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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: Uj[E_4h  
  Dqw?3 KB  
  一、实现方法 tM$w0Cj  
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  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: J!GWP:b3  
/.u0rxoRP}  
#pragma data_seg("shareddata")  :nHa-N3  
HHOOK hHook =NULL; //钩子句柄 Dr!g$,9  
UINT nHookCount =0; //挂接的程序数目 J~jR`2+r  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 LZB=vc|3/  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 uzx?U3.\  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey VkNg Vjg  
static int KeyCount =0; L/VlmN_v>s  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 VHlN;6Qlff  
#pragma data_seg() $# /-+>  
7jZ=+2  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 sr&hQ  
|aT&rpt   
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: w)hH8jx{  
n8.W$&-ia  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR kyFq  
cKey,UCHAR cMask) !4(X9}a  
{ M%evk4_27  
 BOOL bAdded=FALSE; %`cP|k  
 for(int index=0;index<MAX_KEY;index++){ )r)3.|wJm  
  if(hCallWnd[index]==0){ _^2rRz  
   hCallWnd[index]=hWnd; #]iSh(|8  
   HotKey[index]=cKey; KL8G2"Z  
   HotKeyMask[index]=cMask; FC:+[.fi  
   bAdded=TRUE; NT^m.o~4  
   KeyCount++; "lFS{7  
   break; !5hNG('f  
  } V5MLzW\8  
 } e-Xr^@M*Q  
 return bAdded; _%xe:X+ M  
} 't+ J7  
//删除热键 (^:0g.~c  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6z6\-45  
{ yl>V '  
 BOOL bRemoved=FALSE; X#bK.WN$  
 for(int index=0;index<MAX_KEY;index++){ [O"9OW'2!B  
  if(hCallWnd[index]==hWnd){ xp!M A  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ aDV~T24  
    hCallWnd[index]=NULL; $S_xrrE#  
    HotKey[index]=0; ig Q,ZY1  
    HotKeyMask[index]=0; $Z{ap  
    bRemoved=TRUE; ^~3u|u  
    KeyCount--; ^ZxT0oaL  
    break; 9vQI ~rz?  
   } ; i)NP X  
  } }#u.Of`6"  
 } K}vP0O}  
 return bRemoved; o =oXL2}  
} !O`aaLc  
+b =X~>vZ  
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  DLL中的钩子函数如下: >1}RiOd3  
3 #8bG(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) v%ldg833l  
{ &V`~ z e  
 BOOL bProcessed=FALSE; nY>UYSv  
 if(HC_ACTION==nCode) |61W-9;  
 { ]^ e4coC  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 XF6ed  
   switch(wParam) $ $=N'Q  
   {  jkVX>*.|oy  
    case VK_MENU: tdCD!rV`{  
     MaskBits&=~ALTBIT; H%peE9>$  
     break; lYF~CNvE  
    case VK_CONTROL: n$*e(  
     MaskBits&=~CTRLBIT; sp-){k  
     break; q':P9 o*N?  
    case VK_SHIFT: r1jsw j%7  
     MaskBits&=~SHIFTBIT; 8]`LRzM  
     break; 6h5,XcO4  
    default: //judge the key and send message m,Fug1+N  
     break; xJ);P.  
   } 3pk=c-x  
   for(int index=0;index<MAX_KEY;index++){ e5GJ:2sH  
    if(hCallWnd[index]==NULL) kKFhbHUZa  
     continue; R7 WGc[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RBA{!  
    { ~+~^c|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); F?!X<N{  
     bProcessed=TRUE; U2DE zr  
    } MYlPG1X=?  
   } ,&q Q[i  
  } ]\.3<^  
  else if((lParam&0xc000ffff)==1){ //有键按下 aANzL  
   switch(wParam) < %t$0'  
   { tLD(%s_  
    case VK_MENU: ju8DmC5  
     MaskBits|=ALTBIT; '",+2=JJ  
     break; VGVb3@  
    case VK_CONTROL: 4#fgUlV  
     MaskBits|=CTRLBIT; p%]ZG,  
     break; V49[XX  
    case VK_SHIFT: 2Sha&Z*CE  
     MaskBits|=SHIFTBIT; S#|dmg;p  
     break; 1M<;}hJ{/  
    default: //judge the key and send message ? kBX:(g  
     break; A4mnm6Tf  
   } +FGw)>g8'm  
   for(int index=0;index<MAX_KEY;index++){ }R\;htmc;  
    if(hCallWnd[index]==NULL) *@-a{T}  
     continue; b;~?a#Z}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .}4^b\   
    { dJf#j?\[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =*\(Y (0  
     bProcessed=TRUE; LV6BSQyQ  
    } RX cfd-us  
   } 9u^yEqG`  
  } iYR`|PJi  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 w dpd`  
   for(int index=0;index<MAX_KEY;index++){ _]"uq/UWp  
    if(hCallWnd[index]==NULL) Mf_urbp]  
     continue; }P(<]UF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }n;.E&<[  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 1m\ihU  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 #BOLq`9 f  
   } kWm[Lt  
  } ig}H7U2q@  
 } yq]/r=e!k  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <%ZlJ_cM  
} 032PR;]  
7c>{og6  
  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: \1[v-hvK  
\O G`+"|L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NB)$l2<d  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); yGZsPQIaV  
h5p,BRtu  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ^sb+|b  
>DkRl  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) K=Y{iHn  
{ 'M=c-{f~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 227 Z6#CF!  
 { G W~ZmK  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 } :9UI  
  SaveBmp(); VcpN PU6  
  return FALSE; 2y` :#e`x1  
 } -xMM}r y  
 …… //其它处理及默认处理 2 i:tPe&  
} M7. fz"M  
dePI&z:  
p5?8E$VHV  
  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。 { cMf_qQ  
~9h/{$  
  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。 z>9gt  
P%_PG%O2p  
  二、编程步骤 OJTEvb6nPg  
,?(IRiq%  
  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"; V(6GM+  
rwCjNky!  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; >#8J@=iuqv  
5l,Q=V^@l  
  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; YdiXj |k+  
+x:-W0C:  
  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;  OYwH$5  
"u.4@^+i  
  5、 添加代码,编译运行程序。 t}A n:  
lgei<\6~n5  
三、程序代码 RQt\_x7P  
," ~4l&  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL /Q*cyLv  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ;VI W/  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ u[yUUYe  
#if _MSC_VER > 1000 w$)E#|i  
#pragma once }Pf7YuUZZ  
#endif // _MSC_VER > 1000 97~*Z|#<+  
#ifndef __AFXWIN_H__ 9_5tA'Q  
#error include 'stdafx.h' before including this file for PCH 3|g]2|~w@h  
#endif +'fdAc:5',  
#include "resource.h" // main symbols "H!2{l{  
class CHookApp : public CWinApp 3t^r;b  
{ n]]!:jFC  
 public: I~: AWS9  
  CHookApp(); +5C*i@v  
  // Overrides i[x;k;m2q  
  // ClassWizard generated virtual function overrides H;nq4;^yK  
  //{{AFX_VIRTUAL(CHookApp) qGgqAF#B  
 public: <+2M,fq+  
  virtual BOOL InitInstance(); J;S@Q/s  
  virtual int ExitInstance(); _O*"_^6  
  //}}AFX_VIRTUAL c7$U0JO  
  //{{AFX_MSG(CHookApp) //\UthOT  
  // NOTE - the ClassWizard will add and remove member functions here. <u9U%V si  
  // DO NOT EDIT what you see in these blocks of generated code ! #H1ng<QV  
  //}}AFX_MSG (HZzA7eph  
  DECLARE_MESSAGE_MAP() T-L; iH~0  
}; /92m5p  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ZZXQCP6]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); u  teI[Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q<F-l. q   
BOOL InitHotkey(); jSyF]$"  
BOOL UnInit(); -{A!zTw1w  
#endif nS}XY  
7k>sE  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Vgh_F8G!V  
#include "stdafx.h" M6+_Mi.  
#include "hook.h" @I '_  
#include <windowsx.h> XdDy0e4{%<  
#ifdef _DEBUG #y2="$ V  
#define new DEBUG_NEW 'J+Vw9 s7  
#undef THIS_FILE 0Ac]&N d`  
static char THIS_FILE[] = __FILE__; @ttcFX1:W  
#endif >:h 8T]F  
#define MAX_KEY 100 :^! wQ""  
#define CTRLBIT 0x04 t$rWE|+_z  
#define ALTBIT 0x02 xlS t  
#define SHIFTBIT 0x01  X1y1  
#pragma data_seg("shareddata") 1rT}mm/e;  
HHOOK hHook =NULL; (F~eknJ  
UINT nHookCount =0; 1%EIP -z  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey lOcvRF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ^]AjcctGr  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Ku56TH!Py  
static int KeyCount =0; js'* :*7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift !9OAMHa*9  
#pragma data_seg() FpCj$y~3  
HINSTANCE hins; X-6Se  
void VerifyWindow(); h`?0=:Tru  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) [m!$01=  
//{{AFX_MSG_MAP(CHookApp) 2u/(Q>#  
// NOTE - the ClassWizard will add and remove mapping macros here. x>p=1(L  
// DO NOT EDIT what you see in these blocks of generated code! HFvhrG  
//}}AFX_MSG_MAP @U:WWTzf  
END_MESSAGE_MAP() hjaI&?w  
pA"pt~6  
CHookApp::CHookApp() jpT!di  
{ sm4@ywd>  
 // TODO: add construction code here, }a-ikFQ]  
 // Place all significant initialization in InitInstance 5{[3I|m{  
} :KMo'pL  
E+UOuf*(  
CHookApp theApp; \d]&}`'4{f  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;m@>v?zE  
{ ^ 4c2}>f  
 BOOL bProcessed=FALSE; Nbuaw[[iz  
 if(HC_ACTION==nCode) UFC.!t-Z  
 { y/4 4((O  
  if((lParam&0xc0000000)==0xc0000000){// Key up W;OxH"eC  
   switch(wParam) Ed.~9*m  
   { Et# }XVCJ  
    case VK_MENU: pcoJ\&&W  
     MaskBits&=~ALTBIT; a}El!7RO0  
     break; m -7^$  
    case VK_CONTROL: X}h{xl   
     MaskBits&=~CTRLBIT;  @X  
     break; NJLU +b yU  
    case VK_SHIFT: daY^{u3  
     MaskBits&=~SHIFTBIT; ]'DtuT?Z  
     break; t.485L %  
    default: //judge the key and send message ?gH[tN:=  
     break; b> &kL  
   } U_Emp[  
   for(int index=0;index<MAX_KEY;index++){ :q0C$xF  
    if(hCallWnd[index]==NULL) *.n9D  
     continue; #oJ9BgDry  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Kc}FMu  
    { J:5%ff~r\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~KHp~Xs`  
     bProcessed=TRUE; ~Se/uL;*  
    } xAon:58m{  
   } ]ZHC*r2i  
  } SI8mr`gJ  
  else if((lParam&0xc000ffff)==1){ //Key down H:a(&Zb  
   switch(wParam) /'!F \ kz  
   { 9Z6O{ >  
    case VK_MENU: GriL< =?t  
     MaskBits|=ALTBIT; (B7M*e  
     break; fW <qp  
    case VK_CONTROL: .lOEQLt  
     MaskBits|=CTRLBIT; 6 @'v6 1'  
     break; !NZFo S~  
    case VK_SHIFT: V: 2|l!l*  
     MaskBits|=SHIFTBIT; L+9a4/q  
     break; *-Z JF6  
    default: //judge the key and send message pV:X_M6  
     break; h8 $lDFo  
   } zT0FTAl ^  
   for(int index=0;index<MAX_KEY;index++) \;$j "i&  
   { oypX.nye_  
    if(hCallWnd[index]==NULL) ]geO%m  
     continue; . p<*n6E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !E4YUEY 6  
    { ` ~VV1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); u=p([ 5]  
     bProcessed=TRUE; *=UEx0_!q  
    }  G\ru%  
   } +p>tO\mo  
  } QEm6#y  
  if(!bProcessed){ wRi!eN?  
   for(int index=0;index<MAX_KEY;index++){ bt-y6,> +E  
    if(hCallWnd[index]==NULL) ~eA7:dZLb  
     continue; zxT&K|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) jaFBz&P/#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "b|qyT* Sl  
   } j^Bo0{{  
  } 5O]ph[7  
 } 3K_J"B*7  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); R*'rg-d  
} |z-A;uL<  
<;=?~QK%-  
BOOL InitHotkey() Jx.Jx~  
{ FI Io{ru  
 if(hHook!=NULL){ L:}hZf{p*  
  nHookCount++; /MosE,7l  
  return TRUE; ?qO_t;:0>  
 } .Q>.|mu  
 else "6FZX~]s!  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ovvR{MTc  
  if(hHook!=NULL) W{*U#:Jx1  
   nHookCount++; j[F\f>  
  return (hHook!=NULL); \h!%U*!7{  
} K_G( J>  
BOOL UnInit() #||^l_  
{ B#OnooJI  
 if(nHookCount>1){ ;1'X_tp  
  nHookCount--; `gDpb.=Y  
  return TRUE; C-V,3}=*2  
 } p$`71w)'[  
 BOOL unhooked = UnhookWindowsHookEx(hHook); nxS|]  
 if(unhooked==TRUE){ 3-`IMN n!  
  nHookCount=0; W_Z%CBjcT  
  hHook=NULL; W.'#pd  
 } zn@<>o8hU  
 return unhooked; sn+g#v9e  
} !D!~4h)  
|A0BYzlVc  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V|13%aE_v  
{ =8?y$WE  
 BOOL bAdded=FALSE; !ow:P8K?  
 for(int index=0;index<MAX_KEY;index++){ ZX'q-JUv f  
  if(hCallWnd[index]==0){ ? %XTD39  
   hCallWnd[index]=hWnd; W8z4<o[$  
   HotKey[index]=cKey; >E;kM B  
   HotKeyMask[index]=cMask; <2"'R(4",  
   bAdded=TRUE; MKf|(6;~  
   KeyCount++;  sC1Mwx  
   break; %UT5KYd!=N  
  } ]V0V8fU|  
 } Kkcb' aDR  
 return bAdded; `<2k.aW4e8  
} d,8L-pT$FM  
)S@e&a|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >'ev_eAk  
{ iO 9.SF0:  
 BOOL bRemoved=FALSE; cvxYuP~  
 for(int index=0;index<MAX_KEY;index++){ b+Sq[  
  if(hCallWnd[index]==hWnd){ q!iTDg*$  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 55q!2>Jh.  
    hCallWnd[index]=NULL; MdXOH$ ps  
    HotKey[index]=0; =1sGT;>  
    HotKeyMask[index]=0; .8e]-^Z  
    bRemoved=TRUE; P1C{G'cR  
    KeyCount--; -LzkM"  
    break; \]<e Lw- v  
   } 7.)kG}q]  
  } 4PK/8^@7)>  
 } !iv6k~.e'2  
 return bRemoved; 6$/Z.8  
} 3 @ahN2  
[x{z}rYH  
void VerifyWindow() =r|e]4  
{ q8A;%.ZLG  
 for(int i=0;i<MAX_KEY;i++){ c"KN;9c,  
  if(hCallWnd!=NULL){ !]f80z  
   if(!IsWindow(hCallWnd)){ Ey|{yUmU+  
    hCallWnd=NULL; d ~#B,+  
    HotKey=0; E? lK(C  
    HotKeyMask=0; )j,Y(V$P  
    KeyCount--; T*o!#E.  
   } gGZ-B<  
  } ;k ?Z,M:  
 } {%wF*?gk  
} @ TJx U  
nA*U drcn  
BOOL CHookApp::InitInstance() A1Ru&fd!  
{ M$u.lI  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); izDfpr}s4  
 hins=AfxGetInstanceHandle(); *kY JwO^  
 InitHotkey(); 8k{KnH  
 return CWinApp::InitInstance(); ZLDO&}  
} c,CcKy;+  
:o3>  
int CHookApp::ExitInstance() 1.0:  
{ !;3hN$5  
 VerifyWindow(); <-6f}wN  
 UnInit(); CdZ. T/x  
 return CWinApp::ExitInstance(); 0tKVo]EK  
} FEH+ PKSc  
_V`F_C\\#  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file aT4I sPA?_  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 9dVHh?E  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ o9rZ&Q<  
#if _MSC_VER > 1000 %W}YtDf\  
#pragma once &=*sN`  
#endif // _MSC_VER > 1000 q2 b>Z6!5  
,ZI#p6  
class CCaptureDlg : public CDialog 15z(hzU?#  
{ |&"/u7^  
 // Construction 1%$t;R  
 public: CJjT-(a  
  BOOL bTray; 2BKiA[ ;;  
  BOOL bRegistered; .[r1Qz7G  
  BOOL RegisterHotkey(); ::p%R@?  
  UCHAR cKey; 7@R^B=pb  
  UCHAR cMask; ?[]jJ  
  void DeleteIcon(); -x{@D{Q%  
  void AddIcon(); >*/:"!u  
  UINT nCount; %I=/ y  
  void SaveBmp(); NQxx_3*4O  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor \kZ@2.pN  
  // Dialog Data ( Sjlm^bca  
  //{{AFX_DATA(CCaptureDlg) "8p<NsU   
  enum { IDD = IDD_CAPTURE_DIALOG }; U3jnH  
  CComboBox m_Key; ]eUD3WUe>q  
  BOOL m_bControl; ?bH`  
  BOOL m_bAlt; mBxMDnh  
  BOOL m_bShift; b0sj0w/  
  CString m_Path; [b+B"f6  
  CString m_Number; [!C!R$AMa  
  //}}AFX_DATA ~Ede5Vg!!2  
  // ClassWizard generated virtual function overrides I<Cm$8O?  
  //{{AFX_VIRTUAL(CCaptureDlg) ? o&goiM  
 public: DS+BX`i%#p  
  virtual BOOL PreTranslateMessage(MSG* pMsg); n/Dg)n?  
 protected: 194n   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Py?e+[cN  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `,O"^zR)z  
  //}}AFX_VIRTUAL 'C=(?H)M  
  // Implementation iSX HMp4V  
 protected: F~0iJnF  
  HICON m_hIcon; SQ*%d.1  
  // Generated message map functions *k Tj,&x[  
  //{{AFX_MSG(CCaptureDlg) ly69:TR7I  
  virtual BOOL OnInitDialog(); S}VN(g  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam);  f,kV  
  afx_msg void OnPaint(); x:i,l:x  
  afx_msg HCURSOR OnQueryDragIcon(); P1z:L  
  virtual void OnCancel(); r:PYAb=g  
  afx_msg void OnAbout(); \PD%=~  
  afx_msg void OnBrowse();  #]QS   
  afx_msg void OnChange(); m7`S@qG  
 //}}AFX_MSG ecx_&J@D  
 DECLARE_MESSAGE_MAP() h@]{j_$u  
}; S(Z\h_m(  
#endif o^/ fr&,9  
03A QB;.  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file  k{'<J(Hb  
#include "stdafx.h" I]HLWF  
#include "Capture.h" @NiLKcL#  
#include "CaptureDlg.h" G0kF[8Am  
#include <windowsx.h> m^zD']  
#pragma comment(lib,"hook.lib") -]-0]*oAp  
#ifdef _DEBUG @=}NMoNH  
#define new DEBUG_NEW  )y6  
#undef THIS_FILE 1;?w#/&t  
static char THIS_FILE[] = __FILE__; I FvigDj?  
#endif c6 .j$6t  
#define IDM_SHELL WM_USER+1 ?9 W2ax-4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `gF ]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &xvNR=K[`  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; YzJWS|]  
class CAboutDlg : public CDialog Bio QV47B  
{ I. Xbowl  
 public: t|9vb  
  CAboutDlg(); CKSs(-hkJ  
  // Dialog Data ,-kz \N@.  
  //{{AFX_DATA(CAboutDlg) dQFUQ  
  enum { IDD = IDD_ABOUTBOX }; S;/pm$?/  
  //}}AFX_DATA VZe'6?#  
  // ClassWizard generated virtual function overrides Z%b1B<u$  
  //{{AFX_VIRTUAL(CAboutDlg) oLtzPC  
 protected: _,v>P2)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \ [M4[Qlq  
  //}}AFX_VIRTUAL AFeFH.G6Jr  
  // Implementation >L8 & 6aU  
 protected: T!pA$eE  
  //{{AFX_MSG(CAboutDlg) /1m+iM^V  
  //}}AFX_MSG >) Bv>HM  
  DECLARE_MESSAGE_MAP() . Y$xNLoP[  
}; BlM(Q/z  
L^PBcfg  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #Uep|A  
{ 7Bd=K=3u  
 //{{AFX_DATA_INIT(CAboutDlg) E$A=*-u  
 //}}AFX_DATA_INIT IL uQf-  
} &os:h] C  
_;/+8=  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _PQk<QZ  
{ Au{b1n  
 CDialog::DoDataExchange(pDX); }[PC YnS  
 //{{AFX_DATA_MAP(CAboutDlg) \IEuu^  
 //}}AFX_DATA_MAP (dx~lMI  
} K|Xe)  
$Y\7E/T  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) #;+SAoN  
 //{{AFX_MSG_MAP(CAboutDlg) Q. '2 v%i  
 // No message handlers TTWiwPo59  
 //}}AFX_MSG_MAP )c 79&S  
END_MESSAGE_MAP() ;?TM_%>  
;!7M<T$&  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) T.B7QAI. H  
: CDialog(CCaptureDlg::IDD, pParent) 5^CWF|  
{ (yeWArQ  
 //{{AFX_DATA_INIT(CCaptureDlg) 7osHKO<?2  
  m_bControl = FALSE; - (q7"h  
  m_bAlt = FALSE; 7j(gW  
  m_bShift = FALSE; ux 17q>G  
  m_Path = _T("c:\\"); '$ z@40u  
  m_Number = _T("0 picture captured."); FBOgaI83G  
  nCount=0; W'Y(@  
  bRegistered=FALSE; pX$ X8z%  
  bTray=FALSE; eOfVBF<C2  
 //}}AFX_DATA_INIT L. S/Mv  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 )(c%QWz  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); IJ:JH=8  
} cFq2 6(e  
.ezZ+@LI+#  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 10GU2a$0"$  
{ v0bP|h[t  
 CDialog::DoDataExchange(pDX); Id>I.e4  
 //{{AFX_DATA_MAP(CCaptureDlg) dl`{:ZR S  
  DDX_Control(pDX, IDC_KEY, m_Key); 7&w[h4Lw  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 2r]o>X  
  DDX_Check(pDX, IDC_ALT, m_bAlt); [L ' >  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); *_HF%JYMZ  
  DDX_Text(pDX, IDC_PATH, m_Path); M!%|IKw  
  DDX_Text(pDX, IDC_NUMBER, m_Number); %ZDO0P !/  
 //}}AFX_DATA_MAP 8.7lc2aX  
} k @gQY_  
EN8xn9M?  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ?V(+Cc  
//{{AFX_MSG_MAP(CCaptureDlg) Qv]rj]%  
 ON_WM_SYSCOMMAND() 1F+JyZK}w  
 ON_WM_PAINT() 3BF3$_u)o  
 ON_WM_QUERYDRAGICON() [F{P0({%?  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) kP^=  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) hrXk7}9  
 ON_BN_CLICKED(ID_CHANGE, OnChange) gr# |ZK.`  
//}}AFX_MSG_MAP .*J /F$  
END_MESSAGE_MAP() \6aisK  
"3_GFq  
BOOL CCaptureDlg::OnInitDialog() M~+DxnJ=  
{ !!cN4X  
 CDialog::OnInitDialog(); #3A|Z=,5  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); +c__U Qx  
 ASSERT(IDM_ABOUTBOX < 0xF000); 2lqy<o  
 CMenu* pSysMenu = GetSystemMenu(FALSE); A8:eA  
 if (pSysMenu != NULL) QiJ  
 { 2h)Qz+|7  
  CString strAboutMenu; 'q@vTM'-  
  strAboutMenu.LoadString(IDS_ABOUTBOX); FJT0lC  
  if (!strAboutMenu.IsEmpty()) )l`VE_(|  
  { Ry?f; s  
   pSysMenu->AppendMenu(MF_SEPARATOR); _sY; dS/  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); *>xCX  
  } ^uPg71r:  
 } Q8.LlE999  
 SetIcon(m_hIcon, TRUE); // Set big icon e{ *yV#Wl  
 SetIcon(m_hIcon, FALSE); // Set small icon ofPv?_@  
 m_Key.SetCurSel(0); }02(Y!Gh  
 RegisterHotkey(); Wv ~&Qh}  
 CMenu* pMenu=GetSystemMenu(FALSE); n9R0f9:*  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); z*9 ke  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); m1xR uj]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5 Yww,s  
 return TRUE; // return TRUE unless you set the focus to a control 8Dn~U :F/?  
} 91nw1c!  
D_`NCnYG  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Iyb_5 UmpF  
{ 1xSG(!  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ff~1>=^  
 { Pw5[X5.DX  
  CAboutDlg dlgAbout; Z#YNL-x  
  dlgAbout.DoModal(); tg\o"QKW9  
 } q>5j (,6F  
 else b`F]oQ_*  
 { \xQu*M:!  
  CDialog::OnSysCommand(nID, lParam); z\woTL6D]  
 } Ys&)5j-  
} 9Hd_sNUu\  
yqB!0) <  
void CCaptureDlg::OnPaint() ydAiH*>  
{ 2( m#WK7>F  
 if (IsIconic()) 8;# yXlf  
 { l,zhBnD  
  CPaintDC dc(this); // device context for painting 8)ng> l  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); o^m?w0 \  
  // Center icon in client rectangle uL^`uI#I  
  int cxIcon = GetSystemMetrics(SM_CXICON); @PctBS<s  
  int cyIcon = GetSystemMetrics(SM_CYICON); d`~~Ww1  
  CRect rect; Iga#,k+%  
  GetClientRect(&rect); nd7g8P9p  
  int x = (rect.Width() - cxIcon + 1) / 2; `*D"=5G+  
  int y = (rect.Height() - cyIcon + 1) / 2; l@ (:Q!Sk  
  // Draw the icon +w"?q'SnF  
  dc.DrawIcon(x, y, m_hIcon); `*U$pg  
 } / :6|)AW.{  
 else K/m3  
 { rWys'uc  
  CDialog::OnPaint(); EcIE~qs  
 } dpQG[vXe  
} ?oZR.D|SZ  
HS'Vi9  
HCURSOR CCaptureDlg::OnQueryDragIcon() 1}hIW":3Sr  
{ o:Qv JcB  
 return (HCURSOR) m_hIcon; kdz=ltw  
} 9[!,c`pw  
}(a+aHH  
void CCaptureDlg::OnCancel() $VAx:Y|  
{ G;> _<22  
 if(bTray) Nu8Sr]p  
  DeleteIcon(); 2._X|~0a  
  CDialog::OnCancel(); VxP&j0M>  
} wB'zuPAK6  
8x`.26p  
void CCaptureDlg::OnAbout() %h1N3\y9i(  
{ I%|>2}-_U  
 CAboutDlg dlg; dd2[yKC`  
 dlg.DoModal(); (E,T#uc{  
} zf3v5Hk  
2Q;9G6p  
void CCaptureDlg::OnBrowse() 'B+ ' (f  
{ rt JtK6t  
 CString str; nRd)++  
 BROWSEINFO bi; </uO e.l>Q  
 char name[MAX_PATH]; B^).BQ  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); CJ}5T]WZ  
 bi.hwndOwner=GetSafeHwnd(); keRE==(D  
 bi.pszDisplayName=name; }kg ye2[  
 bi.lpszTitle="Select folder"; VDTcR  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; XMG]Wf^%\<  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); d1[ZHio2c?  
 if(idl==NULL) hsu{eyp  
  return; s3Cc;#  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Dk48@`l2  
 str.ReleaseBuffer(); 8p[)MiC5W^  
 m_Path=str; ){jl a,[  
 if(str.GetAt(str.GetLength()-1)!='\\') x@8a''  
  m_Path+="\\"; NnVnUgx  
 UpdateData(FALSE); fNGZo  
} E 7-@&=]v  
g^zs,4pPU<  
void CCaptureDlg::SaveBmp() G:g69=x y  
{ @k&qb!Qah  
 CDC dc; A 7[:5$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); .F+@B\A<  
 CBitmap bm; uw lr9nB  
 int Width=GetSystemMetrics(SM_CXSCREEN); X$/2[o#g  
 int Height=GetSystemMetrics(SM_CYSCREEN); YJ$1N!rG  
 bm.CreateCompatibleBitmap(&dc,Width,Height); e}1uz3Rh  
 CDC tdc; ws4cF N9P?  
 tdc.CreateCompatibleDC(&dc); ]l8^KX'  
 CBitmap*pOld=tdc.SelectObject(&bm); |JCU<_<  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); k{t`|BnPKB  
 tdc.SelectObject(pOld); Z0l+1iMx  
 BITMAP btm; w&ak"GgV  
 bm.GetBitmap(&btm); Y3Q9=u*5  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; sH\5/'?  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); `-LGU7~+  
 BITMAPINFOHEADER bih; )=Jk@yj8x  
 bih.biBitCount=btm.bmBitsPixel; 6-O_\Cq8  
 bih.biClrImportant=0; 5h;+Ky!I  
 bih.biClrUsed=0; mc4i@<_?  
 bih.biCompression=0; rx}r~0i  
 bih.biHeight=btm.bmHeight; m8.U &0  
 bih.biPlanes=1; ;| 1$Q!4  
 bih.biSize=sizeof(BITMAPINFOHEADER); y|wc ,n%L>  
 bih.biSizeImage=size; Sfdu`MQR  
 bih.biWidth=btm.bmWidth; kBN+4Dr/$  
 bih.biXPelsPerMeter=0; :,)lm.}]t  
 bih.biYPelsPerMeter=0; H= X|h)  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1@$Ko5  
 static int filecount=0; )m. 4i=X  
 CString name; qgrg CJ  
 name.Format("pict%04d.bmp",filecount++); m4*@o?Ow  
 name=m_Path+name; MHa#?Q9  
 BITMAPFILEHEADER bfh; 3 h<,  
 bfh.bfReserved1=bfh.bfReserved2=0; mx=BD'  
 bfh.bfType=((WORD)('M'<< 8)|'B'); tor!Dl@Mo  
 bfh.bfSize=54+size; ,cq F3   
 bfh.bfOffBits=54; xMBaVlEN  
 CFile bf; TiH) 5  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ~zw]5|  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); GAAm0;  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); nl9P, d  
  bf.WriteHuge(lpData,size); 5scEc,JCi  
  bf.Close(); t]e;;q=L.  
  nCount++; 9H%X2#:fH  
 } Gw1@KKg  
 GlobalFreePtr(lpData); #BST lz  
 if(nCount==1) 7hcNf,  
  m_Number.Format("%d picture captured.",nCount); gmm.{%1_I;  
 else iJ~Vl"|m  
  m_Number.Format("%d pictures captured.",nCount); FJd]D[h  
  UpdateData(FALSE); ZIF49`Y4TF  
} n..g~ $k  
 Sr?#S  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Y5j]Z^^v  
{ *<!oHEwkN  
 if(pMsg -> message == WM_KEYDOWN) )Dz+X9;g+  
 { )Qvk*9OS  
  if(pMsg -> wParam == VK_ESCAPE) x]33LQ1]  
   return TRUE; \!ej<T+JR>  
  if(pMsg -> wParam == VK_RETURN) Rx+p.  
   return TRUE; ]EpWSs!"g  
 } /g4f`$a  
 return CDialog::PreTranslateMessage(pMsg); =ha{Ziryo  
} b2FO$Os  
o-Ga3i 8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "V}[':fen  
{ 2J;kSh1,L  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ G2FXrkU  
  SaveBmp(); Nj 00W1  
  return FALSE; +="e]Yh;  
} jfqopiSi  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @qHNE,K  
 CMenu pop; "T- `$'9  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #KiRfx4G  
 CMenu*pMenu=pop.GetSubMenu(0); E^ SH\5B  
 pMenu->SetDefaultItem(ID_EXITICON); 'Un " rts  
 CPoint pt; x>Jr_A(  
 GetCursorPos(&pt); ]S5JUAGkE*  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); AoI/n4T^  
 if(id==ID_EXITICON) )d>!"JB-  
  DeleteIcon(); aVd,xl  
 else if(id==ID_EXIT) z'EajBB\f  
  OnCancel(); "^]cQ"A  
 return FALSE; TU 1I} ,  
} (/j); oSK  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); o+$7'+y1n-  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) b 'pOJS  
 AddIcon(); ,c)uX#1  
 return res; QD>"]ap,o  
} SE~[bT  
' >rw(3  
void CCaptureDlg::AddIcon() 9,r rQQD_  
{ xcf%KXJf6  
 NOTIFYICONDATA data; |UxG$M(  
 data.cbSize=sizeof(NOTIFYICONDATA); mFZ?hOyP.  
 CString tip; L~NbdaO  
 tip.LoadString(IDS_ICONTIP); n= u&uqA*  
 data.hIcon=GetIcon(0); AlIpsJ[UU  
 data.hWnd=GetSafeHwnd();  MEGv}  
 strcpy(data.szTip,tip); UTH_^HAN#G  
 data.uCallbackMessage=IDM_SHELL; n0e1k.A  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;  W0]gLw9*  
 data.uID=98; dp*u9z~NA  
 Shell_NotifyIcon(NIM_ADD,&data); 9BuSN*4  
 ShowWindow(SW_HIDE); /x1![$oC0  
 bTray=TRUE; u[ Yk  
} =^5Alb a/  
m-*hygkcDu  
void CCaptureDlg::DeleteIcon() eXf22;Lz  
{ iB& 4>+N+  
 NOTIFYICONDATA data; wLOB}ZMT  
 data.cbSize=sizeof(NOTIFYICONDATA); H,u<|UMM_  
 data.hWnd=GetSafeHwnd(); Rw:*'1  
 data.uID=98; G8Y<1%`<  
 Shell_NotifyIcon(NIM_DELETE,&data); LpqO{#ZG  
 ShowWindow(SW_SHOW); SF<c0bR9  
 SetForegroundWindow(); _c_[ C*T]  
 ShowWindow(SW_SHOWNORMAL); 9uA>N  
 bTray=FALSE; cj'}4(  
} #odIEC/  
7*Ej. HK  
void CCaptureDlg::OnChange() "pRtczxOgR  
{ YS*9t Q{  
 RegisterHotkey(); Nqa&_5"  
} l.NEkAYPmH  
4k@5/5zsM  
BOOL CCaptureDlg::RegisterHotkey() 'GS"8w~j  
{ ?}U(3  
 UpdateData(); ub\MlSr  
 UCHAR mask=0; <yNM%P<Oy  
 UCHAR key=0; |~vI3]}fx  
 if(m_bControl) YLzx<~E4a  
  mask|=4; l)&X$3?tz  
 if(m_bAlt) jGpN,/VQa  
  mask|=2; +N:o-9  
 if(m_bShift) 9#MBaO8_"  
  mask|=1; ne_TIwfw-  
  key=Key_Table[m_Key.GetCurSel()]; n4R(.N00  
 if(bRegistered){ O%5 r[  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); .xm.DRk3  
  bRegistered=FALSE; .@@?Pj?)  
 } !FElW`F  
 cMask=mask; AN/;)wc  
 cKey=key; = 's(|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #x 177I\  
 return bRegistered; |6K+E6H  
} O\"3J(y,  
:?g:~+hfO  
  四、小结 G <i@ 5\#  
rPLm5ni  
  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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