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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: \#6Fm_b] u  
  98=la,^$  
  一、实现方法 ?WFh',`:  
L`[z[p {?  
  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: 79BaDB`{a  
`.v(fC  
#pragma data_seg("shareddata") s| -FH X  
HHOOK hHook =NULL; //钩子句柄 ( u`W!{1\  
UINT nHookCount =0; //挂接的程序数目 HOZRYIQB  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ! '0S0a8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 >NM\TLET~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey s9j7Psd  
static int KeyCount =0; q p~g P  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 >/^#Drwb!i  
#pragma data_seg() ;t(f1rPyE  
qf8[!5GM  
  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。 S$[k Q|Am  
{{!Y]\2S  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: rU2iy"L  
I1"MPx{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR <Q5Le dN  
cKey,UCHAR cMask) =6T 4>rP  
{ Cifd21v4  
 BOOL bAdded=FALSE; ll<NIdf\r  
 for(int index=0;index<MAX_KEY;index++){ M1!pQC_9  
  if(hCallWnd[index]==0){ \Fb| {6+  
   hCallWnd[index]=hWnd; Qe$k3!  
   HotKey[index]=cKey; jH *)%n5,\  
   HotKeyMask[index]=cMask; Q8qz*v]{  
   bAdded=TRUE; =Ho"N`Qy  
   KeyCount++; lMifpK  
   break; h(' )"  
  } t"AzI8O  
 } lE5v-z? &|  
 return bAdded; ycr"Y|  
} XL5Es:"+?S  
//删除热键 0 f/.>1M=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %2l7Hmp4H  
{ @pza>^wk  
 BOOL bRemoved=FALSE; ${hz e<g  
 for(int index=0;index<MAX_KEY;index++){ {`"#yl6"  
  if(hCallWnd[index]==hWnd){ K :LL_,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ J5yidymrpW  
    hCallWnd[index]=NULL; 6}dR$*=  
    HotKey[index]=0; l]_=:)" ]  
    HotKeyMask[index]=0; )TmtSSS  
    bRemoved=TRUE; 3,eIB(  
    KeyCount--; q4 k@l  
    break; P0GeZ02]  
   } pa<qZZ  
  } #kmh:P  
 } _GoVx=t   
 return bRemoved; N{C;~'M2ce  
} H+C6[W=  
L;6.r3bL  
\%A%s*1  
  DLL中的钩子函数如下: xN0*8  
V H^AcO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) &KC!*}<tx  
{ XcfKx@l  
 BOOL bProcessed=FALSE; z2yJ#  
 if(HC_ACTION==nCode) =zg:aTMti  
 { X%{'<baR  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 2+"r~#K*  
   switch(wParam) JXU2CyMY  
   {  8E^@yZo{  
    case VK_MENU: jE/oA<^  
     MaskBits&=~ALTBIT; f [o%hCS  
     break; *r,b=8|  
    case VK_CONTROL: \f Lvw  
     MaskBits&=~CTRLBIT; r/:%}(7;  
     break; +cB&Mi5  
    case VK_SHIFT: >cR)?P/o  
     MaskBits&=~SHIFTBIT; k#JQxLy#  
     break; j 6)Y  
    default: //judge the key and send message bKbp?-]  
     break; 2#5,MP~r  
   } nCxAQ|P?  
   for(int index=0;index<MAX_KEY;index++){ C!x/ ^gw  
    if(hCallWnd[index]==NULL) E^Gg '1  
     continue; ?.bnIwQe  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HgRwi It  
    { gn1(4 o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;</Lf=+Vm  
     bProcessed=TRUE; eC`pnE  
    } ljJ>;g+  
   } m <k!^jp  
  } RDQ^dui  
  else if((lParam&0xc000ffff)==1){ //有键按下 6f%DpJ:$U  
   switch(wParam) %i0\1hhV<  
   { @xWdO,#  
    case VK_MENU: ,"?A2n-qO  
     MaskBits|=ALTBIT; KLQ!b,=q  
     break; 9IZu$-  
    case VK_CONTROL: QLq@u[A  
     MaskBits|=CTRLBIT; $1Nd_pD=  
     break; &jQ?v@|1c  
    case VK_SHIFT: h y-cG%f  
     MaskBits|=SHIFTBIT; &xS a7FY  
     break; 1yqoA *  
    default: //judge the key and send message ;3ft1  
     break; /CX VLl8~  
   } SW?p?<  
   for(int index=0;index<MAX_KEY;index++){ E l&h;N   
    if(hCallWnd[index]==NULL) .p6+l!"  
     continue; 9s$U%F6}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) & eZfQ27$  
    { Y:QD   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -=}3j&,\R  
     bProcessed=TRUE; 8g/F)~s^F  
    } : mGAt[Cc  
   } 7^e +  
  } UVu DQ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 )mcEQ-!b  
   for(int index=0;index<MAX_KEY;index++){ ^>$P)=O:v  
    if(hCallWnd[index]==NULL) ]F*3"y?)2  
     continue; ^HA %q8| n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `iG,H[t+j  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); VM=+afY5M  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 oR#:Nt X@  
   } o4^Fo p  
  } @e2}BhB2  
 } NY B[Zyp  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 12`_;[37  
} v> z@  
\ZXLX'-  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 7*H:Ob)9k  
x8#ODuH  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); SAv<&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `k{& /]  
Cpl;vQ  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ]`=X'fED  
quu*xJ;Ci  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \+PIe7f_  
{ =!MY4&YX  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) P>Qpv Sd_#  
 { %"$@%"8;3  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Yxd X#3  
  SaveBmp(); -p,x&h,p  
  return FALSE; dKhA$f~  
 } C*6S@4k  
 …… //其它处理及默认处理 IO$z%r7  
} ./-JbW  
}ynT2a#LU'  
J{"kw1Lu  
  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。 b!>\2DlyJ  
Vd9@Dy  
  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。 <eN R8(P  
2ef;NC.&n  
  二、编程步骤 [bQj,PZ&  
in%;Eqk  
  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"; PH4%R]{8{  
S[:xqzyDg  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; irBDGT~  
g^>#^rLU  
  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; v Y|!  
GR4?BuY,  
  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; H^%.=kf  
-`c :}m  
  5、 添加代码,编译运行程序。 Ju` [m  
kAzd8nJ'  
三、程序代码 } /^C|iS7  
 q" @  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL >um!Eo  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) VL( <  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ XR+3j/zEQ  
#if _MSC_VER > 1000 +FFG#6e  
#pragma once 4jm K].  
#endif // _MSC_VER > 1000 lT8\}hNI+  
#ifndef __AFXWIN_H__ E">T*ao  
#error include 'stdafx.h' before including this file for PCH L):U"M>]=  
#endif =v6*|  
#include "resource.h" // main symbols 5"Kx9n|  
class CHookApp : public CWinApp 5MxL*DB=b  
{ @$@mqHI}  
 public: p#8W#t$  
  CHookApp(); {==pZpyyh  
  // Overrides =(r* 5vd  
  // ClassWizard generated virtual function overrides fp>.Owt%.  
  //{{AFX_VIRTUAL(CHookApp) B)SLG]72f  
 public: vFmJ;J  
  virtual BOOL InitInstance(); "kW!{n  
  virtual int ExitInstance(); TJ@Cjy%  
  //}}AFX_VIRTUAL {OMg d3%14  
  //{{AFX_MSG(CHookApp) FcbM7/  
  // NOTE - the ClassWizard will add and remove member functions here. zri} h/{  
  // DO NOT EDIT what you see in these blocks of generated code ! /M0/-pV 9  
  //}}AFX_MSG B\`Aojw"E?  
  DECLARE_MESSAGE_MAP() zzpZ19"`1  
}; ^+70<#Xc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); " BTE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2-If]Fc  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]hw-Bu\{  
BOOL InitHotkey(); '{?C{MK3Q  
BOOL UnInit(); YhKZ|@  
#endif  NY  
MLVB^<qkeH  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. j#A%q"]8  
#include "stdafx.h" US&B!Q:v  
#include "hook.h" 3C>qh{z"  
#include <windowsx.h> JHV)ZOO  
#ifdef _DEBUG >O9 sk  
#define new DEBUG_NEW &rq{v!=7  
#undef THIS_FILE i\}:hU-U  
static char THIS_FILE[] = __FILE__; pR o s{Uq"  
#endif `|e!Kq?#Q  
#define MAX_KEY 100 #~ v4caNx  
#define CTRLBIT 0x04 H. ,;-  
#define ALTBIT 0x02 h=VqxGC&  
#define SHIFTBIT 0x01 =5]n\"/  
#pragma data_seg("shareddata") ?^!,vh  
HHOOK hHook =NULL; cL7g}$W $  
UINT nHookCount =0; aC=['a>)  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ~Vh=5J~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT &vUq}r%P  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Xh3;   
static int KeyCount =0; .#6MQJ]OH  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift w; TkkDH  
#pragma data_seg() NC23Z0y  
HINSTANCE hins; '%iPVHK7  
void VerifyWindow(); )6oGF>o>  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) hXL|22>w<  
//{{AFX_MSG_MAP(CHookApp) &K%aw  
// NOTE - the ClassWizard will add and remove mapping macros here. GY!C|7kN  
// DO NOT EDIT what you see in these blocks of generated code! h^|5|l  
//}}AFX_MSG_MAP Wsz0yHD[`  
END_MESSAGE_MAP()  .jg0a  
j.?:Gaab?#  
CHookApp::CHookApp() w_-+o^  
{ 2OBfHO~D  
 // TODO: add construction code here, m9$:9yRm  
 // Place all significant initialization in InitInstance D9ufoa&ua  
} #B}?Zg  
a=]W zlz  
CHookApp theApp; BR_TykP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) D#rrW?-z  
{ C*~aSl7  
 BOOL bProcessed=FALSE; )$M,Ul  
 if(HC_ACTION==nCode) 5mB]N%rfW%  
 { Gm8E<iTP  
  if((lParam&0xc0000000)==0xc0000000){// Key up pK_?}~  
   switch(wParam) 9(1rh9`=  
   { cgZaPw2 bw  
    case VK_MENU: D@54QJ<  
     MaskBits&=~ALTBIT; J\co1kO9/  
     break; iw]k5<qKj  
    case VK_CONTROL: f[~1<;|-  
     MaskBits&=~CTRLBIT; -E>)j\{PX7  
     break; lJ  
    case VK_SHIFT: HOW7cV'X  
     MaskBits&=~SHIFTBIT; .J.vC1 4gi  
     break; b[^{)$(  
    default: //judge the key and send message 6 vs3O  
     break; Utl t<  
   } loOOmHhJ&  
   for(int index=0;index<MAX_KEY;index++){ P_4DGW  
    if(hCallWnd[index]==NULL) Buc_9Kzw<+  
     continue; 19u =W(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UPh=+s #Q  
    { D,;\F,p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); +++pI.>(*Q  
     bProcessed=TRUE; 649 !=  
    } 4SVW/Zl.?  
   } Di(9]: +  
  } QJ X/7RA  
  else if((lParam&0xc000ffff)==1){ //Key down Cnh|D^{s  
   switch(wParam) ,Qc.;4s-  
   { 7XAvd-  
    case VK_MENU: HCnf2td  
     MaskBits|=ALTBIT; F9o6V|v  
     break; |m>}%{  
    case VK_CONTROL: mV\$q@sII  
     MaskBits|=CTRLBIT; e- 6w8*!i  
     break; #6> 6S;Ib  
    case VK_SHIFT: &y. dmW  
     MaskBits|=SHIFTBIT; a-0cN 9  
     break; %vqT#+x  
    default: //judge the key and send message [1Dm<G u@  
     break; MWwJzVL8  
   } nfE@R."A  
   for(int index=0;index<MAX_KEY;index++) _ n O.-  
   { 2<W&\D o@  
    if(hCallWnd[index]==NULL) HkjEiU  
     continue; 'p}`i/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dk5|@?pe  
    { G2Qjoe`Uc  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); DZ`k[Z.VZ  
     bProcessed=TRUE; ~l4f{uOD>]  
    } F8mC?fbK9  
   } &r_uQbx  
  } TUTe9;)  
  if(!bProcessed){ KCqqJ}G  
   for(int index=0;index<MAX_KEY;index++){ )2j:z#'>  
    if(hCallWnd[index]==NULL) bKz{wm%  
     continue; 3VO:+mT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \9m*(_Qf  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?Myh 7  
   } O.\h'3C  
  } @)0 Y~A )  
 } uH{'gd,q8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5w3Fqu>39?  
} mb1IQ &  
xy^1US ,L1  
BOOL InitHotkey() ,x#ztdvr  
{ McP.9v}H0_  
 if(hHook!=NULL){ "sbBe73 m  
  nHookCount++; 9D_wG\g  
  return TRUE; /tKGwX]y  
 } 1i-[+   
 else 5P+YK\~  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); v*TeTA %  
  if(hHook!=NULL) G}Z4g  
   nHookCount++; W<'<'z5  
  return (hHook!=NULL); i Ci>zJ  
} SGf9U^ds  
BOOL UnInit() P;U@y" s  
{ >4)g4~'n!  
 if(nHookCount>1){ YKx 1NC  
  nHookCount--; Jt=>-Spj  
  return TRUE; g9V.13k  
 } 5' \)`  
 BOOL unhooked = UnhookWindowsHookEx(hHook); uQp_':\k  
 if(unhooked==TRUE){ n<R \w''x  
  nHookCount=0; lX;mhJj!  
  hHook=NULL; eE3-t/=  
 } /$`;r2LG  
 return unhooked; .E<Dz  
} +TX/g~  
"iek,Y}j7  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z3;=w%W  
{ > V%Q O>C  
 BOOL bAdded=FALSE; h6QWH  
 for(int index=0;index<MAX_KEY;index++){ Vyt E  
  if(hCallWnd[index]==0){ |5ONFd e"0  
   hCallWnd[index]=hWnd; FdxsU DL  
   HotKey[index]=cKey; [x_s/"Md;  
   HotKeyMask[index]=cMask; rm|7 [mK  
   bAdded=TRUE; %V_eJC""?  
   KeyCount++; mw+j|{[  
   break; jT^!J+?6K+  
  } 0xP:9rm  
 } {hd-w4"115  
 return bAdded; OmNn,PCl8  
} -Enbcz(B  
I~RcOiL)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Phlk1*1n  
{ \(u@F<s-  
 BOOL bRemoved=FALSE; WOb8 "*OM  
 for(int index=0;index<MAX_KEY;index++){ # #>a&,  
  if(hCallWnd[index]==hWnd){ :~-i&KNk  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Xw(3j)xQ  
    hCallWnd[index]=NULL; 2f{kBD  
    HotKey[index]=0; AU`OESSI  
    HotKeyMask[index]=0; 7A0dl}:  
    bRemoved=TRUE; O5MDGg   
    KeyCount--; s`vSt* ]K  
    break; ITvHD-,\  
   } -tP.S1D  
  } |[WL2<  
 } Q X):T#^V  
 return bRemoved; ?!m m a\W  
} 8p,>y(o  
XGk}e4;_  
void VerifyWindow() Fwv\pJ}$  
{ y:9?P~  
 for(int i=0;i<MAX_KEY;i++){ nKu(XgFv  
  if(hCallWnd!=NULL){ %8<2>  
   if(!IsWindow(hCallWnd)){  ;MZbL)  
    hCallWnd=NULL; 1.dX)^\  
    HotKey=0; ZbyG*5iq  
    HotKeyMask=0; >w2f8tW`PP  
    KeyCount--; yk#rd~2Z0  
   } ~2 Oc K  
  } sD2Qm  
 } sH@  &*  
} Hn^sW LT  
]ut?&&*  
BOOL CHookApp::InitInstance() s((b"{fFb  
{ ">,K1:(D  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Ou!)1UFI  
 hins=AfxGetInstanceHandle(); kaC+I"4c  
 InitHotkey(); B[7A  
 return CWinApp::InitInstance(); FvA|1c  
} @7X\tV.Z  
QX+Y(P`vMK  
int CHookApp::ExitInstance() 'A1E^rl]=  
{ *vD/(&pQ1:  
 VerifyWindow(); E6Q91Wz9f  
 UnInit(); 0#]!#1utg  
 return CWinApp::ExitInstance(); 0STk)> 3$-  
} SZE`J:w  
4K'|DO|dH  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ZmP1C`>  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) o{g@Nk'f  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ VLx T"]f  
#if _MSC_VER > 1000 :SdIU36  
#pragma once C#T)@UxBZ  
#endif // _MSC_VER > 1000 .W-=x,`hY4  
pKYLAt+^>  
class CCaptureDlg : public CDialog BArJ"t*/z  
{ 3l+|&q[v  
 // Construction 0@w&J9yG  
 public: /rOnm=P+Q  
  BOOL bTray; rNxG0^k(  
  BOOL bRegistered; Uv'uqt  
  BOOL RegisterHotkey(); 9QZ}Hn`p  
  UCHAR cKey; 5@iy3olP  
  UCHAR cMask; Sn0Xl3yr  
  void DeleteIcon(); sB8p( L  
  void AddIcon(); %'kX"}N/  
  UINT nCount; epYj+T  
  void SaveBmp(); +O,V6XRr  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Ho>p ^p  
  // Dialog Data QdirE4W  
  //{{AFX_DATA(CCaptureDlg) x6jm -n  
  enum { IDD = IDD_CAPTURE_DIALOG }; (\tq<h0  
  CComboBox m_Key; 6\XP|n-0+0  
  BOOL m_bControl; WEps.]s  
  BOOL m_bAlt; }il%AAI9}r  
  BOOL m_bShift; cS5w +`,L  
  CString m_Path; ^`/V i  
  CString m_Number; "wF*O"WQo  
  //}}AFX_DATA Ag<4r  
  // ClassWizard generated virtual function overrides c.\:peDk  
  //{{AFX_VIRTUAL(CCaptureDlg) svF*@(- P#  
 public: EJv!tyJ\[  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ;+r0 O0;9  
 protected: rrbZ+*U  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support s~/57S  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ]m RF[b$  
  //}}AFX_VIRTUAL Fu#Y7)r  
  // Implementation +OKA_b"wB  
 protected: 1RmBtx\<  
  HICON m_hIcon; dPRtN@3  
  // Generated message map functions z=u~]:.1O  
  //{{AFX_MSG(CCaptureDlg) ^NcTWbs-T  
  virtual BOOL OnInitDialog(); l;XUh9RF`A  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); FU^Y{sbDg  
  afx_msg void OnPaint(); /Ql6]8.P  
  afx_msg HCURSOR OnQueryDragIcon(); VN?<[#ij  
  virtual void OnCancel(); $B*qNYpPy.  
  afx_msg void OnAbout(); HH+TjX/b  
  afx_msg void OnBrowse(); Qb@BV&^y&  
  afx_msg void OnChange(); NuHL5C?To  
 //}}AFX_MSG LZbRQ"!!o  
 DECLARE_MESSAGE_MAP() gq=0L:  
}; Ni&,g  
#endif Dy98[cL  
\]Kq(k[p  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file }'%$7vL`Ft  
#include "stdafx.h" kg zwlKK  
#include "Capture.h" Ua}g  
#include "CaptureDlg.h" K@I+]5E%?  
#include <windowsx.h> X5|?/aR}  
#pragma comment(lib,"hook.lib") n (9F:N  
#ifdef _DEBUG Lqg7D\7j  
#define new DEBUG_NEW w6%l8+{R  
#undef THIS_FILE 5/*)+  
static char THIS_FILE[] = __FILE__; %`bLmfm  
#endif ;<86P3S  
#define IDM_SHELL WM_USER+1 y>?k<)nA{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \XZU'JIO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _.u~)Q`6  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; \?aOExG I  
class CAboutDlg : public CDialog hg(KNvl  
{ c>M_?::)0  
 public: 4mki&\lw`  
  CAboutDlg(); ;]|m((15G  
  // Dialog Data BASO$?jf4  
  //{{AFX_DATA(CAboutDlg) N)`tI0/W  
  enum { IDD = IDD_ABOUTBOX }; ^Z#<tN;  
  //}}AFX_DATA ]%b0[7[  
  // ClassWizard generated virtual function overrides ?U7&R%Lh`  
  //{{AFX_VIRTUAL(CAboutDlg) n\~"Wim<b  
 protected: }S Y`KoC1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support a g|9$  
  //}}AFX_VIRTUAL Vjv6\;tt8  
  // Implementation t201ud2$  
 protected: hj%}GP{{  
  //{{AFX_MSG(CAboutDlg) %w;1*~bH  
  //}}AFX_MSG m~b#:4D3  
  DECLARE_MESSAGE_MAP() =f/avGX  
}; wCqE4i  
+3(CGNE  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) c`Lpqs`  
{ <h)deB+}  
 //{{AFX_DATA_INIT(CAboutDlg) G:H(IA7Z  
 //}}AFX_DATA_INIT <e@I1iL37y  
} ?14X8Mb8W_  
Fo--PtY`p  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ,Gf+U7'K  
{ I$rW[l2  
 CDialog::DoDataExchange(pDX); 5|{  t+u  
 //{{AFX_DATA_MAP(CAboutDlg) EfMG(oI  
 //}}AFX_DATA_MAP U`},)$  
} ',v0vyO8  
h9@gs,'   
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) p8 E;[  
 //{{AFX_MSG_MAP(CAboutDlg) Py(wT%w  
 // No message handlers sIP6GWK$  
 //}}AFX_MSG_MAP b@UF PE5jy  
END_MESSAGE_MAP() Iwd"f  
oZ|{J  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Xmw2$MCB  
: CDialog(CCaptureDlg::IDD, pParent) J~PTVR  
{ 0ll,V  
 //{{AFX_DATA_INIT(CCaptureDlg) NpjsZcA  
  m_bControl = FALSE; Br?++\  
  m_bAlt = FALSE; ~cWLu5  
  m_bShift = FALSE; cHfK-R  
  m_Path = _T("c:\\"); ]}*G[[ ^p  
  m_Number = _T("0 picture captured."); +LvZ87O^~  
  nCount=0; SV$ASs  
  bRegistered=FALSE; < :S?t2C  
  bTray=FALSE; r)*_,Fo|  
 //}}AFX_DATA_INIT mo97GW  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 C 6:pY-  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); <ZN) /,4PS  
} x %!OP\  
&QHA_+88W  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) m"k i*9]  
{ [m@e^6F0U  
 CDialog::DoDataExchange(pDX); 6M2i? c  
 //{{AFX_DATA_MAP(CCaptureDlg) Xlgz.j7XR  
  DDX_Control(pDX, IDC_KEY, m_Key); .-gm"lB  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); LQuYCfj|  
  DDX_Check(pDX, IDC_ALT, m_bAlt); o>!~*b';g,  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); (rCPr,@0  
  DDX_Text(pDX, IDC_PATH, m_Path); pD)/- Dgdm  
  DDX_Text(pDX, IDC_NUMBER, m_Number); W"DxIy  
 //}}AFX_DATA_MAP JN9HT0  
} lVO(9sl*i  
0o\=0bH&s  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) J0{WqA.P  
//{{AFX_MSG_MAP(CCaptureDlg) G/^5P5y%@  
 ON_WM_SYSCOMMAND() 'SXpb?CZ  
 ON_WM_PAINT() "1\RdTw  
 ON_WM_QUERYDRAGICON() /-cX(z 7  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) t2U]CI%  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) *PA1iNdKS  
 ON_BN_CLICKED(ID_CHANGE, OnChange) c9F[pfi(  
//}}AFX_MSG_MAP bC>yIjCTn  
END_MESSAGE_MAP() ~S~x@&yR  
mSqk[ Ig\  
BOOL CCaptureDlg::OnInitDialog() TbSt {TX  
{ ff2.| 20  
 CDialog::OnInitDialog(); kgib$t_7  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); FkkZyCqZ`  
 ASSERT(IDM_ABOUTBOX < 0xF000); #6#BSZ E  
 CMenu* pSysMenu = GetSystemMenu(FALSE); #gr+%=S'6C  
 if (pSysMenu != NULL) m/"=5*pA  
 { &dHm!b  
  CString strAboutMenu; 'FvhzGn9Q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); A1&>L9nUx  
  if (!strAboutMenu.IsEmpty()) 7Ohu$5\  
  { L< nkI  
   pSysMenu->AppendMenu(MF_SEPARATOR); A+Pm "|  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); :7AauoI  
  } mqfEs0~I  
 } D=Yag!1  
 SetIcon(m_hIcon, TRUE); // Set big icon Y_TL4  
 SetIcon(m_hIcon, FALSE); // Set small icon "#"Fp&Z7  
 m_Key.SetCurSel(0); e&VR>VJEA  
 RegisterHotkey(); 0zk T8'v  
 CMenu* pMenu=GetSystemMenu(FALSE); c&iK+qvh{  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 4FP~+  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); |'>E};D  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _S7M5{U_  
 return TRUE; // return TRUE unless you set the focus to a control clU3#8P!=  
} 9jJ/ RXp  
JCMEhI6d*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Z~.]ZWj -  
{ E;+OD&|  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 1Tk\n  
 { ?5+KHG*)  
  CAboutDlg dlgAbout; GF,|;)ly  
  dlgAbout.DoModal(); z jNjmC!W  
 } F<'l'AsC-  
 else c$UpR"+  
 { 3qd-,qC  
  CDialog::OnSysCommand(nID, lParam); Jb-QP'$@  
 } @=| b$E  
} ;),O*Z|"v  
0jx~_zq-j  
void CCaptureDlg::OnPaint() j7| \)x,  
{ uvc{RP  
 if (IsIconic()) <38@b ]+  
 { 7ump:|  
  CPaintDC dc(this); // device context for painting #j ~FA3O  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); jH#^O ;A  
  // Center icon in client rectangle NX #/1=  
  int cxIcon = GetSystemMetrics(SM_CXICON); 9G\3hL]  
  int cyIcon = GetSystemMetrics(SM_CYICON); >[3,qP]E  
  CRect rect; 88L bO(q\d  
  GetClientRect(&rect); OgpH{"  
  int x = (rect.Width() - cxIcon + 1) / 2; zk_hDhg&'  
  int y = (rect.Height() - cyIcon + 1) / 2; ~k< 31 ez  
  // Draw the icon E)Epr&9S  
  dc.DrawIcon(x, y, m_hIcon); )-:f;#xJ  
 } g5YsV p  
 else _WkcJe`  
 { 7Mb t*[n  
  CDialog::OnPaint(); >rX R;4%  
 } Nb, H8;  
} &_x/Dzu!z  
_nCs$ U  
HCURSOR CCaptureDlg::OnQueryDragIcon() j`&i4K:  
{ ^Ypx|-Vu!  
 return (HCURSOR) m_hIcon; +53zI|I  
} aGkVC*T  
1H@rNam&  
void CCaptureDlg::OnCancel() )jZ=/ xG  
{ lM]),}   
 if(bTray) 'C8=d(mR=m  
  DeleteIcon(); ,(Hmk(,  
  CDialog::OnCancel(); !`Yi{}1_  
} 9Q5P7}%p  
Nk~dfY<s  
void CCaptureDlg::OnAbout() wN0OAbtX'  
{ qc4 "0Ap'  
 CAboutDlg dlg; h+d;`7Z>  
 dlg.DoModal(); g.sV$.T2K  
} ^XB8A=xi  
Zkep7L   
void CCaptureDlg::OnBrowse() ] ,aAzjZ  
{ x!Y@31!Dy  
 CString str; @ tp7tB ;  
 BROWSEINFO bi; 8`?j*FV7kq  
 char name[MAX_PATH]; &1C9K>  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); )h!l%72  
 bi.hwndOwner=GetSafeHwnd(); Yt<PKs#E  
 bi.pszDisplayName=name; Y>m=cqR  
 bi.lpszTitle="Select folder"; 0mi[|~x=  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; lTd2~_  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); JF\viMfR  
 if(idl==NULL) 7%FZXsD  
  return; s5 'nWMo  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 5WN Z7cO  
 str.ReleaseBuffer(); ^"#rDP"v  
 m_Path=str; :NyEd<'  
 if(str.GetAt(str.GetLength()-1)!='\\') YD.^\E4o  
  m_Path+="\\"; :|mkI#P.  
 UpdateData(FALSE); :pu{3-n.  
} %hb5C 4q  
tLXw&hFk`g  
void CCaptureDlg::SaveBmp() 4'=N{.TtO  
{ \uPTk)oaB  
 CDC dc; `*!>79_2C  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); I*R$*/)  
 CBitmap bm; Oydmq,sVe(  
 int Width=GetSystemMetrics(SM_CXSCREEN); TmZ[?IL,  
 int Height=GetSystemMetrics(SM_CYSCREEN); oVsazYJ|?  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ,(=]6V  
 CDC tdc; d iLl>z  
 tdc.CreateCompatibleDC(&dc); lH>XIEj  
 CBitmap*pOld=tdc.SelectObject(&bm); nEEGO~e  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); RUtS_Z&  
 tdc.SelectObject(pOld); XFe7qt;%  
 BITMAP btm; pREY AZh  
 bm.GetBitmap(&btm); {4q:4 i  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Ax*~[$$~%  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); cb,sb^-  
 BITMAPINFOHEADER bih; zQ+t@;g1  
 bih.biBitCount=btm.bmBitsPixel; .O.R  
 bih.biClrImportant=0; q,&T$Tw  
 bih.biClrUsed=0; Y--8v#t  
 bih.biCompression=0; kw}1CXD  
 bih.biHeight=btm.bmHeight; 4^^rOi0  
 bih.biPlanes=1; jch8d(`?d  
 bih.biSize=sizeof(BITMAPINFOHEADER); eV%bJkt.  
 bih.biSizeImage=size; Y6PA\7Y\  
 bih.biWidth=btm.bmWidth; xJGeIh5  
 bih.biXPelsPerMeter=0; s@iCfXU  
 bih.biYPelsPerMeter=0; nv{4 U}&P  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); k|C8sSH  
 static int filecount=0; ,LO-!\L  
 CString name; B9-[wg#0G  
 name.Format("pict%04d.bmp",filecount++); ][1u:V/ U  
 name=m_Path+name; I,3!uogn  
 BITMAPFILEHEADER bfh; @&B!P3{f  
 bfh.bfReserved1=bfh.bfReserved2=0; ~l6Y<-!  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 9v2 ;  
 bfh.bfSize=54+size; A\.*+k/B  
 bfh.bfOffBits=54; !c($C   
 CFile bf; v |2j~  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ R!qrb26k  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); (W!$6+GT  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [0#hgGO]P  
  bf.WriteHuge(lpData,size); mhuaXbr  
  bf.Close(); ;VRR=p%,  
  nCount++; 5^/[]*  
 } mIo7 K5z{  
 GlobalFreePtr(lpData); W fNMyI  
 if(nCount==1) RBD MZ  
  m_Number.Format("%d picture captured.",nCount); 0z#kV}wE  
 else 9-6_:N>  
  m_Number.Format("%d pictures captured.",nCount); -"H4brj;G  
  UpdateData(FALSE);  O+j:L  
} eR`<9KBH  
N|S xAg  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) L|w-s4L  
{ _AbEQ\P{  
 if(pMsg -> message == WM_KEYDOWN) #wiP{+%b  
 { dhkpkt<G8  
  if(pMsg -> wParam == VK_ESCAPE) 4] 1a^@?  
   return TRUE; ii9/ UtIQ  
  if(pMsg -> wParam == VK_RETURN) ,+9r/}K]/  
   return TRUE;  gV kI=J  
 } uJ[Vv4N%9  
 return CDialog::PreTranslateMessage(pMsg); xrnH= >.;m  
} Y1\vt+`O  
0&@ pX~h:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) c<e\JJY5?  
{ $twF93u$  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %Ege^4PE  
  SaveBmp(); J7vpCw2ni  
  return FALSE; 3fTI&2:  
} $(=1A>40  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){  0 XzO`*  
 CMenu pop; -~f.>@Wb  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Y cpO;md  
 CMenu*pMenu=pop.GetSubMenu(0); 7bS[\5  
 pMenu->SetDefaultItem(ID_EXITICON); %m3efaC  
 CPoint pt; p> S/6 [X  
 GetCursorPos(&pt); 3PffQ,c[~  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Z+(V \  
 if(id==ID_EXITICON) xltu g##  
  DeleteIcon(); FG:BRS<m~  
 else if(id==ID_EXIT) ppKCY4  
  OnCancel(); zK?[dO  
 return FALSE; eS:e#>(  
} d2sq]Q  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); )xy6R]_b  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) y@_?3m7B=  
 AddIcon(); ~#\#!H7  
 return res; F JhVbAMd  
} !*6z=:J  
KL]!E ~i  
void CCaptureDlg::AddIcon() 4&fnu/,Z  
{ =i?,y +<  
 NOTIFYICONDATA data; v19`7qgR(  
 data.cbSize=sizeof(NOTIFYICONDATA); 2zu~#qU[)M  
 CString tip; d 4R+gIA  
 tip.LoadString(IDS_ICONTIP); ArK9E!`^  
 data.hIcon=GetIcon(0); uD5yw #`  
 data.hWnd=GetSafeHwnd(); wP?q5r5  
 strcpy(data.szTip,tip); |0p'p$%  
 data.uCallbackMessage=IDM_SHELL; #jiqRhm  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; yTiqG5r  
 data.uID=98; g1 ,  
 Shell_NotifyIcon(NIM_ADD,&data); )n@3@NV  
 ShowWindow(SW_HIDE); q(^J7M)  
 bTray=TRUE; MGDv4cFE.  
} /GGu` f  
TVwYFX  
void CCaptureDlg::DeleteIcon() "s9gQAoaO  
{ V}+;b bUc-  
 NOTIFYICONDATA data; 5&= n  
 data.cbSize=sizeof(NOTIFYICONDATA); m28w4   
 data.hWnd=GetSafeHwnd();  ?Nql7F4  
 data.uID=98; FoCkTp+/  
 Shell_NotifyIcon(NIM_DELETE,&data); %$| k3[4V  
 ShowWindow(SW_SHOW); ZRGZ'+hw  
 SetForegroundWindow(); Y3>\;W*?  
 ShowWindow(SW_SHOWNORMAL); # HYkzjb  
 bTray=FALSE; @8yFM%  
} !Jl0Eu  
e8<nP t`C  
void CCaptureDlg::OnChange() %tQ{Hf~  
{ >+8I =S  
 RegisterHotkey(); r0 C6Ww7u  
} _\PoZ|G4y  
E,yK` mPp^  
BOOL CCaptureDlg::RegisterHotkey() VTfaZ/e.  
{ L-{r*ccIW  
 UpdateData(); olh3 R.M<  
 UCHAR mask=0; #)}bUNc'  
 UCHAR key=0; t'x:fO?cp  
 if(m_bControl)  o f  
  mask|=4; DNBpIC5&6  
 if(m_bAlt) 'PYqp&gJ  
  mask|=2; w8I&:"^7<  
 if(m_bShift) |9Ks13?Ck  
  mask|=1; dvF48,kr  
  key=Key_Table[m_Key.GetCurSel()]; 9Ib(x0_  
 if(bRegistered){ FH`&C*/F0Y  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); m-92G8'  
  bRegistered=FALSE; q|l|mO  
 } UyKG$6F?3  
 cMask=mask; CT%m_lN  
 cKey=key; [:@?,?V\N  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $IZZ`Z]B  
 return bRegistered; 6 <S&~q  
} bKZ#>%|:o  
OUO^/] J1S  
  四、小结 G$uOk?R#5c  
}px]   
  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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