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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: K'+GK S7.  
  -o#HO_9  
  一、实现方法 Uc/MPCqZ  
'j6PL;~c  
  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: qsk8#  
8l-+ 4~mH  
#pragma data_seg("shareddata") j(HC^\Hi  
HHOOK hHook =NULL; //钩子句柄 u>Z;/kr  
UINT nHookCount =0; //挂接的程序数目 QKDY:1]  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 HaXlc8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 >:!TfuU^R  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 8zS't2 u  
static int KeyCount =0; Ad xCP\S&  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 x]&V7Y   
#pragma data_seg() $`W .9  
WX&Man!f  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 WHk/Rg%<  
axW3#3#`  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: -yHVydu=  
=/&ob%J)9]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 4# MvOjA5[  
cKey,UCHAR cMask) dVmI.A'nbp  
{ PsU.dv[  
 BOOL bAdded=FALSE; 4h\MSTF*  
 for(int index=0;index<MAX_KEY;index++){ 3/+9#  
  if(hCallWnd[index]==0){ QkBT, c  
   hCallWnd[index]=hWnd; .|}ogTEf  
   HotKey[index]=cKey; PdcF  
   HotKeyMask[index]=cMask; [8l;X:  
   bAdded=TRUE; n|dLK.Q  
   KeyCount++; 2siUpmX  
   break; Gnop  
  } /.l8Jb4  
 } O'{UAb+-  
 return bAdded; ?}\aG3_4  
} |q"WJQ  
//删除热键 /bv `_ >  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -H5n>j0!{  
{ u1s^AW8 y  
 BOOL bRemoved=FALSE; #m{K  
 for(int index=0;index<MAX_KEY;index++){ PXof-W  
  if(hCallWnd[index]==hWnd){ h4N!zj[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ J;,6ydf8!  
    hCallWnd[index]=NULL; DksSD  
    HotKey[index]=0; %B5.zs]Of  
    HotKeyMask[index]=0; h?5$-#q~  
    bRemoved=TRUE;  s.&ewf\  
    KeyCount--; h<U<K O  
    break; S'#KPzy.  
   } fz#e4+oH  
  } R h zf.kp  
 } Y0fX\6=h  
 return bRemoved; xZZW*d_b  
} [ &RZ&  
ESp)%  
/_ }xTP"9  
  DLL中的钩子函数如下: GzxtC  &  
FZ'|z8Dm  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) < ek_n;R  
{ *jM~VTXwt  
 BOOL bProcessed=FALSE; aRPgo0,W1  
 if(HC_ACTION==nCode) yb*P&si5bY  
 { ]`)50\pdw  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Mk9'  
   switch(wParam) v*`$is+  
   {  8gwJ%"-K  
    case VK_MENU: K-(k6<h  
     MaskBits&=~ALTBIT; ,6:ya8vB  
     break; (yIl]ZN*  
    case VK_CONTROL: $o"S zy  
     MaskBits&=~CTRLBIT; W}p>jP}  
     break; 1^ZQXUzl%i  
    case VK_SHIFT: U?97yc\$  
     MaskBits&=~SHIFTBIT; c'B6E1}sx  
     break; v1%rlP  
    default: //judge the key and send message )X2=x^u*U  
     break; ;Nf5,D.D  
   } rt)70=  
   for(int index=0;index<MAX_KEY;index++){ awLN>KI]</  
    if(hCallWnd[index]==NULL) aTF~rAne<  
     continue; Q/&H3N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sN0S~}F+  
    { ( P|Ph  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9,wd,,ta  
     bProcessed=TRUE; 1CK}XLdr  
    } F`KA^ZI  
   } rZ5vey  
  } -02c I}e  
  else if((lParam&0xc000ffff)==1){ //有键按下 gp'9Pf;\[  
   switch(wParam) T^.;yU_B?  
   { #s'9Ydd  
    case VK_MENU: Wh6jr=>G  
     MaskBits|=ALTBIT; d7s? c  
     break; \o3)\ e]o  
    case VK_CONTROL: ,tJ%t#  
     MaskBits|=CTRLBIT; ][3H6T!ckL  
     break; pwAawm  
    case VK_SHIFT: ={,\6a|]:  
     MaskBits|=SHIFTBIT; ?;Dh^mc  
     break; /4{ 6`  
    default: //judge the key and send message ZD\`~I|gp  
     break; YCZl1ry:V=  
   } Y-\/Y*;cd  
   for(int index=0;index<MAX_KEY;index++){ &TYTeJ]  
    if(hCallWnd[index]==NULL) 5q?2?j/h  
     continue; D# |+PG7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ))f%3_H  
    { % B+W#Q`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6U[`CGL66  
     bProcessed=TRUE; t=M:L[bis;  
    } R{Q*"sf  
   } U5Say3r  
  } ,>%2`Z)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 1FCqkwq[  
   for(int index=0;index<MAX_KEY;index++){ mOji\qia  
    if(hCallWnd[index]==NULL) Im7<\ b@  
     continue; 'F>eieO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "]h4L  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ParOWs~W/  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 wz^Q,Od  
   } Ojqbj0E9  
  } .y'iF>QQ\  
 } 6\>S%S2:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 1|$V  
} 5u +U^D  
'q%56WAJ  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: s%F}4W2s  
ArWMbT>Zqw  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;Q"xXT`;:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ay\=&4dv  
 eX7dyM  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: *ue- x!"c  
/Y$UJt  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) b|mWEB.p  
{ A;~lG3j4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) xVk|6vA7  
 { ^uB9EP*P  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ?m.WqNBH7  
  SaveBmp(); IB9[Lx  
  return FALSE; ~\_aT2j0  
 } / blVm1F  
 …… //其它处理及默认处理 7PQ03dtfg  
} (B|4wR\  
+vOlA#t%Z  
w#]> Nf  
  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。 Hl`S\  
tPu0r],`o  
  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。 &:1PF.)N  
'<! b}1w0  
  二、编程步骤 4q sIJJ[.  
48;6C g  
  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"; ct,B0(]  
m(MPVY<X  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ?sfas57&y  
`o~ dQb/k+  
  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; Ia_I~ U$  
.B 2?%2S  
  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; Q72}V9I9  
HKu? J  
  5、 添加代码,编译运行程序。 f Z8%Z   
x'IVP[xh`A  
三、程序代码 ~aKM+KmtPH  
GJ YXCi  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL hx|Cam"  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) reo  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ %04N"^mT'~  
#if _MSC_VER > 1000 :`('lrq  
#pragma once Qtj.@CGB  
#endif // _MSC_VER > 1000 !RX\">z  
#ifndef __AFXWIN_H__ 05= $Dnv  
#error include 'stdafx.h' before including this file for PCH n^F:p*)Q%  
#endif :)f/>-   
#include "resource.h" // main symbols 1aEM&=h_W  
class CHookApp : public CWinApp *sNZ.Y:.  
{ %`*`HU#X  
 public: 1Rrp#E}  
  CHookApp(); D7q%rO|F'  
  // Overrides zTA+s 2  
  // ClassWizard generated virtual function overrides &'%b1CbE  
  //{{AFX_VIRTUAL(CHookApp) ]2O52r  
 public: dkTewT6'  
  virtual BOOL InitInstance(); hcWYz  
  virtual int ExitInstance(); #4hxbRN  
  //}}AFX_VIRTUAL },r30`)Q  
  //{{AFX_MSG(CHookApp) yCznRd}J  
  // NOTE - the ClassWizard will add and remove member functions here. 5=< y%VF  
  // DO NOT EDIT what you see in these blocks of generated code ! @9-/p^n1  
  //}}AFX_MSG 2.''Nt6|  
  DECLARE_MESSAGE_MAP() fL^+Qb}  
}; >q W_%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); $P<T`3Jg  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dnRS$$9#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2R}9wDP  
BOOL InitHotkey(); <{$0mUn;s|  
BOOL UnInit(); tJ:]ne   
#endif ey'x3s_  
uZ[7[mK}n7  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. P .I <.e  
#include "stdafx.h" lw/zgR#|  
#include "hook.h" ,-!h  
#include <windowsx.h> yb 7  
#ifdef _DEBUG fL3Px  
#define new DEBUG_NEW &8kc0Z@y  
#undef THIS_FILE 61qs`N=k  
static char THIS_FILE[] = __FILE__; i%~^3/K  
#endif )=,%iL -  
#define MAX_KEY 100 ;%-f>'KhI7  
#define CTRLBIT 0x04 }^T7S2_Qy  
#define ALTBIT 0x02 _<;;CI3w  
#define SHIFTBIT 0x01 eN*=wOh  
#pragma data_seg("shareddata") cJb.@8^J  
HHOOK hHook =NULL; 8:W," "  
UINT nHookCount =0; )8BGN'jyi  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  m}t.E  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT |jh&a+4W  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 4k}3^.#  
static int KeyCount =0; )- 2sk@y  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift .I~#o$6  
#pragma data_seg() ZkbaUIQ  
HINSTANCE hins; [VvTR#^  
void VerifyWindow(); 7d9kr?3(U  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) jg2 UX   
//{{AFX_MSG_MAP(CHookApp) &/%A 9R,  
// NOTE - the ClassWizard will add and remove mapping macros here. q. i2BoOd  
// DO NOT EDIT what you see in these blocks of generated code! m 2tw[6M  
//}}AFX_MSG_MAP xZmO^F5KHj  
END_MESSAGE_MAP() G)p pkH`qj  
Cxn<#Kf\-<  
CHookApp::CHookApp() *t_"]v-w  
{ q_0So}  
 // TODO: add construction code here, ;3\oU$'  
 // Place all significant initialization in InitInstance YH_mWN\Wu  
} +sN'Y/-  
\0}!qG![AA  
CHookApp theApp; YIP /N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {VB n@^'s  
{ , `4chD  
 BOOL bProcessed=FALSE; F0 yvV6;  
 if(HC_ACTION==nCode) g43j-[j)  
 { ;3 N0)  
  if((lParam&0xc0000000)==0xc0000000){// Key up r>!$eqX_  
   switch(wParam) Ino$N|G[  
   { ^,P# <,D,  
    case VK_MENU: i=m5M]Ef  
     MaskBits&=~ALTBIT; ,r$k79TI  
     break; (s:ihpI  
    case VK_CONTROL: cr}T ? $\K  
     MaskBits&=~CTRLBIT;  18(hrj  
     break; s^atBqw,  
    case VK_SHIFT: <>gX'te  
     MaskBits&=~SHIFTBIT; TH;kJ{[}  
     break; &E{CQ#k  
    default: //judge the key and send message 8$!&D&v  
     break; +XaRwcLC.  
   } YY! Lv:.7>  
   for(int index=0;index<MAX_KEY;index++){ [r[IWy(}  
    if(hCallWnd[index]==NULL) ].=~C"s,a  
     continue; #3b_ #+,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) pQQN8Y~^Y  
    { <)hA? 3J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); {ylY"FA  
     bProcessed=TRUE; wiwAdYEQ\  
    } dC&OjBQ  
   } 4trP*u,4  
  } Ry$zF~[   
  else if((lParam&0xc000ffff)==1){ //Key down s} I8:ufT  
   switch(wParam) W0zRV9"P  
   { pUGFQ."\  
    case VK_MENU: W6e,S[J^FY  
     MaskBits|=ALTBIT; |4$.mb.  
     break; 8OS@gpz  
    case VK_CONTROL: ,M4G_U[  
     MaskBits|=CTRLBIT; lpjeEaw o4  
     break; -<g&U*/E  
    case VK_SHIFT: i6S5 4&^!  
     MaskBits|=SHIFTBIT; r JvtE}x1  
     break; (D\7EH\9,]  
    default: //judge the key and send message n@TK}?\UoR  
     break; A` 'k5uG  
   } `u<\ 4&W  
   for(int index=0;index<MAX_KEY;index++) G_vcuCHm  
   { _1c0pQ^}3  
    if(hCallWnd[index]==NULL) ?%|w?Fdx-  
     continue; _u[2R=h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >,Z[IAU.x5  
    { 9\QeH'A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); uwL^Tq}Yh  
     bProcessed=TRUE; cuw 7P  
    } ax.;IU  
   } %>z4hH,  
  } {^5LolCCH  
  if(!bProcessed){ Wz8 MV -D  
   for(int index=0;index<MAX_KEY;index++){ #Nv^F  
    if(hCallWnd[index]==NULL) kFRl+,bi~  
     continue; s%& /Zt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) KT 4h3D`,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Gu#Vc.e  
   } O(R1D/A[  
  } jkQ%b.a  
 } y[D8rFw  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); z[cs/x  
} c\Z.V*o  
^vj}  
BOOL InitHotkey() s~z~9#G(6  
{ }&*wJ]j`L  
 if(hHook!=NULL){ & t.G4  
  nHookCount++; \80W?9qj  
  return TRUE; r_x|2 A oO  
 } /wR,P  
 else iBM;$0Y  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); u~C,x3yr  
  if(hHook!=NULL) xg;o<y KF  
   nHookCount++; j`D%Wx_  
  return (hHook!=NULL); nrF5^eZ#  
}  kS7`g A  
BOOL UnInit() QX`T-)T e  
{ wv7XhY}  
 if(nHookCount>1){ +55+%oGl  
  nHookCount--; M+L8~BD@  
  return TRUE; _.{I1*6Y2  
 } >1$ vG  
 BOOL unhooked = UnhookWindowsHookEx(hHook); @W1F4HYds  
 if(unhooked==TRUE){ 2Y7u M;8  
  nHookCount=0; n9%&HDl4  
  hHook=NULL; b2tUJ2p  
 } *QGyF`Go{  
 return unhooked; 5r)]o'? s  
} V JJ6q  
6CV9ewr  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) m]?C @ina  
{ $(r/N"6)O2  
 BOOL bAdded=FALSE; V0/PjD,jP  
 for(int index=0;index<MAX_KEY;index++){ D}MCVNd^  
  if(hCallWnd[index]==0){ lEYAq'=  
   hCallWnd[index]=hWnd; S;8gX1Uf  
   HotKey[index]=cKey; W]CsKN,K  
   HotKeyMask[index]=cMask; ~Z>!SMXp<  
   bAdded=TRUE; (-[73v-w  
   KeyCount++; 4Zn"K}q  
   break; Mb^E  
  } ,J4rKGG  
 } ubQbEv{(,  
 return bAdded; WAUgbImc{  
} Xl %ax!/  
)ppIO"\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) c-y`Hm2"  
{ PB(q9gf"1}  
 BOOL bRemoved=FALSE; BY5ODc$  
 for(int index=0;index<MAX_KEY;index++){ {8pN]=SaJ~  
  if(hCallWnd[index]==hWnd){ #]kO/Mr  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ RYyM;<9F  
    hCallWnd[index]=NULL; p.|M:C\xL  
    HotKey[index]=0; q2e=(]rKE{  
    HotKeyMask[index]=0; 9 S4bg7  
    bRemoved=TRUE; $X_A 74 (  
    KeyCount--; KCl85Wi'  
    break; di4>Ir~]  
   } NVX@1}  
  } 'JRYf;9c  
 } >X_5o^s2s  
 return bRemoved; m#,AD,s  
} \|YIuzlO4  
:V!F~  
void VerifyWindow() p9-s'F|@i  
{ ,<t)aZL,A;  
 for(int i=0;i<MAX_KEY;i++){ Tl!}Rw~Pg  
  if(hCallWnd!=NULL){ o JX4+uJ  
   if(!IsWindow(hCallWnd)){ UGP,/[XI  
    hCallWnd=NULL; GO]5~ 4k  
    HotKey=0; V%Ww;Ca]I  
    HotKeyMask=0; i@L_[d^|j`  
    KeyCount--; C0}@0c  
   } 60#eTo?}o  
  } >pm`(zLn  
 } ~zYk,;m  
} sW&5Mu-  
xl ]1TB@  
BOOL CHookApp::InitInstance() 61W[  
{ 1W'0h$5^"  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); @h,3"2W{Ev  
 hins=AfxGetInstanceHandle(); WD>z  
 InitHotkey(); dvu8V_U  
 return CWinApp::InitInstance(); 4q)+nh~s  
} JFu9_=%+  
cd(YH! 3  
int CHookApp::ExitInstance() dqgH"g  
{ 6FkBb !ASk  
 VerifyWindow(); 7V2xg h!W  
 UnInit(); O?$]/d  
 return CWinApp::ExitInstance(); ?Q~o<%U7  
} IAi|4,y_L  
m0p%R>:5  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Fv-~v&  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \A 5Na-/9  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ o/hj~;(]  
#if _MSC_VER > 1000 VZ$^:.I0  
#pragma once |c[= V?AC  
#endif // _MSC_VER > 1000 ctMH5"F&1  
-BC`p 8  
class CCaptureDlg : public CDialog N}ZBtkR  
{ \YPv pUg  
 // Construction _P9*78  
 public: <!q_C5>XJ  
  BOOL bTray; oV'G67W  
  BOOL bRegistered; I+/fX0-Lib  
  BOOL RegisterHotkey(); JqV}>"WMV  
  UCHAR cKey; fb8)jd'~}O  
  UCHAR cMask; !;Vqs/E  
  void DeleteIcon(); X?.tj Z,  
  void AddIcon(); w/e?K4   
  UINT nCount; 1G8,Eah  
  void SaveBmp(); Vt(s4  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor `>& K=C?  
  // Dialog Data 8`z  
  //{{AFX_DATA(CCaptureDlg) U&W/Nj  
  enum { IDD = IDD_CAPTURE_DIALOG }; snYyxi  
  CComboBox m_Key; [nf 5<  
  BOOL m_bControl; * .g[vCy  
  BOOL m_bAlt; oFKTBH:I  
  BOOL m_bShift; xEg@Y"NQ  
  CString m_Path; t 7D~JAx6  
  CString m_Number; .q<5OE(f  
  //}}AFX_DATA SQJ +C%   
  // ClassWizard generated virtual function overrides $ZkT G  
  //{{AFX_VIRTUAL(CCaptureDlg) i`w)dS  
 public: Xc$Zkfmms  
  virtual BOOL PreTranslateMessage(MSG* pMsg); e F)my  
 protected: P9)L1l<3I  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ue*o>iohB  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); H 3so&_  
  //}}AFX_VIRTUAL $;rvKco)%  
  // Implementation W[:CCCDL  
 protected: `<-/e%8  
  HICON m_hIcon; <k 'zz:[c!  
  // Generated message map functions s6k(K>Pl  
  //{{AFX_MSG(CCaptureDlg) S1#5oy2  
  virtual BOOL OnInitDialog(); c8Nl$|B  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Nw '$r  
  afx_msg void OnPaint(); owx0J,,G  
  afx_msg HCURSOR OnQueryDragIcon(); mFmxEv  
  virtual void OnCancel(); tL M@o|:  
  afx_msg void OnAbout(); gwbV$[.X  
  afx_msg void OnBrowse(); B'I_i$g4w  
  afx_msg void OnChange();  (duR1Dz  
 //}}AFX_MSG kqjj&{vPFJ  
 DECLARE_MESSAGE_MAP() 7Vu f4Z5  
}; HWFL u  
#endif s Fx0  
9)>+r6t  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ECk3Da  
#include "stdafx.h" ]xGpN ]u  
#include "Capture.h" eo~b]D  
#include "CaptureDlg.h" /!%?I#K{Wq  
#include <windowsx.h> tn;{r  
#pragma comment(lib,"hook.lib") /VD[:sU7  
#ifdef _DEBUG UrO& K]Z  
#define new DEBUG_NEW (+SL1O P  
#undef THIS_FILE  $Gcjm~  
static char THIS_FILE[] = __FILE__; rX0 ?m:&m  
#endif @hwNM#>`  
#define IDM_SHELL WM_USER+1 ~~@dbB  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _WZ{i,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); sR^b_/ElxT  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; t'Zv)Wu1E  
class CAboutDlg : public CDialog #jsN  
{ Bus]OF>hu  
 public: 4dy!2KZN  
  CAboutDlg(); P`avn  
  // Dialog Data -qBdcbi|x)  
  //{{AFX_DATA(CAboutDlg) aQ-SrxmO8  
  enum { IDD = IDD_ABOUTBOX }; p W@Yr  
  //}}AFX_DATA [hV}$0#E[O  
  // ClassWizard generated virtual function overrides sN K^.0  
  //{{AFX_VIRTUAL(CAboutDlg) J50n E~  
 protected: cG&@PO]+.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;ik,6_/Y  
  //}}AFX_VIRTUAL 2B^WZlx  
  // Implementation 2Bi?^kQ#  
 protected: @?RaU4e  
  //{{AFX_MSG(CAboutDlg) =!)x`1j!S  
  //}}AFX_MSG ?dXAHY  
  DECLARE_MESSAGE_MAP() .[+}nA,g%~  
}; jz S iw z  
K'B*D*w  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) zN9#qlfv  
{ ^Vi{._r  
 //{{AFX_DATA_INIT(CAboutDlg) gjx-tp 1.  
 //}}AFX_DATA_INIT  OO</d:  
} xUNq!({T  
5gkQ6& m  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) d|8-#.gV  
{ hAt4+O&P  
 CDialog::DoDataExchange(pDX); ;GKL[ tI"  
 //{{AFX_DATA_MAP(CAboutDlg) oF a,IA  
 //}}AFX_DATA_MAP zG{jRth  
} i'.D=o  
XMz*}B6GQ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?XeaoD/  
 //{{AFX_MSG_MAP(CAboutDlg) B@S~v+Gr  
 // No message handlers |bhv7(_  
 //}}AFX_MSG_MAP *>2e4j]  
END_MESSAGE_MAP() {jv+ J L"5  
ohs`[U=%~  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) B`||4*  
: CDialog(CCaptureDlg::IDD, pParent) ox_DEg7l  
{ R"l6|9tmP  
 //{{AFX_DATA_INIT(CCaptureDlg) lEw;X78+  
  m_bControl = FALSE; |~#A?mK-  
  m_bAlt = FALSE; IVy<>xpt  
  m_bShift = FALSE; oW(EV4J"  
  m_Path = _T("c:\\"); `$XB_ o%@  
  m_Number = _T("0 picture captured."); yo(MJ^=d  
  nCount=0; X|&H2y|*7  
  bRegistered=FALSE; YWJ$Pp  
  bTray=FALSE; q<Qjc  
 //}}AFX_DATA_INIT 0FLCN!i1  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 "?kDR1=7A  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); w`D$W&3>  
} r)Vpt fg;  
fwmXIpteK  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) o5sw]R5  
{ uF1&m5^W  
 CDialog::DoDataExchange(pDX); U#bmMH  
 //{{AFX_DATA_MAP(CCaptureDlg) Ya> AI.!K  
  DDX_Control(pDX, IDC_KEY, m_Key); [qxU \OSC  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); :I2,  
  DDX_Check(pDX, IDC_ALT, m_bAlt);  F=a  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); OjNOvh&N  
  DDX_Text(pDX, IDC_PATH, m_Path); 5%4yUd#b  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ,CN (;z)  
 //}}AFX_DATA_MAP m`):= ^nC  
} .5AFAGv_c  
+FAxqCkA  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) nLmF5.&  
//{{AFX_MSG_MAP(CCaptureDlg) o4OB xHKy  
 ON_WM_SYSCOMMAND() <6s@eare8  
 ON_WM_PAINT() @2mWNYHR*>  
 ON_WM_QUERYDRAGICON() rA^=;?7Q  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ?6>*mdpl  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) +>%51#2.Q  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 8'_MCx(  
//}}AFX_MSG_MAP ;(jL`L F  
END_MESSAGE_MAP() =v 'Aub  
q317~ z_nl  
BOOL CCaptureDlg::OnInitDialog() M,X)rM}Q  
{ }_F:]lI*R  
 CDialog::OnInitDialog(); dA E85  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); A:D9qp  
 ASSERT(IDM_ABOUTBOX < 0xF000); %O f w"W  
 CMenu* pSysMenu = GetSystemMenu(FALSE); @'5*jXd  
 if (pSysMenu != NULL) ?m+];SJk  
 { wjZ Q.T!  
  CString strAboutMenu; Gy;Fe=  
  strAboutMenu.LoadString(IDS_ABOUTBOX); zGNW5S9G  
  if (!strAboutMenu.IsEmpty()) GU9G5S.  
  { u!HX`~q+A  
   pSysMenu->AppendMenu(MF_SEPARATOR); (+0(A777M  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); zg@i7T  
  } z@o6[g/*Q  
 } (C1~>7L  
 SetIcon(m_hIcon, TRUE); // Set big icon CE!cZZ  
 SetIcon(m_hIcon, FALSE); // Set small icon >,tJq %  
 m_Key.SetCurSel(0); SS24@:"{  
 RegisterHotkey(); Slj U=,  
 CMenu* pMenu=GetSystemMenu(FALSE); KATf9-Sz  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); c~ vql4  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); _cC1u7U9  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 1 0.Z Bfn  
 return TRUE; // return TRUE unless you set the focus to a control r NKeY48\  
} _~{J."q  
P;-.\VRu  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ya5HAs  
{ Iz83T9I&  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Q`6hJgyL  
 { $tXW/  
  CAboutDlg dlgAbout; N$v_z>6Z  
  dlgAbout.DoModal(); _L` uC jA  
 } u^B!6Sj8  
 else Y0-?"R8  
 { "EA =auN{  
  CDialog::OnSysCommand(nID, lParam); %`K{0b  
 } Hmk xE  
} Ayv:Pv@  
V6_5v+n  
void CCaptureDlg::OnPaint() );y ZyWDV  
{ ,3iD/8_  
 if (IsIconic()) ]Hq,Pr_+  
 { akPd#mf  
  CPaintDC dc(this); // device context for painting Iw`|,-|  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); jcvq:i{  
  // Center icon in client rectangle _?y3&4N)  
  int cxIcon = GetSystemMetrics(SM_CXICON); |Kjfh};-C  
  int cyIcon = GetSystemMetrics(SM_CYICON); 8B-mZFXpK  
  CRect rect; 'p\&Mc_Gu  
  GetClientRect(&rect); Cg%Owe/E?0  
  int x = (rect.Width() - cxIcon + 1) / 2; ki}Li*)7  
  int y = (rect.Height() - cyIcon + 1) / 2; Y~Vc|zM^(  
  // Draw the icon kOdpW  
  dc.DrawIcon(x, y, m_hIcon); kP/<S<h,g  
 } &cTOrG  
 else ;K|K]c  
 { f2pA+j5[  
  CDialog::OnPaint(); ^c/3 !"wK  
 } "w0~f6o  
} )E7wBNV   
L[<Y6u>m!1  
HCURSOR CCaptureDlg::OnQueryDragIcon() %X^qWKix}m  
{ oR!h eCnu  
 return (HCURSOR) m_hIcon; lq]8zm<\)]  
} rZ5xQ#IA  
{QmK4(k?|c  
void CCaptureDlg::OnCancel() *93=}1gN  
{ zBwqIJfM  
 if(bTray) u|.|dv'mbp  
  DeleteIcon(); :xq{\"r  
  CDialog::OnCancel(); "VHT5k  
} ~`^kP.()  
BB9eQ: xO  
void CCaptureDlg::OnAbout() $cuBd  
{ #`U?,>2q  
 CAboutDlg dlg; \CE+P5  
 dlg.DoModal(); vXwMo4F*  
} *?C8,;=2r  
\ZhkOl  
void CCaptureDlg::OnBrowse() !};Ll=dz  
{ R/fE@d2~In  
 CString str; 8''1H<f  
 BROWSEINFO bi; OC-d5P  
 char name[MAX_PATH]; wu11)HFL|z  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); uOKD#   
 bi.hwndOwner=GetSafeHwnd(); bG*l_  
 bi.pszDisplayName=name; ?/5<}W#7}  
 bi.lpszTitle="Select folder"; ])bgUH  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 7QZy d-  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 8 $H\b &u  
 if(idl==NULL) $!!y v'K  
  return; Pg`+Q^^6S  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); UM`$aPz  
 str.ReleaseBuffer(); s?;V!t  
 m_Path=str; '/Vm[L$d  
 if(str.GetAt(str.GetLength()-1)!='\\') ;"e55|d9I  
  m_Path+="\\"; ]5:[6;wS  
 UpdateData(FALSE); IG;= |  
} Oml3=TV  
{M=B5-  
void CCaptureDlg::SaveBmp() QhAYCw2  
{ oa5L5Zr,A  
 CDC dc; j jv'"K2  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); F3$8l[O_  
 CBitmap bm; BILZ XMf  
 int Width=GetSystemMetrics(SM_CXSCREEN); Mh3L(z]/E  
 int Height=GetSystemMetrics(SM_CYSCREEN); |HJ`uGN<b  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ) k[XO  
 CDC tdc; `WxGU  
 tdc.CreateCompatibleDC(&dc); N>sT@ > )  
 CBitmap*pOld=tdc.SelectObject(&bm); W np[8IEU  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); X|g5tnsj`  
 tdc.SelectObject(pOld); qC& xuu|  
 BITMAP btm; hBcklI  
 bm.GetBitmap(&btm); E5|GP  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; t1oTZ  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); FEopNDy@y  
 BITMAPINFOHEADER bih; n>:e8KVM;  
 bih.biBitCount=btm.bmBitsPixel; qPUACuF'  
 bih.biClrImportant=0; : 4lR`%  
 bih.biClrUsed=0; 3BLH d<  
 bih.biCompression=0; t4~?m{  
 bih.biHeight=btm.bmHeight; 2v4&'C  
 bih.biPlanes=1; 5 ^l-3s?M  
 bih.biSize=sizeof(BITMAPINFOHEADER); 2\O!vp>|-  
 bih.biSizeImage=size; VC Ay~,  
 bih.biWidth=btm.bmWidth; dvY3=~'  
 bih.biXPelsPerMeter=0; sT<h+[2d  
 bih.biYPelsPerMeter=0; |pU>^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); p&`I#6{  
 static int filecount=0; ZD$I-33W  
 CString name; B tJF1#f  
 name.Format("pict%04d.bmp",filecount++); l +`CgYo  
 name=m_Path+name; [{T/2IGq  
 BITMAPFILEHEADER bfh; %4#ChlXB  
 bfh.bfReserved1=bfh.bfReserved2=0; ntL%&wY  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Q'ib7R;V,  
 bfh.bfSize=54+size; Zw/??Tq b  
 bfh.bfOffBits=54; {+kWK;1  
 CFile bf; L+lye Ir'  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ AGVipI #  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); aK,\e/Oo  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); xs "\c7pC  
  bf.WriteHuge(lpData,size); $SniQ  
  bf.Close(); @}+B%R  
  nCount++; >%_i#|dE>  
 } ]i `~J  
 GlobalFreePtr(lpData); ,s@S`KS0  
 if(nCount==1) chE}`I?  
  m_Number.Format("%d picture captured.",nCount); Tn38]UL  
 else %F;uW[4r  
  m_Number.Format("%d pictures captured.",nCount); SokU9n!  
  UpdateData(FALSE); 3rX8H`R  
} ,>TDxI;  
`sRys oW  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Q2@yUDd!  
{ 0d`lugf  
 if(pMsg -> message == WM_KEYDOWN) aKRnj!4z  
 { Pb@$RAU6 3  
  if(pMsg -> wParam == VK_ESCAPE) ;D[I/U  
   return TRUE; vDc&m  
  if(pMsg -> wParam == VK_RETURN) [{ A5BE -  
   return TRUE; IY2f$YV  
 } 1gYvp9Ma  
 return CDialog::PreTranslateMessage(pMsg); :ZM=P3QZ  
} @Hp=xC9V  
+ J}h  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) wG22ffaki  
{ oOQ0f |MGp  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ]ddL'>$c$  
  SaveBmp(); :?#wWF.  
  return FALSE; 0J= $ A  
} BT5~MYBl  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ *vzj(HGO  
 CMenu pop; k.H4Mf(4  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); C\ cZ  
 CMenu*pMenu=pop.GetSubMenu(0); zfGr1;  
 pMenu->SetDefaultItem(ID_EXITICON); ]}_Ohe]X  
 CPoint pt; -N2m|%B  
 GetCursorPos(&pt); Vt4,?"  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 2-"`%rE  
 if(id==ID_EXITICON) MPsm)jqX  
  DeleteIcon(); jSvo-  
 else if(id==ID_EXIT) "fd'~e$S#  
  OnCancel(); + j6^g*  
 return FALSE; ;, u7)  
} H<`7){iG  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); KVpQ,x&q~  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8RVeKnpXTV  
 AddIcon(); t;[?Q\  
 return res;  0LUw  
} -kzg(+sm  
3HX-lg`0  
void CCaptureDlg::AddIcon() `S=4cSH(  
{ S'AS,'EnY  
 NOTIFYICONDATA data; Vjr}"K$Y  
 data.cbSize=sizeof(NOTIFYICONDATA); :HN\A4=kc(  
 CString tip; @'?7au ''  
 tip.LoadString(IDS_ICONTIP); ery{>|k  
 data.hIcon=GetIcon(0); 28xLaob  
 data.hWnd=GetSafeHwnd(); ~NO'8 Mr  
 strcpy(data.szTip,tip); 1 swqs7rR|  
 data.uCallbackMessage=IDM_SHELL; (R{z3[/u&  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Vdf~rV  
 data.uID=98; e= _7Q.cn  
 Shell_NotifyIcon(NIM_ADD,&data); |\q@XCGei  
 ShowWindow(SW_HIDE); 9 J~KM=p  
 bTray=TRUE; =Xb:.  
} ,V=]QHcg  
 OV$|!n  
void CCaptureDlg::DeleteIcon() dxWG+S  
{ DGx<Nys@B  
 NOTIFYICONDATA data; "& q])3h=  
 data.cbSize=sizeof(NOTIFYICONDATA); 3#c0p790  
 data.hWnd=GetSafeHwnd(); t3aDDu  
 data.uID=98; L>2gx$f  
 Shell_NotifyIcon(NIM_DELETE,&data); xO'xZ%cUI  
 ShowWindow(SW_SHOW); j|(bdTZY:  
 SetForegroundWindow(); `[.4SIah  
 ShowWindow(SW_SHOWNORMAL); o}lA\A  
 bTray=FALSE; Ns`:=  
} yvKKE  
s!K9-qZl<  
void CCaptureDlg::OnChange() K9euNa  
{ zzyD'n7D  
 RegisterHotkey(); !X/O1PM|  
} m9 f[nT  
DUu~s,A  
BOOL CCaptureDlg::RegisterHotkey() I~U;M+n*y  
{ 14rX:z  
 UpdateData(); [c#?@S_  
 UCHAR mask=0; I-|1eR+3  
 UCHAR key=0;  EoHrXv  
 if(m_bControl) a/p /<  
  mask|=4; r1Cq8vD*m  
 if(m_bAlt) (C8r^m|A  
  mask|=2; hk+"c^g:j<  
 if(m_bShift) si>gYO  
  mask|=1; {DGnh1  
  key=Key_Table[m_Key.GetCurSel()]; *[wj )  
 if(bRegistered){ L@LT*M  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); WzO[-csy  
  bRegistered=FALSE; V]A*' ke/  
 } 1ba* U~OEg  
 cMask=mask; ?O#,|\v?]  
 cKey=key; hvU\l`m  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $3 ~ /H"K  
 return bRegistered; !5h@uar  
} I)cA:Ip  
PsoW:t  
  四、小结 ++M%PF [ {  
Z"g6z#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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