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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: `?+lM  
  I?}YS-2  
  一、实现方法 4loG$l+a1  
8XZS BR(Z  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: PzbLbH8A  
*^e06xc:  
#pragma data_seg("shareddata") pJ!:mt  
HHOOK hHook =NULL; //钩子句柄 0Ah'G  
UINT nHookCount =0; //挂接的程序数目 |dcRDOTe  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 FJDx80J  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 o{5es  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey [LDsn]{  
static int KeyCount =0; 7t &KKKV  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Hg(%g T  
#pragma data_seg() 0\*[7!`s  
8R<2I1xn2  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 .\K0+b;  
MwMv[];I  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ^}vLZA  
Q^}6GS$  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 9aky+  
cKey,UCHAR cMask) =oz$uD}?  
{ tfW*(oU  
 BOOL bAdded=FALSE; Loo48  
 for(int index=0;index<MAX_KEY;index++){ c `C /U7j  
  if(hCallWnd[index]==0){ j#mo Vq  
   hCallWnd[index]=hWnd; 7<;87t]]  
   HotKey[index]=cKey; N=R|s$,Oy9  
   HotKeyMask[index]=cMask; fgcI55&jV{  
   bAdded=TRUE; 3m:[o`L  
   KeyCount++; }{/3yXk[G  
   break; ;LSdY}*%0  
  } R+ #(\  
 } &o@IMbJ8  
 return bAdded; :%-xiv  
} F)rU* i7  
//删除热键 Nr 5h%<` I  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) d;1%Ei3K  
{ z2p@d1  
 BOOL bRemoved=FALSE; Al&)8x{p  
 for(int index=0;index<MAX_KEY;index++){ O]&DDzo  
  if(hCallWnd[index]==hWnd){ g*t(%;_m  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ kH:! 7L_=  
    hCallWnd[index]=NULL; F} d>pK9fn  
    HotKey[index]=0; VA{2a7]  
    HotKeyMask[index]=0; cYHHCaCS  
    bRemoved=TRUE; CJ0{>?  
    KeyCount--; + q@kRQY;n  
    break; 2w6 y  
   } ~Iw7Xq E2  
  } &+]x  
 } X;`XkOjk  
 return bRemoved; 7L68voC@U  
} >HMuh)  
,FWC|uM"  
AY3nQH   
  DLL中的钩子函数如下: R)4L]ZF  
B^Z %38o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3zi(|B[,?  
{ 1C) l) pV  
 BOOL bProcessed=FALSE; "W!Uxc  
 if(HC_ACTION==nCode) 2rK%fV53b  
 { 6%'bo`S#  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ]3UEju8$  
   switch(wParam) 6XU1w  
   {  qRy<W  
    case VK_MENU: T#&tf^;  
     MaskBits&=~ALTBIT; gG5@ KD6k  
     break; ~:8}Bz2!5  
    case VK_CONTROL: s az<NT  
     MaskBits&=~CTRLBIT; )y8 u+5^  
     break; 8)n799<.  
    case VK_SHIFT: !e+ex"7  
     MaskBits&=~SHIFTBIT; w#ha ^4  
     break; Ej |rf Y  
    default: //judge the key and send message PU| X+V>  
     break; `yiw<9yp2  
   } Cbw@:+%J{  
   for(int index=0;index<MAX_KEY;index++){ u17e  
    if(hCallWnd[index]==NULL) }\+7*|  
     continue; q0* e1QL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eAvOT$  
    { 6KT]3*B   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); B[2 qI7D$  
     bProcessed=TRUE; q o,uOi  
    } eRV4XB:  
   } cPQUR^!5  
  } ^Yu<fFn  
  else if((lParam&0xc000ffff)==1){ //有键按下 _G9 vsi  
   switch(wParam) oUXi 4lsSc  
   { ++b1VBP  
    case VK_MENU: +-8S,Rg@   
     MaskBits|=ALTBIT; T_T@0`7  
     break; !{hC99q6  
    case VK_CONTROL: |/Q7 o1i  
     MaskBits|=CTRLBIT; ~CTe5PX c  
     break; zB,Vi-)vH  
    case VK_SHIFT: V)HX+D>  
     MaskBits|=SHIFTBIT; P[E:=p  
     break; frsqnvm;+  
    default: //judge the key and send message j A/xe  
     break; TCb 7-s  
   } Z+# =]Kw)  
   for(int index=0;index<MAX_KEY;index++){ ^Bkwbj  
    if(hCallWnd[index]==NULL) `R\aNgCS}  
     continue; S(bYN[U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RZKdh}B?\  
    { h%2;B;p]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); A}./ ;[  
     bProcessed=TRUE; f9R~RRz  
    } |ATz<"q>  
   } WX2:c,%:  
  } 3}U {~l!K  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ?ks3K-.4  
   for(int index=0;index<MAX_KEY;index++){ @(k}q3b<  
    if(hCallWnd[index]==NULL) 2@&|/O6_\h  
     continue; RXo!K iQO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) j%7N\Vb  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); tXlo27J  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 1Z. D3@  
   } hT c VMc  
  } gmFCjs  
 } soSdlV{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /iz{NulOz*  
} PAYbsn  
D/& 8[Z/Cn  
  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: iR_j h=2{  
}@+3QHwYU  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N*vBu `  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '{e9Vh<x  
S!\4,6  
  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: ^T^l3B[  
:K-05$K  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }(*eRF'  
{ gd#j{yI/Xf  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) dp&8:jy  
 { 0[\^Y<ec  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 H]^hEQ3DT  
  SaveBmp(); k/U1 :9  
  return FALSE; WAd5,RZ?  
 } Ib8*rL0p<L  
 …… //其它处理及默认处理 aicvu(%EE  
} gL)l)}#  
MM+x}g.?  
2N)siH  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 Rw j4  
tWT ,U[  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 [ ;/4'  
SVJL|S 3k  
  二、编程步骤 O %x<  
> T$M0&<  
  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"; ^( w%m#  
5uo?KSX%  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; u ZzO$e  
FR bmeq3c  
  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; pJnT \~o  
NU]+ {7  
  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; "L?h@8sa  
o7_*#5rD  
  5、 添加代码,编译运行程序。 @ )bCh(u  
D90.z"N\i9  
三、程序代码 ~2HlAU))<&  
 BVJ6U[h`  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5mtsN#  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) D7X8yv1  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ &3@ {?K  
#if _MSC_VER > 1000 6}(; ~/L  
#pragma once nBN+.RB:(  
#endif // _MSC_VER > 1000 [osIQ!u;:  
#ifndef __AFXWIN_H__ JY5)^<.d  
#error include 'stdafx.h' before including this file for PCH ~!t#M2Sk  
#endif E~4d6~s  
#include "resource.h" // main symbols QsO%m  
class CHookApp : public CWinApp \/wbk`2  
{ C>}@"eK  
 public: Q+ i  
  CHookApp(); CXAW>VdK_  
  // Overrides uPbGQ:%}  
  // ClassWizard generated virtual function overrides <~d3L4h*<  
  //{{AFX_VIRTUAL(CHookApp) B IW?/^  
 public: y TbOBl  
  virtual BOOL InitInstance(); KxA ^?,t[  
  virtual int ExitInstance(); 5 R*  
  //}}AFX_VIRTUAL ?Q?=I,2bP  
  //{{AFX_MSG(CHookApp) oJ:\8>)9  
  // NOTE - the ClassWizard will add and remove member functions here. \ #yKCA';  
  // DO NOT EDIT what you see in these blocks of generated code ! =x &"aF1  
  //}}AFX_MSG {E 'go]  
  DECLARE_MESSAGE_MAP() hOOkf mOM  
}; \me'B {aa  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); y;GwMi $KI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g,k} nkIT  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); rDD,eNjG  
BOOL InitHotkey(); }ldOxJSB?  
BOOL UnInit(); ;2&ym)`  
#endif N=vb*3ECg  
4qYT  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. U8>M`e"D  
#include "stdafx.h" 'joc8o sS  
#include "hook.h" @5=2+ M  
#include <windowsx.h> ZUA%ZkX=F  
#ifdef _DEBUG WDF;`o*3  
#define new DEBUG_NEW ;ndwVZ~,  
#undef THIS_FILE 2F z;TNS  
static char THIS_FILE[] = __FILE__; MsD@pa  
#endif lTR/o  
#define MAX_KEY 100 tCVaRP8eC+  
#define CTRLBIT 0x04 f[XsnN2  
#define ALTBIT 0x02 e I^Q!b8n  
#define SHIFTBIT 0x01 aioN)V  
#pragma data_seg("shareddata")  BH<jnQ  
HHOOK hHook =NULL; ozCH1V{p  
UINT nHookCount =0; cns~)j~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey F7"v}K]X  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 9kO}054  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey vl"{ovoC  
static int KeyCount =0; ([#4H3uO-  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift p]]*H2UD  
#pragma data_seg() A8zh27[w%  
HINSTANCE hins; Vlf=gP  
void VerifyWindow(); us,~<e0  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) |eu:qn8  
//{{AFX_MSG_MAP(CHookApp) *a[iq`499  
// NOTE - the ClassWizard will add and remove mapping macros here. 8q"C=t7  
// DO NOT EDIT what you see in these blocks of generated code! te*|>NRS  
//}}AFX_MSG_MAP ,|7!/]0&  
END_MESSAGE_MAP() &OXWD]5$6  
G@(ukt`0}  
CHookApp::CHookApp() !A|ayYBb\  
{  %&81xAt  
 // TODO: add construction code here, 8 Buus  
 // Place all significant initialization in InitInstance `,7;2ZG~O  
} vNn$dc  
D|gI3i  
CHookApp theApp; g,O3\jjQ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) jTh^#Q  
{ g.:b\JE`  
 BOOL bProcessed=FALSE; kw$*o k  
 if(HC_ACTION==nCode) 9^zA(  
 { oScKL#Hu  
  if((lParam&0xc0000000)==0xc0000000){// Key up tB<2mjg  
   switch(wParam) v-MrurQ4  
   { d^:(-2l-  
    case VK_MENU: ?AlTQL~c  
     MaskBits&=~ALTBIT; )*m#RqLQ8  
     break; bpaS(nBy  
    case VK_CONTROL: 7,!$lT#  
     MaskBits&=~CTRLBIT; x3C^S~  
     break; |EpL~ G_  
    case VK_SHIFT: V.?Oly  
     MaskBits&=~SHIFTBIT; m`lxQik  
     break; :dML+R#Ymh  
    default: //judge the key and send message LEgx"H=c  
     break; na0-v-  
   } pN-c9n4#j  
   for(int index=0;index<MAX_KEY;index++){  x#hGJT  
    if(hCallWnd[index]==NULL) Y)](jU%o  
     continue; wQR0R~|M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rl0|)j  
    { N NTUl$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5n#@,V.O/  
     bProcessed=TRUE; a'prlXr\4  
    } (q+EP(Q  
   } `/+PZqdC  
  } ?c0@A*:o  
  else if((lParam&0xc000ffff)==1){ //Key down e"u89acp  
   switch(wParam) ,b!]gsds  
   { D/<;9hw  
    case VK_MENU: 47 |&(,{  
     MaskBits|=ALTBIT; eN Y?  
     break; cpJ(77e  
    case VK_CONTROL: H]a@"gO  
     MaskBits|=CTRLBIT; rD*CLq K  
     break; /)LI1\ o  
    case VK_SHIFT: r)/nx@x  
     MaskBits|=SHIFTBIT; IuOY.c2.u  
     break; q s 0'}>  
    default: //judge the key and send message m{ VC1BkZ  
     break; 9i`sSi8   
   } V.H<KyaJ  
   for(int index=0;index<MAX_KEY;index++) <`Q*I Y  
   { n^+rxG6 L  
    if(hCallWnd[index]==NULL) [ KT1.5M[  
     continue; _N2tf/C&=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -A3>+G3[  
    { W:TF8Onw  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); @`S8d%6P  
     bProcessed=TRUE; snccDuS  
    } #>[5NQ;$'  
   } !tckE\ h#N  
  } 1XD|H_JG<j  
  if(!bProcessed){ TxDzGC  
   for(int index=0;index<MAX_KEY;index++){ kE*OjywN  
    if(hCallWnd[index]==NULL) QmRE<i  
     continue; "U6:z M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +u[?8D7Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); qR>"r"Fq  
   } D8r=V f  
  } ??g`c=R!V  
 } hrZ=8SrW  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); se,0Rvkt  
} /4_^'RB  
Q ,6[  
BOOL InitHotkey() D$$,T.'u  
{ lWe1Q#  
 if(hHook!=NULL){ .C7;T'>!  
  nHookCount++; 25-5X3(>j=  
  return TRUE; |v?*}6:a  
 } pQ/ bIuq  
 else :f|X$> b  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 1}>uY  
  if(hHook!=NULL) { kF"<W  
   nHookCount++; #'2CST  
  return (hHook!=NULL); *]]C.t-cd  
} [bIR$c[G  
BOOL UnInit() ),#hBB`ZA  
{ wNt-mgir-Q  
 if(nHookCount>1){ IP e"9xb  
  nHookCount--; w\f>.N  
  return TRUE; wO&2S-;_K  
 } Gi*GFv%xB  
 BOOL unhooked = UnhookWindowsHookEx(hHook); zbM*/:Y  
 if(unhooked==TRUE){ H.R7,'9  
  nHookCount=0; 2B<0|EGtzw  
  hHook=NULL; qZ79IX'y  
 } sM0o,l(5  
 return unhooked; Y\pRk6,  
} ZZJXd+Q}  
MG6y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) SF#Rc>v  
{ zEu15!~   
 BOOL bAdded=FALSE; H*&ZX AKv  
 for(int index=0;index<MAX_KEY;index++){ cHO8%xu`  
  if(hCallWnd[index]==0){ Er]lObfQo  
   hCallWnd[index]=hWnd; ?*ni5\y5o  
   HotKey[index]=cKey; {#Vck\&  
   HotKeyMask[index]=cMask; b}OOG  
   bAdded=TRUE; $*Z Zh  
   KeyCount++; ygz6 ~(  
   break; n$S`NNO{]  
  } 83ajok4E  
 } lxvRF93a.  
 return bAdded; y?1<7>L5~  
} EE<^q?[3^  
3>I   
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ZO!  
{ l*+5WrOS  
 BOOL bRemoved=FALSE; |y*-)t  
 for(int index=0;index<MAX_KEY;index++){ ,@b7N[h  
  if(hCallWnd[index]==hWnd){ 8!c#XMHV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ nfV32D|3  
    hCallWnd[index]=NULL; `Rc7*2I)l  
    HotKey[index]=0; m@_m"1_;  
    HotKeyMask[index]=0; dT9ekNQB  
    bRemoved=TRUE; ~SW_jiKM  
    KeyCount--; +-B`Fya  
    break; SB3= 5"q  
   } rq.S0bzH  
  } 22<T.c  
 } XazKS4(  
 return bRemoved; 27NhYDo  
} jr9/  
d5x>kO'[l  
void VerifyWindow() 08!pLE  
{ )38M~/ ^l  
 for(int i=0;i<MAX_KEY;i++){ FrXh\4C  
  if(hCallWnd!=NULL){ aB(6yBBoxj  
   if(!IsWindow(hCallWnd)){ [AZN a  
    hCallWnd=NULL; 0H6^2T<  
    HotKey=0; 1{.=T&eG#  
    HotKeyMask=0; mu1Lgs$;  
    KeyCount--; 8>}^W  
   } s] X]jfA.  
  } =eXJZPR  
 } ( _{\tgSm  
} r95l.v  
"^~>aVuXf  
BOOL CHookApp::InitInstance() 7D;g\{>M  
{ :.+?v*%;n  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); aFj)s?$4]K  
 hins=AfxGetInstanceHandle(); BK_x5mGu3  
 InitHotkey(); +Y^_1  
 return CWinApp::InitInstance(); #h 4`f  
} '~1uJ0H  
vIoV(rc+  
int CHookApp::ExitInstance() {iv!A=jld  
{ _Vs\:tygs  
 VerifyWindow(); zLs[vg.(  
 UnInit(); U*Hw t\  
 return CWinApp::ExitInstance(); tsFwFB*  
} #NAlje(7  
(]Z$mv!  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file amL8yb  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) z k[%YG&  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !~{AF|2f  
#if _MSC_VER > 1000 ]Y3|*t(\  
#pragma once WheJ 7~  
#endif // _MSC_VER > 1000 ?Afx{H7  
Lmy ^/P%  
class CCaptureDlg : public CDialog w/KCu W<  
{ %C]K`=vI-  
 // Construction 0Wf,SYx`s  
 public: {-sy,EYcw  
  BOOL bTray; HS|X//]  
  BOOL bRegistered; ;P-xKRU!Xx  
  BOOL RegisterHotkey(); o,!r t1&0  
  UCHAR cKey; <uugT9By  
  UCHAR cMask; M'=27!D^  
  void DeleteIcon();  H4HWr6  
  void AddIcon(); .TN9N  
  UINT nCount; 5-L?JD 4&  
  void SaveBmp(); oEHUb?(p  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Z#wmEc.}C  
  // Dialog Data '"H'#%RU  
  //{{AFX_DATA(CCaptureDlg) MorR&K  
  enum { IDD = IDD_CAPTURE_DIALOG }; !s;+6Sy  
  CComboBox m_Key; cS98%@DR  
  BOOL m_bControl; G[YbgG=9Y  
  BOOL m_bAlt; 4#?Ox vH  
  BOOL m_bShift; mAk@Q|u  
  CString m_Path; I$4GM  
  CString m_Number; jXO*_R  
  //}}AFX_DATA y ?FKou'  
  // ClassWizard generated virtual function overrides [@OXvdTV  
  //{{AFX_VIRTUAL(CCaptureDlg) 2\ /(!n  
 public: bJD2c\qoc  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ]3_oT^$:  
 protected: Kc=&jCn  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }LNpr  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); L Ty [)  
  //}}AFX_VIRTUAL &|7pu=  
  // Implementation )1a3W7  
 protected: Oo<^~d2=  
  HICON m_hIcon; y< hIXC  
  // Generated message map functions zrjqB3R4@O  
  //{{AFX_MSG(CCaptureDlg) ;T!mNKl  
  virtual BOOL OnInitDialog(); %+iJpRK)7  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); sgDlT=c'  
  afx_msg void OnPaint(); ^tIi;7k  
  afx_msg HCURSOR OnQueryDragIcon(); "E;]?s9x  
  virtual void OnCancel(); j_E$C.XU{g  
  afx_msg void OnAbout(); T<\Q4Coth  
  afx_msg void OnBrowse(); 2G8f4vsC[  
  afx_msg void OnChange(); o$>A;<  
 //}}AFX_MSG }O<u  
 DECLARE_MESSAGE_MAP() V.kU FTCvf  
}; ![Z'jC py  
#endif =<I90j~)  
qZlb?b"  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file l6.z-Qw  
#include "stdafx.h" NAjK0]SRY  
#include "Capture.h" 4r!8_$fN?G  
#include "CaptureDlg.h" ]3<k>?  
#include <windowsx.h> =$UDa`}D  
#pragma comment(lib,"hook.lib") h_4o4#  
#ifdef _DEBUG <">tB"="b  
#define new DEBUG_NEW k9`Bi`wp  
#undef THIS_FILE '{j.5~4y  
static char THIS_FILE[] = __FILE__; z#*w Na&@[  
#endif fr8:L!9  
#define IDM_SHELL WM_USER+1 MoN;t;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bZk7)b;1o  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RSG\3(  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; az~4sx$+}  
class CAboutDlg : public CDialog XM$r,}B k  
{ k 41lw^Jh  
 public: vW`{BWd  
  CAboutDlg(); [1@ -F+  
  // Dialog Data /GNLZm^  
  //{{AFX_DATA(CAboutDlg) <;:M:{RZY  
  enum { IDD = IDD_ABOUTBOX };  :\1:n  
  //}}AFX_DATA 0t<]Uf  
  // ClassWizard generated virtual function overrides +]/_gz  
  //{{AFX_VIRTUAL(CAboutDlg) 5An| #^]  
 protected: MzRURH,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2~+_T  
  //}}AFX_VIRTUAL |?0Cm|?  
  // Implementation A,rgN;5fb  
 protected: 2-i>ymoOS  
  //{{AFX_MSG(CAboutDlg) b(dIl)Y4 :  
  //}}AFX_MSG uYAPGs#k  
  DECLARE_MESSAGE_MAP() O:3pp8  
}; Z[ }0K3,5  
S+A'\{f  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) QD%~ A0  
{ #L.fGTb  
 //{{AFX_DATA_INIT(CAboutDlg) %zQME6WELz  
 //}}AFX_DATA_INIT MK 7S*N1  
} 't \:@-tQ  
,9gyHQ~  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Fxy-_%a  
{ g5/%}8[- 2  
 CDialog::DoDataExchange(pDX); |*"uj  
 //{{AFX_DATA_MAP(CAboutDlg) ?y!0QAIXK  
 //}}AFX_DATA_MAP Q@hx +aM  
} #P$=P2o  
a9qB8/Gg[  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) uBw1Xud[YI  
 //{{AFX_MSG_MAP(CAboutDlg) YbF}(iM  
 // No message handlers ~sk;6e)(2  
 //}}AFX_MSG_MAP GQoaBO.  
END_MESSAGE_MAP() Fku9hB  
9:CJl6~N)#  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) |i5A F\w  
: CDialog(CCaptureDlg::IDD, pParent) nC^?6il  
{ 2>0[^ .;"  
 //{{AFX_DATA_INIT(CCaptureDlg) _, /m  
  m_bControl = FALSE; /o#!9H   
  m_bAlt = FALSE; P 0,) Gw  
  m_bShift = FALSE; 8SK}#44Xz  
  m_Path = _T("c:\\"); 0\O*\w?  
  m_Number = _T("0 picture captured."); 6*Jd8Bva\o  
  nCount=0; >l{<p(  
  bRegistered=FALSE; utKtxLX"  
  bTray=FALSE; 'x BBQP  
 //}}AFX_DATA_INIT {`BC$V  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9'C kV[  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); D`PnY&ffT  
} EAp6IhW{  
:\x53-&hO4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ;LNFPo   
{ Ath^UKO"  
 CDialog::DoDataExchange(pDX); T1c2J,+}R  
 //{{AFX_DATA_MAP(CCaptureDlg) mw";l$Aq}  
  DDX_Control(pDX, IDC_KEY, m_Key); [_Y\TdR  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Urur/_]-%  
  DDX_Check(pDX, IDC_ALT, m_bAlt); J:Uf}!D  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); T (]  
  DDX_Text(pDX, IDC_PATH, m_Path); "knSc0 ,u  
  DDX_Text(pDX, IDC_NUMBER, m_Number); W+V#z8K  
 //}}AFX_DATA_MAP Q[`J=  
} /~V .qisZ  
<@ D`16%&  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 'm9f:iTr  
//{{AFX_MSG_MAP(CCaptureDlg) LGZ5py=xb  
 ON_WM_SYSCOMMAND() 6b4Kcl<i  
 ON_WM_PAINT() B) J.(k`p  
 ON_WM_QUERYDRAGICON() |ZW%+AQ|  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) /`#sp  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) =XsdR?C  
 ON_BN_CLICKED(ID_CHANGE, OnChange) m{Jo'*%8f  
//}}AFX_MSG_MAP Lzu;"#pw  
END_MESSAGE_MAP() od!"?F  
|\"vHt?@G  
BOOL CCaptureDlg::OnInitDialog() _;",7bT80  
{ zd AqGQfc  
 CDialog::OnInitDialog(); #=UEx  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); W@v@|D@  
 ASSERT(IDM_ABOUTBOX < 0xF000); 4thLK8/c5g  
 CMenu* pSysMenu = GetSystemMenu(FALSE); q3Re F_  
 if (pSysMenu != NULL) uhvmh  
 { N r5 aU6]  
  CString strAboutMenu; eYBo*  
  strAboutMenu.LoadString(IDS_ABOUTBOX); [RG&1~  
  if (!strAboutMenu.IsEmpty()) [,)yc/{*  
  { De,4r(5  
   pSysMenu->AppendMenu(MF_SEPARATOR); @=q,,t$r  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); e|u|b  
  } b}4k-hZL  
 }  Hi#'h  
 SetIcon(m_hIcon, TRUE); // Set big icon 2GQ q(_  
 SetIcon(m_hIcon, FALSE); // Set small icon VQF!|*#  
 m_Key.SetCurSel(0); NKB,D$!~&  
 RegisterHotkey(); Vc|r(lM  
 CMenu* pMenu=GetSystemMenu(FALSE); \)859x&(  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); n-[J+DdB  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND);  uZ][#[u  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); GCCmUR9d  
 return TRUE; // return TRUE unless you set the focus to a control b{qeu$G R  
} g=.~_&O  
'gd3 w~  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) R[ p. )F7  
{ itb0dF1G  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) MJ'|$b}  
 { -]"=b\Q  
  CAboutDlg dlgAbout; aZ^P*|_K3  
  dlgAbout.DoModal(); K}ACZT)Wp  
 } Dv?'(.z  
 else jV)!9+H#  
 { B~oSKM%8R  
  CDialog::OnSysCommand(nID, lParam); `"QUA G  
 } g{w IdV  
} (v(!l=3  
gv$6\1  
void CCaptureDlg::OnPaint() z!27#gbL  
{ Gs%IZo_  
 if (IsIconic()) 1><\3+8  
 { j(/Bf m  
  CPaintDC dc(this); // device context for painting G%~=hEK0  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); .kh%66:  
  // Center icon in client rectangle B$qmXA)ze  
  int cxIcon = GetSystemMetrics(SM_CXICON); 5g  ,u\`  
  int cyIcon = GetSystemMetrics(SM_CYICON);  {n}6  
  CRect rect; +%(iGI{  
  GetClientRect(&rect); c7T9kV 8hS  
  int x = (rect.Width() - cxIcon + 1) / 2; Gb+cT  
  int y = (rect.Height() - cyIcon + 1) / 2; %J4]T35^2  
  // Draw the icon \ &1)k/  
  dc.DrawIcon(x, y, m_hIcon); [z#C&gDt  
 } vr5 6 f1  
 else JG&`l{c9  
 { *u.6,jw  
  CDialog::OnPaint(); A3ad9?LR[R  
 } H6?ZE  
} 7cin?Z1  
Vr/UbgucJ  
HCURSOR CCaptureDlg::OnQueryDragIcon() JPL8fX-w  
{ lQQXV5NV  
 return (HCURSOR) m_hIcon; x bF*4;^SI  
} ;;'b;,/  
f%9EZ+OP  
void CCaptureDlg::OnCancel() 8>a/x,  
{ {Pm^G^EP  
 if(bTray) ?l#9ydi?  
  DeleteIcon(); rm2"pfs  
  CDialog::OnCancel(); 3U=q3{%1  
} [Z6]$$!#2  
@!6eRp>Z  
void CCaptureDlg::OnAbout() c 2j?<F1  
{ L(Q v78F  
 CAboutDlg dlg; d{+ H|$L`  
 dlg.DoModal(); <$Q\vCR  
} 4S|! iOY  
])h={gI  
void CCaptureDlg::OnBrowse() 0 z{S@  
{ n m(yFX?=  
 CString str; f" Yj'`6  
 BROWSEINFO bi; +:1ay^YI  
 char name[MAX_PATH]; pgz3d{]ua  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Y'"2s~_ Z  
 bi.hwndOwner=GetSafeHwnd(); h-hU=I8  
 bi.pszDisplayName=name; hKjvD.6]%  
 bi.lpszTitle="Select folder"; 6'ye-}vD-  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; WmLl.Vv=  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); awuUaE  
 if(idl==NULL) Z y@35;r  
  return; ; iQ@wOL]  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); {LTb-CB  
 str.ReleaseBuffer(); Qfo'w%px  
 m_Path=str; H4 Y7p  
 if(str.GetAt(str.GetLength()-1)!='\\') :Bp{yUgi@  
  m_Path+="\\"; M`\c'|i/  
 UpdateData(FALSE); '"QC^Joz  
} >U~.I2sz  
"{;]T  
void CCaptureDlg::SaveBmp() AWC zu5ve  
{ ^T"9ZBkb  
 CDC dc; uHBX}WH  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); t+Mr1e  
 CBitmap bm; b6_*ljM  
 int Width=GetSystemMetrics(SM_CXSCREEN); ncJ}h\:Sk  
 int Height=GetSystemMetrics(SM_CYSCREEN); AC3K*)`E  
 bm.CreateCompatibleBitmap(&dc,Width,Height); (u85$_C  
 CDC tdc; K1uN(T.Ju  
 tdc.CreateCompatibleDC(&dc); 6,M>'s,N  
 CBitmap*pOld=tdc.SelectObject(&bm); ==(9P`\  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 7|PpAvMF  
 tdc.SelectObject(pOld); #G{}Rd|!  
 BITMAP btm; gVCkj!{  
 bm.GetBitmap(&btm); ||hy+f[A  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; D2|-\vJ>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 'GQ1;9A57  
 BITMAPINFOHEADER bih; /tA$ 'tZ  
 bih.biBitCount=btm.bmBitsPixel; M]!\X6<_  
 bih.biClrImportant=0; w<j6ln+nM  
 bih.biClrUsed=0; ;+K:^*oJ  
 bih.biCompression=0; kac@yQD  
 bih.biHeight=btm.bmHeight; 6}R^L(^M  
 bih.biPlanes=1; vrn I Eur  
 bih.biSize=sizeof(BITMAPINFOHEADER); TveCy&  
 bih.biSizeImage=size; H? N!F7s  
 bih.biWidth=btm.bmWidth; ]7zDdI|  
 bih.biXPelsPerMeter=0; &q1(v3cOO  
 bih.biYPelsPerMeter=0; },0fPkVsU  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ]g3&gw  
 static int filecount=0; {>OuxVl??k  
 CString name; 7M}T^LC  
 name.Format("pict%04d.bmp",filecount++); (rFY8oHD  
 name=m_Path+name; CU6rw+Vax  
 BITMAPFILEHEADER bfh; 2N)=fBF%-  
 bfh.bfReserved1=bfh.bfReserved2=0; qfE/,L(B  
 bfh.bfType=((WORD)('M'<< 8)|'B'); %^^2  
 bfh.bfSize=54+size; ZA>hN3fE'  
 bfh.bfOffBits=54; "m})~va  
 CFile bf; y% uUA]c*m  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 0 sVCTJ@  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #QZg{  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); aGNt?)8WPZ  
  bf.WriteHuge(lpData,size); #^<7VS!x  
  bf.Close(); eJE?H]  
  nCount++; /fA:Fnv  
 } 9cFFQM|o  
 GlobalFreePtr(lpData); kJy<vb~   
 if(nCount==1) 4 *He<2g  
  m_Number.Format("%d picture captured.",nCount); Bcrd}'no  
 else N:0/8jmmO  
  m_Number.Format("%d pictures captured.",nCount); 3nd02:GF  
  UpdateData(FALSE); {#uX   
} TuwH?{ FzK  
Ts:dnGR5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 0KnlomuH2  
{ :::"C"Ge  
 if(pMsg -> message == WM_KEYDOWN) p}uL%:Vr  
 { !OPK?7   
  if(pMsg -> wParam == VK_ESCAPE) P\iw[m7O  
   return TRUE; ~t<BZu  
  if(pMsg -> wParam == VK_RETURN) 2{"Wa|o`  
   return TRUE; Cv{rd##Y8  
 } CcgCKT  
 return CDialog::PreTranslateMessage(pMsg); y2\, L  
} gO<>L0,j  
P_hwa1~d  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {\`#,[  
{ o?$D09j;;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ PLg`\|  
  SaveBmp(); PPDm*,T.  
  return FALSE; Mh>^~;  
} 93)&  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Cf<i"   
 CMenu pop; 3 _:yHwkD  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); qQ/j+  
 CMenu*pMenu=pop.GetSubMenu(0); >8t3a-/  
 pMenu->SetDefaultItem(ID_EXITICON); ED[PP2[/  
 CPoint pt; 5Tb93Q@c  
 GetCursorPos(&pt); cc.z C3Hs3  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); z^{VqC*o+  
 if(id==ID_EXITICON) 3tS~/o+]  
  DeleteIcon(); Th`IpxV  
 else if(id==ID_EXIT) CO0Nq/@  
  OnCancel(); (Pin9^`ALc  
 return FALSE; fph*|T&R  
} +aEE(u6%E@  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); xO'1|b^&  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) KxGK`'E'r  
 AddIcon(); f`RcfYt  
 return res; '2/48j X5  
} u <%,Ql  
_Wk!d3bsx  
void CCaptureDlg::AddIcon() {#zJx(2yG  
{ Kv{i_%j   
 NOTIFYICONDATA data; jToA"udW/  
 data.cbSize=sizeof(NOTIFYICONDATA); (lwkg8WC  
 CString tip; qdL;Ii<Y0  
 tip.LoadString(IDS_ICONTIP); }Wn6r_:  
 data.hIcon=GetIcon(0); ?#rDoYt/Sx  
 data.hWnd=GetSafeHwnd(); $wdIOfaH  
 strcpy(data.szTip,tip); :a0qm.EN  
 data.uCallbackMessage=IDM_SHELL; hCc_+/j|  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; CcLP/  
 data.uID=98; Y2yVl+  
 Shell_NotifyIcon(NIM_ADD,&data); ts{Tk5+  
 ShowWindow(SW_HIDE); tl CgW)<?  
 bTray=TRUE; fN?HF'7V  
} y_Bmd   
g(,gg1mG  
void CCaptureDlg::DeleteIcon() ljlQ9wb[s  
{ nr! kx)j  
 NOTIFYICONDATA data; G3OqRH  
 data.cbSize=sizeof(NOTIFYICONDATA); 7 H.2]X  
 data.hWnd=GetSafeHwnd(); 0{@E=}}h  
 data.uID=98; Hp8)-eT  
 Shell_NotifyIcon(NIM_DELETE,&data); SE;Jl[PgcL  
 ShowWindow(SW_SHOW); Z[FSy-;"  
 SetForegroundWindow(); 3O:Z;YP:<  
 ShowWindow(SW_SHOWNORMAL); s0E:hn:  
 bTray=FALSE; &xj?MgdNL  
} ZxwI< T:&  
^ bexXYh  
void CCaptureDlg::OnChange() !n}"D:L(  
{ Qg%B<3 <  
 RegisterHotkey(); 'eLO#1Ipf  
} wg<DV!GZ  
H`9E_[  
BOOL CCaptureDlg::RegisterHotkey() Wepa;  
{ E/Q[J.$o  
 UpdateData(); z$QYl*F1  
 UCHAR mask=0; #:v|/2   
 UCHAR key=0; w=rh@S]  
 if(m_bControl) =CFO]9  
  mask|=4; eXc`"T,C.  
 if(m_bAlt) <omSK- T-  
  mask|=2; *A@~!@XE4  
 if(m_bShift) bvUjH5.7  
  mask|=1; GghZ".O  
  key=Key_Table[m_Key.GetCurSel()]; v<ASkkh>  
 if(bRegistered){ DKPX_::  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); O< v0{z09*  
  bRegistered=FALSE; l7ZqkGG]  
 } ]KA|};>ow  
 cMask=mask; ^$FHI_  
 cKey=key; AcwLs%'sx  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); f2`[skNj  
 return bRegistered; dli?/U@hO  
} Ww{bh -nyq  
,?3r-bM  
  四、小结 7s4G|N[wR\  
?rKewdGY  
  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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