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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: )'6DNa[y  
  fvdU`*|n)  
  一、实现方法 {l/-LZ.  
.ZJRO>S  
  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: f]\CD<g3|E  
2C9V|[U,  
#pragma data_seg("shareddata") &GB:|I'%7  
HHOOK hHook =NULL; //钩子句柄 WRrd'{sB  
UINT nHookCount =0; //挂接的程序数目 vJ-q*qM1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ~;#Y9>7\\'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 >o7n+Rb:  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey !3*(N8_|#  
static int KeyCount =0; [&#/]Ul'  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 3< 2}V  
#pragma data_seg() aD=A^ktx  
n8".XS  
  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。 >VN5`Zlw\C  
'>' wK.  
  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: '<ZlGFt'n  
'gPzm|f|t@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR k6sI L3QJ0  
cKey,UCHAR cMask) }Du}c3  
{ 'i4_`^:+  
 BOOL bAdded=FALSE; ).sRv6/c  
 for(int index=0;index<MAX_KEY;index++){ a{qM2P(S  
  if(hCallWnd[index]==0){ =A!@6Nw  
   hCallWnd[index]=hWnd; .`4{9?bR  
   HotKey[index]=cKey; :"xzj<(  
   HotKeyMask[index]=cMask; bqnNLs<N  
   bAdded=TRUE; "hzB9*"t  
   KeyCount++; /#VhkC _  
   break; /p+>NZ"b  
  } ~1W x =  
 } }}>q2y  
 return bAdded; ,u`YT%&L  
} ,z-}t& _t  
//删除热键 q(2K6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ai gS!-   
{ S/ODq L|  
 BOOL bRemoved=FALSE; I~Zh@d%  
 for(int index=0;index<MAX_KEY;index++){ w6{TE(]zp  
  if(hCallWnd[index]==hWnd){ P#XID 2;  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ O]1y0BOQ  
    hCallWnd[index]=NULL; *Of4o  
    HotKey[index]=0; vfE6Ggz  
    HotKeyMask[index]=0; ysQ,)QoiR{  
    bRemoved=TRUE; SVB\  
    KeyCount--; ~,5gUl?Il  
    break; R)RG[F#   
   } }5}.lJ:  
  } 7,lq}a8z  
 } .[3Z1v,  
 return bRemoved; #7 q7PYG4  
} 2gq9k}38  
j+["JXy  
@++.FEf  
  DLL中的钩子函数如下: 1M 781  
iTAx=SG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) sSi6wO$  
{ 2VE9}%i  
 BOOL bProcessed=FALSE; G %Q^o5m  
 if(HC_ACTION==nCode) ~nG(5:A5g/  
 { S>]pRV9rT  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 t_qNq{  
   switch(wParam)  .5y+fL  
   {  1r]Io gI  
    case VK_MENU: gm[z[~X@  
     MaskBits&=~ALTBIT; {yB&xj[z  
     break; Y[K*57fs  
    case VK_CONTROL: 8=Z9T<K  
     MaskBits&=~CTRLBIT; "vyNxZE  
     break; +L9Eqll  
    case VK_SHIFT: jg\Z;_!W  
     MaskBits&=~SHIFTBIT; ZfgJ.<<  
     break; N,;5{y1;J  
    default: //judge the key and send message <F=xtyl7  
     break; _J? Dq  
   } lo,$-bJ,<,  
   for(int index=0;index<MAX_KEY;index++){ h_T7% #0  
    if(hCallWnd[index]==NULL) %]8qAtV^3j  
     continue; NwG= <U*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,H19`;Q  
    { G6FEp`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3 YFU*f,  
     bProcessed=TRUE; XAe% m^  
    } kZerKP  
   } w$`5g  
  } e^[H[d.WMC  
  else if((lParam&0xc000ffff)==1){ //有键按下 1PP $XJtyD  
   switch(wParam) ~ ArP9 K "  
   { cQ" ~\  
    case VK_MENU: }C>{uXv  
     MaskBits|=ALTBIT; _oUHJ~&,  
     break; 82QGS$0V  
    case VK_CONTROL: /(BMG/Tb  
     MaskBits|=CTRLBIT; q~vDz]\G  
     break; Lg*B>=  
    case VK_SHIFT: CS=qj-(  
     MaskBits|=SHIFTBIT; (;57Vw  
     break; *]VFvh  
    default: //judge the key and send message vOc 9ZE  
     break; *?Kr*]dnLl  
   } ;F~LqC$  
   for(int index=0;index<MAX_KEY;index++){ K/3)g9Z&io  
    if(hCallWnd[index]==NULL) 3T}izG]  
     continue; ],J EBt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N 0= ac5  
    { ?hWwj6i&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9=V:&.L  
     bProcessed=TRUE; NZ-\h  
    } p-zXp K"  
   } [vHv0"   
  } v(-{=*':  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 J~1r{5V4{  
   for(int index=0;index<MAX_KEY;index++){ =UJ:tSr  
    if(hCallWnd[index]==NULL) n>^Y$yy}!  
     continue; PV4(hj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 3+G@g#MY  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $} =krz:r  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 (s7;^)}zx  
   } lobGj8uxq  
  } 75T7+:p  
 } B,@c; K  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6u`)QUmItg  
} C~N/A73gF  
0VGPEKRh  
  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: L_+k12lm  
!>e5z|1   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }c`fW&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _;~,Cgfi  
>9(hUH  
  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: ~D5\O6mU-  
OQ>x5?um  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) o(r\E0 I  
{ R&Jm +3N  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) $n+w$CI)  
 { ;ml)l~~YU  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ;r>snJ=M  
  SaveBmp(); Pp`*]Ib  
  return FALSE; bVL9vNK  
 } sZL#xZ5 Df  
 …… //其它处理及默认处理 fD07VBS yl  
} bX*Hi#J~A  
b r^_'1  
'eJ+JM<0%  
  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。 b D[!/'4eJ  
o_D?t-XH  
  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。 -R%<.]fJ  
&*7?)eI!i  
  二、编程步骤 DV\`Wv  
@1 U&UH  
  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"; j^;I3_P  
jGEt+\"/QJ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; lmxr oHE  
-t2+|J*  
  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; FcRW;e8-  
_jNj-)RB_  
  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; v}tag#f5>?  
ZP;j9 T!  
  5、 添加代码,编译运行程序。 _=NwQu\_F  
mN>h5G>a  
三、程序代码 ~d%Pnw|  
3v mjCm  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL )Jk0v_ X  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) mXUGe:e8  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ DWID$w  
#if _MSC_VER > 1000 &/uu)v  
#pragma once t@R ?Rgu3  
#endif // _MSC_VER > 1000 -GqT7`:(H4  
#ifndef __AFXWIN_H__ &p}$J )q  
#error include 'stdafx.h' before including this file for PCH n%k!vJ)]  
#endif %c [F;ug  
#include "resource.h" // main symbols VsN pHQG]  
class CHookApp : public CWinApp a_ `[Lj  
{ mFSw@CC  
 public: 0\:(ageY?  
  CHookApp(); lNL6M%e$Q  
  // Overrides 't_[dSO  
  // ClassWizard generated virtual function overrides t: IN,Kl4  
  //{{AFX_VIRTUAL(CHookApp) FRS>KO=3  
 public: {2+L @  
  virtual BOOL InitInstance(); ;[W"mlM  
  virtual int ExitInstance(); <IC~ GqXv  
  //}}AFX_VIRTUAL ;w%*M}`5  
  //{{AFX_MSG(CHookApp) cFJ-Mkl l  
  // NOTE - the ClassWizard will add and remove member functions here. T[sDVkCbxf  
  // DO NOT EDIT what you see in these blocks of generated code ! B7]C]=${m  
  //}}AFX_MSG ^B@Wp  
  DECLARE_MESSAGE_MAP() rDQ!zlg>l  
}; 3nu^l'WQ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ,WG<hgg-U)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Y;e,Gq`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Nof3F/2 N&  
BOOL InitHotkey(); 7\9>a  
BOOL UnInit(); {qmdm`V[  
#endif s.x&LG  
L W;heO"  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.  k0  
#include "stdafx.h" X*,%&6O*  
#include "hook.h" sL@U  
#include <windowsx.h> KLL;e/Gf  
#ifdef _DEBUG V h k _  
#define new DEBUG_NEW Tzn tO9P+  
#undef THIS_FILE cP}KU5j  
static char THIS_FILE[] = __FILE__; u&9 r2R959  
#endif ]\xy\\b/`  
#define MAX_KEY 100 K"0PTWt  
#define CTRLBIT 0x04 >NKe'q<)3  
#define ALTBIT 0x02 v $7EvFS  
#define SHIFTBIT 0x01 LK;k'IJ  
#pragma data_seg("shareddata") \igmv]G%  
HHOOK hHook =NULL; G <uyin>  
UINT nHookCount =0; GQl$yZaK{  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey +8#_59;x  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Cxcr/9  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey l%`F&8K  
static int KeyCount =0; XO9M_*Va  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Ga^Zb^y  
#pragma data_seg() 8-lOB  
HINSTANCE hins; r)1'ePI"  
void VerifyWindow(); WJ d%2pO]  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) s-RQMK}H  
//{{AFX_MSG_MAP(CHookApp) w,Lvt }  
// NOTE - the ClassWizard will add and remove mapping macros here. OKP9CLg9  
// DO NOT EDIT what you see in these blocks of generated code! q-rB2  
//}}AFX_MSG_MAP 8>.J1C  
END_MESSAGE_MAP() ?  BE6  
6}(J6T46M[  
CHookApp::CHookApp() p<&Xd}]"^W  
{ @0eHS +  
 // TODO: add construction code here, 4WN3=B  
 // Place all significant initialization in InitInstance dTL5-@  
} R-RDT9&<  
:mS# h@l  
CHookApp theApp; 3"kd jOB  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) NO0"*c;  
{ 9XHz-+bQ  
 BOOL bProcessed=FALSE; W?We6.%  
 if(HC_ACTION==nCode) sz9G3artK&  
 { M#4QQ} F.  
  if((lParam&0xc0000000)==0xc0000000){// Key up 0UH*\<R  
   switch(wParam) 3VUWX5K?  
   { ^47PLLRP  
    case VK_MENU: u- o--q  
     MaskBits&=~ALTBIT; A#W?2k9  
     break; g1UGd  
    case VK_CONTROL: Kv@e I$t5  
     MaskBits&=~CTRLBIT; [J C:  
     break; v"MX>^/<  
    case VK_SHIFT: % ',F  
     MaskBits&=~SHIFTBIT; qA:#iJ8w  
     break; O0:)X)b  
    default: //judge the key and send message if)Y9:{r^  
     break; k`{@pt.  
   } yCXrVN:`,  
   for(int index=0;index<MAX_KEY;index++){ X/; p-KX  
    if(hCallWnd[index]==NULL) 6AP~]e 8  
     continue; ?6k}ii!c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) * FeQ*`r  
    { -@F fU2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `?y<>m*  
     bProcessed=TRUE; -3&G"hfK  
    } 2qHf'  
   } >F@qpjoQE  
  } >;#=gM  
  else if((lParam&0xc000ffff)==1){ //Key down enTW0U}  
   switch(wParam) 5PIZh<  
   { T?p`)  
    case VK_MENU: yE\wj  
     MaskBits|=ALTBIT; j6,ZEm  
     break; kip`Myw+  
    case VK_CONTROL: {i*2R^5  
     MaskBits|=CTRLBIT; KZbR3mi,  
     break; ZO7&vF}  
    case VK_SHIFT: MzYavg`  
     MaskBits|=SHIFTBIT; |T4kqW{  
     break; @O}7XRJ_8  
    default: //judge the key and send message $f pq 3  
     break; ~aXqU#8  
   } m,R Dr  
   for(int index=0;index<MAX_KEY;index++) {3Y )rY!z  
   { ]}mxY vu_i  
    if(hCallWnd[index]==NULL) 3:5DL!Sm8J  
     continue; &6j<ca  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) XYH|;P6K  
    { CN2_bz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); P0i V<T4^  
     bProcessed=TRUE; o]LRzI  
    } / EMJSr  
   } 5y} v{Ijt  
  } :+%Zh@u\  
  if(!bProcessed){ >az;!7~cD  
   for(int index=0;index<MAX_KEY;index++){ O%f8I'u$  
    if(hCallWnd[index]==NULL) [,~TaP}m  
     continue; UzKFf&-:;K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .la&P,j_L  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); MDRe(rF=  
   } )B!d,HKt;  
  } ,&YTj>  
 } Zw] ?.  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  y\F=ui  
} Qpt&3_   
zTD@  
BOOL InitHotkey() Bd3~EbFL  
{ _}mK!_`  
 if(hHook!=NULL){  jAND7&W  
  nHookCount++; t=R6mjb  
  return TRUE; ]bgY6@M  
 } #*c F8NV-  
 else [WB{T3j  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); S)A'Y]2X  
  if(hHook!=NULL) (vJ2z =z  
   nHookCount++; &,i~cG?  
  return (hHook!=NULL); oh#> 5cA8  
} &kQ!KA28  
BOOL UnInit() =Z sGT  
{ IC{F.2D  
 if(nHookCount>1){ Gy@7Xf  
  nHookCount--; m= b~i^@  
  return TRUE; gor <g))\  
 } }'=h 4yI  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 0+b 0<  
 if(unhooked==TRUE){ m_!U}!  
  nHookCount=0; NNa1EXZ[  
  hHook=NULL; 2N~ E' 25  
 } 3^.8.q(6  
 return unhooked; \NXQ  
} M0-,M/]l  
QMk+RM8U  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  yu ,h\  
{ BN@,/m9OQ%  
 BOOL bAdded=FALSE; mEQ!-p   
 for(int index=0;index<MAX_KEY;index++){ ?A7Yk4Y.?N  
  if(hCallWnd[index]==0){ c[0oh.  
   hCallWnd[index]=hWnd; -)<m S  
   HotKey[index]=cKey; ., :uZyG  
   HotKeyMask[index]=cMask; _1jw=5^P\i  
   bAdded=TRUE; nDlO5 pe"d  
   KeyCount++; IbWPlbH  
   break; vN{-?  
  } `ycU-m==  
 } }r2[!gGd%|  
 return bAdded; Y5-kj,CB  
} sIm#_+Y  
^p_u.P  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 135vZ:S  
{ zH'2s-.bi  
 BOOL bRemoved=FALSE; +=8X8<Pu  
 for(int index=0;index<MAX_KEY;index++){ FBsn;,3<W  
  if(hCallWnd[index]==hWnd){ y,<$X.>QO|  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ yty` 2$O  
    hCallWnd[index]=NULL; =J@`0H"  
    HotKey[index]=0; 4R+P  
    HotKeyMask[index]=0; @+^c"=d1S  
    bRemoved=TRUE; wk 02[  
    KeyCount--; E '%lxr  
    break; eO{@@?/y  
   } 67J*&5? |  
  } w{'2q^>6*  
 } D{AFL.r{  
 return bRemoved; 2q %K)h  
} m{&w{3pQk  
fW~*6ln  
void VerifyWindow() 7<yp"5><)  
{ abZdGnc  
 for(int i=0;i<MAX_KEY;i++){ (5;D7zdA  
  if(hCallWnd!=NULL){ /R%^rz'w  
   if(!IsWindow(hCallWnd)){ fr#Qz{  
    hCallWnd=NULL; yL"i  
    HotKey=0; #'>?:k  
    HotKeyMask=0; +8UdvMN  
    KeyCount--; pN$;!  
   } \ $;~74}  
  } Z5>V{o  
 } <F=Dj*]  
} Lp~^*j(  
b~W)S/wF$P  
BOOL CHookApp::InitInstance() 8^w/HCC8O  
{ \|Qb[{<:,  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); p^8 JLC  
 hins=AfxGetInstanceHandle(); ] C,1%(  
 InitHotkey(); 6wpU6NU  
 return CWinApp::InitInstance(); ;i9>}]6  
} >Me]m<$E;  
B~_Spp  
int CHookApp::ExitInstance() >Zdi5') 5  
{ dYyW]nZ&  
 VerifyWindow(); ~Oh=   
 UnInit(); g+9v$[!  
 return CWinApp::ExitInstance(); !BRcq~-.  
} IIax gfhZ  
XOxB (0@  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?f@ 9nph  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) .&chdVcxyS  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ rB evVc![  
#if _MSC_VER > 1000 (b|#n|~?YL  
#pragma once d +xA:  
#endif // _MSC_VER > 1000 P Ey/k.  
1CiA 8  
class CCaptureDlg : public CDialog S$K}v,8.sr  
{ M]B3vPA/v  
 // Construction W^(Iw%ek  
 public: o PaZ  
  BOOL bTray; wA r~<  
  BOOL bRegistered; ! o^Ic`FhS  
  BOOL RegisterHotkey(); 0l1.O2 -  
  UCHAR cKey; u0 BMyH  
  UCHAR cMask; -,/3"}<^78  
  void DeleteIcon(); 9>{t}I d  
  void AddIcon(); &Y=.D:z<  
  UINT nCount; 3`rIV*&_{  
  void SaveBmp(); eKJ:?Lxv;  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor M,JA;a, _  
  // Dialog Data &gWiu9WbS  
  //{{AFX_DATA(CCaptureDlg) !u%9;>T7  
  enum { IDD = IDD_CAPTURE_DIALOG }; 2C{/`N  
  CComboBox m_Key; Wo2 v5-  
  BOOL m_bControl; &<=e_0zT  
  BOOL m_bAlt; `A"Q3sf%  
  BOOL m_bShift; A: c]1  
  CString m_Path; ixzTJ]yu  
  CString m_Number; ;ct)H* y  
  //}}AFX_DATA -? Tz.y&  
  // ClassWizard generated virtual function overrides 3]_qj*V  
  //{{AFX_VIRTUAL(CCaptureDlg) 'f6PjI  
 public: +l.|kkZ?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ` #=fA  
 protected: v D&Kae<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support lJ'trYaq7  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Ym:{Mm=ud  
  //}}AFX_VIRTUAL  s<d!+<  
  // Implementation KJ pj  
 protected: N GSS:  
  HICON m_hIcon; Pn J*Zea  
  // Generated message map functions mb~./.5F  
  //{{AFX_MSG(CCaptureDlg) ;'hi9L  
  virtual BOOL OnInitDialog(); Lb^(E-  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); W'V@  
  afx_msg void OnPaint(); >"bnpYSe  
  afx_msg HCURSOR OnQueryDragIcon(); -+' #*V  
  virtual void OnCancel(); } m6\C5  
  afx_msg void OnAbout(); K@*rVor{  
  afx_msg void OnBrowse(); +Tp%5+E  
  afx_msg void OnChange(); n_u`B|^Pj  
 //}}AFX_MSG j,4,zA1j|  
 DECLARE_MESSAGE_MAP() `>\4"`I  
}; }<.7xz|V  
#endif  'X|v+ ?  
mHHzCKE,  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file s1Okoxh/!V  
#include "stdafx.h" m'SmN{(t  
#include "Capture.h" 1N>6rN  
#include "CaptureDlg.h" `LE^:a:8,  
#include <windowsx.h> s{cKBau  
#pragma comment(lib,"hook.lib") ;*.(.  
#ifdef _DEBUG w'|&5cS  
#define new DEBUG_NEW +!Q!m 3/I  
#undef THIS_FILE Yg$@Wb6  
static char THIS_FILE[] = __FILE__; '1]+8E `Z  
#endif zfirb  
#define IDM_SHELL WM_USER+1 n'ehB%"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [h^f%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C#ZhsWS!b  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Y=3X9%v9g  
class CAboutDlg : public CDialog [pr 9 $Jr  
{ &7fY_~)B  
 public: T6,V  
  CAboutDlg(); % <^[j^j}o  
  // Dialog Data G{/;AK  
  //{{AFX_DATA(CAboutDlg) )F +nSV;  
  enum { IDD = IDD_ABOUTBOX }; fWd~-U0M^  
  //}}AFX_DATA L)1C'8 ).  
  // ClassWizard generated virtual function overrides D>ojW|@}  
  //{{AFX_VIRTUAL(CAboutDlg) D9,e3.?p  
 protected: 7F=2t_2O  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support P&,hiGTDi  
  //}}AFX_VIRTUAL >/8ru*Oc  
  // Implementation I'xC+nL@  
 protected: R04.K !  
  //{{AFX_MSG(CAboutDlg) c1PViko,>  
  //}}AFX_MSG Q6eN+i2 ;  
  DECLARE_MESSAGE_MAP() y{YXf! AS  
}; }Z"28?  
kSB3KR;~n  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) "$]ls9-%n  
{ gH5CB%)  
 //{{AFX_DATA_INIT(CAboutDlg) vJ~4D*(]l  
 //}}AFX_DATA_INIT s c5\( b  
} Sy4 mZ}:  
a5X`jo  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) W^003*m~~K  
{ Q^[e/U,  
 CDialog::DoDataExchange(pDX); p}96uaC1  
 //{{AFX_DATA_MAP(CAboutDlg) 1!X1wCT  
 //}}AFX_DATA_MAP .4I w=T_  
} 2]2{&bu  
W)|c[Q\  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) t3pZjdLJd  
 //{{AFX_MSG_MAP(CAboutDlg) HE*7\"9  
 // No message handlers (QhG xuC  
 //}}AFX_MSG_MAP .V8/ELr]  
END_MESSAGE_MAP() C:rRK*  
7t ZW^dF  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %)BwE  
: CDialog(CCaptureDlg::IDD, pParent) #-}kG"  
{ WC3W+v G7  
 //{{AFX_DATA_INIT(CCaptureDlg) eVZa6la"  
  m_bControl = FALSE; .4H_Zt[2  
  m_bAlt = FALSE; f3/SO+Me}  
  m_bShift = FALSE; &t~zD4u B  
  m_Path = _T("c:\\"); <9ePi9D(  
  m_Number = _T("0 picture captured."); h U 9\y  
  nCount=0; }Q!h ov  
  bRegistered=FALSE; Q^*G`&w,  
  bTray=FALSE; *^X#Eb  
 //}}AFX_DATA_INIT d&NCFx  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 P4hZB_.=  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); fL(':W&n-  
} 5ze`IY  
P{"  WlJ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 0[V&8\S~'T  
{ (m<R0  
 CDialog::DoDataExchange(pDX); .=>\Qq%  
 //{{AFX_DATA_MAP(CCaptureDlg) kuWK/6l4  
  DDX_Control(pDX, IDC_KEY, m_Key); IRlN++I!  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 6e-#XCR{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); FYp|oD2=1  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); f<g>dQlE  
  DDX_Text(pDX, IDC_PATH, m_Path); jK\V|5k  
  DDX_Text(pDX, IDC_NUMBER, m_Number); "}0)YRz%  
 //}}AFX_DATA_MAP +R2^* *<  
} a];BW)  
I~d#p ]>  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) F9Ifw><XM  
//{{AFX_MSG_MAP(CCaptureDlg) mGt\7&`  
 ON_WM_SYSCOMMAND() [u/zrpTk  
 ON_WM_PAINT() kyy0&L  
 ON_WM_QUERYDRAGICON() }l,T~Pjb  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) }5fU7&jA;3  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 0|.7Kz^  
 ON_BN_CLICKED(ID_CHANGE, OnChange) C<r(-qO{5  
//}}AFX_MSG_MAP *eHA: A_I  
END_MESSAGE_MAP() J ZVr&KZN  
}%-UL{3%  
BOOL CCaptureDlg::OnInitDialog() ]cx"  
{ /d{glOk  
 CDialog::OnInitDialog(); QN)/,=#  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8W19#?7>B  
 ASSERT(IDM_ABOUTBOX < 0xF000); JVD@I{  
 CMenu* pSysMenu = GetSystemMenu(FALSE); q,<n,0)K  
 if (pSysMenu != NULL) kb/|;!  
 { pi^^L@@ d  
  CString strAboutMenu; (! xg$Kz@  
  strAboutMenu.LoadString(IDS_ABOUTBOX); )$ ofl%+  
  if (!strAboutMenu.IsEmpty()) aEcktg6h  
  { >&$$(Bp  
   pSysMenu->AppendMenu(MF_SEPARATOR); mgJShn8]  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); B0-4 ZT  
  } ."~7 \E> t  
 } lAdOC5+JX  
 SetIcon(m_hIcon, TRUE); // Set big icon t7{L[C$  
 SetIcon(m_hIcon, FALSE); // Set small icon RnMBGxa  
 m_Key.SetCurSel(0); @m+pr\h(  
 RegisterHotkey(); GCcwEl!K^  
 CMenu* pMenu=GetSystemMenu(FALSE); e#l*/G*,  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); g0^~J2sDd  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); @?<N +qdH>  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); mA&RN"+V  
 return TRUE; // return TRUE unless you set the focus to a control yf `.%  
} 3S[w'  
DePV,.  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) F,' ^se4&  
{ ddUjs8VvJ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) `U {o:  
 { YWt"|  
  CAboutDlg dlgAbout; qR [}EX&3  
  dlgAbout.DoModal(); =q_&* '  
 } 91-P)%?  
 else [<#<:h &\  
 { O, bfdc[g4  
  CDialog::OnSysCommand(nID, lParam); 3R)cbwL  
 } uvu**s  
} (P E# Y(  
_Vdb?  
void CCaptureDlg::OnPaint() @D.R0uM  
{ '+ o:,6  
 if (IsIconic()) y)?W-5zL  
 { pRQ fx^ On  
  CPaintDC dc(this); // device context for painting K^!e-Xi6  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); p?dGZ2` [I  
  // Center icon in client rectangle 7,V!Iv^X  
  int cxIcon = GetSystemMetrics(SM_CXICON); OmTZ-*N  
  int cyIcon = GetSystemMetrics(SM_CYICON); w\"n!^ms  
  CRect rect; eh({K;>  
  GetClientRect(&rect); ]C}u- B746  
  int x = (rect.Width() - cxIcon + 1) / 2; es.\e.HK  
  int y = (rect.Height() - cyIcon + 1) / 2; ,cGwtt(  
  // Draw the icon ,Az`6PW  
  dc.DrawIcon(x, y, m_hIcon); /RA1d<~$q  
 } jSeA %Te  
 else $I}Hk^X  
 { xJ[k#?T'  
  CDialog::OnPaint(); 88tFB  
 } ()@.;R.Z  
} 0[Xt,~  
CX&yjT6`  
HCURSOR CCaptureDlg::OnQueryDragIcon() eZN3H"H  
{ < "L){$  
 return (HCURSOR) m_hIcon; ?)Czl4J  
} &xGfkCP.]  
z:ru68  
void CCaptureDlg::OnCancel() <B ]i80.  
{ Dyouk+08x  
 if(bTray) 1jUhG2y  
  DeleteIcon(); rZ8Y=) e  
  CDialog::OnCancel(); (n":] 8}  
} h}anTFKP  
GvZac  
void CCaptureDlg::OnAbout() RvyBg:Aj5  
{ y~]I Vl"  
 CAboutDlg dlg; AhbT/  
 dlg.DoModal(); }%o+1 <=  
} ;+r)j"W  
.yK\&q[<  
void CCaptureDlg::OnBrowse() 1^x2WlUm4  
{ E&iWtwkz  
 CString str; O]Ry3j  
 BROWSEINFO bi; jM3Y|}+  
 char name[MAX_PATH]; YmO"EWb  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ctc`^#q  
 bi.hwndOwner=GetSafeHwnd(); i">z8?qF  
 bi.pszDisplayName=name; G!e}j @@  
 bi.lpszTitle="Select folder"; DSDl[;3O{s  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; D<_,>{$gW  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); }QWTPRn  
 if(idl==NULL) E+^} B/"  
  return; T}w*K[z $  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); =& Tu`m  
 str.ReleaseBuffer(); Ew?/@KAV\  
 m_Path=str; 7+D'W7Yx  
 if(str.GetAt(str.GetLength()-1)!='\\') j^aQ>(t(9  
  m_Path+="\\"; Cdt,//xrz  
 UpdateData(FALSE); GqIvvnw@f  
} _pH6uuB  
A5.'h<  
void CCaptureDlg::SaveBmp() (. quX@w"m  
{ ,rH)}C<Q+  
 CDC dc; &-8-xw#.  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); RXx?/\~yd;  
 CBitmap bm; qa0JQ_?o]  
 int Width=GetSystemMetrics(SM_CXSCREEN); r_g\_y7ua  
 int Height=GetSystemMetrics(SM_CYSCREEN); Cb@S </b  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ohc/.5Kl  
 CDC tdc; S0Bl?XsD_  
 tdc.CreateCompatibleDC(&dc); _ntW}})K  
 CBitmap*pOld=tdc.SelectObject(&bm); I(?|Ox9"?  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ziLr }/tg  
 tdc.SelectObject(pOld); bn*{*=(|  
 BITMAP btm; 8)-t91hkL  
 bm.GetBitmap(&btm); 5QL9 w3L  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; -aH?7HV}  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); XY+aunLf  
 BITMAPINFOHEADER bih; G"U>fwFuK  
 bih.biBitCount=btm.bmBitsPixel; 2W"cTm  
 bih.biClrImportant=0; AG$-U2ap  
 bih.biClrUsed=0; +3o)L?:g  
 bih.biCompression=0; =qS^Wz.  
 bih.biHeight=btm.bmHeight; DETajf/<F  
 bih.biPlanes=1; Z|Lh^G  
 bih.biSize=sizeof(BITMAPINFOHEADER); ];b!*Z  
 bih.biSizeImage=size; :i,c<k  
 bih.biWidth=btm.bmWidth; t5jhpPVf  
 bih.biXPelsPerMeter=0;  ,3@15j  
 bih.biYPelsPerMeter=0; :|m~<'g  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); vY0V{u?J  
 static int filecount=0; LG&Q>pt.  
 CString name; ~\)&{ '  
 name.Format("pict%04d.bmp",filecount++); d'AviW>  
 name=m_Path+name; E9Xk8w'+  
 BITMAPFILEHEADER bfh; /_k hFw  
 bfh.bfReserved1=bfh.bfReserved2=0; ,],JI|Rl8c  
 bfh.bfType=((WORD)('M'<< 8)|'B'); UwL"%0u  
 bfh.bfSize=54+size; jzJ1+/9  
 bfh.bfOffBits=54; L yA(.  
 CFile bf; e\ l,gQP  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ S)'q:`tZo  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); YAC zznN  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); )(ZPSg$/F  
  bf.WriteHuge(lpData,size); zy/tQGTr@  
  bf.Close(); |{ /O)3  
  nCount++; wh7a|  
 } ^pQ;0[9Y0  
 GlobalFreePtr(lpData); vn%U;}  
 if(nCount==1) h[`Op#^x3  
  m_Number.Format("%d picture captured.",nCount); C(t6;&H  
 else ^d5./M8Bd  
  m_Number.Format("%d pictures captured.",nCount); 7]. IT(  
  UpdateData(FALSE); eZ.0,A*1B1  
} MY<!\4/  
AXU!-er$  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Acq>M^E3  
{ |L_g/e1A3  
 if(pMsg -> message == WM_KEYDOWN) cdtzf:#q  
 { HyX4ob[X  
  if(pMsg -> wParam == VK_ESCAPE) eR* ]<0=  
   return TRUE; .{]c&Ef+f  
  if(pMsg -> wParam == VK_RETURN) 8 {4D|o#O  
   return TRUE; $L#Z?76v  
 } w7t"&=pF7  
 return CDialog::PreTranslateMessage(pMsg); n"d)  
} l#vw L15  
g*AD$":  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) sO4}kxZ  
{ ! ?U^+)^$  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Mevyj;1t  
  SaveBmp(); k89gJ5B$  
  return FALSE; w6In{uO-Z  
} d$pf[DJQo  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ K<7T}XzU$  
 CMenu pop; zju,#%  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^1Zq0  
 CMenu*pMenu=pop.GetSubMenu(0); p|9ECdU>;  
 pMenu->SetDefaultItem(ID_EXITICON); dG~B3xg;5i  
 CPoint pt; vkd<l&zD  
 GetCursorPos(&pt); RAuAIiQ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); K9N0kBJ0<  
 if(id==ID_EXITICON) >->xhlL*  
  DeleteIcon(); 6$vh qg}f  
 else if(id==ID_EXIT) D)~nAkVq  
  OnCancel(); HAUTCX  
 return FALSE; @~U6=(+  
} 9@z|2z2\G  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); $?A Uk  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) v/ 00L R  
 AddIcon(); X3=Jp'p$h  
 return res; y:[VRLo  
} I^\bS  
/2\= sTd  
void CCaptureDlg::AddIcon() nIqY}??  
{ UE`4$^qs  
 NOTIFYICONDATA data; M>H^<N}'A  
 data.cbSize=sizeof(NOTIFYICONDATA); 10I`AjF0  
 CString tip; ?eVuz x  
 tip.LoadString(IDS_ICONTIP); k -DB~-L  
 data.hIcon=GetIcon(0); &Cpxo9-  
 data.hWnd=GetSafeHwnd(); -MW(={#   
 strcpy(data.szTip,tip); Y./}zCT  
 data.uCallbackMessage=IDM_SHELL; RdVis|7o  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; yb.|7U?/x  
 data.uID=98; <QW1fE  
 Shell_NotifyIcon(NIM_ADD,&data); "O1*uwm  
 ShowWindow(SW_HIDE); 6p]R)K>wS  
 bTray=TRUE; [#rdfN'?U  
} eKFc W5O  
H6CGc0NS+  
void CCaptureDlg::DeleteIcon() qH$rvD!]  
{ : )"jh`  
 NOTIFYICONDATA data; .L{+O6*c  
 data.cbSize=sizeof(NOTIFYICONDATA); nIKT w  
 data.hWnd=GetSafeHwnd(); (kNTXhAr4  
 data.uID=98; M^Ay,jK!  
 Shell_NotifyIcon(NIM_DELETE,&data); =^AZx)Kwd  
 ShowWindow(SW_SHOW); +?txGHQq  
 SetForegroundWindow(); C\ >Mt  
 ShowWindow(SW_SHOWNORMAL); @P5@ &G  
 bTray=FALSE; VJtTbt;>  
} f5qHBQ  
D& 6Qk&>  
void CCaptureDlg::OnChange() Y*`A$  
{ I4X+'fW,  
 RegisterHotkey(); XoQk'7"f  
} eh7r'DmAR  
yr 9)ga%  
BOOL CCaptureDlg::RegisterHotkey() ="[](X^ l  
{ `k%#0E*H  
 UpdateData(); kt0{-\ p  
 UCHAR mask=0; L.%~?T[F  
 UCHAR key=0; lLFBop  
 if(m_bControl) {UC<I.5X  
  mask|=4; *P\_:>bV(  
 if(m_bAlt) {s'_zS z  
  mask|=2;  p6l@O3  
 if(m_bShift) -/2$P  
  mask|=1; yy.:0:ema  
  key=Key_Table[m_Key.GetCurSel()]; U\ E{-7  
 if(bRegistered){ >A( C9_\  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); C2|2XL'l(C  
  bRegistered=FALSE; Xg3[v3m|  
 } $AhX@|?z  
 cMask=mask; 4m(>"dHP  
 cKey=key; ]S aH/$  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); pV|?dQ  
 return bRegistered; $M<4Bqr  
} WHLKf  
gN'i+mQcu  
  四、小结 Fj('l  
^JVP2L>o*  
  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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