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用Visual C++实现屏幕抓图程序

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 在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示: 7-LeJRB  
  ALv\"uUNu+  
  一、实现方法 -1o1k-8d  
Mc8^{br61  
  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: 83h3C EQ  
v+OVZDf  
#pragma data_seg("shareddata") 0 QpWt  
HHOOK hHook =NULL; //钩子句柄 Z/x1?{z  
UINT nHookCount =0; //挂接的程序数目 yx-"YV}5  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 -"<f(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 V1fPH;  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey HfF$>Z'kM  
static int KeyCount =0; !d^`YEfE  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 cBA[D~s  
#pragma data_seg() Nt'5}  
zk]~cG5dT/  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 K?>&Mr  
l\5 NuCgRY  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: usA!MMH4  
L_~G`Rb3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR O^GXFz^  
cKey,UCHAR cMask) 7'I7   
{ 3:gk:j#  
 BOOL bAdded=FALSE; 5Zov< +kE  
 for(int index=0;index<MAX_KEY;index++){ 1K`A.J:Uy  
  if(hCallWnd[index]==0){ BCbW;w8aI  
   hCallWnd[index]=hWnd; /[s$A?  
   HotKey[index]=cKey; ra&C|"~E  
   HotKeyMask[index]=cMask; %F~ dmA#:  
   bAdded=TRUE; ~IXfID!8  
   KeyCount++; jt3SA [cy  
   break; (nzt}i0  
  } V6k9L*VP  
 } `et<Z  
 return bAdded; c>g%oE  
} W@tLT[}CG  
//删除热键 6PH*]#PfoD  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )N/KQ[W  
{ j7d;1 zB+G  
 BOOL bRemoved=FALSE; cG?266{g  
 for(int index=0;index<MAX_KEY;index++){ $d"+Njd  
  if(hCallWnd[index]==hWnd){ V*aTDU%-.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ { \ePJG#  
    hCallWnd[index]=NULL; 4Bn+L,}.  
    HotKey[index]=0; *.RVH<W=8  
    HotKeyMask[index]=0; 9 2EMDKJ  
    bRemoved=TRUE; -&? -  
    KeyCount--; 4Q>F4 v`  
    break; -%.V0=G(Z  
   } iH>djGhTh  
  } mm8O  
 } { SfU!  
 return bRemoved; $W]bw#NH  
} Oc.>$  
H]e 2d|  
,zFN3NLtA  
  DLL中的钩子函数如下: f"Iyo:Wt  
#vSI_rt9I  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) b<n)`;  
{ %?fzT+-=%  
 BOOL bProcessed=FALSE; H4,yuV  
 if(HC_ACTION==nCode) 4Z] 35*  
 { C#Jj;Gd  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 msylb~^  
   switch(wParam) wu')Q/v  
   {  d%hA~E1rR  
    case VK_MENU: 3fPv71NVtt  
     MaskBits&=~ALTBIT; A=K1T]o  
     break; wLbngO=VG  
    case VK_CONTROL: =Ug_1w  
     MaskBits&=~CTRLBIT; .p`'^$X^  
     break; > =H8>X  
    case VK_SHIFT: X\%3uPQ  
     MaskBits&=~SHIFTBIT; : +Kesa:E  
     break; 0h#M)Ft  
    default: //judge the key and send message 2e"}5b5  
     break; _HsvF[\[  
   } sYpogFfV  
   for(int index=0;index<MAX_KEY;index++){ 9[D7N  
    if(hCallWnd[index]==NULL) YC'~8\x3z  
     continue; @Hh"Y1B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;[9Is\  
    { 4lCm(#T{,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); b G)MG0<TT  
     bProcessed=TRUE; }b`*%141  
    } |xm|Q(PG  
   } ;>N ~ ,Q  
  } z3]U% y(,  
  else if((lParam&0xc000ffff)==1){ //有键按下 639k&"V  
   switch(wParam) Mk[`HEO  
   { YqgW8 EM  
    case VK_MENU: /5Loj&!=  
     MaskBits|=ALTBIT;  4&D="GA  
     break; @:B1  
    case VK_CONTROL: >gJWp@6V  
     MaskBits|=CTRLBIT; qgNK!(kWpr  
     break; 3;:V1_JA  
    case VK_SHIFT: ^q\zC%.  
     MaskBits|=SHIFTBIT; L:-lqag!  
     break; s`RJl V  
    default: //judge the key and send message s 'x mv{|  
     break; A]$+ `uS\  
   } k#xpY!'7  
   for(int index=0;index<MAX_KEY;index++){ ".f:R9-  
    if(hCallWnd[index]==NULL) 5g5NTm`=<  
     continue; Umg81!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) H%]ch6C  
    { n~j[Pw  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |U $-d^ZJ  
     bProcessed=TRUE; tpONSRY  
    } <>s\tJ  
   } 6^;!9$G|D*  
  } lvi:I+VgA  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 J B@VP{  
   for(int index=0;index<MAX_KEY;index++){ W?-BT >#s  
    if(hCallWnd[index]==NULL) "M^W:4_  
     continue; DT4RodE$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) kB#vh  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); bl_WN|SQ  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ^ {f ^WL=  
   } zi .,?Q  
  } 0(x@ NGb>{  
 } yan[{h]EZ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _#m qg]W'  
} bq-\'h f<  
ton`ji\^  
  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: :g[x;Q [@  
{LHe 6#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x35s6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tL{~O=  
.N&}<T[  
  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: _9|@nUD  
"%*lE0Tx  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *J5RueUG  
{ |wQZ~Ux:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) X388Gs;e  
 {  twmJ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 n5*7~K "C  
  SaveBmp(); y51D-vj  
  return FALSE; E^a `IA  
 } IQe[ CcM  
 …… //其它处理及默认处理 QYXx7h r=$  
} 'hw@l>1\9  
92VX5?Cyg  
`e>F<{ M6@  
  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。 @n* D>g  
6xh#;+e }  
  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。 _PUm Pom.  
;<@6f@  
  二、编程步骤 rq["O/2  
lFGxW 5  
  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"; {))S<_ yN  
OG7v'vmY  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; w*%$ lhp!  
zB" `i  
  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; EZQ+HECpK  
~PW}sN6ppG  
  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; hRIS [#z;U  
<<5 :zlb  
  5、 添加代码,编译运行程序。 |!5T+H{Sj  
5|G3t`$pa  
三、程序代码 #aY<J:Nx  
1[g!^5W  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL y6jmn1K  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) gzCMJ<3!D  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ %%cSvPcz  
#if _MSC_VER > 1000  Cmx2/N  
#pragma once 0nq}SH  
#endif // _MSC_VER > 1000 p6Dv;@)Yn  
#ifndef __AFXWIN_H__ wx%nTf/Oa  
#error include 'stdafx.h' before including this file for PCH !riMIl1  
#endif f\_!N "HW  
#include "resource.h" // main symbols w <>6>w@GZ  
class CHookApp : public CWinApp wU)5Evp[  
{ S{i@=:  
 public: L Yg$M@  
  CHookApp(); J:Y|O-S!  
  // Overrides Po11EZa$a  
  // ClassWizard generated virtual function overrides -s%-*K+,W  
  //{{AFX_VIRTUAL(CHookApp) GL =XiBt  
 public: iSz@E&[X  
  virtual BOOL InitInstance(); m2q;^o:J  
  virtual int ExitInstance(); 3k*:B~1  
  //}}AFX_VIRTUAL :CST!+)o  
  //{{AFX_MSG(CHookApp) C1B3VG  
  // NOTE - the ClassWizard will add and remove member functions here. qvU$9cTY  
  // DO NOT EDIT what you see in these blocks of generated code ! G<-9U}~76  
  //}}AFX_MSG yX.5Y|A<  
  DECLARE_MESSAGE_MAP() k-cIb@+"  
}; f@Rpb}zg+C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); FWpN:|X BS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4:eq{n  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *tfDXQ^mN  
BOOL InitHotkey(); 1;kG[z=A  
BOOL UnInit(); +}XL>=-5  
#endif ciGpluQF  
N!Wq}#&l  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. `Ivw`}L  
#include "stdafx.h" Z++Z@J"  
#include "hook.h" m7wc)"`t  
#include <windowsx.h> ?WQd  
#ifdef _DEBUG 'Rkvsch  
#define new DEBUG_NEW pG F5aF7T  
#undef THIS_FILE CziaxJ  
static char THIS_FILE[] = __FILE__; "ex~ LB  
#endif :7Z\3_D/  
#define MAX_KEY 100 R(? <97  
#define CTRLBIT 0x04 [mf7>M`p]@  
#define ALTBIT 0x02  J"Y   
#define SHIFTBIT 0x01 EOPS? @  
#pragma data_seg("shareddata") t>6x)2,TC  
HHOOK hHook =NULL; c."bTq4tJ  
UINT nHookCount =0; r]JC~{  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Pm#x?1rAj  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT B==a  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ;;w6b:}-c  
static int KeyCount =0; #ON#4WD?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ,;cel^.b  
#pragma data_seg() }]g95xT  
HINSTANCE hins; jQxPOl$-  
void VerifyWindow(); <qq'h  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) UC+7-y,  
//{{AFX_MSG_MAP(CHookApp) VU`z|nBW@  
// NOTE - the ClassWizard will add and remove mapping macros here. x<*IF,o  
// DO NOT EDIT what you see in these blocks of generated code! aEEz4,x_  
//}}AFX_MSG_MAP aFr!PQp4{  
END_MESSAGE_MAP() k99gjL`  
6a%:zgkOpu  
CHookApp::CHookApp() -_EY$ ?4  
{ [Zt# c C+  
 // TODO: add construction code here, >^H'ZYzw  
 // Place all significant initialization in InitInstance Cb )=n6  
} hViprhC  
<nw <v9Z  
CHookApp theApp; s la*3~ ?*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) _<%\h?W$  
{ )+w/\~@  
 BOOL bProcessed=FALSE; qJ X+[PJ  
 if(HC_ACTION==nCode) dI_r:xN  
 { gY>;|),  
  if((lParam&0xc0000000)==0xc0000000){// Key up QxL@'n#5   
   switch(wParam) J)$&z*!  
   { z{`6#  
    case VK_MENU: <;z[+6T  
     MaskBits&=~ALTBIT; $#G6m`V  
     break; OK M\"A4  
    case VK_CONTROL: O$"bd~X  
     MaskBits&=~CTRLBIT; ! v-w6WG"  
     break; K9C@dvFH  
    case VK_SHIFT: 4V228>9w  
     MaskBits&=~SHIFTBIT; = GH@.3`X  
     break; oN[Fza>  
    default: //judge the key and send message tKG;k"wk  
     break; @zr8%8n  
   } o <D3Y95b  
   for(int index=0;index<MAX_KEY;index++){ "M9TB. O  
    if(hCallWnd[index]==NULL) V~J*49t&2J  
     continue; l$qStL*8O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) '0R/6Z|/Y  
    { .K|P&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); BN\fv,  
     bProcessed=TRUE; W$JY M3!  
    } u\()E|?p  
   } Avs7(-L+s  
  } [}A_uOGEP  
  else if((lParam&0xc000ffff)==1){ //Key down P1)* q0  
   switch(wParam) x1m8~F  
   { 9feD!0A  
    case VK_MENU: ;OQ'B=uK  
     MaskBits|=ALTBIT; aQ!9#d_D  
     break; Pn'`Q S?  
    case VK_CONTROL: X"hOHx5P  
     MaskBits|=CTRLBIT; M>?aa6@0  
     break; `d}W;&c  
    case VK_SHIFT: I"8d5a}  
     MaskBits|=SHIFTBIT; C 'B4 mmC  
     break; j<l#qho{h  
    default: //judge the key and send message 8qFUYZtY  
     break; 69[V <1  
   } -O~C m}e  
   for(int index=0;index<MAX_KEY;index++) A$9q!Ui#d  
   { DC$7B`#D  
    if(hCallWnd[index]==NULL) <S\;k@f  
     continue; wUru1_zjO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) JdaFY+f :  
    { /e.FY9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ur/Oc24i1n  
     bProcessed=TRUE; U;';"9C2>  
    } jo,6Aog|u  
   } \3t,|%v  
  } :kWZSN8.D  
  if(!bProcessed){ Wk/fB0  
   for(int index=0;index<MAX_KEY;index++){ WdTbt  
    if(hCallWnd[index]==NULL) 4r_!>['`"  
     continue; U9<_6Bsd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *C4~}4WT\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); tv 4s12&  
   } -!XrwQyk  
  } :0M' =~[  
 } Ff[H>Lp~  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); u{g]gA8s  
} ?JuX~{{. L  
~8jThi U  
BOOL InitHotkey() **T:eI+  
{ "[awmZ:wo  
 if(hHook!=NULL){ =:4 '  
  nHookCount++; J Z %`%rA  
  return TRUE; W.yV/fu  
 } vx04h~  
 else kk 8R  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); t *o7,  
  if(hHook!=NULL) E=;BI">.  
   nHookCount++; Xy[}Gp  
  return (hHook!=NULL); Z -pyFK\  
} Qe2m8  
BOOL UnInit() tegOT]|  
{ c*.G]nRc  
 if(nHookCount>1){ d>^~9X  
  nHookCount--; 5>'?:jY  
  return TRUE; *w=z~Jq^R"  
 } /t$rX3A  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ,"@w>WL<9  
 if(unhooked==TRUE){ (3AYy0J%  
  nHookCount=0; rQ=xcn[A  
  hHook=NULL; MP jr_yc]  
 } hA@zoIoe  
 return unhooked; nped  
} lN);~|IOv7  
?$<SCN =  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9Tqn zD  
{ s0gJ f[  
 BOOL bAdded=FALSE; <Cu'!h_nL  
 for(int index=0;index<MAX_KEY;index++){ ;JAK[o8i  
  if(hCallWnd[index]==0){ i B%XBR  
   hCallWnd[index]=hWnd; dj3|f{kg{  
   HotKey[index]=cKey; Mx^y>\X)v  
   HotKeyMask[index]=cMask; 2y^U k,g  
   bAdded=TRUE; M,&tA1CH  
   KeyCount++; ; Zh9^0  
   break; buRhQ"  
  } :[ L{KFQU  
 } ~@xT]D!BQ  
 return bAdded; S2Zx &D/_  
} !)NYW4"  
]Fxku<z7|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >Q&CgGpW$  
{ Dq|GQdZ>o  
 BOOL bRemoved=FALSE; ya#RII']  
 for(int index=0;index<MAX_KEY;index++){ iA]DE`S  
  if(hCallWnd[index]==hWnd){ *K`x;r  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (m6EQoW^s+  
    hCallWnd[index]=NULL; ^#2xQ5h  
    HotKey[index]=0; Umij!=GPG^  
    HotKeyMask[index]=0; $Ru&>D#stK  
    bRemoved=TRUE; [@ILc*2O  
    KeyCount--; ebzzzmwo  
    break;  1y 7y0V  
   } Qy/uB$q{A  
  } #kj~G]QA  
 } ]Z=Ij gr$  
 return bRemoved; (/-lV&eR  
} v3 -5"q!Sq  
&i)helXs]  
void VerifyWindow() b)d^ `J  
{ B`#*o<eb  
 for(int i=0;i<MAX_KEY;i++){ 2_ wv C  
  if(hCallWnd!=NULL){ su}&".e^  
   if(!IsWindow(hCallWnd)){ Z A[)  
    hCallWnd=NULL; 00"CC  
    HotKey=0; /\d(c/,4  
    HotKeyMask=0; rjXnDh]MC  
    KeyCount--; *u}'}jC1X  
   } '|_/lz$h  
  } MBlBMUJk  
 } 2R\+}  
} 7"#f!.E  
lVP |W:~K  
BOOL CHookApp::InitInstance() |88CBiu}  
{ uj)yk*  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); d bCNhbN(  
 hins=AfxGetInstanceHandle(); Oc#>QZ3  
 InitHotkey(); ^}hJL7O'  
 return CWinApp::InitInstance(); z4bN)W )p  
}  ![ a  
dIvy!d2l  
int CHookApp::ExitInstance() RJ@\W=aZ  
{ JwB"\&'1ZS  
 VerifyWindow(); cu)U7  
 UnInit(); -A}zJBcR  
 return CWinApp::ExitInstance(); "w9`cz9a~J  
} qIz}$%!A  
*Z >  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 9j0o&Xn  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) EsTB(9c?  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ mzz$`M 1  
#if _MSC_VER > 1000 f9a$$nb3`  
#pragma once RtwUb(wn6  
#endif // _MSC_VER > 1000 |U EC  
)(lJT&e  
class CCaptureDlg : public CDialog <1K7@Tu  
{ 3-iD.IAUm@  
 // Construction YtpRy% R  
 public: 2[ksi51y  
  BOOL bTray; NZ+7p{&AN  
  BOOL bRegistered; sDX/zF6t  
  BOOL RegisterHotkey(); =HS4I.@c_5  
  UCHAR cKey; [ZD[a6(94  
  UCHAR cMask; hXc}r6<B  
  void DeleteIcon(); AX;c}0g  
  void AddIcon(); '$?du~L-  
  UINT nCount; }3J=DCtS  
  void SaveBmp(); eIJ[0c b}  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor |kc@L`7s  
  // Dialog Data Wxn#Rk#>  
  //{{AFX_DATA(CCaptureDlg) JCD?qeTg  
  enum { IDD = IDD_CAPTURE_DIALOG }; or!!s 5[d  
  CComboBox m_Key; e}e6r3faz  
  BOOL m_bControl; p31oL{D  
  BOOL m_bAlt; WFem#hq   
  BOOL m_bShift; 7E\g &R.  
  CString m_Path; O@wK[(w^  
  CString m_Number; \2>3Opt  
  //}}AFX_DATA kM;o0wi  
  // ClassWizard generated virtual function overrides ('JKN"3  
  //{{AFX_VIRTUAL(CCaptureDlg) xp^ 7#`MJ?  
 public: e1UITjy  
  virtual BOOL PreTranslateMessage(MSG* pMsg); x6v,lR  
 protected: p?kvW42/  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^KbL ,T  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); v%nP*i9  
  //}}AFX_VIRTUAL $''UlWK  
  // Implementation 1x{kl01m%  
 protected: _C$X04bU3V  
  HICON m_hIcon; XXm'6xD-  
  // Generated message map functions bcn7,ht  
  //{{AFX_MSG(CCaptureDlg) bb1  f/C%  
  virtual BOOL OnInitDialog(); #q;z8 @  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); |z*>ixK  
  afx_msg void OnPaint(); mf9hFy* <4  
  afx_msg HCURSOR OnQueryDragIcon(); Mg\TH./Y:  
  virtual void OnCancel(); *VDVC0R  
  afx_msg void OnAbout(); iZ "y7s  
  afx_msg void OnBrowse(); lE'wfUb  
  afx_msg void OnChange(); )~dOmfw%|  
 //}}AFX_MSG PS}73Y#  
 DECLARE_MESSAGE_MAP() {OP~8e"  
}; 6.19g'{sB  
#endif 1qZG`Vz  
NO4Z"3Pd_  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file S/7l/DFb  
#include "stdafx.h" pV=@sz,G  
#include "Capture.h" GW/WUzK  
#include "CaptureDlg.h" RX>2~^  
#include <windowsx.h> &a6,ln:P  
#pragma comment(lib,"hook.lib") !^?qU;|  
#ifdef _DEBUG RG1\=J$:E  
#define new DEBUG_NEW X!c?CL  
#undef THIS_FILE w.^yP7:  
static char THIS_FILE[] = __FILE__; +?AW>&68y  
#endif $8g42LR'  
#define IDM_SHELL WM_USER+1 p9iu:MucD<  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); V;;#/$oU:4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); N}mh}  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ~},W8\C>  
class CAboutDlg : public CDialog Z0\Iyc G  
{ t^U^Tr  
 public: SiTeB)/  
  CAboutDlg(); R6P\T\~E  
  // Dialog Data QC7k~I8  
  //{{AFX_DATA(CAboutDlg) CA*~2|  
  enum { IDD = IDD_ABOUTBOX }; #xp(B5  
  //}}AFX_DATA m9t$h  
  // ClassWizard generated virtual function overrides U&W"Ea=R/  
  //{{AFX_VIRTUAL(CAboutDlg) `0@z"D5c  
 protected: YPEnNt+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mNDuwDd$S  
  //}}AFX_VIRTUAL T5e^J"   
  // Implementation W;TJenv  
 protected: H1&RI4XC  
  //{{AFX_MSG(CAboutDlg) [.-a$J[4+F  
  //}}AFX_MSG a g;dc  
  DECLARE_MESSAGE_MAP() FN\GE\H  
}; kOI !~Qk  
"dtlME{Bx  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) %/pc=i|+  
{ IaasHo\  
 //{{AFX_DATA_INIT(CAboutDlg) 5g0_WpO  
 //}}AFX_DATA_INIT onnugj3  
} 7 :U8 f:  
t$I|E  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) l1r_b68  
{ 9/3;{`+[a  
 CDialog::DoDataExchange(pDX); JA6";fl;  
 //{{AFX_DATA_MAP(CAboutDlg) :<utq|#s  
 //}}AFX_DATA_MAP eaAPKx  
} _#pnjo   
1~Mn'O%  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) y6%<zhs  
 //{{AFX_MSG_MAP(CAboutDlg) #PFO]j!_b  
 // No message handlers D^?_"wjW  
 //}}AFX_MSG_MAP MLS;SCl  
END_MESSAGE_MAP() u)~s4tP4  
9rcI+q=E  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Y[G9Vok VX  
: CDialog(CCaptureDlg::IDD, pParent) 6fGK (r  
{ ]sL45k2W  
 //{{AFX_DATA_INIT(CCaptureDlg) dG0VBE  
  m_bControl = FALSE; KB[QZ`"%!  
  m_bAlt = FALSE; e U;jP]FA  
  m_bShift = FALSE; XwPx9+b6j  
  m_Path = _T("c:\\"); 8Q(8b@ZO,  
  m_Number = _T("0 picture captured."); n9] ~  
  nCount=0; P%)b+H{$h  
  bRegistered=FALSE; Le@? /  
  bTray=FALSE; sfI N)jh  
 //}}AFX_DATA_INIT BX3lP v  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 i0ybJOa4  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); LNiS`o\  
} a.,_4;'UE1  
+)gB9DoK  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) O-!,Jm   
{  `{}@@]  
 CDialog::DoDataExchange(pDX); &J(!8y*QyE  
 //{{AFX_DATA_MAP(CCaptureDlg) v3-?CQb(  
  DDX_Control(pDX, IDC_KEY, m_Key); I%xn,u  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); \_U*t!  
  DDX_Check(pDX, IDC_ALT, m_bAlt); &t_h'JX&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); c#pj:f*H  
  DDX_Text(pDX, IDC_PATH, m_Path); (.Xr#;\(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); t)r1"oA  
 //}}AFX_DATA_MAP PAoX$q  
} o , LK[Q  
?OsS`)T  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) y x;h  
//{{AFX_MSG_MAP(CCaptureDlg) [@2s&Ct;  
 ON_WM_SYSCOMMAND() w+_Wc~f  
 ON_WM_PAINT() 7#pZa.B)k  
 ON_WM_QUERYDRAGICON() }4h0bI  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) j@v-|  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) TQ'e  
 ON_BN_CLICKED(ID_CHANGE, OnChange) p;`N\.ld  
//}}AFX_MSG_MAP ' ^a!`"Bc  
END_MESSAGE_MAP() o](.368+4  
m[8 @Unt  
BOOL CCaptureDlg::OnInitDialog() /aOlYqM(>  
{ C +@ i  
 CDialog::OnInitDialog(); fS I%c3  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); * nCx[  
 ASSERT(IDM_ABOUTBOX < 0xF000); 9L  HuS  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Tz` ,{k  
 if (pSysMenu != NULL) g+|Bf&_  
 { 4_Y!elH)  
  CString strAboutMenu; 5;Ia$lm=y  
  strAboutMenu.LoadString(IDS_ABOUTBOX); %6i=lyH-  
  if (!strAboutMenu.IsEmpty()) `~nCbUUee  
  { =]b9X7}  
   pSysMenu->AppendMenu(MF_SEPARATOR); gZ`DT  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); C3.=GRg~l  
  } |Fp'/~|w2d  
 } wd+O5Lr.R  
 SetIcon(m_hIcon, TRUE); // Set big icon .bfST.OA  
 SetIcon(m_hIcon, FALSE); // Set small icon H,|YLKg-|  
 m_Key.SetCurSel(0); 4z0L ke  
 RegisterHotkey(); / O)6iJ  
 CMenu* pMenu=GetSystemMenu(FALSE); >{XScxaB`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); !Uy>eji}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); e1 ^l.>2d6  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); uV77E*+7\  
 return TRUE; // return TRUE unless you set the focus to a control c&e0OV\m  
} ^Y 7U1I  
,8VXA +'_  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) yVYkuO  
{ >76 |:Nq  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) <Uwwux<v  
 { U>A6eWhH  
  CAboutDlg dlgAbout; TQ-KkH}y  
  dlgAbout.DoModal(); jL_5]pzJ  
 } a8QfkOe  
 else G_(ct5:_"!  
 { @C_ =*  
  CDialog::OnSysCommand(nID, lParam); 2sun=3qb  
 } ^c'f<<z|7r  
} Hirr=a3  
wY`#$)O0*  
void CCaptureDlg::OnPaint() ZIW7_Y>_  
{ K~@`o-Z[  
 if (IsIconic()) O 6]u!NqG  
 { ]_ #SAhOR)  
  CPaintDC dc(this); // device context for painting gh61H:tkR  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); <<<NXsH  
  // Center icon in client rectangle (&c,twa~  
  int cxIcon = GetSystemMetrics(SM_CXICON); GNZ#q)qT  
  int cyIcon = GetSystemMetrics(SM_CYICON); {(0Id!  
  CRect rect; fTgbF{?xh  
  GetClientRect(&rect); }4KW@L[g  
  int x = (rect.Width() - cxIcon + 1) / 2; '!@A}&]  
  int y = (rect.Height() - cyIcon + 1) / 2; 8Fx]koP.  
  // Draw the icon mu>] 9ZW  
  dc.DrawIcon(x, y, m_hIcon); A]xCF{*)&  
 } 0_HJ.g!  
 else xB,/dMdTj  
 { e5L 1er;6  
  CDialog::OnPaint(); -XW8 LaQB  
 } 2@ *<9-9  
} Tzf$*Uje3  
8_ X.c  
HCURSOR CCaptureDlg::OnQueryDragIcon() xT=ySa$|>  
{ TrQm]9@  
 return (HCURSOR) m_hIcon; ^'Y HJEK  
} rkIMM,   
|0]YA  
void CCaptureDlg::OnCancel() 1tyNRoET  
{ $eMK{:$O  
 if(bTray) eI?HwP{m  
  DeleteIcon(); K1-+A2snhV  
  CDialog::OnCancel(); b"3uD`  
} k.Gl4 x  
f}blB?e  
void CCaptureDlg::OnAbout() wt\m+!u`  
{ =h7[E./U1  
 CAboutDlg dlg; q;No"_aAd  
 dlg.DoModal(); m{O Dz :  
} MYu`c[$jZ  
-)>(8f  
void CCaptureDlg::OnBrowse() '}CN?f|.  
{ 4v>o%  
 CString str; 1 yJ75/  
 BROWSEINFO bi; 8=pv/o  
 char name[MAX_PATH]; A$ J9U3+O  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); yWmrdvL  
 bi.hwndOwner=GetSafeHwnd(); 9BO|1{  
 bi.pszDisplayName=name; wA1Ey:q  
 bi.lpszTitle="Select folder"; 6+ ?wnp-  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Wt"ww~h`(  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); }pK v.  
 if(idl==NULL) Q!`)e@r  
  return; iel-<(~   
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); YQx?* gZS  
 str.ReleaseBuffer(); 1y~L8!: L  
 m_Path=str; %rw}u"3T  
 if(str.GetAt(str.GetLength()-1)!='\\') HM 90Sb  
  m_Path+="\\"; ~;!BDLMC6  
 UpdateData(FALSE); V07VwVD  
} @"0uM?_)-  
#)FDl70S8  
void CCaptureDlg::SaveBmp() 73VQ@J n  
{ Ej{+U  
 CDC dc; !. p  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); hAlPl<BO#V  
 CBitmap bm; m|lM.]2_  
 int Width=GetSystemMetrics(SM_CXSCREEN); ]  ~'9  
 int Height=GetSystemMetrics(SM_CYSCREEN); aU4R+.M7@  
 bm.CreateCompatibleBitmap(&dc,Width,Height); brj[c>ID  
 CDC tdc; aj?2jU~Pq  
 tdc.CreateCompatibleDC(&dc); 8<Xq=*J+  
 CBitmap*pOld=tdc.SelectObject(&bm); }a' cm!"  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); L,WkJe3  
 tdc.SelectObject(pOld); )O9fhj)  
 BITMAP btm; WqR7uiCi  
 bm.GetBitmap(&btm); el}hcAY/RP  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; X:U=MWc>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); tg3zXJ4k_  
 BITMAPINFOHEADER bih; [z^Od  
 bih.biBitCount=btm.bmBitsPixel; !ZX&r{pJp  
 bih.biClrImportant=0; #s*k| j}  
 bih.biClrUsed=0; }iMXXXBOT  
 bih.biCompression=0; El{r$-}  
 bih.biHeight=btm.bmHeight; *q}FV2  
 bih.biPlanes=1; iQu^|,tHEM  
 bih.biSize=sizeof(BITMAPINFOHEADER); ^u3*hl}YKy  
 bih.biSizeImage=size; 'frWu6]< 4  
 bih.biWidth=btm.bmWidth; ?vMK'"  
 bih.biXPelsPerMeter=0; /q T E  
 bih.biYPelsPerMeter=0; b-2pzcK{#  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); hr%U>U9F  
 static int filecount=0; xna7kA  
 CString name; ^)Smv\Md  
 name.Format("pict%04d.bmp",filecount++); 1>hb-OMX  
 name=m_Path+name; hH#lTye  
 BITMAPFILEHEADER bfh; JaA&eT|  
 bfh.bfReserved1=bfh.bfReserved2=0; `(P "u  
 bfh.bfType=((WORD)('M'<< 8)|'B'); W8< @sq~I  
 bfh.bfSize=54+size; .#"1bRWpZ  
 bfh.bfOffBits=54; w<Zdq}{jO  
 CFile bf; !X%S)VSMU  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ *3 !(*F@M,  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); X {#bJ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 7qpzk7X?pR  
  bf.WriteHuge(lpData,size); 9z+vFk`  
  bf.Close(); 0,:iE\  
  nCount++; JIVo=5c}  
 } +I*k0"gj6  
 GlobalFreePtr(lpData); h] <GTWj  
 if(nCount==1) _cR6ik zW(  
  m_Number.Format("%d picture captured.",nCount); eR7qE) h  
 else ?0 HR(N(z!  
  m_Number.Format("%d pictures captured.",nCount); P a3{Ds  
  UpdateData(FALSE); I+*osk  
} 0K&_D)  
e jP,29  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) >y]?MGk  
{ (qJIu  
 if(pMsg -> message == WM_KEYDOWN) 9*BoYFw92*  
 { pi|\0lH6W  
  if(pMsg -> wParam == VK_ESCAPE) t#a.}Jl  
   return TRUE; cZ6?P`X  
  if(pMsg -> wParam == VK_RETURN) b*cW<vX}~  
   return TRUE; :b.3CL\.6  
 } a:=q8Qy  
 return CDialog::PreTranslateMessage(pMsg); $[)6H7!U)  
} ThjUiuWe  
@mvIt  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zB;'_[8M  
{ joxS+P5#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Tnf&pu#5  
  SaveBmp(); MKV=m8G=  
  return FALSE; 2r %>]y  
} 9 aY'0wa  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 65'`uuPx  
 CMenu pop; Qk?jGXB>^  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); I).=v{@9V<  
 CMenu*pMenu=pop.GetSubMenu(0); &,^mM' C  
 pMenu->SetDefaultItem(ID_EXITICON); u wH)$Pl  
 CPoint pt; SL6mNn9c  
 GetCursorPos(&pt); Xq+!eOT  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); VEL:JsY  
 if(id==ID_EXITICON) eLCdAr  
  DeleteIcon(); =n> iQS  
 else if(id==ID_EXIT) 3X,]=f@_  
  OnCancel(); vEu Ka<5  
 return FALSE; xylpiSJ  
} Kl4isGcr]  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 7h(HG?2Y  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ) ~ l\  
 AddIcon(); VI(RT-S6  
 return res; >`<Ued  
} Mr$# e  
 aeEw#  
void CCaptureDlg::AddIcon() OG0r4^6Ly  
{ ^RYn8I  
 NOTIFYICONDATA data; lF0K=L  
 data.cbSize=sizeof(NOTIFYICONDATA); D."cQ<sxpN  
 CString tip; elN{7:  
 tip.LoadString(IDS_ICONTIP); 9 yh9HE  
 data.hIcon=GetIcon(0); N7d17c. 5  
 data.hWnd=GetSafeHwnd(); (J6" ;  
 strcpy(data.szTip,tip); "9c.CI  
 data.uCallbackMessage=IDM_SHELL; yTzY?  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; *rS9eej  
 data.uID=98; 6Hc H'nmeN  
 Shell_NotifyIcon(NIM_ADD,&data); H+S~ bzz  
 ShowWindow(SW_HIDE); l[tY,Y:4qO  
 bTray=TRUE; Dm7Y#)%8  
} \;nD)<)J  
6H(fk1E  
void CCaptureDlg::DeleteIcon() G> f^ 2  
{ <m?GJuQ'  
 NOTIFYICONDATA data; +P>Gy`D9  
 data.cbSize=sizeof(NOTIFYICONDATA); hB|H9+  
 data.hWnd=GetSafeHwnd(); F?*Dr  
 data.uID=98; h$E\2lsE  
 Shell_NotifyIcon(NIM_DELETE,&data); aK8bKlZe  
 ShowWindow(SW_SHOW); Mfnlue](  
 SetForegroundWindow(); OpWeW  
 ShowWindow(SW_SHOWNORMAL); J xA^DH  
 bTray=FALSE; UN cYu9[  
} xI=}z  
$sU5=,  
void CCaptureDlg::OnChange() _fczE~O/  
{ P5'iYahCq_  
 RegisterHotkey(); XkMs   
} i_j9/k  
b:N^Fe  
BOOL CCaptureDlg::RegisterHotkey() Ha46U6_'h  
{ J!21`M-Ue  
 UpdateData(); ovhC4 2i  
 UCHAR mask=0; Z7tU0  
 UCHAR key=0; .`oJcJ  
 if(m_bControl) b &\3ps  
  mask|=4; /#S4espE  
 if(m_bAlt) W&fW5af9  
  mask|=2; @4 zi]v  
 if(m_bShift) I-RdAVB/Ep  
  mask|=1; D6&mf2'u  
  key=Key_Table[m_Key.GetCurSel()]; FRl3\ZDqrb  
 if(bRegistered){ 'hwV   
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); U%mkhWn  
  bRegistered=FALSE; [}W^4,  
 } ?noETHz)  
 cMask=mask; y3 ({(URU  
 cKey=key; _hAj2%SL  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 0EL\Hd  
 return bRegistered; ({;P#qCX  
} 6vD]@AF  
QU-7Ch#8  
  四、小结 %NF<bEV  
w Mlf3Uz  
  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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