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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: !Bb^M3iA  
  );V.le}%(  
  一、实现方法 B%KfB VC  
4NmLbM&C8  
  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: ?rgtbiSW-  
(e[8`C  
#pragma data_seg("shareddata") 6"jV>CNc@  
HHOOK hHook =NULL; //钩子句柄 AM4 :xz  
UINT nHookCount =0; //挂接的程序数目 :Pi="  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 IsB=G-s  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 FeuqqZ\=&  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey <0H^2ekd  
static int KeyCount =0; 'E#Bz"T  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1  x5W. 3*  
#pragma data_seg() !a9/8U_>XF  
>66v+  
  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。 @Yh%.#\i%  
&, WQr  
  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: }%k 3  
|(rTz!!-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR -{S: sK.o  
cKey,UCHAR cMask) Y kcN-  
{ =BBDh`$R  
 BOOL bAdded=FALSE; &e1(|qax  
 for(int index=0;index<MAX_KEY;index++){ R}\n @X*  
  if(hCallWnd[index]==0){ z4*`K4W  
   hCallWnd[index]=hWnd; k54Vh=p  
   HotKey[index]=cKey; 1WLaJ%Fv  
   HotKeyMask[index]=cMask; B}Sl1)E  
   bAdded=TRUE; VY'1 $  
   KeyCount++; *W=R:Bl!  
   break; C2W&*W*  
  } 5KwT(R o  
 } %8T"h  
 return bAdded; !Ytr4DtM  
} +[$ Q C*  
//删除热键 nL&[R}@W  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f;%\4TH?  
{ #N `Z)}Jm  
 BOOL bRemoved=FALSE; @(LEuYq}  
 for(int index=0;index<MAX_KEY;index++){ @wOX</_g  
  if(hCallWnd[index]==hWnd){ CqbPUcK  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ OqA#4h4^  
    hCallWnd[index]=NULL; :LBRyBV  
    HotKey[index]=0; aak[U;rx  
    HotKeyMask[index]=0; tD\%SiTg=b  
    bRemoved=TRUE; RJT=K{2x  
    KeyCount--; |fg{Fpc  
    break; uY Y{M`  
   } %v 1NDhaXz  
  } 53X5&Bwh  
 } ':_1z5  
 return bRemoved; SpiI9)gp  
} 3+2cD  
P+[\9Gg  
8iwqy0<  
  DLL中的钩子函数如下: tJ!s/|u(  
NU$?BiB?R  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8^6dK  
{ 8!u8ZvbFG  
 BOOL bProcessed=FALSE; mA>u6Rlc  
 if(HC_ACTION==nCode) y(0";\V  
 { $oU40HA)W]  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 {9*k \d/;  
   switch(wParam) @`Foy  
   {  ]-G10p}Ph-  
    case VK_MENU: !L_\6;aP,x  
     MaskBits&=~ALTBIT; 7!"OF  
     break; q\a'pp9d  
    case VK_CONTROL: _qQB.Dzo:  
     MaskBits&=~CTRLBIT; *T{P^q.s~[  
     break; .YcI .  
    case VK_SHIFT: x*2'I  
     MaskBits&=~SHIFTBIT; !/Wp0E'A  
     break; 6Cd% @Q2cr  
    default: //judge the key and send message %>Y86>mVz  
     break; ]S#m o  
   } h#!u"'JW  
   for(int index=0;index<MAX_KEY;index++){ E;Sb e9]   
    if(hCallWnd[index]==NULL) l d4#jV ei  
     continue; -<Zs7(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) S8$kxQg  
    { p?,:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); R#UcwX}o  
     bProcessed=TRUE; fd} U l  
    } |T@\ -8Ok  
   } ^+20e3 ~Y  
  } 1JXa/f+  
  else if((lParam&0xc000ffff)==1){ //有键按下 _.y0 QkwV  
   switch(wParam) W bW@V_rr  
   { bhWH  
    case VK_MENU: WYklS<B[  
     MaskBits|=ALTBIT; ]5}C@W@_  
     break; 251^>x.R  
    case VK_CONTROL: DYKJVn7w  
     MaskBits|=CTRLBIT; \$] V#@F  
     break; ow{SsX  
    case VK_SHIFT: k{q4Zz[  
     MaskBits|=SHIFTBIT; <i(<|/ $  
     break; W{!GL  
    default: //judge the key and send message Eax^1 |6  
     break; ni$S@0  
   } 6(uK5eD(!n  
   for(int index=0;index<MAX_KEY;index++){ UfUboxT  
    if(hCallWnd[index]==NULL) g-Y2U}&  
     continue; Zw`vPvb!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vhQIkB8  
    { Rg!Fu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]c'12 g]h  
     bProcessed=TRUE; E1uyMh-dy  
    } d!i#@XZ^  
   } -0/5 !  
  } [j]3='2}G  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 v8>?,N#  
   for(int index=0;index<MAX_KEY;index++){ ~\^h;A'3  
    if(hCallWnd[index]==NULL) u'BuZF  
     continue; :"4Pr/}rT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) c{dge/2yb  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |*+f N8  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 2HemPth  
   } 8- U1Y  
  } Qwm#6{5  
 } D< h+r?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); hS}d vZa  
} }I1SC7gY  
RS>;$O_(M  
  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: 1k *gbXb  
Uz`K#Bz   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NBUSr}8|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); CAhkv0?8  
Gw5j6  
  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: _*SA_.0  
Gw/imXL  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m.}Yn,  
{ 5g{F-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) :bhpYEUMx  
 { Rt[zZv  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 t'@qb~sf  
  SaveBmp(); !u0qF!/W  
  return FALSE; VQQtxHTC3  
 } $]Vvu{  
 …… //其它处理及默认处理 5zqlK-$  
} ;%j1'VI  
_rz*7-ks=  
<{"]&bl  
  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。 El}."}l&  
=D2jJk?AX  
  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。 .9<  i  
JIl<4 %A  
  二、编程步骤 %$)[qa3  
d3$&I==;:  
  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"; YtzB/q8I  
%)Pn<! L  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; [=63xPxs.  
}T}9AQ}|  
  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; <9]9;   
8KQ]3Z9p  
  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; >0W:snNK  
o<hT/ P  
  5、 添加代码,编译运行程序。 u7oHqo`  
{p{TG5rwX  
三、程序代码 G8y:f%I!b  
Y R2Q6}xR  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 1q])"l"<  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Q!%4Iq%jr  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ "t-u=aDl-.  
#if _MSC_VER > 1000 uz(3ml^S  
#pragma once :jol Nl|a  
#endif // _MSC_VER > 1000 $rAHtr  
#ifndef __AFXWIN_H__ XQW+6LEQ  
#error include 'stdafx.h' before including this file for PCH XF`,mV4  
#endif 7g}lg8M  
#include "resource.h" // main symbols :Kl~hzVSOa  
class CHookApp : public CWinApp JP2zom  
{ |hp_<F9.  
 public: 6[dLj9 G%  
  CHookApp(); Q]Ymv:M,  
  // Overrides G\y:O9(  
  // ClassWizard generated virtual function overrides &B</^:  
  //{{AFX_VIRTUAL(CHookApp) S}/?L m}  
 public: ;^q@w  
  virtual BOOL InitInstance(); *nv%~t   
  virtual int ExitInstance(); 7gLN7_2  
  //}}AFX_VIRTUAL eVobs2s  
  //{{AFX_MSG(CHookApp) 1e 8J-Nkj  
  // NOTE - the ClassWizard will add and remove member functions here. _Ra$"j  
  // DO NOT EDIT what you see in these blocks of generated code ! Vt {uG  
  //}}AFX_MSG H8V${&!ho  
  DECLARE_MESSAGE_MAP() A/XY' 3  
}; 9!u=q5+E  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); jm_b3!J  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {Lex((  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); om`x"x&6  
BOOL InitHotkey(); 3HU_ ~%l  
BOOL UnInit(); vPm&0,R*y:  
#endif +bG^SH2ke  
s~@4  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~w&P]L\dB  
#include "stdafx.h" QEe\1>1"&  
#include "hook.h" }=1#ANM1  
#include <windowsx.h> a@E+/9  
#ifdef _DEBUG bZ-"R 6a$  
#define new DEBUG_NEW #}/YnVk  
#undef THIS_FILE @WV}VKm  
static char THIS_FILE[] = __FILE__; vtvF)jlX  
#endif "ooq1 0P  
#define MAX_KEY 100 r[ UZHX5+S  
#define CTRLBIT 0x04 .Ulrv5wJ  
#define ALTBIT 0x02  As&=Pb9  
#define SHIFTBIT 0x01 +1Qa7 \  
#pragma data_seg("shareddata") 5J d7<AO_  
HHOOK hHook =NULL; *} pl  
UINT nHookCount =0; tOJK~%'  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ,t`u3ykh  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Y:GSjq  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Qi 3di  
static int KeyCount =0; ^xW u7q  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift }@kD&2  
#pragma data_seg() aZ[ aZU  
HINSTANCE hins; 1:7 uS.  
void VerifyWindow(); +d7sy0  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) PSOW}Y|q  
//{{AFX_MSG_MAP(CHookApp) SLzxF uV  
// NOTE - the ClassWizard will add and remove mapping macros here. 8 JOfx  
// DO NOT EDIT what you see in these blocks of generated code! tE i-0J  
//}}AFX_MSG_MAP E?{{z4  
END_MESSAGE_MAP() ?;s}GpEY:  
6TN!63{Cz  
CHookApp::CHookApp() ^BDM'  
{ a J%&Y5L  
 // TODO: add construction code here, N7S?m@  
 // Place all significant initialization in InitInstance RoV^sbWFt  
} n"[VM=YGI  
*Nv!Kuk  
CHookApp theApp; cs'ylGH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Q9-o$4#R[  
{ &d"c6il[  
 BOOL bProcessed=FALSE; X2X.&^  
 if(HC_ACTION==nCode) zh5$$*\  
 { ]g#ur@Y%  
  if((lParam&0xc0000000)==0xc0000000){// Key up |'w_5?|4  
   switch(wParam) K4]42#  
   { 8<,b5  
    case VK_MENU: PNm WZW*  
     MaskBits&=~ALTBIT; >EVlMt27'  
     break; c4]/{!4 Q  
    case VK_CONTROL: "A_,Ga  
     MaskBits&=~CTRLBIT; ]2^tV.^S^  
     break; \E9Hk{V:6  
    case VK_SHIFT: +Dg%ec  
     MaskBits&=~SHIFTBIT; XCQS_'D  
     break;  U>0' K3_  
    default: //judge the key and send message 80PlbUBb!  
     break; 9.<dS  
   } :)!X%2 _  
   for(int index=0;index<MAX_KEY;index++){ yZ {H  
    if(hCallWnd[index]==NULL) Ee&A5~  
     continue; (&n4^tJ+_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ls5s}X  
    { -JL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); m7zx,bz>  
     bProcessed=TRUE; ooJ ^8L  
    } $~h\8  
   } x"hZOgFZ  
  } +-b:XeHSZ  
  else if((lParam&0xc000ffff)==1){ //Key down ?y.q<F)  
   switch(wParam) h8IjTd]z{$  
   { "qL4D4  
    case VK_MENU: [iJU{W  
     MaskBits|=ALTBIT; Hwr# NKz-  
     break; 1J}i :i&  
    case VK_CONTROL: )_*<uSl  
     MaskBits|=CTRLBIT; d2b  L_  
     break; Vb${Oy+  
    case VK_SHIFT: PQl a-  
     MaskBits|=SHIFTBIT; Mx ?{[zT"  
     break; Sq9I]A  
    default: //judge the key and send message \/rK0|2A  
     break; nWTo$*>W  
   } HOWm""IkB  
   for(int index=0;index<MAX_KEY;index++) S@AHI!"h=V  
   { g[VVxp!C<  
    if(hCallWnd[index]==NULL) R<}WNZl  
     continue; E0K'|*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <E2+P,Lgw  
    { P4"Pb\o*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); B7:8%r/  
     bProcessed=TRUE; *gu4%  
    } em^|E73  
   } j@4 yRl ^  
  } ]Y#$!fIx  
  if(!bProcessed){ txF)R[dZK  
   for(int index=0;index<MAX_KEY;index++){ `;[ j`v8O  
    if(hCallWnd[index]==NULL) JCjQR`)  
     continue; uZsm=('ww  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) UlBg6   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); s?;rP,{:p  
   } b9M.p*!  
  } 2o0.ttBAqZ  
 } 0\ G`AO;D  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); V=<OV]0  
} Q>\y%&df  
HGuY-f  
BOOL InitHotkey() A;e[-5@  
{ !olvP*c"  
 if(hHook!=NULL){ Yjv[rH5v  
  nHookCount++; f wN  
  return TRUE; [4)q6N5`f  
 } gTz66a@i  
 else  &!I^m  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); !V~`e9[rl  
  if(hHook!=NULL) al/3$0#U  
   nHookCount++; {}Y QB'}  
  return (hHook!=NULL); SHw%u~[hu  
} >>lT-w  
BOOL UnInit() hg}Rh  
{ :e-&,K  
 if(nHookCount>1){ l26DPtWi  
  nHookCount--; :t &ib}v  
  return TRUE; lO482l_t  
 } ,vBi)H  
 BOOL unhooked = UnhookWindowsHookEx(hHook); SK2nxZOH  
 if(unhooked==TRUE){ TNs0^h)  
  nHookCount=0; JpVV0x/Q/_  
  hHook=NULL; B_FfXFQm<  
 } }D5*   
 return unhooked; #u8|cs!  
} 5oz[Njq4  
1tvgM !.  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) c5_?jKpl  
{ zV)Ob0M7U  
 BOOL bAdded=FALSE; m?;aTSa  
 for(int index=0;index<MAX_KEY;index++){ po~l8p>  
  if(hCallWnd[index]==0){ +MG(YP/ l  
   hCallWnd[index]=hWnd; ZyE2=w7n  
   HotKey[index]=cKey; K*uFqdLL!  
   HotKeyMask[index]=cMask; k0|*8  
   bAdded=TRUE; h:QKd!Gq  
   KeyCount++; *uYnu|UQH  
   break; q2VQS1R`8  
  } 'jp nQcwxx  
 } w$J0/eX{A  
 return bAdded; 8fpaY{]  
} Xrnxpp!#^D  
iE}jilU  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S[fzy$">  
{ ]A}'jP  
 BOOL bRemoved=FALSE; vt`hY4  
 for(int index=0;index<MAX_KEY;index++){ 6x\+j  
  if(hCallWnd[index]==hWnd){ jd;=5(2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ F^ kH"u[  
    hCallWnd[index]=NULL; 1gp3A  
    HotKey[index]=0; s&S8P;K|  
    HotKeyMask[index]=0; l" y==y  
    bRemoved=TRUE; AL/`Pqlk  
    KeyCount--; EUdu"'=4a  
    break; l[]K5?AS>-  
   } ;EP]A3  
  } @F_#d)+%>  
 } RYMOLX84  
 return bRemoved; J-lQPMI,  
} ARYqX\-e  
41%B%K*  
void VerifyWindow() ^n5[pF}Gw  
{ M70Xdn  
 for(int i=0;i<MAX_KEY;i++){ A:3bL: ;t  
  if(hCallWnd!=NULL){ VNx|nP&  
   if(!IsWindow(hCallWnd)){ 8ID fYJ  
    hCallWnd=NULL; T:Dp+m!\{  
    HotKey=0; )L#C1DP#  
    HotKeyMask=0; >V:g'[b  
    KeyCount--; {t: ZMUV  
   } C)> ])'S  
  } gBRhO^Sz  
 } )f4D2c&VE  
} {N+N4*  
Vm]ltiTVk  
BOOL CHookApp::InitInstance() P>%\pCJ])  
{ S5ka;g  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); gkUG*Zw  
 hins=AfxGetInstanceHandle(); }9fH`C/m  
 InitHotkey(); gH- e0134%  
 return CWinApp::InitInstance(); 0;'kv |  
} \RZFq<6>  
\ief [  
int CHookApp::ExitInstance() +~J?/  
{ -X(%K6{  
 VerifyWindow(); EzY?=<Y(  
 UnInit(); fclmxTy  
 return CWinApp::ExitInstance(); x#"|Z&Dw0  
} E)|_7x<u  
<^VZ4$j  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file HBYqqEO  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) iZ+\vO?|  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ "|pNS)  
#if _MSC_VER > 1000 UM%[UyYQ  
#pragma once cOra`7L`  
#endif // _MSC_VER > 1000 T{u!4Yu  
dwks"5l  
class CCaptureDlg : public CDialog LH.. 8nfl  
{ e47JLW&b  
 // Construction le`&VdE^  
 public: ((rk)Q+;v  
  BOOL bTray; /=4P< &J  
  BOOL bRegistered; yG58?5\9  
  BOOL RegisterHotkey(); #5O'XH5_  
  UCHAR cKey; V%&t'H{  
  UCHAR cMask; [w l:"rm  
  void DeleteIcon(); .['@:}$1  
  void AddIcon(); [6qa"Ie  
  UINT nCount; ~T<#HSR`  
  void SaveBmp(); s)<#a(!  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor J=>?D@K  
  // Dialog Data eSXt"t  
  //{{AFX_DATA(CCaptureDlg) I ,Q"<? &  
  enum { IDD = IDD_CAPTURE_DIALOG }; >L/Rf8j&  
  CComboBox m_Key; aR.1&3fE  
  BOOL m_bControl; 9"R]"v3BA  
  BOOL m_bAlt; O!='U!X@P  
  BOOL m_bShift; xbrxh-gV  
  CString m_Path; Ay<'Z6`  
  CString m_Number; m` cw:  
  //}}AFX_DATA dz.]5R  
  // ClassWizard generated virtual function overrides iC&=-$vu  
  //{{AFX_VIRTUAL(CCaptureDlg) O z%K*  
 public: .z+?b8Q\  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 1&c>v3 $2  
 protected: 8Q^yh6z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }[Uh4k8P  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);  Q^/5hA  
  //}}AFX_VIRTUAL 8^=g$;g  
  // Implementation `(1em%}  
 protected: X"b4U\A  
  HICON m_hIcon; *Id$%O  
  // Generated message map functions wo7.y["$  
  //{{AFX_MSG(CCaptureDlg) ~6@zXHAS  
  virtual BOOL OnInitDialog(); jD3,z*  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 'nI2RX  
  afx_msg void OnPaint(); 0CI?[R\  
  afx_msg HCURSOR OnQueryDragIcon(); I})la!9   
  virtual void OnCancel(); ?HVsIAU  
  afx_msg void OnAbout(); ]CH@ T9d5V  
  afx_msg void OnBrowse(); v vlfL*f  
  afx_msg void OnChange(); {6)fZpd)@  
 //}}AFX_MSG ?ECmPS1  
 DECLARE_MESSAGE_MAP() RH ow%2D  
}; 3tI=? E#  
#endif 8rXq-V_u  
&/R@cS6}'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file B?-RzWB\3  
#include "stdafx.h" dv-yZRU:  
#include "Capture.h" (?xGl V`n  
#include "CaptureDlg.h" qf+jfc(Iby  
#include <windowsx.h> %([$v6y  
#pragma comment(lib,"hook.lib") OYC4iI  
#ifdef _DEBUG JU:!lyd  
#define new DEBUG_NEW WKX5Dl  
#undef THIS_FILE nWN~G  
static char THIS_FILE[] = __FILE__; V4qHaG  
#endif b$[_(QUw  
#define IDM_SHELL WM_USER+1 (.P;VH9R\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); y&9S+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?LgR8/Io@5  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; l9 )iLOj  
class CAboutDlg : public CDialog j>eL&.d  
{ ~j 3B'  
 public: Yqmx]7Y4  
  CAboutDlg(); #NNj#  
  // Dialog Data >joGG T  
  //{{AFX_DATA(CAboutDlg) !798%T  
  enum { IDD = IDD_ABOUTBOX }; p+;Re2Uyg  
  //}}AFX_DATA L@S"c (  
  // ClassWizard generated virtual function overrides +%X_+9bd  
  //{{AFX_VIRTUAL(CAboutDlg) 93 x.b]] "  
 protected: [{N i94:d  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  ?1r@r  
  //}}AFX_VIRTUAL 7GfgW02  
  // Implementation  wxsJB2  
 protected: twt Bt L  
  //{{AFX_MSG(CAboutDlg) lf0/ 0KH  
  //}}AFX_MSG Vv' e,m  
  DECLARE_MESSAGE_MAP() MTb}um.($  
}; PTA;a 0A  
n)} J<  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 8Nxf2i5  
{ q?8MKf[N  
 //{{AFX_DATA_INIT(CAboutDlg) =b32E^z,  
 //}}AFX_DATA_INIT y4VCehdJ  
} D[ 7K2G+  
@S?.`o  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) cZ|D!1%  
{ JwB:NqB  
 CDialog::DoDataExchange(pDX); s6Bt)8A  
 //{{AFX_DATA_MAP(CAboutDlg) NUH;GMj,,  
 //}}AFX_DATA_MAP Y::fcMJr;Q  
} o}v # Df  
\q Q5x  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) KU-z;}9s  
 //{{AFX_MSG_MAP(CAboutDlg) 7oF`Os+U  
 // No message handlers k(=\& T  
 //}}AFX_MSG_MAP N$pwTyk  
END_MESSAGE_MAP() /2>-h-zBjw  
qS&PMQ"$  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) rZu_"bcJ  
: CDialog(CCaptureDlg::IDD, pParent) W euV+}\b  
{ `m3@mJ!>\  
 //{{AFX_DATA_INIT(CCaptureDlg) 90sMS]a  
  m_bControl = FALSE; V==' 7n  
  m_bAlt = FALSE; FtM7+>Do.  
  m_bShift = FALSE; z"}k\B-5  
  m_Path = _T("c:\\"); jm RYL("  
  m_Number = _T("0 picture captured."); X]cB `?vR  
  nCount=0; Lj*F KP\{  
  bRegistered=FALSE; ol!o8M%Q  
  bTray=FALSE; KblOP{I  
 //}}AFX_DATA_INIT kjaz{&P  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 n#z^uq|v  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); |GK [I  
} ^ eM=h  
1GOa'bxm  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) lx$Y-Tb^F  
{ \^Y#"zXo1  
 CDialog::DoDataExchange(pDX); Ep5lm zg  
 //{{AFX_DATA_MAP(CCaptureDlg) vlyq2>TfR  
  DDX_Control(pDX, IDC_KEY, m_Key); (n"  )  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); P7egT,Z  
  DDX_Check(pDX, IDC_ALT, m_bAlt); n,PHfydqX  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ]~?k%Mpw  
  DDX_Text(pDX, IDC_PATH, m_Path); wrqdQ} @(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); &@dMk4BH<  
 //}}AFX_DATA_MAP ,Lv} Xku  
} c::x.B"w  
Lom%eoH)  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 32~Tf,  
//{{AFX_MSG_MAP(CCaptureDlg) 82$By]Y9  
 ON_WM_SYSCOMMAND() eoEb\zJ  
 ON_WM_PAINT() -mY90]g  
 ON_WM_QUERYDRAGICON() $nn~K  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) <g*rTqT'  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) M|n)LyL  
 ON_BN_CLICKED(ID_CHANGE, OnChange) %M}zi'qQ?  
//}}AFX_MSG_MAP rFx2 S  
END_MESSAGE_MAP() /4_}wi\  
*N>Qj-KAM_  
BOOL CCaptureDlg::OnInitDialog() =7e8N&-nv  
{ ^]U2Jd  
 CDialog::OnInitDialog(); !-N!8 0  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); iS=T/<|?  
 ASSERT(IDM_ABOUTBOX < 0xF000); 30DpIkf  
 CMenu* pSysMenu = GetSystemMenu(FALSE); /;OJ=x3i  
 if (pSysMenu != NULL) EHzZ9zH\  
 { '/sc `(`:0  
  CString strAboutMenu; m9L+|r  
  strAboutMenu.LoadString(IDS_ABOUTBOX); H ~ks"D1  
  if (!strAboutMenu.IsEmpty()) M<ad>M  
  { l$zNsf.  
   pSysMenu->AppendMenu(MF_SEPARATOR); ,1~Zqprn  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); //J:p,AF  
  } ]G1j\wnF  
 } t<`ar@}  
 SetIcon(m_hIcon, TRUE); // Set big icon HhqqJEp0  
 SetIcon(m_hIcon, FALSE); // Set small icon DVB:8"Bu  
 m_Key.SetCurSel(0); dtF6IdAf  
 RegisterHotkey(); @%#(Hse  
 CMenu* pMenu=GetSystemMenu(FALSE); kk~{2   
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Lvp/} /H/  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ise@,[!  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); SbGp  
 return TRUE; // return TRUE unless you set the focus to a control V >['~|  
} _I8-0DnOM  
*kKGsy  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9txZ6/  
{ ED?s[K  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) sm_:M| [D  
 { U!e4_JBR'  
  CAboutDlg dlgAbout; I[4E?  
  dlgAbout.DoModal(); y:,{U*49  
 }  R(zsn;  
 else &1Y+ q]  
 { \]9;c6(  
  CDialog::OnSysCommand(nID, lParam); #5H@/o8!s=  
 } EXBfzK)a  
} Iewq?s\Fo  
wZC'BLD  
void CCaptureDlg::OnPaint() ~f@<]  
{ BMdr.0  
 if (IsIconic()) #t/Q4X +  
 { bTiw?i+6Dv  
  CPaintDC dc(this); // device context for painting 5=?&q 'i  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); xS(sRx+A  
  // Center icon in client rectangle TWs|lhC7!  
  int cxIcon = GetSystemMetrics(SM_CXICON); yq<YGNy!  
  int cyIcon = GetSystemMetrics(SM_CYICON); kqyMrZ#  
  CRect rect; t =*K?'ly  
  GetClientRect(&rect); c^bA]l^a  
  int x = (rect.Width() - cxIcon + 1) / 2; }!d}febk_  
  int y = (rect.Height() - cyIcon + 1) / 2; xO.7cSqgw  
  // Draw the icon @i`gR%  
  dc.DrawIcon(x, y, m_hIcon); w+MdQ@'5  
 } }`MO}Pz  
 else 5sE^MS1  
 { {c J6Lq&  
  CDialog::OnPaint(); h)<R#xw  
 } )ld7^G  
} %/^d]#  
#>,cc?H-  
HCURSOR CCaptureDlg::OnQueryDragIcon() 1z`,*eD7  
{ !;xE7w  
 return (HCURSOR) m_hIcon; }Sh-4:-D  
} ?k3b\E3  
x$Dv&4  
void CCaptureDlg::OnCancel() */\.-L{h  
{ 869`jA &7"  
 if(bTray) c !;wp,c  
  DeleteIcon(); x:bYd\ EJ[  
  CDialog::OnCancel(); <VBw1|)$@  
} gON6jnDO  
{c1qC zM4  
void CCaptureDlg::OnAbout() |`okIqp  
{ 4ku/3/ 6  
 CAboutDlg dlg; ex=~l O  
 dlg.DoModal(); 7 dzE"m  
} [x)e6p)  
OMZT\$9yT  
void CCaptureDlg::OnBrowse() 4tC_W!?$t  
{ g}D$`Nx:  
 CString str; K@i*Nl  
 BROWSEINFO bi; 0l##M06>  
 char name[MAX_PATH]; aE%VH ;?  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); H|Nw)*.  
 bi.hwndOwner=GetSafeHwnd(); "5YdmBy  
 bi.pszDisplayName=name; LBE".+  
 bi.lpszTitle="Select folder"; k|_2aQ02  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; "4`%NA  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <oO,CXF  
 if(idl==NULL) G<z)Ydh_  
  return; @Dy.HQ~  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ;FmSL#]I  
 str.ReleaseBuffer(); wY95|QS  
 m_Path=str; d"78:+  
 if(str.GetAt(str.GetLength()-1)!='\\') y(dS1.5F  
  m_Path+="\\"; +doT^&2u*  
 UpdateData(FALSE); \PFx# :-c  
} |W <:rT  
/Ow?nWSt  
void CCaptureDlg::SaveBmp() k$c j|-<  
{ gctaarB&  
 CDC dc; Cm4 *sN.&)  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); A1q^E(}O  
 CBitmap bm; P&GZe/6Y  
 int Width=GetSystemMetrics(SM_CXSCREEN); p4t)Z#0  
 int Height=GetSystemMetrics(SM_CYSCREEN); sfV.X:ev  
 bm.CreateCompatibleBitmap(&dc,Width,Height); =l(JJ  
 CDC tdc; m@@QT<  
 tdc.CreateCompatibleDC(&dc); HFr3(gNj@  
 CBitmap*pOld=tdc.SelectObject(&bm); Wy4^mOv  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); >S!DIL  
 tdc.SelectObject(pOld); E1C_d'  
 BITMAP btm; NM@An2  
 bm.GetBitmap(&btm); ) b10%n^  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; [*G2wP[$  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Fjzk;o  
 BITMAPINFOHEADER bih; @>]3xHE6#=  
 bih.biBitCount=btm.bmBitsPixel; ~D5MAEazS  
 bih.biClrImportant=0; `/zt&=`VB  
 bih.biClrUsed=0; %Let AR  
 bih.biCompression=0; 2FzS_\":I  
 bih.biHeight=btm.bmHeight; RV` j>1  
 bih.biPlanes=1; =M 5M;  
 bih.biSize=sizeof(BITMAPINFOHEADER); P1wRt5  
 bih.biSizeImage=size; H1nQ.P]_  
 bih.biWidth=btm.bmWidth; vR$5ItnT  
 bih.biXPelsPerMeter=0; &w0=/G/T=~  
 bih.biYPelsPerMeter=0; kKM%    
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); F 29AjW86  
 static int filecount=0; )0mDN.  
 CString name; ?U08A{ c  
 name.Format("pict%04d.bmp",filecount++); :Y>] 6  
 name=m_Path+name; At(9)6n8  
 BITMAPFILEHEADER bfh; [QbXj0en$  
 bfh.bfReserved1=bfh.bfReserved2=0; .Qt3!ek  
 bfh.bfType=((WORD)('M'<< 8)|'B'); r%pFq1/'!  
 bfh.bfSize=54+size; v|@n8ED|@K  
 bfh.bfOffBits=54; C8:"+;  
 CFile bf; YZRB4T9  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 9/Dt:R3QU  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); v{n}%akc  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); od1omYsR  
  bf.WriteHuge(lpData,size); 1`lFF_stkP  
  bf.Close(); ~,2hP ~  
  nCount++; V^I /nuy  
 } t5X lR]` w  
 GlobalFreePtr(lpData); ]?(F'&  
 if(nCount==1) n-3j$x1Ne  
  m_Number.Format("%d picture captured.",nCount); wG5RN;`V  
 else kA!(}wRL  
  m_Number.Format("%d pictures captured.",nCount); K<6x4ha  
  UpdateData(FALSE); %uVJL z  
} Lc<xgN+cJ  
/dt!J `:  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) L5 9oh  
{ |ozoc"'  
 if(pMsg -> message == WM_KEYDOWN) 6;frIl;  
 { WgJAr73 l  
  if(pMsg -> wParam == VK_ESCAPE) q_y,j&  
   return TRUE; DXW?;|8)O  
  if(pMsg -> wParam == VK_RETURN) 7/_ VE  
   return TRUE; qYZ7Zt;  
 } Q5nyD/k4c  
 return CDialog::PreTranslateMessage(pMsg); 3D{4vMm X  
} ^:DhHqvK  
Pmlgh&Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gvqd 1?0w  
{ 07Q[L'}y@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ "P5bYq%0v  
  SaveBmp(); $H-D9+8 7  
  return FALSE; 1{x~iZa  
} ZT"|o\G^Q  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 7. 9s.*  
 CMenu pop; ynZ[c8.  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;K\N  
 CMenu*pMenu=pop.GetSubMenu(0); C6UMc} 9h  
 pMenu->SetDefaultItem(ID_EXITICON); >Y-TwD aE  
 CPoint pt; V/}>>4  
 GetCursorPos(&pt); qzt2j\v  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); I"32[?0 (;  
 if(id==ID_EXITICON) ESxC{ "  
  DeleteIcon(); /~l/_Jct@G  
 else if(id==ID_EXIT) }&T<wm!  
  OnCancel(); Of7) A  
 return FALSE; I49l2>  
} {L4>2rF  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); t9n   
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) j22#Bw  
 AddIcon(); OZ!$%.?l  
 return res; L\Fu']l  
} Fy@#r+PgWp  
nj^q@h  
void CCaptureDlg::AddIcon() ccn`f]5w  
{ R #3Q$   
 NOTIFYICONDATA data; m>+,^`0  
 data.cbSize=sizeof(NOTIFYICONDATA); R g0 XW6  
 CString tip; \W`}L  
 tip.LoadString(IDS_ICONTIP); J'ZFIT_>  
 data.hIcon=GetIcon(0); SXBQ  
 data.hWnd=GetSafeHwnd(); 6+ $d  
 strcpy(data.szTip,tip); KtU GI.X  
 data.uCallbackMessage=IDM_SHELL; 40Qzo%eL  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; mE^tzyh  
 data.uID=98; >!Ap/{2  
 Shell_NotifyIcon(NIM_ADD,&data); nKjeH@&#  
 ShowWindow(SW_HIDE); \gp,Txueb  
 bTray=TRUE; AO}i@YJth  
} _Hd1sx  
<a+eF}*2  
void CCaptureDlg::DeleteIcon() X}j'L&{F@  
{ 0?F@iB~1F  
 NOTIFYICONDATA data; @ojg`!,  
 data.cbSize=sizeof(NOTIFYICONDATA); a(ux?V)E.  
 data.hWnd=GetSafeHwnd(); %kZ~xbY  
 data.uID=98; l0caP(  
 Shell_NotifyIcon(NIM_DELETE,&data); sh !~T<yy  
 ShowWindow(SW_SHOW); W?^8/1U  
 SetForegroundWindow(); O~#uQm  
 ShowWindow(SW_SHOWNORMAL); >2lAy:B5  
 bTray=FALSE; ~w1{zxs  
} fs rg2:kQ  
+(<n |~  
void CCaptureDlg::OnChange() <RoX|zJw  
{ 20/P M9  
 RegisterHotkey(); i|c`M/) h:  
} ST: v3*  
K/wiL69  
BOOL CCaptureDlg::RegisterHotkey() X40la_[.  
{ hINnb7 o  
 UpdateData(); Q.9Ph ~  
 UCHAR mask=0; jTd4H)  
 UCHAR key=0; S< EB&P  
 if(m_bControl) T6R7,Vt'v  
  mask|=4; EtR@sJ<  
 if(m_bAlt) })zB".  
  mask|=2; Ufaqhh  
 if(m_bShift) 1o|0x\q  
  mask|=1; 6VH90KAT  
  key=Key_Table[m_Key.GetCurSel()]; f/0v' Jt  
 if(bRegistered){ Siz!/O!'  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); r*i$+ Z  
  bRegistered=FALSE; kMl@v`  
 } 6+Wr6'kuH  
 cMask=mask; .*EOVo9S  
 cKey=key; "[Qb'9/Jc  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); =j|v0& AGC  
 return bRegistered; 1H&?UP4=(  
} `z-H]fU  
P~Te+ -jX}  
  四、小结 *xX( !t'  
[+;FV!M6  
  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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