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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: #6+ FY+/  
  M-NV_W&M  
  一、实现方法 ?6Cz[5\  
rdJm{<  
  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: gw+9x<e  
e73^#O&Xt  
#pragma data_seg("shareddata") d{et8N  
HHOOK hHook =NULL; //钩子句柄 ogM%N  
UINT nHookCount =0; //挂接的程序数目 e]ig!G]  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 GZ!| }$ 8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Dz!fpE'L  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey E< 4l#Z<  
static int KeyCount =0; tg4Y i|5  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 zWw2V}U!  
#pragma data_seg() w)E@*h<Z  
VS#wl|b8  
  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。 QYXx:nIrg  
I~PDaZP  
  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: B}OY /J/*8  
/|{,sWf2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR /9Q3iV$I]  
cKey,UCHAR cMask) r#WT`pav  
{ va/m~k|i  
 BOOL bAdded=FALSE; HLQ"?OFlz  
 for(int index=0;index<MAX_KEY;index++){ w&Dv8Wv+Oq  
  if(hCallWnd[index]==0){ v/uO&iQw5  
   hCallWnd[index]=hWnd; `T/~.`R  
   HotKey[index]=cKey; LW#M@  
   HotKeyMask[index]=cMask; t{!  
   bAdded=TRUE; T1B|w"In  
   KeyCount++; ZWc+),X  
   break; JGiKBm;  
  } #Z=tJ  
 } O9v_y+M+M  
 return bAdded; hf!|\f  
} qv 3^5 d  
//删除热键 <Y 4:'L6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,F+B Wot4  
{ N;F)jO xsl  
 BOOL bRemoved=FALSE; MgnM,95  
 for(int index=0;index<MAX_KEY;index++){ 2.}R  
  if(hCallWnd[index]==hWnd){ !=Y;h[J.p  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?tf&pgo  
    hCallWnd[index]=NULL; 78n}rT%k1  
    HotKey[index]=0; ;y?);!g  
    HotKeyMask[index]=0; ;N+$2w  
    bRemoved=TRUE; dYFzye  
    KeyCount--; 6XEZ4QP}  
    break; fi PIAT}  
   } G" b60RQ  
  } O@8pC+#`Z  
 } 7k{2Upg;  
 return bRemoved; [}nK"4T"Ri  
} m:tiY [c>W  
%/"Oxi^G  
Gtv,Izt  
  DLL中的钩子函数如下: RR1A65B  
Q>}2cDl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) v=Y K8fNi  
{ 1F[L"W;r  
 BOOL bProcessed=FALSE; bTmL5}n  
 if(HC_ACTION==nCode) #$S}3 o  
 { ;:&?=d  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 V BoMT:#  
   switch(wParam) ~ <0Z>qr  
   {  :L?_Y/K  
    case VK_MENU: FD7H@L5  
     MaskBits&=~ALTBIT; }pNX@C#De  
     break;  R)Q 4  
    case VK_CONTROL: 9V1cdb~?"T  
     MaskBits&=~CTRLBIT; P=AS>N^yaL  
     break; O[~x_xeW  
    case VK_SHIFT: S{F-ttS"  
     MaskBits&=~SHIFTBIT; 4Tzd; P6_  
     break; uE_c4Hp  
    default: //judge the key and send message xc 1A$EY  
     break; jX=lAs~6  
   } @ $cUNvI  
   for(int index=0;index<MAX_KEY;index++){ `cP <}^]  
    if(hCallWnd[index]==NULL) .;/L2Jv  
     continue; S^RUw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) r2*<\ax  
    { r >{G`de4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 0V,Nv9!S  
     bProcessed=TRUE; )yee2(S  
    } `qpc*enf0  
   } MKGS`X]<J  
  } ={(j`VSUX0  
  else if((lParam&0xc000ffff)==1){ //有键按下 4|J[Jdj  
   switch(wParam) YB!!/ SX4  
   { T!^Mvat  
    case VK_MENU: }=GM ?,7b  
     MaskBits|=ALTBIT; &TT":FPR  
     break; "~$$  
    case VK_CONTROL: 1kFjas `g  
     MaskBits|=CTRLBIT; [8]m8=n  
     break; g()m/KS<  
    case VK_SHIFT: xPQL?.  
     MaskBits|=SHIFTBIT; jXIEp01  
     break; p5*lEz|$  
    default: //judge the key and send message J/Q|uRpmqr  
     break;  4#rAm"H  
   } |-kEGLH[*V  
   for(int index=0;index<MAX_KEY;index++){ jxY-u+B  
    if(hCallWnd[index]==NULL) b7$}JCn  
     continue; m^tNqJs8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :,F=w0O  
    { 0=[0|`x  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Y6eEGo"K.+  
     bProcessed=TRUE; RO oE%%8I  
    } 0n5UKtB  
   } @>O&Cpt  
  } _Y-$}KwY!  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 rx:lKoOnB  
   for(int index=0;index<MAX_KEY;index++){ ]h@{6N'oNS  
    if(hCallWnd[index]==NULL)  KOS yh<&  
     continue; 0|C[-ppr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7%CIt?Z%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Zoow*`b|$U  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ak=UtDN[  
   } 5-'vB  
  } Z=9dMND  
 } .cR*P<3O  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 60PYCqWc  
} < l[` "0  
V\zsDP  
  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: `^%GN8d}nm  
)73DT3-0$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lG]GlgSs  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); WEC-<fN|Y\  
k+\7B}7F  
  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: q3\!$IM.  
I7Zq}Pxa  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kPJ~X0Fr{t  
{ ?UK:sF| (O  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) +"=~o5k3Q  
 { >B~?dTm  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 s1=u{ET  
  SaveBmp(); '3%*U*I  
  return FALSE; Oxn'bh6R0  
 } 4TJ!jDkox  
 …… //其它处理及默认处理 liG~y|  
} GTFl}t  
-s~p}CQ.  
'%Dg{ zL  
  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。 ZOHRUm  
bX{PSjD  
  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。 g =\13# F  
J~2 CD*v  
  二、编程步骤 r %xB8e9  
j?J=w=.Nx  
  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"; ^K>pT}u  
 * D3  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; w{ m#Yt  
P rt#L8  
  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; JWSq"N  
:wCC^Y]  
  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; _6I>+9#C  
JOHp?3"4  
  5、 添加代码,编译运行程序。 Bcm=G""  
zf")|9j  
三、程序代码 nP)-Y#`~7  
m2MPWy5s  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL <^'{ G  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) V9]uFL  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ~p!QSRu~,b  
#if _MSC_VER > 1000 4+,*sn  
#pragma once <M>#qd@c  
#endif // _MSC_VER > 1000 ZArf;&8  
#ifndef __AFXWIN_H__ n(# c`t*  
#error include 'stdafx.h' before including this file for PCH F~P/*FFK  
#endif c$.T<r)Z  
#include "resource.h" // main symbols P#9-bYNU  
class CHookApp : public CWinApp &`5 :G LV  
{ lc-*8eS  
 public: +{bh  
  CHookApp(); v_.j/2U  
  // Overrides [ 1D)$"  
  // ClassWizard generated virtual function overrides A'(k Yc  
  //{{AFX_VIRTUAL(CHookApp) #|D:f~"d3  
 public: :if5z2PE/  
  virtual BOOL InitInstance(); KK MWD\  
  virtual int ExitInstance(); n]Ebwznt-  
  //}}AFX_VIRTUAL -*5yY#fw}  
  //{{AFX_MSG(CHookApp) C890+(D~  
  // NOTE - the ClassWizard will add and remove member functions here. |W/Hi^YE2  
  // DO NOT EDIT what you see in these blocks of generated code ! n7'<3t  
  //}}AFX_MSG {.%0@{Y  
  DECLARE_MESSAGE_MAP() /iTH0@Kw;  
}; N}1-2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); yO%VzjJhg  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); n/:Z{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); D`5: JR-{  
BOOL InitHotkey(); 5vl2yN  
BOOL UnInit(); EID(M.G  
#endif JCBnFrP  
,9+nfj  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. *+# k{D,  
#include "stdafx.h" ;+! xZOmm  
#include "hook.h" sd7Y6?_C  
#include <windowsx.h> i@%L_[MtA  
#ifdef _DEBUG <`b|L9  
#define new DEBUG_NEW f61]`@Bk  
#undef THIS_FILE l$qmn$Uc  
static char THIS_FILE[] = __FILE__; X]>[Qz)K^  
#endif K T"h74@  
#define MAX_KEY 100 ]*;RHy9  
#define CTRLBIT 0x04 ~n)]dFy  
#define ALTBIT 0x02 gS0,')w  
#define SHIFTBIT 0x01 NdaM9a#TZ  
#pragma data_seg("shareddata") ">0 /8]l  
HHOOK hHook =NULL; jR }*bIzv  
UINT nHookCount =0; _qdWQFuM  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey )Ep@$Gv|S  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT -1dIZy  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 0!)U *+j,  
static int KeyCount =0; -U&098}<K  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift qrOB_Nz  
#pragma data_seg() !k ;[^>  
HINSTANCE hins; ',<{X (#(  
void VerifyWindow(); P[r}(@0rJ  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) A89Y;_4y  
//{{AFX_MSG_MAP(CHookApp) E%KC'T N^D  
// NOTE - the ClassWizard will add and remove mapping macros here. 1"N/ZKF-x  
// DO NOT EDIT what you see in these blocks of generated code! 30:HRF(:  
//}}AFX_MSG_MAP 6!i( \Q*  
END_MESSAGE_MAP() lb=2*dFJ1  
h6K!|-Gq.  
CHookApp::CHookApp() k{!iDZr&f,  
{ s$eK66H  
 // TODO: add construction code here, kvY} yw7  
 // Place all significant initialization in InitInstance w`2_6[,9  
} ~r7DEy|+  
Z z{[Al{  
CHookApp theApp; )2   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Sf#\6X<B  
{ 1KNkl,E  
 BOOL bProcessed=FALSE; |Sy}d[VKsZ  
 if(HC_ACTION==nCode) +<vqkc  
 { )@?Qt2  
  if((lParam&0xc0000000)==0xc0000000){// Key up fLf#2EA  
   switch(wParam) jauc*347  
   { g#pIMA#/  
    case VK_MENU: +A;n*DF2  
     MaskBits&=~ALTBIT; ) >-D={  
     break; ,=x.aX Spz  
    case VK_CONTROL: ixoMccU0  
     MaskBits&=~CTRLBIT; $L $j KNwf  
     break; S+4I[|T]Y  
    case VK_SHIFT: Ta!m%=8  
     MaskBits&=~SHIFTBIT; >& 4I.nA  
     break; (Qw`%B  
    default: //judge the key and send message ~QQEHx\4zZ  
     break; exGhkt~  
   } +sV#Z,  
   for(int index=0;index<MAX_KEY;index++){ 4'7 v!I9  
    if(hCallWnd[index]==NULL) CYY X\^hA  
     continue; 7cJO)cm0'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C"V?yDy2~  
    { vgd}09y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); loAfFK>g  
     bProcessed=TRUE; (dw3'W  
    } hv_pb#1Ks  
   } g%KGF)+H  
  } 5G dY7t_1  
  else if((lParam&0xc000ffff)==1){ //Key down IDL^0:eg<.  
   switch(wParam) y'i:%n}I  
   { bF8xQ<i~Y  
    case VK_MENU: t(LlWd  
     MaskBits|=ALTBIT; ^$T!@ +:  
     break; .F=<r-0  
    case VK_CONTROL: MC[ `<W)u  
     MaskBits|=CTRLBIT; |R:v<  
     break; 3/#R9J#  
    case VK_SHIFT: <%5-Pzp  
     MaskBits|=SHIFTBIT; ` :B  
     break; D:S6Mu  
    default: //judge the key and send message j.G.Mx"  
     break; >8.v.;`  
   } hA&j?{  
   for(int index=0;index<MAX_KEY;index++) UGezo3}  
   { H_xQ>~b  
    if(hCallWnd[index]==NULL) a`GN@ 8  
     continue; E: LQ!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9|?(GG  
    { )SlUQ7f>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 071E%u,  
     bProcessed=TRUE; ._F 6-pl  
    } ft. }$8vIT  
   } Y~\`0?ST  
  } !Sr0Im0  
  if(!bProcessed){ , L AJ  
   for(int index=0;index<MAX_KEY;index++){ n+A'XBHk  
    if(hCallWnd[index]==NULL) !D|pbzQc8  
     continue; d~xU?)n)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) F"HI>t)>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); i32_ZBZ?y  
   } (Mire%$h  
  } '"G %0y  
 } WP#_qqO  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ""U?#<}GD  
} MSm`4lw  
HK,G8:T  
BOOL InitHotkey() p.W*j^';Q  
{ ^7^bA  
 if(hHook!=NULL){ 9^[5!SMzCj  
  nHookCount++; &>wce 5uV  
  return TRUE; dp%pbn6w  
 } G \aLg  
 else Z2pN<S{5  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); \w@_(4")Qb  
  if(hHook!=NULL) Rs( CrB/M  
   nHookCount++; | 9\7xT  
  return (hHook!=NULL); ZE3ysLk m  
} O+UV\  
BOOL UnInit() Eg- Mm4o  
{ eL$U M  
 if(nHookCount>1){ Kr}M>hF+|  
  nHookCount--; (^s&#_w03  
  return TRUE; %JA&O  
 } Lw+1|  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ws=9u-  
 if(unhooked==TRUE){ GVHfN5bTqn  
  nHookCount=0; +68K[s,FD  
  hHook=NULL; +hvIJv ?  
 } "!_ 4%z-  
 return unhooked; U(&nh ?  
} '|A5a+[  
xvz5\s|b  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ; K 6Fe)  
{ {ALBmSapK"  
 BOOL bAdded=FALSE; A%czhF  
 for(int index=0;index<MAX_KEY;index++){ yU8Y{o;:  
  if(hCallWnd[index]==0){ QmkC~kK1.  
   hCallWnd[index]=hWnd; 8UY=}R2C  
   HotKey[index]=cKey; pQ-^T.'  
   HotKeyMask[index]=cMask; LK-6z w5=(  
   bAdded=TRUE; kI[O{<kQ  
   KeyCount++; &#my #u^O;  
   break; "6o}qeB l  
  } V]PhXVJ  
 } R_*D7|v  
 return bAdded; 7[.Q.3FL  
} q?]@' ^:;  
<W[8k-yOV`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) sq6%=(q(?  
{ Sph"w08  
 BOOL bRemoved=FALSE; o_KcnVQ\  
 for(int index=0;index<MAX_KEY;index++){ )s7Tv#[  
  if(hCallWnd[index]==hWnd){ "drh+oo.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0gb]Kjx  
    hCallWnd[index]=NULL; P)j9\ muc  
    HotKey[index]=0; eYX_V6c  
    HotKeyMask[index]=0; ~m09yc d<  
    bRemoved=TRUE; V1b_z  
    KeyCount--; O> ^~SO  
    break; D>#v 6XI  
   } iYQy#kO  
  } YU0HySP:  
 } '<W,-i  
 return bRemoved; a=T7w;\h  
} 0}7Rm>  
jl0Eg  
void VerifyWindow() r-Xe<|w  
{ xS-nO_t 'E  
 for(int i=0;i<MAX_KEY;i++){ Nb9V/2c;V  
  if(hCallWnd!=NULL){ OVo  
   if(!IsWindow(hCallWnd)){ Jz3<yQ-  
    hCallWnd=NULL; x^#{2}4u  
    HotKey=0; PdN\0B `  
    HotKeyMask=0; a.U:B [v`  
    KeyCount--; Gv nclnG  
   } V7'x? pt  
  } r ~!%w(N|M  
 } D}/.;]w<[&  
} gx9sBkoq5D  
*]| JX&  
BOOL CHookApp::InitInstance() T2PFE4+Dp  
{ V5@[7ncVf  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ue:P#] tx  
 hins=AfxGetInstanceHandle(); vKOn7  
 InitHotkey(); -:p1gg&  
 return CWinApp::InitInstance(); +PXfr~ 4  
} 86 /i~s  
ieLN;)Iy^  
int CHookApp::ExitInstance() c&?H8G)x  
{ GZ[h`FJg/  
 VerifyWindow(); E=~WQ13Q  
 UnInit(); 4k?JxA)  
 return CWinApp::ExitInstance(); `lh?Z3W  
} K]*ERAfM%m  
lGBdQc]IL  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ITqigGan%  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) bme#G{[)Y  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ eKti+n.  
#if _MSC_VER > 1000 2DqHqq9m  
#pragma once SK}g(X7IWH  
#endif // _MSC_VER > 1000 kQ'xs%Fw  
? /X6x1PN  
class CCaptureDlg : public CDialog MC)W?  
{ Y +yvv{01  
 // Construction n.UM+2G  
 public: >#n-4NZ;p9  
  BOOL bTray; ZO6bG$y64  
  BOOL bRegistered; @z JZoJL]J  
  BOOL RegisterHotkey(); #_sVB~sn@  
  UCHAR cKey; E_uH' E  
  UCHAR cMask; n ZZQxV,  
  void DeleteIcon(); Z4 zMa&  
  void AddIcon(); G.ARu-2's  
  UINT nCount; 'wq:F?viF  
  void SaveBmp(); yf^gU*  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor eV+wnE?SB5  
  // Dialog Data g)6 k?Y  
  //{{AFX_DATA(CCaptureDlg) l hp:.  
  enum { IDD = IDD_CAPTURE_DIALOG }; $ rnr;V  
  CComboBox m_Key; q8v!{Os+#  
  BOOL m_bControl; Guc^gq}  
  BOOL m_bAlt; cDyC&}:f  
  BOOL m_bShift; J|8YB3K,  
  CString m_Path; N!&VBx^z  
  CString m_Number; zvC,([  
  //}}AFX_DATA "A`'~]/hE  
  // ClassWizard generated virtual function overrides :%]R x&08  
  //{{AFX_VIRTUAL(CCaptureDlg) uQ+$HzxX  
 public: 19`0)pzZ*P  
  virtual BOOL PreTranslateMessage(MSG* pMsg); JN-8\ L  
 protected: ' *C)S  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (\Zo"x;(  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); cU[pneY  
  //}}AFX_VIRTUAL ?S:_J!vX{  
  // Implementation Q</HFpE  
 protected: +%$V?y (  
  HICON m_hIcon; kakWXGeR  
  // Generated message map functions $gK>R5^G>  
  //{{AFX_MSG(CCaptureDlg) BQf+1 Ly&  
  virtual BOOL OnInitDialog(); w~?eX/;  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); r_RTtS#  
  afx_msg void OnPaint(); h!%`odl%  
  afx_msg HCURSOR OnQueryDragIcon(); , .F+x}  
  virtual void OnCancel(); t ?'/KL  
  afx_msg void OnAbout(); Gw,kC{:C  
  afx_msg void OnBrowse(); L<]P K4  
  afx_msg void OnChange(); e2ZUl` {g  
 //}}AFX_MSG L KR,CPz  
 DECLARE_MESSAGE_MAP() ,R6$SrNcd  
}; hG3Lj7)UH  
#endif F4gc_>{|  
!qve1H4d2  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file t4f\0`jN  
#include "stdafx.h" VO?NrKyeW  
#include "Capture.h" :?W:'% (`[  
#include "CaptureDlg.h" 8[IifF1M=&  
#include <windowsx.h> &" n9,$  
#pragma comment(lib,"hook.lib") SVz.d/3Y  
#ifdef _DEBUG }CqIKoX.  
#define new DEBUG_NEW zKT<QM!`  
#undef THIS_FILE 8}@a?QS(&  
static char THIS_FILE[] = __FILE__; -e\56%\~_  
#endif Vk T3_f  
#define IDM_SHELL WM_USER+1 ZA@"uqa6b  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); '2oBi6|X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); vLS6Gb't  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; dBn.DU*B  
class CAboutDlg : public CDialog `d#_66TLr  
{ +=$G6uR$  
 public: j'n= Xh  
  CAboutDlg(); n8,/olqwW  
  // Dialog Data QV1%Zou  
  //{{AFX_DATA(CAboutDlg) [}3Y1t{G  
  enum { IDD = IDD_ABOUTBOX }; .1}(Bywm5  
  //}}AFX_DATA ?! Gt. fb  
  // ClassWizard generated virtual function overrides 7|Y8^T s  
  //{{AFX_VIRTUAL(CAboutDlg)  t/(j8w  
 protected: )}5r s  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support b=EZtk6>  
  //}}AFX_VIRTUAL &T}e9 3]  
  // Implementation }$U6lh/Ep  
 protected: ]h@:Y]  
  //{{AFX_MSG(CAboutDlg) OSU=O  
  //}}AFX_MSG Q)&Ztw<  
  DECLARE_MESSAGE_MAP() 4ebGAg?_  
}; xy>mM"DOH  
<0}'#9>O  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) z0Hh8*  
{ 0l*/_;wo  
 //{{AFX_DATA_INIT(CAboutDlg) MLX.MUS  
 //}}AFX_DATA_INIT +M:Q!'  
} |05LHwb>  
@DR&e^Zz  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9hU@VPB~  
{ T94$}- 5/)  
 CDialog::DoDataExchange(pDX);  1qF.0  
 //{{AFX_DATA_MAP(CAboutDlg) XwMC/]lK<  
 //}}AFX_DATA_MAP d?.x./1[qi  
} R\?!r4  
ysPW<  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 24fWj?A|^  
 //{{AFX_MSG_MAP(CAboutDlg) v>R.ou(  
 // No message handlers o 8U2vMH  
 //}}AFX_MSG_MAP K.~U%v}  
END_MESSAGE_MAP() $4pW#4/4  
Vy $\.2=  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 50A_+f.7%  
: CDialog(CCaptureDlg::IDD, pParent) =|/b[Gd(  
{ )9O{4PbU!  
 //{{AFX_DATA_INIT(CCaptureDlg) g&V.o5jIhc  
  m_bControl = FALSE; uPPe"$  
  m_bAlt = FALSE; LtBH4 A  
  m_bShift = FALSE; Ql 1# l:Q  
  m_Path = _T("c:\\"); Mv3Ch'X[  
  m_Number = _T("0 picture captured."); @@QU"8q  
  nCount=0; <[bDNe["?  
  bRegistered=FALSE; I\_R& v  
  bTray=FALSE; ;z#9>99rH  
 //}}AFX_DATA_INIT {JJ`|*H$_  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 *(rE<  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); l{4\Wn Va  
} *?K=;$  
4=Zlsp  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) _1~Sj*  
{ ` {p5SYj  
 CDialog::DoDataExchange(pDX); &knnWm"  
 //{{AFX_DATA_MAP(CCaptureDlg) JQqDUd  
  DDX_Control(pDX, IDC_KEY, m_Key); frt?*|:  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); {T9g\F*  
  DDX_Check(pDX, IDC_ALT, m_bAlt); kMA>)\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); U Lq%,ca  
  DDX_Text(pDX, IDC_PATH, m_Path); jWz-7BO  
  DDX_Text(pDX, IDC_NUMBER, m_Number); \?Z dUY  
 //}}AFX_DATA_MAP JcP'+@X"  
} Jz6PqU|=  
7>'F=}6[Y  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) g=.5*'Xlp  
//{{AFX_MSG_MAP(CCaptureDlg) *HRRv.iQ  
 ON_WM_SYSCOMMAND() lMP7o&  
 ON_WM_PAINT() F-6* BUqJ  
 ON_WM_QUERYDRAGICON() @N$r'@  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) $W2AiE[Wm  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) k)J7) L  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 8"@<s?0\"  
//}}AFX_MSG_MAP &zR}jD>  
END_MESSAGE_MAP() >,v~,<3 i  
1NTe@r!y  
BOOL CCaptureDlg::OnInitDialog() y.Py>GJJ1S  
{ C{D2mSS  
 CDialog::OnInitDialog(); ?/\;K1c p  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); C"}x=cK  
 ASSERT(IDM_ABOUTBOX < 0xF000); xl3U  
 CMenu* pSysMenu = GetSystemMenu(FALSE); !l~hO  
 if (pSysMenu != NULL) z}%to0W  
 { 8Xr3q eh+  
  CString strAboutMenu; K;95M^C\O*  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ;u%hwlo  
  if (!strAboutMenu.IsEmpty()) )q,}jeM8  
  { :/3`+&T^/  
   pSysMenu->AppendMenu(MF_SEPARATOR); v#6.VUAw  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); M3''xrpC  
  } |lv4X }H  
 } >@X=E3  
 SetIcon(m_hIcon, TRUE); // Set big icon cA*%K[9  
 SetIcon(m_hIcon, FALSE); // Set small icon {MS&t09Wh  
 m_Key.SetCurSel(0); P+/L, u  
 RegisterHotkey(); gSC@uf  
 CMenu* pMenu=GetSystemMenu(FALSE); Pzqgg43Xf  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); kU /?#s  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 1ysA~2  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); buoz La  
 return TRUE; // return TRUE unless you set the focus to a control .q=X58tHu  
} b7n~z1$  
`XnFc*L 1  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) } 8svd#S+  
{ oTL "]3`'  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,uw &)A  
 { ka hv1s-  
  CAboutDlg dlgAbout; ?z6C8T~+  
  dlgAbout.DoModal(); \bg^E>-  
 } %tMfOW  
 else IH0Uq_  
 { @.0,k a,X  
  CDialog::OnSysCommand(nID, lParam); x\=h^r#w  
 } myo/}58Nv  
} )-9/5Z0v  
[kXe)dMX8  
void CCaptureDlg::OnPaint() =FE,G*  
{ $$4% .J26Z  
 if (IsIconic()) kO4C^pl"v  
 { 4 qnQF]4  
  CPaintDC dc(this); // device context for painting ]u:NE'0Xy  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 5u&jNU5m_  
  // Center icon in client rectangle mB\5bSFY`  
  int cxIcon = GetSystemMetrics(SM_CXICON); u,C-U!A  
  int cyIcon = GetSystemMetrics(SM_CYICON); b&ADj8cKC  
  CRect rect; vH=I#Ajar  
  GetClientRect(&rect); G$Dg*<  
  int x = (rect.Width() - cxIcon + 1) / 2; +X< Z 43  
  int y = (rect.Height() - cyIcon + 1) / 2; }"T:z{n  
  // Draw the icon a-W&/  
  dc.DrawIcon(x, y, m_hIcon); 2vwT8/  
 } Ii9vA ^53  
 else O~D}&M@/R  
 { 6hZhD1lDG^  
  CDialog::OnPaint(); #<JrSl62(K  
 } G{J9Fb8  
} QEVjXJOt0  
R =jK3yfw  
HCURSOR CCaptureDlg::OnQueryDragIcon() AkF1Hj  
{ %8ul}}d9  
 return (HCURSOR) m_hIcon; |`|b&Rhu  
} ; R67a V,  
0QPipuP  
void CCaptureDlg::OnCancel() o%dtf5}(,  
{ >ko;CQR  
 if(bTray) ."lY>(HJ  
  DeleteIcon(); ED6H  
  CDialog::OnCancel(); Q.N^1?(>k  
} WgIVhj  
a}fW3+>  
void CCaptureDlg::OnAbout() <sTa Xaq?  
{ T4UY%E!0  
 CAboutDlg dlg; g5cR.]oz  
 dlg.DoModal(); b/ynCf8X  
} !=-l760  
bNC1[GG[  
void CCaptureDlg::OnBrowse() 9Hu%Z/[!p  
{ 0+L5k!1D  
 CString str; FrVD~;  
 BROWSEINFO bi; d<whb2l  
 char name[MAX_PATH]; V +hV&|=  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); J@$>d  
 bi.hwndOwner=GetSafeHwnd(); uIR_p \)  
 bi.pszDisplayName=name; X@cV']#V  
 bi.lpszTitle="Select folder"; mF_/Rhu  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; $q+7 ,,"  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); snK/,lm.  
 if(idl==NULL) $Fn# b|e  
  return; 8xNKVj)@  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); mr;WxxO5  
 str.ReleaseBuffer(); A[b'MNsv  
 m_Path=str; x&f?c=\F  
 if(str.GetAt(str.GetLength()-1)!='\\') > 1r>cZn  
  m_Path+="\\"; E/am^ TO`  
 UpdateData(FALSE); ,^'Y7"  
} 5/(Dh![l  
v\<`"  
void CCaptureDlg::SaveBmp() "XH]B  
{ TEYbB=.  
 CDC dc; gC'GZi^  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 2n@"|\uHD  
 CBitmap bm; o~~_>V)W  
 int Width=GetSystemMetrics(SM_CXSCREEN); 5?Bi+fg  
 int Height=GetSystemMetrics(SM_CYSCREEN); fpzTv3D=I  
 bm.CreateCompatibleBitmap(&dc,Width,Height); L'c4 i[~s  
 CDC tdc; & z?y  
 tdc.CreateCompatibleDC(&dc); { u;ntDr  
 CBitmap*pOld=tdc.SelectObject(&bm); 3(CUC  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); X4o8  
 tdc.SelectObject(pOld);  l[ L{m7  
 BITMAP btm; i#C?&  
 bm.GetBitmap(&btm); 6=zme6D  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; IX3r$}4  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); h\yYg'CC  
 BITMAPINFOHEADER bih; . E.OBn  
 bih.biBitCount=btm.bmBitsPixel; h rZ\ O?j  
 bih.biClrImportant=0; ;mMn-+3<  
 bih.biClrUsed=0; C|>#|5XaF  
 bih.biCompression=0; %xY'v$ %  
 bih.biHeight=btm.bmHeight; oc15!M3$  
 bih.biPlanes=1; _{A($/~c?  
 bih.biSize=sizeof(BITMAPINFOHEADER); UH)A n:9  
 bih.biSizeImage=size; Z(V 4"x7F  
 bih.biWidth=btm.bmWidth; pIh@!C  
 bih.biXPelsPerMeter=0; }wiq?dr  
 bih.biYPelsPerMeter=0; BKGwi2]Ry  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ){6;o& CC:  
 static int filecount=0; T$+}Srb  
 CString name; kQj8;LU  
 name.Format("pict%04d.bmp",filecount++); H6~QSe0l  
 name=m_Path+name; alq>|,\x  
 BITMAPFILEHEADER bfh; I5-/K VWb  
 bfh.bfReserved1=bfh.bfReserved2=0; 3fGy  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ?.4u'Dkn=  
 bfh.bfSize=54+size; O /GD[9$i  
 bfh.bfOffBits=54; #$A6s~`B  
 CFile bf; D7=gUm >  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 94n,13  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); {Xl 5F.q  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); lD{9o2  
  bf.WriteHuge(lpData,size); )`L!eN  
  bf.Close();  Z3I<  
  nCount++; &3AGj,  
 } /at#[Pw~01  
 GlobalFreePtr(lpData); }U8H4B~UtY  
 if(nCount==1) +pDuRr  
  m_Number.Format("%d picture captured.",nCount); XX/cJp  
 else {gJOc,U4b  
  m_Number.Format("%d pictures captured.",nCount); 2Qn%p[#n  
  UpdateData(FALSE); `B^?Za,xN  
} VD1*br^,  
KC  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ^^v\ T  
{ "F0,S~tZZ  
 if(pMsg -> message == WM_KEYDOWN) hLBX,r)u  
 { VNPuOU=  
  if(pMsg -> wParam == VK_ESCAPE) d/|@"z^?  
   return TRUE; ] Li(E:  
  if(pMsg -> wParam == VK_RETURN) N<?RN;M  
   return TRUE; 5 1 L:%Af  
 } br0gB3 r  
 return CDialog::PreTranslateMessage(pMsg); {lqnn n3  
} \b' <q  
q~a6ES_lA  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &ts!D!Hj  
{ S c@g;+#QU  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ }<XeZ?;  
  SaveBmp(); }n8,Ga%  
  return FALSE; ^gNAGQYA  
} |JrG?:n  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Z>o20uA  
 CMenu pop; TlM ]d;9G  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4,uH 4[7  
 CMenu*pMenu=pop.GetSubMenu(0); \+ K ^G  
 pMenu->SetDefaultItem(ID_EXITICON); g{dyDN$5|w  
 CPoint pt; <~f/T]E,  
 GetCursorPos(&pt); 2<<,aL*  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); YsLEbue   
 if(id==ID_EXITICON) #K  ]k  
  DeleteIcon(); [<bfwTFsl  
 else if(id==ID_EXIT) 3vmZB2QG  
  OnCancel(); MTa.Ubs  
 return FALSE; _ 57m] ;&  
} Y]ZOvA5W  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); '%)7%O,2  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) cl^tX%  
 AddIcon(); c6Wy1d^  
 return res; ZSHc@r*>  
} 17J|g.]m-&  
o^gqpQv  
void CCaptureDlg::AddIcon() aQkgkV;~  
{ CkIICx  
 NOTIFYICONDATA data; KeY)%{  
 data.cbSize=sizeof(NOTIFYICONDATA); Nqy',N  
 CString tip; nz+DPk["  
 tip.LoadString(IDS_ICONTIP); O'o`  
 data.hIcon=GetIcon(0); QIG MP=!j  
 data.hWnd=GetSafeHwnd(); iv\?TAZC  
 strcpy(data.szTip,tip); =XyK/$  
 data.uCallbackMessage=IDM_SHELL; fMd]P:B  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; dxxD%lHCF  
 data.uID=98; G^oBu^bq~  
 Shell_NotifyIcon(NIM_ADD,&data); Xv6z>z.  
 ShowWindow(SW_HIDE); = R; 0Ed&b  
 bTray=TRUE; 8!E$0^)c|  
} `[7&tOvSk  
X,^J3Ek>O  
void CCaptureDlg::DeleteIcon() i3N _wv{  
{ rAk*~OK  
 NOTIFYICONDATA data; ' ^n2]<  
 data.cbSize=sizeof(NOTIFYICONDATA); ^uC1\!Q1  
 data.hWnd=GetSafeHwnd(); n omtP }  
 data.uID=98; 7G!SlC X}W  
 Shell_NotifyIcon(NIM_DELETE,&data); $d4eGL2S  
 ShowWindow(SW_SHOW); ^[lg1uMW  
 SetForegroundWindow(); _q M'm^z5  
 ShowWindow(SW_SHOWNORMAL); N%n#mV;  
 bTray=FALSE; 8gr&{-5  
} 5fM/y3QPsZ  
X 1^f0\k  
void CCaptureDlg::OnChange() l 8n#sGA%  
{ ]g!k'@  
 RegisterHotkey(); QV7K~qi  
} RCnN+b:c  
,RDxu7iT  
BOOL CCaptureDlg::RegisterHotkey() t k2B\}6  
{ H+\rCefba  
 UpdateData(); d8/lEmv[  
 UCHAR mask=0; ^`Vt<DMT  
 UCHAR key=0; ~1i,R1_\Y  
 if(m_bControl) >O|hN`  
  mask|=4; 6D6=5!l  
 if(m_bAlt) 0X~Dxs   
  mask|=2; !JJCG  
 if(m_bShift) F[ m^(x  
  mask|=1; i8+kc_8#d  
  key=Key_Table[m_Key.GetCurSel()]; u3w `(3{ <  
 if(bRegistered){ :/K 'P`JaL  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Ds$FO}KD{  
  bRegistered=FALSE; }|&M@Up  
 } +|r) ;>b  
 cMask=mask; n!A')]y"  
 cKey=key; v6;XxBR6  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); e#)}.   
 return bRegistered; 1DN,  
} qdjRw#LS^q  
m>jX4D7KZ  
  四、小结 {.DI[@.g  
&X9#{:l=  
  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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