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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: aa`(2%(:  
  lmvp,BzC  
  一、实现方法 h'):/}JPl  
2Wz8E2.  
  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: _\}'5nmw\  
d,V#5l-6  
#pragma data_seg("shareddata") 4Z( #;9f  
HHOOK hHook =NULL; //钩子句柄 ^dHQ<L3.*  
UINT nHookCount =0; //挂接的程序数目 N1c=cZDV  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 z1PwupXt1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 <Kd(fFe  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Q+ ^ &  
static int KeyCount =0; V&M*,#(?  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 3'0Pl8  
#pragma data_seg() =?<WCR C*  
 `Vb  
  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。 ]:<! (  
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  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: dAh.I3  
{LO Pm1K8Y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR r9i? H  
cKey,UCHAR cMask) ;]>kp^C#  
{ E-bswUVaEE  
 BOOL bAdded=FALSE; z)qYW6o%  
 for(int index=0;index<MAX_KEY;index++){ tS'lJu  
  if(hCallWnd[index]==0){ Fb5U@X/vE  
   hCallWnd[index]=hWnd; k$w~JO!s  
   HotKey[index]=cKey; EKwQ$?I  
   HotKeyMask[index]=cMask; \G" S7  
   bAdded=TRUE; M&Ka ^h;N  
   KeyCount++; =ejj@c  
   break; 8M,*w6P  
  } A`c%p7Z%  
 } Ps!MpdcL3  
 return bAdded; { mi}3/  
} SB_Tzp  
//删除热键 ]pax,| +$C  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z%;p lMj  
{ iC gZ3M]  
 BOOL bRemoved=FALSE; kQ`tY`3F  
 for(int index=0;index<MAX_KEY;index++){ LKIMT  
  if(hCallWnd[index]==hWnd){ =3e7n2N)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ B$4*U"tk  
    hCallWnd[index]=NULL; 3S0.sU~_U  
    HotKey[index]=0; {3~VLdy  
    HotKeyMask[index]=0; ?\}Gi(VVE  
    bRemoved=TRUE; uN|A}/hr]  
    KeyCount--; `g)}jo`W  
    break; d7OygDb<  
   } MMM tB6  
  } 3Vb4zZsl  
 } 6>>; fy2  
 return bRemoved; Dyo v}y  
} ) r2Y@+.FN  
_bFUr  
M";qo6  
  DLL中的钩子函数如下: 3nq?Y8yac  
+)Z]<O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) fE#(M+(<  
{ M tN>5k c  
 BOOL bProcessed=FALSE; CVj^{||eF  
 if(HC_ACTION==nCode) oaY_6  
 { ;O"?6d0  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 f-ltV<C_  
   switch(wParam) *c0H_8e  
   {  BQ@7^E[  
    case VK_MENU: XH%L]  
     MaskBits&=~ALTBIT; \iuR+I  
     break; U<Pjn)M~B  
    case VK_CONTROL: p8 rh`7  
     MaskBits&=~CTRLBIT; l& :EKh  
     break; ]K=#>rZrB  
    case VK_SHIFT: ( ;FxKm<P@  
     MaskBits&=~SHIFTBIT; eA/n.V$z  
     break; $@g]?*L:  
    default: //judge the key and send message ~6[?=mOi'  
     break; ]P4WfV d  
   } R=D]:u<P  
   for(int index=0;index<MAX_KEY;index++){ Njq}M/{U  
    if(hCallWnd[index]==NULL) wu41Mz7  
     continue; vwCQvt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rPV Q#iB  
    { 8Sbz)X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [);oj<  
     bProcessed=TRUE; DiCz%'N  
    } z+"tAVB[i  
   } uZqL'l+/y  
  } X8Z?G,[H  
  else if((lParam&0xc000ffff)==1){ //有键按下 t*{L[c9.Uq  
   switch(wParam) U( YAI%O  
   { +&GV-z~o  
    case VK_MENU: #NS|9jW  
     MaskBits|=ALTBIT; ]z'&oz  
     break; =~D? K9o  
    case VK_CONTROL: Kkvc Zs'4m  
     MaskBits|=CTRLBIT; L 4By5)  
     break; <I+kB^Er  
    case VK_SHIFT: dbp\tWaW  
     MaskBits|=SHIFTBIT; :6n#y-9^1  
     break; E)"19l|}B  
    default: //judge the key and send message k[6J;/  
     break; B}e/MlX3M  
   } nzq   
   for(int index=0;index<MAX_KEY;index++){ rTPgHK]?l  
    if(hCallWnd[index]==NULL)  ~?ab_CY  
     continue; ^7gGtz2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t^s&1#iC  
    { &i#$ia r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); LC%o coc  
     bProcessed=TRUE; -IPo/?}  
    } <r%K i`u(p  
   } +;N]34>S7  
  } LGP"S5V  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 r $7.  
   for(int index=0;index<MAX_KEY;index++){ CSM"Kz`  
    if(hCallWnd[index]==NULL) AIF ?>wgq  
     continue; mH o#"tc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) gf|uZ9{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); S?J!.(  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 0w?da~  
   } 2d)Dhxzxk  
  } L%'J]HL-  
 } 8 Rx@_   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); l|CM/(99-  
} ["-rD y P  
z0"t]4s  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: <Ap_#  
r- 8Awa  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^y+k6bE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); mdi!Q1pS  
L9b.D<  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: s~M4. 06P  
+^.Yt0}  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) u mYsO.8  
{ ]so/AdT9hA  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) crmQn ^4\  
 { ~_THvx1  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 M2$/x`\-~  
  SaveBmp(); 0~|0D#klB  
  return FALSE; aLk3Yg@X  
 } fSo8O  
 …… //其它处理及默认处理 19 5_1?'<  
} 0'^M}&zCi  
<Q[%:LD  
 3Y#Q'r?  
  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。 ~i,d%a  
&l(T},-X  
  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。 7)?C+=,0  
x:SjdT  
  二、编程步骤 w$]G$e  
)nUdU = m  
  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"; _c5@)I~  
L&\W+k  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ym;]3<I?I[  
l*CulVX  
  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; g2OnLEF]s  
,@*5x'auK  
  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; ]_KWN$pd  
$LP(\T([  
  5、 添加代码,编译运行程序。 _i =*0Q  
eI8o#4nT  
三、程序代码 * #yF`_p  
hf`y_H+\7  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL WowKq0sn  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) `M@ESA (e  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ h ldZA  
#if _MSC_VER > 1000 xP8/1wd.  
#pragma once #MC#K{Xd  
#endif // _MSC_VER > 1000 &;Ncc,jb  
#ifndef __AFXWIN_H__ K,4Ig!  
#error include 'stdafx.h' before including this file for PCH z#{Y>.b  
#endif ,&[o:jTk  
#include "resource.h" // main symbols I4Do$&9<D  
class CHookApp : public CWinApp CD1Ma8I8  
{ SKG U)Rn;  
 public: Np\NStx2  
  CHookApp(); 3u@,OE  
  // Overrides #}A"yo  
  // ClassWizard generated virtual function overrides ={g"cx  
  //{{AFX_VIRTUAL(CHookApp) pte\1q[N  
 public: q <}IO  
  virtual BOOL InitInstance(); h#1:ypA6l  
  virtual int ExitInstance(); =dXHQU&Q  
  //}}AFX_VIRTUAL )nd^@G^  
  //{{AFX_MSG(CHookApp) vJE=H9E  
  // NOTE - the ClassWizard will add and remove member functions here. *|&Y ,H?  
  // DO NOT EDIT what you see in these blocks of generated code ! g *5_m(H  
  //}}AFX_MSG g[cnaS|?  
  DECLARE_MESSAGE_MAP() u#6s^ )W  
}; [s}W47N1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); !@C-|=9G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Zpd-ob  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'o='Q)Dk  
BOOL InitHotkey(); /_{-~0Z=@B  
BOOL UnInit(); T;u;r@R/  
#endif P@y)K!{Nk  
r CJ$Pl9R  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. *`a$6F7m4  
#include "stdafx.h" 3.movkj  
#include "hook.h" ]& D dy&V  
#include <windowsx.h> C  eEhe  
#ifdef _DEBUG }B%9cc  
#define new DEBUG_NEW *r.% /^@  
#undef THIS_FILE b+Q{Z*  
static char THIS_FILE[] = __FILE__; +2[0q% i  
#endif QL0q/S1*  
#define MAX_KEY 100 'a(y]QG  
#define CTRLBIT 0x04 ximVh}'a  
#define ALTBIT 0x02 4s{=/,f  
#define SHIFTBIT 0x01 {OG1' m6=/  
#pragma data_seg("shareddata") gs<~)&x  
HHOOK hHook =NULL; `.@udfog^0  
UINT nHookCount =0; &Wy>t8DIK  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey B9(w^l$kZ|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT EH".ki=e  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey r'noB<| e  
static int KeyCount =0; 2)BO@]n  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift W@!qp  
#pragma data_seg() UVDMYA0  
HINSTANCE hins; O 0}uY:B  
void VerifyWindow(); 7\@c1e*e  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) UDHOcb  
//{{AFX_MSG_MAP(CHookApp) NXD-  
// NOTE - the ClassWizard will add and remove mapping macros here. y,?=,x}o#  
// DO NOT EDIT what you see in these blocks of generated code! =1Plu5  
//}}AFX_MSG_MAP C\{A|'l!x  
END_MESSAGE_MAP() nscnG5'{+  
5,xPB5pK  
CHookApp::CHookApp() +B{u,xgg  
{ oVK?lQ~y  
 // TODO: add construction code here, ) [eTZg  
 // Place all significant initialization in InitInstance _J*l,]}S  
} qt:B]#j@  
OX,em Ti  
CHookApp theApp; %C%3c4+Oh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "%K'~"S#Q,  
{ H~*N:$C  
 BOOL bProcessed=FALSE; Az8b_:=  
 if(HC_ACTION==nCode) K0>;4E>B  
 { ;9~YQW@|  
  if((lParam&0xc0000000)==0xc0000000){// Key up IAA_Ft  
   switch(wParam) F]RPM(!5O)  
   { ,wf_o%'eW  
    case VK_MENU:  x,: k/]  
     MaskBits&=~ALTBIT; JbEEI(Q>g  
     break; k8G4CFg}wP  
    case VK_CONTROL: PY|zN|  
     MaskBits&=~CTRLBIT; ZQ"dAR/y  
     break; P%B|HnG^  
    case VK_SHIFT: <\nM5-wR  
     MaskBits&=~SHIFTBIT; Tkr~)2,(I!  
     break; O:v#M]   
    default: //judge the key and send message .joCZKO  
     break; ]prw=rD  
   } E2l" e?AN~  
   for(int index=0;index<MAX_KEY;index++){ WiH8j$;xu  
    if(hCallWnd[index]==NULL) H/t0#  
     continue; \[!{tbK`2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >07i"a  
    { I!b"Rv=Nf-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ju:}%'  
     bProcessed=TRUE; kM-8%a2i  
    } vEjf|-Mb9  
   } R;,5LS&*a  
  } shGUG;  
  else if((lParam&0xc000ffff)==1){ //Key down _I)TO_L;  
   switch(wParam) uv5NqL&  
   { q'fOlq  
    case VK_MENU: ^G qO>1U  
     MaskBits|=ALTBIT; xqdkc^b  
     break; krGIE}5  
    case VK_CONTROL: `?T::&`  
     MaskBits|=CTRLBIT; YS4"TOFw  
     break; Qraq{'3  
    case VK_SHIFT: yl*%P3m|  
     MaskBits|=SHIFTBIT; ZYY`f/qi  
     break;  Jj%xLv%  
    default: //judge the key and send message };r EN`L  
     break; gWro])3  
   } m, +E5^  
   for(int index=0;index<MAX_KEY;index++) :bo2H[U+  
   { 3hkEjR  
    if(hCallWnd[index]==NULL) r}Vr_  
     continue; Ww~C[8q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +dCR$<e9r  
    { uJ|,-"~F  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); j*?E~M.'1K  
     bProcessed=TRUE; ?gu!P:lZS  
    } Na]ITCVR  
   } Tb^1#O  
  } `?^<r%*F.  
  if(!bProcessed){ zgS)j9q}  
   for(int index=0;index<MAX_KEY;index++){ ys)  
    if(hCallWnd[index]==NULL) 8/B8yY-O  
     continue; 3f>9tUWhTy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 8bw, dBN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); zn'Mi:O'p  
   } c.Izm+9k  
  } {OQ)Np!  
 } ^-Ks_4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); AN,3[Sh  
} \k$cg~  
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BOOL InitHotkey() o7gZc/?n  
{ F:Vl\YZ  
 if(hHook!=NULL){ , iEGf-!k  
  nHookCount++; ]c\`EHN  
  return TRUE; f&F9ImZ  
 } g \+!+!"~  
 else 7h. [eMLPB  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); <}mA>c'k  
  if(hHook!=NULL) U_9|ED:  
   nHookCount++; W`[7|8(6!  
  return (hHook!=NULL); $Q|6W &?[;  
} .|:(VG$MfI  
BOOL UnInit() ~ hP]<$v  
{ <,*w$  
 if(nHookCount>1){ ko{&~   
  nHookCount--; yqJ>Z%)hf  
  return TRUE; _4{3^QZq5  
 } i*xVD`x~  
 BOOL unhooked = UnhookWindowsHookEx(hHook); dF|n)+C~R  
 if(unhooked==TRUE){ #BEXj<m+J  
  nHookCount=0; >0:=<RW  
  hHook=NULL; |+-b#Sa9  
 } Nog{w  
 return unhooked; JBV 06T_4o  
} G]-\$>5R  
.F/l$4CQ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ieOw&  
{ FIJ]`  
 BOOL bAdded=FALSE; (h&=N a~  
 for(int index=0;index<MAX_KEY;index++){ ) [)1  
  if(hCallWnd[index]==0){ SQ/}K8uZ  
   hCallWnd[index]=hWnd; G{+zKs}~  
   HotKey[index]=cKey; gYpFF=7j<@  
   HotKeyMask[index]=cMask; %~dn5t ;  
   bAdded=TRUE; qe uc^+P;  
   KeyCount++; us#ji i.<  
   break; |o_ N$70  
  } - Lsl  
 } =m;cy0))  
 return bAdded; HT_nxe`E  
} %~<F7qB  
mt *Dx  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 47 &p*=  
{ KrTlzbw&p\  
 BOOL bRemoved=FALSE; meD83,L~N  
 for(int index=0;index<MAX_KEY;index++){ kCZ'p  
  if(hCallWnd[index]==hWnd){ Fe2iG-ec  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8P%Jky&(  
    hCallWnd[index]=NULL; EBmkKiI;  
    HotKey[index]=0; ?;rRR48T9E  
    HotKeyMask[index]=0; 9:!V":8q  
    bRemoved=TRUE; >(gbUW  
    KeyCount--; B .?@VF  
    break; 4E$6&,\  
   } ?R@u'4yK  
  } V4*/t#L/  
 } bM,%+9oz;  
 return bRemoved; Z%{`j!!p  
} [Z[ p@Ux  
2"Ki5  
void VerifyWindow() BS?rKtdm(  
{ _:XX+ 3W7  
 for(int i=0;i<MAX_KEY;i++){ gp\o|igT  
  if(hCallWnd!=NULL){ %pxHGO=)E  
   if(!IsWindow(hCallWnd)){ %8KbVjn  
    hCallWnd=NULL; cS",Bw\  
    HotKey=0; 5n=~l[O  
    HotKeyMask=0; wWJM./y  
    KeyCount--; -+Ox/>k  
   } ocj^mxh =O  
  } KpKZiUQm  
 } K &G  
} tRR<4}4R  
_]kw |[)  
BOOL CHookApp::InitInstance() ?J5E.7o  
{ T mH5+  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); zrA =?[  
 hins=AfxGetInstanceHandle(); P9gAt4i  
 InitHotkey(); d`xDv$QZ  
 return CWinApp::InitInstance(); "2 qivJ  
} F,xFeq$/{  
239g pf]}  
int CHookApp::ExitInstance() d?[8VfAnh  
{ GS,}]c=  
 VerifyWindow(); Ye\ &_w"  
 UnInit(); [58qC:  
 return CWinApp::ExitInstance(); :W[d&e  
} s&W^?eKr  
U5;Y o+z  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file LV]F?O[K=  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) p=dM2>  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Ix.Y_}  
#if _MSC_VER > 1000 bl8y o4  
#pragma once E(an5x/r  
#endif // _MSC_VER > 1000 LHusy;<E[  
U1pwk[  
class CCaptureDlg : public CDialog pE]s>T a  
{ (+9^)No  
 // Construction o[k,{`M0  
 public: %xwtG:IKEV  
  BOOL bTray; zRA,Yi4;+  
  BOOL bRegistered; u:}yE^8@  
  BOOL RegisterHotkey();  rUBc5@|  
  UCHAR cKey; pq*4yaTT'  
  UCHAR cMask; 9{R88f?;  
  void DeleteIcon(); (+.R8  
  void AddIcon(); MgQb" qx  
  UINT nCount; "tU,.U  
  void SaveBmp(); *qw//W   
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor bP1]:^ x@W  
  // Dialog Data ?_@Mg\Hc  
  //{{AFX_DATA(CCaptureDlg) QjFE  
  enum { IDD = IDD_CAPTURE_DIALOG }; .10$n*  
  CComboBox m_Key; 82w=t  
  BOOL m_bControl; $+w-r#,  
  BOOL m_bAlt; wGx*Xy1n<  
  BOOL m_bShift; q4KYC!b  
  CString m_Path; Z:<6Ck  
  CString m_Number; NfXEW-  
  //}}AFX_DATA oedLe9!  
  // ClassWizard generated virtual function overrides Si=u=FI1e  
  //{{AFX_VIRTUAL(CCaptureDlg) [_3L  
 public: f5vsxP)Y[  
  virtual BOOL PreTranslateMessage(MSG* pMsg); X/<Q3AK  
 protected: }&/_ S  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support B&z~}lL  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); e-YMFJtoK}  
  //}}AFX_VIRTUAL 2PEA<{u  
  // Implementation pa6-3c  
 protected: z 5IdYF?  
  HICON m_hIcon; c~n:xblv  
  // Generated message map functions <):= mr7  
  //{{AFX_MSG(CCaptureDlg) ; Ne|H$N  
  virtual BOOL OnInitDialog(); Y2P%0  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); l#!6 tw+e?  
  afx_msg void OnPaint(); <izn B8@  
  afx_msg HCURSOR OnQueryDragIcon(); oz?pE[[tm  
  virtual void OnCancel(); W< :7z  
  afx_msg void OnAbout(); 4w(#`'I>  
  afx_msg void OnBrowse(); 8Rd*`]@[pk  
  afx_msg void OnChange(); (-hGb:  
 //}}AFX_MSG PG'+vl  
 DECLARE_MESSAGE_MAP() kTS #>uS  
}; \WZ]'o6  
#endif MI|anM  
S2"H E`  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file vUgMfy&  
#include "stdafx.h" yq\p%z$:  
#include "Capture.h" |eFce/  
#include "CaptureDlg.h" 0I"r*;9?K  
#include <windowsx.h> |Fp+9U  
#pragma comment(lib,"hook.lib") 4xzoA'Mb@  
#ifdef _DEBUG &265 B_'D  
#define new DEBUG_NEW N Uo   
#undef THIS_FILE ffoLCx4o0E  
static char THIS_FILE[] = __FILE__; vjO@"2YEw  
#endif 5YnTGf&  
#define IDM_SHELL WM_USER+1 Ce!xa\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^U]B&+m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;wj8:9 ;  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; QX|y};7\e  
class CAboutDlg : public CDialog :6y;U  
{ =.8fES  
 public: u%I |os]  
  CAboutDlg(); y-^m  
  // Dialog Data o@A|Lm.   
  //{{AFX_DATA(CAboutDlg) !5=S 2<UX  
  enum { IDD = IDD_ABOUTBOX }; %g{<EuK]p  
  //}}AFX_DATA gP:H_nVh  
  // ClassWizard generated virtual function overrides y:ad%,. C  
  //{{AFX_VIRTUAL(CAboutDlg) ~SR9*<  
 protected: >m4Q*a4M  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /m(v5v7(  
  //}}AFX_VIRTUAL fFJu]  
  // Implementation %<[U\TL`  
 protected: b*W01ist  
  //{{AFX_MSG(CAboutDlg) )|`|Usn#[  
  //}}AFX_MSG M Qlx&.>  
  DECLARE_MESSAGE_MAP() @;ob 4sU  
}; ])H[>.?K  
XPsRa[08WK  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .|z8WF*  
{ rM{V>s:N  
 //{{AFX_DATA_INIT(CAboutDlg) {<y.G1<.  
 //}}AFX_DATA_INIT GR>kxYM%q  
} Hw 1cc3!  
Rr6}$]1  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) g]E>e v{`  
{ CH+mzy  
 CDialog::DoDataExchange(pDX); GLE"[!s]f  
 //{{AFX_DATA_MAP(CAboutDlg) K *xca(6  
 //}}AFX_DATA_MAP s8iB>-dk  
} U)iq  
s\3OqJo%)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) TIYo&?Z)  
 //{{AFX_MSG_MAP(CAboutDlg) jltW@co2sV  
 // No message handlers Y;[+^J*a  
 //}}AFX_MSG_MAP o2e gNTG  
END_MESSAGE_MAP() b_rHt s  
v2;' F  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) dxK3462  
: CDialog(CCaptureDlg::IDD, pParent) |h* rkLY  
{ b[os0D95  
 //{{AFX_DATA_INIT(CCaptureDlg) R gTrj  
  m_bControl = FALSE; o%sx(g=q6  
  m_bAlt = FALSE; 'jj|bN  
  m_bShift = FALSE; xmNs<mz  
  m_Path = _T("c:\\"); e]q(fPK  
  m_Number = _T("0 picture captured."); 8m"jd+  
  nCount=0; '4]_~?&x  
  bRegistered=FALSE; =dDr:Y<@*  
  bTray=FALSE; r0(*]K:.  
 //}}AFX_DATA_INIT >N8*O3  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \zx$]|AQ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); |cIv&\ x  
} 8c^Hfjr0  
\<0xg[  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) c01i !XS  
{ G7uYkJO  
 CDialog::DoDataExchange(pDX); bTbF  
 //{{AFX_DATA_MAP(CCaptureDlg) {dXmSuO  
  DDX_Control(pDX, IDC_KEY, m_Key); "#G`F  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); -cP7`.a  
  DDX_Check(pDX, IDC_ALT, m_bAlt); crl"Ec  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ^g N/5  
  DDX_Text(pDX, IDC_PATH, m_Path); \k>1q/T0V  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ;\(X;kQi  
 //}}AFX_DATA_MAP .-4]FGg3  
} bd)'1;p  
i$JN s)I%  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) , Aw Z%  
//{{AFX_MSG_MAP(CCaptureDlg) RAB'%CY4  
 ON_WM_SYSCOMMAND() p4^&G/'  
 ON_WM_PAINT() %=`wN^3t2  
 ON_WM_QUERYDRAGICON() z[+Sb;  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) g#b9xTG J^  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) S:8 WBY]M  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +sFpIiJg  
//}}AFX_MSG_MAP =>htX(k}  
END_MESSAGE_MAP()  KGJ *h  
"< })X.t  
BOOL CCaptureDlg::OnInitDialog() X;7hy0Y  
{ CRs@x` 5ue  
 CDialog::OnInitDialog(); l?)!^}Qc  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); NE4 }!I  
 ASSERT(IDM_ABOUTBOX < 0xF000); J^y?nE(j  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Ge1b_?L_  
 if (pSysMenu != NULL) uZe"M(3r$  
 { d3"QCl  
  CString strAboutMenu; [ahK+J  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &M{;[O{  
  if (!strAboutMenu.IsEmpty()) L%;[tu(*  
  { 1\ Gxk&  
   pSysMenu->AppendMenu(MF_SEPARATOR); i !;9A6D  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _"[Ls?tRX  
  } 6KDm#7J  
 } qT~a`ou:  
 SetIcon(m_hIcon, TRUE); // Set big icon \wF- [']N  
 SetIcon(m_hIcon, FALSE); // Set small icon W5,&*mo  
 m_Key.SetCurSel(0); qNi`OVh&  
 RegisterHotkey(); -CLBf'a  
 CMenu* pMenu=GetSystemMenu(FALSE); IxaF *4JG  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); u~7fK  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); E<sd\~~A:  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); JA~q}C7A7o  
 return TRUE; // return TRUE unless you set the focus to a control Y49&EQ  
} N;gY5;0m  
$i@I|y/  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) B *%ey?  
{ 0Ua&_D"  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 2p~}<B  
 { OJiwI)a9  
  CAboutDlg dlgAbout; :!ablO~  
  dlgAbout.DoModal(); WG*),P?  
 } A DVUx}  
 else  ZvwU  
 { *vzEfmN:d  
  CDialog::OnSysCommand(nID, lParam); 3,?LpdTS  
 } IG&twJR  
} uHq;z{ 2GI  
8]D0)  
void CCaptureDlg::OnPaint() foUB/&Ee  
{ /j-c29nz  
 if (IsIconic()) $,zW0</P*l  
 { V1haAP[#  
  CPaintDC dc(this); // device context for painting z(Z7[#.  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 'xLXj>  
  // Center icon in client rectangle RsYMw3)G  
  int cxIcon = GetSystemMetrics(SM_CXICON); S)?N6sz%  
  int cyIcon = GetSystemMetrics(SM_CYICON); E0AbVa.  
  CRect rect; vXm'ARj  
  GetClientRect(&rect); 7=/iFv[  
  int x = (rect.Width() - cxIcon + 1) / 2; /cT6X]o8  
  int y = (rect.Height() - cyIcon + 1) / 2; ZUkM8M$c  
  // Draw the icon C_Z/7x*>d  
  dc.DrawIcon(x, y, m_hIcon); 3 Ak'Ue  
 } d$"?8r4:K  
 else ,^RZ1tLz  
 { ""A6n{4  
  CDialog::OnPaint(); ^a<kp69qS  
 } U\(71 =  
} +NbiUCMX  
i+F*vTM2,  
HCURSOR CCaptureDlg::OnQueryDragIcon() />N#PF  
{ vVP.9(  
 return (HCURSOR) m_hIcon; yi:}UlO  
} l(W?]{C[%  
>qs/o$+t}  
void CCaptureDlg::OnCancel() 1nw\?r2  
{ --EDr>'D5P  
 if(bTray) sY4q$Fq  
  DeleteIcon(); CF 3V)3}  
  CDialog::OnCancel(); zU0SlRFu  
} a?yU;IKJ  
r.lHlHl  
void CCaptureDlg::OnAbout() Wm}gnNwA  
{ \E[6wB>uN%  
 CAboutDlg dlg; Q :.i[  
 dlg.DoModal(); OE}FZCX F  
} xZ6x`BET-  
uq ;yR[w"  
void CCaptureDlg::OnBrowse() \KzH5?  
{ @v#,SF{  
 CString str; jZC[_p;  
 BROWSEINFO bi; mz+UkA'  
 char name[MAX_PATH]; fs?H  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); )ki Gk}2  
 bi.hwndOwner=GetSafeHwnd(); t|mK5aR4  
 bi.pszDisplayName=name; bL Sc=f&  
 bi.lpszTitle="Select folder"; ^/6P~iK'  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; K8Q3~bMf  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); b kc*it  
 if(idl==NULL) Oet+$ b  
  return; Ctn 4q'Q  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); +g kJrw  
 str.ReleaseBuffer(); [uK{``"  
 m_Path=str; M>[ A  
 if(str.GetAt(str.GetLength()-1)!='\\') R7U%v"F>`  
  m_Path+="\\"; W+/_0GgQ3  
 UpdateData(FALSE); _m[DieR  
} o.kDOqd  
}i,r{Y]s]  
void CCaptureDlg::SaveBmp() V[uSo$k+>  
{ nmts% u  
 CDC dc; $dXx@6fP  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); *c [^/  
 CBitmap bm; J8i,[,KcE  
 int Width=GetSystemMetrics(SM_CXSCREEN); ~\8(+qIv%f  
 int Height=GetSystemMetrics(SM_CYSCREEN); i/skU9  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 1. +6x4%rV  
 CDC tdc; =JW-EQ6[T  
 tdc.CreateCompatibleDC(&dc); !><asaB]1  
 CBitmap*pOld=tdc.SelectObject(&bm); ;g? |y(xv  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); [`oVMR  
 tdc.SelectObject(pOld); \PUJD,9H  
 BITMAP btm; vsZ?cd  
 bm.GetBitmap(&btm); \Dy|}LE  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; KyfH8Na?  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); `d$@1  
 BITMAPINFOHEADER bih; (/N&_r4x  
 bih.biBitCount=btm.bmBitsPixel; "I)zi]vk  
 bih.biClrImportant=0; ON){d!]uJ  
 bih.biClrUsed=0; &=BzsBh  
 bih.biCompression=0; DrkTM<  
 bih.biHeight=btm.bmHeight; uBa<5YDF  
 bih.biPlanes=1; 4$[o;t>  
 bih.biSize=sizeof(BITMAPINFOHEADER); n\l?+)S *  
 bih.biSizeImage=size; @$T$hMl  
 bih.biWidth=btm.bmWidth; 8>,w8(Nt  
 bih.biXPelsPerMeter=0; 3>-h- cpMX  
 bih.biYPelsPerMeter=0; ,`Y$}"M4  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); j}eb _K+I  
 static int filecount=0; {V2"Pym?  
 CString name; +q '1P}e  
 name.Format("pict%04d.bmp",filecount++); 5EcVW|(  
 name=m_Path+name; [i /!ovcY  
 BITMAPFILEHEADER bfh; \ agZ D+  
 bfh.bfReserved1=bfh.bfReserved2=0; :86:U 0^  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Rbf6/C  
 bfh.bfSize=54+size; Ze eV-  
 bfh.bfOffBits=54; jRg gj`o  
 CFile bf; 5M~{MdF|.  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @m9pb+=v  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2CO/K_Q  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); $TXxhd 6  
  bf.WriteHuge(lpData,size); :xPo*#[Z(A  
  bf.Close(); fUkqhqe  
  nCount++; <.QaOLD  
 } w W@e#:  
 GlobalFreePtr(lpData); 5]N0p,f  
 if(nCount==1) *9EwZwE_K  
  m_Number.Format("%d picture captured.",nCount); 0%rDDB  
 else II=`=H{  
  m_Number.Format("%d pictures captured.",nCount); P_1WJ  
  UpdateData(FALSE); `Npa/Q  
} qjP~F  
9{jMO  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) (BVqmi{  
{ $72eHdy/yl  
 if(pMsg -> message == WM_KEYDOWN) ?ZlXh51  
 { })/P[^  
  if(pMsg -> wParam == VK_ESCAPE) SH{@yS[c!  
   return TRUE; x z8e1M  
  if(pMsg -> wParam == VK_RETURN) ltNC ti{Q  
   return TRUE; iWf+wC|  
 } G&g;ROgY  
 return CDialog::PreTranslateMessage(pMsg); 0+FPAqX  
} .n]"vpWm[  
j#5a&Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) )/$J$'mcxd  
{ NZvgkci_(u  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ $vegU]-R  
  SaveBmp(); sN[}B{+  
  return FALSE; Ay?<~)H  
} ^Spu/55_  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ F?Lt-a+  
 CMenu pop; 6VGY4j}:(  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); :2? g_  
 CMenu*pMenu=pop.GetSubMenu(0); #KJ# 1  
 pMenu->SetDefaultItem(ID_EXITICON); 'v6@5t19j  
 CPoint pt; UA6id|G  
 GetCursorPos(&pt); o8g7wM]M  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); .dlsiBh  
 if(id==ID_EXITICON) +; KUL6  
  DeleteIcon(); 6dIPgie3w  
 else if(id==ID_EXIT) m^3x%ENZ  
  OnCancel(); Te+(7 Z  
 return FALSE; ka9@7IFM  
} R5uG.Oj-2  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); b w P=f.  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6Rn?pe^  
 AddIcon(); 4E^ ?}_$  
 return res; H0afu)$,  
} YhN<vZ}U!~  
MbRTOH  
void CCaptureDlg::AddIcon() oe*1jR_J`[  
{ t eY@) F  
 NOTIFYICONDATA data; zEI+)|4?r  
 data.cbSize=sizeof(NOTIFYICONDATA); 9&Jf4lC94  
 CString tip; `}Zqmfs  
 tip.LoadString(IDS_ICONTIP); 5qz,FKx5  
 data.hIcon=GetIcon(0); mJUM#ry  
 data.hWnd=GetSafeHwnd(); <1|[=$w  
 strcpy(data.szTip,tip); DhyR  
 data.uCallbackMessage=IDM_SHELL; Z3S+")^  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; >O-KJZ'GV  
 data.uID=98; +8Lbz^#  
 Shell_NotifyIcon(NIM_ADD,&data); GTdoUSUq  
 ShowWindow(SW_HIDE); %biie  
 bTray=TRUE; {=Zy;Er  
} }4|EHhG  
~Gu$E qQ  
void CCaptureDlg::DeleteIcon() Ek{QNlQ]4  
{ 0caZ_-zU  
 NOTIFYICONDATA data; 1rm\u%  
 data.cbSize=sizeof(NOTIFYICONDATA); =tOB fRM  
 data.hWnd=GetSafeHwnd(); FiUQ2w4  
 data.uID=98; f% pT-#  
 Shell_NotifyIcon(NIM_DELETE,&data); *dw.=a9  
 ShowWindow(SW_SHOW); f{P1.?a  
 SetForegroundWindow(); Jl{ 0q7b  
 ShowWindow(SW_SHOWNORMAL); nI*.(+h  
 bTray=FALSE; <fUo@]Lv  
} S^rf^%  
`8!9Fp  
void CCaptureDlg::OnChange() T*x2+(r  
{ |MwV4^  
 RegisterHotkey(); I1<WHq  
} U^dfNi@q  
~|+ ~/  
BOOL CCaptureDlg::RegisterHotkey() #PkuCWm6  
{ E5ce=$o  
 UpdateData(); "-Q+!byh  
 UCHAR mask=0; /lBK )(  
 UCHAR key=0; ~lj[> |\Oj  
 if(m_bControl) E 2n z  
  mask|=4; ?o " Vkc:  
 if(m_bAlt) W"NI^OX  
  mask|=2; K[z)ts-  
 if(m_bShift) *Al@|5  
  mask|=1; >d + }$dB  
  key=Key_Table[m_Key.GetCurSel()]; b$_81i  
 if(bRegistered){ e5' I W__  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); h4;kjr}h}  
  bRegistered=FALSE; jK w 96  
 } G2` z?);1b  
 cMask=mask; ~5KcbGD~  
 cKey=key; `c  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); y!FO  
 return bRegistered; *#=Ijr~  
} nR_Z rm  
:G _  
  四、小结 q'mh*  
EvT$|#FY  
  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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