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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: F5+!Gb En  
  !FQS9SoO9  
  一、实现方法 V"T5<HA9  
w6ck wn,  
  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: 4 g8t  
EL6<%~,V"I  
#pragma data_seg("shareddata") _`Dz%(c  
HHOOK hHook =NULL; //钩子句柄 \SBAk h  
UINT nHookCount =0; //挂接的程序数目 vvLzUxV  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 u~!Pzz3"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 \Hu?K\SWs  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey zpy&\#Vc  
static int KeyCount =0; }vZTiuzC  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 KDr)'gl&  
#pragma data_seg() 16"L;r  
k;<F33v;Mh  
  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。 xv7nChB  
XvZ5Q  
  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: wsj5;(f+  
)o;n2T#O  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR FX+^S?x.  
cKey,UCHAR cMask) =%{E^z>1  
{ SJlL!<i$  
 BOOL bAdded=FALSE; XcKyrh;i  
 for(int index=0;index<MAX_KEY;index++){ G{.A5{  
  if(hCallWnd[index]==0){ Hiih$O+  
   hCallWnd[index]=hWnd; 9LUk[V  
   HotKey[index]=cKey; +WvW#wpH  
   HotKeyMask[index]=cMask; 7'7o^> !  
   bAdded=TRUE; ?Hbi[YD  
   KeyCount++; lWFm>DiLY  
   break; 3V/f-l]X/  
  } ^t[br6G  
 } 2\#~%D>[  
 return bAdded; 5 HN,y  
} T'7x,8&2|  
//删除热键 mFyYn,Mu|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^mZTki4  
{ ! H4uc  
 BOOL bRemoved=FALSE; CYNpbv  
 for(int index=0;index<MAX_KEY;index++){ ?xt${?KP  
  if(hCallWnd[index]==hWnd){ +}C M2>M  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ G 'CYvV  
    hCallWnd[index]=NULL; u73/#!(1=H  
    HotKey[index]=0; V6b)  
    HotKeyMask[index]=0; J!:v`gb#@A  
    bRemoved=TRUE; 2vW@d[<J  
    KeyCount--; wQU-r|  
    break; r]%.,i7~8  
   } '~76Y9mv  
  } TzrU |D?  
 } $I a-go2W  
 return bRemoved; ^Y^5 @ x=  
} NTSKmCvQG  
BBsZPJ5  
LESF*rh=  
  DLL中的钩子函数如下: L\^H#:?t  
Ec['k&*7,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3M{b:|3/q  
{ Y0nuwX*{  
 BOOL bProcessed=FALSE; fQ,(,^!;  
 if(HC_ACTION==nCode) 9'!I6;M  
 { pl.=u0 *  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 <~Tfi*^+  
   switch(wParam) z|G 39  
   {  $]iRfXv,l!  
    case VK_MENU: Jm}zit:o  
     MaskBits&=~ALTBIT; @_Ly^' "  
     break; Ox f,2r  
    case VK_CONTROL: h_h6@/1l  
     MaskBits&=~CTRLBIT; 0"M0tA#  
     break; Uf-`g>  
    case VK_SHIFT: DYCXzFAa  
     MaskBits&=~SHIFTBIT; (9D,Ukw  
     break; 3yIC@>&y(8  
    default: //judge the key and send message ,6a }l;lv  
     break; {%z}CTf#  
   } hH@pA:`s  
   for(int index=0;index<MAX_KEY;index++){ +yu^Z*_  
    if(hCallWnd[index]==NULL) h>K%Ox R  
     continue; .e2 K\o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;?:X_C  
    { h2edA#bub  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); o8S)8_3  
     bProcessed=TRUE; UjQi9ELoJ  
    } oNBYJ]t  
   } g/m%A2M&aH  
  } ( j~trpe,  
  else if((lParam&0xc000ffff)==1){ //有键按下 ]6EXaf#  
   switch(wParam) 5>[ j^g+@  
   { >a1 ovKF  
    case VK_MENU: g,cl|]/\d  
     MaskBits|=ALTBIT; &:*|KxX  
     break; 'D;'Pr]  
    case VK_CONTROL: %+Khj@aX  
     MaskBits|=CTRLBIT; 4U1"F 7'  
     break; <ba+7CK] w  
    case VK_SHIFT: u<{uUui}$v  
     MaskBits|=SHIFTBIT; b."1p7'  
     break; VR_bX|  
    default: //judge the key and send message jR&AQ-H&  
     break; qbe9 CF'@_  
   } c6)q(zz  
   for(int index=0;index<MAX_KEY;index++){ &\o !-EIK8  
    if(hCallWnd[index]==NULL) awa$o  
     continue; >P\/\xL=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ceqYyVy  
    { ,b8q$ R~\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); K|LS VN?K  
     bProcessed=TRUE; .%EEly  
    } e#$ZOK)`  
   } L1E\^)  
  } s"\o6r ,  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 BpKgUwf;C  
   for(int index=0;index<MAX_KEY;index++){ APR%ZpG  
    if(hCallWnd[index]==NULL) 6?c(ueiL[  
     continue; SpUcrK;1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) M0zlB{eH  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /0H39]y!~  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 A">A@`}  
   } -!]dU`:(X  
  } :S5B3S@|  
 } D;al(q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); vMOit,{  
} jVpk) ;vC  
_'E,g@  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 3_tO  
Kr]`.@/.S  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0BTLIV$d;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5:H9B  
*xOrt)D=  
  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: GlVD!0  
T9+ ?A l  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +}@HtjM  
{ [UHDN:y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) cHMS[.=;  
 { Y+tXWN"8  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Y@Kp'+t(!  
  SaveBmp(); m ,U`hPJ  
  return FALSE; z_p/.kQ'5  
 } *tda_B 2  
 …… //其它处理及默认处理 }]H_|V*f  
} DN@T4!  
$Y4;Xe=  
)5j%."  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 mSzBNvc i  
}X3SjNd q  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 vO2o/   
?q <"!U|e  
  二、编程步骤 +`x8[A)-  
Osdw\NNH~M  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; QMfa~TH#p  
[S/]Vk|4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ]64mSB  
5Qik{cWxBq  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 6 /Apdn1[  
ccJ@jpXI  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; #U NTD4   
yjVPaEu]aU  
  5、 添加代码,编译运行程序。 <"@~  
Nd~?kZZu  
三、程序代码 2 c <Qh=  
%jY /jp=R  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL v 6?{g  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) !z;a>[T'  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ gC#PqK~  
#if _MSC_VER > 1000 xh\{ dUPA  
#pragma once "S43:VH  
#endif // _MSC_VER > 1000 tw]RH(g+#  
#ifndef __AFXWIN_H__ cRX0i;zag  
#error include 'stdafx.h' before including this file for PCH |.Bb Pfe8f  
#endif >'@yq  
#include "resource.h" // main symbols 3I?? K)Yl  
class CHookApp : public CWinApp _1`*&k JL~  
{  # a 'h,  
 public: m[C-/f^u|  
  CHookApp(); '@u/] ra:  
  // Overrides 9(Vq@.;Z`j  
  // ClassWizard generated virtual function overrides /}Y>_8 7  
  //{{AFX_VIRTUAL(CHookApp) ]}cai1  
 public: })|+tZ  
  virtual BOOL InitInstance(); qDO4&NO  
  virtual int ExitInstance(); n}qHt0N  
  //}}AFX_VIRTUAL KD^>Vv#  
  //{{AFX_MSG(CHookApp)  XGEAcN  
  // NOTE - the ClassWizard will add and remove member functions here. !p1OBS|  
  // DO NOT EDIT what you see in these blocks of generated code ! Gv}*T w$  
  //}}AFX_MSG 7{ :| )  
  DECLARE_MESSAGE_MAP() RR><so%  
}; J56+eC(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Te~"\`omJ3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a $g4 )0eS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); d(w $! $"h  
BOOL InitHotkey(); u7&r'rZ1_!  
BOOL UnInit(); 5DfAL;o!  
#endif <$n%h/2%  
tgDmHxB]0  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 9/RbfV[)  
#include "stdafx.h" SM5i3EcFYP  
#include "hook.h"  c/I.`@  
#include <windowsx.h> oq=D9  
#ifdef _DEBUG ~<3qsA..  
#define new DEBUG_NEW k`r}Gb  
#undef THIS_FILE :*e0Z2=  
static char THIS_FILE[] = __FILE__; 8f% @  
#endif viAvD6e  
#define MAX_KEY 100 N7*JL2Rnq  
#define CTRLBIT 0x04 ]YZ+/:#U7  
#define ALTBIT 0x02 -3X#$k8  
#define SHIFTBIT 0x01 =eSG7QfS  
#pragma data_seg("shareddata") 7Rj!vj/  
HHOOK hHook =NULL; ,*r"cmz  
UINT nHookCount =0; *~fZ9EkD  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey |^Z1 D TAw  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT L*9^-,  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey VY@uQ#&A  
static int KeyCount =0; /g712\?M4  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift N<:5 r  
#pragma data_seg() *J?QXsg  
HINSTANCE hins; d5]9FIj  
void VerifyWindow(); Y*O7lZuF%  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) xUPM-eF=  
//{{AFX_MSG_MAP(CHookApp) ,:QG%Et  
// NOTE - the ClassWizard will add and remove mapping macros here. [b J/$A  
// DO NOT EDIT what you see in these blocks of generated code! e%j+,)Ry  
//}}AFX_MSG_MAP : KZI+  
END_MESSAGE_MAP() ;k/y[ x}  
^v3ytS  
CHookApp::CHookApp() 1^R@X  
{ 6!/e_a  
 // TODO: add construction code here, h/`OG>./  
 // Place all significant initialization in InitInstance Oe^3YOR#j{  
} SZ~Ti|^  
R,/?p  
CHookApp theApp; ()K%Rn  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) X\hD 4r"  
{ '+Dn~8Y+9  
 BOOL bProcessed=FALSE; )m"NO/sJ2  
 if(HC_ACTION==nCode) (zBa2Vmmv  
 { 9IMtqL&  
  if((lParam&0xc0000000)==0xc0000000){// Key up 0kpRvdEr-  
   switch(wParam) {LY$  
   { :HRJ49a  
    case VK_MENU: zrE ~%YR  
     MaskBits&=~ALTBIT; on(F8%]zE  
     break; 6CLrP} u  
    case VK_CONTROL: Q0!gTV  
     MaskBits&=~CTRLBIT; J:'cj5@  
     break; 75@){ :  
    case VK_SHIFT: !~m)_Q5?~  
     MaskBits&=~SHIFTBIT; tk<dp7y7  
     break; HLAWx/c,j"  
    default: //judge the key and send message ,$mnD@)  
     break; G|Ic6Sd  
   } &m`1lxT  
   for(int index=0;index<MAX_KEY;index++){ vML01SAi  
    if(hCallWnd[index]==NULL) ,2[laJ  
     continue; Tm_AoZH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sZPPS&KoP3  
    { RERum  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); zVZZdG~8  
     bProcessed=TRUE; hv}rA,Yd  
    } #wNksh/J^  
   } EkEM|<GNd  
  } AASw^A3p  
  else if((lParam&0xc000ffff)==1){ //Key down )}=`Gx5+  
   switch(wParam) cG,B;kMjo  
   { 1s=M3m&H  
    case VK_MENU: "Q A#  
     MaskBits|=ALTBIT; lOPCM1Se  
     break; @ I LG3"  
    case VK_CONTROL: d[w'j/{  
     MaskBits|=CTRLBIT; B1JdkL 3h  
     break; utQE$0F  
    case VK_SHIFT: nE+sbfC   
     MaskBits|=SHIFTBIT; 4!d&Zc>C4  
     break; B+iVK(j'[v  
    default: //judge the key and send message @ _U]U  
     break; MJV)| 2C  
   } Iujly f  
   for(int index=0;index<MAX_KEY;index++) ?a7PxD.  
   { n wToZxHZ~  
    if(hCallWnd[index]==NULL) >,y291p2  
     continue; W@`Nn*S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3)T'&HKQ  
    { *O#%hTYq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); kUmrJBh$  
     bProcessed=TRUE; '49&qO5B  
    } =2\k Jv3  
   } nY'0*:'u  
  } 1<fS&)^W  
  if(!bProcessed){ rC14X}X6  
   for(int index=0;index<MAX_KEY;index++){ \$/)o1SG  
    if(hCallWnd[index]==NULL) 5CueD]  
     continue; yN5g]U. Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Y]P'; C_eP  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wP/&k`HQ#i  
   } 'LpJ:Th  
  } `g<@F^x5  
 } 7u6o~(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); BdG~y1%:  
} "2i{ L '  
3DV';  
BOOL InitHotkey() .|JJyjRA+  
{ v98=#k!F  
 if(hHook!=NULL){ xM8}Xo  
  nHookCount++; fB:9:NX  
  return TRUE; hq6fDRO/4  
 } f'0n^mSP  
 else aA-A>z  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 4!i`9w$$"  
  if(hHook!=NULL) ^rfY9qMJr8  
   nHookCount++; [!]a' T#x  
  return (hHook!=NULL); @v ss:'l  
} \6-x~%xK  
BOOL UnInit() )y\^5>p[  
{ Ds9pXgU( Z  
 if(nHookCount>1){ ,3.E]_3 xX  
  nHookCount--; L)a8W   
  return TRUE; OKNA36cU'  
 } h=.|!u  
 BOOL unhooked = UnhookWindowsHookEx(hHook); nW3-)Q89  
 if(unhooked==TRUE){ pzbR.L}'D  
  nHookCount=0; );_g2=:#  
  hHook=NULL; dFS>uIT7X  
 } Yc3\NqQM  
 return unhooked; !jN}n)FSq  
} l9lBhltOH  
1"?KQU  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) x9Fga_  
{ u pg?  
 BOOL bAdded=FALSE;  U":hJ*F)  
 for(int index=0;index<MAX_KEY;index++){ l~;H~h!h/  
  if(hCallWnd[index]==0){ 4*}[h9J}\  
   hCallWnd[index]=hWnd; l Q]&:%^\  
   HotKey[index]=cKey; rmu5K$pl  
   HotKeyMask[index]=cMask; I@+h| n  
   bAdded=TRUE; j2c -01}  
   KeyCount++; S_/9eI~X  
   break; <`i " 5`J  
  } 15+>W4v  
 } |!E>I  
 return bAdded; -=iGl5P?  
} "~(qp_AI  
z8_m<uewz  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ns[v.YDL  
{ 1 0lvhzU  
 BOOL bRemoved=FALSE; L6./b;  
 for(int index=0;index<MAX_KEY;index++){ |iKk'Rta4  
  if(hCallWnd[index]==hWnd){ (9% ki$=}+  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >A5R  
    hCallWnd[index]=NULL; %@#+Xpa+  
    HotKey[index]=0; ^hzlR[  
    HotKeyMask[index]=0; f uQbDb&  
    bRemoved=TRUE; $h`(toTyF  
    KeyCount--; !O6e,l  
    break; '9c`[^  
   } GL[#XB>n  
  } 4z#{nZG  
 } NdGIH/Y;M  
 return bRemoved; p4C w#)BaS  
} ZQXv-"  
u?5 d%]*  
void VerifyWindow() R''nZ/R  
{ ) DXN|<A  
 for(int i=0;i<MAX_KEY;i++){ 0]4kR8R3[  
  if(hCallWnd!=NULL){ %tul(Z~<1  
   if(!IsWindow(hCallWnd)){ [Oen{c9 A  
    hCallWnd=NULL; %KHO}gad1  
    HotKey=0; 8@]*X,umc  
    HotKeyMask=0; W^npzgDCo  
    KeyCount--; .) uUpY%K^  
   } B4yU}v  
  } *GleeJWz  
 } |x@)%QeC  
} PtCO';9[  
NAjY,)>'K  
BOOL CHookApp::InitInstance() G6(k wv4  
{ 4)0 %^\p  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); QEKSbxL\W  
 hins=AfxGetInstanceHandle(); [zv>Wlf,%  
 InitHotkey(); !l|v O(  
 return CWinApp::InitInstance(); 2_M+akqy^  
} 4 AZ~<e\  
T Po%zZo  
int CHookApp::ExitInstance() z%$ E6Im  
{ oFM\L^Y?$$  
 VerifyWindow(); psyxNM=dN#  
 UnInit(); 7ksh%eV  
 return CWinApp::ExitInstance(); .] mYpz  
} 9qN4f8R  
~,+n_KST;  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file j[l6&eX  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) xFxl9oM."  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Mx{VN P  
#if _MSC_VER > 1000 o|Cq#JFG  
#pragma once OzY55  
#endif // _MSC_VER > 1000 FdEzt  
Atsi}zTR\  
class CCaptureDlg : public CDialog mkgGX|k;  
{ 6hDK;J J&  
 // Construction b ?9c\-}  
 public: i{[=N9U5o  
  BOOL bTray; DTmv2X  
  BOOL bRegistered; )*#Pp )Q  
  BOOL RegisterHotkey(); H,,-;tN?  
  UCHAR cKey; u$ [R>l9  
  UCHAR cMask; +13h *  
  void DeleteIcon(); wI.i\ S  
  void AddIcon(); Vcn04j#Q  
  UINT nCount; 2{;&c  
  void SaveBmp(); J$6h% Eyo  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7jvy]5y8&~  
  // Dialog Data GslUN% UJr  
  //{{AFX_DATA(CCaptureDlg) HDQhXw!!hc  
  enum { IDD = IDD_CAPTURE_DIALOG }; j,%@%upM  
  CComboBox m_Key; xw_VK1  
  BOOL m_bControl; vzV,} S*c  
  BOOL m_bAlt; n][/c_]q  
  BOOL m_bShift; 3ThBy'  
  CString m_Path; S Y\ UuZ  
  CString m_Number; S<}2y9F  
  //}}AFX_DATA ].F7. zi  
  // ClassWizard generated virtual function overrides zRTR  
  //{{AFX_VIRTUAL(CCaptureDlg) :#D?b.=  
 public: Vp8t8X1`  
  virtual BOOL PreTranslateMessage(MSG* pMsg); }s)MDq9  
 protected: )"k>}&'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~^d. zIN!  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); UjibQl 3:m  
  //}}AFX_VIRTUAL 272j$T  
  // Implementation C yg e  
 protected: #o Rm-yDr  
  HICON m_hIcon; +./c=o/v  
  // Generated message map functions XMhDx  
  //{{AFX_MSG(CCaptureDlg) Y[%1?CREP  
  virtual BOOL OnInitDialog(); 3TUW+#[Gu  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ] jbQou@  
  afx_msg void OnPaint(); GMmz`O XN  
  afx_msg HCURSOR OnQueryDragIcon(); g8^\|  
  virtual void OnCancel(); W>C!V  
  afx_msg void OnAbout(); v*Tliw`-U  
  afx_msg void OnBrowse(); dWHl<BUm  
  afx_msg void OnChange(); v|5:;,I  
 //}}AFX_MSG is=sV:j:  
 DECLARE_MESSAGE_MAP() +mRFHZG  
}; FR~YO|4?  
#endif ?^Sk17G  
WrK!]17or  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file rZRcy9$y>  
#include "stdafx.h" NGYliP,.6  
#include "Capture.h" 5dffF e  
#include "CaptureDlg.h" ]zp5 6U|xa  
#include <windowsx.h> 3:Bwf)*  
#pragma comment(lib,"hook.lib")  !sda6?&  
#ifdef _DEBUG }e3M5LI1L  
#define new DEBUG_NEW whb|N2  
#undef THIS_FILE DLMG<4Cd~  
static char THIS_FILE[] = __FILE__; e$F]t *)Xa  
#endif z;1y7W!v  
#define IDM_SHELL WM_USER+1 =Y`P}vI]w%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Rz}?@zh_8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); n}==  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; .DSn H6O  
class CAboutDlg : public CDialog (IX iwu  
{ ^l1tQnj)7  
 public: =H*}{'#  
  CAboutDlg(); F#=XJYG1  
  // Dialog Data t~pA2?9@  
  //{{AFX_DATA(CAboutDlg) {MmHR  
  enum { IDD = IDD_ABOUTBOX }; `@GqD  
  //}}AFX_DATA 9k\`3SE  
  // ClassWizard generated virtual function overrides =! v.VF\;  
  //{{AFX_VIRTUAL(CAboutDlg) ;t47cUm6j  
 protected: *S_e:^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support | \Nj  
  //}}AFX_VIRTUAL /64jO?mp  
  // Implementation 8r[ZGUV  
 protected: ;/i"W   
  //{{AFX_MSG(CAboutDlg) vQrce&  
  //}}AFX_MSG Ta#vD_QP  
  DECLARE_MESSAGE_MAP() u#5/s8  
}; FFXDt"i2  
.0]4@'  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) d_9Fc" C~  
{ Hj ]$  
 //{{AFX_DATA_INIT(CAboutDlg) PoMkFG6  
 //}}AFX_DATA_INIT ps0wN%tA  
} f`<j(.{9F  
]2G5ng' @  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) <%eY>E  
{ `B+%W  
 CDialog::DoDataExchange(pDX); yu"Ii-9z  
 //{{AFX_DATA_MAP(CAboutDlg) 2}j2Bhc  
 //}}AFX_DATA_MAP ={' "ATX(U  
} ^_4TDC~h  
'^'4C'J  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1@IRx{v$  
 //{{AFX_MSG_MAP(CAboutDlg)  j`^':!  
 // No message handlers "^-U#f>k  
 //}}AFX_MSG_MAP M9Gs^  
END_MESSAGE_MAP() .4={K)kz|F  
5zJkPki  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~ `2w ul  
: CDialog(CCaptureDlg::IDD, pParent) CCKg,v  
{ WtI1h`Fo  
 //{{AFX_DATA_INIT(CCaptureDlg) GypZ!)1  
  m_bControl = FALSE; 8xhXS1  
  m_bAlt = FALSE; GZT}aMMSJ  
  m_bShift = FALSE; }C>Q  
  m_Path = _T("c:\\"); '|^LNAx  
  m_Number = _T("0 picture captured."); dJ\6m!Mp  
  nCount=0; A9PXu\%y  
  bRegistered=FALSE; q0WW^jwQ  
  bTray=FALSE; PJj{5,#@3  
 //}}AFX_DATA_INIT =/=x"q+X  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Ab7hW(/  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); / uI/8>p(  
} oR}ir  
y8: 0VZox  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Okk[}G)  
{ 4W8rb'B!Ay  
 CDialog::DoDataExchange(pDX); |Hn[XRsf  
 //{{AFX_DATA_MAP(CCaptureDlg) q! W ~>c!  
  DDX_Control(pDX, IDC_KEY, m_Key); 1!8*mk_R{  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 20m6-rkI<}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); P Y +~,T2  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); O<4i)Lx2  
  DDX_Text(pDX, IDC_PATH, m_Path); 2>Kq)Ii  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 1_:1cF{w  
 //}}AFX_DATA_MAP UwtOlV:G{  
} Ku LZg  
wo2^,Y2z+  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) g$VcT\X  
//{{AFX_MSG_MAP(CCaptureDlg) cJA0$)JP&  
 ON_WM_SYSCOMMAND() x( w <U1  
 ON_WM_PAINT() O%9Cq}*  
 ON_WM_QUERYDRAGICON() 'R*gSqx~  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ($(6]?J(?7  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) T(+F6d=1  
 ON_BN_CLICKED(ID_CHANGE, OnChange) V5rnI\:7  
//}}AFX_MSG_MAP ^7q=E@[e  
END_MESSAGE_MAP() $gDp-7  
n ! qm  
BOOL CCaptureDlg::OnInitDialog() $N;!. 5lX3  
{ Lhl) pP17  
 CDialog::OnInitDialog(); a#H=dIj  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); x$CpUy{6  
 ASSERT(IDM_ABOUTBOX < 0xF000); oT 8  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Td[w<m+p<P  
 if (pSysMenu != NULL) Ga f/0/|  
 { 0w\X  
  CString strAboutMenu; DjOFfD\MF  
  strAboutMenu.LoadString(IDS_ABOUTBOX); B0=:A  
  if (!strAboutMenu.IsEmpty()) 2a.NWJS  
  { pALB[;9g  
   pSysMenu->AppendMenu(MF_SEPARATOR); )xQxc.  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0vG}c5;F  
  } hM\QqZFyp  
 } Te'^O,C)y$  
 SetIcon(m_hIcon, TRUE); // Set big icon hx4!P(o1  
 SetIcon(m_hIcon, FALSE); // Set small icon ==x3|^0y  
 m_Key.SetCurSel(0); =khjD[muC  
 RegisterHotkey(); 3FUZTX]Q1  
 CMenu* pMenu=GetSystemMenu(FALSE); $Br^c< y  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); P@9>4}r$  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ,<hXNN  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); )I]E%ut{4,  
 return TRUE; // return TRUE unless you set the focus to a control Tp`)cdcC[  
} >|0yH9af  
N)Qj^bD!  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 1ISA^< M  
{ Qm`f5-d  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) uW>AH@Pij  
 { M0Z>$Az]t  
  CAboutDlg dlgAbout; _WK+BxH  
  dlgAbout.DoModal(); 2?t(%uf]  
 } e::5|6x  
 else  hPr  
 { #!#V!^ o  
  CDialog::OnSysCommand(nID, lParam); d\;M F  
 } dMGu9k~u  
} N["c*=x  
ZfT%EPoZ:  
void CCaptureDlg::OnPaint() -Qnnzp$]  
{ nWFp$tJ/R  
 if (IsIconic()) ^'EEry  
 { :^%s oEi  
  CPaintDC dc(this); // device context for painting 8g>jz 8  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /l(:H  
  // Center icon in client rectangle q,nj|9z V  
  int cxIcon = GetSystemMetrics(SM_CXICON); gEKJrAA  
  int cyIcon = GetSystemMetrics(SM_CYICON); }/c.>U  
  CRect rect; jLr8?Hyf  
  GetClientRect(&rect); 4L!{U@ '  
  int x = (rect.Width() - cxIcon + 1) / 2; |<y[gj4`T/  
  int y = (rect.Height() - cyIcon + 1) / 2;  pMt]wyKr  
  // Draw the icon W\eB   
  dc.DrawIcon(x, y, m_hIcon); tHoFnPd\|  
 } Va=0R   
 else AN: ,t(w  
 { f~Kln^  
  CDialog::OnPaint(); ! FHNKh  
 } q<c).4  
} [&NF0c[i  
R$6Y\ *L[  
HCURSOR CCaptureDlg::OnQueryDragIcon() }QJE9;<e  
{ Slv}6at5  
 return (HCURSOR) m_hIcon; AL|fL  
} Fg#*rzA  
0RoI`>j'  
void CCaptureDlg::OnCancel() 8w2+t>?  
{ ?9?0M A<[i  
 if(bTray) X0vkdNgW  
  DeleteIcon(); &)s A(  
  CDialog::OnCancel(); 1pzU=!R?-O  
} AZl=w`;/O%  
Q|5wz]!5Y(  
void CCaptureDlg::OnAbout() &<_sXHg<x  
{ &OI=r vDmo  
 CAboutDlg dlg; t:=Ui/!q  
 dlg.DoModal(); J|xqfY@+  
} 5yA^n6  
QJ"B d`wc  
void CCaptureDlg::OnBrowse() vpXS!o>/Sn  
{ +e ?ixvld  
 CString str; {xM%3  
 BROWSEINFO bi; ~]"}s(J;  
 char name[MAX_PATH]; Q;5\( 0w5  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); HwU \[f  
 bi.hwndOwner=GetSafeHwnd(); *3 9sh[*}  
 bi.pszDisplayName=name; 3N]pN<3@  
 bi.lpszTitle="Select folder"; _&F6As !{  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; /o|@]SAe.  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); e'\I^'`!M  
 if(idl==NULL) p~3CXmUc~  
  return; ; $y.+5 q  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); R4IFl z  
 str.ReleaseBuffer(); xY!]eLZ)&  
 m_Path=str; 3I"&Qp%2  
 if(str.GetAt(str.GetLength()-1)!='\\') K] Eq"3  
  m_Path+="\\"; sS-5W-&P{T  
 UpdateData(FALSE); c&0IJ7fZG  
} Pi8U}lG;  
a?JU(  
void CCaptureDlg::SaveBmp() x(S 064  
{ tY[y?DJ  
 CDC dc; wh*OD  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); q1?2 U<  
 CBitmap bm; x7NxHTL  
 int Width=GetSystemMetrics(SM_CXSCREEN); RIJBHOa  
 int Height=GetSystemMetrics(SM_CYSCREEN); q!AS}rV  
 bm.CreateCompatibleBitmap(&dc,Width,Height); iz*aBXVA[  
 CDC tdc; |Cen5s W&  
 tdc.CreateCompatibleDC(&dc); H<NYm#a"  
 CBitmap*pOld=tdc.SelectObject(&bm); 1/&j'B  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); P%/+?(?  
 tdc.SelectObject(pOld); "V9!srIC  
 BITMAP btm; `E|IMUB~  
 bm.GetBitmap(&btm); dUe"qH29s  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; I) Y$?"  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |Zt=8}di  
 BITMAPINFOHEADER bih; jM7}LV1Ck  
 bih.biBitCount=btm.bmBitsPixel; MI@ RdXkY  
 bih.biClrImportant=0; zM@iG]?kc  
 bih.biClrUsed=0; 2<988F  
 bih.biCompression=0; *50Ykf  
 bih.biHeight=btm.bmHeight; Aga7X@fV(  
 bih.biPlanes=1; ikxSWO_Y=  
 bih.biSize=sizeof(BITMAPINFOHEADER); hG ]jm  
 bih.biSizeImage=size; |Pj _L`G  
 bih.biWidth=btm.bmWidth; \DQ;v  
 bih.biXPelsPerMeter=0; Jx{,x-I  
 bih.biYPelsPerMeter=0; X,OxvmDm  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _X]?  
 static int filecount=0; |/<iydP  
 CString name; Uc6U!X  
 name.Format("pict%04d.bmp",filecount++); R/b=!<  
 name=m_Path+name; 2#E;5UYu  
 BITMAPFILEHEADER bfh; *uv\V@0  
 bfh.bfReserved1=bfh.bfReserved2=0; CI  @I  
 bfh.bfType=((WORD)('M'<< 8)|'B'); UWusSi3+LG  
 bfh.bfSize=54+size; {K|{a  
 bfh.bfOffBits=54; ~(&xBtg:}  
 CFile bf; jWoo{+=D  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ P{qn@:  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 7P\sn<  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); FcWu#}.p}  
  bf.WriteHuge(lpData,size); B[$SA-ZHi  
  bf.Close(); &1?Q]ZRp  
  nCount++; qh&K{r*T  
 } 6Edqg   
 GlobalFreePtr(lpData); QU#/(N(U#T  
 if(nCount==1) zh4o<f:-  
  m_Number.Format("%d picture captured.",nCount); snK9']WXo  
 else H~$|y9>qI  
  m_Number.Format("%d pictures captured.",nCount); #`W8-w  
  UpdateData(FALSE); XG [%oL  
} /z'j:~`E  
R1 wd Q8q  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 4({=(O  
{ ,>g 6OU2~6  
 if(pMsg -> message == WM_KEYDOWN) .6'T;SoK>  
 {  (&gCVf  
  if(pMsg -> wParam == VK_ESCAPE) !l\pwfXP&%  
   return TRUE; UbYKiLDF)  
  if(pMsg -> wParam == VK_RETURN) Mr1pRIYMd  
   return TRUE; (%r:PcGMEV  
 } u3<])}I'  
 return CDialog::PreTranslateMessage(pMsg); WkO .  
} I3L1|!  
x[?_F  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) wXZ-%,R -D  
{ Zn^E   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \GWq0z&  
  SaveBmp(); {otvJ |'N  
  return FALSE;  I&v B\A  
} }.hBmhnZmI  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @%TQ/L^|  
 CMenu pop; ECSC,oJ  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Hv=coS>g:  
 CMenu*pMenu=pop.GetSubMenu(0); \.{JS>!  
 pMenu->SetDefaultItem(ID_EXITICON); fSP~~YSeU  
 CPoint pt; ~q4y'dBy*  
 GetCursorPos(&pt); [6Wr t8"  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); EtL=_D-  
 if(id==ID_EXITICON) Mfz5:'  
  DeleteIcon(); F?dTCa  
 else if(id==ID_EXIT) 980+Y  
  OnCancel(); Oh^X^*I$@  
 return FALSE; 8%NX)hZyq}  
} dqe_&C@*O  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ^g0 Ig2'  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) E`s_Dr}K  
 AddIcon(); pQ/:*cd+M  
 return res; L fi]s  
} }E=kfMu  
tyDtwV|  
void CCaptureDlg::AddIcon() 9w(j2i q  
{ K1hw' AaQ  
 NOTIFYICONDATA data; OYzJE@r^  
 data.cbSize=sizeof(NOTIFYICONDATA); ZN)/doK  
 CString tip; SB;Wa%  
 tip.LoadString(IDS_ICONTIP); >}I}9y+  
 data.hIcon=GetIcon(0); }+B7C2_\  
 data.hWnd=GetSafeHwnd(); =#u2Rx%V  
 strcpy(data.szTip,tip); h1Lp:@:|  
 data.uCallbackMessage=IDM_SHELL; \uYUX~}i"  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; >hhd9  
 data.uID=98; Uyh   
 Shell_NotifyIcon(NIM_ADD,&data); M&K@><6k,k  
 ShowWindow(SW_HIDE); ufJFS+?  
 bTray=TRUE; <hea%6  
} CxRp$;rk  
WLpn,8qsY  
void CCaptureDlg::DeleteIcon() OBZ|W**N"  
{ /X:lt^?%I  
 NOTIFYICONDATA data; @U)'UrNr~  
 data.cbSize=sizeof(NOTIFYICONDATA); 6M6QMg^  
 data.hWnd=GetSafeHwnd(); ,'9tR&S$_  
 data.uID=98; U %4g:s  
 Shell_NotifyIcon(NIM_DELETE,&data); J!H5{7.efN  
 ShowWindow(SW_SHOW); w(yU\ N  
 SetForegroundWindow(); qYh,No5\;t  
 ShowWindow(SW_SHOWNORMAL); -3V~YhG  
 bTray=FALSE; i`Yf|^;@2>  
} b'OO~>86  
!69^ kIi$  
void CCaptureDlg::OnChange() -r2cK{Hhp&  
{ cU>&E* wD  
 RegisterHotkey(); 7m jj%  
} QA3l:D}u  
KZE.}8^%D  
BOOL CCaptureDlg::RegisterHotkey() ZChY:I$<  
{ e!8_3BE  
 UpdateData(); R*y[/Aw  
 UCHAR mask=0; .~8+s.y  
 UCHAR key=0; :+5afv}  
 if(m_bControl) {aL$vgYT1  
  mask|=4; :}-u`K*  
 if(m_bAlt) NWg\{a  
  mask|=2; EzyIsp> _  
 if(m_bShift) G225Nz;Y*  
  mask|=1; <8bO1t^*  
  key=Key_Table[m_Key.GetCurSel()]; ~ /[Cgh0  
 if(bRegistered){ CvW((<?  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); RmQt%a7\{  
  bRegistered=FALSE;  LJ))  
 } e.+)0)A-  
 cMask=mask; <It7s1O  
 cKey=key; @}Ixr{t  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $SXxAS1  
 return bRegistered; I5A^/=bf&  
} 10rGA=x'(  
b>z.d-  
  四、小结 Z:hrrq9  
hq*JQb;Y}  
  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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