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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: 4qe!+!#$  
  KBSO^<7  
  一、实现方法 d|Q_Z@;JF  
530Z>q  
  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: !W?6,i-]  
=bDy :yY}  
#pragma data_seg("shareddata") [t.x cO  
HHOOK hHook =NULL; //钩子句柄 4y$tp1 8  
UINT nHookCount =0; //挂接的程序数目 PY{])z3N  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 !b:;O +[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 cZd{K[fuK  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey /ltGSl  
static int KeyCount =0;  jcVK4jW  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 N sNk  
#pragma data_seg() v$_YZm{!<  
:^H#i:4  
  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。 c(5r  
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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: <~ 9a3c?  
nPh| rW=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ER4j=O#  
cKey,UCHAR cMask) `:&jbd4H  
{ B^yA+&3HI  
 BOOL bAdded=FALSE; Cg4l*"_  
 for(int index=0;index<MAX_KEY;index++){ }US^GEs(  
  if(hCallWnd[index]==0){ "PhP1;A9,  
   hCallWnd[index]=hWnd; xfsf  
   HotKey[index]=cKey; kH9P(`;Vq  
   HotKeyMask[index]=cMask; .*_uXQ  
   bAdded=TRUE; B!X;T9^d  
   KeyCount++; p.50BcDg  
   break; 2zQ62t}  
  } V\4zK$]  
 } `L#`WC@[o  
 return bAdded; !`$xN~_  
} [ _N w5_  
//删除热键 gdKn!; ,w#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) } 63Qh}_Y  
{ QW[ gDc  
 BOOL bRemoved=FALSE; I&lb5'6D  
 for(int index=0;index<MAX_KEY;index++){ ^w1&A 3=6  
  if(hCallWnd[index]==hWnd){ `of` uB  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;5TQH_g  
    hCallWnd[index]=NULL; m(6SiV=D9  
    HotKey[index]=0; ?9I=XTR  
    HotKeyMask[index]=0; c"H59 jE  
    bRemoved=TRUE; 8a}et8df:  
    KeyCount--; !da [#zK  
    break; ']]5xH*U  
   } sH_5.+,`  
  } Z&w/JP?  
 } ` <3xi9  
 return bRemoved; L2GUrf  
} n +R3  
M}c gVMW  
A.@/~\  
  DLL中的钩子函数如下: yR|Beno  
Mb0l*'ZF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) YrRD3P.P  
{ 7F!(60xY  
 BOOL bProcessed=FALSE; l]wjH5mz=i  
 if(HC_ACTION==nCode) 2qQG  
 { n9p_D  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 W7 iml|WV0  
   switch(wParam) g4"0:^/  
   {   |)'6U3  
    case VK_MENU: =}h8Cl{H/  
     MaskBits&=~ALTBIT; Q3OGU}F  
     break; w,/&oe5M+  
    case VK_CONTROL: E` O@UW@  
     MaskBits&=~CTRLBIT; 9]E;en NQ  
     break; vy&< O  
    case VK_SHIFT: H,I k&{@j  
     MaskBits&=~SHIFTBIT; F[HMX4  
     break; yCt,-mz!z  
    default: //judge the key and send message RD1N@sHDKc  
     break; o fw0_)!Q  
   } U0Q:sA U  
   for(int index=0;index<MAX_KEY;index++){ : U:>X6f  
    if(hCallWnd[index]==NULL) q[rBu9  
     continue; `~ ,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 14LOeo5O  
    { eq<giHJM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); P}dhpU  
     bProcessed=TRUE; %%-hax.x0X  
    } h0v4!`PQ-  
   } XC NM  
  } ]z{f)`;I  
  else if((lParam&0xc000ffff)==1){ //有键按下 AR}q<k6E  
   switch(wParam) /-_<RQ  
   { D6wg^ 'Q:  
    case VK_MENU: h9J%NH  
     MaskBits|=ALTBIT; Ny oRp  
     break; F9Y/Z5 Ea  
    case VK_CONTROL: h%0hryGB  
     MaskBits|=CTRLBIT; D6M ktE)'  
     break; .&R j2d  
    case VK_SHIFT: }% m:^*@$9  
     MaskBits|=SHIFTBIT; gOnVN6  
     break; L4wKG&  
    default: //judge the key and send message %?`TyVt&0  
     break; `tZ-8f  
   } _t+.I9kQ  
   for(int index=0;index<MAX_KEY;index++){ "h>B`S  
    if(hCallWnd[index]==NULL) `VB]4i}u  
     continue; =5PNH2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f-M9OI  
    { D. _*p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); iCK p"(kf  
     bProcessed=TRUE; >AsrPU[  
    } 9~FB^3Nz_  
   } [p7cgHSMt  
  } e,0y+~  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 .JG>/+  
   for(int index=0;index<MAX_KEY;index++){ FSp57W$  
    if(hCallWnd[index]==NULL) eC71;"  
     continue; m:{ws~   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @}Y,A~   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *;]j#0  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 pjI< cQ&  
   } Fo0dz  
  } /6$8djw  
 } `!t+sX- n  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); v o9Fj  
} O_n) 2t(c?  
acXB vs  
  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: No1*~EQ  
MK*WStY  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^71!.b%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /1Q i9uit  
VXpbmg!{S  
  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: P%-@AmO^_  
)w.\xA~|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) k~<b~VcU  
{ /M.@dW7 w  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) p%_m!   
 { { 4(E @  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 f-!A4eKe  
  SaveBmp(); $Bd13%>)  
  return FALSE; ?uq7K"B  
 } Wg3\hv29  
 …… //其它处理及默认处理 q')MKR*  
} 6tKm'`^z4  
x-Cy,d:YX  
l_Ffbs_6t  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 qBkI9H  
t mCm54  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ~|7jz;$V  
99<0xN(25  
  二、编程步骤 m)]A$*`<  
~BSE8M+r  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; w=r3QKm#K  
lQnl6j  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; cjd Z.jR2  
ylEQeN  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; DKcg  
\8I>^4t'/  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; C9`J6Uu  
@y#QHJ.j  
  5、 添加代码,编译运行程序。  ?Cu1"bl  
Hvm+Tr2@  
三、程序代码 :n4X>YL)  
:4ndU:.L  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL  3e<FlH{  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) FzDZ<dJ  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ *i}Nb* Z3  
#if _MSC_VER > 1000 D9#?l <D  
#pragma once r dc} e"v  
#endif // _MSC_VER > 1000 Q|^TR__  
#ifndef __AFXWIN_H__ 7d7"^M  
#error include 'stdafx.h' before including this file for PCH 1b6o x6  
#endif nmLn]U=  
#include "resource.h" // main symbols 5K~kzR L$r  
class CHookApp : public CWinApp |Bv?! sjf  
{ yWs_Z6b  
 public: ~"Pu6-\VT  
  CHookApp(); e@-"B9~   
  // Overrides ~B NLzt3%O  
  // ClassWizard generated virtual function overrides ?Q~6\xA  
  //{{AFX_VIRTUAL(CHookApp) Pmj]"7Vd[  
 public: BZXP%{njS  
  virtual BOOL InitInstance(); #b~wIOR)Z  
  virtual int ExitInstance(); Llf |fayq  
  //}}AFX_VIRTUAL ed,w-;(n~  
  //{{AFX_MSG(CHookApp) >@2l/x8;  
  // NOTE - the ClassWizard will add and remove member functions here. Dn 6k,nVh  
  // DO NOT EDIT what you see in these blocks of generated code ! `o9vE0^T<  
  //}}AFX_MSG W.xlS ZEB  
  DECLARE_MESSAGE_MAP() F^ m`j6  
}; V7zF5=w  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); m]bv2S+5y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +&W%]KEh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m"2KAq61  
BOOL InitHotkey(); FyZa1%Tv@  
BOOL UnInit(); k \|[=  
#endif H$:Z`CQt<  
zS@"ITy  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. $GzTDq Y9@  
#include "stdafx.h" KPGX/l  
#include "hook.h" `Z3Qx~f x  
#include <windowsx.h> CvCk#:@HM  
#ifdef _DEBUG Cmq.V@  
#define new DEBUG_NEW YU89m7cc'  
#undef THIS_FILE {[~ !6&2(k  
static char THIS_FILE[] = __FILE__; +fgF &.  
#endif X7I"WC1ncz  
#define MAX_KEY 100 <p48?+K9  
#define CTRLBIT 0x04 ~zklrBn&  
#define ALTBIT 0x02 +\`D1d@  
#define SHIFTBIT 0x01 UF[2Rb8?  
#pragma data_seg("shareddata") sckyG  
HHOOK hHook =NULL; KfU4#2}  
UINT nHookCount =0; (c /H$'  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey vrtK~5K  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT %$b)l? !  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey "t<$ {  
static int KeyCount =0; @j%r6N  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \dyJ=tg  
#pragma data_seg() _E e`Uk  
HINSTANCE hins; {gE19J3  
void VerifyWindow(); *t;'I -1w^  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) s!\uR.  
//{{AFX_MSG_MAP(CHookApp) U _~lpu  
// NOTE - the ClassWizard will add and remove mapping macros here. 73$^y)AvY  
// DO NOT EDIT what you see in these blocks of generated code! YfC1.8  
//}}AFX_MSG_MAP P@Wi^svj  
END_MESSAGE_MAP() UTEUVcJ\  
w_po5[]R  
CHookApp::CHookApp() |kvom 4T  
{ }]pq&v!  
 // TODO: add construction code here, "_qH+ =_R  
 // Place all significant initialization in InitInstance wVvk{tS  
} pV:c`1\`  
d}K"dr:W5  
CHookApp theApp; &qki NS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Z!TLWX "  
{ :t\pi. uWt  
 BOOL bProcessed=FALSE; K~A$>0c  
 if(HC_ACTION==nCode) "5mdq-h(  
 { eRC /Pr  
  if((lParam&0xc0000000)==0xc0000000){// Key up VGoD2,(b^  
   switch(wParam) #>-_z  
   { A KO#$OJE  
    case VK_MENU: n*6b*fl  
     MaskBits&=~ALTBIT; \UI7H1XDH  
     break; ] X,C9  
    case VK_CONTROL: }/ 6Q3B  
     MaskBits&=~CTRLBIT; ]HP aM  
     break; 1FU(j*~:  
    case VK_SHIFT: 0>Y3>vwSl  
     MaskBits&=~SHIFTBIT; &pS <4  
     break; uBLI!N-G  
    default: //judge the key and send message   5;+OpB  
     break; B\a-Q,Wf  
   } & ?mH[rG"  
   for(int index=0;index<MAX_KEY;index++){ BN&^$1F((  
    if(hCallWnd[index]==NULL) zbdmz  
     continue; #C1u~db  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }EmNSs`$r  
    { 6P=6E   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); gc-yUH0I  
     bProcessed=TRUE; #%U5,[<a8  
    } -W(O~AK  
   } )s6pOxWx  
  } n?*Fr sZ  
  else if((lParam&0xc000ffff)==1){ //Key down "nX L7N0  
   switch(wParam) MXY[t  
   { d\}r.pD  
    case VK_MENU: 'qS&7 W(  
     MaskBits|=ALTBIT; 3]BK*OqJ  
     break; XVjs0/5b  
    case VK_CONTROL: '~ RP+  
     MaskBits|=CTRLBIT; K &m`1f  
     break; umrfA  
    case VK_SHIFT: &wsxH4  
     MaskBits|=SHIFTBIT; Q=lQy  
     break; q]3bGO;  
    default: //judge the key and send message ^9zL[R  
     break; C-/<5D j  
   } 1BK-uv:  
   for(int index=0;index<MAX_KEY;index++) ^ZX71-  
   { OosxuAC(  
    if(hCallWnd[index]==NULL) mG2*s ^$  
     continue; J[rpMQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <zE,T@c  
    { >K$9 (  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); won;tO]\;@  
     bProcessed=TRUE; m @) ~.E  
    } b: UTq 7^  
   } [(U:1&x &  
  } X>^St&B}fC  
  if(!bProcessed){ H%`Ja('"p  
   for(int index=0;index<MAX_KEY;index++){ ;^nN!KDjR  
    if(hCallWnd[index]==NULL) /k3v\Jq{  
     continue; F$P8"q+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) BtS#I[-p_  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5q<AMg  
   } Lu!o!>b  
  } X(Gp3lG  
 } :,03)[u{8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &U%AVD[  
} ?s[ kUv+=  
?zW4|0  
BOOL InitHotkey() Vo^ i7  
{ Pu dIb|V2  
 if(hHook!=NULL){ ,h,DB=!K<  
  nHookCount++; /1ZRjf^  
  return TRUE; cl kL)7RQ  
 } VWqmqR%  
 else .}Va~[0j  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 9~i=Af@  
  if(hHook!=NULL) Jhdo#}Ub  
   nHookCount++; R7u&`  
  return (hHook!=NULL); hw/ :  
} Vvk1 D(  
BOOL UnInit() F)_zR  
{ {2Jo|z  
 if(nHookCount>1){ 555j@  
  nHookCount--; NO5\|.,Z  
  return TRUE; ?5(Cwy ?  
 } z+IBy+  
 BOOL unhooked = UnhookWindowsHookEx(hHook); w.w(*5[  
 if(unhooked==TRUE){ b_2bg>|;  
  nHookCount=0; gE$D#PZa  
  hHook=NULL; 4X tIMa28  
 } g{wOq{7V  
 return unhooked; |P!7T.  
} &Z!O   
yClX!OL  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q!7il<S  
{ A)"?GK{*  
 BOOL bAdded=FALSE; +?r,Nn  
 for(int index=0;index<MAX_KEY;index++){ PhTMXv<cE  
  if(hCallWnd[index]==0){ J?VMQTa/+  
   hCallWnd[index]=hWnd; 5Fa.X|R~  
   HotKey[index]=cKey; Fq\vFt|m<  
   HotKeyMask[index]=cMask; o9I=zAGjy  
   bAdded=TRUE; Yxik .S+G  
   KeyCount++; 2wR?ON=Q  
   break; 5=Cea  
  } )5n*4A  
 } V0 70oZ  
 return bAdded; BN??3F8C  
} i+rh&,  
GH ] c  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [t #xX59  
{ 8NCu;s  
 BOOL bRemoved=FALSE; !R@v\Eu  
 for(int index=0;index<MAX_KEY;index++){ (55k70>i3  
  if(hCallWnd[index]==hWnd){ WbF[4 x  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6! `^}4  
    hCallWnd[index]=NULL; #Bu W  
    HotKey[index]=0; h=:Ls]ZU  
    HotKeyMask[index]=0; .d mUh-  
    bRemoved=TRUE; o@T-kAEf-.  
    KeyCount--; b ]A9$-  
    break; @`"U D  
   } a}(xZ\n^D;  
  } cV8Bl="gqe  
 } O^/z7,  
 return bRemoved; p1}umDb%  
} rjk{9u1a"  
u*n%cXY;J/  
void VerifyWindow() ;5S'?fj  
{ $W}YXLFj?  
 for(int i=0;i<MAX_KEY;i++){ BF)!VnJ  
  if(hCallWnd!=NULL){ VY9o}J>,w  
   if(!IsWindow(hCallWnd)){ #Y|t,x;  
    hCallWnd=NULL; Z'hHXSXM  
    HotKey=0; !q]@/<=  
    HotKeyMask=0; {,;R\)8D  
    KeyCount--; 2Kg-ZDK8  
   } p;nRxi7'  
  } nulLK28q  
 } 3 UXaA;  
} 7 LotN6H  
^:hI bF4G  
BOOL CHookApp::InitInstance() $W_sIS0\z  
{ OoIs'S-Z#  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4$W}6 v  
 hins=AfxGetInstanceHandle(); .|?UqZ(,  
 InitHotkey(); W"3YA+qpI  
 return CWinApp::InitInstance(); u7>{#]  
} k`aHG8S\  
#E`wqI\'  
int CHookApp::ExitInstance() Ec3TY<mVr  
{ #!yW)RG  
 VerifyWindow(); ;q5.\m:  
 UnInit(); pDYcsC{p  
 return CWinApp::ExitInstance(); rf\/Y"D  
} I \Luw*:  
.I h'&  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file CpGy'Ia  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) "@s</HGo  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ :<QmG3F  
#if _MSC_VER > 1000 a8w/#!^34  
#pragma once "A9qC*6[  
#endif // _MSC_VER > 1000 Pl/}`H:R&  
sa?Ul)L2  
class CCaptureDlg : public CDialog >U7{EfUJdx  
{ 2=]Xe#5J=  
 // Construction [H4)p ,R  
 public: q$iGeE#  
  BOOL bTray; tDWoQ&z2t_  
  BOOL bRegistered; P >>VBh?  
  BOOL RegisterHotkey(); qT153dNA&  
  UCHAR cKey; ?GT,Y5  
  UCHAR cMask; b f j]Q  
  void DeleteIcon(); V'M#."Of/  
  void AddIcon(); OyG#  
  UINT nCount; *4 HogC  
  void SaveBmp(); n.l7V<1  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor pu OAt  
  // Dialog Data ` zoC++hx  
  //{{AFX_DATA(CCaptureDlg) _Dq, \}  
  enum { IDD = IDD_CAPTURE_DIALOG }; Oaj$Z- f  
  CComboBox m_Key; /:GeXDJw  
  BOOL m_bControl; jt?DogYx  
  BOOL m_bAlt; bmP2nD6  
  BOOL m_bShift; O[<YYL 0  
  CString m_Path; Ne b")  
  CString m_Number; [sc4ULS &  
  //}}AFX_DATA {kOTQG?y  
  // ClassWizard generated virtual function overrides 8M6wc394  
  //{{AFX_VIRTUAL(CCaptureDlg) o=)["V  
 public: <FofRFaS  
  virtual BOOL PreTranslateMessage(MSG* pMsg); uXuA4o$t-  
 protected: N~! G AaD  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support sZh| <2  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); D/oO@;`'c  
  //}}AFX_VIRTUAL !;%+1j?d  
  // Implementation #+ai G52+  
 protected: /RBIZ_  
  HICON m_hIcon; E``\Jre@  
  // Generated message map functions w f""=;  
  //{{AFX_MSG(CCaptureDlg) \ $Q?  
  virtual BOOL OnInitDialog(); 5sZqX.XVF  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); vxZ :l  
  afx_msg void OnPaint(); }}X<e  
  afx_msg HCURSOR OnQueryDragIcon(); N@x5h8  
  virtual void OnCancel(); /cC4K\M  
  afx_msg void OnAbout(); N= G!r  
  afx_msg void OnBrowse(); ., =\/ C<  
  afx_msg void OnChange(); c2~oPUj  
 //}}AFX_MSG [kKg?I$D@B  
 DECLARE_MESSAGE_MAP() H[[#h=r0f  
}; I7]qTS[vg  
#endif L7"B`oa(p  
^@f-Ni\  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file :=oIvSnh  
#include "stdafx.h" L)QAI5o:3  
#include "Capture.h" IfzW%UL  
#include "CaptureDlg.h" =@*P})w5.  
#include <windowsx.h> Eoh{+>:6  
#pragma comment(lib,"hook.lib") g!I0UAm  
#ifdef _DEBUG OhiY <  
#define new DEBUG_NEW iPK:gK3Q  
#undef THIS_FILE !.c no&  
static char THIS_FILE[] = __FILE__; &]S\GnqlU]  
#endif j<PpCL_8%  
#define IDM_SHELL WM_USER+1 YgR}y+q^6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !V27ln KP+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); DTN)#G CtF  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; f\X7h6k8{  
class CAboutDlg : public CDialog $Ma*qEB  
{ X*< !_3  
 public: r}M2t$nv  
  CAboutDlg(); 9?I?;l{  
  // Dialog Data k`=&m"&#  
  //{{AFX_DATA(CAboutDlg) bZCNW$C3l  
  enum { IDD = IDD_ABOUTBOX }; ZRn!z`.0  
  //}}AFX_DATA f5P@PG]{  
  // ClassWizard generated virtual function overrides 9iM[3uyO  
  //{{AFX_VIRTUAL(CAboutDlg) w\%AR1,rs  
 protected: ;.I,R NM  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support lnWs cb3t  
  //}}AFX_VIRTUAL =y]F cxF  
  // Implementation !f01.Tq8  
 protected: gxCl=\  
  //{{AFX_MSG(CAboutDlg) W.7XShwd*2  
  //}}AFX_MSG il~A(`+YO  
  DECLARE_MESSAGE_MAP() Jl-:@[;  
}; 2@>#?c7  
LB/1To  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) )~C+nb '6/  
{ It8s#oq8  
 //{{AFX_DATA_INIT(CAboutDlg) -`ss7j&b3  
 //}}AFX_DATA_INIT Co^GsUJ  
} 0I7 r{T  
-:|t^RM;FT  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) I`uOsZBO/  
{ _5H0<%\  
 CDialog::DoDataExchange(pDX); UE 1tm  
 //{{AFX_DATA_MAP(CAboutDlg) !~-@p?kW/  
 //}}AFX_DATA_MAP 4%>2 >5  
} v O@7o  
CH] +S>$  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) gT#hF]c:  
 //{{AFX_MSG_MAP(CAboutDlg) _Eus7  
 // No message handlers xi}3)5  
 //}}AFX_MSG_MAP OY,iz  
END_MESSAGE_MAP() >slGicZ0  
IP+.L]S  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) *DuP~8  
: CDialog(CCaptureDlg::IDD, pParent) (3QG  
{ ';KZ.D  
 //{{AFX_DATA_INIT(CCaptureDlg) 7"p%c`*;  
  m_bControl = FALSE; <>R\lPI2  
  m_bAlt = FALSE; 66l+cb  
  m_bShift = FALSE; }]+k  
  m_Path = _T("c:\\"); NflRNu:-  
  m_Number = _T("0 picture captured."); 9PWqoz2c  
  nCount=0; 2SJ|$VsLaE  
  bRegistered=FALSE; `FRdo  
  bTray=FALSE; arb'.:[z^  
 //}}AFX_DATA_INIT !b?`TUt   
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 6rh^?B  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); H57wzG{xG  
} `8b4P>';O'  
n|) JhXQ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) p#>d1R1&  
{ ,`U'q|b  
 CDialog::DoDataExchange(pDX); s/0~!0  
 //{{AFX_DATA_MAP(CCaptureDlg) &e;GoJ  
  DDX_Control(pDX, IDC_KEY, m_Key); 8=WX`*-uH  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); UsnIx54D3  
  DDX_Check(pDX, IDC_ALT, m_bAlt); de,4M s!%  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); fea4Ul{ib  
  DDX_Text(pDX, IDC_PATH, m_Path); A*TO0L  
  DDX_Text(pDX, IDC_NUMBER, m_Number); e<duD W$X  
 //}}AFX_DATA_MAP r%vO^8FQ  
} qqr]S^WW  
gF~#M1!!  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) vhL/L?NB$  
//{{AFX_MSG_MAP(CCaptureDlg) L /V;;  
 ON_WM_SYSCOMMAND() 04@?Jb1*  
 ON_WM_PAINT() Zz^!QlF  
 ON_WM_QUERYDRAGICON() `+5,=S  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) VZCCMh-  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) K yDPD'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) yN9setw*,M  
//}}AFX_MSG_MAP a"whg~  
END_MESSAGE_MAP() e8VtKVcY  
gbjql+Mx+  
BOOL CCaptureDlg::OnInitDialog() |s, Add:S  
{ j[Oh>yG  
 CDialog::OnInitDialog(); /<)kI(gf  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Mo0pN\A}h  
 ASSERT(IDM_ABOUTBOX < 0xF000); ` l}+BI`4  
 CMenu* pSysMenu = GetSystemMenu(FALSE); BB3wG*q  
 if (pSysMenu != NULL) <iN xtD0  
 { \) vI-  
  CString strAboutMenu; ;)'  
  strAboutMenu.LoadString(IDS_ABOUTBOX); }J(o!2.  
  if (!strAboutMenu.IsEmpty()) 9y`Vg  
  { CkEbSa<)hK  
   pSysMenu->AppendMenu(MF_SEPARATOR); r"=6s/q7  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); lvk r2Meu<  
  } fe+2U|y  
 } 7R=A]@  
 SetIcon(m_hIcon, TRUE); // Set big icon m!^z{S  
 SetIcon(m_hIcon, FALSE); // Set small icon qExmf%q:q  
 m_Key.SetCurSel(0); dobqYd4`  
 RegisterHotkey(); !z |a+{  
 CMenu* pMenu=GetSystemMenu(FALSE); k?qd -_sC  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); T}y@ a^#  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); {O (@}  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ["SD'  
 return TRUE; // return TRUE unless you set the focus to a control N2\{h(*u  
} 7(]M`bBH  
+~!\;71:f  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) oh.8WlI  
{ #6F/:j;  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Qcs >BOV~  
 { *S] K@g  
  CAboutDlg dlgAbout; 7N}==T89[  
  dlgAbout.DoModal(); faPgp  
 } IT0 [;eqR  
 else \4"01:u'  
 { mH5[(?   
  CDialog::OnSysCommand(nID, lParam); +w9X$<?_  
 } %tT=q^%5  
} mFW/xZwR,5  
?b3({P  
void CCaptureDlg::OnPaint() QRAw#  
{ w6@8cNXK  
 if (IsIconic()) n}toUqUnk\  
 { ,,CheRO  
  CPaintDC dc(this); // device context for painting P= nu&$;  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ^^{7`X u  
  // Center icon in client rectangle prCr"y` M  
  int cxIcon = GetSystemMetrics(SM_CXICON); 0qhSV B5  
  int cyIcon = GetSystemMetrics(SM_CYICON); ZFa<{J<2  
  CRect rect; 6*%E4#4  
  GetClientRect(&rect); f1 TYQ?e  
  int x = (rect.Width() - cxIcon + 1) / 2; CZ}%\2>-v  
  int y = (rect.Height() - cyIcon + 1) / 2; VZEDBZ x*  
  // Draw the icon ,B||8W9  
  dc.DrawIcon(x, y, m_hIcon); Fv2U@n6'v  
 } RAi]9`*7  
 else 1^^9'/  
 { #S*cFnd  
  CDialog::OnPaint(); KdU&q+C^  
 } @zAav>  
} K %Qj<{)  
Nd;,Wz]  
HCURSOR CCaptureDlg::OnQueryDragIcon() ~2M+Me  
{ _~a5;[~  
 return (HCURSOR) m_hIcon; '1[Bbs  
} Q|i`s=|  
O&ZVu>`g  
void CCaptureDlg::OnCancel() Yo a|.2f  
{ K f}h{X  
 if(bTray) >gGdzL  
  DeleteIcon(); ?*: mR|=  
  CDialog::OnCancel(); D<UX^hU   
} O [v(kH'  
;@ lC08SE  
void CCaptureDlg::OnAbout() Gz@/:dW^vZ  
{ IPEJ7 n49  
 CAboutDlg dlg; 4Up \_  
 dlg.DoModal(); c/ s$*"  
} ^yp`<=  
i)mQ?Y#o  
void CCaptureDlg::OnBrowse() \*.u (8~2o  
{ $zYo~5M?i-  
 CString str;  SE D_^  
 BROWSEINFO bi; D?6ah=:&R  
 char name[MAX_PATH]; V{+5Fas^l  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); iIO_d4Z  
 bi.hwndOwner=GetSafeHwnd(); &HIG776  
 bi.pszDisplayName=name; GK\`8xWE  
 bi.lpszTitle="Select folder"; J6W"t  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; +VdC g_  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ^7$V>|  
 if(idl==NULL) aK4ZH}XHE"  
  return; %X>P+6<=  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH));  %3A~&  
 str.ReleaseBuffer(); =!Ce#p?h,  
 m_Path=str; jo ^+  
 if(str.GetAt(str.GetLength()-1)!='\\') W^Z#_{  
  m_Path+="\\"; YKWts y  
 UpdateData(FALSE); 6p1)wf.J  
} |JRaskd  
fx `oe  
void CCaptureDlg::SaveBmp() B jsF5~+\  
{ d-BUdIz  
 CDC dc; OZed+t=  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); [Adkj  
 CBitmap bm; QH.zsqf(  
 int Width=GetSystemMetrics(SM_CXSCREEN); T3#KuiwU9  
 int Height=GetSystemMetrics(SM_CYSCREEN); "{Jq6):mp  
 bm.CreateCompatibleBitmap(&dc,Width,Height);  ZXL  
 CDC tdc; [yf&]0  
 tdc.CreateCompatibleDC(&dc); g?=|kp  
 CBitmap*pOld=tdc.SelectObject(&bm); %}x$YD O  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); =V(|3?N  
 tdc.SelectObject(pOld); Wp0L!X=0  
 BITMAP btm; !w #x@6yq  
 bm.GetBitmap(&btm); \]gUX-  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ZclZD{%8J  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); !3 j@gi2  
 BITMAPINFOHEADER bih; pXBlTZf  
 bih.biBitCount=btm.bmBitsPixel; Z{gJm9  
 bih.biClrImportant=0; 7m +d;x2  
 bih.biClrUsed=0; 4kqgZtg.  
 bih.biCompression=0; %L;;W,l$`)  
 bih.biHeight=btm.bmHeight; U{%N.4:   
 bih.biPlanes=1; wdzZ41y1  
 bih.biSize=sizeof(BITMAPINFOHEADER); Y]-7T-*+t  
 bih.biSizeImage=size; +rcDA|  
 bih.biWidth=btm.bmWidth; U~1jmxE  
 bih.biXPelsPerMeter=0; lIDGL05f'  
 bih.biYPelsPerMeter=0; 1e(Q I) ~  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 0^ IHBN?9  
 static int filecount=0; 1`z^Xk8vt  
 CString name; g Xi& S  
 name.Format("pict%04d.bmp",filecount++); ^KO=8m( )J  
 name=m_Path+name; Jkq?wpYp  
 BITMAPFILEHEADER bfh; Q@"mL  
 bfh.bfReserved1=bfh.bfReserved2=0; 5(V'<  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ;\[ el<Y)s  
 bfh.bfSize=54+size; Ja(>!8H>@  
 bfh.bfOffBits=54; [sF z ;Py]  
 CFile bf; oiL^$y/:;z  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ~:M"JNcs  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); |wYOO(!  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); B^C!UWN>%X  
  bf.WriteHuge(lpData,size); {:m%n-  
  bf.Close(); e6JT|>9A7  
  nCount++; n 0*a.  
 } f+o%N  
 GlobalFreePtr(lpData); Pk 6l*+"r<  
 if(nCount==1) B[Gl}(E  
  m_Number.Format("%d picture captured.",nCount); knU=#  
 else ;[}<xw3):  
  m_Number.Format("%d pictures captured.",nCount); .o?"=Epo  
  UpdateData(FALSE); \gE6KE<?p  
} Rz_fNlA  
JDA:)[;  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) p[Yja y+  
{ WP b4L9<  
 if(pMsg -> message == WM_KEYDOWN) K9 tuiD+j  
 { EX.`6,:+2  
  if(pMsg -> wParam == VK_ESCAPE) fZ)M Dq  
   return TRUE; se:lKZZ]  
  if(pMsg -> wParam == VK_RETURN) =|_{J"sv  
   return TRUE; *#n?6KqZ  
 } 4gRt^T-?  
 return CDialog::PreTranslateMessage(pMsg); RO10$1IW.2  
} u_~*)w+mS@  
},@1i<Bb  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5C^oqUZ  
{ d l<7jM?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 6I yD7PQ  
  SaveBmp(); sMhUVc4  
  return FALSE; b9(_bsc  
} q=H dGv  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ; Fi(zl  
 CMenu pop; !gm;g}]szG  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); >PD*)Uq&  
 CMenu*pMenu=pop.GetSubMenu(0); yS)73s/MrY  
 pMenu->SetDefaultItem(ID_EXITICON); V7\@g  
 CPoint pt; qbwX*E~ ;  
 GetCursorPos(&pt); ZI8*PX%2  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;jEDGKLq  
 if(id==ID_EXITICON) cJ> #jl&  
  DeleteIcon(); ;[ag|YU$Y  
 else if(id==ID_EXIT) #'<s/7;~  
  OnCancel(); $<[Q8V-  
 return FALSE; 3TDjWW;#~  
} r?l7_aBv3  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); D0f.XWd  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) V&75n.L  
 AddIcon(); j~)GZV  
 return res; uR:@7n  
} @},25"x)  
Q{~WWv  
void CCaptureDlg::AddIcon() vA r fsgk  
{ =d{B.BP(  
 NOTIFYICONDATA data; 9 Z 5!3  
 data.cbSize=sizeof(NOTIFYICONDATA); !Xzne_V<  
 CString tip; JQt Bt2  
 tip.LoadString(IDS_ICONTIP); tf5h/:  
 data.hIcon=GetIcon(0); {M.OOEcIp  
 data.hWnd=GetSafeHwnd(); 0L5 n<<7  
 strcpy(data.szTip,tip); os3jpFeG'  
 data.uCallbackMessage=IDM_SHELL; jBO/1h=  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ,+gU^dc|hq  
 data.uID=98; Tf bB1  
 Shell_NotifyIcon(NIM_ADD,&data); S-$N!G~!  
 ShowWindow(SW_HIDE); Hlr[x  
 bTray=TRUE; Id/-u[-yo  
} s?irT;=  
ky^p\dMh  
void CCaptureDlg::DeleteIcon() =@%Ukrd@  
{ #Oeb3U  
 NOTIFYICONDATA data; k[`9RGT  
 data.cbSize=sizeof(NOTIFYICONDATA); W8$ky[2R  
 data.hWnd=GetSafeHwnd(); v%=@_`Ht  
 data.uID=98; 0^L>J "o  
 Shell_NotifyIcon(NIM_DELETE,&data); 007(k"=oV  
 ShowWindow(SW_SHOW); `|Wu\X  
 SetForegroundWindow(); [vJLj>@  
 ShowWindow(SW_SHOWNORMAL); I)B+h8l72<  
 bTray=FALSE; K>tubLYh  
} "\x<Zg;  
#'@pL0dj  
void CCaptureDlg::OnChange() 8{t^< j$n  
{ |\lsTY&2  
 RegisterHotkey(); / X #4  
} O_M2Axm  
vIL'&~C\y  
BOOL CCaptureDlg::RegisterHotkey() *K<|E15 ,  
{ ODbEL/  
 UpdateData(); m=hlim;P,  
 UCHAR mask=0; v|WTm#  
 UCHAR key=0; Y M <8>d  
 if(m_bControl) _>G.  
  mask|=4; * 7<{Xbsj^  
 if(m_bAlt) 0I`)<o-  
  mask|=2; /oWn0  
 if(m_bShift) gyz#:z$p^  
  mask|=1; DxFmsjX[L  
  key=Key_Table[m_Key.GetCurSel()]; S^Lu RF]F  
 if(bRegistered){ rW8.bMmM  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); aw\\oN*  
  bRegistered=FALSE; Cw*:`  
 } W7_j;7'  
 cMask=mask; Em%0C@C  
 cKey=key; ZCT\4Llv#  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); G`_LD+  
 return bRegistered; zmw <y2`  
} )\q A[rTG  
C V{kP8#  
  四、小结 . paA0j  
1kd\Fq^z$  
  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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