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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: Uz%2{HB@{  
  Gyb|{G_  
  一、实现方法 bfI= =  
>{>X.I~  
  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: SZ~lCdWad  
; KT/;I  
#pragma data_seg("shareddata") 8LUl@!4b  
HHOOK hHook =NULL; //钩子句柄 JV?d/[u,  
UINT nHookCount =0; //挂接的程序数目 ':]Hj8t_  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 M"yOWD~s~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 o,{]<Sm  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey me$nP}%C&  
static int KeyCount =0; wxy@XN"/i+  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -Sa-eWP  
#pragma data_seg() %uvA3N>  
$f+cd8j?o  
  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。 2Q;rSe._`  
C=JS]2W2  
  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|)pZa  
^7YZ>^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR mQ2=t%  
cKey,UCHAR cMask) S{N=9934_  
{ Ey{p;;H  
 BOOL bAdded=FALSE; SNSHX2  
 for(int index=0;index<MAX_KEY;index++){ A[m<xtm5K  
  if(hCallWnd[index]==0){ co-1r/ -O  
   hCallWnd[index]=hWnd; $Ww.^ym  
   HotKey[index]=cKey; M,<UnAVP-  
   HotKeyMask[index]=cMask; aI 1tG  
   bAdded=TRUE; FmgMd)#  
   KeyCount++; fpJ%{z2  
   break; Xq}}T%jcd  
  } sK8sxy  
 } :"cKxd  
 return bAdded; 8y;gs1d;A  
} iqKs:v@+x  
//删除热键 _%(.OR  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *0'< DnGW  
{ p!K^Q3kO  
 BOOL bRemoved=FALSE; B_>r|^Vh  
 for(int index=0;index<MAX_KEY;index++){ `W.g1"o8W4  
  if(hCallWnd[index]==hWnd){ QWE\Ud.q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2?:'p[z"]  
    hCallWnd[index]=NULL; LuVL <W  
    HotKey[index]=0; "bz]5c~  
    HotKeyMask[index]=0; c-U]3`;Q  
    bRemoved=TRUE; U^]@0vR  
    KeyCount--; cUn>gT  
    break; `> +:38  
   } Q=Liy@/+!  
  } B qLL]%F  
 } 03"FK"2S  
 return bRemoved; .@$ A~/ YU  
} 6W:FT Pt44  
j1=su~  
m[Mw2F  
  DLL中的钩子函数如下: i`=%X{9  
9+ |W;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) I]BhkJ  
{ I= a?z<  
 BOOL bProcessed=FALSE; @mb'!r  
 if(HC_ACTION==nCode) t*`Sme]"B  
 { eKf5orN  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 u#NX`_  
   switch(wParam) AuZISb%6  
   {  \i\>$'f*z  
    case VK_MENU: p3e=~{v*  
     MaskBits&=~ALTBIT; ^tIYr <I  
     break; 4/OmgBo '  
    case VK_CONTROL: tlB -s;  
     MaskBits&=~CTRLBIT; )TEod!]  
     break; >E3-/)Ti  
    case VK_SHIFT: ppGWh  
     MaskBits&=~SHIFTBIT; @FF80U4'  
     break; `qRyh}Ax"  
    default: //judge the key and send message _-2n tO<E  
     break; 5&xbGEP$  
   } ZD4aT1|Q7  
   for(int index=0;index<MAX_KEY;index++){ x+b.9f4xJ  
    if(hCallWnd[index]==NULL) ~y"OyOi&  
     continue; 'S*]JZ1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Yv0y8Vz@  
    { ?Ezy0>j  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); wN^^_  
     bProcessed=TRUE; Ao#bREm  
    } { SDnVV  
   } C_yNSD  
  } oDayfyy4y)  
  else if((lParam&0xc000ffff)==1){ //有键按下 .&I!2F  
   switch(wParam) #^(Yw|/K  
   { HMDuP2Y  
    case VK_MENU: r! [Qpb-:  
     MaskBits|=ALTBIT; xzOn[.Fi  
     break; :#cJZ\YH  
    case VK_CONTROL: ~+V$0Q;L  
     MaskBits|=CTRLBIT; i:jns>E  
     break; 'H#0-V"=  
    case VK_SHIFT: R<ORw]  
     MaskBits|=SHIFTBIT; lCTXl5J5  
     break; Zr=B8wuT  
    default: //judge the key and send message ?FwHqyFVlQ  
     break; L >)|l  
   } W8r"dK  
   for(int index=0;index<MAX_KEY;index++){ bZ^'_OOn  
    if(hCallWnd[index]==NULL) Ya(3Z_f+VZ  
     continue; v6Wz:|G/u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v*c"SI=@M=  
    { lJ,\^\q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 8kvA^r`  
     bProcessed=TRUE; >V4r '9I  
    } ?*ZQ:jH  
   } I zVc  
  } #2"'tHf4  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 9+/D\|"{  
   for(int index=0;index<MAX_KEY;index++){ V]m}xZ'?^  
    if(hCallWnd[index]==NULL) s_^N=3Si   
     continue; %@|)&][hO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) kUfbB#.5L  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @Ae&1O;Zh  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 oOaLD{g>  
   } ^bfU>02Q6p  
  } 53d`+an2  
 } Cl3L)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Br.UN~q  
} V<?0(esgR  
|WSpWsr,  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: RCoDdtMo  
At !:d3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,H8M.hbsQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b80&${v  
|o*qZ}6  
  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+ W>  
dBS_N/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~*]7f%L-  
{ G9GHBwT  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) YB!f=_8  
 { W\ mgM2p  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 0)7v _|z  
  SaveBmp(); +5 gX6V\  
  return FALSE; fEiNHVx  
 } *YGj^+   
 …… //其它处理及默认处理 +$#XV@@~  
} aof'shS8  
b5I 8jPj4c  
gm =C0Sp?  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 wy{ sS}  
:ln?PT  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 w4_Xby)  
i_QiE2d  
  二、编程步骤 d$xvM  
_wX(OB  
  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"; 3<N2ehi?  
{v|ib112;  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; F!Cn'*  
7FD,TJs  
  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; m,J IId%O  
:(.:bf  
  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; 9a_UxF+6/  
_a|g >  
  5、 添加代码,编译运行程序。 /q,=!&f2  
H8B2{]HAt  
三、程序代码 ;uv$>F auk  
!VsdKG)  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL +nim47  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Xw jm T  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ V~Z)^.6  
#if _MSC_VER > 1000 XD|Xd|/ {  
#pragma once uEG4^  
#endif // _MSC_VER > 1000 5e1oxSU  
#ifndef __AFXWIN_H__ Gpcordt/  
#error include 'stdafx.h' before including this file for PCH PR x-0S  
#endif zAvI f  
#include "resource.h" // main symbols E:+r.r"Y  
class CHookApp : public CWinApp [O|c3;  
{ aY;34SF  
 public: "gzn%k[D9m  
  CHookApp(); vu}U2 0@  
  // Overrides !0UfX{.  
  // ClassWizard generated virtual function overrides 1zw,;m n  
  //{{AFX_VIRTUAL(CHookApp) tFX<"cAvK  
 public: #3eI4KJ4+l  
  virtual BOOL InitInstance(); E>gLUMG$  
  virtual int ExitInstance(); A7&/3C6{H  
  //}}AFX_VIRTUAL p! )tA  
  //{{AFX_MSG(CHookApp) "Mv^S'?>  
  // NOTE - the ClassWizard will add and remove member functions here. q[}r e2  
  // DO NOT EDIT what you see in these blocks of generated code ! 2V$Jn8v,`{  
  //}}AFX_MSG lUp%1x+  
  DECLARE_MESSAGE_MAP() vjh'<5w9Wi  
}; vpOGyvI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ^k{/Yl  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g>eWX*Pa|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i_+e&Bjd4j  
BOOL InitHotkey(); p_e x  
BOOL UnInit(); $:1/`m19  
#endif Ov4 [gHy&  
4>fj @X(3  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. g>'6"p;  
#include "stdafx.h" H 8 6 6,]  
#include "hook.h" e=IbEm{|  
#include <windowsx.h> "LW\osjen  
#ifdef _DEBUG KL9JA; "  
#define new DEBUG_NEW k.Gt }\6zP  
#undef THIS_FILE 2 n2,MB  
static char THIS_FILE[] = __FILE__; 'MB+cz+v  
#endif N~or.i&a  
#define MAX_KEY 100 odJE~\\hw  
#define CTRLBIT 0x04 H!,V7R  
#define ALTBIT 0x02 RdL5VAD  
#define SHIFTBIT 0x01 (^sb('"  
#pragma data_seg("shareddata") 4ji'6JHPg  
HHOOK hHook =NULL; xaV3N[Zd  
UINT nHookCount =0; gbh/ `  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey N1'Yo:_A  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT  xB?!nd  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey @{Fa=".Ch  
static int KeyCount =0; l&"bm C:xr  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift v&%W*M0q@  
#pragma data_seg() xdY'i0fh  
HINSTANCE hins; -;RAW1]}Y$  
void VerifyWindow(); V:+vB "  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) d{(Rs.GuP  
//{{AFX_MSG_MAP(CHookApp) ;- Vs|X  
// NOTE - the ClassWizard will add and remove mapping macros here. hp}rCy|01  
// DO NOT EDIT what you see in these blocks of generated code! {!{T,_ J  
//}}AFX_MSG_MAP /X#OX 8gb]  
END_MESSAGE_MAP() I\rjw$V#  
9ao?\]&t  
CHookApp::CHookApp() 3/& |Z<f  
{ )=aq j@v  
 // TODO: add construction code here, */TO $ ^s  
 // Place all significant initialization in InitInstance Ae2Y\sAV  
} @E h(GZN  
Q&%gpa ).W  
CHookApp theApp; zJ ;]z0O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) '-G,7!.,r%  
{ \,:7=  
 BOOL bProcessed=FALSE; wLt0Fq6QG  
 if(HC_ACTION==nCode) Gz8JOl  
 { LUz`P6  
  if((lParam&0xc0000000)==0xc0000000){// Key up y^kC2DS   
   switch(wParam) a{%EHL,F  
   { U~c9PqjZ  
    case VK_MENU: R iV]SgV 9  
     MaskBits&=~ALTBIT; _+}hId  
     break; YhAO  
    case VK_CONTROL: rEU1 VvE  
     MaskBits&=~CTRLBIT; ;;U&mhz`  
     break; ZX{eggXl  
    case VK_SHIFT:  P/]8+_K  
     MaskBits&=~SHIFTBIT; BCd0X. m(  
     break; V2tA!II-s  
    default: //judge the key and send message p!?7;  
     break; oW(8bd)  
   } q?L*Luu+  
   for(int index=0;index<MAX_KEY;index++){  wJvk  
    if(hCallWnd[index]==NULL) G`;mSq6i  
     continue; F%{z E ANm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U^-J_ yq  
    { wjOqCF"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;[Eso p  
     bProcessed=TRUE; qzo)\,  
    } `<Hc,D; p  
   } #SD2b,f  
  } HDu|KW$o1  
  else if((lParam&0xc000ffff)==1){ //Key down )coA30YR  
   switch(wParam) Th~pju  
   { (ueH@A"9;  
    case VK_MENU: }JT&lyO< b  
     MaskBits|=ALTBIT; pBQ[lPCY/  
     break; F1`mq2^@  
    case VK_CONTROL: X&K,,C  
     MaskBits|=CTRLBIT; +ZBj_Vw*|  
     break; R~N%sn  
    case VK_SHIFT: *y>|  
     MaskBits|=SHIFTBIT; F{}:e QD  
     break; xelh!AtE  
    default: //judge the key and send message 7FP"]\x  
     break; g)MLgjj  
   } )*o) iN 7l  
   for(int index=0;index<MAX_KEY;index++) W`n_m&Y\  
   { .=c@ps  
    if(hCallWnd[index]==NULL) ^4saB+qm  
     continue; ZQ[s:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xrJ0  
    { ~<osL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]7h;MR  
     bProcessed=TRUE; xz,M>Ua  
    } dsb z\w3:  
   } a<V Mh79*  
  } 52.hJNq#L  
  if(!bProcessed){ VrFI5_M/  
   for(int index=0;index<MAX_KEY;index++){ o%Qn%gaX  
    if(hCallWnd[index]==NULL) q#Ik3 5  
     continue; Yc(lY N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _ `7[}M~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Pp|pH|(n ,  
   } fK=vLcH  
  } wp-3U}P2(  
 } 23q2u6.F`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3v<9 Z9O  
} _'s5FlZq  
\z2d=E  
BOOL InitHotkey() u)ZZ/|  
{ ['0^gN$:e  
 if(hHook!=NULL){ IRI<no  
  nHookCount++; c;R .rV<  
  return TRUE; 8EI&}I  
 } Z,b^f Vw  
 else a &R,jq  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 1+Y; "tT  
  if(hHook!=NULL) .fY$$aD$4  
   nHookCount++; s|"4!{It  
  return (hHook!=NULL); $I /RN  
} )/tdiRpn  
BOOL UnInit() yXc@i)9w3  
{ Ob -k`@_|  
 if(nHookCount>1){ )v.\4Q4  
  nHookCount--; +Nka,C^O"  
  return TRUE; ;!>>C0s"  
 } /3~}= b  
 BOOL unhooked = UnhookWindowsHookEx(hHook); sZU Ao&  
 if(unhooked==TRUE){ tLx8}@X"  
  nHookCount=0; h6(L22Hn  
  hHook=NULL; .O.fD  
 } QOF'SEq"k  
 return unhooked; E __A1j*gd  
} vYG$>*  
Aj=c,]2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t]pJt  
{ oga0h'  
 BOOL bAdded=FALSE; 5wMEp" YHE  
 for(int index=0;index<MAX_KEY;index++){ faI4`.i  
  if(hCallWnd[index]==0){ w~*"mZaG  
   hCallWnd[index]=hWnd; TUVqQ\oF:  
   HotKey[index]=cKey; s-xby~  
   HotKeyMask[index]=cMask; VnMiZAHR  
   bAdded=TRUE; T}A{Xu*:+H  
   KeyCount++; OB ~74}3;  
   break; Ga^k1TQq  
  } , Onu%  
 } F ?TmOa0  
 return bAdded; 6~q"#94  
} H\e<fi%Q  
HLM"dmI   
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) = G3A}  
{ y|Zj M  
 BOOL bRemoved=FALSE; 2c<phmiK  
 for(int index=0;index<MAX_KEY;index++){ *r]#jY4qx  
  if(hCallWnd[index]==hWnd){ ~wRozV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Z7R+'OC  
    hCallWnd[index]=NULL; 4'# _b  
    HotKey[index]=0; OKzk\F6  
    HotKeyMask[index]=0; MMUw+jM4  
    bRemoved=TRUE; #Y<b'7yJ  
    KeyCount--; b ~FmX  
    break; aD3Q-a[  
   } 5($ '@u  
  } N DV_/BI  
 } SYTzJK@vZJ  
 return bRemoved; rW3fd.;kss  
}  /=7[Q  
^zaN?0%S33  
void VerifyWindow() @;z}Hk0A  
{ 'GcZxF0  
 for(int i=0;i<MAX_KEY;i++){ aG\B?pn-  
  if(hCallWnd!=NULL){ 6e;.}i  
   if(!IsWindow(hCallWnd)){ \<A@Nf"  
    hCallWnd=NULL; tI(co5 W  
    HotKey=0; .{W)E  
    HotKeyMask=0; sWnU*Q  
    KeyCount--; YEqWTB|w  
   } Bhrp"l +|  
  } OC[(Eq  
 } 2]*2b{gF,  
} ffYiu4$m  
Au/n|15->C  
BOOL CHookApp::InitInstance() 1%6}m`3  
{ VN8ao0^d;d  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); sxLq'3(  
 hins=AfxGetInstanceHandle(); !P0Oq)q  
 InitHotkey(); ?wx|n_3<:  
 return CWinApp::InitInstance(); }mC-SC)oSi  
} AHR%3W  
`p%&c%*A  
int CHookApp::ExitInstance() $Mp#tH28  
{ 4m6E~_:F  
 VerifyWindow(); F 'U G p  
 UnInit(); @YTZnGG*  
 return CWinApp::ExitInstance(); vQ}llA h  
} w#,C{6  
rB:W\5~7  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file fhmq O0  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) fm\IQqIK%  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ pJ5Sxgv{;  
#if _MSC_VER > 1000 DFt1{qS8@u  
#pragma once K(HP PM\  
#endif // _MSC_VER > 1000 ,tL<?6_  
L[*Xrp;/&  
class CCaptureDlg : public CDialog o3l_&?^  
{ Xu:S h<:R  
 // Construction MLcc   
 public: 3l 0>  
  BOOL bTray; $9\!CPZ2  
  BOOL bRegistered; ;HJ|)PN5L  
  BOOL RegisterHotkey(); @vaK-&|#$  
  UCHAR cKey; Vj"B#  
  UCHAR cMask; 2@aVoqrq#  
  void DeleteIcon(); Bn/ {J  
  void AddIcon(); GKwm %A  
  UINT nCount; PDo%ob\Ym  
  void SaveBmp(); eVDI7W:(Sn  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor o84!$2P+w  
  // Dialog Data ;p#)z/zZ  
  //{{AFX_DATA(CCaptureDlg) MI@id  
  enum { IDD = IDD_CAPTURE_DIALOG }; ?j8F5(HF?  
  CComboBox m_Key; B@l/'$G  
  BOOL m_bControl; ;%AK< RT  
  BOOL m_bAlt; a<M<) {$u  
  BOOL m_bShift; ^60BQ{ne  
  CString m_Path; iFW)}_.  
  CString m_Number; Q': }'CI  
  //}}AFX_DATA Xb=9~7&,$  
  // ClassWizard generated virtual function overrides o+(.Pb  
  //{{AFX_VIRTUAL(CCaptureDlg) B&yb%`9],W  
 public: ;X! sTs  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ]-& ehW  
 protected: $aX}i4F  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support BXVmt!S5F  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); D`LcL|nmH  
  //}}AFX_VIRTUAL ,.uPlnB_  
  // Implementation CC>]Gc7  
 protected: 5TVDt  
  HICON m_hIcon; C-$S]6  
  // Generated message map functions 1 {dhGX  
  //{{AFX_MSG(CCaptureDlg) n=n!Hn  
  virtual BOOL OnInitDialog(); EOjo>w>  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); k9.2*+vvg  
  afx_msg void OnPaint(); |jniI(  
  afx_msg HCURSOR OnQueryDragIcon(); ZUb6d*B  
  virtual void OnCancel(); \&J7>vu^y  
  afx_msg void OnAbout(); s3W)hU)  
  afx_msg void OnBrowse(); x(7K=K']  
  afx_msg void OnChange(); m6)8L?B   
 //}}AFX_MSG 9Bl_t}0  
 DECLARE_MESSAGE_MAP() Im1e/F]  
}; [MYd15  
#endif eW]K~SPd7  
h \b]>q@  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file B]q &?~  
#include "stdafx.h" ~&=-*  
#include "Capture.h" }N1Z7G  
#include "CaptureDlg.h" jx&pRjP  
#include <windowsx.h> #z)@T  
#pragma comment(lib,"hook.lib") UfSWdR)  
#ifdef _DEBUG j9sf~}D>  
#define new DEBUG_NEW [: X  
#undef THIS_FILE *BT-@V.4  
static char THIS_FILE[] = __FILE__; =usx' #rb  
#endif r"SuE:D  
#define IDM_SHELL WM_USER+1 yK<%AV@v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;Id%{1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6)kF!/J  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; b/ h,qv  
class CAboutDlg : public CDialog oBQr6-nZ  
{ 4,T!zT6&  
 public: E@aR5S>  
  CAboutDlg(); %zyO}  
  // Dialog Data _* ]~MQ=  
  //{{AFX_DATA(CAboutDlg) n3-u.Fb  
  enum { IDD = IDD_ABOUTBOX }; PBb@J'b  
  //}}AFX_DATA >n)N=Zyu  
  // ClassWizard generated virtual function overrides V4}9f5FR  
  //{{AFX_VIRTUAL(CAboutDlg) RX%*:lXi_  
 protected: G:$wdT(u  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Iu^# +n  
  //}}AFX_VIRTUAL k`6T% [D]  
  // Implementation Zg%U4m:  
 protected: l~wx8 ,?G  
  //{{AFX_MSG(CAboutDlg) ~oh=QakW  
  //}}AFX_MSG -@-cG\{  
  DECLARE_MESSAGE_MAP() .xuLvNyQr  
}; $$2\qN -  
Zi[@xG8dm  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) =9GL;z:R+  
{ 0Np }O=>  
 //{{AFX_DATA_INIT(CAboutDlg) 9`+c<j4/B  
 //}}AFX_DATA_INIT Uwr inkoeE  
} I|,^a|\  
2GA6@-u\  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) V=BF"S;-'  
{ ~S15tZ $  
 CDialog::DoDataExchange(pDX); .HF+JHIUu  
 //{{AFX_DATA_MAP(CAboutDlg) f*7/O |Gp  
 //}}AFX_DATA_MAP r}MXXn,f  
} |AW[4Yn>  
0~Ot  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) [s"3g\L';  
 //{{AFX_MSG_MAP(CAboutDlg) .{LFc|Z[  
 // No message handlers yv^j~  
 //}}AFX_MSG_MAP &xMR{:  
END_MESSAGE_MAP() ={-\)j  
0F6^[osqtl  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) h #Od tc1)  
: CDialog(CCaptureDlg::IDD, pParent) y.26:c(  
{ =O1N*'e  
 //{{AFX_DATA_INIT(CCaptureDlg) ngj=w;7~+  
  m_bControl = FALSE; I4ZL +a  
  m_bAlt = FALSE; N\1!)b  
  m_bShift = FALSE; &/}]9 #  
  m_Path = _T("c:\\"); Xy:'f".M~\  
  m_Number = _T("0 picture captured."); y!;rY1  
  nCount=0; h S}?"ST|  
  bRegistered=FALSE; [WnX'R R  
  bTray=FALSE; }:7'C. ."  
 //}}AFX_DATA_INIT aErms-~  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 *g]q~\b/;  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); z;@;jQ7  
}  pI|Lt  
uuHR!  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) X90VJb]  
{ )uiYu3 I  
 CDialog::DoDataExchange(pDX); Lnbbv  *  
 //{{AFX_DATA_MAP(CCaptureDlg) fDhV *LqW  
  DDX_Control(pDX, IDC_KEY, m_Key); U0q{8 "Pl  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); %+YLe-\?  
  DDX_Check(pDX, IDC_ALT, m_bAlt); \R yOexNZ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); FA<|V!a  
  DDX_Text(pDX, IDC_PATH, m_Path); R<@s]xX_  
  DDX_Text(pDX, IDC_NUMBER, m_Number); M5s>;q)  
 //}}AFX_DATA_MAP j|TcmZGO  
} N}b/; Y  
kB {  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) o8.KakrPP  
//{{AFX_MSG_MAP(CCaptureDlg) (wU<Kpt?J  
 ON_WM_SYSCOMMAND() <61T)7  
 ON_WM_PAINT() AHc:6v^  
 ON_WM_QUERYDRAGICON() :oY u+ cQ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) i-w^pv'  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) aa2&yc29hp  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 0m7ANqE[Z  
//}}AFX_MSG_MAP 9{@[ l!]W  
END_MESSAGE_MAP() m.e+S,i  
]l7) F-v  
BOOL CCaptureDlg::OnInitDialog() kg?[   
{ R7}=k)U?d@  
 CDialog::OnInitDialog(); e3,TY.,Ay  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); -U~]Bugvh  
 ASSERT(IDM_ABOUTBOX < 0xF000); bhDV U(%I6  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ma[%,u`  
 if (pSysMenu != NULL) O*xC}$OOn  
 { u9My.u@-*%  
  CString strAboutMenu; A(G%9'T  
  strAboutMenu.LoadString(IDS_ABOUTBOX); h3D~?Iom  
  if (!strAboutMenu.IsEmpty()) 8TGO6oY+=  
  { V TQ V]>|  
   pSysMenu->AppendMenu(MF_SEPARATOR); A5cx!h  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); NFw7g&1;Kp  
  } m/RX~,T*v&  
 } 9W88_rE'e}  
 SetIcon(m_hIcon, TRUE); // Set big icon ".A+'pJ  
 SetIcon(m_hIcon, FALSE); // Set small icon yoiKt; S  
 m_Key.SetCurSel(0); 0YK`wuZGS  
 RegisterHotkey(); =NLsT.aa  
 CMenu* pMenu=GetSystemMenu(FALSE); gcDo o2RE  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ms2y[b  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); XG FjqZr`  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); oU`8\ n](  
 return TRUE; // return TRUE unless you set the focus to a control <"F\&M`G  
} @zo}#.g  
wZB:7E%  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 2(M^8Bl  
{ S`g:z b_  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) "&;8U.  
 { n "?It  
  CAboutDlg dlgAbout; FeOo;|a  
  dlgAbout.DoModal(); ,PC'xrEo  
 } XCr\Y`,Z@  
 else gv)F`uRWA  
 { 4Gz5Ju  
  CDialog::OnSysCommand(nID, lParam); yN}upYxp  
 } FN jT?*  
} Cq\1t  
C_xO k'091  
void CCaptureDlg::OnPaint() WeyH;P=  
{ ; ^+#  
 if (IsIconic()) 8>^(-ca_  
 { C><]o  
  CPaintDC dc(this); // device context for painting .,Q j3  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); k |}&  
  // Center icon in client rectangle x?s5vxAKf  
  int cxIcon = GetSystemMetrics(SM_CXICON); xuBXOr4"P  
  int cyIcon = GetSystemMetrics(SM_CYICON); 5@l[!Jl0k  
  CRect rect; XRoMD6qf;  
  GetClientRect(&rect); GVS-_KP\  
  int x = (rect.Width() - cxIcon + 1) / 2; ZccQ{$0H  
  int y = (rect.Height() - cyIcon + 1) / 2; XfY~q~f8  
  // Draw the icon EC9D.afy&  
  dc.DrawIcon(x, y, m_hIcon); u\LG_/UJV1  
 } :sO^b*e /  
 else ;VM',40  
 { VG FWF3s  
  CDialog::OnPaint(); 8/q6vk><  
 } j7r!N^  
} $p_FrN{  
[4qCW{x._  
HCURSOR CCaptureDlg::OnQueryDragIcon() ) D_ZZPq_  
{ 1$S;#9PQ  
 return (HCURSOR) m_hIcon; WOqAVd\  
} WZ}je!82  
HqM>K*XKU  
void CCaptureDlg::OnCancel() ~yacJU=  
{ :(IP rQ  
 if(bTray) BC!n;IAe  
  DeleteIcon(); MV8Lk/zd?A  
  CDialog::OnCancel(); WH:[Y7D  
} (EZ34,k'S  
?naPti1GX  
void CCaptureDlg::OnAbout() p#-ov-znp  
{ 5vxKkk&i4l  
 CAboutDlg dlg; !%w#h0(b  
 dlg.DoModal(); \1` L-lz  
} <(|No3jx  
}m '= _u  
void CCaptureDlg::OnBrowse() oh%kuO T[  
{ $E=t6WvA  
 CString str; P "S=RX#+  
 BROWSEINFO bi; >)5=6{x  
 char name[MAX_PATH]; 2 uuI_9 "^  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); >y P`8Oq[  
 bi.hwndOwner=GetSafeHwnd(); 2kv%k3 Q{  
 bi.pszDisplayName=name; .-kqt^Gc  
 bi.lpszTitle="Select folder"; PqOy"HO  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; -Vj'QqZ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9a.r(W[9  
 if(idl==NULL) NpmPm1Ix .  
  return; Znl&.,c)  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); X`,4pSQ;  
 str.ReleaseBuffer(); 1\v$8pP+  
 m_Path=str; Y>OL2g  
 if(str.GetAt(str.GetLength()-1)!='\\') C):RE<X  
  m_Path+="\\"; B_f0-nKP  
 UpdateData(FALSE); m>po+7"b  
} 9ICC2%j|  
fX.V+.rj  
void CCaptureDlg::SaveBmp() ]>utLi5dX  
{ ZqI.n4:9  
 CDC dc; x.>E7 +  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); >{DHW1kF?  
 CBitmap bm; fVR:m`'Iq_  
 int Width=GetSystemMetrics(SM_CXSCREEN); c[=%v]j:u  
 int Height=GetSystemMetrics(SM_CYSCREEN); .aRL'1xHl  
 bm.CreateCompatibleBitmap(&dc,Width,Height); U3ygFW%  
 CDC tdc; 3J\NkaSR  
 tdc.CreateCompatibleDC(&dc); ^RN1?dXA  
 CBitmap*pOld=tdc.SelectObject(&bm); DNgQ.lV  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); xx}R6VKU.  
 tdc.SelectObject(pOld); " mKMym2  
 BITMAP btm; >M` swEj  
 bm.GetBitmap(&btm); Kd_WN;l  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; )G(6=l*  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ^V^In-[!y:  
 BITMAPINFOHEADER bih; =hV-E D  
 bih.biBitCount=btm.bmBitsPixel; V/j]UK0$  
 bih.biClrImportant=0; Q]*YIb~D  
 bih.biClrUsed=0; C,C=W]G  
 bih.biCompression=0; DdI7%?hK  
 bih.biHeight=btm.bmHeight; !'14mN#A  
 bih.biPlanes=1; V/5hEoDt  
 bih.biSize=sizeof(BITMAPINFOHEADER); nG#lrYZw  
 bih.biSizeImage=size; ?e |'I"  
 bih.biWidth=btm.bmWidth; {HqwpB\@  
 bih.biXPelsPerMeter=0; my#qmI  
 bih.biYPelsPerMeter=0; Isq3YY  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); CK e  
 static int filecount=0; ]{9oB-;,  
 CString name; `Tzq vnn  
 name.Format("pict%04d.bmp",filecount++); 5H6GZ:hp  
 name=m_Path+name; l3aG#4jj  
 BITMAPFILEHEADER bfh; [7Nn%eZC  
 bfh.bfReserved1=bfh.bfReserved2=0; W7N Hr5RC  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 7YRDQjg  
 bfh.bfSize=54+size; =q|fe%#  
 bfh.bfOffBits=54; lwH&4K  
 CFile bf; Q^Ln`zMe  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?`F")y  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 6'C!Au  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ";~}"Yz?[  
  bf.WriteHuge(lpData,size); ]\nG1+ta  
  bf.Close(); K{VF_S:  
  nCount++; BfOG e!Si  
 }  =erA.u  
 GlobalFreePtr(lpData); Vvx(7p-GQ  
 if(nCount==1) )Jx!VJ^Y  
  m_Number.Format("%d picture captured.",nCount); @ ADY?  
 else u)P$xkf  
  m_Number.Format("%d pictures captured.",nCount); 3&*0n^g  
  UpdateData(FALSE); rL URP2~  
} y? [*qnPj  
T[)) ful  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 0:G@a&Lr  
{ 1at$_\{.(  
 if(pMsg -> message == WM_KEYDOWN) Fm}O,=  
 { tYfhKJzGC  
  if(pMsg -> wParam == VK_ESCAPE) k?Jzy  
   return TRUE; hvBuQuk)  
  if(pMsg -> wParam == VK_RETURN) -b@E@uAX /  
   return TRUE; SX}GKu  
 } AW'tZF"  
 return CDialog::PreTranslateMessage(pMsg); =nnS X-x  
} yh_s(>sh  
I#l9  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8O{]ML  
{ :0T]p"y4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?HIc=  
  SaveBmp(); `n-e.{O((  
  return FALSE; u2<:mu[|P  
} 9[N' HpQ3  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ nVG\*#*]|  
 CMenu pop; KHr8\qLH  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Ao96[2U6  
 CMenu*pMenu=pop.GetSubMenu(0); v85&s  
 pMenu->SetDefaultItem(ID_EXITICON); z!Kadqns  
 CPoint pt; ?p5RSt  
 GetCursorPos(&pt); v03~=(  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 9+QLcb  
 if(id==ID_EXITICON) C>68$wd>  
  DeleteIcon(); !xo@i XL  
 else if(id==ID_EXIT) tzpGKhrk6  
  OnCancel(); C`mXEX5  
 return FALSE; 8Z3+S)6  
} >mF`XbS  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ">fgoDQ  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) (%0X\zvu/  
 AddIcon(); hQGZrZK#  
 return res;  NkO$ M  
} LR)is  
/LSiDys  
void CCaptureDlg::AddIcon() *C\4%l   
{ zm8m J2s  
 NOTIFYICONDATA data; [F/xU  
 data.cbSize=sizeof(NOTIFYICONDATA); 3C,e>zE}  
 CString tip; 0[3b,  
 tip.LoadString(IDS_ICONTIP); O1#rCFC|y  
 data.hIcon=GetIcon(0); 7DYD+N+T  
 data.hWnd=GetSafeHwnd(); C)C;U&Qd  
 strcpy(data.szTip,tip); mOXI"q]p  
 data.uCallbackMessage=IDM_SHELL; bfpW ^y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ] lO$oO  
 data.uID=98; S'@"a%EV  
 Shell_NotifyIcon(NIM_ADD,&data);  %ANPv=  
 ShowWindow(SW_HIDE); +$ -#V   
 bTray=TRUE; y mE`V  
} Mvcl9  
U_8I$v-~  
void CCaptureDlg::DeleteIcon() S i>TG  
{ 3o^V$N.  
 NOTIFYICONDATA data; 33;|52$  
 data.cbSize=sizeof(NOTIFYICONDATA); |y=gp  
 data.hWnd=GetSafeHwnd(); 11-uJVO~*  
 data.uID=98; h">X!I  
 Shell_NotifyIcon(NIM_DELETE,&data); T]zjJwa  
 ShowWindow(SW_SHOW); O~Fk0}-  
 SetForegroundWindow(); 3}gK`1Nq1  
 ShowWindow(SW_SHOWNORMAL); '#Fh J%x  
 bTray=FALSE; CKR9APkv  
} Q?;ntzi  
~ dk1fh  
void CCaptureDlg::OnChange() X'F$K!o*,:  
{ Qv=Z  
 RegisterHotkey(); *Xnq1_K}  
} r 1a{Y8?  
DtS{iH=s]  
BOOL CCaptureDlg::RegisterHotkey() 1e+?O7/  
{ _ o(h]G1].  
 UpdateData(); a[!d)Y:zx  
 UCHAR mask=0; ;7A,'y4f  
 UCHAR key=0;  "O 'I  
 if(m_bControl) ;C<A }  
  mask|=4; n)H0;25L  
 if(m_bAlt) ;(,Fe/wvC  
  mask|=2; a RwBxf  
 if(m_bShift) 'ng/A4  
  mask|=1; vJ' 93 h  
  key=Key_Table[m_Key.GetCurSel()]; LYF vzw>M  
 if(bRegistered){ -XyuA:pxx  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); H}~^,B2;  
  bRegistered=FALSE; CUG<v3\  
 } tSYnc7  
 cMask=mask; ]mh+4k?b  
 cKey=key; ]>,|v,i =  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ]z%9Q8q'  
 return bRegistered; 1mV0AE538  
} 6;*(6$;  
TExlGAHo+O  
  四、小结 2fk   
T{M:)}V  
  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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