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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: >O9 sk  
  =Ov7C[(  
  一、实现方法 Do-^S:.  
{i{xo2<1"  
  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: #~ v4caNx  
H. ,;-  
#pragma data_seg("shareddata") [ .yJV`  
HHOOK hHook =NULL; //钩子句柄 =5]n\"/  
UINT nHookCount =0; //挂接的程序数目 ?^!,vh  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 3-Bl  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Y Z}cB  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey haSM=;uPM  
static int KeyCount =0; Z)< wv&K  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Q%ad q-B  
#pragma data_seg() n[+'OU[  
$ACx*e%  
  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。 "l~Ci7& !a  
GUp;AoQ  
  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}. +`vVO  
g$37;d3Tx  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ?s%v0cF  
cKey,UCHAR cMask) {+T/GBF-K=  
{ R'K/t|MC  
 BOOL bAdded=FALSE; lP<I|O=z  
 for(int index=0;index<MAX_KEY;index++){ I`B'1"{  
  if(hCallWnd[index]==0){ bi[7!VQf  
   hCallWnd[index]=hWnd; u</8w&!  
   HotKey[index]=cKey; BR_TykP  
   HotKeyMask[index]=cMask; B&KL2&Z~Pq  
   bAdded=TRUE; )$M,Ul  
   KeyCount++; Un=a fX?j  
   break; 1JS2SxF  
  } Pe7e ?79  
 } =yi OJyx  
 return bAdded; LK7Xw3  
} , |E$'  
//删除热键 v"6 \=@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5 9 2;W-y  
{ rGwIcx(%  
 BOOL bRemoved=FALSE; >l1 r,/\\  
 for(int index=0;index<MAX_KEY;index++){ S'i;xL>  
  if(hCallWnd[index]==hWnd){ kToOIx  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {ISE'GJj  
    hCallWnd[index]=NULL; I<\ '%  
    HotKey[index]=0; zQ)+/e(8  
    HotKeyMask[index]=0; (|h:h(C  
    bRemoved=TRUE; jZ9[=?   
    KeyCount--; lu\o`m5wF  
    break; ]KK`5Dv|,e  
   } I."p  
  } 0{rx.C7|  
 } hSV@TL  
 return bRemoved; 02b6s&L  
} a+z2Zd!u\x  
S3 \jcgrS  
E,"&-`/2v  
  DLL中的钩子函数如下: Epjff@ 7A  
@PkJY  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) vs9?+3  
{ H oy7RC&  
 BOOL bProcessed=FALSE; RIy\u >  
 if(HC_ACTION==nCode) r|Zi3+  
 { ]r"Yqv3  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Zr/r2  
   switch(wParam) 6SEltm(  
   {  yY=<'{!  
    case VK_MENU: c[(Pg%  
     MaskBits&=~ALTBIT; w9&#~k]5  
     break; RI.2F*|  
    case VK_CONTROL: ';YgG<u  
     MaskBits&=~CTRLBIT; D'i6",Z>  
     break; !$xu(D.  
    case VK_SHIFT: [?KIN_e#  
     MaskBits&=~SHIFTBIT; 'CV^M(o'9  
     break; @z,*K_AKr  
    default: //judge the key and send message KFhG(   
     break; wyQb5n2`;~  
   } oK+Lzb\d{M  
   for(int index=0;index<MAX_KEY;index++){ H'Qo\L4H  
    if(hCallWnd[index]==NULL) d]B= *7]  
     continue; Z6s5M{mE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \ aKd5@  
    { ?l6jG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); aC\4}i<  
     bProcessed=TRUE; NB)t7/Us  
    } :=!Mh}i  
   } DdjCn`jqlf  
  } YMzBAf  
  else if((lParam&0xc000ffff)==1){ //有键按下 Go8F5a@j  
   switch(wParam) BQrL7y  
   { F @SG((`  
    case VK_MENU: *@M3p}',M  
     MaskBits|=ALTBIT; %J P!{mqj  
     break; 3'#%c>_  
    case VK_CONTROL: 8 njuDl  
     MaskBits|=CTRLBIT; X#J6Umutm  
     break; L(o#4YH}>J  
    case VK_SHIFT: gA:TL{X0  
     MaskBits|=SHIFTBIT; JZx%J)  
     break; r_o<SH  
    default: //judge the key and send message 2P}I'4C-  
     break; |rPAC![=  
   } `BT^a =5  
   for(int index=0;index<MAX_KEY;index++){  )U98  
    if(hCallWnd[index]==NULL) ww,Z )m  
     continue; RaNeZhF>M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [MmM9J["  
    { L3c*LL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); d6b.zP  
     bProcessed=TRUE; ^Q2ZqAf^a  
    } -u6#-}S  
   } /bcY6b=:  
  } ixI:@#5wY  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 @YZ 4AC  
   for(int index=0;index<MAX_KEY;index++){ .E<Dz  
    if(hCallWnd[index]==NULL) +TX/g~  
     continue; *x,HnHT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >>V&yJ_  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); i^/54  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 "$@,n7 k  
   } \y~)jq:d"  
  } 42@a(#z(U  
 } ~ x`7)3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); vInFo.e[4  
} g!^J,e=  
In(NF#  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Mq+< mX7  
~3 @*7B5Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Czu1)y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *8-p7,D  
otnV-7)@  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: a<p %hY3  
+Jq`$+%C  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !; WbOnLP  
{ 1n3$V:00  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ~e^)q>Lb7(  
 { w2Kq(^?  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Bbs 0v6&,  
  SaveBmp(); [4gjC  
  return FALSE; r$DZkMue  
 } BE4\U_]a3  
 …… //其它处理及默认处理 x5vzPh`  
} uBRw>"c_*8  
6Ct0hk4  
C'<'7g4  
  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。 _3&/(B%H  
:uvc\|:s  
  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。 m/?h2McS  
~XQ$aRl&  
  二、编程步骤 8p,>y(o  
XGk}e4;_  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 32y[  
Zd XKI{b  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ` ,-STIh)  
x!+Z{x   
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; }200g_^  
ua:9`+Dff  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; m5qCq9Y  
_LsYMUe  
  5、 添加代码,编译运行程序。 L9J;8+ge  
gvr]]}h:O  
三、程序代码 ybYXD?  
am (#Fa  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL D(@SnI+  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) \E&thp  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Zh? V,39  
#if _MSC_VER > 1000 jrcc  
#pragma once Rk{$S"8S_  
#endif // _MSC_VER > 1000 @Yarz1  
#ifndef __AFXWIN_H__ `skH-lk,  
#error include 'stdafx.h' before including this file for PCH $w`veP  
#endif ck~ '`<7  
#include "resource.h" // main symbols =W |vOfy  
class CHookApp : public CWinApp /J.0s0 @  
{ (zEYpTp  
 public: Di])<V  
  CHookApp(); pLo;#e8'f  
  // Overrides m9I(TOw  
  // ClassWizard generated virtual function overrides f~iML5lG  
  //{{AFX_VIRTUAL(CHookApp) 1O4D+0@  
 public: wOM<X hZ  
  virtual BOOL InitInstance(); U,d2DAvt  
  virtual int ExitInstance(); v C-[#]<  
  //}}AFX_VIRTUAL 8E=vR 8  
  //{{AFX_MSG(CHookApp) `W="g6(  
  // NOTE - the ClassWizard will add and remove member functions here. oE5;|x3  
  // DO NOT EDIT what you see in these blocks of generated code ! }Fz!6F2w  
  //}}AFX_MSG CQ jV!d0j  
  DECLARE_MESSAGE_MAP() 30BR 0C  
}; !,R  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 8z0Hx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (E IRz>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i _8zjj7  
BOOL InitHotkey(); k3 /4Bt G/  
BOOL UnInit(); wvX"D0eVn  
#endif wH!}qz /  
Iw*C*%}[Z  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. A` =]RJ  
#include "stdafx.h" 4a1BGNI%SW  
#include "hook.h" v$Dh.y  
#include <windowsx.h> sI4QI\*4  
#ifdef _DEBUG wNbTM.@  
#define new DEBUG_NEW QdirE4W  
#undef THIS_FILE p>!1S  
static char THIS_FILE[] = __FILE__; 35}P0+  
#endif 6\XP|n-0+0  
#define MAX_KEY 100 a0)vvo=bz  
#define CTRLBIT 0x04 &!4( 0u  
#define ALTBIT 0x02 tRkrV]K  
#define SHIFTBIT 0x01 )v};C<  
#pragma data_seg("shareddata") Jfe~ ,cI  
HHOOK hHook =NULL; L#[HnsLp_  
UINT nHookCount =0; G1A$PR  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey R:BBF9sK?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT KZi+j#7O  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey H]U "+52h  
static int KeyCount =0; @ljZw(  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift U:J /\-  
#pragma data_seg() <kROH0+  
HINSTANCE hins; D . 77WjwQ  
void VerifyWindow(); F6~b#Jz&i  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) +$'e4EwqV  
//{{AFX_MSG_MAP(CHookApp) 7Y4%R`9H  
// NOTE - the ClassWizard will add and remove mapping macros here. p-a]"l+L  
// DO NOT EDIT what you see in these blocks of generated code! ]}5`7  
//}}AFX_MSG_MAP Q-:Ah:/  
END_MESSAGE_MAP() _AVy:~/  
+V6j`  
CHookApp::CHookApp() rknzo]N,  
{ Qz'O{f  
 // TODO: add construction code here, J&(  
 // Place all significant initialization in InitInstance EWSr@}2j .  
} ws#hhW3qK  
9'D8[p%  
CHookApp theApp; KX]-ll  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) R,uJK)m  
{ Wnb)*pPP  
 BOOL bProcessed=FALSE; hcj{%^p  
 if(HC_ACTION==nCode) {E3;r7  
 { }`#j;H$i  
  if((lParam&0xc0000000)==0xc0000000){// Key up ='KPT1dW*  
   switch(wParam) bn5"dxV  
   { :u,2" ]  
    case VK_MENU: -DA;KWYS  
     MaskBits&=~ALTBIT; HW^{;'kH~  
     break; jBT*~DyN z  
    case VK_CONTROL: o@Dk%LxP  
     MaskBits&=~CTRLBIT; 5/*)+  
     break; %`bLmfm  
    case VK_SHIFT: ;<86P3S  
     MaskBits&=~SHIFTBIT; y>?k<)nA{  
     break; ~_ (!}V  
    default: //judge the key and send message _.u~)Q`6  
     break; \?aOExG I  
   } % E<FB;h  
   for(int index=0;index<MAX_KEY;index++){ 3L%Y"4(mm  
    if(hCallWnd[index]==NULL) D "JMSL4r  
     continue; goG] WGVr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bDxPgb7N=  
    { fN~8L}!l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); +SP! R[a  
     bProcessed=TRUE; rjfc.l#v  
    } 7MR:X#2v>  
   } :k Rv  
  } pIk4V/ fy  
  else if((lParam&0xc000ffff)==1){ //Key down avF&F  
   switch(wParam) BF@m )w.v  
   { e,PQ)1  
    case VK_MENU: b=6ZdN1  
     MaskBits|=ALTBIT; f J,8g/f8  
     break; 8f5%xY$  
    case VK_CONTROL: 5;r({ J  
     MaskBits|=CTRLBIT; !.x=r  
     break; Y;~EcM  
    case VK_SHIFT: rCV$N&rK  
     MaskBits|=SHIFTBIT; LX&=uv%-^  
     break; !H2C9l:rd  
    default: //judge the key and send message '5&B~ 1&  
     break; Ut0qr kqF  
   } bvt-leA=  
   for(int index=0;index<MAX_KEY;index++) r>n8`W  
   { h5h-}qBA  
    if(hCallWnd[index]==NULL) N9~'P-V  
     continue; {FrHm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D_L'x"  
    { BN bb&]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); UFSEobhg&5  
     bProcessed=TRUE; kW*W4{Fth  
    } 3?-V>-[G_  
   } b@UF PE5jy  
  } Iwd"f  
  if(!bProcessed){ oZ|{J  
   for(int index=0;index<MAX_KEY;index++){ Xmw2$MCB  
    if(hCallWnd[index]==NULL) #)Id J]  
     continue; f?oI'5R41  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) L>|A6S#y8/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); fh/)di  
   } 6PVlZ  
  } 4jI*Y6Wkz  
 } 4kN:=g  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); D(W7O>5vQ2  
} 7]0\[9DyJ  
:{e`$kz  
BOOL InitHotkey() tFb|y+  
{ 2l;ge>D J  
 if(hHook!=NULL){ LS?` {E   
  nHookCount++; 0:nt#n~_  
  return TRUE; u!156X?[eU  
 } IrVM|8vT3  
 else vwSX$OZ  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Fp* &os  
  if(hHook!=NULL) Av\ 0GqF  
   nHookCount++; HvL9;^!  
  return (hHook!=NULL); *>R/(Q  
} eFeCS{LV+  
BOOL UnInit() 'JXN*YO  
{ ?j ;,q  
 if(nHookCount>1){ @5 POgQ8  
  nHookCount--; [K^q: 3R  
  return TRUE; `s]zk {x  
 } P-*R N   
 BOOL unhooked = UnhookWindowsHookEx(hHook); FZLzu  
 if(unhooked==TRUE){ xfZ9&g  
  nHookCount=0; J^e|"0d  
  hHook=NULL; "1\RdTw  
 } /-cX(z 7  
 return unhooked; t2U]CI%  
} *PA1iNdKS  
+b:h5,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) wHDF TIDI  
{ vFkyfX(   
 BOOL bAdded=FALSE; ^Ypb"Wx8  
 for(int index=0;index<MAX_KEY;index++){ _@}MGWlAPt  
  if(hCallWnd[index]==0){ <CdG[Ih  
   hCallWnd[index]=hWnd; RaJ }>e  
   HotKey[index]=cKey; FkkZyCqZ`  
   HotKeyMask[index]=cMask; #6#BSZ E  
   bAdded=TRUE; #gr+%=S'6C  
   KeyCount++; m/"=5*pA  
   break; [~&:`I1  
  } pu m9x)y1  
 }  s`{#[&[  
 return bAdded; {mq$W  
} )l81R  
2+hfbFu,1  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) J0Rz.=Y  
{ ps4Wwk(  
 BOOL bRemoved=FALSE; B[k+#YYY  
 for(int index=0;index<MAX_KEY;index++){ AF{7<v>/P  
  if(hCallWnd[index]==hWnd){ DdA}A>47  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ q=L* 99S  
    hCallWnd[index]=NULL; T[2f6[#[_  
    HotKey[index]=0; B3k],k  
    HotKeyMask[index]=0; `qy6 qKl N  
    bRemoved=TRUE; ~dX@5+Gd  
    KeyCount--; NU 6Kh7  
    break; 4N^Qd3[d  
   } :j50]zLy{  
  } hghto \G5Y  
 } x%Y a*T  
 return bRemoved; DqC}f#  
} `W;cft4  
E* DVQ3~  
void VerifyWindow() wh[:wE]eX  
{ [Z`:1_^0}  
 for(int i=0;i<MAX_KEY;i++){ qCFXaj   
  if(hCallWnd!=NULL){ I}CA-8  
   if(!IsWindow(hCallWnd)){ ():?FJ M  
    hCallWnd=NULL; 5In8VE !P  
    HotKey=0; GzE3B';g  
    HotKeyMask=0; vd X~E97  
    KeyCount--; D_;n4<|.  
   } ]> "/<"  
  } kl<B*:RqH  
 } x;b+gIz*  
} f4;8?  
7)5$1  
BOOL CHookApp::InitInstance() 5@r Zm4U  
{ U=<.P;+f9  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); -W"0,.Dvg  
 hins=AfxGetInstanceHandle(); "a_D]D(d5  
 InitHotkey(); i1H80m s  
 return CWinApp::InitInstance(); QcVtv7+*v  
} N[D\@o  
o[+|n[aT)3  
int CHookApp::ExitInstance() V5^b6$R@  
{ :FgRe,D  
 VerifyWindow(); ,0u0 '  
 UnInit(); R~?;KJ  
 return CWinApp::ExitInstance(); CjukD%>sde  
} oL/^[TXjH  
XjM)/-w  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file NGeeD?2~  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) rH_:7#.E  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Ej3hdi)  
#if _MSC_VER > 1000 >^)5N<t?  
#pragma once ,(Hmk(,  
#endif // _MSC_VER > 1000 .2-JV0  
8@*|T?r  
class CCaptureDlg : public CDialog 9^h%}>  
{ pD.@&J~  
 // Construction wk 7_(gT`0  
 public: >+LgJo R  
  BOOL bTray; v\tbf  
  BOOL bRegistered; :^L]Da3  
  BOOL RegisterHotkey(); ^%/5-0?xE  
  UCHAR cKey; &1C9K>  
  UCHAR cMask; aC6b})^  
  void DeleteIcon(); l,2z5p  
  void AddIcon(); V.[#$ip6:  
  UINT nCount; '{*>hj5.8  
  void SaveBmp(); P T.jR*  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor y!D`.'  
  // Dialog Data -"tgEC\tD  
  //{{AFX_DATA(CCaptureDlg) PKs%-Uk  
  enum { IDD = IDD_CAPTURE_DIALOG }; e{+{,g{iu  
  CComboBox m_Key; e*Med)tc^$  
  BOOL m_bControl; g>-[-z$E3  
  BOOL m_bAlt; NS~knR\&  
  BOOL m_bShift; .qPfi] ty  
  CString m_Path; d*(\'6?  
  CString m_Number; n^)9QQ  
  //}}AFX_DATA R}26"+~  
  // ClassWizard generated virtual function overrides TmZ[?IL,  
  //{{AFX_VIRTUAL(CCaptureDlg) !27]1%Aw  
 public: 9>>}-;$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); io'Ovhf:  
 protected: Oo .Qz   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~ b_gwJ'  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); #iDFGkK/  
  //}}AFX_VIRTUAL ! HC<aWb  
  // Implementation JU.%;e7  
 protected: 'U0I.x(  
  HICON m_hIcon; 3 pH` ]m2  
  // Generated message map functions A:J{  
  //{{AFX_MSG(CCaptureDlg) Xkm2C)  
  virtual BOOL OnInitDialog(); -d)n0)9  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !QspmCo+  
  afx_msg void OnPaint(); dkp[?f)x  
  afx_msg HCURSOR OnQueryDragIcon(); -{%''(G  
  virtual void OnCancel(); sB/s17ar  
  afx_msg void OnAbout(); Y"%o\DS*  
  afx_msg void OnBrowse(); k|C8sSH  
  afx_msg void OnChange(); qE:DJy <  
 //}}AFX_MSG l!` 0I] }  
 DECLARE_MESSAGE_MAP() @&B!P3{f  
}; 9?c^~77  
#endif mnj A8@1  
wO%:WL$5  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ]w_)Spo.  
#include "stdafx.h" ,O!aRvzap  
#include "Capture.h" [0#hgGO]P  
#include "CaptureDlg.h" uy:=V }p  
#include <windowsx.h> KHN ,SB  
#pragma comment(lib,"hook.lib") }O  
#ifdef _DEBUG l$9,  
#define new DEBUG_NEW jy2nn:1#^  
#undef THIS_FILE +}/!yQtH  
static char THIS_FILE[] = __FILE__; 59]9-1" +  
#endif [ 1GEe  
#define IDM_SHELL WM_USER+1 J,Ap9HJt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;P~S/j[ 8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q>yt O'v1  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; .Tv(1HAc2l  
class CAboutDlg : public CDialog 9#6/c  
{ #Q7$I.O]  
 public: V5 r7eC  
  CAboutDlg(); 6Qu*'  
  // Dialog Data FM[To  
  //{{AFX_DATA(CAboutDlg) RY< b]|  
  enum { IDD = IDD_ABOUTBOX }; Uk6!Sb  
  //}}AFX_DATA )&Bv\Tfjt  
  // ClassWizard generated virtual function overrides o |iLBh$)  
  //{{AFX_VIRTUAL(CAboutDlg) ulM&kw.4i  
 protected: ;~1JbP  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support F k;su,]_  
  //}}AFX_VIRTUAL CF_!{X_k}  
  // Implementation n#cN[C9  
 protected: QovC*1'  
  //{{AFX_MSG(CAboutDlg) s\!vko'M  
  //}}AFX_MSG q:^Cw8  
  DECLARE_MESSAGE_MAP() >IjLFM+U  
}; Ghc0{M<  
T%/w^27E  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) hM w`e  
{ o+TZUMm  
 //{{AFX_DATA_INIT(CAboutDlg) ,eCXT=6  
 //}}AFX_DATA_INIT @D=`iG%  
} hh&y2#Io  
$uhDBmb  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) zK?[dO  
{ eS:e#>(  
 CDialog::DoDataExchange(pDX); d2sq]Q  
 //{{AFX_DATA_MAP(CAboutDlg) )xy6R]_b  
 //}}AFX_DATA_MAP y@_?3m7B=  
} ~#\#!H7  
F JhVbAMd  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) UULL:vqq  
 //{{AFX_MSG_MAP(CAboutDlg) \ 6 a  
 // No message handlers 9YhsJ~"Q  
 //}}AFX_MSG_MAP 8$Yf#;m[  
END_MESSAGE_MAP() 9zd/5|W  
D[M?27  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Iq \oB  
: CDialog(CCaptureDlg::IDD, pParent) >~~\==".  
{ f4}6$>)  
 //{{AFX_DATA_INIT(CCaptureDlg) K~T\q_ZPZ  
  m_bControl = FALSE; _xt(II   
  m_bAlt = FALSE; ku8c)  
  m_bShift = FALSE; S '+"+%^tj  
  m_Path = _T("c:\\"); k1zt|  
  m_Number = _T("0 picture captured."); ]5/U}Um  
  nCount=0; GJPZ[bo  
  bRegistered=FALSE; qCN7i&k,  
  bTray=FALSE; BxYA[#fd}  
 //}}AFX_DATA_INIT =lQ[%&  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 5AU3s  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); bz]O(`  
} }4%)m  
\}NWR{=  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) l&xD3u^G  
{ Pc== ]H(  
 CDialog::DoDataExchange(pDX); :j4 [_9\  
 //{{AFX_DATA_MAP(CCaptureDlg) uF"`y&go  
  DDX_Control(pDX, IDC_KEY, m_Key); W=]",<  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); z-gG(  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ZNeqsN{  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); \;gt&*$-  
  DDX_Text(pDX, IDC_PATH, m_Path); pUGfm  
  DDX_Text(pDX, IDC_NUMBER, m_Number); IQ~7vk()  
 //}}AFX_DATA_MAP mkzk$_  
} =A 6O}0z  
%=y3  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) X{9o8 *V  
//{{AFX_MSG_MAP(CCaptureDlg) /j@ `aG(a  
 ON_WM_SYSCOMMAND() !5t 3Y  
 ON_WM_PAINT() 4{t$M}?N  
 ON_WM_QUERYDRAGICON() 2tm-:CPG  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) @A'1D@f#  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) w8I&:"^7<  
 ON_BN_CLICKED(ID_CHANGE, OnChange) N o\&~  
//}}AFX_MSG_MAP j88sE MZ  
END_MESSAGE_MAP() Fxx2vTV4ag  
/+O8A}  
BOOL CCaptureDlg::OnInitDialog() 15DK \_;  
{ b)^ZiRW``  
 CDialog::OnInitDialog(); u?Mu*r?  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); $OoN/^kv  
 ASSERT(IDM_ABOUTBOX < 0xF000); ld:alEo  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ~ O=|v/]  
 if (pSysMenu != NULL) 6'! {0 5=m  
 { =2)t1 H  
  CString strAboutMenu; s/H"Ab  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 3eP0v  
  if (!strAboutMenu.IsEmpty()) W+C_=7_  
  { 8;&S9'ci  
   pSysMenu->AppendMenu(MF_SEPARATOR); {bqKb=nyZ  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); x]cZm^  
  } 8lSn*;S,  
 } /C2f;h(1  
 SetIcon(m_hIcon, TRUE); // Set big icon WTs[Sud/  
 SetIcon(m_hIcon, FALSE); // Set small icon G11.6]?Gg  
 m_Key.SetCurSel(0); _x1[$A,GuB  
 RegisterHotkey(); Al=? j#J6p  
 CMenu* pMenu=GetSystemMenu(FALSE); y@\Q@ 9  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ?QT"sj64w  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); HTyF<K  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ! H=k7s  
 return TRUE; // return TRUE unless you set the focus to a control .|`=mx  
} >=:T ZU  
QF/u^|f  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) f,inQ2f}d  
{ UZXcKl>u  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 8'WMspX  
 { f<altz_\q  
  CAboutDlg dlgAbout; C_ZD<UPA\  
  dlgAbout.DoModal(); H-KwkH`L4  
 } `G0rF\[  
 else @"Fp;Je\bN  
 { w[oQ}5?9'  
  CDialog::OnSysCommand(nID, lParam); P`I G9  
 } dN/ "1%9)  
} l~!fQ$~  
C!k9JAa$Z  
void CCaptureDlg::OnPaint() yZ)aKwj%U  
{ |abst&yp  
 if (IsIconic()) U3+ _'"  
 { <i\zfa'6  
  CPaintDC dc(this); // device context for painting 'Mx K}9  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 7r[ %| :  
  // Center icon in client rectangle  `pd   
  int cxIcon = GetSystemMetrics(SM_CXICON); GKujDx+h  
  int cyIcon = GetSystemMetrics(SM_CYICON); jl-Aos"/  
  CRect rect; JBEgiQ/  
  GetClientRect(&rect); W%9K5(e  
  int x = (rect.Width() - cxIcon + 1) / 2; zo7XmUI3P  
  int y = (rect.Height() - cyIcon + 1) / 2; mQ60@_"Y=,  
  // Draw the icon \i;&@Kp.N  
  dc.DrawIcon(x, y, m_hIcon); 6`baQ!xc.  
 } 6Vbv$ AU  
 else >{qK ]xj  
 { 0 ij~e<  
  CDialog::OnPaint(); 0"qim0%|DF  
 } /\a]S:V-j  
} Zjic"E1  
~{,vg4L  
HCURSOR CCaptureDlg::OnQueryDragIcon() }8F$& AFt  
{ Lr?4Y  
 return (HCURSOR) m_hIcon; K l0tyeT  
} >6l;/J  
VXc+Wm*W  
void CCaptureDlg::OnCancel() -Xxu/U})%  
{ <\d|=>;  
 if(bTray) *&dW\fx  
  DeleteIcon(); q]i(CaKh  
  CDialog::OnCancel(); P 5qa:<  
} 9oz(=R  
,D@ ;i  
void CCaptureDlg::OnAbout() f5yux}A{  
{ |;.Pj 3)-  
 CAboutDlg dlg; q 5v?`c  
 dlg.DoModal(); &<w[4z\  
} JXLWRe  
k BiBXRt  
void CCaptureDlg::OnBrowse() l'7Mw%6{  
{ *L;pcg8{  
 CString str; Q%n{*py  
 BROWSEINFO bi; k$-~_^4m  
 char name[MAX_PATH]; \n*7# aX/  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); U!\2K~  
 bi.hwndOwner=GetSafeHwnd(); Dz8:; $/  
 bi.pszDisplayName=name; xjK_zO*dLq  
 bi.lpszTitle="Select folder"; ^#BGA|j  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; % L >#  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); "0'*q<8  
 if(idl==NULL) x>^3]m  
  return; &vFqe,Z  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Kl aZZJ  
 str.ReleaseBuffer(); ]/o12pI  
 m_Path=str; Jny)uo8  
 if(str.GetAt(str.GetLength()-1)!='\\') Q$fRi[/L  
  m_Path+="\\"; *TM;trfz  
 UpdateData(FALSE); ksu}+i,a  
} '6o`^u>  
4z9#M;q T  
void CCaptureDlg::SaveBmp() c:llOHA  
{ =CjNtD2]  
 CDC dc; &}nBenYp  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); !]rETP_  
 CBitmap bm; pF sCd"zv  
 int Width=GetSystemMetrics(SM_CXSCREEN); f8LrDR  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5 PGlR!^  
 bm.CreateCompatibleBitmap(&dc,Width,Height); dSe8vA!)  
 CDC tdc; r:c@17  
 tdc.CreateCompatibleDC(&dc); '_.q_Tf-^  
 CBitmap*pOld=tdc.SelectObject(&bm); Qst \b8,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); =&q-[JW  
 tdc.SelectObject(pOld); FJ{,=@  
 BITMAP btm; n^iNo  
 bm.GetBitmap(&btm); Np|'7D  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; .# 6n  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); JO2ZS6k[  
 BITMAPINFOHEADER bih; 7b&JX'`Mb  
 bih.biBitCount=btm.bmBitsPixel; G`]v_`>  
 bih.biClrImportant=0; x)ddRq l  
 bih.biClrUsed=0; |*tWF! D6`  
 bih.biCompression=0; la\zaKC;>  
 bih.biHeight=btm.bmHeight; xS;|j j9  
 bih.biPlanes=1; OU,PO2xX9  
 bih.biSize=sizeof(BITMAPINFOHEADER); 29Gwv  
 bih.biSizeImage=size; ~!]&>n;=G  
 bih.biWidth=btm.bmWidth; D!bKm[T  
 bih.biXPelsPerMeter=0; n+{HNr  
 bih.biYPelsPerMeter=0; ~K~b`|1  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); qIbg 4uE  
 static int filecount=0; rU=b?D)n!w  
 CString name; (C`FicY  
 name.Format("pict%04d.bmp",filecount++); O{k89{  
 name=m_Path+name; [=F>#8=  
 BITMAPFILEHEADER bfh; W.,% 0cZ  
 bfh.bfReserved1=bfh.bfReserved2=0; 1R=)17'O  
 bfh.bfType=((WORD)('M'<< 8)|'B'); TL},Unq  
 bfh.bfSize=54+size; PIZ C;K4|  
 bfh.bfOffBits=54; CM%|pB/z  
 CFile bf; `Yx-~y5X  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ E?30J3S  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); _tWJXv~;  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0U82f1ei  
  bf.WriteHuge(lpData,size); ~ X-)_zH  
  bf.Close(); =n@F$/h  
  nCount++; L`9TB"0R+  
 } UL86-R!  
 GlobalFreePtr(lpData);  L5"8G,I  
 if(nCount==1) '[Mlmgc5  
  m_Number.Format("%d picture captured.",nCount); #yW.o'S+  
 else YfE>Pn'r  
  m_Number.Format("%d pictures captured.",nCount); $[Tt#CJ w  
  UpdateData(FALSE); zRwb"  
} `]*%:NZP@  
t)-*.qZh  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 51I|0 ly  
{ ;mDM5.iF  
 if(pMsg -> message == WM_KEYDOWN) i 8l./Yt/  
 { XB0a dp  
  if(pMsg -> wParam == VK_ESCAPE) &|v{#,ymeb  
   return TRUE; PX;Vo~6  
  if(pMsg -> wParam == VK_RETURN) 3/X-Cr+d  
   return TRUE; `J72+RA  
 } wgCvD  
 return CDialog::PreTranslateMessage(pMsg); w3^NL(>  
} 6!P`XTTE  
KK?Zm_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9mam ~)_ |  
{ r& vFikIz  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ IQ ){(Y  
  SaveBmp(); nD7|8,'  
  return FALSE; NF6X- ,c d  
} yJ%t^ X_  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <&4nOt  
 CMenu pop; 9 |' |BC  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); mDE'<c`b4  
 CMenu*pMenu=pop.GetSubMenu(0); "r u]?{v  
 pMenu->SetDefaultItem(ID_EXITICON); /:bKqAz;M  
 CPoint pt; e# t3u_  
 GetCursorPos(&pt); {vs 4vS6  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); C\ tprnY  
 if(id==ID_EXITICON) k!5m@'f  
  DeleteIcon(); /\ytr%7,'  
 else if(id==ID_EXIT) &~RR&MdZ2  
  OnCancel(); 4|`Yz%'  
 return FALSE; bF*NWm$Lf  
} |+>uA[6#  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); {3VZ3i  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) pD"YNlB^  
 AddIcon(); /D]Kkm)  
 return res; *c{wtl@  
} J^ `hbP+2  
8O>}k  
void CCaptureDlg::AddIcon() !<&m]K  
{ *n8%F9F  
 NOTIFYICONDATA data; 7W"/ N#G  
 data.cbSize=sizeof(NOTIFYICONDATA); x<)G( Xe*  
 CString tip;  >1A*MP4  
 tip.LoadString(IDS_ICONTIP); _5mc('  
 data.hIcon=GetIcon(0); f\fdg].!  
 data.hWnd=GetSafeHwnd(); |'tW=  
 strcpy(data.szTip,tip); @5WgqB  
 data.uCallbackMessage=IDM_SHELL; r!7Y'|  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 3{KR {B#L  
 data.uID=98; ] /+D^6  
 Shell_NotifyIcon(NIM_ADD,&data); %?bcT[|3  
 ShowWindow(SW_HIDE); u_PuqRcs  
 bTray=TRUE; 0n.S,3|  
} P.djd$#  
QdQ d(4/1  
void CCaptureDlg::DeleteIcon() f;gZ|a  
{ I]h-\;96  
 NOTIFYICONDATA data; petW M@  
 data.cbSize=sizeof(NOTIFYICONDATA); n"6;\  
 data.hWnd=GetSafeHwnd(); 2#3^skj  
 data.uID=98; v!H:^!z  
 Shell_NotifyIcon(NIM_DELETE,&data); 7 {f_fkbs  
 ShowWindow(SW_SHOW); [*)Z!)  
 SetForegroundWindow(); ZPHXzi3j  
 ShowWindow(SW_SHOWNORMAL); btH _HE  
 bTray=FALSE; c"7j3/p  
} V  }>n  
RsW9:*R  
void CCaptureDlg::OnChange() Rs*v m  
{ $<|ocUC7  
 RegisterHotkey(); X eoJ$PfT  
} 9XX>A*  
K^zDNIQU  
BOOL CCaptureDlg::RegisterHotkey() 6"U8V ?E  
{ -I":Z2.fR  
 UpdateData(); *:_P8G;  
 UCHAR mask=0; Q/ZkW  
 UCHAR key=0; ubYG  
 if(m_bControl) DdSSd@,x*  
  mask|=4; |9Yi7.  
 if(m_bAlt) `Gd$:qV  
  mask|=2; !g>.i`  
 if(m_bShift) ]u#JuX  
  mask|=1; &.Q8Mi aT  
  key=Key_Table[m_Key.GetCurSel()]; ymWgf 6r<  
 if(bRegistered){ y,=du  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); &3Z?UhH  
  bRegistered=FALSE; <*|?x86~  
 } #`;/KNp 9  
 cMask=mask; WZZ4]cC  
 cKey=key; 1zftrX~v!X  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ~9=aT1S|  
 return bRegistered; w8iR|TV  
} @*MC/fe  
FB:<zmwR  
  四、小结 %+-C3\'  
{f/]5x(_  
  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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