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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: hWuq  
  Qza[~6  
  一、实现方法 8B\,*JGY2  
3):7mE(  
  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: I8?egDkk  
6:QJ@j\  
#pragma data_seg("shareddata") GY0<\-  
HHOOK hHook =NULL; //钩子句柄 r?H {Y3 ,  
UINT nHookCount =0; //挂接的程序数目 4?8GK  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 A7ck-9dT/L  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 6 0QElJ9D  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey %#|S  
static int KeyCount =0; ~*G I<n  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 +)ro EJ_  
#pragma data_seg() Xa%Z0% {  
hydn" 9;  
  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。 -@AGQ+e  
F5)Ta?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: V8&%fxn+  
k98--kc5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR +]UPY5:F  
cKey,UCHAR cMask) A.y"R)G  
{ 7!Fu.Ps >  
 BOOL bAdded=FALSE; R-Uj\M>  
 for(int index=0;index<MAX_KEY;index++){ v]vrD2L  
  if(hCallWnd[index]==0){ .\< \J|3  
   hCallWnd[index]=hWnd; `/Z8mFs Y  
   HotKey[index]=cKey; {T.$xiR  
   HotKeyMask[index]=cMask; A:k`Ykr[  
   bAdded=TRUE; JQI`9$asuC  
   KeyCount++; %M~Ugv_4v  
   break; I]TL#ywF   
  }  vUJb-  
 } {:fyz#>>^  
 return bAdded; bQ_i&t\yzB  
} Fa@#nY|UV3  
//删除热键 -3ha LdRk6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b>;5#OQfn  
{ l--xq^,`o]  
 BOOL bRemoved=FALSE; SyTcp?H  
 for(int index=0;index<MAX_KEY;index++){ r+\it&cW+  
  if(hCallWnd[index]==hWnd){ R],,-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ C\E Z8  
    hCallWnd[index]=NULL; \:^$ZBQr<n  
    HotKey[index]=0; #O=^%C 7p  
    HotKeyMask[index]=0; 0p&:9|'z  
    bRemoved=TRUE; ])0&el3-  
    KeyCount--; @4hxGk=  
    break; *$uKg zv3  
   } ^8E/I]-  
  } 'X{7b <  
 } %p^C,B{7w  
 return bRemoved; trM8 p  
} u{exQ[,E  
hnH:G`[F  
hg=\L5R  
  DLL中的钩子函数如下: _d)w, ;m#  
O^|,Cbon6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) C+O`3wPZp  
{ pcm|  
 BOOL bProcessed=FALSE; !0E$9Xon  
 if(HC_ACTION==nCode) 4Uz6*IQNl  
 { (\#j3Y)r  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 0+M1,?+GfF  
   switch(wParam) EGU? 54  
   {  V?5QpBK I  
    case VK_MENU: gXs@FhR0  
     MaskBits&=~ALTBIT; &)<]AG.vd!  
     break; G;wv.|\  
    case VK_CONTROL: vg *+>lbA  
     MaskBits&=~CTRLBIT; et/mfzV  
     break; CSwNsFDR%  
    case VK_SHIFT: m6aoh^I  
     MaskBits&=~SHIFTBIT; -mcLT@  
     break; C[<&% =  
    default: //judge the key and send message :cIE8<\%  
     break; v" y e\ZG  
   } tWL9>7]G  
   for(int index=0;index<MAX_KEY;index++){ U#@:"v|  
    if(hCallWnd[index]==NULL) Q y$8!(  
     continue; > aN@)=h}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eGtIVY/D  
    { < _c84,[V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6'|J ;  
     bProcessed=TRUE; [,xFk* #  
    } B<LQ;n+  
   } .|x0du|  
  } b< Pjmb+  
  else if((lParam&0xc000ffff)==1){ //有键按下 sRt|G  
   switch(wParam) P4Wd=Xoz6  
   { (47jop0RDQ  
    case VK_MENU: jAN(r>zVL  
     MaskBits|=ALTBIT; 80l(,0`,  
     break; l.fNkLC#  
    case VK_CONTROL: l<GRM1^kU  
     MaskBits|=CTRLBIT; I\`:(V  
     break; B3)#Ou2  
    case VK_SHIFT: GsE?<3  
     MaskBits|=SHIFTBIT; |LiFX5!\  
     break; s^js}9]p  
    default: //judge the key and send message 9]7+fu  
     break; 7q$9\RR5  
   } Ay"x<JB{U2  
   for(int index=0;index<MAX_KEY;index++){ (Q#ArMMORI  
    if(hCallWnd[index]==NULL) vWjK[5 M%  
     continue; bbA+ZLZJn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _ 4Hf?m7z  
    { S3btx9y{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); LP#CA^*S  
     bProcessed=TRUE; 8I NVn'G  
    } "x3_cA~  
   } [Z~>7ayF+)  
  } Z*jhSy  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ely&'y!  
   for(int index=0;index<MAX_KEY;index++){ wp.'M?6`L  
    if(hCallWnd[index]==NULL) B=|yjA'Fg  
     continue; tAbIT;>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -D38>#Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /xj'Pq((}p  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 y)Ip\.KV\  
   } E5-8tHV   
  } r(%#@?&  
 } ax7u b  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :t^=~xO9  
} F2 >o"j2  
ls 'QfJm  
  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: C @hnT<e  
6Q>:g"_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); '00DUUa  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Lu1>A {et  
kZPj{^c:  
  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: 3_vggK%  
i&Xr+Zsec"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9bqfZ"6nXY  
{ h`&mW w  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ]V><gZ  
 { %6kD^K-  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 j%~UU0(J  
  SaveBmp(); 6;[iX`LL  
  return FALSE; q+|Dm<Ug  
 } [<8<+lH=P  
 …… //其它处理及默认处理 )wSsxX7:  
} >SSF:hI"J  
 QqtFNG  
Vk{0)W7  
  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。 Gd:fWz(  
;y4 "wBX  
  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。 _pjpPSV6J  
s:wLEj+  
  二、编程步骤 cg$7`/U  
#HM0s~^w&  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ]5rEwPB  
DV{Qbe#In  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; B7N?"'$i  
EDL<J1%  
  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; J cvK]x  
gLd3,$ Ei  
  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; J=zh+oLCV  
e?RHf_d3T-  
  5、 添加代码,编译运行程序。 a+r0@eFLc  
;h0?o*i_  
三、程序代码 PNg,bcl  
GS< ,adD  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL  =Lp0i9c  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ^J@Y?CQl\  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ [8O`VSV3  
#if _MSC_VER > 1000 b`18y cVME  
#pragma once HO & #Lv  
#endif // _MSC_VER > 1000 xxiEL2"`>  
#ifndef __AFXWIN_H__ 8~}Ti*Urc  
#error include 'stdafx.h' before including this file for PCH sE-"TNONZ  
#endif {.Nt#l  
#include "resource.h" // main symbols w9i1ag  
class CHookApp : public CWinApp t4F1[P  
{ B>|@XfPM  
 public: 7NoB   
  CHookApp(); 0dXZd2oK@  
  // Overrides xqM R[W\x  
  // ClassWizard generated virtual function overrides 'rq [P",  
  //{{AFX_VIRTUAL(CHookApp) oy/#,R_n%  
 public: a"#5JcR3  
  virtual BOOL InitInstance(); j.AAY?L  
  virtual int ExitInstance(); <7?MutHM-  
  //}}AFX_VIRTUAL H[!by)H  
  //{{AFX_MSG(CHookApp) m:X;dcq'3  
  // NOTE - the ClassWizard will add and remove member functions here. Eh8.S)E  
  // DO NOT EDIT what you see in these blocks of generated code ! j YO #  
  //}}AFX_MSG Ed_A#@V  
  DECLARE_MESSAGE_MAP() TpZ)v.w~l7  
}; Tx],- U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); u=RF6V|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =;^2#UxXA&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]7c715@  
BOOL InitHotkey(); IuB0C!'  
BOOL UnInit(); C!~&c7  
#endif q$>At} 4  
/d8PDc"  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. MP0gLi  
#include "stdafx.h" Yl>@(tu)|  
#include "hook.h" $+:_>n^#/  
#include <windowsx.h> FW=oP>f]w  
#ifdef _DEBUG AqE . TK  
#define new DEBUG_NEW /,GDG=ra  
#undef THIS_FILE sh E>gTe  
static char THIS_FILE[] = __FILE__; </qXKEu`_  
#endif T4J (8!7  
#define MAX_KEY 100 VY Va8[}  
#define CTRLBIT 0x04 zcP_-q]1  
#define ALTBIT 0x02 lE$X9yIt  
#define SHIFTBIT 0x01 sq-[<ryk  
#pragma data_seg("shareddata") Dgp"RUP  
HHOOK hHook =NULL; QTtcGU  
UINT nHookCount =0; ewY+a , t  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey U6n%rdXJ=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT vSPkm)O0)  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey /m.6NVu7  
static int KeyCount =0; co@Q   
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift <_ddGg~  
#pragma data_seg() @<AyCaU`.  
HINSTANCE hins; *,@dt+H!y  
void VerifyWindow(); ~Ci|G3BW  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) F|%[s|s  
//{{AFX_MSG_MAP(CHookApp) n\wO[l)  
// NOTE - the ClassWizard will add and remove mapping macros here. Z5_U D  
// DO NOT EDIT what you see in these blocks of generated code! PgxD?Oi8  
//}}AFX_MSG_MAP 5?%(j!p5  
END_MESSAGE_MAP() iI&J_Y{1a_  
j`='SzVloW  
CHookApp::CHookApp() WPCaxA+l  
{ ~.yt  
 // TODO: add construction code here, 4^  $  
 // Place all significant initialization in InitInstance l;F3kA  
} >/ W:*^g)  
0rjxWPc  
CHookApp theApp; 7 45Uo'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) JX`+b  
{ DY0G ;L 3  
 BOOL bProcessed=FALSE; zF3fpEKe  
 if(HC_ACTION==nCode) |jO&qT]{  
 { OUS@)Tyh  
  if((lParam&0xc0000000)==0xc0000000){// Key up zD7\Gv  
   switch(wParam) g}P.ksM  
   { ;r"YZs&Xd  
    case VK_MENU: ^szCf|SM  
     MaskBits&=~ALTBIT; :TX!lbCq  
     break; .)ZK42Qd  
    case VK_CONTROL: @/E5$mX`  
     MaskBits&=~CTRLBIT; YRAWylm  
     break; 8b[ ^6]rM  
    case VK_SHIFT: %Nzg~ZPbmT  
     MaskBits&=~SHIFTBIT; AEe*A+  
     break; 8;-a_VjA)  
    default: //judge the key and send message >N{K)a  
     break; j#Bea ,  
   } +8v^J8q0  
   for(int index=0;index<MAX_KEY;index++){ ^e8~eL+  
    if(hCallWnd[index]==NULL) ` SZ^~O  
     continue; : H0+}=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <p-R{}8  
    { E+]gC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `N]!-=o  
     bProcessed=TRUE; u-f_,],p  
    } al(t-3`<  
   } E[)`+:G]  
  } ~OAST  
  else if((lParam&0xc000ffff)==1){ //Key down tTX2>8Gmr  
   switch(wParam) :,]V 03  
   { aS-rRL|\L  
    case VK_MENU: A8dIL5  
     MaskBits|=ALTBIT; R'uM7,7  
     break; q6%jCt2'  
    case VK_CONTROL: `Q' 0l},  
     MaskBits|=CTRLBIT; 0 ua.aL'  
     break; zdlysr#  
    case VK_SHIFT: k8Qm +r<p  
     MaskBits|=SHIFTBIT; )apqL{u:=  
     break; -;Y*;xe  
    default: //judge the key and send message c7[|x%~  
     break; C;-9_;&  
   } ,mx>)} l95  
   for(int index=0;index<MAX_KEY;index++) )k.;.7dXe  
   { b$l@Z&[]  
    if(hCallWnd[index]==NULL) +DY% Y `0  
     continue; %D)W~q-g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ze~^+ EE  
    { soRt<83  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _%?}e|epy  
     bProcessed=TRUE; '+hiCX-_  
    } qfd/t<?|D  
   } Cb%?s  
  } Q"h/o"-h  
  if(!bProcessed){ 2,{m>fF  
   for(int index=0;index<MAX_KEY;index++){ ypSW9n  
    if(hCallWnd[index]==NULL) 1(CpTaa  
     continue; Jlj=FA`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %oJ_,m_(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); se:]F/  
   } /bjyV]N  
  } NldeD2~H  
 } e23}'qb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $-Lk,}s.*  
} zWb>y  
n ,!PyJ  
BOOL InitHotkey() @T0F }(k  
{ "t$c'`  
 if(hHook!=NULL){ AcqsXBKd  
  nHookCount++; O(2)A>}  
  return TRUE; -NHA{?6r  
 } swss#?.se  
 else s5F,*<  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); s2FJ^4  
  if(hHook!=NULL) z@R:~  
   nHookCount++; 8J-$+ ;  
  return (hHook!=NULL); fI9 TzpV  
} B[%FZm$`M  
BOOL UnInit() "CI#2tnL7  
{ %SaC[9=?  
 if(nHookCount>1){ oJE~dY$Q  
  nHookCount--; .bE+dA6:v  
  return TRUE; ~Gx"gK0  
 } fjVGps$ j  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 2R66 WK Q  
 if(unhooked==TRUE){ 2Z;wU]  
  nHookCount=0; _Q_"_*e  
  hHook=NULL; D[yOFJ~p)  
 } j qfxQ  
 return unhooked; .Zv@iL5  
} `dO)}}| y  
Xxhzzm-B  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 00X~/'!  
{ Wnm?a!j5  
 BOOL bAdded=FALSE; a NhI<.v  
 for(int index=0;index<MAX_KEY;index++){ 9#Gz2u$  
  if(hCallWnd[index]==0){ e"Kg/*Ji1  
   hCallWnd[index]=hWnd; `a2%U/U  
   HotKey[index]=cKey; SIQ7oxS4  
   HotKeyMask[index]=cMask; q$6fb)2I]e  
   bAdded=TRUE; "Qj;pqR  
   KeyCount++; r%QTUuRXC3  
   break; In<L?U?([D  
  } sH(@X<{p  
 } `"`/_al^  
 return bAdded; )!M %clm.  
} \ <b-I  
}i0(^"SoXZ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !A!}j.s  
{ f"My;K$l;  
 BOOL bRemoved=FALSE; I<yd=#:n  
 for(int index=0;index<MAX_KEY;index++){ `p0+j  
  if(hCallWnd[index]==hWnd){ ++=t|ZS U  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]Y@Db5S$T  
    hCallWnd[index]=NULL; Z3X/SQ'0  
    HotKey[index]=0; X!#rw= Q  
    HotKeyMask[index]=0; v0W w~4|],  
    bRemoved=TRUE; g$$i WC!S<  
    KeyCount--; M#ED49Dh>  
    break; D_mdX9-~  
   } =pSuyM'  
  } <\40?*2  
 } O1!hSu&  
 return bRemoved; 0$Rl78>(  
} $ <'i+kK  
WxO2  
void VerifyWindow() >#~!03  
{ 4B? 8$&b  
 for(int i=0;i<MAX_KEY;i++){ $3.hZx>  
  if(hCallWnd!=NULL){ c%,@O&o  
   if(!IsWindow(hCallWnd)){ a k&G=a6^  
    hCallWnd=NULL; vU= +  
    HotKey=0; O_-Lm4g?4  
    HotKeyMask=0; ixc~DV+@[  
    KeyCount--; G- nS0Kn:  
   } %A_h!3f&  
  } )lB 3U  
 } Ne>yFl"u  
} !Q(xA,p  
j8gw]V/B:  
BOOL CHookApp::InitInstance() +$_.${uwV  
{ }e[;~g\&  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); W\f u0^  
 hins=AfxGetInstanceHandle(); N1dv}!/*.+  
 InitHotkey(); B'sgCU  
 return CWinApp::InitInstance(); R)}ab{A  
} pgNyLgN  
$6 46"1S  
int CHookApp::ExitInstance() bp"@vlv  
{ pHO,][VZ  
 VerifyWindow(); pYXusS7S  
 UnInit(); ^&^~LKl~  
 return CWinApp::ExitInstance(); >|[ l?`  
} W:5,zFW  
l6kqP  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file )g;*u,C  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {DfXn1Cg0U  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ FZdZGK  
#if _MSC_VER > 1000 CG!7BP\  
#pragma once '8RBR%)y  
#endif // _MSC_VER > 1000 d#l z^Ls2  
6yU#;|6d  
class CCaptureDlg : public CDialog |t<Uh,Bt  
{ F`C$F!GE  
 // Construction -l)u`f^n|  
 public: Q:rQ;/b0/  
  BOOL bTray; _c:}i\8R  
  BOOL bRegistered; e$ pXnMx7  
  BOOL RegisterHotkey(); LHJ}I5zv  
  UCHAR cKey; i"4&UJu1;  
  UCHAR cMask; 6sE%]u<V  
  void DeleteIcon(); QV&yVH=Xs  
  void AddIcon(); e#{,M8  
  UINT nCount; ?7?hDw_Nk  
  void SaveBmp(); ! J7ExfEA  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 5}v<?<l9\  
  // Dialog Data TDqH"q0  
  //{{AFX_DATA(CCaptureDlg) )7`2FLG  
  enum { IDD = IDD_CAPTURE_DIALOG }; 3fdx&}v/  
  CComboBox m_Key; -(ev68'}W  
  BOOL m_bControl; YoU|)6Of   
  BOOL m_bAlt; @cc4]>4  
  BOOL m_bShift; DAvF ND$=  
  CString m_Path; ()cqax4  
  CString m_Number; ON()2@Y4  
  //}}AFX_DATA ;&K +x@  
  // ClassWizard generated virtual function overrides J/T$.*X  
  //{{AFX_VIRTUAL(CCaptureDlg) |:[ [w&R  
 public: IXA3G7$)  
  virtual BOOL PreTranslateMessage(MSG* pMsg); V$OZC;4  
 protected: cUB+fH<B2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >^odV ;^  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =uG}pgh0  
  //}}AFX_VIRTUAL lPBWpHX  
  // Implementation #.KVT#%~{  
 protected: %qI.Qw$  
  HICON m_hIcon; sfo+B$4|  
  // Generated message map functions TAE@KSPvo  
  //{{AFX_MSG(CCaptureDlg) }I )%Gw  
  virtual BOOL OnInitDialog(); |O!G[|/3  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); kuX{2h*`  
  afx_msg void OnPaint(); q2SlK8`QJ  
  afx_msg HCURSOR OnQueryDragIcon(); n^xB_DJ~  
  virtual void OnCancel(); wr`+xYuuC=  
  afx_msg void OnAbout(); kiP-^Wan  
  afx_msg void OnBrowse(); ,SVl>~!  
  afx_msg void OnChange(); q$ZmR]p  
 //}}AFX_MSG &N+i3l6`  
 DECLARE_MESSAGE_MAP() eI#b%h  
}; He1hgJ)N  
#endif VMZUJ2Yj/&  
<meQ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file p#QR^|7"  
#include "stdafx.h" #'qDNY@w}  
#include "Capture.h" 7]J7'!Iz  
#include "CaptureDlg.h" $URL7hrhU  
#include <windowsx.h> LA9'HC(5  
#pragma comment(lib,"hook.lib") $eSSW+8q"  
#ifdef _DEBUG To!` T$Xh  
#define new DEBUG_NEW g##yR/L  
#undef THIS_FILE lL<LJ :L  
static char THIS_FILE[] = __FILE__; kM JA#{<  
#endif GxynLXWo>  
#define IDM_SHELL WM_USER+1 V1]QuQ{&s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Sy0-tK4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X?B\+dq  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ]iq2_{q  
class CAboutDlg : public CDialog ag* 5fBF  
{ Y<WA-dYoF  
 public: >;NiG)Z  
  CAboutDlg(); f_m~_`m  
  // Dialog Data g^mnYg5  
  //{{AFX_DATA(CAboutDlg) SJai<>k h  
  enum { IDD = IDD_ABOUTBOX }; ~!iZn  
  //}}AFX_DATA Acl?w }Y  
  // ClassWizard generated virtual function overrides r:~q{  
  //{{AFX_VIRTUAL(CAboutDlg) +U^H`\EUr  
 protected: V/dL-;W;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support s9\N{ar#  
  //}}AFX_VIRTUAL Hgk@I;  
  // Implementation UNO KK_  
 protected: ;x|LB>.  
  //{{AFX_MSG(CAboutDlg)  &e%eIz  
  //}}AFX_MSG a<W.}0ZY  
  DECLARE_MESSAGE_MAP() #*~3gMI{=  
}; =3H*%  
$p)e.ZMgE  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) \; FE@  
{ hf1h*x^J  
 //{{AFX_DATA_INIT(CAboutDlg) mr[+\ 5  
 //}}AFX_DATA_INIT W2T-TI,>PC  
} $ vt6~nfI  
Sa 8T'%W  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) S0]JeP+3!  
{ |e+r|i]  
 CDialog::DoDataExchange(pDX); b.#0{*/G  
 //{{AFX_DATA_MAP(CAboutDlg) 2,^ U8/  
 //}}AFX_DATA_MAP i[O{ M`Z%  
} 14S_HwX  
{=Z _L?j  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) m2j]wUh"  
 //{{AFX_MSG_MAP(CAboutDlg) &0k`=?v$  
 // No message handlers d cG)ql4d  
 //}}AFX_MSG_MAP %h9'kJzNk  
END_MESSAGE_MAP() t^|GcU]  
.:(T}\]R  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) r=4vN=:  
: CDialog(CCaptureDlg::IDD, pParent) *!c&[- g  
{ ,w|Or}h]7  
 //{{AFX_DATA_INIT(CCaptureDlg) x4Wu`-4^  
  m_bControl = FALSE; wN2D{Jj  
  m_bAlt = FALSE; zS/1v+  
  m_bShift = FALSE; VC.zmCglo^  
  m_Path = _T("c:\\"); XbYST%| .  
  m_Number = _T("0 picture captured."); Q*W$!ZUT  
  nCount=0; mFx \[S  
  bRegistered=FALSE; R\Of ,  
  bTray=FALSE; r-'CB  
 //}}AFX_DATA_INIT Xwz'h;Ks_  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 /1z3Q_M  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); bqcwZ6r<  
} Fu\!'\6  
OeYZLC(  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Rz:1(^oA  
{ {osadXd C  
 CDialog::DoDataExchange(pDX); uMb[0-5  
 //{{AFX_DATA_MAP(CCaptureDlg) =EQaZ8k  
  DDX_Control(pDX, IDC_KEY, m_Key); rk7d7`V  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); GbfA-\  
  DDX_Check(pDX, IDC_ALT, m_bAlt); /`+ubFXc  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ]?*L"()kp  
  DDX_Text(pDX, IDC_PATH, m_Path); ?atHZLF  
  DDX_Text(pDX, IDC_NUMBER, m_Number); xO 6$:o-  
 //}}AFX_DATA_MAP i@o'Fc  
} <o"2z~gv  
YGsg0I't  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ^EZ?wdL  
//{{AFX_MSG_MAP(CCaptureDlg) mXJ`t5v^l  
 ON_WM_SYSCOMMAND() _`d=0l*8  
 ON_WM_PAINT() D`hg+64}  
 ON_WM_QUERYDRAGICON() PE&$2(  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) d8N4@3CkL  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) N@3&e;y  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Tr$37suF  
//}}AFX_MSG_MAP 3hPp1wZd   
END_MESSAGE_MAP() K0^Tg+U($p  
?!;i/h*{  
BOOL CCaptureDlg::OnInitDialog() /?B%,$~  
{ |gwGCa+  
 CDialog::OnInitDialog(); >)8<d3m  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); = 6.i.(L_S  
 ASSERT(IDM_ABOUTBOX < 0xF000); WJBwo%J  
 CMenu* pSysMenu = GetSystemMenu(FALSE); dCO7"/IHW  
 if (pSysMenu != NULL) >7(7  
 { ['DYP-1J  
  CString strAboutMenu; fIii  
  strAboutMenu.LoadString(IDS_ABOUTBOX); N/8_0]Gf  
  if (!strAboutMenu.IsEmpty()) txFcV  
  { aFd87'^  
   pSysMenu->AppendMenu(MF_SEPARATOR); Zd~Q@+sH  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); E, ;'n  
  } @M=\u-jJ.  
 } Mp_SL^g|  
 SetIcon(m_hIcon, TRUE); // Set big icon ^wW{7Uq>  
 SetIcon(m_hIcon, FALSE); // Set small icon  E-L>.tD  
 m_Key.SetCurSel(0); _qU;`Q  
 RegisterHotkey(); ~ea&1+Z[3  
 CMenu* pMenu=GetSystemMenu(FALSE); oA`G\Xh_E  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -5u. Ix3  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); PD`EtkUnv  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 'da$i  
 return TRUE; // return TRUE unless you set the focus to a control Ch7&9NW  
} ds:&{~7L<T  
.s`7n *xz  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 5O]eD84B  
{ |3dIq=~1"Y  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) k56*eEc  
 { i/aj;t  
  CAboutDlg dlgAbout; qLk7C0  
  dlgAbout.DoModal(); F ,h}HlU  
 } 2U rE>_  
 else XT{o ]S~nq  
 { 41 #YtZ  
  CDialog::OnSysCommand(nID, lParam); ?a{>QyL  
 } , %$Cfu  
} G&@vTcF  
P.'$L\  
void CCaptureDlg::OnPaint() naiy] oY"  
{ aB)G!Rm&  
 if (IsIconic()) z18<rj  
 { sV-UY!   
  CPaintDC dc(this); // device context for painting !WNO!S0/j  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |6T"T P  
  // Center icon in client rectangle A}MF>.!}C  
  int cxIcon = GetSystemMetrics(SM_CXICON); KDu~,P]  
  int cyIcon = GetSystemMetrics(SM_CYICON); *# ;  
  CRect rect; F:'>zB]-}  
  GetClientRect(&rect); R:Tv'I1-L  
  int x = (rect.Width() - cxIcon + 1) / 2; R0bWI`$Z  
  int y = (rect.Height() - cyIcon + 1) / 2; ^9`~-w  
  // Draw the icon }-%:!*bLj  
  dc.DrawIcon(x, y, m_hIcon); i?IV"*Ob1N  
 } mL3 Q  
 else 3Nk )  
 { ?7Skk  
  CDialog::OnPaint(); ]6;oS-4gu?  
 } ]Ag{#GJ5D  
} (tz fyZ M  
GpGq' 8|(  
HCURSOR CCaptureDlg::OnQueryDragIcon() 4]m?8j) 6b  
{ r)Fd3)e   
 return (HCURSOR) m_hIcon; A1/[3Bz  
} g7O , <  
.7r$jmuFs  
void CCaptureDlg::OnCancel() z.0!FUd  
{ ydf;g5OZ  
 if(bTray) cBDOA<]r,  
  DeleteIcon(); ?Y'r=Q{w  
  CDialog::OnCancel(); Na{&aqdz  
} K?H(jP2mpM  
1SY3  
void CCaptureDlg::OnAbout() DPylc9[-  
{ +Q&CIo  
 CAboutDlg dlg; R~d{Yv  
 dlg.DoModal(); a.B<W9$`  
} {z*`* O@  
8Lh[>|~=  
void CCaptureDlg::OnBrowse() -< }#ImTN  
{ jU_#-<'r  
 CString str; #}aBRKZ f6  
 BROWSEINFO bi; ^_XV}&7Q  
 char name[MAX_PATH]; QI{<q<  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); _[8sL^  
 bi.hwndOwner=GetSafeHwnd(); $[g8j`or!  
 bi.pszDisplayName=name; <:I]0|[  
 bi.lpszTitle="Select folder"; Fu"@)xw/-q  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ;1L7+.A  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); A S]jJc^  
 if(idl==NULL) D}L4uz?  
  return; \!!1o+#1j  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 0;:AT|U/d  
 str.ReleaseBuffer(); pb}4{]sI  
 m_Path=str; &1M#;rE;D#  
 if(str.GetAt(str.GetLength()-1)!='\\') k{ibD5B  
  m_Path+="\\"; q-4#)EnW  
 UpdateData(FALSE); :?z E@Ct  
} p5 )+R/  
)ioIn`g^-  
void CCaptureDlg::SaveBmp() fhbILg  
{ ;ksxz  
 CDC dc; 8I%N^G  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Xr$hQbl5D  
 CBitmap bm; d{~Qd|<rr  
 int Width=GetSystemMetrics(SM_CXSCREEN); *kKdL  
 int Height=GetSystemMetrics(SM_CYSCREEN); jWJ/gv~ $  
 bm.CreateCompatibleBitmap(&dc,Width,Height); u,),kj<  
 CDC tdc; k=JT%  
 tdc.CreateCompatibleDC(&dc); F>co#  
 CBitmap*pOld=tdc.SelectObject(&bm); (*dJ   
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *tL1t\jY  
 tdc.SelectObject(pOld); +<W8kb  
 BITMAP btm; ]_&pIBp  
 bm.GetBitmap(&btm); tqT-9sEXX.  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; bZi;jl  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); `)_11ywZ  
 BITMAPINFOHEADER bih; FN295:Iuw  
 bih.biBitCount=btm.bmBitsPixel; P<s:dH"  
 bih.biClrImportant=0; (h>+ivf|  
 bih.biClrUsed=0; -[-Ry6G  
 bih.biCompression=0; &$hT27A>k  
 bih.biHeight=btm.bmHeight; C 8q VYrw  
 bih.biPlanes=1; H\ONv=}7I  
 bih.biSize=sizeof(BITMAPINFOHEADER); 'w!8`LPu  
 bih.biSizeImage=size; fqS cf}s  
 bih.biWidth=btm.bmWidth; 2mVLR;s{_  
 bih.biXPelsPerMeter=0; "U%jG`q  
 bih.biYPelsPerMeter=0; 7T@"2WYat  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ~AG."<}  
 static int filecount=0; u@$pOLI  
 CString name; )0xEI  
 name.Format("pict%04d.bmp",filecount++); aIABx!83>  
 name=m_Path+name; NZ?|#5 3  
 BITMAPFILEHEADER bfh; .47tj`L   
 bfh.bfReserved1=bfh.bfReserved2=0; 4 Q FX  
 bfh.bfType=((WORD)('M'<< 8)|'B'); %QKRl 5RM-  
 bfh.bfSize=54+size; "f3KE=cUm  
 bfh.bfOffBits=54; ?ne!LDlE|  
 CFile bf; wO3K2I]>0  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /e4#D H  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); &4-rDR,  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 3+| {O  
  bf.WriteHuge(lpData,size); ]z_C7Y"4BR  
  bf.Close(); 1[r;  
  nCount++; {qkd63 X  
 } o= N_0.  
 GlobalFreePtr(lpData); ,Jh('r7  
 if(nCount==1) HRZ3}8Qj  
  m_Number.Format("%d picture captured.",nCount); I\peO/w  
 else {glRX R  
  m_Number.Format("%d pictures captured.",nCount); +i.b&PF'H  
  UpdateData(FALSE); (8/Qt\3jv  
} )XAD#GYM  
l#G }j^Q  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) (Jb[_d*  
{ b(McH*_8e  
 if(pMsg -> message == WM_KEYDOWN) |`yzH$,F  
 { s(Tgv  
  if(pMsg -> wParam == VK_ESCAPE) KV$J*B Y  
   return TRUE; 58 Rmq/6s  
  if(pMsg -> wParam == VK_RETURN) 8{Id+Q>Vo,  
   return TRUE; 1GL@t?S  
 } 4$<-3IP,  
 return CDialog::PreTranslateMessage(pMsg); $k&}{c8P  
} @43o4,  
ET7(n0*P}]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) MJ:>ZRXC E  
{ -j 6U{l  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ StuDtY  
  SaveBmp(); d.3O1TXK  
  return FALSE; +T@a/(Gl  
} fjAJys)Q  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~CB6+t>  
 CMenu pop; @#%rTKD9F  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); cn4C K. ?  
 CMenu*pMenu=pop.GetSubMenu(0); hp E?  
 pMenu->SetDefaultItem(ID_EXITICON); "A_W U|  
 CPoint pt; $LF  
 GetCursorPos(&pt); zaVDe9B,7  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); M7(vI4V  
 if(id==ID_EXITICON) ( |1 $zF+  
  DeleteIcon(); t;@VsQ8  
 else if(id==ID_EXIT) Hop$w  
  OnCancel(); t?0D*!D  
 return FALSE; wOy1i/oj  
} qK4E:dD  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); nuB@Fkr  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 4C ;4"6  
 AddIcon(); S4]xxc  
 return res; _= _]Yx  
} _|ucC$*  
jG0{>P#+  
void CCaptureDlg::AddIcon() K'%,dn  
{ W.ud<OKP90  
 NOTIFYICONDATA data; HB4Hz0Fa  
 data.cbSize=sizeof(NOTIFYICONDATA); h@72eav3+  
 CString tip; X?b]5?K;r  
 tip.LoadString(IDS_ICONTIP); ~4wbIE_r N  
 data.hIcon=GetIcon(0); cK>5!2b  
 data.hWnd=GetSafeHwnd(); KLXv?4!  
 strcpy(data.szTip,tip); ?J+[|*'yK  
 data.uCallbackMessage=IDM_SHELL; !b*lL#s,Y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; X9nt;A2TU+  
 data.uID=98; WIo^=?%  
 Shell_NotifyIcon(NIM_ADD,&data); Ou; ]>FJ  
 ShowWindow(SW_HIDE); e:V(kzAY;  
 bTray=TRUE; &j/ WjZPF  
} 'jeGERMr'  
0gVylQ  
void CCaptureDlg::DeleteIcon() A==P?,RG  
{ g?M\Z";  
 NOTIFYICONDATA data; WZRrqrjq  
 data.cbSize=sizeof(NOTIFYICONDATA); A0M)*9 f  
 data.hWnd=GetSafeHwnd(); ,:-S<]fS{_  
 data.uID=98; V5K!u8T  
 Shell_NotifyIcon(NIM_DELETE,&data); {so"xoA^c  
 ShowWindow(SW_SHOW); _{,e-_hYM  
 SetForegroundWindow(); 6Pl$DSu  
 ShowWindow(SW_SHOWNORMAL); QQ97BP7W  
 bTray=FALSE; tCK%vd%  
} -<}_K,Ky`  
A75IG4]  
void CCaptureDlg::OnChange() #:{PAt  
{ /wI$}X5o~  
 RegisterHotkey(); m$A|Sx&sG$  
} Rs8`M8(4%  
^o|igyS9  
BOOL CCaptureDlg::RegisterHotkey() R3&W.?C T  
{ R{@WlkG}  
 UpdateData(); ^Ebaq`{V\'  
 UCHAR mask=0; .BlGV2@^#  
 UCHAR key=0; `#2}[D   
 if(m_bControl) 2#ha Icm"  
  mask|=4; rayC1#f  
 if(m_bAlt) ?bQ~ +M\  
  mask|=2; Az6f I*yP  
 if(m_bShift) _7]* 5Pxo  
  mask|=1; j* g5f  
  key=Key_Table[m_Key.GetCurSel()]; WU{G_Fqaz  
 if(bRegistered){ sBq @W4  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Oh~J yrZy  
  bRegistered=FALSE; bKmR &  
 } v%= G~kF}[  
 cMask=mask; .!,T> :R  
 cKey=key; e0+N1kY  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (<(8(} x  
 return bRegistered; 2>.B*P  
} r.[!n)*  
zhKb|SV  
  四、小结 [st4FaQ36  
(m=-oQ&Ro  
  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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