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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: x+G0J8cW  
  ZoB {x*IH  
  一、实现方法 nA~E "*  
U bYEEY#  
  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: g(| 6~}|o+  
 PTS]7  
#pragma data_seg("shareddata") 8+Bu+|c%f  
HHOOK hHook =NULL; //钩子句柄 g%k`  
UINT nHookCount =0; //挂接的程序数目 P(a.iu5   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 w\19[U3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 g5q$A9.Jl  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 0W%@gs5d&  
static int KeyCount =0; > MH(0+B*  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 E~kG2x{a  
#pragma data_seg() $.:mai  
W k}AmC  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 X.TI>90{  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: (S^8UV  
\-*eL;qP  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR wI5Yn h  
cKey,UCHAR cMask) nL?oTze*p  
{ H-p;6C<  
 BOOL bAdded=FALSE; K)_WL]RJ.4  
 for(int index=0;index<MAX_KEY;index++){ 1+7GUSIb  
  if(hCallWnd[index]==0){ ,2]X}&{i  
   hCallWnd[index]=hWnd; O$ HBO  
   HotKey[index]=cKey; dgo3'ZO  
   HotKeyMask[index]=cMask; 2:LHy[{5  
   bAdded=TRUE; O0PJ6:9P  
   KeyCount++; Gc$gJnQio  
   break; WX4;l(P L=  
  } x3zj ?-  
 } D\H/   
 return bAdded; ayBRWT0  
} |0z;K:5s  
//删除热键 "Y=+Ls(3o(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U'*t~x <  
{ BtY%r7^o  
 BOOL bRemoved=FALSE; /Ky__l!bu  
 for(int index=0;index<MAX_KEY;index++){ -!({B H-M_  
  if(hCallWnd[index]==hWnd){ pDh se2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #pHs@uvO  
    hCallWnd[index]=NULL; _U{&@}3  
    HotKey[index]=0; ! <WBCclX  
    HotKeyMask[index]=0; ,Os? f:Y6  
    bRemoved=TRUE; 7zTqNnPnf  
    KeyCount--; n& $^04+i  
    break; !JBae2Z  
   } {5|("0[F  
  } Ac|5. ?|N  
 } gip/(/NX  
 return bRemoved; RB?V7uX  
} T%R:NQf  
yE} dj)wd  
`O6:t\d@  
  DLL中的钩子函数如下: k6Cn"2q <  
H7[6yh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /b;K  
{ j!z-)p8hy  
 BOOL bProcessed=FALSE; [ REf>_R  
 if(HC_ACTION==nCode) C}5M;|%3)  
 { F%rHU5CkV  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 8Q)@  
   switch(wParam) 26n^Dy>}  
   {  ^ZTGJ(j7~  
    case VK_MENU: ,1/}^f6  
     MaskBits&=~ALTBIT; S|B$c E  
     break; 6> {r6ixs1  
    case VK_CONTROL: \.gEh1HW  
     MaskBits&=~CTRLBIT; l =IeJh  
     break; *V k ^f+5  
    case VK_SHIFT: &2I*0  
     MaskBits&=~SHIFTBIT; tD$lNh^  
     break; 2-0$FQ@/  
    default: //judge the key and send message c6Q(Ygc  
     break; Ejq#~Zhr!  
   } kVS?RHR  
   for(int index=0;index<MAX_KEY;index++){ Ov82ibp_1  
    if(hCallWnd[index]==NULL) s0hBbL0DH  
     continue; ;o<m}bGaT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Tx%VU8\?n  
    { b @;.F!x  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Vga-@  
     bProcessed=TRUE; 2yo cu!4l  
    } (ozb%a#B  
   }  O3NWXe<  
  } [t0rfl{.  
  else if((lParam&0xc000ffff)==1){ //有键按下 ;pRcVL_4  
   switch(wParam) T{vR,  
   { iwY'4 Z e  
    case VK_MENU: $(q>mg:H  
     MaskBits|=ALTBIT; y0ckm6^  
     break; GQ_Ia\  
    case VK_CONTROL: SJgY  
     MaskBits|=CTRLBIT; o{-<L  
     break; E&~nps8e  
    case VK_SHIFT: giavJ|  
     MaskBits|=SHIFTBIT; 7 boJ*  
     break; 3,aN8F1;C  
    default: //judge the key and send message y~<@x.  
     break; dv N<5~  
   } 8Og3yFx[rt  
   for(int index=0;index<MAX_KEY;index++){ pz doqAVI  
    if(hCallWnd[index]==NULL) o!&W sD  
     continue; sP$Ks#/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "t(wG{RxY  
    { >adV(V<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Ov9 Q?8KzM  
     bProcessed=TRUE; _ :^ 7a3I  
    } .+K S`  
   } B>TSdn={>  
  } *9gD*AnM,  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 gY9\o#)<  
   for(int index=0;index<MAX_KEY;index++){ sY;lt.b  
    if(hCallWnd[index]==NULL) /owO@~G  
     continue; PQj<[rY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ] y1fM0  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); tjv\)Nn'  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 rlznwfr7+  
   } QYThW7S  
  } ~S(^T9R  
 } 2RppP?M!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); V{Q kN7-  
} NyPd5m:  
%c6E-4b  
  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<& qp  
G5'_a$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]7qiUdxt:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); fUcLfnr  
)fh0&Y; R  
  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: et$uP  
.]76!(fWZ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =ak7ld A=2  
{ 9XV^z*E(J  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) (a{ZJI8_  
 { >xd<YwXZ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 t<b3K-  
  SaveBmp(); ?~2Bi^W5  
  return FALSE; xRX>|S  
 } >#N[GrJAE  
 …… //其它处理及默认处理 YL^Z4: p  
} XizPMN5a  
V,LVB_6  
m4/}Jx[  
  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。 p#H]\ P'  
QB1M3b  
  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。 Q_}/ Pn$1  
m)f|:MM  
  二、编程步骤 ?y-s20Kd  
4#Eul  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Jyu`-=It  
|f NMs  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; kX8=cL9G  
-i_En^Fi  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ~b8a^6:R"  
lfy7w|  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; AQ@v>wr}  
NJ$e6$g)  
  5、 添加代码,编译运行程序。 koH4~m{  
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三、程序代码 &`@M8-m#F  
T"W9YpZ  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL %ejeyc  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 3Xdn62[&  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ="B n=>  
#if _MSC_VER > 1000 .5g}rxO8  
#pragma once 7c::Qf[|  
#endif // _MSC_VER > 1000 !Z/$}xxj  
#ifndef __AFXWIN_H__ H`D f  
#error include 'stdafx.h' before including this file for PCH s)tpr   
#endif )vHi|~(   
#include "resource.h" // main symbols V} bM!5 H  
class CHookApp : public CWinApp R=35 7^[R  
{ ){tPP$-i=  
 public: z~.9@[LG]  
  CHookApp(); ~ hD{coVTI  
  // Overrides C ktX0  
  // ClassWizard generated virtual function overrides l10-XU02  
  //{{AFX_VIRTUAL(CHookApp) *g$agyOfh  
 public: X')S;KW  
  virtual BOOL InitInstance(); $,P\)</ VR  
  virtual int ExitInstance(); ;](h2Z`3s  
  //}}AFX_VIRTUAL :r39wFi  
  //{{AFX_MSG(CHookApp) I*c;hfu  
  // NOTE - the ClassWizard will add and remove member functions here. }jcIDiSu  
  // DO NOT EDIT what you see in these blocks of generated code ! Opry`}5h  
  //}}AFX_MSG n2E4!L|q  
  DECLARE_MESSAGE_MAP() MF|*AB|E  
}; a4u^f5)@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 5&qY3@I7l  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #PH#2/[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]BfR.,,  
BOOL InitHotkey(); {_as!5l  
BOOL UnInit(); b_ JWnh  
#endif Bbs5f@E  
f+^c@0que  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. xOM_R2Md  
#include "stdafx.h" .Qk{5=l6P  
#include "hook.h" `]hCUaV   
#include <windowsx.h> `5<1EGJsD  
#ifdef _DEBUG HPTHF  
#define new DEBUG_NEW "GLYyC  
#undef THIS_FILE x-4J/tm  
static char THIS_FILE[] = __FILE__; LT(?#)D  
#endif TMY{OI8a  
#define MAX_KEY 100 &oc_ a1 R  
#define CTRLBIT 0x04 5U;nhDmM  
#define ALTBIT 0x02 5m 3'Gt4  
#define SHIFTBIT 0x01 #4q1{)=  
#pragma data_seg("shareddata") '^B3pR:  
HHOOK hHook =NULL; 1<ehV VP   
UINT nHookCount =0; N&N 82OG  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey =g[H]-Ee  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT M1gP R  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey X{'wWWZC  
static int KeyCount =0; &%}6q]e  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift V7n >,k5  
#pragma data_seg() <THUsY`3P&  
HINSTANCE hins; xiJz`KD&  
void VerifyWindow(); x cnt?%%M  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) [>wzl"cHW  
//{{AFX_MSG_MAP(CHookApp) Pzptr%{  
// NOTE - the ClassWizard will add and remove mapping macros here. EaCZx  
// DO NOT EDIT what you see in these blocks of generated code! cb4b, Ri  
//}}AFX_MSG_MAP 1{7_ `[  
END_MESSAGE_MAP() uc\.oG;~q  
wmiafBA e  
CHookApp::CHookApp() -7,vtd[h  
{ gb9[Meg'  
 // TODO: add construction code here, i&1U4q  
 // Place all significant initialization in InitInstance o6/Rx#A  
} .&L^J&V  
,0FwBK  
CHookApp theApp; =E; #OZO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) CHg]Ul  
{ w2@"PGR  
 BOOL bProcessed=FALSE; o6:45  
 if(HC_ACTION==nCode) LEA;dSf  
 { Kj=;>u  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8`DO[Z  
   switch(wParam) T[m ~6  
   { Q{8qm<0g  
    case VK_MENU: SUo^c1)G  
     MaskBits&=~ALTBIT; rEg+i@~  
     break; <gR`)YF7  
    case VK_CONTROL: 8 `o{b"l+  
     MaskBits&=~CTRLBIT; Gk{W:866  
     break; V!H(;Tuuo  
    case VK_SHIFT: ]}/mFY?7  
     MaskBits&=~SHIFTBIT; O<bDU0s{M  
     break; z,M'Tr.1|  
    default: //judge the key and send message n~9 i^  
     break; nx D'r  
   } tb:    
   for(int index=0;index<MAX_KEY;index++){ 0&f\7z  
    if(hCallWnd[index]==NULL) ?C FS}v  
     continue; TJE% U0Ln  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {$3j/b  
    {  JUmw$u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ko]QCLL  
     bProcessed=TRUE; 8>2&h  
    } ws. ?cCTpt  
   } "h QV9 [2\  
  } z( *]'Y  
  else if((lParam&0xc000ffff)==1){ //Key down 6xyY+  
   switch(wParam) FBYll[8  
   { )K8P+zn~  
    case VK_MENU: dEL3?-;'  
     MaskBits|=ALTBIT; 5Zzr5 WM  
     break; n#)PvV~  
    case VK_CONTROL: C0P*D,  
     MaskBits|=CTRLBIT; aX:#'eDB  
     break; 5DmCxg  
    case VK_SHIFT: ;gdi=>S_  
     MaskBits|=SHIFTBIT; S!u6dz^[$X  
     break;  dD:  
    default: //judge the key and send message T4Xtuu1  
     break; 4,gol?a  
   } =rtS#u Y  
   for(int index=0;index<MAX_KEY;index++) yi sF5`+  
   { xGwTk  
    if(hCallWnd[index]==NULL) poTl|y @  
     continue;  bkxk i@t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?rky6  
    { %3ou^mcj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); U.HoFf+HN  
     bProcessed=TRUE; .MzOLv   
    } mu 2 A%"7  
   } -m E  
  }  { VS''Lv  
  if(!bProcessed){ hEVjeC  
   for(int index=0;index<MAX_KEY;index++){ bcUC4g\9N  
    if(hCallWnd[index]==NULL) UwZu:[T6H  
     continue; r9+E'\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) H&~5sEGa  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ]z+*?cc  
   } ROPC |  
  } =fL6uFmxI@  
 } E]e, cd  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @TdQZZ}G\x  
} v<{wA`'R+  
A Z]P+v  
BOOL InitHotkey() -08&&H  
{ (Nm}3p  
 if(hHook!=NULL){ aJEbAs}  
  nHookCount++; tniPEmeS  
  return TRUE; 8f /T!5  
 } a v'd%LZP  
 else [`y:M&@  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); C}n[?R  
  if(hHook!=NULL) MMd0O X)P  
   nHookCount++; TS\9<L9S  
  return (hHook!=NULL); Uc_'3|e  
} LDT'FwMjy  
BOOL UnInit() z0\;m{TH  
{ GS$ZvO  
 if(nHookCount>1){ c-[Q,c  
  nHookCount--; aQl?d<|+lk  
  return TRUE; MZ;"J82p  
 } ,Wz[tYL*  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 6U;Jg_zS  
 if(unhooked==TRUE){ 9@$tiDV  
  nHookCount=0; #H'sZv  
  hHook=NULL; "Czz,;0  
 } fR+Ov8PCq  
 return unhooked; 73'U#@g6  
}  R4&|t  
9 Q0#We*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _F}IF9{?G  
{ _#/!s]$d#  
 BOOL bAdded=FALSE; [ c ~LY4:  
 for(int index=0;index<MAX_KEY;index++){ H.jLGe>  
  if(hCallWnd[index]==0){ ,ma Aw}=  
   hCallWnd[index]=hWnd; "[%;B0J  
   HotKey[index]=cKey; ZAI1p+  
   HotKeyMask[index]=cMask; 2neF<H?^o  
   bAdded=TRUE; A8_\2'b  
   KeyCount++; kS@9c _3S  
   break; I>A^5nk  
  } `f\5p+!<7R  
 } =XZF.ur  
 return bAdded; R=][>\7]}  
} ;FV~q{  
!L &=?CX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Zp/qs z(]  
{ ^2&O3s  
 BOOL bRemoved=FALSE; Uq9,(tV`6g  
 for(int index=0;index<MAX_KEY;index++){ wQF&GGY R  
  if(hCallWnd[index]==hWnd){ <7vIh0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ",MK'\E  
    hCallWnd[index]=NULL;  aX>4Tw  
    HotKey[index]=0; ?)A]q' O  
    HotKeyMask[index]=0; "o\6k"_c>  
    bRemoved=TRUE; G=r(SJq  
    KeyCount--; Gk{ "O%AE  
    break; 4 +da  
   } ]7#^])>  
  } LV}UBao5n  
 } OhSt6&+  
 return bRemoved; |%M{k A-  
} ^yn[QWFO  
'0'"k2"vC  
void VerifyWindow() hW0,5>[7%  
{ Ff)~clIK '  
 for(int i=0;i<MAX_KEY;i++){ adRNrt*!  
  if(hCallWnd!=NULL){ r6O7&Me<  
   if(!IsWindow(hCallWnd)){ '<R B  
    hCallWnd=NULL; V\iIvBpWg  
    HotKey=0; q;1VF;<"vH  
    HotKeyMask=0; oiTMP`Y  
    KeyCount--; )z ?&" I  
   } ~|aeKtCs(.  
  } USnD7I/b  
 } `@u+u0  
} vSyi}5D  
_0DXQS\  
BOOL CHookApp::InitInstance() beN>5coP%A  
{ "6`)vgI~  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); wu&|~@_s@  
 hins=AfxGetInstanceHandle(); b6LC$"t0  
 InitHotkey(); E]HND.`*>  
 return CWinApp::InitInstance(); D+*uKldS;  
} +WV_`Rx#  
e5WdK  
int CHookApp::ExitInstance() >6.[i@RmWU  
{ Xa?6#  
 VerifyWindow(); 4e(9@OLP  
 UnInit(); ;qMnO_ E  
 return CWinApp::ExitInstance(); Ov~S2?E8  
} 5CH-:|(;=  
S`GXiwk  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [B2>*UPl  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Hnd9T(UB  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ )|{1&F1  
#if _MSC_VER > 1000 UtW"U0A  
#pragma once i(&6ys5  
#endif // _MSC_VER > 1000 'y+bx?3Z  
p5twL  
class CCaptureDlg : public CDialog NE=#5?6%g7  
{ _Cv[`e.  
 // Construction *uI hxMX  
 public: K-"HcHuF  
  BOOL bTray; 3zA8pI w  
  BOOL bRegistered; a.Rp#}f  
  BOOL RegisterHotkey(); 1,%#O;ya  
  UCHAR cKey; rHC+nou  
  UCHAR cMask; Q C\,  
  void DeleteIcon(); OIXAjU*N  
  void AddIcon(); RAv RNd  
  UINT nCount; V:0uy>  
  void SaveBmp(); JEm?26n X  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor wH(vX<W-E  
  // Dialog Data G+ $)W u  
  //{{AFX_DATA(CCaptureDlg) zP{<0o  
  enum { IDD = IDD_CAPTURE_DIALOG }; $8X tI  
  CComboBox m_Key; Dvq*XI5  
  BOOL m_bControl; gT5Ji~xI  
  BOOL m_bAlt; TQ5MKqR$  
  BOOL m_bShift; XW&8T"q7  
  CString m_Path; Q[ 9rA  
  CString m_Number; ,/w852|ub  
  //}}AFX_DATA [F AOp@7W  
  // ClassWizard generated virtual function overrides lE2wkY9^/  
  //{{AFX_VIRTUAL(CCaptureDlg) Oc"'ay(g  
 public: Vlp*'2VO  
  virtual BOOL PreTranslateMessage(MSG* pMsg); [MQJ71(3  
 protected: [o[v"e\w  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support cmr6,3_  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); njwR~aL`|  
  //}}AFX_VIRTUAL  [A%e6  
  // Implementation @KXz4PU  
 protected: 08K.\3  
  HICON m_hIcon; 3@Zz-~4Td  
  // Generated message map functions V'.eesN  
  //{{AFX_MSG(CCaptureDlg) b W C~Hv  
  virtual BOOL OnInitDialog(); yqVaA 'w5  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); *OGXu07 !  
  afx_msg void OnPaint(); @E"+qPp.3  
  afx_msg HCURSOR OnQueryDragIcon(); ;@7 #w  
  virtual void OnCancel(); p^zEfLTU  
  afx_msg void OnAbout(); d_W nK{  
  afx_msg void OnBrowse(); Wf`Oye Rz  
  afx_msg void OnChange(); :#W>SO  
 //}}AFX_MSG Hs4zJk  
 DECLARE_MESSAGE_MAP() P^_d$  
}; Ng_rb KXC#  
#endif 'Qs 3  
%:be{Y6  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file RZ/+ K=  
#include "stdafx.h" Og;$P 'U  
#include "Capture.h" C5sN[  
#include "CaptureDlg.h" ;qVEI/  
#include <windowsx.h> >;'1k'  
#pragma comment(lib,"hook.lib") ;@ll  
#ifdef _DEBUG m)[wZP*e  
#define new DEBUG_NEW h@>rjeY@  
#undef THIS_FILE G5QgnxwP2  
static char THIS_FILE[] = __FILE__; &J&w4"0N'  
#endif '/yx_R K2?  
#define IDM_SHELL WM_USER+1 $ Op/5j  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {^$"/hj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); HDW\S#  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 1:;&wf  
class CAboutDlg : public CDialog LnRi+n[@7  
{ A]SB c2   
 public: RP@idz  
  CAboutDlg(); t 1RwB23  
  // Dialog Data 8#Z\}gGz  
  //{{AFX_DATA(CAboutDlg) %dk$K!5D0  
  enum { IDD = IDD_ABOUTBOX }; ^qzT5W\@  
  //}}AFX_DATA MlC-Aad(  
  // ClassWizard generated virtual function overrides K` _E>k  
  //{{AFX_VIRTUAL(CAboutDlg) gH{\y5%rO  
 protected: C#?d=x  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _KkVI7a  
  //}}AFX_VIRTUAL x4m_(CtK  
  // Implementation |_xiG~  
 protected: "w|k\1D  
  //{{AFX_MSG(CAboutDlg) seD+~Y\z  
  //}}AFX_MSG xX4^nem\G  
  DECLARE_MESSAGE_MAP() 'xrbg]b%  
}; IwgA A)H  
milK3+N  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |z7Crz  
{ TaHi+  
 //{{AFX_DATA_INIT(CAboutDlg) ,tR'0&=  
 //}}AFX_DATA_INIT P2:Q+j:PX  
} X"khuyT_  
8JFkeU%yO  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ah6F^Kpl{  
{ %k;FxUKi  
 CDialog::DoDataExchange(pDX); yY g&'3  
 //{{AFX_DATA_MAP(CAboutDlg) K[|P6J   
 //}}AFX_DATA_MAP `SS~=~WY  
} I{g2q B$6  
?e_}X3{  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) R?9Plzt5  
 //{{AFX_MSG_MAP(CAboutDlg) W lLZtgq  
 // No message handlers lSbM)gL  
 //}}AFX_MSG_MAP z Q|x>3   
END_MESSAGE_MAP() U/&qV"Ih  
VQNH@g^gqr  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]zMBZs  
: CDialog(CCaptureDlg::IDD, pParent) }?qnwx.  
{ .HyiPx3^  
 //{{AFX_DATA_INIT(CCaptureDlg) K~ /V  
  m_bControl = FALSE; xo_k"'f+  
  m_bAlt = FALSE; +U/"F|M  
  m_bShift = FALSE; \utH*;J|x  
  m_Path = _T("c:\\"); dv9Pb5i  
  m_Number = _T("0 picture captured."); .idl@%  
  nCount=0; -I-& <+7v  
  bRegistered=FALSE; .W+4sax:  
  bTray=FALSE; 2Ku#j ('  
 //}}AFX_DATA_INIT y`@4n.Q  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 B l/e>@M  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); m}'@S+k^  
} Rw=E_q{  
, G/X"t ~  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 'nDT.i  
{ I/-w65J]  
 CDialog::DoDataExchange(pDX); CY).I`aJ  
 //{{AFX_DATA_MAP(CCaptureDlg) z`:^e1vG  
  DDX_Control(pDX, IDC_KEY, m_Key); rMFZ#38d  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Y(yJ|y&  
  DDX_Check(pDX, IDC_ALT, m_bAlt); i\z0{;f|GX  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); PaeafL65=  
  DDX_Text(pDX, IDC_PATH, m_Path); adE0oXQH"  
  DDX_Text(pDX, IDC_NUMBER, m_Number); IlL   
 //}}AFX_DATA_MAP .&Gtw _  
} qmyZbo|8&  
@dKf]&h%%  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) }N9a!,{P=b  
//{{AFX_MSG_MAP(CCaptureDlg) ]~M {@h!<  
 ON_WM_SYSCOMMAND() 257;@;  
 ON_WM_PAINT() m1; <T@  
 ON_WM_QUERYDRAGICON() k 5r*?Os  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) v;qL? _:=c  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) vHe.+XY  
 ON_BN_CLICKED(ID_CHANGE, OnChange) F"#*8P  
//}}AFX_MSG_MAP O xaua  
END_MESSAGE_MAP() 4wD^?S!p  
Q)X\VQcgj  
BOOL CCaptureDlg::OnInitDialog() &J@ZF<Ib  
{ yWk:u 5  
 CDialog::OnInitDialog(); CKt~#$ I%  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); h?tV>x/Fu  
 ASSERT(IDM_ABOUTBOX < 0xF000); VzM@DM]=~  
 CMenu* pSysMenu = GetSystemMenu(FALSE); vgZPDf|  
 if (pSysMenu != NULL) p;Ok.cXVp  
 { 0 S8{VZpy  
  CString strAboutMenu;  !3M!p&  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 95&sFT C  
  if (!strAboutMenu.IsEmpty()) J 2~B<=V  
  { l+X^x%EA  
   pSysMenu->AppendMenu(MF_SEPARATOR); pR7G/]U$A  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ct/THq  
  } Z$K%@q,10+  
 } "Ksd9,J\b  
 SetIcon(m_hIcon, TRUE); // Set big icon K{h]./%  
 SetIcon(m_hIcon, FALSE); // Set small icon Cu<ojN- $  
 m_Key.SetCurSel(0); .z7f_KX^  
 RegisterHotkey(); pnb$lpxt  
 CMenu* pMenu=GetSystemMenu(FALSE); /!8:/7r+W  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); F qyJ*W\1  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); dsoRPX']=  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); F+-MafN7Y  
 return TRUE; // return TRUE unless you set the focus to a control 2p.+C35c=j  
} 8>+eGz|  
dM.Ow!j  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) >Nqkz?67  
{ @,$HqJ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) @].aFhH`)  
 { |8+rUFkU8  
  CAboutDlg dlgAbout; L| qY  
  dlgAbout.DoModal(); ArKrsI#H-  
 } EqwA8? M  
 else OU=IV;V{  
 { Dp'af4+%$  
  CDialog::OnSysCommand(nID, lParam); ;b2>y>?[  
 } ~i {)J  
} TU6EE  
~a)2 0  
void CCaptureDlg::OnPaint() L7'n<$F  
{ KiHAm|,  
 if (IsIconic())  7cQw?C  
 { 2a}_|#*  
  CPaintDC dc(this); // device context for painting @WUCv7U  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Gwk@X/q  
  // Center icon in client rectangle ~t$VzL1  
  int cxIcon = GetSystemMetrics(SM_CXICON); J sdEA  
  int cyIcon = GetSystemMetrics(SM_CYICON); ../(gG9  
  CRect rect; 9K y,oB  
  GetClientRect(&rect); $>`8'I  
  int x = (rect.Width() - cxIcon + 1) / 2; :udZfA\sW  
  int y = (rect.Height() - cyIcon + 1) / 2; "q8 'tN><  
  // Draw the icon duTSU9  
  dc.DrawIcon(x, y, m_hIcon); wQ95tN  
 } 6n4S$a  
 else @72G*u\Wz  
 { h<jIg$rA  
  CDialog::OnPaint(); 'a9.JS[pj  
 } u(qpdG||7  
} !1]xKNp ]  
eVJL|uI|  
HCURSOR CCaptureDlg::OnQueryDragIcon() o W [-?  
{ RR9s%>^  
 return (HCURSOR) m_hIcon; 7] H4E.(l  
} C_;6-Q%V  
J#^M   
void CCaptureDlg::OnCancel() 3KZ h?~B  
{ o{eG6  
 if(bTray) 7wiu%zfa:=  
  DeleteIcon(); /;J;,G`?  
  CDialog::OnCancel(); V!4E(sX  
} iWsIc\!+,  
Oms`i&}"}  
void CCaptureDlg::OnAbout() ~'Hwszp b  
{ -rrg?4  
 CAboutDlg dlg; +d. Bf  
 dlg.DoModal(); D=+sD"<|  
} 7X"cu6%\  
d DTt_B  
void CCaptureDlg::OnBrowse() =!2   
{ e<pojb1Q  
 CString str; )oCF| 2qc  
 BROWSEINFO bi; U^S0H(>  
 char name[MAX_PATH]; gne c#j  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); qyC"}y-  
 bi.hwndOwner=GetSafeHwnd(); T!AQJ:;1  
 bi.pszDisplayName=name; A#{*A  
 bi.lpszTitle="Select folder"; \>Q,AyL  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ZGBcy}U(k  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); +z_0?x  
 if(idl==NULL) ^8*.r+7p  
  return; P=GM7  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); g [K8G  
 str.ReleaseBuffer(); EJsb{$u  
 m_Path=str; ""=Vt]  
 if(str.GetAt(str.GetLength()-1)!='\\') NiF*h~ q  
  m_Path+="\\"; /vU31_eZt  
 UpdateData(FALSE); A1@a:P=  
} C.Yz<?;S  
`W=JX2I  
void CCaptureDlg::SaveBmp() eAEVpC2  
{ q Sah_N  
 CDC dc; f&J*(F*u  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Nsy.!,!c  
 CBitmap bm; bjZ?WZr  
 int Width=GetSystemMetrics(SM_CXSCREEN); Ea 1>]V  
 int Height=GetSystemMetrics(SM_CYSCREEN); ud1E@4;qf  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ?6gI8K6X  
 CDC tdc; 6{ Eh={:b  
 tdc.CreateCompatibleDC(&dc); 1U!CD-%(  
 CBitmap*pOld=tdc.SelectObject(&bm); 5,3h'\ "!  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); '>8N'*  
 tdc.SelectObject(pOld); D[_2:8  
 BITMAP btm; Y-9F*8<  
 bm.GetBitmap(&btm); [Pl$=[+  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Yp$lc^)c>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); c_ i;'  
 BITMAPINFOHEADER bih; _`_$U MK;  
 bih.biBitCount=btm.bmBitsPixel; \ U_DTI  
 bih.biClrImportant=0; _{8boDX#  
 bih.biClrUsed=0; 01b0;|  
 bih.biCompression=0; \hVFK6  
 bih.biHeight=btm.bmHeight; 9hQ{r 2  
 bih.biPlanes=1; ;F- kE4w  
 bih.biSize=sizeof(BITMAPINFOHEADER); s5 BV8 M  
 bih.biSizeImage=size; {$JIR}4S  
 bih.biWidth=btm.bmWidth; >ZT3gp?E  
 bih.biXPelsPerMeter=0; uFgw eOJ  
 bih.biYPelsPerMeter=0; d #su  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8^~]Ym:  
 static int filecount=0; Cq=c'(cX  
 CString name; Yi3DoaS;"  
 name.Format("pict%04d.bmp",filecount++); ^[6AOz+L  
 name=m_Path+name; )Lq FZ~B  
 BITMAPFILEHEADER bfh; 4?cg6WJ'6  
 bfh.bfReserved1=bfh.bfReserved2=0; f sMF46  
 bfh.bfType=((WORD)('M'<< 8)|'B'); uQ}kq7gd  
 bfh.bfSize=54+size; !{+(oDN  
 bfh.bfOffBits=54; -ydT%x  
 CFile bf; u=5^xpI<D  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ^"I!+Teb  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); P]G2gDO  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); )DW;Gc  
  bf.WriteHuge(lpData,size); S!uyplYKF  
  bf.Close(); <_}u5E)7(  
  nCount++; iD9GAe}x  
 } kE1u-EA  
 GlobalFreePtr(lpData); "&~Um U4CN  
 if(nCount==1) pAYuOk9n  
  m_Number.Format("%d picture captured.",nCount); BQ(`MM@  
 else z]pH'c39  
  m_Number.Format("%d pictures captured.",nCount); MC3{LVNK  
  UpdateData(FALSE); q QQ~ [JL  
} l)zS}"F,  
S; >_9  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) IcN|e4t^J+  
{ N 6eY-`4y  
 if(pMsg -> message == WM_KEYDOWN) Lgy}Gm8u5  
 { }6\p7n  
  if(pMsg -> wParam == VK_ESCAPE) 3Dy.mtP  
   return TRUE; 5,A/6b  
  if(pMsg -> wParam == VK_RETURN) "{}5uth  
   return TRUE; 2Ig.hnHj  
 } ZCa?uzeo]  
 return CDialog::PreTranslateMessage(pMsg); BX?Si1c  
}  z>!b  
?%?@?W>s@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) awUIYAgJ3  
{ 16AYB17  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ /PO5z7n0J  
  SaveBmp(); '{EDdlX  
  return FALSE; )%0#XC^/X5  
} fz%urbJR  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ :jA~zHO  
 CMenu pop; y37@4p^@9  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); W,vb7v'  
 CMenu*pMenu=pop.GetSubMenu(0); r'j*f"uAm  
 pMenu->SetDefaultItem(ID_EXITICON); /D eU`rj  
 CPoint pt; IP-mo!Y.  
 GetCursorPos(&pt); i;cqK&P;]  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); *v6'I-#  
 if(id==ID_EXITICON) z}Q54,9m  
  DeleteIcon(); H}d&>!\}F  
 else if(id==ID_EXIT) nI-\HAX  
  OnCancel(); Gk<h_1WWK  
 return FALSE; >zhbOkR9c  
} tH$Z_(5  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 6HyQm?c>a  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) N=(rl#<  
 AddIcon(); 6g)21Mh#  
 return res; Bb m1&d#  
} >n#Pq{7aF  
.Sm7na K  
void CCaptureDlg::AddIcon() i=Y#kL~f  
{ 0-7xcF@s  
 NOTIFYICONDATA data; N[Fz6,ZG _  
 data.cbSize=sizeof(NOTIFYICONDATA); 3ILEc:<0J  
 CString tip; ZT!DTb B  
 tip.LoadString(IDS_ICONTIP); l =#uy  
 data.hIcon=GetIcon(0); A@GyKx%x$  
 data.hWnd=GetSafeHwnd(); `6'fX[j5  
 strcpy(data.szTip,tip); ~%'M[3Rb  
 data.uCallbackMessage=IDM_SHELL; +~ HL"Vv  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; l%U{Unwu  
 data.uID=98; ) "'J]6  
 Shell_NotifyIcon(NIM_ADD,&data); }oU0J  
 ShowWindow(SW_HIDE); 4Xlq Ym  
 bTray=TRUE;  \:Q)Ef  
} Y~,N,>nITu  
hl8[A-d(R  
void CCaptureDlg::DeleteIcon() mI-$4st]  
{ \ qKh9  
 NOTIFYICONDATA data; /K1YDq<=  
 data.cbSize=sizeof(NOTIFYICONDATA); :9 .ik  
 data.hWnd=GetSafeHwnd(); :\>@yCD  
 data.uID=98; f$R]m2  
 Shell_NotifyIcon(NIM_DELETE,&data); \ 7jK6;R<  
 ShowWindow(SW_SHOW); N,L$+wm  
 SetForegroundWindow(); C/!kMMh>vV  
 ShowWindow(SW_SHOWNORMAL); nF]lSg&]X  
 bTray=FALSE; so1% MV  
} .,I^)8c  
Bf.@B0\  
void CCaptureDlg::OnChange() "4Cb dD//  
{ 40+~;20  
 RegisterHotkey(); yi PMJ  
} THC34u]  
R0vWj9nPh  
BOOL CCaptureDlg::RegisterHotkey() B\`4TU}kE  
{ x^&D8&4^  
 UpdateData(); ; &$djP  
 UCHAR mask=0; rz5AIe>Hm  
 UCHAR key=0; Cjdw@v0;  
 if(m_bControl) *bsS%qD]  
  mask|=4; u.43b8!  
 if(m_bAlt) :T.j;~  
  mask|=2; e2~&I`ct  
 if(m_bShift) fnl~0   
  mask|=1; %8s$l'Q;  
  key=Key_Table[m_Key.GetCurSel()]; Xi$2MyRd  
 if(bRegistered){ sk6C/ '0:  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); B E!HM{-  
  bRegistered=FALSE; cyL"?vR*<  
 } R^4JM,v9x`  
 cMask=mask; }N dknut,  
 cKey=key; #!qa#.Yi  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )ERmSWq/u  
 return bRegistered; _NA[g:DZ&O  
} ye4 T2=  
Bu$Z+o  
  四、小结 ?hHVawt  
{oOzXc6o  
  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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