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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: /7"V~c6  
  d6*84'|!  
  一、实现方法 U - OD  
-V;Y4,: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: ox`Zs2-a  
ppn  8  
#pragma data_seg("shareddata") eY#^vB  
HHOOK hHook =NULL; //钩子句柄 ``< #F3  
UINT nHookCount =0; //挂接的程序数目 gmH`XKi\  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 |Q)mBvvN  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 *#>(P  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey pLe4dz WA  
static int KeyCount =0; A z@@0  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 :|kO}NGM  
#pragma data_seg() ;b 65s9n^b  
*w0|`[P+h  
  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。 dakHH@Q  
;UgwV/d  
  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;65'"Q  
9;%$  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Q e+;BE-H  
cKey,UCHAR cMask) M2ex 3m  
{ f_O|  
 BOOL bAdded=FALSE; 8D`+3  
 for(int index=0;index<MAX_KEY;index++){ Xj+_"0 #  
  if(hCallWnd[index]==0){ I2HV{1(i  
   hCallWnd[index]=hWnd; |~%RSS~b*  
   HotKey[index]=cKey; E8Kk )7  
   HotKeyMask[index]=cMask; y "+'4:_  
   bAdded=TRUE; cO{NiRIb  
   KeyCount++; FVl, ttW  
   break; %[KnpJ{\  
  } f=V`Nn<=A  
 } p}sM"}Ul  
 return bAdded; VRY(@# q  
} \y?*} L  
//删除热键 Q8Ek}O\MC  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5@1h^w v  
{ *JX$5bZsI  
 BOOL bRemoved=FALSE; MOB4t|  
 for(int index=0;index<MAX_KEY;index++){ ]\K?%z  
  if(hCallWnd[index]==hWnd){ l=9D!6 4  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ tH;9"z# ~  
    hCallWnd[index]=NULL; %8I^&~E1  
    HotKey[index]=0; G"&$7!6[Y  
    HotKeyMask[index]=0; H +I,c1sF  
    bRemoved=TRUE; -w2^26 ax  
    KeyCount--; {J1rjrPo  
    break; TJRp/BP  
   } M:OZWYQ  
  } <-N eusx%  
 } xib}E[-l#  
 return bRemoved; JdI*@b2k[  
} yn ofDGAf  
=%I[o=6  
 U%r{{Q1  
  DLL中的钩子函数如下: 2X' H^t]7  
)M Iw/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) HLz<C  
{ ha|2u(4  
 BOOL bProcessed=FALSE; X~m57 b j  
 if(HC_ACTION==nCode) :CM-I_6  
 { p&Nav,9x  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 +&"W:Le:  
   switch(wParam) &u|t{C#0  
   {  = .S2gO >  
    case VK_MENU: 2u_=i$xW  
     MaskBits&=~ALTBIT; 4N= , 9  
     break; wT+60X'  
    case VK_CONTROL: YhglL!p C  
     MaskBits&=~CTRLBIT; l2W+VBn6  
     break; }` `oojz  
    case VK_SHIFT: PT,*KYF_O"  
     MaskBits&=~SHIFTBIT; zx "EAF{  
     break; Bi fI.2|  
    default: //judge the key and send message D_<B^3w )  
     break; JfJ ln[  
   } +1qvT_  
   for(int index=0;index<MAX_KEY;index++){ 'p[6K'Uq5  
    if(hCallWnd[index]==NULL) l]DRJ  
     continue; oIOeX1$V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B> i^w1  
    { N%:uOX8{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7.NL>:lu  
     bProcessed=TRUE; JYjc^m  
    } 1*9Yy~w  
   } (AA@ sN  
  } xF) .S@  
  else if((lParam&0xc000ffff)==1){ //有键按下 *]q`:~u2  
   switch(wParam) </<z7V,{  
   { N0lFx?4  
    case VK_MENU: tZ=|1lM  
     MaskBits|=ALTBIT; ^{yb4yQ 0  
     break; P/~dY  
    case VK_CONTROL: 5r8 [ "  
     MaskBits|=CTRLBIT; Yy[=E\z  
     break; ^+~$eg&js  
    case VK_SHIFT: uq:'`o-1  
     MaskBits|=SHIFTBIT; uJ=&++[  
     break; 8_>:0(y  
    default: //judge the key and send message u (r T2  
     break; WR.7%U';  
   } Zq1> M'V;  
   for(int index=0;index<MAX_KEY;index++){ UBM8l  
    if(hCallWnd[index]==NULL) ,9=P=JH  
     continue; =fBr2%qK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,t1s#*j\!q  
    { +A,cdi9z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); z&GGa`T"  
     bProcessed=TRUE; %E, -dw  
    } 79Q,XRWh|  
   } 3s:)CXO  
  } k]& I(VQ"  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Obc,    
   for(int index=0;index<MAX_KEY;index++){ .*FlB>1jy  
    if(hCallWnd[index]==NULL) /%?bO-  
     continue; >)+U^V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z SsogAx  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *qMjoP,  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 k3OnvnJb  
   } &n6 |L8  
  } Z+J~moW `  
 } N9)ERW2`*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }?{. 'Hv0  
} \<%FZT_4~  
&@7|_60  
  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: K1<l/ s  
OZ Obx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); < R@&<E6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2(D&jL  
|@-y+vbA*  
  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: A^c5CJ_  
; zy;M5l5.  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _x#r,1V+D  
{ i3Nt?FSN  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) +xmZK<{<  
 { Git2Cet  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 gAi}"} ;  
  SaveBmp(); r:^`005  
  return FALSE; DUm/0q&  
 } QQ,w:OjA0  
 …… //其它处理及默认处理 A@k=Mk  
} )^^}!U#|e  
~>$(5 s2  
10/3-)+  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 !q PUQ+  
Y50$ 2%kM  
  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。 ~0.@1zEXj  
YX2j;Y?  
  二、编程步骤 >y q L  
oWOH#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"; z#&qWO  
inGH'nl_  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ~u-`L+G"6  
s3T 6"%S`  
  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; \@n/L{}(@  
|@)ij c4i  
  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; ':]w  
w@f_TG"Vt  
  5、 添加代码,编译运行程序。 zjJyc?  
}W%}_UT  
三、程序代码 U(qM( E  
z<P#dj x  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL UuA=qWC  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) f.r-,%^6{  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 8%U)EU  
#if _MSC_VER > 1000 t,P +~ A  
#pragma once WqU$cQD"  
#endif // _MSC_VER > 1000 #$fFp  
#ifndef __AFXWIN_H__ *m]%eU(  
#error include 'stdafx.h' before including this file for PCH |b7>kM}"  
#endif {k~$\J?.  
#include "resource.h" // main symbols 17qrBG-/MD  
class CHookApp : public CWinApp ]R]X#jm  
{ ')FNudsC  
 public: `^N;%[c`z  
  CHookApp(); .g&BA15<F6  
  // Overrides E3KPJ`=!*"  
  // ClassWizard generated virtual function overrides _H3cqD  
  //{{AFX_VIRTUAL(CHookApp) N4 mQN90t  
 public: aH$*Ue@Q  
  virtual BOOL InitInstance(); A><%"9pZ  
  virtual int ExitInstance(); +Q_Gm3^  
  //}}AFX_VIRTUAL AAl`bhx'n  
  //{{AFX_MSG(CHookApp) "ChBcxvxb:  
  // NOTE - the ClassWizard will add and remove member functions here. z?YGE iR/}  
  // DO NOT EDIT what you see in these blocks of generated code ! i|d41u;@  
  //}}AFX_MSG B'0Il"g'  
  DECLARE_MESSAGE_MAP() -s!PO;qm  
}; $fvUb_n  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); cE]kI,Fw,M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); YGn:_9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6ensNr~ea  
BOOL InitHotkey(); `")  I[h  
BOOL UnInit(); <*5D0q#~"  
#endif 3 \WdA$Wx  
kI;^V  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. WK^qYfq|  
#include "stdafx.h" 1!NaOfP;@  
#include "hook.h" ^e 6(#SqR  
#include <windowsx.h> 6qA{l_V  
#ifdef _DEBUG p_(hM&>C  
#define new DEBUG_NEW  G0&w#j  
#undef THIS_FILE mLYB6   
static char THIS_FILE[] = __FILE__; '}Y8a$(;V  
#endif 4* hmeS"  
#define MAX_KEY 100 _1 JvA-  
#define CTRLBIT 0x04 -T(V6&'Qi  
#define ALTBIT 0x02 UX9o  
#define SHIFTBIT 0x01 ";. 3+z  
#pragma data_seg("shareddata") CUd'*Ewu  
HHOOK hHook =NULL; V7v,)a" L  
UINT nHookCount =0; bcE DjLXq  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ~5#7i_%@E}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT gddGl=rm  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Y{'G2)e  
static int KeyCount =0; Stw6%T-  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Te13Af~  
#pragma data_seg() gy[uq m_ T  
HINSTANCE hins; \ a<Ye T  
void VerifyWindow(); ?k?Hp:8?=  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) s`2o\]  
//{{AFX_MSG_MAP(CHookApp) 87/{\h  
// NOTE - the ClassWizard will add and remove mapping macros here. ZqGq%8\.s  
// DO NOT EDIT what you see in these blocks of generated code! S9BJjo  
//}}AFX_MSG_MAP vNt2s)J$  
END_MESSAGE_MAP() =@f;s<v/  
0&-sz=L  
CHookApp::CHookApp() 8YJ({ Ou_  
{ Y#5S;?bR  
 // TODO: add construction code here, zBR]bk\  
 // Place all significant initialization in InitInstance +$'/!vN  
} BW;u? 1Xa  
(^4%Fk&I-  
CHookApp theApp; 7> QtO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 32Z4&~ I  
{ ~!OjdE!u  
 BOOL bProcessed=FALSE; U#P#YpD;==  
 if(HC_ACTION==nCode) y%y#Pb |  
 { ij),DbWd  
  if((lParam&0xc0000000)==0xc0000000){// Key up G#*;3X$  
   switch(wParam) ro{MD s  
   {  x1et,&,  
    case VK_MENU: >j?uI6Uw  
     MaskBits&=~ALTBIT; G# C)]4[n  
     break; hU{%x#8}lK  
    case VK_CONTROL: U|QDV16f  
     MaskBits&=~CTRLBIT; |g{AD`  
     break; 57}q'84  
    case VK_SHIFT: :[&X*bw[  
     MaskBits&=~SHIFTBIT; /_|1,x-Kx  
     break; ?~{xL"  
    default: //judge the key and send message \NqC i'&  
     break; (65p/$Vh  
   } {m?x},  
   for(int index=0;index<MAX_KEY;index++){ $} Myj'`r  
    if(hCallWnd[index]==NULL) |+bG~~~%j  
     continue; 3PGyqt(   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (!(bysi9  
    { F*=RP$sj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); B+LNDnjO]  
     bProcessed=TRUE; 1d"P) 3dQ  
    } Z0=OR^HjA  
   } 9lxT5Wg  
  } |<0@RCgM  
  else if((lParam&0xc000ffff)==1){ //Key down #rwR)9iC0  
   switch(wParam) SJ-Sac58r  
   { ]lY9[~ v  
    case VK_MENU: loJ0PY'}=  
     MaskBits|=ALTBIT; `dZ|}4[1  
     break; %r"GL  
    case VK_CONTROL: 9vu8koL  
     MaskBits|=CTRLBIT; '3Ie0QO]"%  
     break; s$_#T  
    case VK_SHIFT: A.b#r[  
     MaskBits|=SHIFTBIT; ^xwFjQXx  
     break; (Wqhuw!u  
    default: //judge the key and send message 7w*&Yg]  
     break; h(-&.Sm")H  
   } A@OV!DJe]  
   for(int index=0;index<MAX_KEY;index++) 1c!},O  
   { ap~Iz  
    if(hCallWnd[index]==NULL) xTMTkVa+B  
     continue; [)A#9L~s=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *&]l  
    { 2LU'C,o?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); P>-,6a>  
     bProcessed=TRUE; $EIkk= z  
    } D,/9rH  
   } Ah6x2(:  
  } A2d2V**Z  
  if(!bProcessed){ ]Yex#K   
   for(int index=0;index<MAX_KEY;index++){ ihrrmlN?  
    if(hCallWnd[index]==NULL) D.b<I79bX  
     continue; 0 y%R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }[`?#`sW  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :N}KScS|Wa  
   } eZi<C}z  
  } (&,R1dLo  
 } .)w0C%]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )[*O^bPowI  
} \irjIXtV  
|5Pbc&mH8A  
BOOL InitHotkey() kVv <tw  
{ }q W aE  
 if(hHook!=NULL){ k;5}@3iQ  
  nHookCount++; h6i{5\7.  
  return TRUE; Gu).*cU  
 } wlM ?gQXU[  
 else w ZAXfNA  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ~0|hobk  
  if(hHook!=NULL) {6sfa?1j  
   nHookCount++; Fr3t [:D  
  return (hHook!=NULL); ".?{Y(~  
} (K6S tNtN  
BOOL UnInit() qGCg3u6  
{ [udV }  
 if(nHookCount>1){ CaBS0' n  
  nHookCount--; %LHV0u  
  return TRUE; rbbuSI  
 } V?BVk8D};  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Pltju4.:C  
 if(unhooked==TRUE){ K3DJ"NJ<Ji  
  nHookCount=0; -d'|X`^nE  
  hHook=NULL; GN c|)$  
 } P*Sip?tdE  
 return unhooked; z_@zMLs  
} FaE orQ  
o q)"1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V&v~kzLr+  
{ T(^8ki  
 BOOL bAdded=FALSE; gq3OCA!cX  
 for(int index=0;index<MAX_KEY;index++){  22~X~=  
  if(hCallWnd[index]==0){  a|uZJ*  
   hCallWnd[index]=hWnd;  LB7I`W  
   HotKey[index]=cKey; r$Y!Y#hwQ  
   HotKeyMask[index]=cMask; Ky$G$H  
   bAdded=TRUE; W%K8HAP"  
   KeyCount++; 6 JYOe  
   break; Gw^=kzh  
  } zq r%7U  
 } D ;$+]2  
 return bAdded; Zb;$ZUWQX  
} O/oYaAlFF@  
Lu.tRZ`$38  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) '<S:|$ $  
{ >[4|6k|\x  
 BOOL bRemoved=FALSE; .WyX/E$I^!  
 for(int index=0;index<MAX_KEY;index++){ = [os<+  
  if(hCallWnd[index]==hWnd){ .oN Sg.jG  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ bCUh^#]x  
    hCallWnd[index]=NULL; os^SD&hL  
    HotKey[index]=0; M|e n>P  
    HotKeyMask[index]=0; 9= $,]M  
    bRemoved=TRUE; =3dbw8I  
    KeyCount--; <|Eby!KXR  
    break; |S`yXsg  
   } 'xoE [0!  
  } @k6}4O?{  
 } sNmC#,  
 return bRemoved; l(\8c><m  
} ]f-'A>MC  
00a<(sS;  
void VerifyWindow() #'J7Wy  
{ L$c%u  
 for(int i=0;i<MAX_KEY;i++){ 9~%]|_(  
  if(hCallWnd!=NULL){ )"jn{%/t  
   if(!IsWindow(hCallWnd)){ ]{+M>i[  
    hCallWnd=NULL; ikG9l&n  
    HotKey=0; 4eL54).1O  
    HotKeyMask=0; 1"B9Z6jf  
    KeyCount--; @ZR4%A"X4  
   } UH&1c8y}  
  } rRrW   
 } mW0&uSM D  
} G:C6`uiy`  
He-Ja  
BOOL CHookApp::InitInstance() )X!DCL:16  
{ | 4oM+n;Y  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); AnE_<sPA  
 hins=AfxGetInstanceHandle(); NF(IF.8G  
 InitHotkey(); XAxI?y[c  
 return CWinApp::InitInstance(); `m;"I  
} Q[Sd  
s5aOAyb*w  
int CHookApp::ExitInstance() $0 S#d@v}  
{ 4\SBf\ c  
 VerifyWindow(); ) wo2GF  
 UnInit();  [Ro0eH  
 return CWinApp::ExitInstance(); /Q>{YsRRB  
} FoD/Q  
})Mv9~&S  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file cc(r,ij~4  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) sa(M66KkU  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ -WBz]GW4r  
#if _MSC_VER > 1000 o7a6 )2JK  
#pragma once mc=! X  
#endif // _MSC_VER > 1000 .Jat^iFj0  
Q()RO*9  
class CCaptureDlg : public CDialog -1r & s  
{ ji)4WG/1  
 // Construction 2DC cGKa"  
 public: H0b6ZA%n  
  BOOL bTray; ivUsMhx>S,  
  BOOL bRegistered; !0csNg!  
  BOOL RegisterHotkey(); R{xyme@"^  
  UCHAR cKey; $aPHl  
  UCHAR cMask; [g h[F  
  void DeleteIcon(); LXu"rfp  
  void AddIcon(); %v+fN?%x,d  
  UINT nCount; ]1|Ql*6y,  
  void SaveBmp(); nL(%&z \4  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor +b,31  
  // Dialog Data xAd>",=~  
  //{{AFX_DATA(CCaptureDlg) s3_e7D ^H  
  enum { IDD = IDD_CAPTURE_DIALOG }; PVS<QN%  
  CComboBox m_Key; ) 4L%zl7  
  BOOL m_bControl; V3A>Ag+^~  
  BOOL m_bAlt; /$Tl#   
  BOOL m_bShift; Sd<@X@iU8D  
  CString m_Path; :CkR4J!m3  
  CString m_Number; o=RqegL  
  //}}AFX_DATA _`X#c-J  
  // ClassWizard generated virtual function overrides 2hwXWTSu  
  //{{AFX_VIRTUAL(CCaptureDlg) jPYe_y  
 public: O *J_+6  
  virtual BOOL PreTranslateMessage(MSG* pMsg); |h=+&*(:  
 protected: hr!f: D  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support l@Eq|y,  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); o&XMgY~  
  //}}AFX_VIRTUAL OBw`!G*w  
  // Implementation _[{:!?-?  
 protected: ,7fc41O3V  
  HICON m_hIcon; '=K of1  
  // Generated message map functions (&P0la 1  
  //{{AFX_MSG(CCaptureDlg) gR-Qj  
  virtual BOOL OnInitDialog(); [#>$k 6F*  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ZP6 3Alt  
  afx_msg void OnPaint(); o ,Tr^e$  
  afx_msg HCURSOR OnQueryDragIcon(); _+Jf.n20  
  virtual void OnCancel(); |1QbO`f/F  
  afx_msg void OnAbout(); BheEI;}  
  afx_msg void OnBrowse(); R0hc tT1j  
  afx_msg void OnChange(); 4`UL1)A]  
 //}}AFX_MSG }@:QYTBi }  
 DECLARE_MESSAGE_MAP() O{B e )E~  
}; csdOIF  
#endif u $% D9Z^  
3?*M{Y|  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file s*)41\V0  
#include "stdafx.h" xf^<ec  
#include "Capture.h" )p!*c,  
#include "CaptureDlg.h" aZawBU.:  
#include <windowsx.h> s7.p$r  
#pragma comment(lib,"hook.lib") {n'qKur xY  
#ifdef _DEBUG EOBs}M;  
#define new DEBUG_NEW jI{~s]Q  
#undef THIS_FILE /[20e1 w!  
static char THIS_FILE[] = __FILE__; &G pA1  
#endif jr[<i\!  
#define IDM_SHELL WM_USER+1 |,1bkJt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); da00p-U  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1~R$$P11[9  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; R*Xu( 89  
class CAboutDlg : public CDialog sMz^!RX@  
{ ?}=-eJ(7e  
 public: U50s!Z t45  
  CAboutDlg(); $/, BJ/9  
  // Dialog Data Y[ iDX#  
  //{{AFX_DATA(CAboutDlg) )H;pGM:  
  enum { IDD = IDD_ABOUTBOX }; YH'$_,8peM  
  //}}AFX_DATA OBI+<2`Oc  
  // ClassWizard generated virtual function overrides 0~Iu7mPY  
  //{{AFX_VIRTUAL(CAboutDlg) +-H}s`  
 protected: Gq0]m  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @@%i( >4Z  
  //}}AFX_VIRTUAL jNe(w<',P  
  // Implementation wUK7um  
 protected: %qS]NC  
  //{{AFX_MSG(CAboutDlg) bSrRsgKvT  
  //}}AFX_MSG B=Zl&1  
  DECLARE_MESSAGE_MAP() lJ:M^.Em0  
}; jF38kj3O7  
3C rQBIj1  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) d1~_?V'r]  
{ "w*+v  
 //{{AFX_DATA_INIT(CAboutDlg) <2)s<S.;  
 //}}AFX_DATA_INIT yHWi [7$  
} *%T)\\H2  
I #M%%5e  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 2gd<8a''  
{ 861i3OXVE>  
 CDialog::DoDataExchange(pDX); o%Be0~n'  
 //{{AFX_DATA_MAP(CAboutDlg) AezvBY0'`z  
 //}}AFX_DATA_MAP ~|CJsD/  
} F-BJe]  
N+CXOI=6x  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &jV9*  
 //{{AFX_MSG_MAP(CAboutDlg) ?~"`^|d  
 // No message handlers ^w:OS5%R  
 //}}AFX_MSG_MAP 0W T#6D  
END_MESSAGE_MAP() *M> iZO*@  
JcTp(fnW.~  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) .7 (DxN  
: CDialog(CCaptureDlg::IDD, pParent) V&Xi> X8  
{ y4xT:G/M  
 //{{AFX_DATA_INIT(CCaptureDlg) E /fw?7eQ  
  m_bControl = FALSE; DR k]{^C~  
  m_bAlt = FALSE; -A/ds1=;  
  m_bShift = FALSE; K<@[_W+  
  m_Path = _T("c:\\"); zVM4BT(  
  m_Number = _T("0 picture captured."); La"o)L +m_  
  nCount=0; g d337jw  
  bRegistered=FALSE; Sao>P[#x  
  bTray=FALSE; *:=];1 O  
 //}}AFX_DATA_INIT [_y9"MMwn  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32  }Vvsh3  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); "sF Xl  
} LXHwX*`Y  
7"ylN"syZ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ,M\j%3  
{ J0^{,eY<  
 CDialog::DoDataExchange(pDX); cPpu  
 //{{AFX_DATA_MAP(CCaptureDlg) 5cD XWF  
  DDX_Control(pDX, IDC_KEY, m_Key); h [nH<m  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); n?'d|h  
  DDX_Check(pDX, IDC_ALT, m_bAlt); n,t6v5>88  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); <,jAk4  
  DDX_Text(pDX, IDC_PATH, m_Path); <Ctyht0c.  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ,f} h}  
 //}}AFX_DATA_MAP H4M{_2DO  
} `1nRcY  
9<xTu>7J  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) BG'6;64kx6  
//{{AFX_MSG_MAP(CCaptureDlg) 8AT;8I<K  
 ON_WM_SYSCOMMAND() 2HcsQ*H] G  
 ON_WM_PAINT() cyW;,uT)D  
 ON_WM_QUERYDRAGICON() m)s xotgXf  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) c{1V.  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) PC*m% ?+  
 ON_BN_CLICKED(ID_CHANGE, OnChange) `5~7IPl3  
//}}AFX_MSG_MAP YecT 96%  
END_MESSAGE_MAP() hP?7zz$*j  
7^ 4jcfJH  
BOOL CCaptureDlg::OnInitDialog() g[/^cJHQ  
{ O$a#2p&  
 CDialog::OnInitDialog(); }l~]b3@qu  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ; ;<J x.  
 ASSERT(IDM_ABOUTBOX < 0xF000); l`SK*Bm~<  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ./$ <J6-J  
 if (pSysMenu != NULL) q1H=/[a  
 { 53B.2 4Tm  
  CString strAboutMenu; S[v Rw]*  
  strAboutMenu.LoadString(IDS_ABOUTBOX); M]c7D`%s  
  if (!strAboutMenu.IsEmpty()) i-`,/e~XT  
  { )))2f skZ  
   pSysMenu->AppendMenu(MF_SEPARATOR); +H7y/#e+3  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /:U1!9.y  
  }  AlO,o[0  
 } YU&4yk lE  
 SetIcon(m_hIcon, TRUE); // Set big icon Ig<}dM.Z[  
 SetIcon(m_hIcon, FALSE); // Set small icon '<TD6jBs  
 m_Key.SetCurSel(0); Q~phGD3!~  
 RegisterHotkey(); ] bIt@GB  
 CMenu* pMenu=GetSystemMenu(FALSE); brntE:  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ~%`EeJwT  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); gWkjUz )  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); |V lMma z  
 return TRUE; // return TRUE unless you set the focus to a control 8=:A/47=J  
} AWO0NWTB  
PC|'yAN:  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) h-7A9:  
{ 't7Z] G  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) qk&gA}qF  
 { sH%&+4!3  
  CAboutDlg dlgAbout; ]3}feU+  
  dlgAbout.DoModal(); #zxd;;p3  
 } rsWQHHkO  
 else ) ]73S@P(=  
 { TZ'aNcGg  
  CDialog::OnSysCommand(nID, lParam); ^]VcxKUJ  
 } m$?.Yig?  
} B~?c3:6  
*|oPxQCtK  
void CCaptureDlg::OnPaint() {gsW(T>)  
{ 3!aEClRtq  
 if (IsIconic()) ?9p$XG  
 { =c&62;O  
  CPaintDC dc(this); // device context for painting 3)Zu[c[%'J  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Vb2\/e:k  
  // Center icon in client rectangle ZW>o5x__b  
  int cxIcon = GetSystemMetrics(SM_CXICON); 4Q;<Q"  
  int cyIcon = GetSystemMetrics(SM_CYICON); Lx%:t YZ  
  CRect rect; \7yJ\I  
  GetClientRect(&rect); #pX8{Tf[  
  int x = (rect.Width() - cxIcon + 1) / 2; v;Es^ YI  
  int y = (rect.Height() - cyIcon + 1) / 2; 2 l(Dee Y  
  // Draw the icon Xtkw Z3  
  dc.DrawIcon(x, y, m_hIcon); 8)pB_en3sO  
 } L?HF'5o  
 else ~ 7}]  
 { ilv_D~|  
  CDialog::OnPaint(); >Fyu@u  
 } zrrz<dW  
} :9`qogF>  
MI\]IQU  
HCURSOR CCaptureDlg::OnQueryDragIcon() Ir/:d]N*  
{ \#++s&06  
 return (HCURSOR) m_hIcon; 3w6&&R9  
} X'@'/[?  
RJx{eck%  
void CCaptureDlg::OnCancel() 3T1P$E" m  
{ +C_*Vs@4  
 if(bTray) 2SciB*5  
  DeleteIcon(); KY g3U  
  CDialog::OnCancel(); ~T02._E  
} ENq"mwV|  
=:gjz4}_8  
void CCaptureDlg::OnAbout() Ir27ZP  
{ @0|nq9l1  
 CAboutDlg dlg; Rboof`pVt  
 dlg.DoModal(); D-pX<0 -y  
} >! oF0R_<  
Fj^AW v^/  
void CCaptureDlg::OnBrowse() n' ?4.tb  
{ "U{,U`@?  
 CString str; r1G8]agO  
 BROWSEINFO bi; Y 9i][  
 char name[MAX_PATH]; < eQ[kM  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 5mavcle{4r  
 bi.hwndOwner=GetSafeHwnd(); sL i*SR  
 bi.pszDisplayName=name; 3u_oRs  
 bi.lpszTitle="Select folder"; b@ 6:1x  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Fc'[+L--Q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); \5hw9T&[B  
 if(idl==NULL) .E$q&7@/j  
  return; 2h )8Fq_"  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); BSKEh"f  
 str.ReleaseBuffer(); skR,-:"8  
 m_Path=str; RM,'o[%  
 if(str.GetAt(str.GetLength()-1)!='\\') +_~,86  
  m_Path+="\\"; OR;&TbWF(R  
 UpdateData(FALSE); _R74/|  
} p+[} Hxx=  
>A($8=+#x  
void CCaptureDlg::SaveBmp() U Du~2%  
{ HN68!v}C|  
 CDC dc; cy3M^_5B<  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); fK_~lGY(  
 CBitmap bm;  hgO?+x  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6m+W#]^  
 int Height=GetSystemMetrics(SM_CYSCREEN); [))JX"a  
 bm.CreateCompatibleBitmap(&dc,Width,Height); _2OuskL  
 CDC tdc; W 2<3C  
 tdc.CreateCompatibleDC(&dc); K/|  
 CBitmap*pOld=tdc.SelectObject(&bm); .&iN(Bd  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); A"4@L*QV  
 tdc.SelectObject(pOld); 3ji:O T  
 BITMAP btm; + |C=ZU  
 bm.GetBitmap(&btm); ^f|<R8`  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; U5<@<j(@  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); o/1JO_41  
 BITMAPINFOHEADER bih; RZh}:  
 bih.biBitCount=btm.bmBitsPixel; X+iK<F$  
 bih.biClrImportant=0; !M(:U,?B  
 bih.biClrUsed=0; 0`n 5x0R  
 bih.biCompression=0; 8=F%+  
 bih.biHeight=btm.bmHeight; Z`s!dV]e9  
 bih.biPlanes=1; \Y e%o}.{  
 bih.biSize=sizeof(BITMAPINFOHEADER); iBoEZEHjw  
 bih.biSizeImage=size; <hv7s,i  
 bih.biWidth=btm.bmWidth; {|6z+vR  
 bih.biXPelsPerMeter=0; s.:r;%a  
 bih.biYPelsPerMeter=0; aZKXD! 4  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); c'0 5{C  
 static int filecount=0; 2~FPw{]j  
 CString name; |I^y0Q:K  
 name.Format("pict%04d.bmp",filecount++); !SF^a6jT  
 name=m_Path+name; J8;Okzb!L  
 BITMAPFILEHEADER bfh; 6Z8l8:r-6  
 bfh.bfReserved1=bfh.bfReserved2=0; _z8;lt   
 bfh.bfType=((WORD)('M'<< 8)|'B'); 0 d4cE10  
 bfh.bfSize=54+size; %v4ZGtKC@  
 bfh.bfOffBits=54; Tpzw=bC^  
 CFile bf; Rd%0\ B  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ KlU qoJ;"  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 9j#@p   
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); A[H;WKn0  
  bf.WriteHuge(lpData,size); C9jbv/c  
  bf.Close(); 0H[LS  
  nCount++; pjN:&#Y]  
 } *Jt8  
 GlobalFreePtr(lpData); ?9e]   
 if(nCount==1) }bMWTT  
  m_Number.Format("%d picture captured.",nCount); J+Bdz6lt  
 else IN^_BKQt  
  m_Number.Format("%d pictures captured.",nCount); V@Wcb$mgk  
  UpdateData(FALSE); uV~e|X "9s  
} :woa&(wN;1  
_M5Xk?e=  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ~NNv>5 t5  
{  %+wF"  
 if(pMsg -> message == WM_KEYDOWN) hhmGv9P  
 { 2-v\3voN  
  if(pMsg -> wParam == VK_ESCAPE) RH1uVdJ1  
   return TRUE; 7Fl-(Nv`  
  if(pMsg -> wParam == VK_RETURN) " H1:0p  
   return TRUE; W-D[z#)/Y  
 } kG^dqqn6  
 return CDialog::PreTranslateMessage(pMsg); ' msmXX@q  
} >IY,be6>P  
yr{B5z,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0M8.U  
{ o:UXPAj  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ `^##b6jH  
  SaveBmp(); 3hS6j S  
  return FALSE; l h/&__  
} M<[ ?g5=#  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ irMd jG  
 CMenu pop; %MJ;Q?KB  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 8#59iQl  
 CMenu*pMenu=pop.GetSubMenu(0); d+}kg  
 pMenu->SetDefaultItem(ID_EXITICON); (1){A8=?o  
 CPoint pt; <xn;bp[  
 GetCursorPos(&pt); de YyaV  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); aws"3O% uW  
 if(id==ID_EXITICON) .7Kk2Y  
  DeleteIcon(); & iSD/W  
 else if(id==ID_EXIT) E*|tOj9`1n  
  OnCancel(); -_~)f{KN@  
 return FALSE; jTSOnF}C~+  
} 5 =Z!hQ}  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Uix{"  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) tt4+m>/T  
 AddIcon(); #D)x}#V\  
 return res; }.{}A(^YR  
} 9;KJr[FQV  
.Z%G@X*  
void CCaptureDlg::AddIcon() >;nS8{2o  
{ Coa-8j*R7  
 NOTIFYICONDATA data; @J vZ[T/  
 data.cbSize=sizeof(NOTIFYICONDATA); >V!LitdJ  
 CString tip; ~L4eZ  
 tip.LoadString(IDS_ICONTIP); D;js.ZF  
 data.hIcon=GetIcon(0); Y\?j0X;  
 data.hWnd=GetSafeHwnd(); arh@`'Q  
 strcpy(data.szTip,tip);  @E_zR  
 data.uCallbackMessage=IDM_SHELL; ^ vbWRG~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; mU G %LM  
 data.uID=98; 8QF`,oXQO  
 Shell_NotifyIcon(NIM_ADD,&data); gb 4pN  
 ShowWindow(SW_HIDE); nGrVw&  
 bTray=TRUE; +t]Xj1Q  
} 3s(Ia^  
v8@eW.I1  
void CCaptureDlg::DeleteIcon()  @Fx@5e  
{ 8D~x\!(p\  
 NOTIFYICONDATA data; rt b*n~  
 data.cbSize=sizeof(NOTIFYICONDATA); k dU! kj  
 data.hWnd=GetSafeHwnd(); @]'S eiNp  
 data.uID=98; Z+idLbIs  
 Shell_NotifyIcon(NIM_DELETE,&data); +?d}7zh  
 ShowWindow(SW_SHOW); HDS"F.l5  
 SetForegroundWindow(); \*"`L3  
 ShowWindow(SW_SHOWNORMAL); km\%BD~  
 bTray=FALSE; <NB41/  
} xmH-!Da  
\G;CQV#{9  
void CCaptureDlg::OnChange() @@} `hii  
{ zvf3b!}  
 RegisterHotkey(); [7W(NeMk  
} \&q=@rJp(z  
_CdROo6I  
BOOL CCaptureDlg::RegisterHotkey() {}\CL#~y  
{ GLh]G(  
 UpdateData(); b!a %YLL  
 UCHAR mask=0; ^M Ey,  
 UCHAR key=0; BaL]mIx  
 if(m_bControl) A=`* r*  
  mask|=4; v>-Y uS  
 if(m_bAlt) F?4Sz#  
  mask|=2; ;^-:b(E  
 if(m_bShift) [7\>"v6  
  mask|=1; r nBOj#N  
  key=Key_Table[m_Key.GetCurSel()]; } uQ${]&D  
 if(bRegistered){ Do;#NLrWb  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); yJD >ny  
  bRegistered=FALSE; y1,5$0@G  
 } U e*$&VlT  
 cMask=mask; {ZqQ!!b  
 cKey=key; K $-;;pUl  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ;KcFy@ 6q5  
 return bRegistered; ?`P2'i<b  
} K{L.ZH>7  
Z?1OdoT-  
  四、小结 "# S>I8d  
e@jfIF0=}  
  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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