureDlg::OnBrowse() -~eNC^t;W  
{ !+& "y K@J  
 CString str; BY"<90kBL  
 BROWSEINFO bi; >6 [{\uPK  
 char name[MAX_PATH]; Px&*&^Gf[b  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); [ Y.3miE  
 bi.hwndOwner=GetSafeHwnd(); xn(lkQ6Fm  
 bi.pszDisplayName=name; P6* IR|  
 bi.lpszTitle="Select folder"; *+h2,Z('a  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 17[7)M88  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); G 8OLx+!0e  
 if(idl==NULL) $O,$KAC  
  return; 2SEfEkk  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <jXXj[M2  
 str.ReleaseBuffer(); # )-Kf  
 m_Path=str; 6sBS;+C  
 if(str.GetAt(str.GetLength()-1)!='\\') LhC%`w  
  m_Path+="\\"; m\|I.BUG  
 UpdateData(FALSE); MGeHccqh2  
} a6"Pe07t  
|Vc8W0~0  
void CCaptureDlg::SaveBmp() L%9DaK  
{ DLe?@R5  
 CDC dc; jx a?  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); cP63q|[[  
 CBitmap bm; j?4k{?x  
 int Width=GetSystemMetrics(SM_CXSCREEN); W!4(EdT*Cq  
 int Height=GetSystemMetrics(SM_CYSCREEN); ; k{w@L.@  
 bm.CreateCompatibleBitmap(&dc,Width,Height); .r+u pY  
 CDC tdc; #R<4K0Xan  
 tdc.CreateCompatibleDC(&dc); Epsc2TuH7  
 CBitmap*pOld=tdc.SelectObject(&bm); s2)a8 <  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); _7? o/Q?F%  
 tdc.SelectObject(pOld); *[@lp7  
 BITMAP btm; a+ZP]3@ 7  
 bm.GetBitmap(&btm); P31}O2 Nh  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; MrEyN8X  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size);  Ko9"mHNB  
 BITMAPINFOHEADER bih; ]N!382  
 bih.biBitCount=btm.bmBitsPixel; *@|d7aiO  
 bih.biClrImportant=0; IQxY]0\uf6  
 bih.biClrUsed=0; %M^X>S\%  
 bih.biCompression=0; #DpDmMP9R3  
 bih.biHeight=btm.bmHeight; Qy`{y?T2  
 bih.biPlanes=1; Am&/K\O  
 bih.biSize=sizeof(BITMAPINFOHEADER); ENm\1  
 bih.biSizeImage=size; F)g.CDQ!c  
 bih.biWidth=btm.bmWidth; :<f7;.  
 bih.biXPelsPerMeter=0; K?:rrd=7q  
 bih.biYPelsPerMeter=0; '}4LHB;:  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @V:4tG.<sw  
 static int filecount=0; W&dYH 4O  
 CString name; c*$&MCh  
 name.Format("pict%04d.bmp",filecount++); tKgPKWP   
 name=m_Path+name; =z^v)=uhp  
 BITMAPFILEHEADER bfh; G\&4_MS  
 bfh.bfReserved1=bfh.bfReserved2=0; hX(:xc  
 bfh.bfType=((WORD)('M'<< 8)|'B'); UbKdB  
 bfh.bfSize=54+size; TWkuR]5  
 bfh.bfOffBits=54; o%X@Bz  
 CFile bf; :a#Mq9ph!  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ bS_fWD-  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); p6u"$)wt  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Tq[=&J  
  bf.WriteHuge(lpData,size); 9{\e E]0  
  bf.Close(); vQ"EI1=7Z  
  nCount++; K0_/;a] |  
 } `J \1t K{  
 GlobalFreePtr(lpData); y)o!F^  
 if(nCount==1) 833KU_ N  
  m_Number.Format("%d picture captured.",nCount); l/0TNOA  
 else 9{_D"h}}  
  m_Number.Format("%d pictures captured.",nCount); X>l  
  UpdateData(FALSE); @1ZLr  
} UO$z_ p]w  
nAv@^G2  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) R4v)}`x  
{ +[M5x[[$  
 if(pMsg -> message == WM_KEYDOWN) ;|&Ak_I2G  
 { YFgQ!\&59  
  if(pMsg -> wParam == VK_ESCAPE) *.4;7#  
   return TRUE; AHX_I  
  if(pMsg -> wParam == VK_RETURN) 4HEp}Y"}V  
   return TRUE; VE1 B"s</  
 } RGh `=D/yE  
 return CDialog::PreTranslateMessage(pMsg); M0g!"0?  
} ~E&drl\  
Wo&10S w  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f@&C \  
{ g-j`Ex%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ hyv*+FV;  
  SaveBmp(); X+"8yZz3?  
  return FALSE; 94Mh/A9k  
} _UKH1qUd4  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Ag QR"Nu6  
 CMenu pop; sI4Ql0[  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 8"l9W=  
 CMenu*pMenu=pop.GetSubMenu(0); g &~T X  
 pMenu->SetDefaultItem(ID_EXITICON); }3 NGMGu$  
 CPoint pt; ]X/1u"  
 GetCursorPos(&pt); $[txZN  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Ld6j;ZJ';  
 if(id==ID_EXITICON) uSp=,2)  
  DeleteIcon(); 3lYM(DT  
 else if(id==ID_EXIT) N}Ozm6Mc  
  OnCancel(); +~mBo+ ,  
 return FALSE; l}B,SkP^  
} 2ijw g~_@  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); H~x,\|l#  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) (r,tU(  
 AddIcon(); Iu`eQG  
 return res; TMZg GUn  
} |r_S2)zH9m  
1HK5OT&  
void CCaptureDlg::AddIcon() ~_=ohb{  
{ O{hGh{y  
 NOTIFYICONDATA data; "P;_-i9O  
 data.cbSize=sizeof(NOTIFYICONDATA); KIO{6  
 CString tip; -:wC 920+  
 tip.LoadString(IDS_ICONTIP); [X[d`@rXv  
 data.hIcon=GetIcon(0); k r2V  
 data.hWnd=GetSafeHwnd(); |u,2A1  
 strcpy(data.szTip,tip); ~$ } `R=  
 data.uCallbackMessage=IDM_SHELL; :{<( )gfk  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; W _(  
 data.uID=98; -~T?xs0_  
 Shell_NotifyIcon(NIM_ADD,&data); v`8dRVN  
 ShowWindow(SW_HIDE); y)_T!&ze  
 bTray=TRUE; Pda(O;aNU  
} &A>Hq/Y  
Y0iL+=[k`m  
void CCaptureDlg::DeleteIcon() is_`UDaB  
{ f.rc~UI?  
 NOTIFYICONDATA data; Z{nJ\`  
 data.cbSize=sizeof(NOTIFYICONDATA); z1A[rbe=4w  
 data.hWnd=GetSafeHwnd(); 5at\!17TY  
 data.uID=98; ]5b%r;_  
 Shell_NotifyIcon(NIM_DELETE,&data); ._JM3o}F  
 ShowWindow(SW_SHOW); biFy*+|  
 SetForegroundWindow(); %9hzz5#  
 ShowWindow(SW_SHOWNORMAL); o =)hUr  
 bTray=FALSE; ^Z]1Z  
} D/C,Q|Ya6  
y1P KoN|K  
void CCaptureDlg::OnChange() `iuo([E d  
{ }ybveZxv5A  
 RegisterHotkey(); ;\yY*  
} > E;`;b  
Wi]Mp7b  
BOOL CCaptureDlg::RegisterHotkey() ]0<T,m Z  
{ sLh9= Kh`  
 UpdateData(); BhC.#u/   
 UCHAR mask=0; ++ !BSQ e  
 UCHAR key=0; )HWf`;VQ  
 if(m_bControl) @mM'V5_#  
  mask|=4; A9^t$Ii  
 if(m_bAlt) bQc-ryC+.  
  mask|=2; yZFm<_9>  
 if(m_bShift) [U[saR\  
  mask|=1; #x Z7%    
  key=Key_Table[m_Key.GetCurSel()]; 'ms&ty*T  
 if(bRegistered){ Dl hb'*@  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); f%ude@E3  
  bRegistered=FALSE; 2VaQxctk  
 } =y.!Ny5A  
 cMask=mask; y)N57#e  
 cKey=key; o#Q0J17i?  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >]uV  
 return bRegistered; |~vo  
} 1?s]nU  
Sgp$B:  
  四、小结 lN"%~n?  
  )z#  
  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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