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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 F_Uu  
  ~JNE]mg  
  一、实现方法 $MGKGWx@E  
,X1M!'  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: (X-( WMsqQ  
]f?r@U'AS|  
#pragma data_seg("shareddata") 7 )[2Ud8  
HHOOK hHook =NULL; //钩子句柄 uF1 4;  
UINT nHookCount =0; //挂接的程序数目 UJQTArf  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 I'^XEl?   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 }st~$JsV1  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey I\1"E y  
static int KeyCount =0; 9C2pGfEbn}  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 EpKZ.lCU  
#pragma data_seg() r]&sXKDc  
V=p"1!(  
  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。 j,;f#+O`g  
(9ZW^flY  
  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: Er|&4-9  
B~k{f}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 8(l0\R,%+z  
cKey,UCHAR cMask) 38m9t'  
{ W1<*9O  
 BOOL bAdded=FALSE; ^|6#Vx  
 for(int index=0;index<MAX_KEY;index++){ DBHHJD/q  
  if(hCallWnd[index]==0){ `GBJa k  
   hCallWnd[index]=hWnd; AzF*4x  
   HotKey[index]=cKey; w'A*EWO  
   HotKeyMask[index]=cMask; rir,|y,  
   bAdded=TRUE; [%R?^*]  
   KeyCount++; llR5qq=t  
   break; Gey-8  
  } A^+kA)8  
 } Ix,b-C~  
 return bAdded; 88 X]Uw(+  
} VyN F)$'T  
//删除热键 }Hg\ tj}i  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f/Y7@y  
{ "PElQBLP:  
 BOOL bRemoved=FALSE; 0sKo NzE  
 for(int index=0;index<MAX_KEY;index++){ [ ^\{>m7  
  if(hCallWnd[index]==hWnd){ T+~&jC:{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ H1%o)'Kut4  
    hCallWnd[index]=NULL; Qj1%'wWG  
    HotKey[index]=0; Lg,ObVt!  
    HotKeyMask[index]=0; 0PFC %x  
    bRemoved=TRUE; D4(73  
    KeyCount--; frm[<-~w0  
    break; Yc-5Mr8*,  
   } E&z^E2  
  } YU 0pWM  
 } Iurz?dt4w  
 return bRemoved; BR?DW~7J j  
} v(JjvN21  
*y|w9 r p  
2?Ryk`2i)  
  DLL中的钩子函数如下: U?|A3;,xh  
!BrZTo  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9}2/ko  
{ 3AR'Zvn  
 BOOL bProcessed=FALSE; Gw-{`<CxE  
 if(HC_ACTION==nCode) @oj_E0i3  
 { @XL49D12c  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ~2 XGw9`J2  
   switch(wParam) |5FEsts[  
   {  !,Gavt7f  
    case VK_MENU: `FNU- I4s  
     MaskBits&=~ALTBIT; k5tyOk  
     break; []N&,2O  
    case VK_CONTROL: G@~e :v)  
     MaskBits&=~CTRLBIT; FMn|cO.vEP  
     break; 0QquxYYw,  
    case VK_SHIFT: hUp3$4w  
     MaskBits&=~SHIFTBIT; rVsCJuxI  
     break; i@WO>+iB  
    default: //judge the key and send message 2uY:p=DxG9  
     break; xJ:Am>%\^  
   } ]v@ng8  
   for(int index=0;index<MAX_KEY;index++){ }3XjP55  
    if(hCallWnd[index]==NULL) :4X,5X7tW=  
     continue; wRwx((eb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +kxk z"fP  
    { H3d|eO4+W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); K)`R?CZ:s  
     bProcessed=TRUE; =? q&/ cru  
    } I|Hcs.uW  
   } d/3&3>/  
  } \!uf*=d  
  else if((lParam&0xc000ffff)==1){ //有键按下 )PU\|I0|)e  
   switch(wParam) s/E9$*0  
   { c<cYX;O  
    case VK_MENU: X3gYe-2  
     MaskBits|=ALTBIT; X%iqve"{nB  
     break; wT;;B=u}G  
    case VK_CONTROL: b+ZaZ\-y |  
     MaskBits|=CTRLBIT; _3f/lG?&-  
     break; 1uA-!T*e>  
    case VK_SHIFT: Ly, ];  
     MaskBits|=SHIFTBIT; {O!;cI~  
     break; ^dxy%*Z/  
    default: //judge the key and send message Kb5}M/8  
     break; C5Fq%y{$.  
   } 1ATH$x  
   for(int index=0;index<MAX_KEY;index++){ DX3jE p2  
    if(hCallWnd[index]==NULL) l<sWM$ez  
     continue; \B/( H)Cd*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (lYC2i_b#  
    { l`0JL7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ao2o!-?!t  
     bProcessed=TRUE; GLV`IkU %  
    } G8^b9xoA+.  
   } r`u 9MJ*  
  } ! c~3`7v  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Z,XivU&  
   for(int index=0;index<MAX_KEY;index++){ FEa%wS{  
    if(hCallWnd[index]==NULL) Mwj7*pxUh  
     continue; cx)x="c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) J[K>)@I/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); _A]~`/0;`  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 #LwDs,J:  
   } B]7QOf"  
  } l`JKQk   
 } g8"{smP/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *;t_V laZ  
} n1+J{EPH  
)5;|mV  
  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: _J3\e%ys  
=`gFwH<   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); KHaYb5(a[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u8y('\(  
2@ZuH^qhk  
  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: CFY4PuI"!  
cetlr  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f%YD+Dt_V  
{ <lPHeO<^]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) )=,;-&AR  
 { 6X VJ/qZ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 u`*$EP-%  
  SaveBmp(); c/3]M>+M  
  return FALSE; @(tuE  
 } <("P5@cExU  
 …… //其它处理及默认处理 3URrK[%x`  
} ?nR$>a`  
}T=\hM  
,}Ic($ To  
  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。 AlgVsE%Va  
VD=F{|^  
  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。 n6INI~,  
jLul:* L  
  二、编程步骤 u/?;J1z:  
P(zquKm  
  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"; B"RZpx  
N_.`5I;e  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; _NbhWv  
dFpP_U  
  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; V3\} ]5  
FC8= ru  
  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; N sSl|m  
sWLH"'Z  
  5、 添加代码,编译运行程序。 WOGMt T%  
g[xn0 rG  
三、程序代码 3Q+THg3~?  
qSL~A-  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL KH1/B_.\V  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) X@B,w_b  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ f^XfIH_#  
#if _MSC_VER > 1000 !r0 z3^*N  
#pragma once /lvH p  
#endif // _MSC_VER > 1000 U C9w T  
#ifndef __AFXWIN_H__ W}oAgUd  
#error include 'stdafx.h' before including this file for PCH VoUAFEcs  
#endif C? b_E  
#include "resource.h" // main symbols g\,HiKBXd  
class CHookApp : public CWinApp \3z^/F~  
{ ( e(<4-&  
 public: %G~%:uJ5  
  CHookApp(); =CO#Q$  
  // Overrides "[ ]72PC  
  // ClassWizard generated virtual function overrides af7\2 g3*  
  //{{AFX_VIRTUAL(CHookApp) TWQ{, B  
 public: >E(IkpZ  
  virtual BOOL InitInstance(); *W<g%j-a  
  virtual int ExitInstance(); tZY(r {  
  //}}AFX_VIRTUAL wsfn>w?!V  
  //{{AFX_MSG(CHookApp) 8c'E  
  // NOTE - the ClassWizard will add and remove member functions here. SbpO<8}8  
  // DO NOT EDIT what you see in these blocks of generated code ! Ibl==Irk  
  //}}AFX_MSG j6$_U@)%O  
  DECLARE_MESSAGE_MAP() !Lj+&D|z  
}; [k6 5i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 8DNGqaH;dt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "PPn^{bYm  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E)l@uPA'1  
BOOL InitHotkey(); nbz?D_  
BOOL UnInit(); Rs%6O|u7  
#endif Wj. _{  
c7N`W}BZ  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. T\Q)"GB  
#include "stdafx.h" 8/E?3a_g-  
#include "hook.h" Fop "m/  
#include <windowsx.h> E%+1^ L  
#ifdef _DEBUG l4Y}<j\;  
#define new DEBUG_NEW =zW.~(c{  
#undef THIS_FILE PfVjfrI[  
static char THIS_FILE[] = __FILE__; D(<20b,  
#endif ^?tF'l`  
#define MAX_KEY 100 >?A3;O]  
#define CTRLBIT 0x04 Lv ,Ls  
#define ALTBIT 0x02 (@?PN+68|  
#define SHIFTBIT 0x01 xpVYNS{c+|  
#pragma data_seg("shareddata") $ V"7UA22  
HHOOK hHook =NULL; ojd/%@+u+Y  
UINT nHookCount =0; R|AG N*.  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey O ijG@bI8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT *tT }y(M  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey %.D@{O  
static int KeyCount =0; ve / Q6j{  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift N~ XzgI  
#pragma data_seg() 7nHlDPps)  
HINSTANCE hins; t1 .6+  
void VerifyWindow(); m/0t; cx  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) `795 K8  
//{{AFX_MSG_MAP(CHookApp) QJ s /0iw  
// NOTE - the ClassWizard will add and remove mapping macros here. P A9 ]L  
// DO NOT EDIT what you see in these blocks of generated code! U(=cGA.$  
//}}AFX_MSG_MAP -pR1xsG  
END_MESSAGE_MAP() RyxIJJui  
1]v.Qu<  
CHookApp::CHookApp() U;4:F{3m   
{ U vOB`Vj  
 // TODO: add construction code here, x_ \e&"x  
 // Place all significant initialization in InitInstance @cF aYI  
} N*My2t_+E  
IXf@YV  
CHookApp theApp; Jj'~\j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /Et:',D  
{ #3u;Ox  
 BOOL bProcessed=FALSE; o^},L?  
 if(HC_ACTION==nCode) X Jy]d/  
 { _A \c 6#  
  if((lParam&0xc0000000)==0xc0000000){// Key up (byFr9z  
   switch(wParam) '5eW"HGU]`  
   { Y0U<l1(|  
    case VK_MENU: 4jrY3gyBX  
     MaskBits&=~ALTBIT; q$s0zqV5  
     break; U:xr['  
    case VK_CONTROL: t{K1ht$[:  
     MaskBits&=~CTRLBIT; W6~B~L  
     break; 7@rrAs-"Z  
    case VK_SHIFT: ]pr;ME<M{  
     MaskBits&=~SHIFTBIT; P$D1kcCw  
     break; ?!-2G  
    default: //judge the key and send message  $3%EKi  
     break; I/MYS5}  
   } Zl.}J,0F  
   for(int index=0;index<MAX_KEY;index++){ /'}O-h  
    if(hCallWnd[index]==NULL) )fR'1_  
     continue; o% !a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %Ow,.+m  
    { 1NT@}j~/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); z/N~HSh!d  
     bProcessed=TRUE; 5o2;26c  
    } f|_iHY  
   } Ssr P  
  } 6546"sU  
  else if((lParam&0xc000ffff)==1){ //Key down FbHk6(/)  
   switch(wParam) *}0g~8Gp  
   { R b6` k^  
    case VK_MENU: 0AFjO)  
     MaskBits|=ALTBIT; >e"CpbZ'  
     break; Wgdij11e  
    case VK_CONTROL: j#0@%d  
     MaskBits|=CTRLBIT; &B7X LO[  
     break; uQ{ &x6.1  
    case VK_SHIFT: 2rf-pdOvG  
     MaskBits|=SHIFTBIT; hn-9l1~!h  
     break; TgVvp0F;  
    default: //judge the key and send message m Fwx},dl  
     break; $ T.c>13  
   } FU~ Ip  
   for(int index=0;index<MAX_KEY;index++) 2RidI&?c<  
   {  -}{c;pT  
    if(hCallWnd[index]==NULL) >ZuWsA0q  
     continue; /WB^h6qg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4l E j/#}  
    { u-At k-2M  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); X61]N^y  
     bProcessed=TRUE; %X O97  
    } .T/\5_Bx  
   } vVmoV0kGt  
  } =zt@*o{F  
  if(!bProcessed){ 8AVM(d@  
   for(int index=0;index<MAX_KEY;index++){ *)ZDN~z7o  
    if(hCallWnd[index]==NULL) sV'(y>PP%  
     continue; X4lz?Y:*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) TP[<u-@G  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ! iA0u  
   } Q\Fgc ;.U  
  } +glT5sOk  
 } [&y{z-D>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); o4,W!^ n2  
} kf>oZ*/  
a8FC#kfq  
BOOL InitHotkey() 6+e@)[l.zc  
{ dmW0SK   
 if(hHook!=NULL){ )VID ;l;4  
  nHookCount++; B_anO{3$4  
  return TRUE; &%}6&PW i  
 } 9^<t0oY  
 else S v$%-x^t  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); *f=H#  
  if(hHook!=NULL) 1j "/}0fx  
   nHookCount++; I1S*=^Z_U  
  return (hHook!=NULL); mTT1,|  
} L\XnTL{  
BOOL UnInit() /Zap'S/  
{ 9H$#c_zrq  
 if(nHookCount>1){ oEd+  
  nHookCount--; [*Nuw_l  
  return TRUE; VChNDHiH  
 } )"2)r{7:  
 BOOL unhooked = UnhookWindowsHookEx(hHook); vX;WxA<  
 if(unhooked==TRUE){ #TM+Vd$  
  nHookCount=0; Lf{9=;  
  hHook=NULL; Wqy|Y*$qT  
 } L]3 V)`}  
 return unhooked; +6-c<m|  
} nxkbI:+t  
,&rlt+wE  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;"$Wfy  
{ k*d0ws#<l  
 BOOL bAdded=FALSE; w xKlBx7  
 for(int index=0;index<MAX_KEY;index++){ Jw)Uk< \  
  if(hCallWnd[index]==0){ J wL}|o6  
   hCallWnd[index]=hWnd; GSIRZJl  
   HotKey[index]=cKey; oW3j|V  
   HotKeyMask[index]=cMask; I{U7BZy  
   bAdded=TRUE; gE]6]L  
   KeyCount++; D]\of#%T  
   break; FCnOvF65  
  } $8vZiB!"  
 } ZgK[,<2  
 return bAdded; xr}3vJ7  
} ]KdSwIbi  
iqm]sC`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) VPoA,;Y"-  
{ mD<- <]SYp  
 BOOL bRemoved=FALSE; awkPFA*c'  
 for(int index=0;index<MAX_KEY;index++){ >M=_:52.+  
  if(hCallWnd[index]==hWnd){ PTrKnuM\J_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <fg~+{PA&  
    hCallWnd[index]=NULL; L& ucTc =  
    HotKey[index]=0; ce@1#}*  
    HotKeyMask[index]=0; }W^%5o87{  
    bRemoved=TRUE; >zFk}/  
    KeyCount--; \!M6-kmi  
    break; r#rL~Rsd}  
   } A[:0?Ez=  
  } P0VXHE1p  
 } m/@ ;N,K  
 return bRemoved; !Hq$7j_  
} 2o2jDQ|7  
@6\Id7`Ea  
void VerifyWindow() A!B: vJ  
{ /9T.]H ~  
 for(int i=0;i<MAX_KEY;i++){ _)-t#Ve  
  if(hCallWnd!=NULL){ fUj[E0yOF  
   if(!IsWindow(hCallWnd)){ dt&m YSZ}  
    hCallWnd=NULL; n-zAkKM  
    HotKey=0; T%74JRQ  
    HotKeyMask=0; ~(i#A>   
    KeyCount--; >-U'mkIH  
   } 3L}eF g,d  
  } '. 5&Z  
 } *\Z9=8yK  
} s^f7w  
K#Ia19au5  
BOOL CHookApp::InitInstance() yp}J+/PX}  
{ Buc{dcL/  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); NULew]:5  
 hins=AfxGetInstanceHandle(); |i_+b@Lul  
 InitHotkey(); _y:-_q  
 return CWinApp::InitInstance(); )Fk*'6  
} by07l5  
uCkXzb9_z  
int CHookApp::ExitInstance() e}lF#$  
{ tVfZ~q J  
 VerifyWindow(); ) uM*`%  
 UnInit(); 6Qtyv  
 return CWinApp::ExitInstance(); jW]Q-  
} O-P'Ff"}t  
Td,2.YMQ  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file zF: :?L~  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) M%&1j >d  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ EzII!0 F  
#if _MSC_VER > 1000 0?V{u`*  
#pragma once 0zQ~'x  
#endif // _MSC_VER > 1000 mIW8K ):  
a]H&k$!c  
class CCaptureDlg : public CDialog ^IQtXae6M  
{ DVJuX~'|!  
 // Construction gq%U5J"x;J  
 public: ^wass_8  
  BOOL bTray; qwhDv+o  
  BOOL bRegistered; >EE}P|=-  
  BOOL RegisterHotkey(); R+sv?4k  
  UCHAR cKey; p1F{ v^  
  UCHAR cMask; y{>T['"@  
  void DeleteIcon(); l,fwF ua  
  void AddIcon(); _uXb 9  
  UINT nCount; d1jg3{pwA  
  void SaveBmp(); ql/K$#u  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor )6 U6~!k  
  // Dialog Data q@i>)nC R  
  //{{AFX_DATA(CCaptureDlg) zv .#9^/y  
  enum { IDD = IDD_CAPTURE_DIALOG }; DpCe_Vb%M  
  CComboBox m_Key; F\u]X  
  BOOL m_bControl; *@;bWUJ  
  BOOL m_bAlt; oUl0w~Xn  
  BOOL m_bShift; SI`ems{1>c  
  CString m_Path; /,d]`N!  
  CString m_Number; 6;C2^J@  
  //}}AFX_DATA xe"A;6H  
  // ClassWizard generated virtual function overrides 8u%rh[g'  
  //{{AFX_VIRTUAL(CCaptureDlg) 8Y"R@'~  
 public: E]w2 {%  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ?_-5W9  
 protected: sA~Ijg"6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <) cJz  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); \B4f5 L8k  
  //}}AFX_VIRTUAL 9y'To JZ6  
  // Implementation n  +v(t  
 protected: |zbM$37 ?k  
  HICON m_hIcon; *j~ObE_y  
  // Generated message map functions -e\OF3 Td  
  //{{AFX_MSG(CCaptureDlg) B/Js>R  
  virtual BOOL OnInitDialog(); 7Y?59 [  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); bV$g]->4e  
  afx_msg void OnPaint(); uK%0,!q  
  afx_msg HCURSOR OnQueryDragIcon(); ?%cZO "  
  virtual void OnCancel(); g& ou[_A  
  afx_msg void OnAbout(); /Qu<>#[?  
  afx_msg void OnBrowse(); L,yq'>*5s  
  afx_msg void OnChange(); U(+%iD60i  
 //}}AFX_MSG g '+2bQ  
 DECLARE_MESSAGE_MAP() :jy}V'bn$  
}; BN&eU'Dl]  
#endif ! FVD_8  
_BEDQb{"|  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file x.9[c m-!  
#include "stdafx.h" yxtfyf|9 '  
#include "Capture.h" I!"/I8Y  
#include "CaptureDlg.h" 6&"*{E  
#include <windowsx.h> i"0*)$ h W  
#pragma comment(lib,"hook.lib") lSfPOx;*  
#ifdef _DEBUG =}" P;4:  
#define new DEBUG_NEW nt%fJ k  
#undef THIS_FILE /2Z7  
static char THIS_FILE[] = __FILE__; ')T*cLQ><  
#endif ]`q]\EH  
#define IDM_SHELL WM_USER+1 y*Gq VA[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^V~^[Yp  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); mg< v9#  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ov5g`uud  
class CAboutDlg : public CDialog )gx*;z@  
{ t*`G@Nj  
 public: )EK\3q  
  CAboutDlg(); S c ijf 9  
  // Dialog Data ai<K6)  
  //{{AFX_DATA(CAboutDlg) 33ZHrZ  
  enum { IDD = IDD_ABOUTBOX }; Jt:)(&-t   
  //}}AFX_DATA 3, 3n  
  // ClassWizard generated virtual function overrides B qo#cnlG  
  //{{AFX_VIRTUAL(CAboutDlg) G%junS'zt  
 protected: as73/J6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ec,Bu7'8  
  //}}AFX_VIRTUAL \=[38?QOY  
  // Implementation Xyu0n p;@  
 protected: (QdLz5\  
  //{{AFX_MSG(CAboutDlg) [s[!PlazX  
  //}}AFX_MSG )xL_jSyh  
  DECLARE_MESSAGE_MAP() cm8co  
}; g,G{%dGsk  
| 2GrOM&S  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ewdcAF5  
{ hh$i1n  
 //{{AFX_DATA_INIT(CAboutDlg) 4}Y? :R  
 //}}AFX_DATA_INIT ?Ld:HE  
} >[N6_*K]  
cJ>^@pd{  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) sC ?e%B  
{ sY[!=`@  
 CDialog::DoDataExchange(pDX); Ax 4R$P.]u  
 //{{AFX_DATA_MAP(CAboutDlg) ~<}?pDA}~  
 //}}AFX_DATA_MAP o{' J O3  
} /eBcPu"[Vb  
? <w[ZWytm  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 'JO}6 ;W  
 //{{AFX_MSG_MAP(CAboutDlg) |fb*<o eT  
 // No message handlers a# Uk:O!  
 //}}AFX_MSG_MAP g2vt(Gf;  
END_MESSAGE_MAP() &Z}}9dd  
pf#R]  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Abpzf\F  
: CDialog(CCaptureDlg::IDD, pParent) kaRjv   
{ *c( J4  
 //{{AFX_DATA_INIT(CCaptureDlg) s]HJcgI  
  m_bControl = FALSE; Gx|/ Jq  
  m_bAlt = FALSE; #4AqWyp#f  
  m_bShift = FALSE; .G}$jO}  
  m_Path = _T("c:\\"); vos-[$  
  m_Number = _T("0 picture captured."); !-7<x"avm  
  nCount=0; {M23a _t\  
  bRegistered=FALSE; A&d_! u>  
  bTray=FALSE; BA9;=orx  
 //}}AFX_DATA_INIT Pk8(2fAYk  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 CX7eCo  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); -5\.\L3y)  
} {;38&Izwz  
QvzE:]pyi  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Q@TeU#2Y  
{ z-|d/#h  
 CDialog::DoDataExchange(pDX); 2{G7ignv  
 //{{AFX_DATA_MAP(CCaptureDlg) aw3rTT(  
  DDX_Control(pDX, IDC_KEY, m_Key); R_IT${O  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); wh3Wuh?x  
  DDX_Check(pDX, IDC_ALT, m_bAlt); h  m(  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); BO 3z$c1yU  
  DDX_Text(pDX, IDC_PATH, m_Path); ^C8f(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); -}5dZ;  
 //}}AFX_DATA_MAP 0 d2to5 (  
} OSK:Cb.-?F  
i;J*9B_U  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) V'AZs;  
//{{AFX_MSG_MAP(CCaptureDlg) cMfnc.P\K  
 ON_WM_SYSCOMMAND() bR=TGL&  
 ON_WM_PAINT() Z"G?+gM@  
 ON_WM_QUERYDRAGICON() ^.[+)0I  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) .Pa6HA !  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse)  rjHW  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Tt{ft?H71  
//}}AFX_MSG_MAP +H _ /  
END_MESSAGE_MAP() 3H5<w4yk  
7': <I- Fm  
BOOL CCaptureDlg::OnInitDialog() <*opVy^  
{ %%Wn:c>  
 CDialog::OnInitDialog(); 1k)`C<l  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); VjSA& R  
 ASSERT(IDM_ABOUTBOX < 0xF000); s3)T}52  
 CMenu* pSysMenu = GetSystemMenu(FALSE); >kV=h?]Y  
 if (pSysMenu != NULL) H"rIOoxf  
 { Bs-MoT!  
  CString strAboutMenu; ^p~3H  
  strAboutMenu.LoadString(IDS_ABOUTBOX); (!<G` ;}u  
  if (!strAboutMenu.IsEmpty()) =Y R+`[bfI  
  { EkP(] F  
   pSysMenu->AppendMenu(MF_SEPARATOR); &^ =Y76  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); "oCXG`.k&  
  } B)ibxM(n*  
 } %U$%x  
 SetIcon(m_hIcon, TRUE); // Set big icon (P nrY~9  
 SetIcon(m_hIcon, FALSE); // Set small icon =(,dI [v  
 m_Key.SetCurSel(0); \'x?VVw  
 RegisterHotkey(); ~ [=2d a  
 CMenu* pMenu=GetSystemMenu(FALSE); T) cbpkH4  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); gk"J+uM  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); `"|u NVn  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ="[6Z$R  
 return TRUE; // return TRUE unless you set the focus to a control m6 a @Y<  
} R(A"6a8*  
,,(BW7(  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) SVT'fPm1M  
{ }/z\%Y  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) wk6tdY{&s  
 { u=B,i#>s  
  CAboutDlg dlgAbout; _lG\_6oJ,  
  dlgAbout.DoModal(); NZ~"2~Hh  
 } #]Q.B\\  
 else K-7i4 ~  
 { G;bE_O  
  CDialog::OnSysCommand(nID, lParam); Y.8mgy>   
 } mr`EcO0  
} zC$(/nZ  
a~;`&Uj  
void CCaptureDlg::OnPaint() xwrleB  
{ r/6h}  
 if (IsIconic()) Z65]|  
 { Fy]j33E  
  CPaintDC dc(this); // device context for painting 2a:JtJLl  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); CFx$r_!~  
  // Center icon in client rectangle  4K$d%  
  int cxIcon = GetSystemMetrics(SM_CXICON); w24@KaKFo  
  int cyIcon = GetSystemMetrics(SM_CYICON); xr 4kBC t  
  CRect rect; 31}kNc}n  
  GetClientRect(&rect); zI3Bb?4.  
  int x = (rect.Width() - cxIcon + 1) / 2; )V*V  
  int y = (rect.Height() - cyIcon + 1) / 2; U*Pi%J  
  // Draw the icon Yc1ve  
  dc.DrawIcon(x, y, m_hIcon); }Z\PE0  
 } 0Bhf(5  
 else Q u@T}Ci  
 { n>I NJ  
  CDialog::OnPaint(); *.Ceb%W7C  
 } T>s3s5Y  
} JIU=^6^2'  
R>. %0%iq  
HCURSOR CCaptureDlg::OnQueryDragIcon() `}f wR  
{ qQ UCK  
 return (HCURSOR) m_hIcon; 38eeRo  
} +tPqU6  
[0mg\n?  
void CCaptureDlg::OnCancel() Mi_/ ^  
{ \py \rI  
 if(bTray) fP:g}Z  
  DeleteIcon(); ) %&~CW+  
  CDialog::OnCancel(); xA2 "i2k9  
} ,_2ZKO/k$  
;-X5#  
void CCaptureDlg::OnAbout() + %07J6  
{ ln6Hr^@5  
 CAboutDlg dlg; `>cBR,)r  
 dlg.DoModal(); S&YC"  
} KPSHBv-#  
];1Mg  
void CCaptureDlg::OnBrowse() m`Ver:{  
{ 8z h{?0  
 CString str; ri k0F  
 BROWSEINFO bi; $Y5m"wySZ  
 char name[MAX_PATH]; d% :   
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /^<Uy3F[p  
 bi.hwndOwner=GetSafeHwnd(); [q{[Avqf  
 bi.pszDisplayName=name; S( r Fa  
 bi.lpszTitle="Select folder"; u4a(AB>S  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 8/dx)*JCq  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); qKg*/)sD(  
 if(idl==NULL) 5L4{8X0X8  
  return; 3KW4 ]qo~  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); gK8{=A0c  
 str.ReleaseBuffer(); zn'F9rWx>  
 m_Path=str; F"<TV&xf  
 if(str.GetAt(str.GetLength()-1)!='\\') &{c.JDO  
  m_Path+="\\"; hf~'EdU  
 UpdateData(FALSE); GF-\WD  
} P[E5e+ A)  
aqk0+  
void CCaptureDlg::SaveBmp() '=2/0-;Jf  
{ a.yCd/  
 CDC dc; 2=PX1kI  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); tmJ-2  
 CBitmap bm; ^%?*u;uU%  
 int Width=GetSystemMetrics(SM_CXSCREEN); OF)G 2>t  
 int Height=GetSystemMetrics(SM_CYSCREEN); '-7rHx  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Ej]:j8^W  
 CDC tdc; -6OgM}  
 tdc.CreateCompatibleDC(&dc); +(-L  
 CBitmap*pOld=tdc.SelectObject(&bm); ZCAdCKX|  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); kgV_*0^  
 tdc.SelectObject(pOld); eJ JD'Z  
 BITMAP btm; rv\m0*\<  
 bm.GetBitmap(&btm); N1 }#6YNw  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ;5bzXW#U  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $ &Ntdn  
 BITMAPINFOHEADER bih; fvDt_g9oI  
 bih.biBitCount=btm.bmBitsPixel; pp#xN/V#a  
 bih.biClrImportant=0; ~<?+(V^D  
 bih.biClrUsed=0; ,33[/j  
 bih.biCompression=0; D!- 78h  
 bih.biHeight=btm.bmHeight; dC7YVs_,#  
 bih.biPlanes=1; $-}a<UFE;  
 bih.biSize=sizeof(BITMAPINFOHEADER); .m]"lH*  
 bih.biSizeImage=size; %&RF;qa2xu  
 bih.biWidth=btm.bmWidth; `H.~ # $  
 bih.biXPelsPerMeter=0; -<[MM2Y  
 bih.biYPelsPerMeter=0; j<-#a^jb  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); mu[:b  
 static int filecount=0; msyC."j0jU  
 CString name; ;p !|E3o.  
 name.Format("pict%04d.bmp",filecount++);  0#AS>K5  
 name=m_Path+name; F?wfh7q  
 BITMAPFILEHEADER bfh; /7 CF f&4  
 bfh.bfReserved1=bfh.bfReserved2=0; d@a FW  
 bfh.bfType=((WORD)('M'<< 8)|'B'); O"$uw  
 bfh.bfSize=54+size; y\Z$8'E5W  
 bfh.bfOffBits=54; 5*ip}wA  
 CFile bf; [zO:[i 7  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 9Q<8DMX^  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); WPmH4L>T  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `m.).Hda  
  bf.WriteHuge(lpData,size); =o@CCUKpj  
  bf.Close(); 'edd6yTd  
  nCount++; RpAqnDX)  
 } L|wD2iw  
 GlobalFreePtr(lpData); -_bnGY%,  
 if(nCount==1) *f[nge&.  
  m_Number.Format("%d picture captured.",nCount); G^`IfF-j  
 else sw={bUr6G`  
  m_Number.Format("%d pictures captured.",nCount); Li jisE  
  UpdateData(FALSE); QgZwU$`p0  
} o"te7nBI  
"%o,P/<X  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) :ub 4p4h*  
{ OD*\<Sc  
 if(pMsg -> message == WM_KEYDOWN) csceu+ IA  
 { ;#F/2UgHB  
  if(pMsg -> wParam == VK_ESCAPE) #mI{D\UR  
   return TRUE; 5/vfmDt3'G  
  if(pMsg -> wParam == VK_RETURN) INi9`M.h  
   return TRUE; CWP),]#n  
 } o=t@83Fh5  
 return CDialog::PreTranslateMessage(pMsg); \>T+\?M  
} `OL@@`'^{S  
Xu4C*]A>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) g>m)|o'  
{ _6b?3[Xz  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \{Q d  
  SaveBmp(); Kw`{B3"  
  return FALSE; 0W92Z@_GY  
} ,cgFdOM.  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ e;+6U"Jx*  
 CMenu pop; n9 LTrhLqp  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); x)Y?kVw21"  
 CMenu*pMenu=pop.GetSubMenu(0); iP7 Cku}l  
 pMenu->SetDefaultItem(ID_EXITICON); 5s=ZA*(sY  
 CPoint pt; CFm( yFk  
 GetCursorPos(&pt); q&/<~RC*  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); q#{.8H-X'  
 if(id==ID_EXITICON) vD=>AAvG  
  DeleteIcon(); mv5=>Xc6  
 else if(id==ID_EXIT) +VJS/  
  OnCancel(); ! :[`>=!  
 return FALSE; :bh#,]'  
} a.n;ika]-  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); FeW}tKH  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) @%(Vi!Cv"R  
 AddIcon(); SdOa#U)  
 return res; )\ `AD#  
} +3a} ~pW  
BHVC&F*>  
void CCaptureDlg::AddIcon() y&ZyThqg  
{ B3+9G,or  
 NOTIFYICONDATA data; [y(DtOR  
 data.cbSize=sizeof(NOTIFYICONDATA); -8HK_eQn  
 CString tip; Dl a }-A:  
 tip.LoadString(IDS_ICONTIP); #\|Ac*>  
 data.hIcon=GetIcon(0); 6x'F0{U  
 data.hWnd=GetSafeHwnd(); <Km ^>9  
 strcpy(data.szTip,tip); ~4 ~c+^PF  
 data.uCallbackMessage=IDM_SHELL; TY."?` [FK  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 7L%JCH#F  
 data.uID=98; Nl4,c[$C  
 Shell_NotifyIcon(NIM_ADD,&data); -0QoVGw  
 ShowWindow(SW_HIDE); b^*9m PP  
 bTray=TRUE; #?OJ9pyG'  
} *oby(D"p  
{8TLL @T4  
void CCaptureDlg::DeleteIcon() iS p +~  
{ R[C+?qux  
 NOTIFYICONDATA data; Kyf,<z F  
 data.cbSize=sizeof(NOTIFYICONDATA); e=>:(^CS   
 data.hWnd=GetSafeHwnd(); 1@dB*Jt  
 data.uID=98; #x?Ku\ts  
 Shell_NotifyIcon(NIM_DELETE,&data); )8cb @N  
 ShowWindow(SW_SHOW); K nl`[Nl  
 SetForegroundWindow(); T*Dd% f  
 ShowWindow(SW_SHOWNORMAL); * ~D|M  
 bTray=FALSE; |r U?  
} $U_M|Xa  
M_I.Y1|  
void CCaptureDlg::OnChange() *1H8 &  
{ Ulf'gD4e  
 RegisterHotkey(); `D%U5Jb  
} 3`JLb]6  
m4 k:uk7N  
BOOL CCaptureDlg::RegisterHotkey() 0N|l1Sn  
{ LD=eMk: ~  
 UpdateData(); 5NR@<FE  
 UCHAR mask=0; H[S}&l\D4  
 UCHAR key=0; ,QeJ;U  
 if(m_bControl) -> ^Ex`  
  mask|=4; _Gu;=H,~&  
 if(m_bAlt) w4nU86oZYl  
  mask|=2; Y>/T+ub  
 if(m_bShift) (-no`j  
  mask|=1; 5}3#l/  
  key=Key_Table[m_Key.GetCurSel()]; P<%}!Y  
 if(bRegistered){ W\c1QY$E  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); _o52#Q4   
  bRegistered=FALSE; %(uYYr 6  
 } xekU2u}WE  
 cMask=mask; jIL+^{K<  
 cKey=key; &KYPi'C9!z  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (# c|San  
 return bRegistered; &G|^{!p/G  
} [u $X.=(  
dwpE(G y6c  
  四、小结 RoFOjCc>D.  
tEN8S]X  
  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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