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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: jO=*:{#x  
  %4,xx'`  
  一、实现方法 U 2bzUxK  
qYK4)JP  
  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: ^00{Hd6  
EJ`Q8uz  
#pragma data_seg("shareddata") t)} \9^Uo  
HHOOK hHook =NULL; //钩子句柄 Axlm<3<wf"  
UINT nHookCount =0; //挂接的程序数目 )Ob]T{GY  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 kae2 73"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ]BfS270  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey L?8^aG  
static int KeyCount =0; %%&e"&7HE  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 s O=4IBE  
#pragma data_seg() ll%G!VR  
Rv<L#!; t  
  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。 gXt O*Rfqk  
KnJx{8@z  
  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: 3htq[Ren  
G=|70pxU  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR .#0H{mk  
cKey,UCHAR cMask) ox[ .)v  
{ @ .gPJMA  
 BOOL bAdded=FALSE; -(9O6)Rs$  
 for(int index=0;index<MAX_KEY;index++){ L6+C]t}>6  
  if(hCallWnd[index]==0){ V.8%|-d  
   hCallWnd[index]=hWnd; P`EgA  
   HotKey[index]=cKey; 0 _A23.Y  
   HotKeyMask[index]=cMask; &cc9}V)M  
   bAdded=TRUE; (9]6bd  
   KeyCount++; 4z_n4=  
   break; :H?f*aw  
  } 'w.}2(  
 }  q>-R3HB  
 return bAdded; r+S;B[Vd  
} `*aBRwvK~  
//删除热键 ;1`!wG-DD  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =u=Kw R  
{ ?v4E<iXs  
 BOOL bRemoved=FALSE; {q,?<zBzu  
 for(int index=0;index<MAX_KEY;index++){ 1`JB)9P  
  if(hCallWnd[index]==hWnd){ 5/?P|T   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $7NCb7%/L  
    hCallWnd[index]=NULL; `\N]wlB2/b  
    HotKey[index]=0; 3z3_7XI  
    HotKeyMask[index]=0; Nqc p1J"  
    bRemoved=TRUE; #!})3_Qc(y  
    KeyCount--; % 5z gd>  
    break; uv]{1S{tb  
   } w2OsLi Sv  
  } l5k?De_(x  
 } O~PChUU*Y  
 return bRemoved; %(<(Y  
} -bS)=L  
-Sz_mr  
gn)R^  
  DLL中的钩子函数如下: {DwIjy31T  
BpH%STEN  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) g jxS  
{ yMxTfR  
 BOOL bProcessed=FALSE; TH4\HY9qa?  
 if(HC_ACTION==nCode) GeV+/^u  
 { OJ1tV% E  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 H0>yi[2f  
   switch(wParam) m Ni2b*k  
   {  0<.R A%dj  
    case VK_MENU: ,T|x)"uA`  
     MaskBits&=~ALTBIT; x2W#ROfg  
     break; (3;@^S4&w  
    case VK_CONTROL: +Gh7^v|"  
     MaskBits&=~CTRLBIT; kOjf #@c  
     break; UyiJU~r1  
    case VK_SHIFT: -RMi8{  
     MaskBits&=~SHIFTBIT; q0./O|Dj   
     break; =Op+v"  
    default: //judge the key and send message "2{%JFE  
     break; 9Ah[rK*}  
   } ;ME)Og  
   for(int index=0;index<MAX_KEY;index++){ tFM$#JN  
    if(hCallWnd[index]==NULL) I g \#f  
     continue; wC CV2tk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +Xy*?5E;C  
    { PsnGXcj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); sKL:p3r  
     bProcessed=TRUE; ;Ii1B{W  
    } QDTNx!WL  
   } +L%IG  
  } Hd &{d+B  
  else if((lParam&0xc000ffff)==1){ //有键按下 XP3x Jm3  
   switch(wParam) [L(h G a  
   { :50b8  
    case VK_MENU: ?LP9iY${  
     MaskBits|=ALTBIT; BRv x[u  
     break; 9 OT,TpA  
    case VK_CONTROL: Or0O/\D)  
     MaskBits|=CTRLBIT; c#cx>wq9  
     break; T!|=El>  
    case VK_SHIFT: 09h.1/  
     MaskBits|=SHIFTBIT; )rtomp:X  
     break; Vba.uKNjk  
    default: //judge the key and send message /4irAG% Oj  
     break; |E)aT#$f'  
   } =#xK=pRy;  
   for(int index=0;index<MAX_KEY;index++){ o{WyQ&2N  
    if(hCallWnd[index]==NULL) HM9fjl[  
     continue; y2|R.EU\m<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y~ rX l  
    { V 9;[M;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); @It>*B yB.  
     bProcessed=TRUE; s:>\/[*>0c  
    } bPbb\|u0d  
   } 1iBP,:>*  
  } 7h9U{4r: M  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 |j~lkzPnV  
   for(int index=0;index<MAX_KEY;index++){ c&nh>oN  
    if(hCallWnd[index]==NULL) {XCf-{a]~  
     continue; # Su~`]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) n/4i|-^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); t^tmz PWA  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 m#7*:i&@Y  
   } ec3<%+0f  
  } bBc-^  
 } PoSpkJH  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); EnVuD 9  
} &qM[g 9  
,  X{>  
  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: /j2H A^GT  
??&<k   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  ti@kKz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  C})'\1O%  
Wr?'$:  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: /RnTQ4   
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LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) x.mrCJn)  
{ RP4Ku9hk  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) eD?3"!c!  
 { 2{|$T2?e  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 IH *s8tPc  
  SaveBmp(); x2Lq=zwJ  
  return FALSE; qoMfSz"(  
 } "tk-w{>  
 …… //其它处理及默认处理 =n(3o$r(  
} 0E`1HP"b  
Ah69 _>N`S  
#U mF-c  
  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。 *iA4:EIP  
YX*x&5]lq  
  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。 _ QOZ sEe  
EbNd=Z'J  
  二、编程步骤 E0n6$5Uc?  
2/ rt@{V(  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; i]{1^pKq  
4'1m4Ugg  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; )FN;+"IJ  
q!~ -(&S  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; =@x`?oev  
xGk6n4Gg  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ~ Heb1tl ;  
rh*sbZ68>E  
  5、 添加代码,编译运行程序。 *jq7X  
da!P0x9p  
三、程序代码 HeGY u?&  
PUJ2`iP1^3  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL d~J-|yyT  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9p* gU[  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ &C<yfRDu  
#if _MSC_VER > 1000 {y=W6uP  
#pragma once 0 fXLcal  
#endif // _MSC_VER > 1000 ^ <`(lyph  
#ifndef __AFXWIN_H__ yM.IxpT#$  
#error include 'stdafx.h' before including this file for PCH ZzGahtx)Y  
#endif +avMX&%  
#include "resource.h" // main symbols 75T_Dx(H  
class CHookApp : public CWinApp Z6C=T;w  
{ z+}QZ >  
 public:  D1 Z{W  
  CHookApp(); zdl%iop3e  
  // Overrides Df =dt  
  // ClassWizard generated virtual function overrides W<ZK,kv  
  //{{AFX_VIRTUAL(CHookApp) {~GYj%-^  
 public: Yj|eji7y  
  virtual BOOL InitInstance(); BAj-akc f  
  virtual int ExitInstance(); ( lm&*tKm  
  //}}AFX_VIRTUAL :,12")N  
  //{{AFX_MSG(CHookApp) L WoG4s?w  
  // NOTE - the ClassWizard will add and remove member functions here. %.v{N6  
  // DO NOT EDIT what you see in these blocks of generated code ! @Hb'8F  
  //}}AFX_MSG P;[OWSR[d  
  DECLARE_MESSAGE_MAP() f"u *D,/sS  
}; `^JJ&)4iv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); wFh8?Z3u_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `N//A}9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %_-zWVJ  
BOOL InitHotkey(); KOq;jH{$  
BOOL UnInit(); ]M>9ULQ  
#endif g>0XxjP4  
[S]S^ej*8  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. +6$g! S5{  
#include "stdafx.h" `vG,}Pt]  
#include "hook.h" n6d9 \  
#include <windowsx.h> /^{BUo  
#ifdef _DEBUG hVT~~n`Rj  
#define new DEBUG_NEW jxa D&4Fs8  
#undef THIS_FILE j:T/iH!YF  
static char THIS_FILE[] = __FILE__; 5RH2"*8T  
#endif hRI"y":zD  
#define MAX_KEY 100 N/$`:8"  
#define CTRLBIT 0x04 1 2++RkL#  
#define ALTBIT 0x02 GDhE[of  
#define SHIFTBIT 0x01 }eQRN<}P  
#pragma data_seg("shareddata") `(+o=HsD  
HHOOK hHook =NULL; .o1^Oh  
UINT nHookCount =0; 3nZ9m  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey EFuvp8^y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT >SN|?|2U/  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey TC~Q G$NW  
static int KeyCount =0; Xv <G-N4  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift "vYE+   
#pragma data_seg() Md6]R-l@  
HINSTANCE hins; )3YtIH_  
void VerifyWindow(); #*$P'r  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 5erc D  
//{{AFX_MSG_MAP(CHookApp) /&& 2u7*  
// NOTE - the ClassWizard will add and remove mapping macros here. {qW~"z*  
// DO NOT EDIT what you see in these blocks of generated code! f'Iz G.R  
//}}AFX_MSG_MAP pMg3fUIM  
END_MESSAGE_MAP() l+V,DCE  
n%R;-?*v  
CHookApp::CHookApp() g*)K/Z0pJ$  
{ ;4M><OS!  
 // TODO: add construction code here, C 3hv*  
 // Place all significant initialization in InitInstance Xtz-\v#0o'  
} I KtB;  
J89Dul l  
CHookApp theApp; TSAU?r\P  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Cz4)Yz  
{ n,eJ$2!J  
 BOOL bProcessed=FALSE; '\~$dtI$  
 if(HC_ACTION==nCode) IKMeJ(:S  
 { {e|*01hE  
  if((lParam&0xc0000000)==0xc0000000){// Key up IW8+_#d  
   switch(wParam) v5;I]?72l~  
   { $@d9<83=  
    case VK_MENU: 4Wy <?O2  
     MaskBits&=~ALTBIT; QB:i/9  
     break; mNf8kwr  
    case VK_CONTROL: k4qp u=@U  
     MaskBits&=~CTRLBIT; e__@GBG  
     break; ^JI o? R  
    case VK_SHIFT: }R3=fbe,\  
     MaskBits&=~SHIFTBIT; wxm:7$4C  
     break; 2oa#0`{  
    default: //judge the key and send message ,*4p?|A  
     break; i |{Dd%4vK  
   } /vY_Y3k#  
   for(int index=0;index<MAX_KEY;index++){ 87 }&`  
    if(hCallWnd[index]==NULL) 5qg2Zc~  
     continue; <9=9b_z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t E` cau  
    { ;!o]wHmA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); A^ _a3$,0  
     bProcessed=TRUE; cJM:  
    } *Ype>x{  
   } ] 2DH;  
  } K.G$]H  
  else if((lParam&0xc000ffff)==1){ //Key down 2^t#6XBk/  
   switch(wParam) d=,%= @  
   { WwC 5!kZ  
    case VK_MENU: "#v=IJy&r  
     MaskBits|=ALTBIT; Cv$ SJc  
     break; !R*-R.%  
    case VK_CONTROL: w ;daC(:  
     MaskBits|=CTRLBIT; T081G`li  
     break; \MxoZ  
    case VK_SHIFT: QDpEb=|S  
     MaskBits|=SHIFTBIT; o7B[R) 4  
     break; ^:9$@ +a  
    default: //judge the key and send message zkTp`>9R  
     break; U yw-2]!n  
   } V{|}}b?w?  
   for(int index=0;index<MAX_KEY;index++) /8VP[i)u  
   { Rwr 2gMt7  
    if(hCallWnd[index]==NULL) <Sz52Suh>  
     continue; 5XuT={o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) b{fQ|QD{^E  
    { 0-LpqX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); C^ Q tSha  
     bProcessed=TRUE; ,!V]jP)  
    } b 1&i#I?{  
   } "<}&GcJbz  
  } Z%GTnG|rG  
  if(!bProcessed){ 1!pa;$L  
   for(int index=0;index<MAX_KEY;index++){ 2+Px'U\  
    if(hCallWnd[index]==NULL) <foCb%$(?  
     continue; LqdY Qd51  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Soie^$ Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); iHf-{[[Z  
   } }F+zs*S  
  }  0l;<5  
 } 6t/`:OZC:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); `%3 /   
} 9N%JP+<89  
JQ :Ri  
BOOL InitHotkey() o ]IjK  
{ 4tSv{B/}  
 if(hHook!=NULL){ 2<mW\$  
  nHookCount++; rF\ "w0J_  
  return TRUE; _C\[DR0n  
 } i{D=l7j|w  
 else RE.r4uOJg  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); n.hv!W0  
  if(hHook!=NULL) UpXz&k  
   nHookCount++; 8q`$y$06Dk  
  return (hHook!=NULL);  FgL,k  
} aA-  
BOOL UnInit() U/lM\3v/e  
{ (M =Y&M'f  
 if(nHookCount>1){ L6>pGx  
  nHookCount--; $D31Q[p=+  
  return TRUE; ?PTk1sB  
 } , @m@S ^  
 BOOL unhooked = UnhookWindowsHookEx(hHook); (Qgde6  
 if(unhooked==TRUE){ l{w#H|]  
  nHookCount=0; ,ZblI O Wb  
  hHook=NULL; %+ZJhHT  
 } VF&Z%O3n  
 return unhooked; EBtLzbj  
} 3D9 !M-  
MxzLK%am  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %AOIKK5  
{ iR$<$P5  
 BOOL bAdded=FALSE; b;|55Y  
 for(int index=0;index<MAX_KEY;index++){ -T6(hT\  
  if(hCallWnd[index]==0){ gPC*b+  
   hCallWnd[index]=hWnd; }HEvr)v9  
   HotKey[index]=cKey; ~.%K/=wK@  
   HotKeyMask[index]=cMask; *&AfR8x_z  
   bAdded=TRUE; kP xa7  
   KeyCount++; Y32O-I!9u  
   break; "^I mb,  
  } jkiTj~WE-  
 } :V)lbn\  
 return bAdded; XW JwJ  
} ? muzU.h"z  
C@N1ljXJT  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) OL7_'2_z.  
{ ;M]C1!D9#  
 BOOL bRemoved=FALSE; ;X,1&#I  
 for(int index=0;index<MAX_KEY;index++){ {b]aC  
  if(hCallWnd[index]==hWnd){ 9;yn}\N `  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ .k TG[)F0b  
    hCallWnd[index]=NULL; [<`SfE  
    HotKey[index]=0; -st7_3  
    HotKeyMask[index]=0; yBLK$@9  
    bRemoved=TRUE; B7\k< Nit0  
    KeyCount--; *`( <'Z  
    break; wOB azWa   
   } Cw5%\K$=  
  } bYe;b><G  
 } W~_t~Vg5  
 return bRemoved; ~f|Z%&l|  
} uH3D{4   
s=?aox7  
void VerifyWindow() K!D o8|  
{ <"o"z2  
 for(int i=0;i<MAX_KEY;i++){ X\p,%hk \  
  if(hCallWnd!=NULL){ zb6ju]2  
   if(!IsWindow(hCallWnd)){ W:i?t8y\y  
    hCallWnd=NULL; H1!iP$1#V  
    HotKey=0; =O|c-k,f@  
    HotKeyMask=0; ,_!6U  
    KeyCount--; \qi|Js*{  
   } ,? E&V_5  
  } VC5_v62&.  
 } wwKh CmH  
} uGdp@]z&8Q  
\Mv":Lm1  
BOOL CHookApp::InitInstance()  Lw1T 4n  
{ v+6@ cC  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); PR<||"03  
 hins=AfxGetInstanceHandle(); T5wjU*=IL  
 InitHotkey(); 7dihVvL $  
 return CWinApp::InitInstance(); >k']T/%  
} (Lh#`L?x  
v;{{ y-  
int CHookApp::ExitInstance() 7iu Q9q^&  
{ 9Qj2W  
 VerifyWindow(); v"+k~:t*  
 UnInit(); NV4g~+n  
 return CWinApp::ExitInstance(); Ql?^ B SqG  
} iq?#rb P#I  
FDR1 Gy  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *cWmS\h|  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3*DXE9gA9  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ {>0V[c[~  
#if _MSC_VER > 1000 R)!`JKeO/  
#pragma once <(@Syv)  
#endif // _MSC_VER > 1000 31Cq22"  
Z.Rb~n&  
class CCaptureDlg : public CDialog ^SEdA=!  
{ 8:ggECD  
 // Construction {TXOQ>gY  
 public: SM[{BH<  
  BOOL bTray; 3L-^<'~-k;  
  BOOL bRegistered; >KG E-Yzj  
  BOOL RegisterHotkey(); (7lBID4  
  UCHAR cKey; g1DmV,W-Q  
  UCHAR cMask; [n,?WwC  
  void DeleteIcon(); b|^I<7  
  void AddIcon();  \d.F82  
  UINT nCount; Vu0 KtG9  
  void SaveBmp(); lD;'tqaC  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor (k-YI{D3  
  // Dialog Data "oJ(J{Jat  
  //{{AFX_DATA(CCaptureDlg) 'p)Q68;&  
  enum { IDD = IDD_CAPTURE_DIALOG }; vnX  
  CComboBox m_Key; )"@t6.  
  BOOL m_bControl; toa-Wa{  
  BOOL m_bAlt; -237Lx$/  
  BOOL m_bShift; @%tXFizh  
  CString m_Path; l52a\/  
  CString m_Number; t[.W$1=  
  //}}AFX_DATA B_3QQ tjAl  
  // ClassWizard generated virtual function overrides #?} 6t~  
  //{{AFX_VIRTUAL(CCaptureDlg) 2x$x; \*j  
 public: n1(?|aJ#1  
  virtual BOOL PreTranslateMessage(MSG* pMsg); $]d*0^J 6  
 protected: upn8n vy4(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?`sy%G  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); cErI%v}v0  
  //}}AFX_VIRTUAL Dxx;v.$  
  // Implementation \Z5 +$Ij  
 protected: Qb^q+C)o]  
  HICON m_hIcon; vg%QXaM  
  // Generated message map functions wV <7pi  
  //{{AFX_MSG(CCaptureDlg) y<r}"TAf-  
  virtual BOOL OnInitDialog(); +Al>2~  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); _45cH{$sA  
  afx_msg void OnPaint(); u'9gVU B  
  afx_msg HCURSOR OnQueryDragIcon(); sn\;bq  
  virtual void OnCancel(); Q/_#k/R  
  afx_msg void OnAbout(); f|0lj   
  afx_msg void OnBrowse(); Unl?fXI  
  afx_msg void OnChange(); 1/j$I~B   
 //}}AFX_MSG ;'kI/(;;C  
 DECLARE_MESSAGE_MAP() 9$WJ"]  
}; i1*C{Lf;%)  
#endif P9#)~Zm}]  
vd~U@-C=R  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file a#(U2OP  
#include "stdafx.h" w[fDk1H)  
#include "Capture.h" W04av_u 5  
#include "CaptureDlg.h" B#N7qoi  
#include <windowsx.h> 'qeP6}M  
#pragma comment(lib,"hook.lib") 3l:XhLOj  
#ifdef _DEBUG =:$) Z  
#define new DEBUG_NEW Cyk s  
#undef THIS_FILE o\4t4}z~'f  
static char THIS_FILE[] = __FILE__; 9 pKm*n&  
#endif 2bQ/0?.).-  
#define IDM_SHELL WM_USER+1 [STje8+V  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /5a;_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^" 6f\  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; qb7^VIo%c  
class CAboutDlg : public CDialog $+VgDe5{S  
{ XoL[ r67Z  
 public: p]f&mBO*  
  CAboutDlg(); 2;(W-]V?  
  // Dialog Data !'c| N9  
  //{{AFX_DATA(CAboutDlg) Zw=G@4xoU  
  enum { IDD = IDD_ABOUTBOX }; mUwUs~PjA  
  //}}AFX_DATA XL"=vbD  
  // ClassWizard generated virtual function overrides CyTFb$Z  
  //{{AFX_VIRTUAL(CAboutDlg) gA +:CgQ  
 protected: #tz8{o?ebN  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (KF7zP  
  //}}AFX_VIRTUAL <c%n?QK{  
  // Implementation g5}7y\  
 protected: >}]H;& l  
  //{{AFX_MSG(CAboutDlg) *FPg#a+  
  //}}AFX_MSG [\HQPo'S  
  DECLARE_MESSAGE_MAP() <q6`~F~|  
}; u~Lu<3v  
./iXyta  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) D0%FELG05  
{ *,jqE9:O  
 //{{AFX_DATA_INIT(CAboutDlg) 75Fp[Q-  
 //}}AFX_DATA_INIT ]7<m1Lg  
} i7v/A&Rc  
:uR>UDlPX  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >\\5"S f  
{ g\J)= ,ju,  
 CDialog::DoDataExchange(pDX);  Ec.)!Hu  
 //{{AFX_DATA_MAP(CAboutDlg) pGk"3.ce  
 //}}AFX_DATA_MAP 59MR|Jt  
} \9jpCNdJ  
!u0U5>ccw  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) fk\5D[j^  
 //{{AFX_MSG_MAP(CAboutDlg) S~&\o\"5  
 // No message handlers d<Dn9,G  
 //}}AFX_MSG_MAP "gg(tp45  
END_MESSAGE_MAP() o[{&!t  
MgP{W=h2  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) TAAR'Jz S  
: CDialog(CCaptureDlg::IDD, pParent) cUM_ncYOP  
{ [;F{mN  
 //{{AFX_DATA_INIT(CCaptureDlg) Zjt9vS)  
  m_bControl = FALSE; 3:O+GQ*  
  m_bAlt = FALSE; +9~ZA3DiP  
  m_bShift = FALSE; `vH&K{   
  m_Path = _T("c:\\"); !G>(j   
  m_Number = _T("0 picture captured."); }wG|%Y#+r  
  nCount=0; wLSjXpP8  
  bRegistered=FALSE; ,*w>z  
  bTray=FALSE; _DrnL}9I7  
 //}}AFX_DATA_INIT Ctj8tK$D  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 <[FS%2,0mb  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); +DxifXtB  
} "?+UI   
p}r yKW\cJ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 7(5]Ry:  
{ X@eg<]'m  
 CDialog::DoDataExchange(pDX); ]nHe$x!2]  
 //{{AFX_DATA_MAP(CCaptureDlg) 5 2fO)!  
  DDX_Control(pDX, IDC_KEY, m_Key); {V=vn L--  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ZnQ27FcW  
  DDX_Check(pDX, IDC_ALT, m_bAlt); & ]%\.m  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); HMQ 'b(a'  
  DDX_Text(pDX, IDC_PATH, m_Path); &BTfDsxAK  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Tu'E{Hw  
 //}}AFX_DATA_MAP X`tOO  
} >]C<j4  
6|i`@|#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) i!y\WaCp  
//{{AFX_MSG_MAP(CCaptureDlg) TA<hj[-8  
 ON_WM_SYSCOMMAND() n<+~ zQ  
 ON_WM_PAINT() l#|J rU!  
 ON_WM_QUERYDRAGICON() FqL`Kt  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) h#;?9DP  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) AV9:O{  
 ON_BN_CLICKED(ID_CHANGE, OnChange) {\F2*P  
//}}AFX_MSG_MAP 0rGj|@+;  
END_MESSAGE_MAP() "&| lO|  
9PWm@ Nlf  
BOOL CCaptureDlg::OnInitDialog() vN' VDvVM  
{ W3aXW,P.V  
 CDialog::OnInitDialog(); @t "~   
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ?F!W#   
 ASSERT(IDM_ABOUTBOX < 0xF000); 1.uUMW  
 CMenu* pSysMenu = GetSystemMenu(FALSE); J~fuW?a]r  
 if (pSysMenu != NULL) (PyTq 5:F  
 { +6wx58.B&  
  CString strAboutMenu; o<~-k,{5P  
  strAboutMenu.LoadString(IDS_ABOUTBOX); fWqv3nY^  
  if (!strAboutMenu.IsEmpty()) $;Q=iv 3  
  { $)4GCP  
   pSysMenu->AppendMenu(MF_SEPARATOR); tc!!W9{69  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); t4C<#nfo  
  } k`{RXx  
 } *c!;^Qyp&  
 SetIcon(m_hIcon, TRUE); // Set big icon #I bS  
 SetIcon(m_hIcon, FALSE); // Set small icon ttTI#Fr2  
 m_Key.SetCurSel(0); Bi$ 0{V Z8  
 RegisterHotkey(); ^7J~W'hI  
 CMenu* pMenu=GetSystemMenu(FALSE); !4i,%Z& 6  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); SxnIX/]J  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); EaJDz`T}  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); dw'<"+zO  
 return TRUE; // return TRUE unless you set the focus to a control d%S=$}o  
} Ks9FnDm8  
)R8%wk?2  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ab8oMi`z  
{ EKV+?jj$  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) " &_$V@S  
 { 1kbT@  
  CAboutDlg dlgAbout; +R3\cRM  
  dlgAbout.DoModal(); ^uKnP>*l  
 } yBJ/>SAcG  
 else LuQ"E4;nY%  
 { )er?*^9Z  
  CDialog::OnSysCommand(nID, lParam); VyB\]EBu  
 } cfrvy^>,  
} byEvc[/>Ys  
OHx,*}N  
void CCaptureDlg::OnPaint() >DPds~k  
{  PU,6h}  
 if (IsIconic()) +,ZU TG  
 { !C9ps]6  
  CPaintDC dc(this); // device context for painting Ec7{BhH)  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @&!=m]D*  
  // Center icon in client rectangle UrD=|-r`  
  int cxIcon = GetSystemMetrics(SM_CXICON); vLi/'|7  
  int cyIcon = GetSystemMetrics(SM_CYICON); i*mZi4URN  
  CRect rect; xl1L4R)6D  
  GetClientRect(&rect); g&oc=f`  
  int x = (rect.Width() - cxIcon + 1) / 2; ;:#?~%7>  
  int y = (rect.Height() - cyIcon + 1) / 2; HPu/. oE  
  // Draw the icon +1E?He:iQ  
  dc.DrawIcon(x, y, m_hIcon); 12%z3/i  
 } f}Ne8]U/Hc  
 else c4!c_a2pS  
 { _QC?:mv6-  
  CDialog::OnPaint(); }1X11+/W  
 } "ZA$"^  
} XvfcPI6  
y^E F<<\  
HCURSOR CCaptureDlg::OnQueryDragIcon() bQ|#_/?  
{ kxr6sO~  
 return (HCURSOR) m_hIcon; A{DIp+  
} | o;j0  
t1.zWe+C>3  
void CCaptureDlg::OnCancel() ;PP_3`  
{ IS5.i95m  
 if(bTray) JxMyeo%gv  
  DeleteIcon(); 60U{ e}Mkb  
  CDialog::OnCancel(); k"3Z@Px:  
} }"g21-T^  
:Ul'(@  
void CCaptureDlg::OnAbout() <Y}"D Yt  
{ Z=e[ !c  
 CAboutDlg dlg; O]$*EiO\  
 dlg.DoModal(); V8KTNt%  
} @&i#S}%/  
R"9oMaY  
void CCaptureDlg::OnBrowse() 2m)kyQ  
{ 6\)8mK  
 CString str; 6,V.j>z  
 BROWSEINFO bi; ?:{0  
 char name[MAX_PATH]; ~_f |".T  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); G>_42Rp  
 bi.hwndOwner=GetSafeHwnd(); .Y^d9.  
 bi.pszDisplayName=name; Z,N7nMJf  
 bi.lpszTitle="Select folder"; hX'z]Am<  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ~q'w),bE"Q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); v ,G-k2$Qe  
 if(idl==NULL) Yq)YS]  
  return; #LrCx"_&  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); u$Pf.#  
 str.ReleaseBuffer(); m"?' hR2  
 m_Path=str; /`j  K  
 if(str.GetAt(str.GetLength()-1)!='\\') Mi %1+  
  m_Path+="\\"; k?|F0e_  
 UpdateData(FALSE); DS[l,x  
} Us@ {w`T  
Gg3?2h"d  
void CCaptureDlg::SaveBmp() lo>-}xd  
{ kERaY9L\  
 CDC dc; 69<rsp(p  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); a?U%l9F  
 CBitmap bm; !Wdt:MUI8  
 int Width=GetSystemMetrics(SM_CXSCREEN); @tjZvRtZ  
 int Height=GetSystemMetrics(SM_CYSCREEN); tx|"v|&e2  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 2'O!~8U  
 CDC tdc; sGDrMAQt  
 tdc.CreateCompatibleDC(&dc); hNR >Hy\  
 CBitmap*pOld=tdc.SelectObject(&bm); 1=o(sIeA  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY);  2U+z~  
 tdc.SelectObject(pOld); qu#@F\gX  
 BITMAP btm; 0=(-8vwd  
 bm.GetBitmap(&btm); x`=5l`  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; u%gm+NneK  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); +hKPOFa'  
 BITMAPINFOHEADER bih; p Yi=q  
 bih.biBitCount=btm.bmBitsPixel; #(7RX}  
 bih.biClrImportant=0; [r~rIb%Zj  
 bih.biClrUsed=0; r/s&ee  
 bih.biCompression=0; ''\cBM!  
 bih.biHeight=btm.bmHeight; d)17r\*>I  
 bih.biPlanes=1; /O(;~1B  
 bih.biSize=sizeof(BITMAPINFOHEADER); :;hBq4h  
 bih.biSizeImage=size; b$`4Nn|  
 bih.biWidth=btm.bmWidth; GD6'R"tJ  
 bih.biXPelsPerMeter=0; ^&G O4u  
 bih.biYPelsPerMeter=0; $Zu4tuXA  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ezq q@t9  
 static int filecount=0; -~Z@,  
 CString name; IpaJ<~ p  
 name.Format("pict%04d.bmp",filecount++); 0or6_ y6  
 name=m_Path+name; ]K0,nj*\c  
 BITMAPFILEHEADER bfh; ,n,7.m.D  
 bfh.bfReserved1=bfh.bfReserved2=0; (EF$^FYPK  
 bfh.bfType=((WORD)('M'<< 8)|'B'); K~hlwjrt  
 bfh.bfSize=54+size; Q&U= jX  
 bfh.bfOffBits=54; as!|8JE`  
 CFile bf; ow>[#.ua  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;KjMZ(Iil1  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); !f]3Riw-=,  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Vo9)KxR  
  bf.WriteHuge(lpData,size); 5-QvQ&eH.  
  bf.Close(); Rp@}9qijb  
  nCount++; ?'$. -z:  
 } BKP!+V/  
 GlobalFreePtr(lpData); /*R' xBr  
 if(nCount==1) bM3'm$34  
  m_Number.Format("%d picture captured.",nCount); A&_i]o  
 else ?k7/`g U  
  m_Number.Format("%d pictures captured.",nCount); HjF'~n  
  UpdateData(FALSE); }"; hz*a  
} DrCfC[A~]  
B8#f^}8  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) C` 1\$U~%  
{ J`D<  
 if(pMsg -> message == WM_KEYDOWN) VT~ ^:-]  
 { [r< Y0|l,m  
  if(pMsg -> wParam == VK_ESCAPE) pcxl2I  
   return TRUE; <wGT s6  
  if(pMsg -> wParam == VK_RETURN) $MVeMgPa  
   return TRUE; ,vY I O  
 } TX5/{cHd  
 return CDialog::PreTranslateMessage(pMsg); wCEfR!i  
} kU9AfAe  
[.#$hOsNR  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~(doy@0M  
{ &)'kX  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ c$Nl-?W  
  SaveBmp(); nOoh2jUM  
  return FALSE; -){^ Q:u  
} H-y-7PW*~  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ /)<7$  
 CMenu pop; [~r $US  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [(^''*7r+T  
 CMenu*pMenu=pop.GetSubMenu(0); lV*&^Q8.  
 pMenu->SetDefaultItem(ID_EXITICON); sAAIyPJts  
 CPoint pt; b:d.Lf{y7  
 GetCursorPos(&pt); BO cEL%+  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); D `3yv R  
 if(id==ID_EXITICON) K0!#l Br  
  DeleteIcon(); NZ? =pfK\s  
 else if(id==ID_EXIT) L$07u{Q  
  OnCancel(); Fl(ZKpSZU  
 return FALSE; ea;c\84_N  
} a{YVz\?d}  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -8J@r2\  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) "%iR-s_>  
 AddIcon(); M]:B: ;  
 return res; rlh6\Fa  
} YO4ppL~xe  
sN/Xofh  
void CCaptureDlg::AddIcon() vP;tgW9Qk  
{ leqSS}KU+  
 NOTIFYICONDATA data; Iz=E8R g  
 data.cbSize=sizeof(NOTIFYICONDATA); :r+ 1>F$o  
 CString tip; Yy;1N{dbT  
 tip.LoadString(IDS_ICONTIP); WQ`P^5e  
 data.hIcon=GetIcon(0); n7<-lQRaxZ  
 data.hWnd=GetSafeHwnd(); e/I{N0SR  
 strcpy(data.szTip,tip); %[F;TZt  
 data.uCallbackMessage=IDM_SHELL; X~VZ61vNu  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; BP><G^  
 data.uID=98; IZ ha* 7  
 Shell_NotifyIcon(NIM_ADD,&data); e/~<\  
 ShowWindow(SW_HIDE); pNme jz:  
 bTray=TRUE; k5<0M'  
} Z19y5?uR  
lt2& uYgp  
void CCaptureDlg::DeleteIcon() xo3)ds X  
{ UE](`|4H  
 NOTIFYICONDATA data; #3jZ7RqzQ  
 data.cbSize=sizeof(NOTIFYICONDATA); C 5!6k1TcE  
 data.hWnd=GetSafeHwnd(); ApB'O;5  
 data.uID=98; Z.f<6<gF  
 Shell_NotifyIcon(NIM_DELETE,&data); )u:8Pv  
 ShowWindow(SW_SHOW); (.t:sn"P  
 SetForegroundWindow(); \shoLp   
 ShowWindow(SW_SHOWNORMAL); Eu_0n6J  
 bTray=FALSE; c=mFYsSv  
} -2XIF}.Hu  
bJ[1'Es `  
void CCaptureDlg::OnChange() #.K&]OV/88  
{ Gs?sO?j  
 RegisterHotkey(); dNmX<WXG  
} M#IR=|P]  
gU$3Y#R  
BOOL CCaptureDlg::RegisterHotkey()  +PD5pr  
{ 35\0g&  
 UpdateData(); RLr-xg$K-t  
 UCHAR mask=0; (bXp1*0 ;  
 UCHAR key=0; g9`ytWmM  
 if(m_bControl) Tdp$laPO'  
  mask|=4; KWkT 9[H  
 if(m_bAlt) uATRZMai  
  mask|=2; FiH!) 6T  
 if(m_bShift) [IW7]Fv<F  
  mask|=1; 7~g0{W>Zm  
  key=Key_Table[m_Key.GetCurSel()]; g7ROA8xu  
 if(bRegistered){ TMs\#  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); lKSI5d  
  bRegistered=FALSE; cE#Y,-f  
 } }jXUd=.Nu  
 cMask=mask; $t?e=#G  
 cKey=key; #@`^  .  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); `fHiY.-  
 return bRegistered; N{@ eV][Q  
} g9Ll>d)tE3  
AY]nc# zz  
  四、小结 0<;B2ce  
kE|#mI[>  
  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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