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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: bR)(H%I  
  a8UwhjFO  
  一、实现方法 )<tI!I][j  
S@/IQR  
  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: ;4pYK@9w_  
q0zr E5  
#pragma data_seg("shareddata") sjV!5Z  
HHOOK hHook =NULL; //钩子句柄 \vO,E e~#W  
UINT nHookCount =0; //挂接的程序数目 uu>Pkfo  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 @8I4[TE  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ;N?]eM}yf  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey p|p l  
static int KeyCount =0; ^\S~?0^m  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Ug<#en  
#pragma data_seg() qO|R^De  
m*kl  
  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。 1bn^.768l  
736Jq^T  
  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: k5kxQhPf  
m+T;O/lG0{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR e-EUf  
cKey,UCHAR cMask) D1=((`v '  
{ mUik A9u5=  
 BOOL bAdded=FALSE; "L&#lfOKG  
 for(int index=0;index<MAX_KEY;index++){ /PSd9N*=y  
  if(hCallWnd[index]==0){ }|8_9Rx0*  
   hCallWnd[index]=hWnd; I<6P;  
   HotKey[index]=cKey; ~G6Ox)/  
   HotKeyMask[index]=cMask; Vo'T!e- B  
   bAdded=TRUE; 2|*JSU.I  
   KeyCount++; z\%67C  
   break; 1 P!Yxeh  
  } Yz +ZY  
 } rr02pM0  
 return bAdded; M,\:<kNI  
} b?lD(fa&  
//删除热键 =h5H~G5AT  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]z/8KL  
{ oV|4V:G q  
 BOOL bRemoved=FALSE; \6Zr  
 for(int index=0;index<MAX_KEY;index++){ [rV>57`YD  
  if(hCallWnd[index]==hWnd){ 4p,EBn9(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ '|8} z4/g  
    hCallWnd[index]=NULL; GE%Z9#E  
    HotKey[index]=0; P 'od`  
    HotKeyMask[index]=0; hFy;ffs.  
    bRemoved=TRUE; DrY:9[LP  
    KeyCount--; ]Hefm?9*^  
    break; j~jV'f.:H  
   } ?WqT[MnK  
  } /n{omx  
 } A#J`;5!Sc  
 return bRemoved; lHPd"3HDK  
} f\sQO&  
]\hSI){  
NRIG1v>  
  DLL中的钩子函数如下: 9CWezI+  
)9"_J9G  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) r\-uJ~8N  
{ b((M)Gz  
 BOOL bProcessed=FALSE; {CGUL|y  
 if(HC_ACTION==nCode) _C*fs< #  
 { @] DVD  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 }o?APvd  
   switch(wParam) q(.sq12<<W  
   {  eoG$.M"  
    case VK_MENU: I%j|D#qY:T  
     MaskBits&=~ALTBIT; PIoLywpRn  
     break; 87 $dBb{  
    case VK_CONTROL: .yqM7U_  
     MaskBits&=~CTRLBIT; &;[Io  
     break; gv- xm  
    case VK_SHIFT: %4,O 2\0?&  
     MaskBits&=~SHIFTBIT; pm 9"4z  
     break; YA_c N5p/@  
    default: //judge the key and send message IID-k  
     break; v,-HU&/*B  
   } CR"|^{G  
   for(int index=0;index<MAX_KEY;index++){ d\|?-hY`[  
    if(hCallWnd[index]==NULL) JP!~,mdS  
     continue; UU;(rS/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J\:R|KaP<p  
    { 7WkB>cn  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); V k  K  
     bProcessed=TRUE; 8"2=U6*C  
    } Mb|a+,:>3  
   } :toh0oB[  
  } K}buH\yco  
  else if((lParam&0xc000ffff)==1){ //有键按下 T?tgd J  
   switch(wParam) yW1)vD7  
   { 7XTkX"zKj  
    case VK_MENU: 8hOk{xs8  
     MaskBits|=ALTBIT; t(NI-UXBp  
     break; g(qJN<R C/  
    case VK_CONTROL: jHE}qE~>5  
     MaskBits|=CTRLBIT; S >X:ZYYC  
     break; M3c$=>  
    case VK_SHIFT: e.7EU  
     MaskBits|=SHIFTBIT; IEsEdw]aZE  
     break; M/>7pZW  
    default: //judge the key and send message hKLCJ#T  
     break; |,gc_G  
   } 2Mc3|T4)U  
   for(int index=0;index<MAX_KEY;index++){ ODNM+#}`  
    if(hCallWnd[index]==NULL) nYR#  
     continue; Wz49i9e+d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [q) 8N  
    { Ln')QN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); t{^*6XOcJ  
     bProcessed=TRUE; Z'`g J&6n  
    } Xqg@ e:g  
   } Ce9|=Jx!  
  } "GMBjT8  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 P;=n9hgHI  
   for(int index=0;index<MAX_KEY;index++){ f332J  
    if(hCallWnd[index]==NULL) SPX$ U5&  
     continue; Z_};|B}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =9O^p@Q#W  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); WM7oM~&{6  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 4B =7:r  
   } nm5cpnNl  
  } *4Thd:7 `  
 } =n5zM._S-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %GjM(;Tk  
} p{amC ;cI$  
=9'RM>  
  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: 8uc1iB  
+Mo9kC  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ov ` h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p Dx1z|@z  
&=Ar  
  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 oD`=I*<  
"CSsCA$/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) n7B7m,@1  
{ $2oTkOA   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Zd^rNHhA  
 { ,&]S(|2%>t  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 3 }TaF~  
  SaveBmp(); y I HXg#  
  return FALSE; AK,J7  
 } Su 586;\  
 …… //其它处理及默认处理 #I{h\x><?  
} PWaw]*dFmy  
A-H&  
.b3Qfxc>  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 nrL9 E'F'  
/\ y?Y  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 W98i[Q9A7  
?i7%x,g(Z  
  二、编程步骤 cv-PRH#  
?]|\4]zV  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; / ;$#d}R  
yzbx .  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; CJ/X}hi,  
*W4m3Lq  
  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; 9_# >aOqL  
7`- Zuf  
  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; 3c#BKHNC  
%+ @O#P  
  5、 添加代码,编译运行程序。 @K\~O__  
q}`${3qQ3  
三、程序代码 D"Bl:W'?j  
/7a BDc-v  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL yh Yb'GK  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) s>B5l2Q4  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ j`JMeCG=Ee  
#if _MSC_VER > 1000 )IP,;<  
#pragma once iZ#!O* >  
#endif // _MSC_VER > 1000 ]{)a,c NG  
#ifndef __AFXWIN_H__ 4,bv)Im+ `  
#error include 'stdafx.h' before including this file for PCH Ttu2skcv  
#endif sv: 9clJ  
#include "resource.h" // main symbols nno}e/zqf  
class CHookApp : public CWinApp hv`~?n)D66  
{ &vo--V1|  
 public: 9v;Vv0k_  
  CHookApp(); u!!Y=!y*<  
  // Overrides H{@Yo\J  
  // ClassWizard generated virtual function overrides #o=y?(  
  //{{AFX_VIRTUAL(CHookApp) j#X.KM   
 public: s [M?as  
  virtual BOOL InitInstance(); kW2sY^Rg  
  virtual int ExitInstance(); N+m)/x =:  
  //}}AFX_VIRTUAL nGpXI\K  
  //{{AFX_MSG(CHookApp) 3C?f(J}  
  // NOTE - the ClassWizard will add and remove member functions here. xHUsFm s  
  // DO NOT EDIT what you see in these blocks of generated code ! Fu SL}P  
  //}}AFX_MSG ZOft.P O  
  DECLARE_MESSAGE_MAP() In:9\7~jC  
}; $h2){*5E{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); mPOGidxix  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K$&s=Hm  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~xA-V4.  
BOOL InitHotkey(); o9|nJ;  
BOOL UnInit(); wF IegC(  
#endif q$ZHd  
S'|,oUWDb  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ?zeJ#i  
#include "stdafx.h" ujDd1Bxf?  
#include "hook.h" C\S3Gs  
#include <windowsx.h> _K`wG}YIE  
#ifdef _DEBUG $*SW8'],`  
#define new DEBUG_NEW AJf4_+He  
#undef THIS_FILE whmdcVh.  
static char THIS_FILE[] = __FILE__; Vr)<\h  
#endif 4~k\j  
#define MAX_KEY 100 6DM$g=/ '  
#define CTRLBIT 0x04 931bA&SL=/  
#define ALTBIT 0x02 aH 4c02s$  
#define SHIFTBIT 0x01 E[2m&3&  
#pragma data_seg("shareddata") 33o9Yg|J~  
HHOOK hHook =NULL; V^7V[(~`  
UINT nHookCount =0; X>d"]GD  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Q;[,Q~c[u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 1e(E:_t  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 1 9&<|qTz  
static int KeyCount =0; 1%EBd%`#  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift #D<C )Q  
#pragma data_seg() bP8Sj16q  
HINSTANCE hins; nc~F_i=  
void VerifyWindow(); s:OFVlC%\  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 1/RsptN"v  
//{{AFX_MSG_MAP(CHookApp) 5A%w 8Qv  
// NOTE - the ClassWizard will add and remove mapping macros here. b1^vd@(lx  
// DO NOT EDIT what you see in these blocks of generated code! Ozw;(fDaU  
//}}AFX_MSG_MAP t`WB;o!  
END_MESSAGE_MAP() NhfJ30~  
||T2~Q*:y  
CHookApp::CHookApp() 8 BY j  
{ lphFhxJA{  
 // TODO: add construction code here, O}tZ - 'T  
 // Place all significant initialization in InitInstance 4zASMu  
} 2>|dF~"  
L; T8?+x  
CHookApp theApp; D!Q">6_"z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;o^eC!:/%  
{ }E+!91't.^  
 BOOL bProcessed=FALSE; ;,$NAejgd  
 if(HC_ACTION==nCode) O!zV)^r  
 { B\<Q ;RI2;  
  if((lParam&0xc0000000)==0xc0000000){// Key up Ao&\EcIOT  
   switch(wParam) ,R'@%,/  
   { IC#>X5  
    case VK_MENU: IM:=@a{  
     MaskBits&=~ALTBIT; |M>eEE*F<  
     break; 6BY-^"W5`  
    case VK_CONTROL: oeKHqP wg  
     MaskBits&=~CTRLBIT; K\>tA)IPSV  
     break; kd=GCO  
    case VK_SHIFT: __`*dL>*  
     MaskBits&=~SHIFTBIT; b_,|>U  
     break; uXI_M)  
    default: //judge the key and send message &K[_J  
     break; 3t`P@nL0;  
   } J c g,#@  
   for(int index=0;index<MAX_KEY;index++){ _,zA ^*b  
    if(hCallWnd[index]==NULL) _]04lGx27  
     continue; Mx6@$tQ%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M^MdRu  
    { l*ayd>`~x  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \qR7mI/*  
     bProcessed=TRUE; `Y BC  
    } INcg S MM  
   } X- pqw~$  
  } 7q?9Tj3  
  else if((lParam&0xc000ffff)==1){ //Key down *n; !G8\  
   switch(wParam) AcS|c:3MUy  
   { O>qll 6]{@  
    case VK_MENU: `D>S;[~S7  
     MaskBits|=ALTBIT; ~Cl){8o  
     break; #OBJzf*p  
    case VK_CONTROL: 6S\C}U/   
     MaskBits|=CTRLBIT; >C7r:%  
     break; xgABpikC^  
    case VK_SHIFT: rE i Ki  
     MaskBits|=SHIFTBIT; ~oI1 zNz/  
     break; ~;Ov-^tp  
    default: //judge the key and send message 3Th'paMG  
     break; 09dK0H3(  
   } m/v9!'cMI  
   for(int index=0;index<MAX_KEY;index++) k xP-,MD  
   { uJOJ-5}yt  
    if(hCallWnd[index]==NULL) (H)2s Y  
     continue; 4 d;|sI@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) VK}fsOnj0  
    { QN@CPuy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); I{ HN67O  
     bProcessed=TRUE; aki _RG>U'  
    } HKF H/eV  
   } Kpb#K[(]&  
  } =fu :@+  
  if(!bProcessed){ w<zIAQN  
   for(int index=0;index<MAX_KEY;index++){ Ks=>K(V6  
    if(hCallWnd[index]==NULL) h lkn%  
     continue; W;_nK4$%'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) q/4YS0CqE  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Nqw&< x+  
   } 8S>&WR%jH]  
  } ([ jF4/  
 } `n$I]_}/%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :/y1yM  
} z."a.>fPaO  
9U{a{~b  
BOOL InitHotkey() D-8O+.@  
{ %TX@I$Ba  
 if(hHook!=NULL){ 'pm2n0  
  nHookCount++; m6n?bEl6I  
  return TRUE; wm]^3q I2  
 } MG[o%I96  
 else Ne#WI'  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); +lJG(Qd  
  if(hHook!=NULL) p+l!6  
   nHookCount++; ElS9?Q+  
  return (hHook!=NULL); r~N"ere26  
} )A!>=2M `  
BOOL UnInit() (EK"V';   
{ OC1I&",Ai|  
 if(nHookCount>1){ u1t% (_h  
  nHookCount--; $SM# < @  
  return TRUE; $tz;<M7B  
 } )_{dWf1  
 BOOL unhooked = UnhookWindowsHookEx(hHook); kHXL8k#T  
 if(unhooked==TRUE){ SfgU`eF%B  
  nHookCount=0; ! vP[;6  
  hHook=NULL; mu?Eco`~  
 } )p T?/ J  
 return unhooked; 7s"< 'cx_F  
} VS9`{  
3BB%Z 6F  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) uIcn{RZ_z  
{ A'G66ei  
 BOOL bAdded=FALSE; " Om[~-31  
 for(int index=0;index<MAX_KEY;index++){ ktj]:rCkF  
  if(hCallWnd[index]==0){ C K:y?  
   hCallWnd[index]=hWnd; Yiry["[]Q  
   HotKey[index]=cKey; T _sTC)&a  
   HotKeyMask[index]=cMask; :/:.Kb  
   bAdded=TRUE; 8aO~/i:(.  
   KeyCount++; s_x:T<]  
   break; @7n/Q(  
  } @kk4]:,w  
 }  -QOw8vm  
 return bAdded; {LX.iH9}l  
}  Mu2  
Sl-v W  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,oaw0Vw  
{ {z(xFrY  
 BOOL bRemoved=FALSE; .uyGYj-C  
 for(int index=0;index<MAX_KEY;index++){ ZQ)>s>-  
  if(hCallWnd[index]==hWnd){ Yu?95qktP  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <,3^|$c%  
    hCallWnd[index]=NULL; Swp;HW7x  
    HotKey[index]=0; |AcRIq  
    HotKeyMask[index]=0; g0>,%b  
    bRemoved=TRUE; WA]c=4S  
    KeyCount--; Vm(1G8 a  
    break; GDu~d<RH  
   } 2R=DB`3  
  } bhkUKxd  
 } SG-'R1 J  
 return bRemoved; }:u~K;O87  
} FL(6?8zK  
(S xR`QP?,  
void VerifyWindow() Mu{;vf|j  
{ Nc+,&R13m  
 for(int i=0;i<MAX_KEY;i++){ o4*+T8[|5  
  if(hCallWnd!=NULL){ 58%#DX34M  
   if(!IsWindow(hCallWnd)){ S:TgFt0  
    hCallWnd=NULL; >Y_*%QGH_  
    HotKey=0; Jd5:{{ Lb  
    HotKeyMask=0; A,\6nO67  
    KeyCount--; k$H%.l;E  
   } '~ ,p[  
  } ][W_[0v  
 } K?s+3  
} FDVcow*]n  
l5\"9 ,<  
BOOL CHookApp::InitInstance() UNPezHaz  
{ C0S^h<iSe*  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); w"OP8KA:^T  
 hins=AfxGetInstanceHandle(); L3 G \  
 InitHotkey(); M9y <t'  
 return CWinApp::InitInstance(); TUHi5K  
} wD68tG$  
\[gReaI  
int CHookApp::ExitInstance() {?J/c{=/P  
{ :4MB]v[K  
 VerifyWindow(); A,%C,*)Cg  
 UnInit(); Hir Fl  
 return CWinApp::ExitInstance(); D8>enum  
} n) k1  
({JHZ6uZ  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file YqPQ%  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) zX0md x<|<  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ uiJS8(Cb  
#if _MSC_VER > 1000 g.'yZvaP  
#pragma once x9x E&  
#endif // _MSC_VER > 1000 87:!C5e}  
5aln>1x>hn  
class CCaptureDlg : public CDialog t Z`z  
{ _~q?_'kx  
 // Construction v^zu:Z*  
 public: p/U+0f  
  BOOL bTray; bYi`R)  
  BOOL bRegistered; 2RN)<\P  
  BOOL RegisterHotkey(); &Y 4F!Rb  
  UCHAR cKey; hQ(qbt{e  
  UCHAR cMask; 'ihhoW8  
  void DeleteIcon(); Qu} W/j|3  
  void AddIcon(); 1Wm)rXW[x  
  UINT nCount; ^s@8VAwi  
  void SaveBmp(); c)A{p  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor P>sFV  
  // Dialog Data ,Z{d.[$  
  //{{AFX_DATA(CCaptureDlg) dn }`i  
  enum { IDD = IDD_CAPTURE_DIALOG }; z]2]XTmWs  
  CComboBox m_Key; i&vaeP25)  
  BOOL m_bControl; v.:3"<ur}  
  BOOL m_bAlt; uu}x@T@  
  BOOL m_bShift;  )$`wIp  
  CString m_Path; TQ{Han!  
  CString m_Number; }|5 V RJA  
  //}}AFX_DATA -i4&v7"  
  // ClassWizard generated virtual function overrides =egW  
  //{{AFX_VIRTUAL(CCaptureDlg) I!>\#K  
 public: {X[ HCfJd  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Ux#x#N  
 protected: Qt,M!i,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `ORECg)  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); e"'#\tSG  
  //}}AFX_VIRTUAL zGc: @z  
  // Implementation n+BJxu?  
 protected: 3/b;7\M  
  HICON m_hIcon; +,yK;^b  
  // Generated message map functions zoDH` h_  
  //{{AFX_MSG(CCaptureDlg) .Wq@gV  
  virtual BOOL OnInitDialog(); K"b`#xN(t  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ZR$'u%+g'  
  afx_msg void OnPaint(); Yr w$  
  afx_msg HCURSOR OnQueryDragIcon(); rp6q?3=g  
  virtual void OnCancel(); j6  
  afx_msg void OnAbout(); >IX/< {);M  
  afx_msg void OnBrowse(); )r[&RGz6  
  afx_msg void OnChange(); hSK;V<$[Z  
 //}}AFX_MSG ,oNOC3 U  
 DECLARE_MESSAGE_MAP() M)+$wp  
}; Ndo a4L)$  
#endif C=s1R;"H  
!A>z(eIsv`  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ?UK|>9y}Z  
#include "stdafx.h" 7C$ 5  
#include "Capture.h" cZ(elZ0~  
#include "CaptureDlg.h" 0b/WpP  
#include <windowsx.h> f)g7 3=  
#pragma comment(lib,"hook.lib") -AhwI  
#ifdef _DEBUG t\RF=BbJJ  
#define new DEBUG_NEW B%KG3]  
#undef THIS_FILE wtT}V=_  
static char THIS_FILE[] = __FILE__; &z]K\-xp  
#endif lip[n;Ir>  
#define IDM_SHELL WM_USER+1 8[|UgI,>z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4n %?YQ[t  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kKPi:G52F  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; W`"uu.~f  
class CAboutDlg : public CDialog eL4NB$Fb  
{ "wlt> SU  
 public:  f>s?4  
  CAboutDlg(); r}0\}~'?c  
  // Dialog Data ?H_ LX;r  
  //{{AFX_DATA(CAboutDlg) [! 'op0  
  enum { IDD = IDD_ABOUTBOX }; #U*_1P0h  
  //}}AFX_DATA `Pw*_2  
  // ClassWizard generated virtual function overrides `60gFVu  
  //{{AFX_VIRTUAL(CAboutDlg) #-8\JEn  
 protected: MwfOy@|N  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support '{ [5M!B  
  //}}AFX_VIRTUAL gJ;_$`  
  // Implementation L:(1ZS  
 protected: .<z!3O&L  
  //{{AFX_MSG(CAboutDlg) {8R"O{  
  //}}AFX_MSG McoK@q ;  
  DECLARE_MESSAGE_MAP() P_c,BlfGMH  
}; 7},)]da>,'  
w=|GJ 0  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) *=fr8  
{ 2DB7+aZ*  
 //{{AFX_DATA_INIT(CAboutDlg) `+t.!tv!  
 //}}AFX_DATA_INIT l~D N1z6`  
} >6oOZbUY0  
it> r+%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) I+ es8  
{ xr7+$:>a  
 CDialog::DoDataExchange(pDX); <" @zn  
 //{{AFX_DATA_MAP(CAboutDlg) vsL[*OeI  
 //}}AFX_DATA_MAP x Au/  
} ,v&L:a  
+kq'+Y7  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) i5>+}$1  
 //{{AFX_MSG_MAP(CAboutDlg) {V1Pp;A  
 // No message handlers n!6Z]\8~$  
 //}}AFX_MSG_MAP '|7Woxl9  
END_MESSAGE_MAP() |7B!^ K  
[>^PRs  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Q#(GI2F2#  
: CDialog(CCaptureDlg::IDD, pParent) BS&;n  
{ SlSM+F  
 //{{AFX_DATA_INIT(CCaptureDlg) k|BHnj  
  m_bControl = FALSE; vA)O {W\o  
  m_bAlt = FALSE; k8,?hX:  
  m_bShift = FALSE; s/:Fwr4q#a  
  m_Path = _T("c:\\"); *cTO7$\[  
  m_Number = _T("0 picture captured."); 8 4i_k  
  nCount=0; 3+J0!FVla  
  bRegistered=FALSE; v|ox!0:#  
  bTray=FALSE; ;f,c't@w  
 //}}AFX_DATA_INIT JbO ~n )%x  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]#/4Y_d  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Gn)y> AN  
} "lNzGi-H  
]I/Vbs  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) M0| 'f'  
{ .)|a2d ~F  
 CDialog::DoDataExchange(pDX); G pbC M~x  
 //{{AFX_DATA_MAP(CCaptureDlg) cECi')  
  DDX_Control(pDX, IDC_KEY, m_Key); htm{!Z]s0  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); q> s-Y|  
  DDX_Check(pDX, IDC_ALT, m_bAlt); h;V,n  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); w[_x(Ojq;  
  DDX_Text(pDX, IDC_PATH, m_Path); =SD\Q!fA  
  DDX_Text(pDX, IDC_NUMBER, m_Number); \<vNVz7.D  
 //}}AFX_DATA_MAP WZ!WxX>zO  
} - O"i3>C  
yAL1O94  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) "+?Cz !i   
//{{AFX_MSG_MAP(CCaptureDlg) fWF |,A>>b  
 ON_WM_SYSCOMMAND() ^). )  
 ON_WM_PAINT() D;Gq)]O  
 ON_WM_QUERYDRAGICON() OzT#1T1'c  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) CzV(cSS9-  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) {F N;'Uc  
 ON_BN_CLICKED(ID_CHANGE, OnChange) iqhOi|!  
//}}AFX_MSG_MAP G5D2oQa=8  
END_MESSAGE_MAP() CK_(b"  
* n(> ^  
BOOL CCaptureDlg::OnInitDialog() `]$?uQ  
{ M+wt_ _vHf  
 CDialog::OnInitDialog(); #a| L3zR5v  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); $jd<v1"o  
 ASSERT(IDM_ABOUTBOX < 0xF000); 19(Dj&x  
 CMenu* pSysMenu = GetSystemMenu(FALSE); >x3ug]Bu  
 if (pSysMenu != NULL) Px M!U!t  
 { kl1Y] ?z}  
  CString strAboutMenu; E3a_8@ZB7  
  strAboutMenu.LoadString(IDS_ABOUTBOX); < Fs-3(V+\  
  if (!strAboutMenu.IsEmpty()) _,6f#t  
  { 7GZgu$'  
   pSysMenu->AppendMenu(MF_SEPARATOR); I8H%=Kb?9  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); IMQ]1uq0$  
  } dSIH9D  
 } U-0#0}_  
 SetIcon(m_hIcon, TRUE); // Set big icon HNa]H;-+5  
 SetIcon(m_hIcon, FALSE); // Set small icon NYABmI/0c  
 m_Key.SetCurSel(0); ig0u^BC  
 RegisterHotkey(); Q36)7=at  
 CMenu* pMenu=GetSystemMenu(FALSE); iA!7E;o  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);  Voh hQ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ]%RNA:(F'  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); +VEU:1Gt  
 return TRUE; // return TRUE unless you set the focus to a control )[&_scSa  
} R.j1?\  
Fk^3a'/4KJ  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) lEPAP|~uw  
{ {OT:3SS7  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) j1Yq5`ia  
 { 7.<^j[?  
  CAboutDlg dlgAbout; {+("C] b  
  dlgAbout.DoModal(); 4ZT A>   
 } y?30_#[dN  
 else L6 6-LMkH  
 { +TN9ujL6@  
  CDialog::OnSysCommand(nID, lParam); tJ& 5tNl  
 } A%Z)wz{  
} (}!C4S3#  
(#(O r  
void CCaptureDlg::OnPaint() lS{r=y_0.  
{ kvsA]tK.  
 if (IsIconic()) # Oup^ o@  
 { AyE\fY5  
  CPaintDC dc(this); // device context for painting &h$|j  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Y9r3XhVI  
  // Center icon in client rectangle }bB` (B,m  
  int cxIcon = GetSystemMetrics(SM_CXICON); h3u1K>R)  
  int cyIcon = GetSystemMetrics(SM_CYICON); ]_*S~'x  
  CRect rect; ED![^=  
  GetClientRect(&rect); ARh6V&Hi-  
  int x = (rect.Width() - cxIcon + 1) / 2; w#G2-?aj  
  int y = (rect.Height() - cyIcon + 1) / 2; @?B6aD|jE  
  // Draw the icon Q^eJ4{Ya:  
  dc.DrawIcon(x, y, m_hIcon); oB c@]T5>  
 } |bZM/U=  
 else m.%`4L^`T  
 { Aq#/2t  
  CDialog::OnPaint(); #y"=Cz=1u7  
 } ,*,sw:=2  
} `?s.\Dh  
}GHxG9!z  
HCURSOR CCaptureDlg::OnQueryDragIcon() US?Rr  
{ ~el-*=<m  
 return (HCURSOR) m_hIcon; _JGs}aQ  
} j kn^Z":  
{^q)^<#JT  
void CCaptureDlg::OnCancel() ?~ULIO'  
{ 9$d.P6|d>  
 if(bTray) }4c/YP"a'E  
  DeleteIcon(); 2BB<mv K4  
  CDialog::OnCancel(); Ef7:y|?  
} |qjZ38;6  
#I\Y= XCY  
void CCaptureDlg::OnAbout() R U!?-#*  
{ PE@+w#i7*  
 CAboutDlg dlg; 7h<> k*E)  
 dlg.DoModal(); V+B71\x<  
} KI&:9j+M)  
*FgJ|y6gk  
void CCaptureDlg::OnBrowse() CyM}Hc&w  
{ %l9$a`&  
 CString str;  7 Yv!N  
 BROWSEINFO bi; mv Ov<x;l  
 char name[MAX_PATH]; ~I_owCVZ  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 8<PKKDgbfd  
 bi.hwndOwner=GetSafeHwnd(); E[Bo4?s&^  
 bi.pszDisplayName=name; zj M/M  
 bi.lpszTitle="Select folder"; P{oAObP%  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ~a+NJ6e1  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <O857 j  
 if(idl==NULL) `6w#8}  
  return; k khE}qSD  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); i Q`]ms+  
 str.ReleaseBuffer(); DvT+`X?R  
 m_Path=str; /8CY0Ey  
 if(str.GetAt(str.GetLength()-1)!='\\') *{/@uO  
  m_Path+="\\"; F&@|M(  
 UpdateData(FALSE); ]A:( L9  
} sB7" 0M  
m/${8  
void CCaptureDlg::SaveBmp() y$oW!  
{ i2F(GH?p[  
 CDC dc; aw$Y`6,S  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); xks?y.wA  
 CBitmap bm; zNtq"T[  
 int Width=GetSystemMetrics(SM_CXSCREEN); VuWib+fT  
 int Height=GetSystemMetrics(SM_CYSCREEN); }C~]=Z  
 bm.CreateCompatibleBitmap(&dc,Width,Height); fD6GQ*  
 CDC tdc; emWGIo  
 tdc.CreateCompatibleDC(&dc); q.oLmX  
 CBitmap*pOld=tdc.SelectObject(&bm); @FX{M..  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); \|+/0 USn  
 tdc.SelectObject(pOld); Cd~LsdKE5  
 BITMAP btm; /7p>7q 9g  
 bm.GetBitmap(&btm); *TnzkNN_,  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; nxRwWj57  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 8M93cyX  
 BITMAPINFOHEADER bih; F' BdQk3o  
 bih.biBitCount=btm.bmBitsPixel; CIQwl 6H9  
 bih.biClrImportant=0; sJ6a7A8)  
 bih.biClrUsed=0; {e9Y !oFg  
 bih.biCompression=0; ,YlQK;  
 bih.biHeight=btm.bmHeight; L+R >%d s  
 bih.biPlanes=1; vfbe$4mH  
 bih.biSize=sizeof(BITMAPINFOHEADER); TA)LPBG  
 bih.biSizeImage=size; k^*$^;z  
 bih.biWidth=btm.bmWidth; 1X:&* a"5  
 bih.biXPelsPerMeter=0; h3 @s2 fK  
 bih.biYPelsPerMeter=0; d.\PS9l  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _t.FL@3e  
 static int filecount=0; fOBN=y6x  
 CString name; T|+$@o  
 name.Format("pict%04d.bmp",filecount++); |\{Nfm=:%  
 name=m_Path+name; OOLe[P3J3  
 BITMAPFILEHEADER bfh; pG28M]\  
 bfh.bfReserved1=bfh.bfReserved2=0; JK^[{1 JI  
 bfh.bfType=((WORD)('M'<< 8)|'B'); hWxT!  
 bfh.bfSize=54+size; 84Zgo=P}  
 bfh.bfOffBits=54; 5; f\0<-  
 CFile bf; Tk+DPp^  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ $c9=mjwH  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )>$^wT  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,>S+-L8  
  bf.WriteHuge(lpData,size); 9.-47|-9C  
  bf.Close(); oc;VIK)g]c  
  nCount++; Hja^edLj  
 } ay[ZsQC  
 GlobalFreePtr(lpData); cHEz{'1m  
 if(nCount==1) ,wT g$ g-$  
  m_Number.Format("%d picture captured.",nCount); B/_6Ieb+  
 else EIK*49b2  
  m_Number.Format("%d pictures captured.",nCount); 6+ANAk  
  UpdateData(FALSE); {Q<0\`A  
} %BICt @E  
Q?]w{f(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 4?]ZV_BD  
{ 1 PIzV:L\  
 if(pMsg -> message == WM_KEYDOWN) >)sqh ~P  
 { |8'B/ p=  
  if(pMsg -> wParam == VK_ESCAPE) s!`H  
   return TRUE; T9y768%  
  if(pMsg -> wParam == VK_RETURN) uN(b.5y  
   return TRUE; -mC:r&Y>[  
 } d#7]hF  
 return CDialog::PreTranslateMessage(pMsg); w`Xg%*]}  
} ^BNp`x;;`  
AA.Ys89V  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) x\]z j!  
{ SJ[AiHR  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ j!CU  
  SaveBmp(); TU-c9"7M~  
  return FALSE; MA"#rOcP  
} eaxfn]gV  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ fp-m.d:|  
 CMenu pop; I4ctxMVP  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 3.~h6r5-  
 CMenu*pMenu=pop.GetSubMenu(0); 9 P~d:'Ib  
 pMenu->SetDefaultItem(ID_EXITICON); & qL<C  
 CPoint pt; #'iPDRYy  
 GetCursorPos(&pt);  Q>[Ce3  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); X\'E4  
 if(id==ID_EXITICON) z.j4tc9F/5  
  DeleteIcon(); j88=f#<  
 else if(id==ID_EXIT) >F|qb*Tm7  
  OnCancel(); d/4ubf+$k  
 return FALSE; )^(P@D.L  
} 6d};|#}  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); k%!VP=c4s  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) v*XkWH5  
 AddIcon(); uZ<%kV1B  
 return res; #AvEH=:  
} 6~3jn+K$1  
F'ENq6  
void CCaptureDlg::AddIcon() &|NZ8:*+#  
{ {YBl:rMz  
 NOTIFYICONDATA data; 'DeW<Sa~  
 data.cbSize=sizeof(NOTIFYICONDATA); a>?p.!BM  
 CString tip; LhZZc`|7t  
 tip.LoadString(IDS_ICONTIP); -B,cB  
 data.hIcon=GetIcon(0); ZGzc"r(r:#  
 data.hWnd=GetSafeHwnd(); IuDT=A  
 strcpy(data.szTip,tip); iA&oLu[y3  
 data.uCallbackMessage=IDM_SHELL; qz87iJp&  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; +`9yZOaC#  
 data.uID=98; >mew"0Q  
 Shell_NotifyIcon(NIM_ADD,&data); u(8~4P0w  
 ShowWindow(SW_HIDE); F6DxvyANr  
 bTray=TRUE; {9Db9K^  
} *afejjW[  
A ^-Z)0 :  
void CCaptureDlg::DeleteIcon() yW{mK  
{ *b:u * `@  
 NOTIFYICONDATA data; e$H|MdYIA  
 data.cbSize=sizeof(NOTIFYICONDATA); q _19&;&  
 data.hWnd=GetSafeHwnd(); Yu1QcFuy  
 data.uID=98; cNx \&vpd  
 Shell_NotifyIcon(NIM_DELETE,&data); TG4^_nRl  
 ShowWindow(SW_SHOW); gh'kUZG a  
 SetForegroundWindow(); xSdN5RN  
 ShowWindow(SW_SHOWNORMAL); K_Z+]]$#  
 bTray=FALSE; Z~:/#?/  
} p8$\uo9YQ  
:|zp8|  
void CCaptureDlg::OnChange() ~K_]N/ >  
{ #gF2(iK6  
 RegisterHotkey(); ^uM_b  
} BB0g}6M  
/G{&[X<4U  
BOOL CCaptureDlg::RegisterHotkey() 8NxUx+]  
{ 4bPqmEE  
 UpdateData(); G 2!}R  
 UCHAR mask=0; ypgliq(  
 UCHAR key=0; IN<:P  
 if(m_bControl) )CFk`57U  
  mask|=4; +jv }\Jt  
 if(m_bAlt) G2=F8kL  
  mask|=2; D 8gQR Q  
 if(m_bShift) ?U}sQ;c$  
  mask|=1; vwm|I7/w  
  key=Key_Table[m_Key.GetCurSel()]; y9=t;qH@|  
 if(bRegistered){ 8?A@/  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); o@Scz!"g  
  bRegistered=FALSE; U.Pa7tn  
 } D xe-XKNc.  
 cMask=mask; -|6V}wHg~  
 cKey=key; KBd7|,j  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); q|R+x7x  
 return bRegistered;  ^8b~ZX  
} ! Zno[R  
QjehDwt|  
  四、小结 c5Z;%v |y  
;_>s0rUV  
  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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