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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: .}t~'*D  
  {o_X`rgrL  
  一、实现方法 +ga k#M"n\  
HHDl8lo  
  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: vQosPS_2L  
I`-8Air5f  
#pragma data_seg("shareddata") 5na~@-9p  
HHOOK hHook =NULL; //钩子句柄 Uc7mOa}4  
UINT nHookCount =0; //挂接的程序数目 S?1AFI9{   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 xST8|H  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 5D\f8L  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ?pr9f5  
static int KeyCount =0; IUE~_7  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 K1mPr^3rC  
#pragma data_seg() *"?l]d  
K28+]qy[  
  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。 ALrw\qV  
}\tdcTMgS  
  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: v- T$:cL  
;X?}x%$  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 1O/+8yw  
cKey,UCHAR cMask) R;s?$;I  
{ l~c@^!  
 BOOL bAdded=FALSE; sGy eb5c  
 for(int index=0;index<MAX_KEY;index++){ bLlKe50  
  if(hCallWnd[index]==0){ ~ELNyI11  
   hCallWnd[index]=hWnd; 2`7==?  
   HotKey[index]=cKey; GPkmf%FJ  
   HotKeyMask[index]=cMask; 2D75:@JL}|  
   bAdded=TRUE; xHL( !P F  
   KeyCount++; d"}k! 0m  
   break; -G}[AkmS  
  } cii_U=   
 } -~s!73pDY  
 return bAdded; Rp.Sj{<2  
} zL$@`Eh-KP  
//删除热键 *w^C"^*  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) PmkR3<=leg  
{ \Jx04[=  
 BOOL bRemoved=FALSE; )WRLBFi3  
 for(int index=0;index<MAX_KEY;index++){ "'c A2~  
  if(hCallWnd[index]==hWnd){ >zw.GwN|  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ q*U*Fu+  
    hCallWnd[index]=NULL; K{&mI/ ;  
    HotKey[index]=0; nxUJN1b!N  
    HotKeyMask[index]=0; f!\lg  
    bRemoved=TRUE; `|6'9  
    KeyCount--; qaY1xPWz"  
    break; ve MH  
   } {IxA)v-`  
  } jr)1(**  
 } $+P>~X)  
 return bRemoved; ?oVx2LdD|  
} M2 ,YsHt  
OVm\  
X &uTSgN  
  DLL中的钩子函数如下: AJh w  
}+)fMZz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) wT;0w3.Z  
{ Z>QF#."m  
 BOOL bProcessed=FALSE; +AR5W(&  
 if(HC_ACTION==nCode) ^N7e76VwR  
 { DK$X2B"cV  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 JLnH&(O  
   switch(wParam) {K+i cTL3  
   {  >"|B9Woc  
    case VK_MENU: %SX|o-B~.o  
     MaskBits&=~ALTBIT; iX0i2ek  
     break; h]Wr [v  
    case VK_CONTROL: 4lr(,nPRD  
     MaskBits&=~CTRLBIT; I KqQ>Z-q~  
     break; H\h3 TdL  
    case VK_SHIFT: < vL,*.zd  
     MaskBits&=~SHIFTBIT; 1;C+$  
     break; =Q+;=-1  
    default: //judge the key and send message @W s*QTlV  
     break; n,jKmA  
   } i*|\KM?P  
   for(int index=0;index<MAX_KEY;index++){ Z'4./  
    if(hCallWnd[index]==NULL) '10oK {m$  
     continue; O[I\A[*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c9HrMgW  
    { n!NS(. o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); tXoWwQD;Y  
     bProcessed=TRUE; k[bD\'  
    } @JtM5qB  
   } JW{rA6?   
  } q)Lu_6 mg  
  else if((lParam&0xc000ffff)==1){ //有键按下 q"%_tS  
   switch(wParam)  8cU}I4|  
   { k,85Y$`'  
    case VK_MENU: GC?ON0g5s  
     MaskBits|=ALTBIT; gnFr}L&j  
     break; C9~52+S  
    case VK_CONTROL: YUx.BZf7  
     MaskBits|=CTRLBIT; gYNjzew'  
     break; 1$D_6U:H0  
    case VK_SHIFT: 9`1O"R/  
     MaskBits|=SHIFTBIT; .LZwuJ^;  
     break; ).Fpgxs  
    default: //judge the key and send message 43|XSyS  
     break; 4[.oPK=i  
   } 4[;X{ !  
   for(int index=0;index<MAX_KEY;index++){ W~zbm]  
    if(hCallWnd[index]==NULL) d@ i}-;  
     continue; ?\vh9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'm4W}F  
    { )Hpa}FGT  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); B P2=2)Q  
     bProcessed=TRUE; Ka[t75~;  
    } QIB\AAclO  
   } ]QpWih00V  
  } I/&%]"[^u  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 E8pB;\Z(  
   for(int index=0;index<MAX_KEY;index++){ 6{"$nF]  
    if(hCallWnd[index]==NULL) "/3 db[  
     continue; |_] Q$q[[%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ePr&!Tz#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); GO__$%~  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 55tKTpV  
   } { vKLAxc  
  } {_`^R>"\&w  
 } 23c 8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); =-8bsV/l  
} ;LG#.~f  
*QwY]j%^  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: rf?qdd(~cH  
yUZb #%n  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O!P H&;H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); y`F3Hr c  
:<hXH^n  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: F @mQQ  
r~/   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) rf>0H^r  
{ i(AT8Bo2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) _JHd9)[  
 { =h0,?]z  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 <~6h|F8  
  SaveBmp(); cl]Mi "3_  
  return FALSE; [U5\bX@$  
 } kS_(wp A  
 …… //其它处理及默认处理 AyNI$Q6Z  
} U^Q:Y}^  
M-1ngI0H;  
fz\9 S  
  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。 t"= E^r  
XZ sz/#  
  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。 mVVD!  
S 5/R_5  
  二、编程步骤 D)j(,vt  
JT-J#Ag  
  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"; }|g\ 8jq  
{@+Ty]e  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Yzh"1|O  
0\[Chja  
  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; 2 lj'"nm  
MRb-H1+Xf  
  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; +z9Q-d%O  
Q4+gAS9  
  5、 添加代码,编译运行程序。 d/BM&r  
LcUh;=r}&  
三、程序代码 I1pWaQ0  
-=~| ."O  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ~$)2s7 O  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Pb1*\+  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ,q}ML TS i  
#if _MSC_VER > 1000 Hea;?4Vg  
#pragma once N+Y]st+  
#endif // _MSC_VER > 1000 NWMFtT  
#ifndef __AFXWIN_H__ bYEy<7)x  
#error include 'stdafx.h' before including this file for PCH iV&6nh(  
#endif x4E7X_  
#include "resource.h" // main symbols )n2 re?S  
class CHookApp : public CWinApp %Z):>'  
{ {u#;?u=|  
 public: =<?+#-;p  
  CHookApp(); p-Kz-+A[  
  // Overrides / c AUl  
  // ClassWizard generated virtual function overrides ti I.W  
  //{{AFX_VIRTUAL(CHookApp) >8k _n  
 public: GBRa.;Kk  
  virtual BOOL InitInstance(); f@Zszt  
  virtual int ExitInstance(); 9{ >Ui  
  //}}AFX_VIRTUAL .^h#_[dp  
  //{{AFX_MSG(CHookApp) y#U+c*LB  
  // NOTE - the ClassWizard will add and remove member functions here. S/9DtXQ  
  // DO NOT EDIT what you see in these blocks of generated code ! ,n3a gkPO>  
  //}}AFX_MSG \l9qt5rS  
  DECLARE_MESSAGE_MAP() @cFJeOC|  
}; czS+< w  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); I@yCTl uV$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ioYGZ%RG#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !bN*\c  
BOOL InitHotkey(); PE5R7)~A  
BOOL UnInit(); 2zs73:z  
#endif 9s6U}a'c  
G#d{,3Gq1  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 9f&C  
#include "stdafx.h" {bJ`~b9e  
#include "hook.h" 4nh>'v%pD  
#include <windowsx.h> >`A9[`$n  
#ifdef _DEBUG mF,Y?ax  
#define new DEBUG_NEW zi]\<?\X  
#undef THIS_FILE `HZ;NRr  
static char THIS_FILE[] = __FILE__; |}(`kW  
#endif k'Sp.  
#define MAX_KEY 100 LUM@#3&  
#define CTRLBIT 0x04  |8My42yf  
#define ALTBIT 0x02 u~WVGjoQ  
#define SHIFTBIT 0x01 5h Q E4/hH  
#pragma data_seg("shareddata") PH+S};Uxv  
HHOOK hHook =NULL; B{'( L |  
UINT nHookCount =0; VJickXA  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey +^=8ge}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 56zL"TF`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ??M"6k  
static int KeyCount =0; {>DE sO  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift apg=-^L'  
#pragma data_seg() HY&aV2|A1  
HINSTANCE hins; $}>+kHoT{  
void VerifyWindow(); +@p% p  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) mLP.t%?#   
//{{AFX_MSG_MAP(CHookApp) y5 *Z 3"<  
// NOTE - the ClassWizard will add and remove mapping macros here. =a@j=  
// DO NOT EDIT what you see in these blocks of generated code! -* WXMzr  
//}}AFX_MSG_MAP DAcQz4T`  
END_MESSAGE_MAP() 4 QvsBpz@  
:h\Q;?  
CHookApp::CHookApp() ?o81E2TJO  
{ n%-R[vW  
 // TODO: add construction code here, `(_s|-$  
 // Place all significant initialization in InitInstance KH(%?  
} mlJ!:WG  
5|o6v1bM  
CHookApp theApp; "4ri SxEyF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4dO~C  
{ eYN5;bx)W  
 BOOL bProcessed=FALSE; 6{n!Cb[e  
 if(HC_ACTION==nCode) F'4w;-ax  
 { VyzS^AH K  
  if((lParam&0xc0000000)==0xc0000000){// Key up e4HA7=z  
   switch(wParam) =5/9%P8j9  
   { 8<8:+M}  
    case VK_MENU: A OISs4  
     MaskBits&=~ALTBIT; mH%yGBp_  
     break; -likj# Z  
    case VK_CONTROL: y\Ic@-aWI  
     MaskBits&=~CTRLBIT; 1.D,W1s  
     break; :N4t49i  
    case VK_SHIFT: LBM ^9W  
     MaskBits&=~SHIFTBIT; :.Jf0  
     break; 1FlX'[vh  
    default: //judge the key and send message U+:m4a  
     break; _+K_5IO4  
   } \m(VdE  
   for(int index=0;index<MAX_KEY;index++){ E"qRw_ ~t  
    if(hCallWnd[index]==NULL) u%}nw :>  
     continue; 9 7GV2]-M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =t9\^RIx)?  
    { Cs9.&Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /fZe WU0W  
     bProcessed=TRUE; jcuB  
    } k5:G-BQ:  
   } 9 Vkb>yFX'  
  } 'p> Ra/4  
  else if((lParam&0xc000ffff)==1){ //Key down mZSD(  
   switch(wParam) _jLL_GD  
   { L ^q""[  
    case VK_MENU: w80oXXs[#  
     MaskBits|=ALTBIT; cq}EZ@ .  
     break; `Aw^H!  
    case VK_CONTROL: . $BUw  
     MaskBits|=CTRLBIT; =Je[c,&j$?  
     break; tnH2sHby  
    case VK_SHIFT: Al}6q{E9+8  
     MaskBits|=SHIFTBIT; `UD/}j@  
     break; _FpTFfB  
    default: //judge the key and send message ad*m%9Y1Q  
     break; W-mQjJ`,B  
   } &dM. d!  
   for(int index=0;index<MAX_KEY;index++) 0AZ")<^~7  
   { ZCmgs4W!  
    if(hCallWnd[index]==NULL) w_.F' E  
     continue; mq@6Q\Z+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,]9P{k]O  
    { 9oYgl1}d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); * @ 3Ag(  
     bProcessed=TRUE; w,#>G07D  
    } em,u(#)&  
   } )c8rz[i  
  } fmU {  
  if(!bProcessed){ /]K^ rw[  
   for(int index=0;index<MAX_KEY;index++){ a1EOJ^}0  
    if(hCallWnd[index]==NULL) >AVVEv18  
     continue; t;W0"ci9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #|L8tuWW  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); +R3k-' >  
   } 39:bzUIF  
  } PVe xa|aaX  
 } @.$|w>>T  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;_c;0)  
} ]Lf{Jboo  
Zq+v6fk_Mn  
BOOL InitHotkey() >3p \m  
{ S\:P-&dC  
 if(hHook!=NULL){ ZP@ $Q%up  
  nHookCount++; cG[l!Z  
  return TRUE; 24 [+pu  
 } 4 {y)TZ  
 else tr<Nm6!  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); iW$_zgN  
  if(hHook!=NULL) CAfGH!l!  
   nHookCount++; ]~9t Y n  
  return (hHook!=NULL); $ `ov4W  
} 8EW_V$>R  
BOOL UnInit() aOlT;h  
{ *=8JIs A>!  
 if(nHookCount>1){ .YhA@8nc~l  
  nHookCount--; BF\XEm?!  
  return TRUE; )(bW#-  
 } LInz<bc<(  
 BOOL unhooked = UnhookWindowsHookEx(hHook); YWe{juXSw  
 if(unhooked==TRUE){ mk;&yh  
  nHookCount=0; dG@%jD)  
  hHook=NULL; %RTBV9LIXr  
 } <^&ehy:7y  
 return unhooked; ?9!6%]2D  
} ,)0H3t  
Bo)3!wO8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ni.cTOSx  
{ nCUg ,;_=  
 BOOL bAdded=FALSE; v\c>b:AofD  
 for(int index=0;index<MAX_KEY;index++){ e%svrJ2   
  if(hCallWnd[index]==0){ eWCb73  
   hCallWnd[index]=hWnd; `#rL*;\uV  
   HotKey[index]=cKey; joFm]3$;  
   HotKeyMask[index]=cMask; ,f~J`3(&  
   bAdded=TRUE; qB5j;@ r  
   KeyCount++; 1Ir21un  
   break; k Z?=AXu  
  } F^WP<0C  
 } PRx8I .  
 return bAdded; aRj9E}  
} $Ipg&`S"  
caIL&G,  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) C^O VB-  
{ =O&%c%~q  
 BOOL bRemoved=FALSE; $mu^G t  
 for(int index=0;index<MAX_KEY;index++){ HHA<IZ#;,  
  if(hCallWnd[index]==hWnd){ 52%2R]G!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ vmU@^2JSJ  
    hCallWnd[index]=NULL; Z?6%;n^ 54  
    HotKey[index]=0; @3) (BpFe  
    HotKeyMask[index]=0; qyZ" %Kz  
    bRemoved=TRUE; J1,9kCO  
    KeyCount--; (/z_Q{"N  
    break; o2nv+fy W  
   } qU+t/C.  
  } VrHv)lUr  
 } m}C>ti`VD  
 return bRemoved; ap.K=-H  
} rA3$3GLQ-  
Jb0`42  
void VerifyWindow() tRs [ YK  
{ p)jk>j B  
 for(int i=0;i<MAX_KEY;i++){ rV2WnAb[H&  
  if(hCallWnd!=NULL){ -z-C*%~  
   if(!IsWindow(hCallWnd)){ ]s]vZ  
    hCallWnd=NULL; )P%ZA)l%_o  
    HotKey=0; lG9bLiFY  
    HotKeyMask=0; eX?OYDDC0j  
    KeyCount--; xqeyD*s  
   } 02f~En}>6  
  } 4QH3fTv   
 } ;!=G   
} ,$@bE  
.7Dtm<K#  
BOOL CHookApp::InitInstance() lsJSYJG&  
{ ojafy}  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); A0/"&Ag]  
 hins=AfxGetInstanceHandle(); &TnS4O  
 InitHotkey(); 9Z|jxy  
 return CWinApp::InitInstance(); rx'RSo#1O  
} !`k1:@NZ  
_Us#\+]_:  
int CHookApp::ExitInstance() Z 8S\@I  
{ ?h3Y)5xT  
 VerifyWindow(); 9{'N{  
 UnInit(); ?~l6K(*2  
 return CWinApp::ExitInstance(); a+[RS]le  
} HU1h8E$-  
n3T>QgK  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file <Q3oT  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) RU'=ERYC  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Pj[PIz  
#if _MSC_VER > 1000 Cw iKi^m  
#pragma once 1Lc#m`Jln  
#endif // _MSC_VER > 1000 6o!!=}'E[  
p09HL%~R  
class CCaptureDlg : public CDialog -Y1e8H ='  
{ Z)e/ !~""]  
 // Construction i/65v  
 public: @GPCwE1  
  BOOL bTray; o@r7 n>G  
  BOOL bRegistered; Hn7_FOC  
  BOOL RegisterHotkey(); Mz9 r5  
  UCHAR cKey; ~xbe~$$Q@  
  UCHAR cMask; %d 1,a$*3}  
  void DeleteIcon(); tnV/xk#!  
  void AddIcon(); Bgn&:T8<  
  UINT nCount; BTl k Etm  
  void SaveBmp(); m.JBOq=  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor j5QuAU8  
  // Dialog Data .sxcCrQE  
  //{{AFX_DATA(CCaptureDlg) O)C\v F#  
  enum { IDD = IDD_CAPTURE_DIALOG }; "$~':) V"  
  CComboBox m_Key; N"pc,Q\xU  
  BOOL m_bControl; H~oail{EQ  
  BOOL m_bAlt; xj<Rp|7&  
  BOOL m_bShift; Um }  
  CString m_Path; 5Iy|BRU(%  
  CString m_Number; 2n,*Nd`  
  //}}AFX_DATA ~De"?  
  // ClassWizard generated virtual function overrides +s"hqm  
  //{{AFX_VIRTUAL(CCaptureDlg) m-%E-nr  
 public: N/[p <  
  virtual BOOL PreTranslateMessage(MSG* pMsg); #=D) j  
 protected: kj|6iG  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8|b3j^u  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2;[D;Y}  
  //}}AFX_VIRTUAL Kh"?%ZIa  
  // Implementation -<c=US  
 protected: CHdX;'`*  
  HICON m_hIcon; aC^\(wp[  
  // Generated message map functions heltgRt  
  //{{AFX_MSG(CCaptureDlg) )bA;?i  
  virtual BOOL OnInitDialog(); gMv.V{vD  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); )}''L{k-  
  afx_msg void OnPaint(); ?RX3MUN  
  afx_msg HCURSOR OnQueryDragIcon(); #c!*</  
  virtual void OnCancel(); b[__1E9v'  
  afx_msg void OnAbout(); %&$Tz1"  
  afx_msg void OnBrowse(); !5wIIS:FT  
  afx_msg void OnChange(); +y,T4^{  
 //}}AFX_MSG eiuSvyY  
 DECLARE_MESSAGE_MAP() E0BMv/r8b  
}; jAGTD I  
#endif YSs)HV.8  
062,L~&E  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "MxnFeLM#  
#include "stdafx.h" kHk px52  
#include "Capture.h" ,K>I%_!1  
#include "CaptureDlg.h" y6@0O%TDN  
#include <windowsx.h> Q0$8j-1I  
#pragma comment(lib,"hook.lib") T`/AY?#  
#ifdef _DEBUG ,V'o4]H  
#define new DEBUG_NEW ,4 hJT  
#undef THIS_FILE he#J|p  
static char THIS_FILE[] = __FILE__; H1 2Fw'2  
#endif h-g+g#*  
#define IDM_SHELL WM_USER+1 ke{8 ^X~#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7t3X)Ah  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S,D8F&bg  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; "lQ*1.i  
class CAboutDlg : public CDialog ?M$.+V{a  
{ 3NZK*!@ '  
 public: s|@6S8E  
  CAboutDlg(); kM!kD4&  
  // Dialog Data d; [C6d  
  //{{AFX_DATA(CAboutDlg) ?8HHA: GP  
  enum { IDD = IDD_ABOUTBOX }; "-y-iJ  
  //}}AFX_DATA < |e,05aM  
  // ClassWizard generated virtual function overrides p$SX  
  //{{AFX_VIRTUAL(CAboutDlg) r)qnl9?;`]  
 protected: "vA}FV%tRq  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support jnd[6v=C7-  
  //}}AFX_VIRTUAL ai}mOyJs  
  // Implementation 8][nmjk0  
 protected: X$%'  
  //{{AFX_MSG(CAboutDlg) XV!6dh!  
  //}}AFX_MSG }{M#EP8q+  
  DECLARE_MESSAGE_MAP() kSC}aN'  
}; >AC]#'  
"X2Vrn'  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -\+s#kE:  
{ ~L]|?d"  
 //{{AFX_DATA_INIT(CAboutDlg) A+HF@Uw}^  
 //}}AFX_DATA_INIT <Q$@r?Mu]  
} r[1i*b$  
u,F nAh?"  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !P ~_Dl2d  
{ EQ2#/>  
 CDialog::DoDataExchange(pDX); I6~pV@h^=  
 //{{AFX_DATA_MAP(CAboutDlg) k- Q%.o  
 //}}AFX_DATA_MAP aF8fqu\  
} jNu9KlN  
Yv hA_v  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) z MLK7+  
 //{{AFX_MSG_MAP(CAboutDlg) b6W2^tr-  
 // No message handlers |lXc0"H[o  
 //}}AFX_MSG_MAP h"`ucC8X  
END_MESSAGE_MAP() m_hN*v Py  
$`APHjijN  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) d#6`&MR  
: CDialog(CCaptureDlg::IDD, pParent) a5 *2h{i  
{ Y;nZ=9Sw  
 //{{AFX_DATA_INIT(CCaptureDlg) Z 1zVwHa_  
  m_bControl = FALSE; :iFIQpk  
  m_bAlt = FALSE; ! N|0x`  
  m_bShift = FALSE; .e3NnOzyxS  
  m_Path = _T("c:\\"); `L:CA5sBud  
  m_Number = _T("0 picture captured."); LY6;.d$J  
  nCount=0; XXbqQhf  
  bRegistered=FALSE; ag$Vgl  
  bTray=FALSE; C?ulj9=Z  
 //}}AFX_DATA_INIT nYWvTvZ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 VQY&g;[d  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); lW<PoT  
} 5'0xz.)!  
-<Hu!V`+  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) [FK<96.nt  
{ OF%B[h&   
 CDialog::DoDataExchange(pDX); ?in|qevL  
 //{{AFX_DATA_MAP(CCaptureDlg) &GNxo$CG  
  DDX_Control(pDX, IDC_KEY, m_Key); K6y :mJYp\  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); s?zAP O8Sz  
  DDX_Check(pDX, IDC_ALT, m_bAlt); /V=24\1Ky  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 6}75iIKi  
  DDX_Text(pDX, IDC_PATH, m_Path); ";BlIovT=R  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 9V,!R{kO!  
 //}}AFX_DATA_MAP :*t"8;O[  
} =81@ o,1w  
VmCW6 G#M  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) \Z^TXyu   
//{{AFX_MSG_MAP(CCaptureDlg) .udv"?!z  
 ON_WM_SYSCOMMAND() RbCPmiZcH  
 ON_WM_PAINT() A; 5n:Sd  
 ON_WM_QUERYDRAGICON() *"WDb|PBb  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) J\J?yo 6  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) <F'X<Bau  
 ON_BN_CLICKED(ID_CHANGE, OnChange) RlheQTJ  
//}}AFX_MSG_MAP cHcmgW\4  
END_MESSAGE_MAP() T_X6Ulp  
mK[)mC _8  
BOOL CCaptureDlg::OnInitDialog() Qhs/E`k4  
{ bfA=3S"0  
 CDialog::OnInitDialog(); _FXZm50\g{  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);  ]E_h  
 ASSERT(IDM_ABOUTBOX < 0xF000); <WjF*x p  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Vm5c+;  
 if (pSysMenu != NULL) m~@;~7Ix  
 { ?s\ OUr  
  CString strAboutMenu; 3ia^\ jw  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?I/qE='*  
  if (!strAboutMenu.IsEmpty()) z>jUR,!GT  
  { }K1JU`Lz  
   pSysMenu->AppendMenu(MF_SEPARATOR); ?|WoIV.  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !iH-#B-  
  } 4&xZ]QC)O5  
 }  DVah  
 SetIcon(m_hIcon, TRUE); // Set big icon AgOp.~*Z~V  
 SetIcon(m_hIcon, FALSE); // Set small icon 5~Cakd ]>  
 m_Key.SetCurSel(0); H~GQ;PhRx  
 RegisterHotkey(); A 6OGs/:&  
 CMenu* pMenu=GetSystemMenu(FALSE); Na$Is'F &p  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); b8$gx:aJ>$  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); CSGz3uC2D  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ^Y u6w\QM  
 return TRUE; // return TRUE unless you set the focus to a control nt;haeJ  
} RletL)  
QYa(N[~a  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) '; =f  
{ wj[\B*$?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) GiP`dtK   
 { [01.\eh  
  CAboutDlg dlgAbout; ]Pry>N3G5  
  dlgAbout.DoModal(); h@:TpE+N  
 } Ct2j ZqCDo  
 else #O$  
 { AX?fuDLs  
  CDialog::OnSysCommand(nID, lParam); I8+~ &V}  
 } [cTe54n  
} %STliJ  
!O.[PH(,*  
void CCaptureDlg::OnPaint() -RO7 'm0  
{ r|PFw6  
 if (IsIconic()) /&CmO>^e  
 { d)@<W1;  
  CPaintDC dc(this); // device context for painting o@#Y8M  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); YLwnhy>dD  
  // Center icon in client rectangle ME;n^y\8  
  int cxIcon = GetSystemMetrics(SM_CXICON); D?C)BcN  
  int cyIcon = GetSystemMetrics(SM_CYICON); aO@ 7O*  
  CRect rect; %FS$zOsgGK  
  GetClientRect(&rect);  }8@M@  
  int x = (rect.Width() - cxIcon + 1) / 2; N=5)fe%{4  
  int y = (rect.Height() - cyIcon + 1) / 2; =Zu^80/  
  // Draw the icon NE/m-ILw  
  dc.DrawIcon(x, y, m_hIcon); W%.v.0   
 } nSF``pp+  
 else uch>AuF:  
 { p8kr/uMP ;  
  CDialog::OnPaint(); R)M_|ca  
 } f6_];]yP  
} Xcrk;!IB?  
pM{nh00[  
HCURSOR CCaptureDlg::OnQueryDragIcon() Z.W66\8~}^  
{ s[K^9wz  
 return (HCURSOR) m_hIcon; RlqQ  
} &ISb~5  
:Xn7Ha[f  
void CCaptureDlg::OnCancel() !ALKSiSl  
{ Yk'9U-.mc  
 if(bTray) PzV@umC1#f  
  DeleteIcon(); lz?;#U  
  CDialog::OnCancel(); &?uz`pv2  
} HQUeWCN  
.s<*'B7&  
void CCaptureDlg::OnAbout() `6[I^qG".  
{ ^K7ic,{  
 CAboutDlg dlg; %.<H=!$  
 dlg.DoModal();  QV h4  
}  6\u!E~zy  
h)6GaJ=  
void CCaptureDlg::OnBrowse() ' zEI;v  
{ :U d  
 CString str; rwniOQe  
 BROWSEINFO bi; DNR~_3Aq  
 char name[MAX_PATH]; )mJf|W!Z#  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); U9&k;`  
 bi.hwndOwner=GetSafeHwnd(); tV_t6x_.  
 bi.pszDisplayName=name; Tx 1 vL  
 bi.lpszTitle="Select folder"; ?E9DXg  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; &O)&k  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?9HhG?_x  
 if(idl==NULL) RP 2_l$  
  return; DbZ0e5  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 7R3fqU.Rq  
 str.ReleaseBuffer(); PN$X N<  
 m_Path=str; osOVg0Gyj  
 if(str.GetAt(str.GetLength()-1)!='\\') +B'8|5tPX  
  m_Path+="\\"; Z<#hS=eY  
 UpdateData(FALSE); 4<lQwV6=  
} ( 7ws{)  
^pS+/ZSi^  
void CCaptureDlg::SaveBmp() !PMU O\y  
{ & SAH2xR  
 CDC dc; \X F}?*8  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); |+:h|UIUQ  
 CBitmap bm; ( =16PYs  
 int Width=GetSystemMetrics(SM_CXSCREEN); y8s!M  
 int Height=GetSystemMetrics(SM_CYSCREEN); [3W*9j  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ;uqx@sx ;  
 CDC tdc; `:wvh(  
 tdc.CreateCompatibleDC(&dc); tM,%^){p$  
 CBitmap*pOld=tdc.SelectObject(&bm); ' JdkUhq1V  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); WKr X,GF  
 tdc.SelectObject(pOld); rZojY}dWJ  
 BITMAP btm; 6cdMS[_SD(  
 bm.GetBitmap(&btm); R*zO dxY  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; !j1[$% =#  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ygS L  
 BITMAPINFOHEADER bih; R8-^RvG  
 bih.biBitCount=btm.bmBitsPixel; R//$r%a  
 bih.biClrImportant=0; 2oZ9laJO  
 bih.biClrUsed=0; X 6 lH|R  
 bih.biCompression=0; ;' nL:\  
 bih.biHeight=btm.bmHeight; >sD4R}\})  
 bih.biPlanes=1; w-b' LP  
 bih.biSize=sizeof(BITMAPINFOHEADER); Vvt  ;  
 bih.biSizeImage=size; Kzb`$CGK  
 bih.biWidth=btm.bmWidth; R0;ef D  
 bih.biXPelsPerMeter=0; )9B:wc"  
 bih.biYPelsPerMeter=0; G~wFnl%  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3Wcy)y>2Ap  
 static int filecount=0; 8ZcU[8r  
 CString name; J9%@VZut  
 name.Format("pict%04d.bmp",filecount++); <&pKc6+{  
 name=m_Path+name; &[a Tw{2  
 BITMAPFILEHEADER bfh; D -IR!js ]  
 bfh.bfReserved1=bfh.bfReserved2=0; Sd))vS^g  
 bfh.bfType=((WORD)('M'<< 8)|'B'); w?mEuXc  
 bfh.bfSize=54+size; #.5vC5  
 bfh.bfOffBits=54; m ,>  
 CFile bf; p<`+sf}A:  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ s$DrR  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); pi@Xkw  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); fd8!KO  
  bf.WriteHuge(lpData,size); VW@ x=m  
  bf.Close(); t` 8!AhOgc  
  nCount++; }wwe}E-e  
 } \aP6_g:N}  
 GlobalFreePtr(lpData); `7+j0kV)  
 if(nCount==1) 9 L?;FY)_  
  m_Number.Format("%d picture captured.",nCount); %8)W0WMe  
 else Qn:kz*:  
  m_Number.Format("%d pictures captured.",nCount); PzZZ>7_6S  
  UpdateData(FALSE); Y&*x4&Lb  
} G",.,Px  
K?u(1  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) +m,!e*g  
{ ?@R")$  
 if(pMsg -> message == WM_KEYDOWN) p|XAlia  
 { 8I+d)(:  
  if(pMsg -> wParam == VK_ESCAPE) g):]'  
   return TRUE; ]Z4zF"@  
  if(pMsg -> wParam == VK_RETURN) E-ZRG!)[v  
   return TRUE; E1Q0k5@  
 } e kQrW%\3  
 return CDialog::PreTranslateMessage(pMsg); BF8"rq}r0  
} X6RQqen3:  
Uh|>Skic4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) GZ }/leR  
{ BRbV7&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ohc1 ~?3b  
  SaveBmp(); Bmo$5$  
  return FALSE; VjbG(nB?_  
} WW "i  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){  0=6/yc  
 CMenu pop; nhdTTap&9  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 0O2n/`'  
 CMenu*pMenu=pop.GetSubMenu(0); sI 4yG  
 pMenu->SetDefaultItem(ID_EXITICON); U!e6FHj7  
 CPoint pt; 2L\3S ukj  
 GetCursorPos(&pt); .tF|YP==  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {<w +3Va  
 if(id==ID_EXITICON) q]<xMg#nu  
  DeleteIcon(); , fb( WY  
 else if(id==ID_EXIT) N dR ]  
  OnCancel(); r$nkU4N'  
 return FALSE; h3Fo-]0  
} )QY![&k}1z  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); tSv0" L  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) +=c am/A  
 AddIcon(); We`'>'W0  
 return res; ^[-> )  
} Y?Vz(udD  
o;`!kIQ  
void CCaptureDlg::AddIcon() QLb MPS  
{ @qK<T  
 NOTIFYICONDATA data; BIWD/ |LQ  
 data.cbSize=sizeof(NOTIFYICONDATA); qeaA&(|5  
 CString tip; @?&Wm3x9  
 tip.LoadString(IDS_ICONTIP); EychR/s  
 data.hIcon=GetIcon(0); rhY_|bi4P  
 data.hWnd=GetSafeHwnd(); K5ZnS`c;  
 strcpy(data.szTip,tip); S2=%x.  
 data.uCallbackMessage=IDM_SHELL; 0^_MN~s(X  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; C|z%P}u#p  
 data.uID=98; #i@h{ R01  
 Shell_NotifyIcon(NIM_ADD,&data); %!.M~5mCd  
 ShowWindow(SW_HIDE); t 6u-G+}  
 bTray=TRUE; 4/wwn6I}G  
}  Iao[Pyk  
WPY8C3XO  
void CCaptureDlg::DeleteIcon() #*%fu  
{ t&c&KFK)I&  
 NOTIFYICONDATA data; pZ+j[!  
 data.cbSize=sizeof(NOTIFYICONDATA); T$b\Q  
 data.hWnd=GetSafeHwnd(); D6=HYqdj  
 data.uID=98; BpT"~4oV5  
 Shell_NotifyIcon(NIM_DELETE,&data); qj?2%mK`  
 ShowWindow(SW_SHOW); Sa]Ek*  
 SetForegroundWindow(); V 4qtaHf  
 ShowWindow(SW_SHOWNORMAL); 5RA<Z.  
 bTray=FALSE; o+)A'S  
} /)1v9<vM"  
]XrE  
void CCaptureDlg::OnChange() zW'/2W.  
{ 4DML  
 RegisterHotkey(); jmW^`%;7  
} l]vohLz 3!  
fykI,!  
BOOL CCaptureDlg::RegisterHotkey() tSw>@FM  
{ G.VYp6)5  
 UpdateData(); I]sqi#h$2W  
 UCHAR mask=0; 7,_-XV2  
 UCHAR key=0; \j:gr>4  
 if(m_bControl) E\e]K !  
  mask|=4; =jIxI,  
 if(m_bAlt) nGZ \<-  
  mask|=2; Ff/Ig]Lb  
 if(m_bShift) r%!FmS<  
  mask|=1; mq`5w)S)\o  
  key=Key_Table[m_Key.GetCurSel()]; T0L+z/N_m.  
 if(bRegistered){ A#:8X1w  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5fq.*1f  
  bRegistered=FALSE; cqg=8$RB  
 } {( HxG4~  
 cMask=mask; `Yogq)G}  
 cKey=key; -c$z 2Q)  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 92(~'5Qr  
 return bRegistered; FrR9{YTA .  
} j7sU0"7^  
OPJgIU%  
  四、小结 C5B=NAc  
Dh8(HiXf:  
  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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