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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: Nt9M$?\P  
  e)LRD&Q  
  一、实现方法 }$s#H{T!  
;ajCnSmR  
  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: :t-a;Q;  
|gM|>  
#pragma data_seg("shareddata") $]K gs6=r  
HHOOK hHook =NULL; //钩子句柄 Ol6jx%Je`  
UINT nHookCount =0; //挂接的程序数目 &duWV6Acw  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 XYhN;U}Z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 at]=SA  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey W'u6F-$2  
static int KeyCount =0; P% _cIR  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 AHc:6v^  
#pragma data_seg() :oY u+ cQ  
i-w^pv'  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 aa2&yc29hp  
W\:!v%C  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: #g*U\y  
2W:R{dHE  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 3 HOJCgit  
cKey,UCHAR cMask) z^$DXl@)h  
{ Yb\t0:_  
 BOOL bAdded=FALSE; wl1i @&9  
 for(int index=0;index<MAX_KEY;index++){ KWbnSL8  
  if(hCallWnd[index]==0){ ?pn<lW8d  
   hCallWnd[index]=hWnd; D*BZp0x  
   HotKey[index]=cKey; u9My.u@-*%  
   HotKeyMask[index]=cMask; A(G%9'T  
   bAdded=TRUE; hJ$o+sl  
   KeyCount++; !|;^  
   break; M3ihtY  
  } gR}> q4b  
 } $#4Qv5}  
 return bAdded; JpqZVu"7  
} 8\HL8^6c5  
//删除热键 :so2 {.t-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4$.$j=Ct."  
{ GTL gj'B  
 BOOL bRemoved=FALSE; 4^cDp!8  
 for(int index=0;index<MAX_KEY;index++){ gcDo o2RE  
  if(hCallWnd[index]==hWnd){ (T:OZmEO.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ XG FjqZr`  
    hCallWnd[index]=NULL; oU`8\ n](  
    HotKey[index]=0; <"F\&M`G  
    HotKeyMask[index]=0; ?3 {&"  
    bRemoved=TRUE; DKw%z8ft|  
    KeyCount--; C4wJSQl_I  
    break; IZ+kw.6e  
   } V}gP'f07zy  
  } CZ* #FY  
 } Agt6G\ n  
 return bRemoved; n+ 1!/H=d  
} HYm |  
$BHbnsaQ  
5p!X}u ]  
  DLL中的钩子函数如下: ^'>kZ^w0  
^f*}]`S  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 1{D_30sG.  
{ kHLpa/A  
 BOOL bProcessed=FALSE; nF$n[:  
 if(HC_ACTION==nCode) #yz5CWu  
 { "c5C0 pK0  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 i4;`dCT|A  
   switch(wParam) OiBDI3,|+  
   {  RO.GD$ 3n  
    case VK_MENU: z\64Qpfm  
     MaskBits&=~ALTBIT; r*?rwtFtg  
     break; Mx? ]7tI  
    case VK_CONTROL: y.,S}7l:  
     MaskBits&=~CTRLBIT; GVS-_KP\  
     break; ZccQ{$0H  
    case VK_SHIFT: Z9P rw/8P  
     MaskBits&=~SHIFTBIT; s+#|j;V<  
     break; .G-F5`2I  
    default: //judge the key and send message :lf;C T6$  
     break; OSP#FjH  
   } &%J+d"n(  
   for(int index=0;index<MAX_KEY;index++){ +LBDn"5  
    if(hCallWnd[index]==NULL) '2)c;/-E  
     continue; 1K(a=o[Ce  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *;^!FBT  
    { .gY}}Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6x18g(KbP  
     bProcessed=TRUE; Ce&nMgd~  
    } o=/Cje  
   } R}~p1=D  
  } cfZG3 "  
  else if((lParam&0xc000ffff)==1){ //有键按下 KKMzhvf]#  
   switch(wParam) epz'GN]V  
   { yWS #{| o(  
    case VK_MENU: p1}Y|m!  
     MaskBits|=ALTBIT; 'p0|wM_  
     break;  3Ee8_(E\  
    case VK_CONTROL: 6AS'MD%&  
     MaskBits|=CTRLBIT; oh%kuO T[  
     break; si`{>e~`6P  
    case VK_SHIFT: gkxEy5c[  
     MaskBits|=SHIFTBIT; s=)0y$  
     break; 31BN ?q  
    default: //judge the key and send message agQ5%t#  
     break; 1-z*'Ghys  
   } L|sWSrqd  
   for(int index=0;index<MAX_KEY;index++){ Ub1?dk   
    if(hCallWnd[index]==NULL) Y-8qAF?SJ]  
     continue; / D9FjOP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Rg:3}T`~n  
    { }h+_kRQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); TWv${m zE  
     bProcessed=TRUE; g4n& k  
    } F[aow$",+}  
   } i&cH  
  } w1zI"G~4/Q  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 iU)-YFO  
   for(int index=0;index<MAX_KEY;index++){ IKJ~sw~AQ  
    if(hCallWnd[index]==NULL) O5"o/Y~m  
     continue; c[=%v]j:u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .aRL'1xHl  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); U3ygFW%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 3J\NkaSR  
   } ^RN1?dXA  
  } 0 O{Y Vk`  
 } 4SG22$7W  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); " mKMym2  
} x,9fOA  
eYL7G-3  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: X^3 0a*sj  
YK# QH"}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Kuh! b`9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); vFfvvRda4x  
Z&mV1dxR  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: NJYx.TL  
uO$ujbWZ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gbc^Lb  
{ ^q"wd?((h  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) qA- ya6  
 { M/U$x /3K  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 &}Y_EHj}  
  SaveBmp(); %iPu51+=  
  return FALSE; B3I\=  
 } ?Y"bt^4j  
 …… //其它处理及默认处理 d}f| HOFq  
} ~A8%[.({5  
?KxI|os  
5H6GZ:hp  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 l3aG#4jj  
,5\:\e0H  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 inBd.%Yr  
H*QN/{|RU  
  二、编程步骤 ~qNpPIrGr  
(l 2 2p  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; YQR*?/?a  
RJs_ S  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; (4V1%0  
{d$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; d9/E^)TT  
1A23G$D  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; VmQ7M4j*  
#SY8Zv  
  5、 添加代码,编译运行程序。 X7kJWX  
;>=hQC{f>  
三、程序代码 |Sg *j-.  
TGLkwXOkT  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL oWyg/{M  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) y? [*qnPj  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ tC+9W1o  
#if _MSC_VER > 1000 C!w@Naj  
#pragma once T4 SByX9  
#endif // _MSC_VER > 1000 "xdJ9Z-B  
#ifndef __AFXWIN_H__ xsRMF&8L  
#error include 'stdafx.h' before including this file for PCH /3%]Ggwe  
#endif /2u;w !oi.  
#include "resource.h" // main symbols v\Y;)/!  
class CHookApp : public CWinApp '$)Wp_  
{ |xzqYu?o  
 public: +!POKr  
  CHookApp(); 6,G^iv6H  
  // Overrides 5q]u:  
  // ClassWizard generated virtual function overrides {s8''+Q#(-  
  //{{AFX_VIRTUAL(CHookApp) 'D(Hqdr;:  
 public: n#3y2,Ml  
  virtual BOOL InitInstance(); pmCBe6n \l  
  virtual int ExitInstance(); i/xPO  
  //}}AFX_VIRTUAL c7\bA7.  
  //{{AFX_MSG(CHookApp) z>j%-3_1  
  // NOTE - the ClassWizard will add and remove member functions here. Y tGH>0}h  
  // DO NOT EDIT what you see in these blocks of generated code ! G%YD2<V  
  //}}AFX_MSG "EpE!jh  
  DECLARE_MESSAGE_MAP() 17D167\X  
}; }sy3M rb  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); LWbWj ^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); MC#bo{Bq3-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  1 ,PFz  
BOOL InitHotkey(); f Jv 0 B*  
BOOL UnInit(); %8o(x 0  
#endif QBto$!})  
3|:uIoR{  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ](_(1  
#include "stdafx.h" ,h/0:?R KW  
#include "hook.h" cb%w,yXw  
#include <windowsx.h> q){]fp.,@  
#ifdef _DEBUG !^axO  
#define new DEBUG_NEW l^`!:BOtR  
#undef THIS_FILE k9 *0xukJ  
static char THIS_FILE[] = __FILE__; |r-<t  
#endif =X&h5;x'  
#define MAX_KEY 100 V2/+SvB2  
#define CTRLBIT 0x04 6lT'%ho}B  
#define ALTBIT 0x02 FA{I S0  
#define SHIFTBIT 0x01 uy\YJ.WMQ  
#pragma data_seg("shareddata") [9?= &O#*  
HHOOK hHook =NULL; {OAy@6 +  
UINT nHookCount =0; f| N(~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey mA^>Y_:  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT y6*i/3  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey =r0!-[XCa  
static int KeyCount =0; 5!nZvv  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @oRYQ|.R  
#pragma data_seg() ,A6*EJ\w   
HINSTANCE hins; z5'VsK:  
void VerifyWindow(); '&<-,1^L  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) He!0&B\7h  
//{{AFX_MSG_MAP(CHookApp) Xkv>@7ec  
// NOTE - the ClassWizard will add and remove mapping macros here. #gN{8Yk>  
// DO NOT EDIT what you see in these blocks of generated code! ]Vwky]d  
//}}AFX_MSG_MAP Zt!l3(*tt  
END_MESSAGE_MAP() dN*<dz+4r  
+}+hTY$a  
CHookApp::CHookApp() #-lk=>  
{ [/#n+sz.A  
 // TODO: add construction code here, %7|qnh6  
 // Place all significant initialization in InitInstance 3b&W=1J  
} }= <!j5:  
RTl7vzG  
CHookApp theApp; NZlJ_[\$C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3F.O0Vz  
{ Gj)Qw 6  
 BOOL bProcessed=FALSE; d'3'{C|kk  
 if(HC_ACTION==nCode) U'lmQrF!  
 { RmNF]"3%  
  if((lParam&0xc0000000)==0xc0000000){// Key up A`N;vq,  
   switch(wParam) ;,4J:zvZdQ  
   { gdG: &{|x  
    case VK_MENU: ))KsQJ"V  
     MaskBits&=~ALTBIT; Z#J{tXZc  
     break; ' xi..  
    case VK_CONTROL: '6WDs]\  
     MaskBits&=~CTRLBIT; rLKDeB  
     break; WG}QLcP  
    case VK_SHIFT: @pS[_!EqYz  
     MaskBits&=~SHIFTBIT; s+CXKb +  
     break; 8c/Ii"1  
    default: //judge the key and send message nVM`&azD  
     break; }E1Eq  
   } 50R+D0^mh  
   for(int index=0;index<MAX_KEY;index++){ W@S9}+wl*  
    if(hCallWnd[index]==NULL) |y=gp  
     continue; $\K(EBi#G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ol-'2l  
    { h">X!I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); h=U 4  
     bProcessed=TRUE; +_}2zc4  
    } 87>Qw,r  
   } Bpp9I;)c  
  } QV 'y6m\  
  else if((lParam&0xc000ffff)==1){ //Key down 2mT+@G  
   switch(wParam) ~w*ojI  
   { ``z="oD  
    case VK_MENU: y(z U:.  
     MaskBits|=ALTBIT; $?GO|.59  
     break; 7> ]C2!  
    case VK_CONTROL: ~ dk1fh  
     MaskBits|=CTRLBIT; Ce)Wvuh  
     break; , XR8qi~  
    case VK_SHIFT: P4AdfHk  
     MaskBits|=SHIFTBIT; W2B=%`sC  
     break; V9bLm,DtT  
    default: //judge the key and send message r 1a{Y8?  
     break; j,-7J*A~  
   } (1HN, iJy  
   for(int index=0;index<MAX_KEY;index++) $.cGRz  
   { |S}*M<0  
    if(hCallWnd[index]==NULL) gjWH }(K  
     continue; a[!d)Y:zx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;7A,'y4f  
    {  "O 'I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;C<A }  
     bProcessed=TRUE; n)H0;25L  
    } )K6{_~Kc\  
   } '[E_7$d  
  } xr2:bu  
  if(!bProcessed){ M*H G4(n0  
   for(int index=0;index<MAX_KEY;index++){ !Ch ya  
    if(hCallWnd[index]==NULL) e_;6UZ+  
     continue; igL^k`&5^"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /Rz,2jfRx'  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6};oLnO  
   } ou-;k }  
  } l{AT)1;^  
 } q'r3a+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); K\ ]r  
} K7Vr$,p  
D-!%L<<  
BOOL InitHotkey() zK92:+^C   
{ BkeP?X  
 if(hHook!=NULL){ F"C Yrt  
  nHookCount++; el%Qxak`"  
  return TRUE; f5-={lUlIS  
 } FHC7\#p/9Z  
 else E=QQZ\w  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); (Vv]:Y]  
  if(hHook!=NULL) Ei<:=6EX?8  
   nHookCount++; *S4P'JSY  
  return (hHook!=NULL); &$Lm95  
} iT"Itz-^#  
BOOL UnInit() *)1z-rH`  
{ iE`aGoA  
 if(nHookCount>1){ !/zj7z !  
  nHookCount--;  B" z5j  
  return TRUE; hH/ O2  
 } g1|c?#fwo  
 BOOL unhooked = UnhookWindowsHookEx(hHook); UXJl;M b  
 if(unhooked==TRUE){ ~-%A@Lt  
  nHookCount=0; QAwj]_  
  hHook=NULL; k N+(  
 } : eFc.>KoD  
 return unhooked; 3\G=J  
} %R>S"  
A{%;Hd`0/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >cb gL%  
{ WXU6 J?tIm  
 BOOL bAdded=FALSE; t@n (a  
 for(int index=0;index<MAX_KEY;index++){ U'G`Q0n  
  if(hCallWnd[index]==0){ pH [lj8S  
   hCallWnd[index]=hWnd; HWBom8u0  
   HotKey[index]=cKey; W!X]t)Ow  
   HotKeyMask[index]=cMask; c,wU?8Nc|$  
   bAdded=TRUE; /f<(K-o]  
   KeyCount++; i#=X#_ +El  
   break; @k,(i=**  
  } 7p$*/5fk  
 } #O+]ydvT  
 return bAdded; B_2>Yt"  
} Z B&Uhi  
Rp*t"HSaAW  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^nF$<#a  
{ jYz3(mM'J  
 BOOL bRemoved=FALSE; )}!'VIe^!  
 for(int index=0;index<MAX_KEY;index++){ T7~v40jn|  
  if(hCallWnd[index]==hWnd){ uek3Y[n  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ G |^X:+  
    hCallWnd[index]=NULL; |GQ$UB  
    HotKey[index]=0; ~7a BeD  
    HotKeyMask[index]=0; uLljM{ I  
    bRemoved=TRUE; OvG0UXRU  
    KeyCount--; *,*qv^  
    break; iGk{8Da<  
   } {B.]w9  
  } y3]"H(  
 } A#: c  
 return bRemoved; :<8V2  
} vKC&Qi ;  
Z-a(3&  
void VerifyWindow() vq7%SEkES  
{ 7F:;3c  
 for(int i=0;i<MAX_KEY;i++){ -%l, Zd9  
  if(hCallWnd!=NULL){ Y j\yO(o/  
   if(!IsWindow(hCallWnd)){ |l(lrJ{  
    hCallWnd=NULL; U(4_X[qD  
    HotKey=0; KBe {  
    HotKeyMask=0; ! hr@{CD  
    KeyCount--; _|:bac8pL  
   } F@bCm+z-  
  } K<JP9t6Qd  
 } |qDfFGYf  
} QvN <uxm  
L0  2~FT  
BOOL CHookApp::InitInstance() 7=A9E]:  
{ {Y%=/ba W  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); F|`B2Gr  
 hins=AfxGetInstanceHandle(); [#'_@zZz  
 InitHotkey(); Qmx~_  
 return CWinApp::InitInstance(); ^3o8F  
} i bs "Iv34  
F)kLlsp  
int CHookApp::ExitInstance() <9tG_  
{ Q]UYG(  
 VerifyWindow(); (kyo?3  
 UnInit(); `Kw8rG\]:  
 return CWinApp::ExitInstance(); g*r;( H>e  
} B^~Bv!tHWr  
hg'!  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 'OW"*b  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3|r!*+.  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ p Y>-N  
#if _MSC_VER > 1000 G0Tc}_o<Y  
#pragma once @M^Qh Hs  
#endif // _MSC_VER > 1000 PVc|y.  
To%*)a  
class CCaptureDlg : public CDialog 'N ::MN  
{ T)tHN#6I  
 // Construction pbxcsA\  
 public: Lj-&TO}OZ  
  BOOL bTray; aq/Y}s?  
  BOOL bRegistered; DB'KIw  
  BOOL RegisterHotkey(); :wmf{c  
  UCHAR cKey; 6ilC#yyp  
  UCHAR cMask; Le:mMd= G  
  void DeleteIcon(); 7h&`BS  
  void AddIcon(); =1OAy`8  
  UINT nCount; `4$Qv'X*  
  void SaveBmp(); ":^ NLBm>5  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor )u/ ^aK53^  
  // Dialog Data -JhjTA  
  //{{AFX_DATA(CCaptureDlg) =&:f+!1$  
  enum { IDD = IDD_CAPTURE_DIALOG }; 7 +hF;  
  CComboBox m_Key; ~w9 =Fd6  
  BOOL m_bControl; MGKeD+=5  
  BOOL m_bAlt; 2$W,R/CLh  
  BOOL m_bShift; 8Pr7aT:,  
  CString m_Path; #L= eK8^e  
  CString m_Number; o/9LK  
  //}}AFX_DATA  53*, f  
  // ClassWizard generated virtual function overrides 7RC096 ?}  
  //{{AFX_VIRTUAL(CCaptureDlg) v[DbhIXU  
 public: xXxh3 k\  
  virtual BOOL PreTranslateMessage(MSG* pMsg); g74z]Uj.B  
 protected: }%FuL5Tx  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +y4AUU:Q  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ^pV>b(?qw  
  //}}AFX_VIRTUAL bKMR7&e.Ep  
  // Implementation ~TFYlV  
 protected: _u|FJTk  
  HICON m_hIcon; c ^bk:=uj  
  // Generated message map functions H?(SSL  
  //{{AFX_MSG(CCaptureDlg) KP d C9H  
  virtual BOOL OnInitDialog(); "zIq)PY  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); D62 NU  
  afx_msg void OnPaint(); <6O _t,K]  
  afx_msg HCURSOR OnQueryDragIcon(); C"^hMsU8  
  virtual void OnCancel(); X8SRQO^  
  afx_msg void OnAbout(); SP?U@w%}  
  afx_msg void OnBrowse(); e=jT]i*cU  
  afx_msg void OnChange(); eQax ZMU  
 //}}AFX_MSG LSu^#B  
 DECLARE_MESSAGE_MAP() >"<k8wn  
}; 46P6Bwobh  
#endif 69j~?w)^  
1mVVPt^6  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file XZdr`$zf  
#include "stdafx.h" u6Qf*_-K  
#include "Capture.h" ?7nr\g"g(  
#include "CaptureDlg.h" .i&ZT}v3  
#include <windowsx.h> LUDJPIk  
#pragma comment(lib,"hook.lib") |~b R.IA  
#ifdef _DEBUG DMcxa.Sd!  
#define new DEBUG_NEW [kuVQ$)  
#undef THIS_FILE X})Imk7&E  
static char THIS_FILE[] = __FILE__; .F$|j1y  
#endif 87pXv6'FQ  
#define IDM_SHELL WM_USER+1 cI%"Ynq"3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zIm_7\e  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7}cDGdr  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; D@\;@( |  
class CAboutDlg : public CDialog H9san5{  
{ |!?WQ[  
 public: s\C8t0C  
  CAboutDlg(); it\DZGsg  
  // Dialog Data #;"D)C  
  //{{AFX_DATA(CAboutDlg) :IR9=nhS]  
  enum { IDD = IDD_ABOUTBOX }; $S=~YzO  
  //}}AFX_DATA Ph#F<e(9  
  // ClassWizard generated virtual function overrides p;u 1{  
  //{{AFX_VIRTUAL(CAboutDlg) ./&zO{|0]  
 protected: ,s><kHJ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 'uKkl(==%  
  //}}AFX_VIRTUAL %t`SSW7I  
  // Implementation T~o{woq}g  
 protected: B&i0j5L  
  //{{AFX_MSG(CAboutDlg) Q-8'?S  
  //}}AFX_MSG E<<p_hX8R  
  DECLARE_MESSAGE_MAP() U7B/t3,=U  
}; QSF"8Uk  
{ 8f+h  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) S'!q}|7X 3  
{ =%3b@}%HqS  
 //{{AFX_DATA_INIT(CAboutDlg) M6jp1:ZH2q  
 //}}AFX_DATA_INIT ![@T iM  
} 45+%K@@x  
4j@i%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) \/*Nf?;  
{ Wyq~:vU.S  
 CDialog::DoDataExchange(pDX); 3xzkZ8]/  
 //{{AFX_DATA_MAP(CAboutDlg) fzS`dL5,W  
 //}}AFX_DATA_MAP mGe|8In  
} GjeUUmr  
Cx+WLD  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) iO*`(s  
 //{{AFX_MSG_MAP(CAboutDlg) %0yS98']g  
 // No message handlers iIsEQh  
 //}}AFX_MSG_MAP ;n} >C' :  
END_MESSAGE_MAP() (rr}Pv%yb  
Gg9VS&VI  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) j1puB  
: CDialog(CCaptureDlg::IDD, pParent) -Aa]aDAz68  
{ /Fe:h >6  
 //{{AFX_DATA_INIT(CCaptureDlg) `k(u:yGK  
  m_bControl = FALSE; }qiF^D}  
  m_bAlt = FALSE; o#xgrMB  
  m_bShift = FALSE; LZM,QQ  
  m_Path = _T("c:\\"); \T`["<  
  m_Number = _T("0 picture captured."); .73zik   
  nCount=0; hhpv\1h#  
  bRegistered=FALSE; G[3k  
  bTray=FALSE; 6x_ T@  
 //}}AFX_DATA_INIT 8M^wuRn  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 aXdf>2c{JD  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); #e.jY_  
} X*sr  
wfxOx$]z K  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4l&"]9D  
{ gEv->pc  
 CDialog::DoDataExchange(pDX); =n-z;/NL  
 //{{AFX_DATA_MAP(CCaptureDlg) ohrw\<xsu  
  DDX_Control(pDX, IDC_KEY, m_Key); g4:VR:o  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); %5JW< 9  
  DDX_Check(pDX, IDC_ALT, m_bAlt);  9<|m4  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); U_}7d"<| ?  
  DDX_Text(pDX, IDC_PATH, m_Path); B(j02<-  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 8FzHNG  
 //}}AFX_DATA_MAP ch@x]@-;A3  
} |JUe>E*  
tu\mFHvlg  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) %won=TG8  
//{{AFX_MSG_MAP(CCaptureDlg) 9W*.lf  
 ON_WM_SYSCOMMAND() $]@O/[  
 ON_WM_PAINT() x*.Ye 5Jb  
 ON_WM_QUERYDRAGICON() Yd' H+r5b  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 0Injyc*bMF  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) \\ jIl3Z  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ;rd6ko  
//}}AFX_MSG_MAP \bhOPK>w  
END_MESSAGE_MAP() 9~@<-6jE3b  
J &!B|TS  
BOOL CCaptureDlg::OnInitDialog() N-[n\}'  
{ "JkZJ#  
 CDialog::OnInitDialog(); ZCm1+Y$  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); >']+OrQH  
 ASSERT(IDM_ABOUTBOX < 0xF000); * R%.a^R  
 CMenu* pSysMenu = GetSystemMenu(FALSE); &Hv;<  
 if (pSysMenu != NULL) n0_B(997*  
 { : *ERRSL)  
  CString strAboutMenu; D" L|"qJ  
  strAboutMenu.LoadString(IDS_ABOUTBOX); cV-i*L4X  
  if (!strAboutMenu.IsEmpty()) P7z:3o.  
  { ~32Pjk~  
   pSysMenu->AppendMenu(MF_SEPARATOR); I(pb-oY3!I  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); jOs H2^  
  } BBcj=]"_  
 } '/k^C9~m r  
 SetIcon(m_hIcon, TRUE); // Set big icon (nLKQV 1  
 SetIcon(m_hIcon, FALSE); // Set small icon tG/a H%4S  
 m_Key.SetCurSel(0); ?^|QiuU:n  
 RegisterHotkey(); LI[ ?~P2\  
 CMenu* pMenu=GetSystemMenu(FALSE); Vo%Yf9C  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); )S^z+3p  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Q6=MS>JW]w  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Y2<dM/b/  
 return TRUE; // return TRUE unless you set the focus to a control a\=-D:  
} b\?3--q  
qgtn5] A  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) A8J8u,u9  
{ $,TGP+vH  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) :/B:FY=  
 { {VR`;  
  CAboutDlg dlgAbout; ( : {"C6x  
  dlgAbout.DoModal(); NS@{~;#R  
 } sGSsUO:@j;  
 else VBM/x|'  
 { j")FaIM  
  CDialog::OnSysCommand(nID, lParam);  l^P#kQA  
 } c15r':.5  
} AM'gnP>  
(^LS']ybc  
void CCaptureDlg::OnPaint() 0Q'v HZ"  
{ & 1[y"S  
 if (IsIconic()) iNQ0p:<k  
 { 22>;vM."  
  CPaintDC dc(this); // device context for painting m%pBXXfGYj  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); tRteyNA  
  // Center icon in client rectangle 402x<H  
  int cxIcon = GetSystemMetrics(SM_CXICON); ym\(PCa5`  
  int cyIcon = GetSystemMetrics(SM_CYICON); ryg4h Hspl  
  CRect rect; -ui< E?v  
  GetClientRect(&rect); .]P2}w)x?  
  int x = (rect.Width() - cxIcon + 1) / 2; oU8>Llt=$  
  int y = (rect.Height() - cyIcon + 1) / 2; u_LY\'n  
  // Draw the icon ACb/ITu  
  dc.DrawIcon(x, y, m_hIcon); s"i~6})K<$  
 } ,t1vb3  
 else }p=g*Zo*C;  
 { <c+K3P'3?  
  CDialog::OnPaint(); X8b|]Nr  
 } [SkKz>rC  
} qgx?"$ Z  
:6Pnie  
HCURSOR CCaptureDlg::OnQueryDragIcon() =NZ[${7mq  
{ D<t~e$H  
 return (HCURSOR) m_hIcon; |g<*Rk0  
} i ?;R}%~  
{^J!<k,R\;  
void CCaptureDlg::OnCancel() ]dG\j^e|  
{ T1W:>~T5#  
 if(bTray) Ql &0O27  
  DeleteIcon(); `4V"s-T'  
  CDialog::OnCancel(); ^/dS>_gtHv  
} XX2h(-  
h0Ee?=  
void CCaptureDlg::OnAbout() R-  
{ MS*G-C  
 CAboutDlg dlg; Z19m@vMsIP  
 dlg.DoModal(); ZB[k{Y  
} ong""K4H  
PK 4`5uT  
void CCaptureDlg::OnBrowse() s]H^wrg&  
{ xx }GOY.J  
 CString str; G 4qy*.  
 BROWSEINFO bi; &Jy)U  
 char name[MAX_PATH]; [ ]^X`R  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); iY~rne"l  
 bi.hwndOwner=GetSafeHwnd(); O4L#jBa+  
 bi.pszDisplayName=name; {U"^UuU]  
 bi.lpszTitle="Select folder"; Qf xH9_  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; d"ZU y!a  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi);  )\ZzTS  
 if(idl==NULL) u1Ek y/e-  
  return; j1q[c,  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); /YH`4e5g  
 str.ReleaseBuffer(); brSi<  
 m_Path=str; # ??%B  
 if(str.GetAt(str.GetLength()-1)!='\\') aXY -><  
  m_Path+="\\"; 88lxHoPV  
 UpdateData(FALSE); "NzD1k6.L  
} V*RdDF7  
}T.?c9l X  
void CCaptureDlg::SaveBmp() fP[& a9l  
{ !%PWig-  
 CDC dc; |c2 xy  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); <G ~>~L.E  
 CBitmap bm; $bsH$N#6T  
 int Width=GetSystemMetrics(SM_CXSCREEN); % /}WUP^H  
 int Height=GetSystemMetrics(SM_CYSCREEN); 909md|9K3  
 bm.CreateCompatibleBitmap(&dc,Width,Height); zl%>`k!>  
 CDC tdc; 6X)@ajGWg~  
 tdc.CreateCompatibleDC(&dc); yz\c5  
 CBitmap*pOld=tdc.SelectObject(&bm); !kL> ,O>/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); yGj.)$1},@  
 tdc.SelectObject(pOld); ;o-yQmdh  
 BITMAP btm; xHo&[{  
 bm.GetBitmap(&btm); Pc_VY>Ty  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /nZ;v4  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); {gsdG-  
 BITMAPINFOHEADER bih; 0F:1\9f5  
 bih.biBitCount=btm.bmBitsPixel; bZ 443SG  
 bih.biClrImportant=0; nSx]QREL!  
 bih.biClrUsed=0;  Paj vb-f  
 bih.biCompression=0; r~7:daG*  
 bih.biHeight=btm.bmHeight; ?_g1*@pA  
 bih.biPlanes=1; "TS  
 bih.biSize=sizeof(BITMAPINFOHEADER); H'=(`  
 bih.biSizeImage=size; e3(/qMl  
 bih.biWidth=btm.bmWidth; 6l\FIah@  
 bih.biXPelsPerMeter=0; 6#e::GD  
 bih.biYPelsPerMeter=0; ',I0ih#Ls  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); '5KeL3J;  
 static int filecount=0; atF?OP|{,w  
 CString name; 89~ =eY  
 name.Format("pict%04d.bmp",filecount++); |=dC )Azs  
 name=m_Path+name; D@oCP =m<  
 BITMAPFILEHEADER bfh; {ZsdLF#  
 bfh.bfReserved1=bfh.bfReserved2=0; 0?0Jz  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 'CR)`G_'[  
 bfh.bfSize=54+size; `ln1$  
 bfh.bfOffBits=54; D y-S98Y  
 CFile bf; ]J7Qgp)i  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 9`Q<Yy"du  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); iK()&TNz  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); H1EDMhn/  
  bf.WriteHuge(lpData,size); "v-(g9(  
  bf.Close(); !j:`7PT\  
  nCount++; GV.A+u  
 } I97yt[,Yy  
 GlobalFreePtr(lpData); s{bdl[7  
 if(nCount==1) (C;I*cv  
  m_Number.Format("%d picture captured.",nCount); HQP}w%8x  
 else  vZj`|  
  m_Number.Format("%d pictures captured.",nCount); \G |%Zw|  
  UpdateData(FALSE); MV>$BW  
} ]3iH[,KU3  
Jc6R{C  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ?.=}pAub  
{ |JF@6  
 if(pMsg -> message == WM_KEYDOWN) .L6Zm U  
 { .;7> y7$*  
  if(pMsg -> wParam == VK_ESCAPE) -O!/Jv"{,[  
   return TRUE; @`36ku  
  if(pMsg -> wParam == VK_RETURN) t2HJsMX  
   return TRUE; XFVV},V  
 } lj=l4 &.i  
 return CDialog::PreTranslateMessage(pMsg); *l&S-=]  
} eYX5(`c[  
]b/S6oc6  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m!tx(XsXU  
{ Z3TS,a1I4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !p/%lU65  
  SaveBmp(); \55VqGyxu9  
  return FALSE; Vr[czfROz'  
} _nh[(F<hz  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ yp.[HMRD  
 CMenu pop; kX`[Y@nUN  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); j=?'4sF  
 CMenu*pMenu=pop.GetSubMenu(0); SMH<'F7i  
 pMenu->SetDefaultItem(ID_EXITICON); 2 {Vcb  
 CPoint pt; M$4[)6Y  
 GetCursorPos(&pt); BQH}6ueZ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); F[ ajOb8  
 if(id==ID_EXITICON) "XgmuSQ!  
  DeleteIcon(); b89a)k>^g  
 else if(id==ID_EXIT) 'B5^P  
  OnCancel(); ?S$i?\Qh  
 return FALSE; l:#-d.z#  
} ) rW&c- '  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); :r#)z4d5  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) azQD>  
 AddIcon(); 0|&\'{  
 return res; 8lF\v/vN  
} 1NQbl+w#I  
lKWPTCU  
void CCaptureDlg::AddIcon() ~S,p?I  
{ mrIh0B:`  
 NOTIFYICONDATA data; 7\]E~/g  
 data.cbSize=sizeof(NOTIFYICONDATA); 7/7Z`  
 CString tip; sg'pO*_&  
 tip.LoadString(IDS_ICONTIP); k3?rp`V1  
 data.hIcon=GetIcon(0); ;W>Cqg=  
 data.hWnd=GetSafeHwnd(); c~QS9)=E  
 strcpy(data.szTip,tip); =OIw*L8C"I  
 data.uCallbackMessage=IDM_SHELL; {@! Kx`(:  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 'r1LSht'  
 data.uID=98; zDhB{3-Q1{  
 Shell_NotifyIcon(NIM_ADD,&data); H{J'# 9H  
 ShowWindow(SW_HIDE); g~V+4+  
 bTray=TRUE; qd3Q}Lk  
} ~Tbj=f  
4P^6oh0"  
void CCaptureDlg::DeleteIcon() (C4fG@n  
{ Lip4)Y [  
 NOTIFYICONDATA data; 3(TsgP >`  
 data.cbSize=sizeof(NOTIFYICONDATA); dL7E<?l  
 data.hWnd=GetSafeHwnd(); bVP"(H]  
 data.uID=98; n  -(  
 Shell_NotifyIcon(NIM_DELETE,&data); su*Pk|6%  
 ShowWindow(SW_SHOW); qW:HNEiir  
 SetForegroundWindow(); kmzH'wktt  
 ShowWindow(SW_SHOWNORMAL); 6T 8!xyi-+  
 bTray=FALSE; DCqY|4Qc  
} .ERO|$fv  
]Q]W5WDe:  
void CCaptureDlg::OnChange() f&v9Q97=  
{ 9zYVC[o  
 RegisterHotkey();  :Gm/  
} AJ#Nenmj  
SBA?^T  
BOOL CCaptureDlg::RegisterHotkey() g&/T*L  
{ iq( )8nxi  
 UpdateData(); 6aM*:>C"  
 UCHAR mask=0; =UyLk-P w  
 UCHAR key=0; bfo["  
 if(m_bControl) 45hF`b>%,  
  mask|=4; ca+5=+X7  
 if(m_bAlt)  {o(j^@  
  mask|=2; q, O$ %-70  
 if(m_bShift) n; {76Q  
  mask|=1; YPHS 1E?  
  key=Key_Table[m_Key.GetCurSel()]; LL:_L<  
 if(bRegistered){ k)EX(T\  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); >EY3/Go>  
  bRegistered=FALSE; vpmj||\-  
 } }&_/PA0j  
 cMask=mask; MEB it  
 cKey=key; RX/hz|   
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); vWAL^?HUP  
 return bRegistered; d!eYqM7-G  
} "DYJ21Ut4  
U&O: _>~  
  四、小结 N-lkYL-%\j  
E>l~-PaZY  
  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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