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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: 1c]GS&(RP  
  ;e+ErN`a.~  
  一、实现方法 *cf#:5Nl  
`,J\E<4J  
  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: SJ<nAX  
?Pa5skqR  
#pragma data_seg("shareddata") 2vynz,^ET  
HHOOK hHook =NULL; //钩子句柄 )gZ yW  
UINT nHookCount =0; //挂接的程序数目 uKK+V6}!kj  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 `On%1%k8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ]`LMy t0  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey YM-,L-HMA  
static int KeyCount =0;  W+e  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 <%! EI@N  
#pragma data_seg() "lB[IB)  
'Je;3"@  
  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。 rAgb<D@,H  
5~v({R.  
  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: k/>k&^?  
L:7%Wdyh  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR L+&$/1h]  
cKey,UCHAR cMask) f mf(5  
{ />H9T[3=  
 BOOL bAdded=FALSE; ol-U%J  
 for(int index=0;index<MAX_KEY;index++){ _qr?v=,-A  
  if(hCallWnd[index]==0){ 'bTtdFvJ  
   hCallWnd[index]=hWnd; (m13 ong  
   HotKey[index]=cKey; dj 4:r!5_  
   HotKeyMask[index]=cMask; 5LR k)@t  
   bAdded=TRUE; u{J$]%C   
   KeyCount++; W2'u]1bs  
   break; f-^JI*hj  
  } S/V%<<[>p]  
 } 5 y0 N }}  
 return bAdded; RGsgT^  
} tw,uV)xm  
//删除热键 zt6GJ z1q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) xcty  
{ ) vn {?Ulj  
 BOOL bRemoved=FALSE; G8}k9?26(  
 for(int index=0;index<MAX_KEY;index++){ 0.+MlyA  
  if(hCallWnd[index]==hWnd){ @cukoLAn  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ "\3C)Nz?  
    hCallWnd[index]=NULL; 6o6I]QL  
    HotKey[index]=0; 1aDx 6Mq  
    HotKeyMask[index]=0; s+DOr$\  
    bRemoved=TRUE; VX0}x+LJ  
    KeyCount--; DZ"'GQSg  
    break; #A\@)wJ  
   } Xh+;$2l.B  
  } a]]eQ(xQ  
 } f?W_/daP  
 return bRemoved; 9eBD)tnw  
} [>![ViX  
E6XDn`:  
zcGmru|k  
  DLL中的钩子函数如下: H\RejGR  
jl9hFubwW  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5If.[j{  
{ ?.Q$@Ih0  
 BOOL bProcessed=FALSE; T5|e\<l  
 if(HC_ACTION==nCode) MQ#k`b#()  
 { z.lIlp2:  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ,Wv+Ek  
   switch(wParam) }k;wSp[3  
   {  C cPOK2  
    case VK_MENU: jh(T?t$&  
     MaskBits&=~ALTBIT; f*}}Az.4  
     break; 1%ENgb:8  
    case VK_CONTROL: L>LIN 1A  
     MaskBits&=~CTRLBIT; Fs"i fn0  
     break; ^hNl6)hR  
    case VK_SHIFT: MX? *jYl  
     MaskBits&=~SHIFTBIT; .+A)^A  
     break; _AzI\8m  
    default: //judge the key and send message Me79:+d  
     break; >dx/k)~~-L  
   } tq}MzKI*  
   for(int index=0;index<MAX_KEY;index++){ <2N{oK.  
    if(hCallWnd[index]==NULL) {7jl) x3l  
     continue; zZ6m`]{B9?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :{+~i.*  
    { %_."JT$v{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); OClG dFJ|  
     bProcessed=TRUE; :_}xN!9LA  
    } _K}q%In  
   } _3(rwD  
  } fV@ [S  
  else if((lParam&0xc000ffff)==1){ //有键按下 9#TD1B/  
   switch(wParam) Q3Pu<j}Y  
   { vJxE F&X  
    case VK_MENU: 3Q'vVNFh<  
     MaskBits|=ALTBIT; l`.z^+!8@  
     break; ?5FlbiT  
    case VK_CONTROL: LaO8)lqR  
     MaskBits|=CTRLBIT; SIapY%)h  
     break; "\i H/  
    case VK_SHIFT: ( +Sv3h  
     MaskBits|=SHIFTBIT; ?z`={oN  
     break; ynv{ rMl  
    default: //judge the key and send message )X-'Q-  
     break; ,A'| Z  
   } "MU-&**  
   for(int index=0;index<MAX_KEY;index++){ (?m{G Q  
    if(hCallWnd[index]==NULL) -w*fS,O  
     continue; <3!Al,!ej@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6#7hMQ0&;O  
    { HdN5zl,q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); o3V\   
     bProcessed=TRUE; bn )1G$0|  
    } G&xtL  
   } $m;`O_-T  
  } Xf_#O'z  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 t5%cpkgh4  
   for(int index=0;index<MAX_KEY;index++){ +l^tT&s;f  
    if(hCallWnd[index]==NULL) ffG<hclk  
     continue; +@=V}IO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) u8T@W}FX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); P&sWn?q Ol  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 pd:7K'yaw  
   } QuqznYSY{  
  } OL>)SJj5  
 } ydyTDn  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); a;t}'GQGk  
} & y5"0mA  
RI@\cJ\}  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: o>_})WM1[  
Sp492W+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ka~_iUU4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (B>/LsTu  
>*RU:X  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: K_;vqi^1^&  
S7)qq  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) SK lvZ  
{ 4d`YZNvZW/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) B~w$j/sWU  
 { iqvLu{  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 *[{j'7*cc  
  SaveBmp(); 9a=Ll]=\  
  return FALSE; nd]SI;<  
 } aOH|[  
 …… //其它处理及默认处理 l)9IgJ|<b  
} ^FKiVKI:  
RNi%6A1  
zbmC? 2$  
  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。 r }lGcG)  
eAfi!!Z<  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 @ j^R+F  
x="Wqcnj{  
  二、编程步骤 =p8uP5H  
tw_o?9  
  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"; r,Uk)xa/^  
!&{rnK  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ZeP=}0TGjn  
m+0yf(w  
  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; o]4]fLQ  
YIg(^>sq  
  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; }T@=I&g;  
+nE>)ZH  
  5、 添加代码,编译运行程序。 nF@**,C Q  
OP`f[lCiL  
三、程序代码 j6GIB_  
J,F1Xmr4  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ?H=q!i  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 8:$h&aBI  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Nap[=[rv  
#if _MSC_VER > 1000 sp,-JZD  
#pragma once r[S(VPo[()  
#endif // _MSC_VER > 1000 CRK%^3g  
#ifndef __AFXWIN_H__ 9MMCWMV  
#error include 'stdafx.h' before including this file for PCH 2!{D~Gfl=  
#endif yp#!$+a}  
#include "resource.h" // main symbols AJ\&>6GZ(b  
class CHookApp : public CWinApp g'7E6n"!,  
{ Dh8ECy5k<*  
 public: Sc7 Ftb%  
  CHookApp(); N&HI)X2&  
  // Overrides QQrldc(I  
  // ClassWizard generated virtual function overrides 7*l$ i/!  
  //{{AFX_VIRTUAL(CHookApp) xDo0bR(  
 public: i g(O$y  
  virtual BOOL InitInstance(); $Zu?Gd?  
  virtual int ExitInstance(); F\m^slsu7=  
  //}}AFX_VIRTUAL .d<K`.O ;  
  //{{AFX_MSG(CHookApp) [Fl_R[o  
  // NOTE - the ClassWizard will add and remove member functions here. .nPOjwEx&Y  
  // DO NOT EDIT what you see in these blocks of generated code ! j'D%eQI,V  
  //}}AFX_MSG ?9`j1[0  
  DECLARE_MESSAGE_MAP() w:5?ofC  
}; ON,[!pc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); k+J%o%* <  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `D4Wg<,9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W_W!v&@E=  
BOOL InitHotkey(); Tqt-zX|>  
BOOL UnInit(); danPy2  
#endif ?()*"+N(ck  
B[N]=V  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. M~A# _%2U  
#include "stdafx.h" q`9.@u@a  
#include "hook.h" -8 uS#  
#include <windowsx.h> " `qk}n-  
#ifdef _DEBUG |p:4s"NT  
#define new DEBUG_NEW )ros-d p`  
#undef THIS_FILE ,Kv6!ib6Q  
static char THIS_FILE[] = __FILE__; Uu_qy(4  
#endif p*Z<DEh#  
#define MAX_KEY 100 `NIb? /!f  
#define CTRLBIT 0x04 2 R\K!e  
#define ALTBIT 0x02 2P"643tz  
#define SHIFTBIT 0x01 UD-+BUV  
#pragma data_seg("shareddata") r8EJ@pOF2w  
HHOOK hHook =NULL; Jh-yIk  
UINT nHookCount =0; C m:AU;  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ~O}r<PQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT hIV9.{J  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Ca~8cQ  
static int KeyCount =0; Wd'}YbC  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 7h\is  
#pragma data_seg() \@@G\\)er  
HINSTANCE hins; {8m&Z36E  
void VerifyWindow(); \rr"EAk]  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) hk?i0#7W  
//{{AFX_MSG_MAP(CHookApp) `y>m >j  
// NOTE - the ClassWizard will add and remove mapping macros here. .#&)%}GC  
// DO NOT EDIT what you see in these blocks of generated code! hi(b\ ABx  
//}}AFX_MSG_MAP q /JC\  
END_MESSAGE_MAP() TCp9C1Q4  
Fl)nmwO c  
CHookApp::CHookApp() /4;mjE  
{ <V^o.4mOg>  
 // TODO: add construction code here, zZMKgFR@  
 // Place all significant initialization in InitInstance RvR.t"8  
} 2hHRitt36  
g:!U,<C^a  
CHookApp theApp; Fg`<uW]TFZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) T6/P54S  
{ ew\:&"@2]w  
 BOOL bProcessed=FALSE; -|V#U`mwF  
 if(HC_ACTION==nCode) #ft9ms#N  
 { |sGJum&=  
  if((lParam&0xc0000000)==0xc0000000){// Key up .i;.5)shsu  
   switch(wParam) fq>{5ODO  
   { "~VKUvDu  
    case VK_MENU: `+Nv =vk  
     MaskBits&=~ALTBIT; + E{[j  
     break; >~,~X9   
    case VK_CONTROL: F > rr.  
     MaskBits&=~CTRLBIT; a<-aE4wdm  
     break; ? l~qb]._  
    case VK_SHIFT: >,,`7%Rv  
     MaskBits&=~SHIFTBIT; 7)U ik}0  
     break; p-j6H  
    default: //judge the key and send message Jj)J5 S /  
     break; E]Mx<7;\.  
   } ,|*Gr"Q=  
   for(int index=0;index<MAX_KEY;index++){ Tv#d>ZSD  
    if(hCallWnd[index]==NULL) l$5nv5r  
     continue; *$O5.`]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |dxWO  
    { 6D| F1UFU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &Sg]P  
     bProcessed=TRUE; 29=ob("  
    } f I%8@ :  
   } Gd|kAC g  
  } '9QEG/v  
  else if((lParam&0xc000ffff)==1){ //Key down R?1Z[N  
   switch(wParam) .$s']' =  
   { fTpG>*{p  
    case VK_MENU: )&E]   
     MaskBits|=ALTBIT; F;_c x  
     break; a( ~X  
    case VK_CONTROL: 8GBKFNR 8  
     MaskBits|=CTRLBIT; KC"S0 6  
     break; l[~$9C'ji  
    case VK_SHIFT: Zb_A(mnzh  
     MaskBits|=SHIFTBIT; gdCit-3  
     break; jW7ffb `O  
    default: //judge the key and send message }J?,?>Z  
     break; CA|l| t^  
   } aA$\iFYA  
   for(int index=0;index<MAX_KEY;index++) 9Tr ceL;  
   { `}`Qqv  
    if(hCallWnd[index]==NULL) FI:H/e5[  
     continue; 4IW fp&Q!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eV%{XR?y  
    { onmpMU7w  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -'O|D}  
     bProcessed=TRUE; [*u\S  
    } &~;M16XM,e  
   } q{V e%8$"  
  } &KBDrJEX  
  if(!bProcessed){ &_]G0~e  
   for(int index=0;index<MAX_KEY;index++){ 8D>5(Dg-  
    if(hCallWnd[index]==NULL) %AJ9fs4/  
     continue; ` Ft-1eE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) WI&A+1CK-5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;ZuHv {=  
   } WL(Y1>|j  
  } fn/?I \  
 } f?ycZ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); UUDbOxD^w  
} 4<tbZP3/6)  
B#hvw'}  
BOOL InitHotkey() (xvg.Nby  
{ ..h@QQ  
 if(hHook!=NULL){ (`slC~"  
  nHookCount++; '4 d4i  
  return TRUE; ;o)'dK  
 } s)E8}-v  
 else .Y2Hd$rs  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); &x B^  
  if(hHook!=NULL) )?OdD7gd  
   nHookCount++; @r[SqGa:  
  return (hHook!=NULL); TDZ==<C  
} y$nI?:d  
BOOL UnInit() e wT K2  
{ a e-tAA[1Y  
 if(nHookCount>1){ Ax\d{0/oL2  
  nHookCount--; -rYb{<;ST  
  return TRUE; _t"[p_llo  
 } P<Z` 8a[  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 6:S, {@G  
 if(unhooked==TRUE){ F,)+9/S&  
  nHookCount=0; F5+F O^3E  
  hHook=NULL; T^MY w  
 } wQhuU  
 return unhooked; WJ-.?   
} |5`ecjb.  
r [^.\&-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \z6UWZ  
{ uWClT):  
 BOOL bAdded=FALSE; D=vw0Q_3Y3  
 for(int index=0;index<MAX_KEY;index++){ A@_>9;   
  if(hCallWnd[index]==0){ F{QOu0$cA4  
   hCallWnd[index]=hWnd; I74Rw*fB  
   HotKey[index]=cKey; <sm"3qs"_  
   HotKeyMask[index]=cMask; !_3b#Caf  
   bAdded=TRUE; 49>b]f,Vc  
   KeyCount++; K_ymA,&()  
   break; C7R3W,  
  } {[:C_Up)f  
 } t90M]EAV  
 return bAdded; fBZLWfp9  
} :zo5`[P  
Nz3+yxv1  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I+twI&GS  
{ 2<OU)rVE4  
 BOOL bRemoved=FALSE; a+J>  
 for(int index=0;index<MAX_KEY;index++){ dHiir&Rd9`  
  if(hCallWnd[index]==hWnd){ VI9rezZ*  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ o:cTc:l)  
    hCallWnd[index]=NULL; 3QZm *. /"  
    HotKey[index]=0; 9XQE5^  
    HotKeyMask[index]=0; @i(9k  
    bRemoved=TRUE; e0TxJ*  
    KeyCount--; QsxvA;7%  
    break; mzM95yQ^Z  
   } 2G-"HOG  
  } c\>I0HH;!  
 } "|J6*s   
 return bRemoved; aY,Bt  
} |uz<)  
t oDi70o  
void VerifyWindow() gfN=0Xj4  
{ '{~[e**  
 for(int i=0;i<MAX_KEY;i++){ Kv1~,j6  
  if(hCallWnd!=NULL){ f{L;,  
   if(!IsWindow(hCallWnd)){ 'ParMT  
    hCallWnd=NULL; EpRn,[  
    HotKey=0; mE{QTZS  
    HotKeyMask=0; PN9vg9'  
    KeyCount--; %X\A|V&  
   } #6#n4`%ER  
  } I:oEt  
 } w[l#0ZZ  
} 6y Muj<L  
yc9!JJMkH  
BOOL CHookApp::InitInstance() i" u|119  
{ E <j=5|0t  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); bcT_YFLQ  
 hins=AfxGetInstanceHandle(); (i(E~^O  
 InitHotkey(); 9?hF<}1XH}  
 return CWinApp::InitInstance(); :, v(l q  
} _hl| 3 eW5  
):tv V  
int CHookApp::ExitInstance() gn/]1NNfR  
{ =,ax"C?pR  
 VerifyWindow(); `Nvhp]E  
 UnInit(); 8Vn   
 return CWinApp::ExitInstance(); \VIY[6sn\M  
} W!.FnM5x  
dVMl;{  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file jCtk3No  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Bx}"X?%S  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ZBY}Mz$  
#if _MSC_VER > 1000 UJp'v_hN  
#pragma once 9'~qA(=.?  
#endif // _MSC_VER > 1000 la)+"uW  
S/pU|zV[  
class CCaptureDlg : public CDialog Hr}"g@ <  
{ h7K,q  S  
 // Construction 7z,  $  
 public: MW +DqT.h  
  BOOL bTray; By!u*vSev  
  BOOL bRegistered; =bJ$>Djp  
  BOOL RegisterHotkey(); ,Iz9!i J"  
  UCHAR cKey; >m%TUQ#%  
  UCHAR cMask; 0)h.[O8@>  
  void DeleteIcon(); 8'3&z-  
  void AddIcon(); 3"0QW4A  
  UINT nCount; am.d^'  
  void SaveBmp(); s8]%L4lvu  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor }0 H<G0   
  // Dialog Data {P?DkUO}  
  //{{AFX_DATA(CCaptureDlg) $(0<T<\  
  enum { IDD = IDD_CAPTURE_DIALOG }; yRyRH%p)  
  CComboBox m_Key; !E00I0W-h  
  BOOL m_bControl; ,*lns.|n  
  BOOL m_bAlt; $X.F=Kv  
  BOOL m_bShift; B3[X{n$px  
  CString m_Path; W2$rC5|  
  CString m_Number; #>_fYjT  
  //}}AFX_DATA N@k' s   
  // ClassWizard generated virtual function overrides j+AZ!$E  
  //{{AFX_VIRTUAL(CCaptureDlg) yCkWuU9  
 public: \J?&XaO=  
  virtual BOOL PreTranslateMessage(MSG* pMsg); q\!"FDOl4  
 protected: `'r]Oe  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r:0RvWif  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Bw`?zd\*  
  //}}AFX_VIRTUAL :u=y7[I  
  // Implementation 3bC-B!{;g  
 protected: gV':Xe  
  HICON m_hIcon; &l{ctP%q  
  // Generated message map functions Lnn^j#n  
  //{{AFX_MSG(CCaptureDlg) 0VR,I{<.{  
  virtual BOOL OnInitDialog(); t*BCpC }  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); fIx|0,D&7L  
  afx_msg void OnPaint(); ZZ!6O/M  
  afx_msg HCURSOR OnQueryDragIcon(); Eqny'44  
  virtual void OnCancel(); {t0!N]'  
  afx_msg void OnAbout(); Oa@SyroF=  
  afx_msg void OnBrowse(); #|:q"l9  
  afx_msg void OnChange(); yl' IL#n]r  
 //}}AFX_MSG BgCEv"G5  
 DECLARE_MESSAGE_MAP() 1T~`$zS7  
}; J$jLGy&'  
#endif }\N ~%?6D  
"GqasbX  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file PDgZb  
#include "stdafx.h" 4T)`%Oo<}  
#include "Capture.h" *$('ous8  
#include "CaptureDlg.h" #>5T,[{?j  
#include <windowsx.h> 98zJ?NaD&  
#pragma comment(lib,"hook.lib") NgxJz ]b  
#ifdef _DEBUG @frV:%  
#define new DEBUG_NEW |N^8zo :  
#undef THIS_FILE Uul5h8F  
static char THIS_FILE[] = __FILE__; jM{5nRQ  
#endif a)+*Gf7?  
#define IDM_SHELL WM_USER+1 ]wbV1Y"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); cUi6 On1C  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); VeFfkg4  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; %3HF_DNOY=  
class CAboutDlg : public CDialog ^\VVx:]  
{ 11A;z[Zk  
 public: [zrFW g6N  
  CAboutDlg(); <1~_nt~(*  
  // Dialog Data X1u\si%.4S  
  //{{AFX_DATA(CAboutDlg) `v/p4/  
  enum { IDD = IDD_ABOUTBOX }; Y|-&=  
  //}}AFX_DATA ,MLAW  
  // ClassWizard generated virtual function overrides Fb{HiU9<!  
  //{{AFX_VIRTUAL(CAboutDlg) cft@s Y  
 protected: jR3mV  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -gb@BIV#  
  //}}AFX_VIRTUAL 7.yCs[Z  
  // Implementation =G 'c%  
 protected: &y3;`A7,  
  //{{AFX_MSG(CAboutDlg) #V[Os!ns  
  //}}AFX_MSG Fl==k  
  DECLARE_MESSAGE_MAP() R&/"?&pfa  
}; %~Wr/TOt+  
e:QH3|'y  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) V-dub{K  
{ ZtI@$ An  
 //{{AFX_DATA_INIT(CAboutDlg) ~!Rf5QA85  
 //}}AFX_DATA_INIT &D7Mv5i0@  
} -BrJ5]T>*  
l>7?B2^<E  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .z,`{-7U  
{ im mf\  
 CDialog::DoDataExchange(pDX); #Y'ub 5s  
 //{{AFX_DATA_MAP(CAboutDlg) Qz<i{r-z  
 //}}AFX_DATA_MAP p<RIvSqM  
} |A)a ='Ap  
'z};tIOKJk  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) %L  nG^L  
 //{{AFX_MSG_MAP(CAboutDlg) 3HndE~_C&  
 // No message handlers AD'c#CT  
 //}}AFX_MSG_MAP #<w2xR]:  
END_MESSAGE_MAP() Oh7wyQiV  
J>0RN/38o  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) T'14OU2N{Y  
: CDialog(CCaptureDlg::IDD, pParent) 6s:  
{ 7C@m(oK  
 //{{AFX_DATA_INIT(CCaptureDlg) TI^X gl~  
  m_bControl = FALSE; ;'4Kg@/  
  m_bAlt = FALSE; pG$l   
  m_bShift = FALSE;  1W>0  
  m_Path = _T("c:\\"); |f[:mO   
  m_Number = _T("0 picture captured."); 6#2E {uy;R  
  nCount=0; H<3a yp$  
  bRegistered=FALSE; B}d)e_uLj  
  bTray=FALSE; )5s-"o<  
 //}}AFX_DATA_INIT s#(<zBZ9p#  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >% E=l  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); t)l^$j !h@  
} kE{-h'xADD  
p xQh;w  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) g+ cH  
{ 9+frxD&pO  
 CDialog::DoDataExchange(pDX); ZX40-6#O  
 //{{AFX_DATA_MAP(CCaptureDlg) ztaSIMZ  
  DDX_Control(pDX, IDC_KEY, m_Key); cq 1)b\|  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 4AN(4"$N  
  DDX_Check(pDX, IDC_ALT, m_bAlt); a +`;:tX,  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); %uy?@e  
  DDX_Text(pDX, IDC_PATH, m_Path); :h<QM$P<  
  DDX_Text(pDX, IDC_NUMBER, m_Number); NKu*kL}W=  
 //}}AFX_DATA_MAP yxy~N\ 0  
} ^A t,x  
9Qc=D"'  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) _I #a `G  
//{{AFX_MSG_MAP(CCaptureDlg) o:RO(oA0?  
 ON_WM_SYSCOMMAND() esHcE{GNOS  
 ON_WM_PAINT() (fC U+  
 ON_WM_QUERYDRAGICON() A}0u-W  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) .v#Tj|w^  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) M}!E :bv'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) >L88`  
//}}AFX_MSG_MAP `g,i `<  
END_MESSAGE_MAP() EceD\}  
Ccy0!re  
BOOL CCaptureDlg::OnInitDialog() ]iH~ 1[  
{ jsIT{a*]  
 CDialog::OnInitDialog(); 0"xD>ue&  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); -F';1D!l%  
 ASSERT(IDM_ABOUTBOX < 0xF000); %`^{Hh`  
 CMenu* pSysMenu = GetSystemMenu(FALSE); hkvymHaG  
 if (pSysMenu != NULL) M[5fNK&nD  
 { ,Zs*07!$f  
  CString strAboutMenu; @DCw(.k*  
  strAboutMenu.LoadString(IDS_ABOUTBOX); k(3FT%p  
  if (!strAboutMenu.IsEmpty()) 4*_.m9{  
  { #s|/5[i  
   pSysMenu->AppendMenu(MF_SEPARATOR); {s~t>Rp+  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); A&qZ:&(OM  
  } 2g_2$)2  
 } bxF'`^En  
 SetIcon(m_hIcon, TRUE); // Set big icon 8H2A<&3i  
 SetIcon(m_hIcon, FALSE); // Set small icon `:;fc  
 m_Key.SetCurSel(0); U jB5Xks  
 RegisterHotkey(); HT=-mwa_]  
 CMenu* pMenu=GetSystemMenu(FALSE); 2vX!j!_  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); iig@$ i#  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); rn%q*_3-o  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); OmC F8:\/  
 return TRUE; // return TRUE unless you set the focus to a control tJZ3P@ L  
} 'jd fUB  
5jK9cF$>  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 5SwQ9#  
{ qZDP-  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) CC{{@  
 { y,vrMWDy  
  CAboutDlg dlgAbout; dpI! {'"M  
  dlgAbout.DoModal(); {qPu }?0  
 } Y|N.R(sAs&  
 else K._* ~-A  
 { ?UV!^w@L:0  
  CDialog::OnSysCommand(nID, lParam); ($*R>*6<x  
 } _t;Mi/\P  
} PvqG5-L~W  
-4nSiI  
void CCaptureDlg::OnPaint() 137:T:  
{ G}p* oz~  
 if (IsIconic()) y?yWM8  
 { Fd/.\s  
  CPaintDC dc(this); // device context for painting r@]iy78 j  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); u(Y?2R  
  // Center icon in client rectangle Pvu*Y0_p  
  int cxIcon = GetSystemMetrics(SM_CXICON); k<!xOg  
  int cyIcon = GetSystemMetrics(SM_CYICON); g~Agy  
  CRect rect; )0p7d:%mV  
  GetClientRect(&rect); )6 [d'2  
  int x = (rect.Width() - cxIcon + 1) / 2; -mAi7[omh  
  int y = (rect.Height() - cyIcon + 1) / 2; ZT%Q:]B+  
  // Draw the icon k&SI -jxj  
  dc.DrawIcon(x, y, m_hIcon); y9)Rl)7-:  
 } $kCLS7 *  
 else S 0L"5B@  
 { x4nmDEpa  
  CDialog::OnPaint(); UfAN)SE"  
 } %P tdFz$  
} !Au9C   
mnS F=l;;  
HCURSOR CCaptureDlg::OnQueryDragIcon() |\_d^U &`  
{ 3X A8\Mg  
 return (HCURSOR) m_hIcon; ,CA3Q.y>|  
} a.!|A(zw  
W2G@-`,  
void CCaptureDlg::OnCancel() w*7BiZ{s<  
{ BARs1^pR4  
 if(bTray) DQRr(r~2Kj  
  DeleteIcon(); |$aTJ9 Iq:  
  CDialog::OnCancel(); +1Ua`3dWN_  
} @Ap~Wok  
^t#W?rxp&  
void CCaptureDlg::OnAbout() hAv.rjhw_  
{ S@PAtB5  
 CAboutDlg dlg; H|i39XV  
 dlg.DoModal(); +9d]([Lx  
} 60r4%> d  
OD\F*Ry~  
void CCaptureDlg::OnBrowse() ri?>@i-9=  
{ re;^,  
 CString str; {3{cU#\QA  
 BROWSEINFO bi; &m J +#vT  
 char name[MAX_PATH]; b9gezXAcd  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ,Kw]V %xOb  
 bi.hwndOwner=GetSafeHwnd(); a2tRmil  
 bi.pszDisplayName=name; EA+}Rf6}  
 bi.lpszTitle="Select folder"; vPbmQh ex  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; pk,]yi,ZF  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Hp!c\z;  
 if(idl==NULL) mcB8xE  
  return; ]-b`uYb  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 8kwe._&)  
 str.ReleaseBuffer(); A:-r 2;xB  
 m_Path=str; ;mw$(ZKa#  
 if(str.GetAt(str.GetLength()-1)!='\\') ?6=u[))M&  
  m_Path+="\\"; 2Yt+[T*  
 UpdateData(FALSE); 5o&noRIIr  
}  edv&!  
uO,9h0y0W  
void CCaptureDlg::SaveBmp() jjLwHJ  
{ >|S&@<  
 CDC dc; !QTfQ69Y0  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); wQV[ZfU^h  
 CBitmap bm; 1!4-M$-  
 int Width=GetSystemMetrics(SM_CXSCREEN); 7eyVm;LQD  
 int Height=GetSystemMetrics(SM_CYSCREEN); ;&N=t64"  
 bm.CreateCompatibleBitmap(&dc,Width,Height); GV"HkE;  
 CDC tdc; +4Uxq{.K  
 tdc.CreateCompatibleDC(&dc); $V0G[!4  
 CBitmap*pOld=tdc.SelectObject(&bm); ZFNn(n  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ^UEExj f  
 tdc.SelectObject(pOld); 2sryhS'(H  
 BITMAP btm; QxaW x  
 bm.GetBitmap(&btm); CC<(V{Png  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {r,MRZaa  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); hhU: nw  
 BITMAPINFOHEADER bih; 1'G&PX   
 bih.biBitCount=btm.bmBitsPixel; SZhW)0  
 bih.biClrImportant=0; R rtr\ a  
 bih.biClrUsed=0; 1"4Pan  
 bih.biCompression=0; +%%Ef]  
 bih.biHeight=btm.bmHeight; c\\'x\J7  
 bih.biPlanes=1; #!i&  
 bih.biSize=sizeof(BITMAPINFOHEADER); bkvm-$/  
 bih.biSizeImage=size; +"i|)yUYy}  
 bih.biWidth=btm.bmWidth; % >\v6ea  
 bih.biXPelsPerMeter=0; c :{#H9  
 bih.biYPelsPerMeter=0; UbnX%2TW  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Mt93YD-2+  
 static int filecount=0; G'M;]R9EP  
 CString name; TJY  [s-  
 name.Format("pict%04d.bmp",filecount++); 'Cv>V"X: `  
 name=m_Path+name; BM,]Wjfdj  
 BITMAPFILEHEADER bfh; y| 7sh  
 bfh.bfReserved1=bfh.bfReserved2=0; Hv~& RZpe  
 bfh.bfType=((WORD)('M'<< 8)|'B'); DNGXp5I  
 bfh.bfSize=54+size; Q^H8gsv  
 bfh.bfOffBits=54; B,_/'DneQK  
 CFile bf; ,_$}>MY;  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ QQPT=_P]  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); XDtMFig  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); U_8 Z&  
  bf.WriteHuge(lpData,size); 6` 8H k;  
  bf.Close(); /~O>He  
  nCount++; T{"[Ih3Mbl  
 } #aeKK7[  
 GlobalFreePtr(lpData); sgGXj7  
 if(nCount==1) EDA%qNd]j  
  m_Number.Format("%d picture captured.",nCount); nhu;e}[>  
 else w1&\heSQ  
  m_Number.Format("%d pictures captured.",nCount); jGSY$nt9  
  UpdateData(FALSE); ;K$ !c5  
} v><c@a=[  
p|gzU$FWbk  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) cS2PrsUx  
{ @CTSvTt$  
 if(pMsg -> message == WM_KEYDOWN) 3 i;sB  
 { <3)k M&.B  
  if(pMsg -> wParam == VK_ESCAPE) lM |}K-2  
   return TRUE; ]<xzCPB  
  if(pMsg -> wParam == VK_RETURN) $SOFq+-T  
   return TRUE; s?5vJ:M Xr  
 } ]J(BaX4  
 return CDialog::PreTranslateMessage(pMsg); lZr}F.7  
} s0To^I  
D^Gs_z$['  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !0Mx Bem  
{ +L,V_z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ GyZpdp!  
  SaveBmp(); yp!7^  
  return FALSE; nf0]<x2  
} N*`qsv 0  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ (k^o[HF  
 CMenu pop; N;q)r  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;Zy[2M  
 CMenu*pMenu=pop.GetSubMenu(0); L+X:M/)  
 pMenu->SetDefaultItem(ID_EXITICON); ogvB{R  
 CPoint pt; qI%X/'  
 GetCursorPos(&pt); T! ww3d  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); xjy(f~'  
 if(id==ID_EXITICON) YW2h#PV6_  
  DeleteIcon(); Ntt*}|:QV<  
 else if(id==ID_EXIT) FTQNS8  
  OnCancel(); 4o<rj4G>  
 return FALSE; *6bO2LO"  
} ;EB^1*A Ew  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); x:6c@2  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |Zk2]eUO+  
 AddIcon(); nCS" l5  
 return res; 3`TD>6rs  
} 6Qk[TL)t  
@GWJq 3e  
void CCaptureDlg::AddIcon() %X BMi ~  
{ dSI<s^n  
 NOTIFYICONDATA data; ;O7Vl5R  
 data.cbSize=sizeof(NOTIFYICONDATA); eBWgAf.k  
 CString tip; ]Zz.n5c  
 tip.LoadString(IDS_ICONTIP); ,rS?^"h9  
 data.hIcon=GetIcon(0); :2.<JUDM  
 data.hWnd=GetSafeHwnd(); !<3!ORFO  
 strcpy(data.szTip,tip); U0;pl2  
 data.uCallbackMessage=IDM_SHELL; EeR}34  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;  :Y Ki  
 data.uID=98; +ag_w}  
 Shell_NotifyIcon(NIM_ADD,&data); D&{CC  
 ShowWindow(SW_HIDE); v1rTl5H  
 bTray=TRUE; /Nkxb&  
} YsMM$rjP +  
`&9iC 4P  
void CCaptureDlg::DeleteIcon() V}Ee1C  
{ P1R5}i  
 NOTIFYICONDATA data; LS$zA>:  
 data.cbSize=sizeof(NOTIFYICONDATA); CTS1."kx1  
 data.hWnd=GetSafeHwnd(); RGL2S]UFs  
 data.uID=98; c'>_JlG~  
 Shell_NotifyIcon(NIM_DELETE,&data); BwkY;Ur/AL  
 ShowWindow(SW_SHOW); *M)M!jTv  
 SetForegroundWindow(); s"XwO8yhM  
 ShowWindow(SW_SHOWNORMAL); Eq%f`Qg+1E  
 bTray=FALSE; /J(vqYK"  
} Bf.iRh0Q5  
ve+bR   
void CCaptureDlg::OnChange() H,c`=Ii3  
{ jfiUf1Mj  
 RegisterHotkey(); ! B92W  
} *7E#=xb  
eyuyaSE  
BOOL CCaptureDlg::RegisterHotkey() e=nvm'[h  
{ L9<\vJ  
 UpdateData(); 9;'#,b*(  
 UCHAR mask=0; ! Sw=ns7  
 UCHAR key=0; zO---}[9a  
 if(m_bControl) lWe cxD$  
  mask|=4; T9I$6HAi  
 if(m_bAlt) *:Rs\QH   
  mask|=2; q-+:1E  
 if(m_bShift) MI'"Xzp{s  
  mask|=1; -pIz-*  
  key=Key_Table[m_Key.GetCurSel()]; uorX;yekC  
 if(bRegistered){ P6O\\,B1A  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); f9 \$,7F  
  bRegistered=FALSE; x1?mE)n]  
 } [@ev%x,  
 cMask=mask; pY@QR?F\  
 cKey=key; ;Y[D#Ja-  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); SDC'S]{ew  
 return bRegistered; & W od  
} Uns%6o  
9OV@z6  
  四、小结 y]0O"X-G  
q~b# ml2QS  
  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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