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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: Sh RkL<  
  oi}\;TG  
  一、实现方法 IDr$Vu4LCW  
Vch!&8xii  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 'aW<C>  
s7TV@Y)  
#pragma data_seg("shareddata") 5T;,wQ<  
HHOOK hHook =NULL; //钩子句柄 FR@## i$  
UINT nHookCount =0; //挂接的程序数目 >QM$ NIf@  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ij~023$DTt  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 'HDbU#vD  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey B#;yko  
static int KeyCount =0; ^YG.eT6iG  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 J#'+&D H  
#pragma data_seg() k,nRC~Irh  
d6hso  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 /R44x\nhr  
g>*t"Rf:  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: :X;AmLf`2u  
m]NyEMYg  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR =!%+ sem  
cKey,UCHAR cMask) d^.fB+)A3  
{ {|J'd+  
 BOOL bAdded=FALSE; _GK3]F0  
 for(int index=0;index<MAX_KEY;index++){ +e%U6&l{  
  if(hCallWnd[index]==0){ L'Fy\K\  
   hCallWnd[index]=hWnd; !xxu~j^T  
   HotKey[index]=cKey; zWh[U'6  
   HotKeyMask[index]=cMask; p4OiCAW;  
   bAdded=TRUE; pZ4]oK\*  
   KeyCount++; ^.9I[Umua  
   break; R_2JP C  
  } U:.  
 } *!*J5/ b  
 return bAdded; p7;/| ]o3  
} ^L1#  
//删除热键 ;9R;D,Gk!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) P]G`Y>#$r  
{ B)M& FO  
 BOOL bRemoved=FALSE; 058+_xX  
 for(int index=0;index<MAX_KEY;index++){ ?][2J  
  if(hCallWnd[index]==hWnd){ zU9G: jH  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ nVC:5ie  
    hCallWnd[index]=NULL; ~agzp`!M  
    HotKey[index]=0; I!ykm\<  
    HotKeyMask[index]=0; ]jz%])SzH  
    bRemoved=TRUE; ui:  
    KeyCount--; w8Mi: ;6  
    break; N'nqVYTU  
   } /i]!=~\qFs  
  } _/_1:ivY8  
 } @]#0jiS  
 return bRemoved; Dm j^aFB0|  
} Xp=Y<`dX  
_ G!lQ)1  
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  DLL中的钩子函数如下: |yi3y `f  
6s833Tmb&r  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) xP.B,1\X  
{ fa#]G^f  
 BOOL bProcessed=FALSE; IPU'M*|Q  
 if(HC_ACTION==nCode) U-ILzK  
 { s7C oUd2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 0}YR=  
   switch(wParam) %6}S'yL  
   {  Y WSo:)LY  
    case VK_MENU: n<p`OKIV3  
     MaskBits&=~ALTBIT; \fphM6([RK  
     break; OYJy;u3"  
    case VK_CONTROL: aXyu%<@k  
     MaskBits&=~CTRLBIT; zi23k=  
     break; z[DUktZl  
    case VK_SHIFT: [IVT0 i  
     MaskBits&=~SHIFTBIT; 2,O-/A;tW*  
     break; )EYsqj  
    default: //judge the key and send message Ru Q\H0pr  
     break; z0Vd(QL  
   } O`O{n_o^u  
   for(int index=0;index<MAX_KEY;index++){ c h<Fi%)  
    if(hCallWnd[index]==NULL) Hw5\~!FX  
     continue; $V~r*#$.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z&=K+P  
    { 2#LcL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =iRi 9r'l  
     bProcessed=TRUE; y UQ;tTI  
    } d3T|N\(DL  
   } 5M{N-L_eC  
  } Tk9*@kqv  
  else if((lParam&0xc000ffff)==1){ //有键按下 ](NSpU|*  
   switch(wParam) |H5){2V>K  
   { -Q;5A;sr2  
    case VK_MENU: 6hYv  
     MaskBits|=ALTBIT; ]DdD FLM  
     break; )$yqJ6y5  
    case VK_CONTROL: epm  t  
     MaskBits|=CTRLBIT; c6s*u%+},  
     break; kf0zL3|   
    case VK_SHIFT: ]y$D@/L@  
     MaskBits|=SHIFTBIT; ;u,%an<(  
     break; 673v  
    default: //judge the key and send message C^Tc9  
     break; uJMF\G=nb  
   } aZ2liR\QE  
   for(int index=0;index<MAX_KEY;index++){ Z?[;Japg  
    if(hCallWnd[index]==NULL) F&;g< SD  
     continue; kjN9(&D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) x2/|i? ZO  
    { 9x&,`95O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); g8mVjM\B;  
     bProcessed=TRUE; y<k-dbr  
    } 7'j?GzaQ+  
   } q#I/N$F  
  } `?rPs8+R  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 >Fz_]z   
   for(int index=0;index<MAX_KEY;index++){ TF|GGY i  
    if(hCallWnd[index]==NULL) k\Oy\z@  
     continue; W$N_GR'4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Xgd!i}6Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); B[C2uVEX:  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 qDhz|a#  
   } H]"Z_n_  
  } 6*kY7  
 } C>N)~Ut  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]ss0~2  
} _+wou(1y  
4eYj.=I  
  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: >AV-i$4eQ@  
HV&N(;@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =nA;,9%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l:8gCi  
}Nl-3I.S^  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: v/8K?$"q  
:r:5a(sq  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8~EDmg[  
{ `9s5 *;Z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) iF{eGi  
 { WY?(C@>s  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 f<uLbJ6  
  SaveBmp(); '_g8fz 3  
  return FALSE; Vg\EAs>f  
 } f 7y1V(t  
 …… //其它处理及默认处理 X;v/$=-mz  
} 0DIaXdOdW+  
@&S4j]rq  
'+Gt+Gq+  
  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。 !?Z}b.%W  
ZdlZ,vK^.  
  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。 J Q%e'  
{w(6Tc  
  二、编程步骤 2 Nr j@q  
x7t<F4  
  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"; ' ,a'r.HJH  
}7g\1l\  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; O=MO M  
d&(GIH E&d  
  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; L<J';#BD  
}v;@1[.B  
  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~POS'1  
)j4]Y dJ  
  5、 添加代码,编译运行程序。 z\oq b) a  
vZTX3c:,1  
三、程序代码 d\3L.5]X  
:7e2O!zH_  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL vy,ER<  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 82YTd(yB  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ =~?2i)-mC  
#if _MSC_VER > 1000 d@b"tb}R  
#pragma once UVUbxFq:  
#endif // _MSC_VER > 1000 uPsn~>(4  
#ifndef __AFXWIN_H__ f:B+R  
#error include 'stdafx.h' before including this file for PCH F6}Pwz[c  
#endif sI@m"A  
#include "resource.h" // main symbols q<@f3[A  
class CHookApp : public CWinApp TixH Ehw  
{ go|/I&  
 public: S s@\'K3e  
  CHookApp(); UkG|5P`  
  // Overrides R N5\,>+  
  // ClassWizard generated virtual function overrides #y&3`Nz3  
  //{{AFX_VIRTUAL(CHookApp) 1 C{n!l  
 public: hW~,Uqy  
  virtual BOOL InitInstance(); gLsl/G  
  virtual int ExitInstance(); ;'`T  
  //}}AFX_VIRTUAL G':mc{{  
  //{{AFX_MSG(CHookApp) zQ(li9  
  // NOTE - the ClassWizard will add and remove member functions here. T@U_;v|rf  
  // DO NOT EDIT what you see in these blocks of generated code ! aG%KiJ7KEN  
  //}}AFX_MSG hvtg_w6K  
  DECLARE_MESSAGE_MAP() `ihlKFX  
}; eZ[CqUJ&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ecA:y!N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); jJQ6]ucwa  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `4'v)!?  
BOOL InitHotkey(); pZ/x,b#.  
BOOL UnInit(); kUUN2  
#endif 4rO07)~l  
WB'&W=  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. |qH-^b.F  
#include "stdafx.h" yH;=Y1([  
#include "hook.h" |P$tLOrG  
#include <windowsx.h> N$aLCX  
#ifdef _DEBUG :UoZ`O~  
#define new DEBUG_NEW cWl  
#undef THIS_FILE R 3TdQ6j  
static char THIS_FILE[] = __FILE__; gGxgU$`#c  
#endif T\:Vu{|  
#define MAX_KEY 100 Y#V`i K  
#define CTRLBIT 0x04 +XLy Pj  
#define ALTBIT 0x02 X~*1  
#define SHIFTBIT 0x01 b6RuYwHWV0  
#pragma data_seg("shareddata") Yz us=  
HHOOK hHook =NULL; "EQ`Q=8  
UINT nHookCount =0; a}|B[b  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey s]#D;i8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT f>k]{W Y  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey q!\K!W\  
static int KeyCount =0; oS 7q#`  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift TppR \[4]  
#pragma data_seg() qZ'&zB)  
HINSTANCE hins; =H%c/Jty  
void VerifyWindow(); |Gx-c ,{{  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) _Jx.?8  
//{{AFX_MSG_MAP(CHookApp) \L>3E#R-Q  
// NOTE - the ClassWizard will add and remove mapping macros here. 2 DJs '"8  
// DO NOT EDIT what you see in these blocks of generated code! 1//d68*"  
//}}AFX_MSG_MAP +)k%jIi!  
END_MESSAGE_MAP() LX[<Wh_X(  
@d:TAwOI'  
CHookApp::CHookApp() g VX  
{ es 8%JTi  
 // TODO: add construction code here, H:Y?("k  
 // Place all significant initialization in InitInstance 1v)ur\>R  
} %ZF47P%6  
tGDsZ;3Yr  
CHookApp theApp; /FJ )gQYA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) C ?JcCD2  
{ uDvZ]Q|.  
 BOOL bProcessed=FALSE; pKJ0+mN#"  
 if(HC_ACTION==nCode) `n7*6l<k~4  
 { R8O; 8c?D  
  if((lParam&0xc0000000)==0xc0000000){// Key up ;*>Y8^K&Q  
   switch(wParam) OPOL-2<wiy  
   { j;6kN-jx  
    case VK_MENU: m<qPj"g~L  
     MaskBits&=~ALTBIT; 6yH(u}!.  
     break; 0aj4.H*%  
    case VK_CONTROL: q;a"M7  
     MaskBits&=~CTRLBIT; mucKmb/  
     break; l&#&}3M  
    case VK_SHIFT: }TE4)vXs  
     MaskBits&=~SHIFTBIT; zV {_dO  
     break; uvC ![j^~  
    default: //judge the key and send message :j feY  
     break; $fZVh%  
   } *%'nlAX6%  
   for(int index=0;index<MAX_KEY;index++){ |rW,:&;  
    if(hCallWnd[index]==NULL) 0} v_usP  
     continue; }\Kki  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j0P+<@y  
    { W C z+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); PCKgdh},  
     bProcessed=TRUE; o&WKk5$  
    } y/{&mo1\  
   } .YOC|\  
  } *O6q=yg;K:  
  else if((lParam&0xc000ffff)==1){ //Key down wP:ab  
   switch(wParam) /DLgE7iU%  
   { ROH 2KSt  
    case VK_MENU: &IYSoA"Nz  
     MaskBits|=ALTBIT; fbv%&z  
     break; q8 jI y@  
    case VK_CONTROL: >Vp #   
     MaskBits|=CTRLBIT; (.D|%P  
     break; 3pQ^vbQ"  
    case VK_SHIFT: #>)OLKP  
     MaskBits|=SHIFTBIT; ; (0<5LQ  
     break; ? }t[  
    default: //judge the key and send message _}G1/`09#  
     break; d^-sxl3}  
   } lxSCN6  
   for(int index=0;index<MAX_KEY;index++) ?-.Qv1hs6p  
   { iLhxcM2K  
    if(hCallWnd[index]==NULL) aJ;6!WFW  
     continue; { [S@+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #0*OkZMt  
    { 78o>UWA:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6,J:sm\  
     bProcessed=TRUE; DMeP9D  
    } (}^Qo^Vr  
   } h 7x_VO  
  } (bT3 r_  
  if(!bProcessed){ >S]_{pb  
   for(int index=0;index<MAX_KEY;index++){ Aw~N"i  
    if(hCallWnd[index]==NULL) >n!,KUu]  
     continue; &i/QFO7y}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1ig#|v*+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .WeP]dX%:f  
   } w26x)(7  
  } FXF#v>&  
 } E]opA$JQ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); QAI!/bB  
} YY? }/r  
`%a+LU2  
BOOL InitHotkey() Gb?O-z%8*  
{ [p 6#fG *  
 if(hHook!=NULL){ kJy bA  
  nHookCount++; ,pc\ )HR  
  return TRUE; c2$&pZ M  
 } q/|WkV `m  
 else pbM"tr_A{  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); X*cf|g  
  if(hHook!=NULL) m{ya%F  
   nHookCount++; F! |?S:X  
  return (hHook!=NULL); !Qg%d&q.Sx  
} HxVQeyOR  
BOOL UnInit() Z~Mq5#3F  
{ }UzO_&Z#6  
 if(nHookCount>1){ ,8F?v~C  
  nHookCount--; jaoGm$o>"F  
  return TRUE; _n3Jf<Y  
 } mQ9%[U,  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 6$'6x2,  
 if(unhooked==TRUE){ }/Wd9x  
  nHookCount=0; F7(~v2|  
  hHook=NULL; UeRx ^  
 } ,]N!I%SI  
 return unhooked; 4LU'E%vlC  
} Q7y6</4f  
S|A?z)I  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T#lySev  
{ y>S.B/ d  
 BOOL bAdded=FALSE; 7p?6j)rj  
 for(int index=0;index<MAX_KEY;index++){ E(T6s^8  
  if(hCallWnd[index]==0){ z]k=sk  
   hCallWnd[index]=hWnd; dt"[5;_P`  
   HotKey[index]=cKey; qj71 rj  
   HotKeyMask[index]=cMask; JH~ve  
   bAdded=TRUE; 6,'!z ?d%  
   KeyCount++; XR^VRn6O  
   break; s0Ii;7fA{  
  } i3.8m=>  
 } IbpE@C  
 return bAdded; qYFol# =%  
} LnJ/t(KV  
m_H$fioha,  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Y2Mti- \  
{ {uO8VL5+Qx  
 BOOL bRemoved=FALSE; +w/Ax[K  
 for(int index=0;index<MAX_KEY;index++){ &7 }!U  
  if(hCallWnd[index]==hWnd){ gKg2Ntxj  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ H ^Xw<Z=  
    hCallWnd[index]=NULL; *DX6m  
    HotKey[index]=0; VEd#LSh  
    HotKeyMask[index]=0; {KL<Hx2M  
    bRemoved=TRUE; v&(X& q  
    KeyCount--;   [E(DGt  
    break; +a sJV1a  
   } vi0% jsI  
  } \%NhggS*  
 } r2.87  
 return bRemoved; v,RLN`CID  
} i^uC4S~  
w2~(/RgO  
void VerifyWindow() wC BL1[~C  
{ G=3/PYp  
 for(int i=0;i<MAX_KEY;i++){ kTex>1W;  
  if(hCallWnd!=NULL){ 3WJ> T1we  
   if(!IsWindow(hCallWnd)){ eEn_aX  
    hCallWnd=NULL; R*TCoEKO  
    HotKey=0; ,I=Cl mR  
    HotKeyMask=0; hzPx8sO  
    KeyCount--; nl5K1!1  
   } 1q~U3'l:$  
  } e=Kv[R'(M  
 } ;0xCrE{l"  
} Vw9^otJu  
6kT l(+  
BOOL CHookApp::InitInstance() ^V_acAuS^  
{ z.Y7u3K.8  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); D5T\X-+]O  
 hins=AfxGetInstanceHandle(); p/lMv\`5  
 InitHotkey(); uA!T@>vl  
 return CWinApp::InitInstance(); 30>TxL=&  
} R_vZh|  
2t[c^J  
int CHookApp::ExitInstance() 4>Uo0NfL  
{ :v{ $]wg  
 VerifyWindow(); y13=y}dyDH  
 UnInit(); tO[+O=d  
 return CWinApp::ExitInstance(); .j}u'!LKul  
} t s ?b[v  
Bf'jXM{-  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file :R_{tQ-WG  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) lh#GD"^(w&  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 3Vw%[+lY9  
#if _MSC_VER > 1000 !%s7I ^f*  
#pragma once *?K` T^LS  
#endif // _MSC_VER > 1000 X2@o"xU  
)D[xY0Y~  
class CCaptureDlg : public CDialog :>3&"T.  
{ f2yv7t T   
 // Construction  v$tS 2N2  
 public: rXm!3E6JL  
  BOOL bTray; \~?s= LT  
  BOOL bRegistered; (B$FX<K3  
  BOOL RegisterHotkey(); 8OFrW.>[  
  UCHAR cKey; bR8)s{p6  
  UCHAR cMask; so8-e  
  void DeleteIcon(); GzB%vsv9 5  
  void AddIcon(); teB {GR  
  UINT nCount; X^.r@tT  
  void SaveBmp(); u-K 5  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 2(c#m*Q!b  
  // Dialog Data ~o2{Wn["  
  //{{AFX_DATA(CCaptureDlg) RsOK5XnQn  
  enum { IDD = IDD_CAPTURE_DIALOG }; kW:!$MX!  
  CComboBox m_Key; }`M6+.z3F  
  BOOL m_bControl; &qpA<F@7  
  BOOL m_bAlt; n=>Gu9`  
  BOOL m_bShift; iIF'!K=q  
  CString m_Path; A+}4 N%kh  
  CString m_Number; % (.PRRI  
  //}}AFX_DATA y(S0 2v>l  
  // ClassWizard generated virtual function overrides (\I =v".  
  //{{AFX_VIRTUAL(CCaptureDlg) U^YPL,m1  
 public: Hb$q}1+y  
  virtual BOOL PreTranslateMessage(MSG* pMsg); <5#e.w  
 protected: & vIKNGJ^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Bf}_ Jw-=  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Lg nGqIlx  
  //}}AFX_VIRTUAL A^Zs?<C-  
  // Implementation zc{C+:3$^  
 protected: $+);!?^|:  
  HICON m_hIcon; evR=Z\ _  
  // Generated message map functions l^"G\ZVI  
  //{{AFX_MSG(CCaptureDlg) S-H3UND"  
  virtual BOOL OnInitDialog(); @gj5'  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); zKutx6=aj  
  afx_msg void OnPaint(); K%k,-  
  afx_msg HCURSOR OnQueryDragIcon(); 1_QO>T'  
  virtual void OnCancel(); QezK&iJg  
  afx_msg void OnAbout(); w&gHmi  
  afx_msg void OnBrowse(); vuP1gem  
  afx_msg void OnChange(); DXGO-]!!0  
 //}}AFX_MSG A^7!+1*K+  
 DECLARE_MESSAGE_MAP() S=2,jPX2r  
}; ex1ecPpN  
#endif ;4bu=<%  
neBkwXF!  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ?xet:#R'  
#include "stdafx.h" ^n]s}t}csV  
#include "Capture.h" 9T1G/0k-  
#include "CaptureDlg.h" uprQy<I@  
#include <windowsx.h> 'n no)kQ"  
#pragma comment(lib,"hook.lib") V_pBM  
#ifdef _DEBUG . <B1i  
#define new DEBUG_NEW "mf;k^sqS  
#undef THIS_FILE +=_Pl7?  
static char THIS_FILE[] = __FILE__; ?1uAY.~ZZB  
#endif vn<S"  
#define IDM_SHELL WM_USER+1 +9X[gef8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {JgN^R<5<f  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cOQy|v`KD,  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; S(6ZX>wv:  
class CAboutDlg : public CDialog F*4+7$E0B  
{ R;o_*  
 public: {E/TC%  
  CAboutDlg(); :dzU]pk%0  
  // Dialog Data wO#+8js  
  //{{AFX_DATA(CAboutDlg) =+ p+_}C  
  enum { IDD = IDD_ABOUTBOX }; c0 |p34  
  //}}AFX_DATA q1y4B`  
  // ClassWizard generated virtual function overrides ?la_ +;m  
  //{{AFX_VIRTUAL(CAboutDlg) Q6K)EwN  
 protected: `cpcO  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support R=PzR;8  
  //}}AFX_VIRTUAL eXK`%'  
  // Implementation ~|rkt`8p  
 protected: N6;Z\\&0^q  
  //{{AFX_MSG(CAboutDlg) jvQ"cs$.  
  //}}AFX_MSG WIm7p1U#V  
  DECLARE_MESSAGE_MAP() }Kt?0  
}; TpgBS4q  
pC-OZ0  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) F6p1 VFs  
{ ~-d.3A $u  
 //{{AFX_DATA_INIT(CAboutDlg) 0K ?(xB  
 //}}AFX_DATA_INIT B! V{.p  
} }=a4uCE  
ItADO'M  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) E,7~kd~y`  
{ Tm52=+uf$  
 CDialog::DoDataExchange(pDX); @ WaYU  
 //{{AFX_DATA_MAP(CAboutDlg) Tm\[q  
 //}}AFX_DATA_MAP N_D+d4@  
} e-9unnk  
I&8m5F?$`  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) K"7;Y#1g  
 //{{AFX_MSG_MAP(CAboutDlg) *GP_ut%  
 // No message handlers Jr)`shJ"  
 //}}AFX_MSG_MAP p^P y,  
END_MESSAGE_MAP() 'hO;sL  
/T[ICd2J  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) /T)n5X  
: CDialog(CCaptureDlg::IDD, pParent) &pjV4m|j<  
{ ~qxXou,J  
 //{{AFX_DATA_INIT(CCaptureDlg) f<Tz#w&6W  
  m_bControl = FALSE; |SKG4_wGe  
  m_bAlt = FALSE; I^(#\vRW  
  m_bShift = FALSE; PMs_K"-K  
  m_Path = _T("c:\\"); <0)ud)~u  
  m_Number = _T("0 picture captured."); u3mT l  
  nCount=0; ^alZ\!B8  
  bRegistered=FALSE; n~u3  
  bTray=FALSE; m\M+pjz  
 //}}AFX_DATA_INIT Lo5@zNt%W  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ~h0BT(p/  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); L~y tAZ,  
} #Jz&9I<OKx  
M5WtGIV  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) C_cs(}wi  
{ ,G|aLBn  
 CDialog::DoDataExchange(pDX); : 5<9/  
 //{{AFX_DATA_MAP(CCaptureDlg) 1]Q 2qs  
  DDX_Control(pDX, IDC_KEY, m_Key); ^7 bf8 ^`  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); |( 9#vt#  
  DDX_Check(pDX, IDC_ALT, m_bAlt); fTV|? :C{  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); RB7AI !'a?  
  DDX_Text(pDX, IDC_PATH, m_Path); i4zV(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); |F@xwfgb  
 //}}AFX_DATA_MAP H9VXsFTW  
} Secq^#]8  
>q@Sd  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 2FIR]@MQd  
//{{AFX_MSG_MAP(CCaptureDlg) @D~+D@i$TW  
 ON_WM_SYSCOMMAND() HXfXb ^~  
 ON_WM_PAINT() Zxc7nLKF~  
 ON_WM_QUERYDRAGICON() D"XX920$~  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) !@<@QG-  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) u}}9j&^Xa  
 ON_BN_CLICKED(ID_CHANGE, OnChange) dG-or  
//}}AFX_MSG_MAP yvd `nV  
END_MESSAGE_MAP() !3I(4?G,  
3<Z'F}lg  
BOOL CCaptureDlg::OnInitDialog() -*%!q$:  
{ {(z(NgXG/  
 CDialog::OnInitDialog(); a We Bav}_  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); }\f(qw  
 ASSERT(IDM_ABOUTBOX < 0xF000); %U5P}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); @>G&7r:U  
 if (pSysMenu != NULL) wY3|#P CDV  
 { /MKNv'5&!%  
  CString strAboutMenu; ~llMrl7  
  strAboutMenu.LoadString(IDS_ABOUTBOX); O}MZ-/z=o~  
  if (!strAboutMenu.IsEmpty()) Q^lQi\[  
  { | 7 m5P@X  
   pSysMenu->AppendMenu(MF_SEPARATOR); J-tq8   
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); +[whh  
  } L$lo~7<]  
 } >v1 y0zx  
 SetIcon(m_hIcon, TRUE); // Set big icon f2 ydL/M,  
 SetIcon(m_hIcon, FALSE); // Set small icon 6Lg!L odu  
 m_Key.SetCurSel(0); \f/#<|Hm  
 RegisterHotkey(); lI4J=8O0  
 CMenu* pMenu=GetSystemMenu(FALSE); BbrT f"`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); .]j#y9>&w%  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 9fP) Fwih  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); CF|moc:;  
 return TRUE; // return TRUE unless you set the focus to a control j|[(*i%7|  
} G@!_ZM8h  
ADYx.8M|9i  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) @7@e`b?  
{ lf%b0na?r  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) z;dcAdz9  
 { jCTy:q]  
  CAboutDlg dlgAbout; IXZ(]&we  
  dlgAbout.DoModal(); bQwdgc),s{  
 } wJ+U[a  
 else m ~u|VgD  
 { 'e.q 7Jpd  
  CDialog::OnSysCommand(nID, lParam); A&<?   
 } $D QD$  
} e'1 ^+*bU  
3ppuQ Q  
void CCaptureDlg::OnPaint() ]3L@$`ys  
{ T3PX gL)o  
 if (IsIconic()) Z-(} l2\  
 { `$S^E !=  
  CPaintDC dc(this); // device context for painting NW{y% Z  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); jg[5UTkcs  
  // Center icon in client rectangle &/s~? Iq  
  int cxIcon = GetSystemMetrics(SM_CXICON); "r8EC  
  int cyIcon = GetSystemMetrics(SM_CYICON); i?F[||O"$  
  CRect rect; u4:\UC'  
  GetClientRect(&rect); >b>M Km>q  
  int x = (rect.Width() - cxIcon + 1) / 2; 7}Bj|]b)~  
  int y = (rect.Height() - cyIcon + 1) / 2; BwC<rOU  
  // Draw the icon a3Y{lc#z}  
  dc.DrawIcon(x, y, m_hIcon); RCI4~q  
 } |~SE"  
 else !:(C"}5wM  
 { Mx8Gu^FW.d  
  CDialog::OnPaint(); s=MT,  
 } T^~)jpkw  
} oEJaH  
cVp[ Z#B  
HCURSOR CCaptureDlg::OnQueryDragIcon() =HVfJ"vK  
{ 25d\!3#E  
 return (HCURSOR) m_hIcon; `gt:gx>a  
} aD2*.ln><  
5MxH)~VQoM  
void CCaptureDlg::OnCancel() j'+ELKQ  
{ }'%^jt[3  
 if(bTray) ;{k=C2  
  DeleteIcon(); O#Z/+\U  
  CDialog::OnCancel(); ;)?( 2 wP  
} ^] 6M["d/p  
B/mYoK  
void CCaptureDlg::OnAbout() id^|\hDR  
{ MM#i t=u  
 CAboutDlg dlg; ;7rd;zJ  
 dlg.DoModal(); d<x1*a  
} Z`Ax pTl  
i'HPRY  
void CCaptureDlg::OnBrowse() D*\v0=P'?  
{ }taLk@T  
 CString str; n#BvW,6J  
 BROWSEINFO bi; `FZF2.N  
 char name[MAX_PATH]; QdDObqVdy  
 ZeroMemory(&bi,sizeof(BROWSEINFO));  `?|Rc  
 bi.hwndOwner=GetSafeHwnd(); :Hk_8J  
 bi.pszDisplayName=name; x? N.WABr;  
 bi.lpszTitle="Select folder"; bKMWWJf*'  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; w9f _b3  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); GRT] aw  
 if(idl==NULL) @4drjT  
  return; T~Ly^|Ihz  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); TQf L%JT  
 str.ReleaseBuffer(); KlN/\N\  
 m_Path=str; fN)x#?  
 if(str.GetAt(str.GetLength()-1)!='\\') nIn2 *r  
  m_Path+="\\"; SO;N~D1Z6  
 UpdateData(FALSE); :"QfF@Z{  
} 7?J3ci\  
W;zpt|kAH  
void CCaptureDlg::SaveBmp() sb^mLH] 3  
{ h/2/vBs  
 CDC dc; A1),el-^5  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); -\#lF?fzb  
 CBitmap bm; #DFp[\)1  
 int Width=GetSystemMetrics(SM_CXSCREEN); Fi2xr<7"  
 int Height=GetSystemMetrics(SM_CYSCREEN); 0{+.H_f`  
 bm.CreateCompatibleBitmap(&dc,Width,Height); >2b`\Q*<  
 CDC tdc; PD6_)PXn  
 tdc.CreateCompatibleDC(&dc); j*400  
 CBitmap*pOld=tdc.SelectObject(&bm); M;jcUX_{  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Wd8R u/  
 tdc.SelectObject(pOld); SV.z>p  
 BITMAP btm; *k [J6  
 bm.GetBitmap(&btm); y$b]7O  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; r37[)kJ  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); yNCEz/4  
 BITMAPINFOHEADER bih; RWKH%C[Yd  
 bih.biBitCount=btm.bmBitsPixel; [AS}RV  
 bih.biClrImportant=0; wL}l`fRB  
 bih.biClrUsed=0; 3qaMO#{M  
 bih.biCompression=0; "Sridh?  
 bih.biHeight=btm.bmHeight; v^N`IJq  
 bih.biPlanes=1; ,Na^%A@TJ  
 bih.biSize=sizeof(BITMAPINFOHEADER); +=BAslk  
 bih.biSizeImage=size; ' cBBt  
 bih.biWidth=btm.bmWidth; mi,&0xDe a  
 bih.biXPelsPerMeter=0; Z=?aEU$7  
 bih.biYPelsPerMeter=0; >Cr\y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); J2VTo: In  
 static int filecount=0; R=]d%L8  
 CString name; t2>fmQIQ  
 name.Format("pict%04d.bmp",filecount++); y<:<$22O  
 name=m_Path+name; LP];x3  
 BITMAPFILEHEADER bfh; i-" p)2d=#  
 bfh.bfReserved1=bfh.bfReserved2=0; x/ *-P b-_  
 bfh.bfType=((WORD)('M'<< 8)|'B');  :A1:  
 bfh.bfSize=54+size; BU|#e5  
 bfh.bfOffBits=54; lpB3&H8&  
 CFile bf; @? c2)0  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ bBc[bc>R  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); NZ0O,} m  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); XH}'w9VynR  
  bf.WriteHuge(lpData,size); k8AW6oO/i  
  bf.Close(); Pe;Y1Qq>>  
  nCount++; _hu")os  
 } $za8"T*I  
 GlobalFreePtr(lpData); eWJ`$"z  
 if(nCount==1) )wvHGecp*  
  m_Number.Format("%d picture captured.",nCount); J aTp} #  
 else V[o`\|<  
  m_Number.Format("%d pictures captured.",nCount); Om;&_!i  
  UpdateData(FALSE); )3Z ^h<"j  
} ZyrI R  
4db(<h  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) @a:>$t  
{ j>-gO,v, y  
 if(pMsg -> message == WM_KEYDOWN) eqw0]U\pv  
 { +Z M)bbB  
  if(pMsg -> wParam == VK_ESCAPE) L|P5=/d  
   return TRUE; l*\y  
  if(pMsg -> wParam == VK_RETURN) uN([*'0Cg  
   return TRUE; Q/>{f0  
 } 0Z[oKXm1p  
 return CDialog::PreTranslateMessage(pMsg); Ms~{9?  
} z|EEVNFd&  
?=m?jNa;nC  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7Mb# O_eh  
{ &0 >Loja`^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ a,2'+Tlo  
  SaveBmp(); <:SZAAoIV  
  return FALSE; X/iT)R]b  
} e/0<[s*#Q  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =R*qP;#  
 CMenu pop; TT =b79k  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^6_e=jIN  
 CMenu*pMenu=pop.GetSubMenu(0); ]gYz 4OT  
 pMenu->SetDefaultItem(ID_EXITICON); d&ex5CU5  
 CPoint pt; B2-V@06  
 GetCursorPos(&pt); 28 8XF9B^  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ,AxdCT  
 if(id==ID_EXITICON) .C8PitS  
  DeleteIcon();  GB$;n?  
 else if(id==ID_EXIT)  IiY/(N+J  
  OnCancel(); D6>HN[D"  
 return FALSE; (h >-&.`&  
} UrqRx?#  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); %Ev4]}2C1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6Yx4lWBR?  
 AddIcon(); G6T_O  
 return res; -$\+' \  
} .zi_[  
{NHdyc$  
void CCaptureDlg::AddIcon() ]H`1F1=  
{ &*+'>UEe5  
 NOTIFYICONDATA data; bD/~eIcWL  
 data.cbSize=sizeof(NOTIFYICONDATA); vQ;Ex  
 CString tip; Z'"tB/=W  
 tip.LoadString(IDS_ICONTIP); 0u;4%}pD  
 data.hIcon=GetIcon(0); <StN%2WQ1  
 data.hWnd=GetSafeHwnd(); z6*X%6,8  
 strcpy(data.szTip,tip); ,6-:VIHQ  
 data.uCallbackMessage=IDM_SHELL; ;lHr =e7  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 5`~PR :dN  
 data.uID=98; '.:z&gSqx0  
 Shell_NotifyIcon(NIM_ADD,&data); 7pe\M/kl  
 ShowWindow(SW_HIDE); n*2UnKaJ  
 bTray=TRUE; Yt;MV)  
} C{U?0!^  
P)P*Xq r#:  
void CCaptureDlg::DeleteIcon() bbE!qk;hEP  
{ As'=tIro  
 NOTIFYICONDATA data; nAv#?1cjz  
 data.cbSize=sizeof(NOTIFYICONDATA); ? m DI#~)  
 data.hWnd=GetSafeHwnd(); 1q7|OWFT  
 data.uID=98; 1*\o.  
 Shell_NotifyIcon(NIM_DELETE,&data); 8WXQ Oo8  
 ShowWindow(SW_SHOW); M/b Sud?@%  
 SetForegroundWindow(); 8Vr%n2M  
 ShowWindow(SW_SHOWNORMAL); 6 (]Dh;gC  
 bTray=FALSE; \NPmym_ 6J  
} hgPa6Kd  
k>;`FFQU>  
void CCaptureDlg::OnChange() ZrpU <   
{ nT7%j{e=L  
 RegisterHotkey(); EJMM9(DQ7  
} F3On?x)  
ofm#'7P 0  
BOOL CCaptureDlg::RegisterHotkey() ~%&LTX0s|  
{ Kp%2k^U  
 UpdateData(); Lt64JH^lz  
 UCHAR mask=0; wW>A_{Y  
 UCHAR key=0; +^60T$  
 if(m_bControl) ztcp/1jIvS  
  mask|=4; +r2+X:#~T  
 if(m_bAlt) f6hnTbJ  
  mask|=2; j()7_  
 if(m_bShift) E(>=rD/+  
  mask|=1; ,Vc6Gwm  
  key=Key_Table[m_Key.GetCurSel()]; "L IF.)  
 if(bRegistered){ ,wQ5.U,  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 11 Q1AN  
  bRegistered=FALSE; C0T;![/4A  
 } "g5^_UP  
 cMask=mask; \ 2M_\Q`NY  
 cKey=key; n(1l}TJy  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); <FV1Wz  
 return bRegistered; ?gA 8x  
} }bb;~  
` Fa~  
  四、小结 b/+u4'"  
V(H1q`ao9  
  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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