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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: p7ir*r/2  
  zd]D(qeX  
  一、实现方法 ,+;:3gRk9  
{u[V{XIUh  
  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: %Rh;=p`  
!vn1v)6  
#pragma data_seg("shareddata") ^VT1vu %03  
HHOOK hHook =NULL; //钩子句柄 efG6v  
UINT nHookCount =0; //挂接的程序数目 "C?5f]T  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 AkU<g  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?%O3Oi Xz  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 9e U[*S  
static int KeyCount =0; _al|'obomy  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 =&dW(uyzY  
#pragma data_seg() 7DKz;o  
Kd3?I5t  
  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。 0Y]0!}  
aS}1Q?cU  
  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: &t(0E:^TRU  
N 4K8 u'f^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR XCsiEKZ_i  
cKey,UCHAR cMask) IkzTJ%>  
{ q4UA]+-*  
 BOOL bAdded=FALSE; =N);v\ Q$!  
 for(int index=0;index<MAX_KEY;index++){ 0lM{l?  
  if(hCallWnd[index]==0){ )c/Fasfg[P  
   hCallWnd[index]=hWnd; 8wH.et25k  
   HotKey[index]=cKey; "&Qctk`<P  
   HotKeyMask[index]=cMask; ?8, %LIQ?  
   bAdded=TRUE; <As9>5|%  
   KeyCount++; g`k?AM\  
   break; )U:2z-X&e  
  } /$"[k2 N  
 } QFPfIb/  
 return bAdded; Y`6rEA0  
} L?Yoh<  
//删除热键 Z.i{i^/#(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %b?$@H-Re  
{ 6+K_Z\  
 BOOL bRemoved=FALSE; 1\L[i];L8  
 for(int index=0;index<MAX_KEY;index++){ (x;g/!:  
  if(hCallWnd[index]==hWnd){ hIJ)MZU|  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~^)^q8  
    hCallWnd[index]=NULL; -V % gVI[  
    HotKey[index]=0; 2eQdQwX  
    HotKeyMask[index]=0; ?yXAu0  
    bRemoved=TRUE; %OcGdbs  
    KeyCount--; 'rb'7=z5  
    break; XH7xT@  
   } :RxHw;!  
  } DZ ^1s~  
 } s]27l3)B  
 return bRemoved; HjWq[[Nz  
} W</n=D<,I  
*oI*-C  
bVr*h2 p  
  DLL中的钩子函数如下: Z< b"`ty.  
4\ /*jA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) G&eP5'B4i  
{ qu6DQ@ ~YC  
 BOOL bProcessed=FALSE; mV9A{h  
 if(HC_ACTION==nCode) K,xW6DiH  
 { w-N1.^  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 @LD6:gy  
   switch(wParam) Lp:6 ;  
   {  >n.z)ZJ  
    case VK_MENU: m:Go-tk  
     MaskBits&=~ALTBIT; >x:EJV   
     break; X7*`  
    case VK_CONTROL: fn{S "33"  
     MaskBits&=~CTRLBIT; J?:[$C5  
     break; )wzV $(~  
    case VK_SHIFT: 7q9gngT1LA  
     MaskBits&=~SHIFTBIT; Q}2[hB  
     break; x;BbTBc>  
    default: //judge the key and send message E^ h=!RW{  
     break; f%qt)Ick  
   } ?Ce#BwQ>  
   for(int index=0;index<MAX_KEY;index++){ Vs 0 SXj  
    if(hCallWnd[index]==NULL) I12KT~z<r  
     continue; {#Q\z>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) farDaS[\VY  
    { N1--~e  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u~ F ;x Q  
     bProcessed=TRUE; e5v`;(^M  
    } GtI6[ :1t  
   } 6DSH`-;  
  } {6vEEU  
  else if((lParam&0xc000ffff)==1){ //有键按下 !#D=w$@r:  
   switch(wParam) bNzqls$  
   { }3/~x  
    case VK_MENU: vrl[BPI  
     MaskBits|=ALTBIT; *ftC_v@p5  
     break; ]Nk!4"  
    case VK_CONTROL: s'a=_cN  
     MaskBits|=CTRLBIT; ;\)=f6N  
     break; fJ80tt?r  
    case VK_SHIFT: %EbiMo ]3B  
     MaskBits|=SHIFTBIT; :9d\Uj,  
     break; ZKbDp~  
    default: //judge the key and send message V/#v\*JHFc  
     break; \ a-CN>  
   } .5tg4%l  
   for(int index=0;index<MAX_KEY;index++){ X1J;1hRUP  
    if(hCallWnd[index]==NULL) Bmr<O !  
     continue; * crw^e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ')PVGV(D+  
    { !r&Bn6*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ij)Cm]4(2  
     bProcessed=TRUE; 7t(Y;4<2  
    } : 1)}Epo,  
   } }#N]0I)JI  
  } o$bUY7_  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 _3^y|_!  
   for(int index=0;index<MAX_KEY;index++){ 9k2,3It  
    if(hCallWnd[index]==NULL) KXBL eR&^  
     continue; R ZcH+?7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 'wQy]zm$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ] V G?+  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 saK;[&I*  
   } (ppoW  
  } a>Re^GT+z  
 } b&t[S[P.V  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2>y:N.  
} @5Qoi~o  
F,Fo}YQX  
  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: V2`;4dX*2  
c;V D}UD'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P1d,8~;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 03E3cp"  
Sb<\-O14"  
  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|VTM  
QPg2Y<2  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) u(vw|nj`  
{ E[S':Q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) @W9H9 PWv&  
 { i!~>\r\6\  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 zHFTCL>"  
  SaveBmp(); .ewZV9P)t  
  return FALSE; ,t~sV@ap  
 } x0x $  9  
 …… //其它处理及默认处理 kEAhTh&g*  
} ,olwwv_8G  
@\!!t{y  
u6_jnZGB  
  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。 fPE?hG<x  
^CQ1I0  
  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。 O)5 #Fcp(  
#S?c ;3-  
  二、编程步骤 'Oy5e@G+?  
rt.[,m  
  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[=C_+2  
.~<]HAwq  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; y&rY0bm  
XtW_  
  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; 4I ,o&TK  
pN k8! k  
  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; a!u3 HS-i  
R~c1)[[E  
  5、 添加代码,编译运行程序。 Jk*QcEE=  
DcU C,  
三、程序代码 Q&wYc{TUbm  
+ U5U.f%  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL h ]}`@M"  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 3:" &Z6t#  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ V_M@g;<o  
#if _MSC_VER > 1000 SQIdJG^:  
#pragma once 0^iJlR2  
#endif // _MSC_VER > 1000 44Qk;8*  
#ifndef __AFXWIN_H__ ? Q:PPqQ  
#error include 'stdafx.h' before including this file for PCH > ZDC . ~  
#endif 2fBYT4*P;  
#include "resource.h" // main symbols s"rg_FoL  
class CHookApp : public CWinApp .\4l'THn,0  
{ K{FhT9R'  
 public: Z!)f*  
  CHookApp(); Qdm(q:w  
  // Overrides lVT&+r~r  
  // ClassWizard generated virtual function overrides [D9:A  
  //{{AFX_VIRTUAL(CHookApp) =+(Q.LmhC  
 public: l'2H 4W_+  
  virtual BOOL InitInstance(); y*|L:!   
  virtual int ExitInstance(); }z{wQ\  
  //}}AFX_VIRTUAL '_E c_F  
  //{{AFX_MSG(CHookApp) ^6&_| f  
  // NOTE - the ClassWizard will add and remove member functions here. _=T]PSauI  
  // DO NOT EDIT what you see in these blocks of generated code ! + o{*r#  
  //}}AFX_MSG f-]><z  
  DECLARE_MESSAGE_MAP() %(NN *o9"q  
}; dk4D+*R  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); UFk!dK+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \!7*(&yly  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7uA\&/ ,  
BOOL InitHotkey(); '{W3j^m7  
BOOL UnInit(); M/)B" q  
#endif *s36O F!  
1O9$W?)Q  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. j #es2;  
#include "stdafx.h" #rq?f  
#include "hook.h" Bpas[2gYC  
#include <windowsx.h> +yIL[D  
#ifdef _DEBUG -PXoMZx%  
#define new DEBUG_NEW 7A[Ogro  
#undef THIS_FILE jRwa0Px(  
static char THIS_FILE[] = __FILE__; mOSCkp{<e  
#endif \3: L Nt  
#define MAX_KEY 100 6.UKB<sV  
#define CTRLBIT 0x04 ip674'bq7R  
#define ALTBIT 0x02 jB/V{Y#y9@  
#define SHIFTBIT 0x01 %U:C|  
#pragma data_seg("shareddata") |87W*  
HHOOK hHook =NULL; lkN'uZ  
UINT nHookCount =0; 0ZT 0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey *CT.G'bQX  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Bj+wayMi  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Ba<#1p7_  
static int KeyCount =0; YkVRl [  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @7]\y7D  
#pragma data_seg() p&m ^IWD  
HINSTANCE hins; _Z0\`kba+  
void VerifyWindow(); `+Xe'ey  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) c-|kv[\a  
//{{AFX_MSG_MAP(CHookApp) \E~Q1eAJT  
// NOTE - the ClassWizard will add and remove mapping macros here. |thad!?  
// DO NOT EDIT what you see in these blocks of generated code! CJ:uYXJJ:z  
//}}AFX_MSG_MAP /xF 9:r  
END_MESSAGE_MAP() 6VGo>b;  
$oc9 |Q 7  
CHookApp::CHookApp() %-k(&T3&  
{ O68bzi]  
 // TODO: add construction code here, <(Tiazg  
 // Place all significant initialization in InitInstance +!G4tA$g  
} p ^](3Vi(  
R^|!^[WE  
CHookApp theApp; 8Y7 @D$=w  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) srhFEmgN7)  
{ -S7RRh'p  
 BOOL bProcessed=FALSE; ` -yhl3si  
 if(HC_ACTION==nCode) cJ2y)`  
 { %5`r-F  
  if((lParam&0xc0000000)==0xc0000000){// Key up +fkP+RVY  
   switch(wParam) QT7_x`#J~o  
   { \y@ eBW  
    case VK_MENU: 8KZ$ F>T]>  
     MaskBits&=~ALTBIT; Pb3EnNqYbM  
     break; Z%KL[R}^w;  
    case VK_CONTROL: |E? ,xWN  
     MaskBits&=~CTRLBIT; |c=d;+  
     break; U>bP}[&S  
    case VK_SHIFT: g&q^.7c}  
     MaskBits&=~SHIFTBIT; $m{{,&}k  
     break; OX`?<@6  
    default: //judge the key and send message X1O65DMr`g  
     break; wXP_]-  
   } /#@LRN<oCq  
   for(int index=0;index<MAX_KEY;index++){ %;'~%\|dZM  
    if(hCallWnd[index]==NULL) B%)zGTp6  
     continue; Q Xsfp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :l4^iSf  
    { ysL0hwir  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); s87 a %  
     bProcessed=TRUE; ,!jR:nApE  
    } >'ie!VW@  
   } f(^33k  
  } ^NY+wR5Sn  
  else if((lParam&0xc000ffff)==1){ //Key down 7xz#D4[  
   switch(wParam) |}:e+?{o  
   { Zp^)_ 0  
    case VK_MENU: LH bZjZ2  
     MaskBits|=ALTBIT; %f_FGh  
     break; FYxUOO  
    case VK_CONTROL: b8eDD+ulk  
     MaskBits|=CTRLBIT; m=#aHF  
     break; ?`za-+<r<  
    case VK_SHIFT: ZDW,7b% U  
     MaskBits|=SHIFTBIT; #W_i{bdO  
     break; SnH:(tO[X  
    default: //judge the key and send message GOUY_&}tL  
     break; =;kRk .qzy  
   } i:MlD5 F  
   for(int index=0;index<MAX_KEY;index++) l kI8 {  
   { [^h/(a`  
    if(hCallWnd[index]==NULL) "tqS|ok.  
     continue; unx;m$-c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X*_ SHt  
    { :8GlyN<E  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); e!TG< (S  
     bProcessed=TRUE; =ltbSf7  
    } TXA. 6e  
   } pZyb  
  } GjG{qR  
  if(!bProcessed){ c& 9+/JYMo  
   for(int index=0;index<MAX_KEY;index++){ l_UXrnm/N  
    if(hCallWnd[index]==NULL) rOs)B21/  
     continue; u?F7 L8q]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) e{c._zr,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,)0/Ec  
   } cpP.7ZR  
  } ;4+qPWwq8W  
 }  ]H@v  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); r0rJ.}!  
} 1"mnzbf8*  
AaJ,=eQ  
BOOL InitHotkey() @SX%? mk8G  
{ [GcA.ABz  
 if(hHook!=NULL){ A}az m>  
  nHookCount++; d,Im&j_Z  
  return TRUE; ]9bh+  
 } -U/I'RDLEz  
 else X; e`y:9  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); CUAg{]  
  if(hHook!=NULL) KfJ c  
   nHookCount++; l:>qR/|m  
  return (hHook!=NULL); |;x fe"]  
} (:tTx>V#  
BOOL UnInit() ~ex~(AWh  
{ S-H-tFy\\  
 if(nHookCount>1){ S jC)6mo  
  nHookCount--; Requ.?!fG;  
  return TRUE; iKR8^sj7S  
 } o3kt0NuF,  
 BOOL unhooked = UnhookWindowsHookEx(hHook); G_7ks]u-  
 if(unhooked==TRUE){ m-~V+JU;x  
  nHookCount=0; 75QXkJu  
  hHook=NULL; F[Guy7?O  
 } j]cXLY  
 return unhooked; A8A:@-e8A  
} uIVTs9\  
*!wO:< -  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .3S\Rrv  
{ '#pMEVP  
 BOOL bAdded=FALSE; -(%ar%~Zd  
 for(int index=0;index<MAX_KEY;index++){ mjkw&2  
  if(hCallWnd[index]==0){ 3Vb=6-|  
   hCallWnd[index]=hWnd; LOyCx/n  
   HotKey[index]=cKey; USHlb#*  
   HotKeyMask[index]=cMask; KoxGxHz^Y3  
   bAdded=TRUE; b a1$kU  
   KeyCount++; Ppi-skT  
   break; q9g[+*9]$  
  } V'f&JQ A  
 } VR5e CJ:i  
 return bAdded; }uV?  
} EL2hD$  
$Hl+iF4j<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l&e5_]+%  
{ zx_O"0{5  
 BOOL bRemoved=FALSE; -Ib+#pX  
 for(int index=0;index<MAX_KEY;index++){ auyKLT3C  
  if(hCallWnd[index]==hWnd){ ?-RoqF  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1OfSq1G>v$  
    hCallWnd[index]=NULL; c:`` Y:  
    HotKey[index]=0; FBwncG$]F*  
    HotKeyMask[index]=0; ;?O883@r8  
    bRemoved=TRUE; xqi*N13  
    KeyCount--; ]IbPWBX  
    break; r=iMo7q  
   } ~_# Y,)S!z  
  } d =B@EyN  
 } J;Z>fAE7  
 return bRemoved; yccuTQvz  
} Wzf1-0t  
f3%^-Uy*b  
void VerifyWindow() S,)|~#5x  
{ ` + n  
 for(int i=0;i<MAX_KEY;i++){ Zh fD`@>&  
  if(hCallWnd!=NULL){ ="'P=Xh!8  
   if(!IsWindow(hCallWnd)){ fa*H cz  
    hCallWnd=NULL; ,:dEEL+>c  
    HotKey=0; 9 z8<[>  
    HotKeyMask=0;  i?i7T`  
    KeyCount--; iz%A0Z+`bg  
   } #$vhC u<I  
  } "Wn?8vR  
 } P!4{#'_}  
} fEv<W  
 HN~v&,  
BOOL CHookApp::InitInstance() /v;)H#;  
{ #ejw@bd  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Jv4D^>yj[  
 hins=AfxGetInstanceHandle(); bsk=9K2_2t  
 InitHotkey(); +=B}R  
 return CWinApp::InitInstance(); sP3.s_U^  
} _WjETyh [H  
Uf2v$Jl+Yh  
int CHookApp::ExitInstance() Kn!0S<ssR  
{ z kX-"}$8  
 VerifyWindow(); dbq{a  
 UnInit(); #@\NdW\  
 return CWinApp::ExitInstance(); afP&+ 5t@O  
} UmD-7Fd  
%&=(,;d  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?3"D| cS1  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) gA 6h5F)_  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ,p/b$d1p  
#if _MSC_VER > 1000 !$KhL.4P  
#pragma once Mn }Z9S[  
#endif // _MSC_VER > 1000 ("J V:u.L+  
1J{z}yPHc  
class CCaptureDlg : public CDialog gt t$O  
{ w#G=Z_Tt  
 // Construction _AFt6\  
 public: eDM0417O(  
  BOOL bTray; ";S*[d.2tA  
  BOOL bRegistered; ~q_+;W.  
  BOOL RegisterHotkey(); @y\{<X.F\1  
  UCHAR cKey; VgZaDd;  
  UCHAR cMask; Uh|__DUkh  
  void DeleteIcon(); c%LB|(@j{  
  void AddIcon(); b\0Q:  
  UINT nCount; .dKRIFo  
  void SaveBmp(); yL3<X w|  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7U[L\1zS  
  // Dialog Data | 8L`osg  
  //{{AFX_DATA(CCaptureDlg) %d[xr h  
  enum { IDD = IDD_CAPTURE_DIALOG }; rX>y>{w~  
  CComboBox m_Key;  ZV q  
  BOOL m_bControl; L]}RSE2  
  BOOL m_bAlt; n-b<vEZw#  
  BOOL m_bShift; P7k$^n  
  CString m_Path; k@";i4}A  
  CString m_Number; Rn~Xu)@e  
  //}}AFX_DATA ME10dr  
  // ClassWizard generated virtual function overrides yDkDtO`K  
  //{{AFX_VIRTUAL(CCaptureDlg) 61rh\<bn  
 public: *"QE1Fum'  
  virtual BOOL PreTranslateMessage(MSG* pMsg); >5@vY?QXO  
 protected: })0 7u  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support PSQ:'  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `)C`_g3Ew  
  //}}AFX_VIRTUAL &<P^Tvqq&  
  // Implementation v yLAs;  
 protected: v.2Vg  
  HICON m_hIcon; `Ig2f$}  
  // Generated message map functions 5f*'wA  
  //{{AFX_MSG(CCaptureDlg) vsz^B :j  
  virtual BOOL OnInitDialog(); lQ<n dt~  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); zI:5I@ X  
  afx_msg void OnPaint(); d,rEEc Y  
  afx_msg HCURSOR OnQueryDragIcon(); *JC{G^|Y  
  virtual void OnCancel(); C.B}Py+   
  afx_msg void OnAbout(); WKIiJ{@L  
  afx_msg void OnBrowse(); L,A-G"z0Z  
  afx_msg void OnChange(); 6L> "m0  
 //}}AFX_MSG 7@cvy? v{  
 DECLARE_MESSAGE_MAP() \y )4`A  
}; PLD'Q,R  
#endif )(!Z90@  
7CL@i L Tq  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file g&F<Uv#mZ  
#include "stdafx.h" A{Htpm~  
#include "Capture.h" )>M@hIV5>  
#include "CaptureDlg.h" '-]BSU  
#include <windowsx.h> qddT9U|8~  
#pragma comment(lib,"hook.lib") 8!%"/*P$  
#ifdef _DEBUG ~W*j^+T"  
#define new DEBUG_NEW &aAo:pj  
#undef THIS_FILE -%V-'X5  
static char THIS_FILE[] = __FILE__; U9fF;[g  
#endif 4x{ti5Y0  
#define IDM_SHELL WM_USER+1 S1= JdN  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ODvpMt:+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jG(~9P7  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; RGA*7  
class CAboutDlg : public CDialog 5m7Ax] \  
{ xOyL2   
 public: P5xmLefng  
  CAboutDlg(); wYMX1=  
  // Dialog Data jzA8f+:q  
  //{{AFX_DATA(CAboutDlg) r\ Yur  
  enum { IDD = IDD_ABOUTBOX }; >;r05,mc  
  //}}AFX_DATA dlzamoS@AR  
  // ClassWizard generated virtual function overrides g7z9i[  
  //{{AFX_VIRTUAL(CAboutDlg) JR<-'  
 protected: y^46z( I  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3R:i*8C  
  //}}AFX_VIRTUAL <.(/#=2  
  // Implementation z slEUTj)  
 protected: u&_U CJCf  
  //{{AFX_MSG(CAboutDlg) @OY-(cW  
  //}}AFX_MSG Bt7v[Ot   
  DECLARE_MESSAGE_MAP() 10 H!  
}; k Q(y^tW  
)$4DH:WN  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ]a|;G  
{ w:zC/5x`  
 //{{AFX_DATA_INIT(CAboutDlg) Y <k,E  
 //}}AFX_DATA_INIT jh&vq=P H  
} C$ `Y[w  
h}&IlDG  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) N_Ld,J%g  
{ OwIy(ukTI  
 CDialog::DoDataExchange(pDX); N~J Eia%  
 //{{AFX_DATA_MAP(CAboutDlg) 8si^HEQ8  
 //}}AFX_DATA_MAP ~[y+B0I3  
}  de47O  
.) ;:K  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) <slq1  
 //{{AFX_MSG_MAP(CAboutDlg) Tn-]0hWkP  
 // No message handlers A":b_!sW  
 //}}AFX_MSG_MAP >D4Ez  
END_MESSAGE_MAP() 6jo&i  
B]F7t4Y!  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) p}7&x[fTLk  
: CDialog(CCaptureDlg::IDD, pParent) P}QbxkS 8  
{ 9ufs6 z  
 //{{AFX_DATA_INIT(CCaptureDlg) h:sG23@=  
  m_bControl = FALSE; r K)  
  m_bAlt = FALSE; []!r|R3  
  m_bShift = FALSE; YY~=h5$  
  m_Path = _T("c:\\"); `#8R+c=$  
  m_Number = _T("0 picture captured."); OT3;qT*fw  
  nCount=0; M #&L@fg!  
  bRegistered=FALSE; c!^}!32j)  
  bTray=FALSE; V>92/w.fe  
 //}}AFX_DATA_INIT <1.mm_pw  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 -%) !XB  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;O|63  
} 2B dr#qr  
`2+e\%f/0  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) |6^ K  
{ Z?' |9FM  
 CDialog::DoDataExchange(pDX); ea>\.D-S  
 //{{AFX_DATA_MAP(CCaptureDlg) 1W<_5 j_  
  DDX_Control(pDX, IDC_KEY, m_Key); T@Z{KV"S  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); #de^~  
  DDX_Check(pDX, IDC_ALT, m_bAlt); -Ep6 .v  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); aW$nNUVD  
  DDX_Text(pDX, IDC_PATH, m_Path); Z x%@wH~  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 4yv31QG$  
 //}}AFX_DATA_MAP RcP5].^T  
} iZ\z!tHR  
-JK4-Hg  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) d( g_y m*  
//{{AFX_MSG_MAP(CCaptureDlg) yvisoZX  
 ON_WM_SYSCOMMAND() j1+Y=@MA  
 ON_WM_PAINT() zL8A?G)= M  
 ON_WM_QUERYDRAGICON() @2*6+w_Ae  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) tgA |Vwwk  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) s2=X>,kz?  
 ON_BN_CLICKED(ID_CHANGE, OnChange) S9oGf  
//}}AFX_MSG_MAP ]X|G+[Ujv  
END_MESSAGE_MAP() "]Td^Nxi  
!PIdw~YC  
BOOL CCaptureDlg::OnInitDialog() <j3HT"^[D  
{ +qf{ '|H  
 CDialog::OnInitDialog(); hO@3-SRa,k  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); yv4PK*  
 ASSERT(IDM_ABOUTBOX < 0xF000); Asu"#sd  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Lo9?,^S  
 if (pSysMenu != NULL) Vnb#N4vR  
 { 3[Iw%% q  
  CString strAboutMenu;  )6+W6:  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Y g?{x@  
  if (!strAboutMenu.IsEmpty()) 0Jh:6F  
  { *=@pdQkR  
   pSysMenu->AppendMenu(MF_SEPARATOR); s9Z2EjQV  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 8:fiO|~%  
  } K.m[S[cy  
 } mDf WR  
 SetIcon(m_hIcon, TRUE); // Set big icon ]t;5kj/  
 SetIcon(m_hIcon, FALSE); // Set small icon ]bweQw@i  
 m_Key.SetCurSel(0); X-F HJ4  
 RegisterHotkey(); #?6RoFgMe  
 CMenu* pMenu=GetSystemMenu(FALSE); ? d\8Q't*  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Ntiz-qW  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); x)L@x Q  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); IyP].g1"U  
 return TRUE; // return TRUE unless you set the focus to a control X&Lt?e,&  
} =T$- #bA)  
]#n4A|&H  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) NLY5L7  
{ K_n%`5  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) &_j4q  
 { P$I\)Q H  
  CAboutDlg dlgAbout; =C)1NJx&~  
  dlgAbout.DoModal(); HCK4h DKo}  
 } bp,CvQ'}a  
 else -m/4\D  
 { qDAjW)w Jp  
  CDialog::OnSysCommand(nID, lParam); T<)z2Bi  
 } M7 !" t  
} E76:}(  
BUyA]  
void CCaptureDlg::OnPaint() --kK<9J7  
{ sKO ;p  
 if (IsIconic()) )zo ;r!eP  
 { I#U44+c  
  CPaintDC dc(this); // device context for painting _@2G]JD  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); e IA=?k.y  
  // Center icon in client rectangle J]B5w{??b  
  int cxIcon = GetSystemMetrics(SM_CXICON); N<99K!   
  int cyIcon = GetSystemMetrics(SM_CYICON); Z]BR Mx  
  CRect rect; gBu4`M  
  GetClientRect(&rect); lV'83  
  int x = (rect.Width() - cxIcon + 1) / 2; =w-H )  
  int y = (rect.Height() - cyIcon + 1) / 2; EA.U>5Fq  
  // Draw the icon &=bI3-  
  dc.DrawIcon(x, y, m_hIcon); 2-84  
 } |=s3a5sl  
 else KK</5Aw9p  
 { MzD0F#Y  
  CDialog::OnPaint(); $ 1U%E  
 } @4$E.q<0  
} +$5^+C\6A  
K<GCP2  
HCURSOR CCaptureDlg::OnQueryDragIcon() W6Pg:Il7  
{ t/|^Nt@XT  
 return (HCURSOR) m_hIcon; Di*>PE@  
} 6-"&jbvm  
:xCobMs_/  
void CCaptureDlg::OnCancel() ny=iAZM>q  
{ F1>,^qyG6  
 if(bTray) 9lv 2  
  DeleteIcon(); x}d\%* B  
  CDialog::OnCancel(); rej[G!  
} t ,$)PV  
*Y Ox`z!R  
void CCaptureDlg::OnAbout() WM26-nR  
{ A_%w (7o"  
 CAboutDlg dlg; ] ?(=rm9u  
 dlg.DoModal(); ]mSVjF3l  
} ?L^ Gu ]y  
{Hu0  
void CCaptureDlg::OnBrowse()  >pKI'  
{ Gj=il-Po  
 CString str; Ry C7  
 BROWSEINFO bi; bxs@_fH  
 char name[MAX_PATH]; z61 o6mb  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); $G3P3y: [  
 bi.hwndOwner=GetSafeHwnd(); h*LIS@&9C5  
 bi.pszDisplayName=name; }qTvUs  
 bi.lpszTitle="Select folder"; $`%.Y&A  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; RS~oSoAE  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); @kw=0  
 if(idl==NULL) \#slZ;&s  
  return; Lst5  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ( C&f~U  
 str.ReleaseBuffer(); R<-KXT9  
 m_Path=str; &3<]FK  
 if(str.GetAt(str.GetLength()-1)!='\\') &!ZpBR(  
  m_Path+="\\"; A@UnrbX:  
 UpdateData(FALSE); bPNsy@"6  
} a'BBp6  
1Q<a+ l  
void CCaptureDlg::SaveBmp() i&Ea@b  
{ eo!z>9#.  
 CDC dc;  BeQJ/`  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); eW/Hn  
 CBitmap bm; Ax ^9J)C  
 int Width=GetSystemMetrics(SM_CXSCREEN); \;}dS SB1  
 int Height=GetSystemMetrics(SM_CYSCREEN); "TPMSx&Ei  
 bm.CreateCompatibleBitmap(&dc,Width,Height); o%:eYl  
 CDC tdc; g:HIiGN0Ic  
 tdc.CreateCompatibleDC(&dc); 2sngi@\  
 CBitmap*pOld=tdc.SelectObject(&bm); A.n1|Q#  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); RW 5T}  
 tdc.SelectObject(pOld); a^BD55d?  
 BITMAP btm; T~la,>p|}  
 bm.GetBitmap(&btm); c}A^0,"z>  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; AOpfByw  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); fOfp.`n  
 BITMAPINFOHEADER bih; YpJzRm{Ra  
 bih.biBitCount=btm.bmBitsPixel; Hogr#Sn2  
 bih.biClrImportant=0; |c) #zSv  
 bih.biClrUsed=0; ec|IT0;  
 bih.biCompression=0; {PZe!EQ  
 bih.biHeight=btm.bmHeight; 3iB8QO;pp  
 bih.biPlanes=1; Nbr{)h  
 bih.biSize=sizeof(BITMAPINFOHEADER); `g7' )MSy  
 bih.biSizeImage=size; q07>FW R  
 bih.biWidth=btm.bmWidth; ;RXv%ML  
 bih.biXPelsPerMeter=0; ]Sh&8 #  
 bih.biYPelsPerMeter=0; m9/a!|fBE  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); a.P^+h  
 static int filecount=0; <iMLM<J<w  
 CString name; '2NeuK-KD  
 name.Format("pict%04d.bmp",filecount++); --FvE|I  
 name=m_Path+name; yDPek*#^"q  
 BITMAPFILEHEADER bfh; /)~M cP3  
 bfh.bfReserved1=bfh.bfReserved2=0; bz1\EkLL  
 bfh.bfType=((WORD)('M'<< 8)|'B'); bkb}M)C  
 bfh.bfSize=54+size; {+!_; zzZ  
 bfh.bfOffBits=54; PqfH}d0l  
 CFile bf; ^pn:SV  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ s:%>H|-  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); NFQ0/iuW  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); l 1@:&j3h  
  bf.WriteHuge(lpData,size); `|gCbs95  
  bf.Close(); GFvOrRlP\  
  nCount++; BP`UB  
 } yY}`G-)g~*  
 GlobalFreePtr(lpData); T6tJwSS4:  
 if(nCount==1) bcQ$S;U)  
  m_Number.Format("%d picture captured.",nCount); U9Sp$$L  
 else dG1qrh9_-  
  m_Number.Format("%d pictures captured.",nCount); Rc u/ @j{O  
  UpdateData(FALSE); {|qz>  
} N7|ctO  
6uDNqq  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) s;>jy/o0 s  
{ , =#'?>Kq  
 if(pMsg -> message == WM_KEYDOWN) Ox58L>:0m  
 { Q~jUZ-qN  
  if(pMsg -> wParam == VK_ESCAPE) @rE>D  
   return TRUE; W)KV"A3C  
  if(pMsg -> wParam == VK_RETURN) 8$1<N  
   return TRUE; ]1X];x&e  
 } wuPx6hCl  
 return CDialog::PreTranslateMessage(pMsg); \5Hfe;ny-~  
} T3\Q<  
@hk~8y]rz  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #fQStO  
{ 8kk$:8  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ;#AV~Y- s  
  SaveBmp(); j &~OR6  
  return FALSE; ;%Qu;FtC  
} S^3I"B  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ J5429Soo  
 CMenu pop; dH8H<K~  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 9T)-|fja_  
 CMenu*pMenu=pop.GetSubMenu(0); C/)Xd^#  
 pMenu->SetDefaultItem(ID_EXITICON); .Ir5gz  
 CPoint pt; =V(I  
 GetCursorPos(&pt); gVO[R6C5C  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); F;kNc:X`)  
 if(id==ID_EXITICON) Y6+nfh_  
  DeleteIcon(); hS<+=3 <M  
 else if(id==ID_EXIT) >xT8[  
  OnCancel(); -e30!A  
 return FALSE; tv5SQ+AI3  
} 0C7x1:  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); G"wy?  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0Y{A  
 AddIcon(); yKi* 8N"e<  
 return res; h&&ufF]D  
} $Die~rPU  
O.}{s;  
void CCaptureDlg::AddIcon() @Kp2l<P  
{  kf';"  
 NOTIFYICONDATA data; oGa8}Vtc  
 data.cbSize=sizeof(NOTIFYICONDATA); 8@Pv nOL  
 CString tip; 3#W>  
 tip.LoadString(IDS_ICONTIP); 2-FL&DE  
 data.hIcon=GetIcon(0); VGkwrS;+I  
 data.hWnd=GetSafeHwnd(); t=5 K#SX}  
 strcpy(data.szTip,tip); K^EW*6vB8O  
 data.uCallbackMessage=IDM_SHELL; Ao(Xz$cQfW  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; YHl6M&*@  
 data.uID=98; IF<pT)  
 Shell_NotifyIcon(NIM_ADD,&data); awGI|d  
 ShowWindow(SW_HIDE); 9%pq+?u9  
 bTray=TRUE; tQF,E&Jo8  
} &0~E+ 9b  
8ex{N3  
void CCaptureDlg::DeleteIcon() Hr:WE+'  
{ K%O%#Kk  
 NOTIFYICONDATA data; A?=g!(wB  
 data.cbSize=sizeof(NOTIFYICONDATA); *zJ}=%)f  
 data.hWnd=GetSafeHwnd(); e+j7dmGa  
 data.uID=98; TN4gGky!  
 Shell_NotifyIcon(NIM_DELETE,&data); W-2,QVp%  
 ShowWindow(SW_SHOW); ,F]Y,"x:  
 SetForegroundWindow(); YP/BX52 v  
 ShowWindow(SW_SHOWNORMAL); }[k~JXt  
 bTray=FALSE; O$+0 .  
} 4u0=/pfi[  
gh#9<  
void CCaptureDlg::OnChange() xx_]e4  
{ g?qm >X  
 RegisterHotkey(); 1ve %xF  
} HTA Jn_  
e<#t]V  
BOOL CCaptureDlg::RegisterHotkey() 9 "7(Jq  
{ l~.ae,|7  
 UpdateData(); W$=Ad *  
 UCHAR mask=0; 8HDYA$L  
 UCHAR key=0; ( $A0b  
 if(m_bControl) }KcvNK (  
  mask|=4;  \9N1:  
 if(m_bAlt) Z_Qs^e$  
  mask|=2; ,3=|a|p  
 if(m_bShift) 9KkxUEkW  
  mask|=1; LB1LQ 0M  
  key=Key_Table[m_Key.GetCurSel()]; hOG9  
 if(bRegistered){ [@(M%  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Bvb.N$G  
  bRegistered=FALSE; E<y0;l?H<  
 } u_shC"X:  
 cMask=mask; B&3oo   
 cKey=key; Iy% fg',%  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); V.?N29CA|  
 return bRegistered; |uf{:U)  
} xM"k qRZ  
pUi|&F K">  
  四、小结 2dg+R)%  
F%M4i`Vh  
  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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