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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: 9X {nJ"  
  L5k>;|SA  
  一、实现方法 2eR+dT  
sQw`U{JG  
  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: G>ptwB81KM  
^B!?;\4IM  
#pragma data_seg("shareddata") C8W`Oly:]  
HHOOK hHook =NULL; //钩子句柄 |Q)w3\S$  
UINT nHookCount =0; //挂接的程序数目 t-4 R7`A<  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 JJHvj=9'o  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 %Rsf6rJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey cJWfLD>2_!  
static int KeyCount =0; .iN*V|n  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 J_[[BJ&}x  
#pragma data_seg() nM.?Q}yO~  
Nj-rZ%&  
  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。 c.{&~  
Nb!6YY=Ez-  
  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: ;7n*PBUJJ  
|o=\9:wV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR !>2\OSp!  
cKey,UCHAR cMask) L,A-G"z0Z  
{ pOI`,i}.  
 BOOL bAdded=FALSE; 6p=xgk-q  
 for(int index=0;index<MAX_KEY;index++){ !4,xQ ^   
  if(hCallWnd[index]==0){ y" 6~9j  
   hCallWnd[index]=hWnd; ;1g-z]  
   HotKey[index]=cKey; U:4Og8  
   HotKeyMask[index]=cMask; AUjTcu>i  
   bAdded=TRUE; T!xy^n]}  
   KeyCount++; 3&nc'  
   break; P"_}F  
  } L%O8vn^3  
 } ?M-8Fp3 +  
 return bAdded; ^\kHEM|5v  
} >.wd)  
//删除热键 #M^Yh?~%w  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) IZv, Wo  
{ s>``- ]3  
 BOOL bRemoved=FALSE; = 4WZr  
 for(int index=0;index<MAX_KEY;index++){ 2d;xAX]  
  if(hCallWnd[index]==hWnd){ Cbg#Yz~/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ B{UoNm@  
    hCallWnd[index]=NULL; sAN:C{  
    HotKey[index]=0; F4<2.V)#-  
    HotKeyMask[index]=0; G1^!ej  
    bRemoved=TRUE; %PdYv _5  
    KeyCount--; MVv^KezD  
    break; /^eemx  
   } 8Pdnw/W  
  } rHBjR_L.2  
 } VrE5^\k<a  
 return bRemoved; 1LIV/l^}f  
} ftH%, /,  
TIh zMW\/K  
_%Ld E z  
  DLL中的钩子函数如下: J9=0?^v-:B  
;,-Vapz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Ahbu >LPk  
{ X|1YGZJ  
 BOOL bProcessed=FALSE; Ry S{@=si  
 if(HC_ACTION==nCode) @d^h/w  
 { GXlg%  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 MV d 3*  
   switch(wParam) :@Dos'0Px  
   {  pvUoed\  
    case VK_MENU: :Sn3|`HDm  
     MaskBits&=~ALTBIT; FY S83uq0  
     break; [=F |^KL  
    case VK_CONTROL: Jo$Dxa z  
     MaskBits&=~CTRLBIT; 6SO7iFS  
     break; 6%INNIyAWa  
    case VK_SHIFT: }Q^a.`h  
     MaskBits&=~SHIFTBIT; +mOtYf W  
     break; [IBk-opap  
    default: //judge the key and send message @CI6$  
     break; GiwA$^Hg\  
   } _1c_TMh}9  
   for(int index=0;index<MAX_KEY;index++){ Rs[]i;  
    if(hCallWnd[index]==NULL) . \0=1P:  
     continue; E(LE*J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Vot+gCZ  
    { %ys}Q!gR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); kD7(}N8YR  
     bProcessed=TRUE; ld?.o/  
    } Z|S7 " ,  
   } 32P]0&_O  
  } gK\7^95  
  else if((lParam&0xc000ffff)==1){ //有键按下 ZKPkx~,U[  
   switch(wParam) ~RAH -]  
   { 2I 7`  
    case VK_MENU: r+p jv_R  
     MaskBits|=ALTBIT; NT/B4'_@  
     break; swL|Ff`$  
    case VK_CONTROL: k\%v;3nBK  
     MaskBits|=CTRLBIT; xF|*N<9(</  
     break; .LR>&N_U  
    case VK_SHIFT: I'b]s~u  
     MaskBits|=SHIFTBIT; ymX,k|lh  
     break; B&N&eRAE  
    default: //judge the key and send message Z`c{LYP,y"  
     break; v nC&1  
   } -Ep6 .v  
   for(int index=0;index<MAX_KEY;index++){ aW$nNUVD  
    if(hCallWnd[index]==NULL) }3y\cv0ct  
     continue; 4yv31QG$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RcP5].^T  
    { q#3X*!)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Vdk+1AX  
     bProcessed=TRUE; j1+Y=@MA  
    } zL8A?G)= M  
   } @2*6+w_Ae  
  } tgA |Vwwk  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Pp hQa!F$  
   for(int index=0;index<MAX_KEY;index++){ gjLgeyyWC  
    if(hCallWnd[index]==NULL) XO~^*[K  
     continue; "]Td^Nxi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) H H3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >{Z=cv/6o  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ZhaOH5{9  
   } j!7Uj]  
  } ;}'<`(f&nX  
 } -V<"Ay  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); j)qh>y)  
} {U-EBXV  
Mu%,@?zM^/  
  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: Fsj[JE  
*G41%uz  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rapca'&#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Uk\U*\.  
cSk}53  
  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: ", )  
{?hjx+v[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :XZ pnjj  
{ :zRboqe(cc  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) hz<J8'U  
 { oH"N>@Vl  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 0+pJv0u  
  SaveBmp(); ^T,cXpx|  
  return FALSE; BG=_i#V  
 } *$D-6}Oay  
 …… //其它处理及默认处理 Ngnjr7Q={T  
} &}1)]6q$  
,$-PC=Ti(  
L9oZ7o  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 H]X)@n>  
EPy/6-5b  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 hGV/P94  
?9TogW>W  
  二、编程步骤 `oBzt |f5  
{hz :[  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; o7zfD94I  
K^ \9R  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; qr6jn14.c  
pASVnXJZ  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; n\Ixv  
"QS7?=>*F  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ||aU>Wj4  
`0:@`)&g1  
  5、 添加代码,编译运行程序。 9lV'3UG-?  
'%N)(S`O7P  
三、程序代码 KL4/"$l]  
_@2G]JD  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL e IA=?k.y  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) yk2j&}M  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 9<S-b |!@  
#if _MSC_VER > 1000 D9 en  
#pragma once mM.&c5U  
#endif // _MSC_VER > 1000 9G~P)Z!0  
#ifndef __AFXWIN_H__ PK" C+o;:  
#error include 'stdafx.h' before including this file for PCH 'zK*?= ^jk  
#endif q =6 Y2Q  
#include "resource.h" // main symbols 7i.aZ2a%  
class CHookApp : public CWinApp @jKB!z9{  
{ (.o'1 '  
 public: ?f..N,s  
  CHookApp(); Kq$1lPI  
  // Overrides %R"Fx$tQ  
  // ClassWizard generated virtual function overrides {wI0 =U  
  //{{AFX_VIRTUAL(CHookApp) HrGX-6`  
 public: =Frr#t!(w0  
  virtual BOOL InitInstance(); X)m2{@v D  
  virtual int ExitInstance(); {'!~j!1'j  
  //}}AFX_VIRTUAL g\'sGt3O  
  //{{AFX_MSG(CHookApp) 2|BE{91  
  // NOTE - the ClassWizard will add and remove member functions here. F1>,^qyG6  
  // DO NOT EDIT what you see in these blocks of generated code ! ^ a:F*<D  
  //}}AFX_MSG kx[8#+P  
  DECLARE_MESSAGE_MAP() rej[G!  
}; t ,$)PV  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); #SueT"F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); WM26-nR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1~ Nz6  
BOOL InitHotkey(); ~\P.gSiz  
BOOL UnInit(); ^iNR(cwgX  
#endif uk,f}Xc  
{ SV$fl;  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. -eTGRr  
#include "stdafx.h" rtm28|0H'  
#include "hook.h" t At+5H  
#include <windowsx.h> kWFR(J&R  
#ifdef _DEBUG )Pq.kn{Sp  
#define new DEBUG_NEW K4BMa]/U  
#undef THIS_FILE X*KT=q^?n  
static char THIS_FILE[] = __FILE__; |4vk@0L  
#endif P; Ox|  
#define MAX_KEY 100 ]7;;uhn`  
#define CTRLBIT 0x04 ']Z8C)tK  
#define ALTBIT 0x02 G1rgp>m  
#define SHIFTBIT 0x01 dkjL;1  
#pragma data_seg("shareddata") Jp- hFD  
HHOOK hHook =NULL; }R^{<{KVJ  
UINT nHookCount =0; {`VQL6(i  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey h.nzkp5  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT /NZ R|  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey I8y\D,  
static int KeyCount =0; bPNsy@"6  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift a'BBp6  
#pragma data_seg() O);V{1P  
HINSTANCE hins; i&Ea@b  
void VerifyWindow(); eo!z>9#.  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) NQmDm!-4  
//{{AFX_MSG_MAP(CHookApp) zx27aZ[  
// NOTE - the ClassWizard will add and remove mapping macros here. 3?:}lY<,  
// DO NOT EDIT what you see in these blocks of generated code! A Ho<E"R\  
//}}AFX_MSG_MAP <$E8T>U  
END_MESSAGE_MAP() M5]w U   
R-ci?7dt3  
CHookApp::CHookApp() /-T%yuU  
{ R##O9BSI8Z  
 // TODO: add construction code here, y03l_E,  
 // Place all significant initialization in InitInstance HM/ q B^  
} 7DD ot_qb  
kDsUKO p  
CHookApp theApp; #]rw@c  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) i> ;G4  
{ 9 wc=B(a|  
 BOOL bProcessed=FALSE; %llG/]q#  
 if(HC_ACTION==nCode) l<5!R;?$  
 { j2+&B9 (  
  if((lParam&0xc0000000)==0xc0000000){// Key up Z\x6  
   switch(wParam) 3jeR;N]x  
   { xfb%bkr  
    case VK_MENU: J#\/znT  
     MaskBits&=~ALTBIT; ?G@%haqn6  
     break; ;Bm{_$hf=  
    case VK_CONTROL: IcB>Hg5  
     MaskBits&=~CTRLBIT; ,Fb#%r%  
     break; R0Qp*&AL  
    case VK_SHIFT: 0/c4%+ Ln  
     MaskBits&=~SHIFTBIT; !|D,cs  
     break;  u!(|y9p  
    default: //judge the key and send message ~34$D],D  
     break; QeGU]WU{  
   } 1z)+P1nH]  
   for(int index=0;index<MAX_KEY;index++){ {z w#My   
    if(hCallWnd[index]==NULL) gCmGFQE-f  
     continue; Y#\e~>K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bbz86]AhY  
    { #C|iW@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); p?Y1^/   
     bProcessed=TRUE; 3'8~H]<W  
    } 1!~9%=%  
   } |nD`0Rbw  
  } r_)*/  
  else if((lParam&0xc000ffff)==1){ //Key down }G]]0Oi2  
   switch(wParam) BP`UB  
   { yY}`G-)g~*  
    case VK_MENU: 1UOFTI2S|  
     MaskBits|=ALTBIT; Gb"PMai  
     break; U9Sp$$L  
    case VK_CONTROL: dG1qrh9_-  
     MaskBits|=CTRLBIT; Rc u/ @j{O  
     break; T+I|2HYqOj  
    case VK_SHIFT: N7|ctO  
     MaskBits|=SHIFTBIT; 6uDNqq  
     break; NS\'o )J  
    default: //judge the key and send message kM.zX|_  
     break; !+i  
   } {9(N?\S1`a  
   for(int index=0;index<MAX_KEY;index++) o^Ms(?K%t  
   { E5B:79BGO  
    if(hCallWnd[index]==NULL) W)KV"A3C  
     continue; 8$1<N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]1X];x&e  
    { wuPx6hCl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \5Hfe;ny-~  
     bProcessed=TRUE; %#= 1?1s  
    } nfc&.(6x<  
   } Rt+s\MC^r  
  } <=WQs2  
  if(!bProcessed){ )AnX[:y  
   for(int index=0;index<MAX_KEY;index++){ ZZ.GpB.  
    if(hCallWnd[index]==NULL) %0L 9)-R  
     continue;  $///N+B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) f)>=.sp  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); }z}oVc  
   } W}Z'zU?[  
  }  0N md*r  
 } f"z96{zo  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @X|CubJ  
} 5@?P 8  
%|UCs8EFm  
BOOL InitHotkey() leiP/D6s  
{ < }G7#xg  
 if(hHook!=NULL){ `w2hJP  
  nHookCount++; ZZ#S\*  
  return TRUE; g^=p)h3  
 } [^#6.xH  
 else  IS!sJc  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); $P>ci4]t  
  if(hHook!=NULL) 23zB@aE_?1  
   nHookCount++; k<m{Wp;-  
  return (hHook!=NULL); @`)A )  
} gE|_hfm(  
BOOL UnInit()  kf';"  
{ oGa8}Vtc  
 if(nHookCount>1){ 8@Pv nOL  
  nHookCount--; "+p_{J/P  
  return TRUE; 2-FL&DE  
 } ;:f.a(~c  
 BOOL unhooked = UnhookWindowsHookEx(hHook); t=5 K#SX}  
 if(unhooked==TRUE){ 7&E3d P  
  nHookCount=0; Ao(Xz$cQfW  
  hHook=NULL; YHl6M&*@  
 } IF<pT)  
 return unhooked; awGI|d  
} (z\@T`6`  
tQF,E&Jo8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }PD? x4  
{ 8ex{N3  
 BOOL bAdded=FALSE; Hr:WE+'  
 for(int index=0;index<MAX_KEY;index++){ K%O%#Kk  
  if(hCallWnd[index]==0){ A?=g!(wB  
   hCallWnd[index]=hWnd; Ng2qu!F7  
   HotKey[index]=cKey; e+j7dmGa  
   HotKeyMask[index]=cMask; .hXxh)F  
   bAdded=TRUE; Q YPsqkF*  
   KeyCount++; Ap=L lZ  
   break; uD_iyK0,  
  } UO>ADRs}  
 } m!V ?xGKJ  
 return bAdded; d[J+):aW  
} xh,};TS(K  
> T=($:n  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) vdV@G`)HPr  
{ Z  G3u  
 BOOL bRemoved=FALSE; ihdN{Mx<2  
 for(int index=0;index<MAX_KEY;index++){ Y:XE4v/)@L  
  if(hCallWnd[index]==hWnd){ /0IvvD!7N  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ HTA Jn_  
    hCallWnd[index]=NULL; e<#t]V  
    HotKey[index]=0; 9 "7(Jq  
    HotKeyMask[index]=0; `{#0C-  
    bRemoved=TRUE; $C#G8Ck,  
    KeyCount--; vvwNJyU-  
    break; )%I2#Q"Nt-  
   } [LbUlNq^B@  
  } |wZcVct~  
 } Z_Qs^e$  
 return bRemoved; FWNWOU  
} 07`hQn)Gc  
&Ba` 3V\M  
void VerifyWindow() $hXhq*5|c  
{ PRg^E4  
 for(int i=0;i<MAX_KEY;i++){ &'Pwz  
  if(hCallWnd!=NULL){ 2r4owB?  
   if(!IsWindow(hCallWnd)){ h\k@7wgu  
    hCallWnd=NULL; c 2t<WRG  
    HotKey=0; @9Rg g9r  
    HotKeyMask=0; R7pdwKD  
    KeyCount--; `fYICp  
   } -{n2^vvF  
  } ge %ytrst  
 } /}t>o* x  
} (e.?). e  
&@NTedg!  
BOOL CHookApp::InitInstance() aNs~Uad1U  
{ }8`W%_Yk  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); "^Y)&<J&  
 hins=AfxGetInstanceHandle(); {}RE;5n\['  
 InitHotkey(); GG<{n$h  
 return CWinApp::InitInstance(); bis}zv^%v  
} {xJq F4  
5n{J}0C  
int CHookApp::ExitInstance() Z\c^CN  
{ _$g6Mj]1z  
 VerifyWindow(); iZm# "}VG  
 UnInit(); RvrZtg5  
 return CWinApp::ExitInstance(); HtY0=r  
} )lh48Ag0t;  
iYJ:P  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file <?yf<G'$  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) dp;;20z  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ IsP-[0it  
#if _MSC_VER > 1000 J8IdQ:4^l  
#pragma once P5-1z&9O  
#endif // _MSC_VER > 1000 0se0AcrW  
x \0( l5>  
class CCaptureDlg : public CDialog {EU?{ #  
{ ~xfoZiIA}  
 // Construction B6 rz  
 public: "u^%~2  
  BOOL bTray; f"i(+:la  
  BOOL bRegistered; (OS -v~{r@  
  BOOL RegisterHotkey(); /6S% h-#\  
  UCHAR cKey; i;Y3pF0%P  
  UCHAR cMask; tf<}%4G  
  void DeleteIcon(); #x|xL7  
  void AddIcon(); / ,Unp1D  
  UINT nCount; Y%$@ZYW  
  void SaveBmp(); GY% ^!r  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor v|~&I%S7  
  // Dialog Data [&H$Su}$0  
  //{{AFX_DATA(CCaptureDlg) ^hL?.xj  
  enum { IDD = IDD_CAPTURE_DIALOG }; Z8mSm[w  
  CComboBox m_Key; DNTkv_S  
  BOOL m_bControl; pAK7V;sJ  
  BOOL m_bAlt; *S _[8L"  
  BOOL m_bShift; }MU}-6  
  CString m_Path; B:5NIa  
  CString m_Number; QEtf-xNn^  
  //}}AFX_DATA \<n 9kwU  
  // ClassWizard generated virtual function overrides d}B_ wz'  
  //{{AFX_VIRTUAL(CCaptureDlg) B"; >zF  
 public: '?$N.lj$d  
  virtual BOOL PreTranslateMessage(MSG* pMsg); /w[B,_ZKTk  
 protected: o}^/K m+t  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @bfW-\ I  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Jr2x`^aNO  
  //}}AFX_VIRTUAL (_2Iu%F  
  // Implementation +`jI z'+  
 protected: ahJ -T@  
  HICON m_hIcon; ^v2-"mX<  
  // Generated message map functions AlPk o($E*  
  //{{AFX_MSG(CCaptureDlg) y&A0}>a:d  
  virtual BOOL OnInitDialog(); oY NIJXln  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }253Q!f  
  afx_msg void OnPaint(); xvpCOoGsz  
  afx_msg HCURSOR OnQueryDragIcon(); [-Xz:  
  virtual void OnCancel(); _Fc :<Ym?  
  afx_msg void OnAbout(); =@ SJyW  
  afx_msg void OnBrowse(); 8)KA {gN}  
  afx_msg void OnChange(); BIJlU(aF  
 //}}AFX_MSG 3$ 'eDa[  
 DECLARE_MESSAGE_MAP() g#W/WKvM  
}; XEX ."y  
#endif (v/mKGyg  
&Hl*Eg f  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file yW@0Q:  
#include "stdafx.h" N*mm[F2+F  
#include "Capture.h" O4c[,Uq8~  
#include "CaptureDlg.h" 85{2TXQ^%=  
#include <windowsx.h> Nd;)V  
#pragma comment(lib,"hook.lib") lhk=yVG3  
#ifdef _DEBUG 8?yRa{'"  
#define new DEBUG_NEW WSi`KNX  
#undef THIS_FILE :NCY6? [Dz  
static char THIS_FILE[] = __FILE__; ?v5OUmFM  
#endif OCX>LK!K  
#define IDM_SHELL WM_USER+1 J`I^F:y*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !Py SYY  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bY@ S[  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ;~^9$Z@%Q  
class CAboutDlg : public CDialog BI|BfO%F$j  
{ 1K&_t  
 public: N'5AU (  
  CAboutDlg(); @gc|Z]CV  
  // Dialog Data G d%X> ~  
  //{{AFX_DATA(CAboutDlg) :Qc[>:N  
  enum { IDD = IDD_ABOUTBOX }; @3aI7U/I  
  //}}AFX_DATA NP+*L|-;  
  // ClassWizard generated virtual function overrides C<G`wXlP|  
  //{{AFX_VIRTUAL(CAboutDlg) M= ]]kJ:I  
 protected: M "W~%   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support LK>J]p  
  //}}AFX_VIRTUAL u*h+ c8|zI  
  // Implementation {e/6iSpT  
 protected: U=Hx&g  
  //{{AFX_MSG(CAboutDlg) Hyn*O)q!  
  //}}AFX_MSG K|a^<| S  
  DECLARE_MESSAGE_MAP() ;:`0:Ao.  
}; X:/Y^Xu  
6he (v  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) G+k~k/D6  
{ 1s"/R  
 //{{AFX_DATA_INIT(CAboutDlg) R3dt-v  
 //}}AFX_DATA_INIT asj*/eC$/i  
} >}I BPC  
Ho^rYz  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 2a,l;o$2&  
{ USDqh437  
 CDialog::DoDataExchange(pDX); mh$Nwr/W:  
 //{{AFX_DATA_MAP(CAboutDlg) `@tn Eg  
 //}}AFX_DATA_MAP 3;E,B7,mQ  
} fGf C[DuY  
8am/5o  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) =rL^^MZp  
 //{{AFX_MSG_MAP(CAboutDlg) ^#0k\f>_  
 // No message handlers P;8D|u^\*  
 //}}AFX_MSG_MAP Shag4-*@hi  
END_MESSAGE_MAP() BKJwM'~  
J]"IT*-Ht  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %~{G*%:  
: CDialog(CCaptureDlg::IDD, pParent) Jx-dWfe  
{ ", Ge:\TR=  
 //{{AFX_DATA_INIT(CCaptureDlg) uG:xd0X+W  
  m_bControl = FALSE; 4Y x\U  
  m_bAlt = FALSE; $%GW~|S\C  
  m_bShift = FALSE; G&DL)ePu]m  
  m_Path = _T("c:\\"); wF\5 X  
  m_Number = _T("0 picture captured."); q\I2lZ  
  nCount=0; 9FKowF_8  
  bRegistered=FALSE; PKK18E}{%^  
  bTray=FALSE; %=G*{mK  
 //}}AFX_DATA_INIT qiyX{J7Z  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 OtsW>L@ O(  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); "'9[c"Iz  
} dU<qFxW  
+`p@md2L1  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) rL9u7) x  
{ s.{nxk.  
 CDialog::DoDataExchange(pDX); 2$@N4  
 //{{AFX_DATA_MAP(CCaptureDlg) H6Dw5vG"l  
  DDX_Control(pDX, IDC_KEY, m_Key); 9~lC/I')t  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 2sXNVo8`w"  
  DDX_Check(pDX, IDC_ALT, m_bAlt); >vny9^_  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); v "Yo  
  DDX_Text(pDX, IDC_PATH, m_Path); -0G/a&ss  
  DDX_Text(pDX, IDC_NUMBER, m_Number); $ KAOJc4<  
 //}}AFX_DATA_MAP 0^G5 zQlj  
} xkPH_+4i8  
K:_5#!*^98  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) #y2IHO-  
//{{AFX_MSG_MAP(CCaptureDlg) ]A]EED.ZH  
 ON_WM_SYSCOMMAND() g/_j"Nn  
 ON_WM_PAINT() ^:Hx.  
 ON_WM_QUERYDRAGICON() gq`S`  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) kaUEv\T   
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &40# _>W7  
 ON_BN_CLICKED(ID_CHANGE, OnChange) %@Ow.7zh  
//}}AFX_MSG_MAP +T,Yf/^Fn  
END_MESSAGE_MAP() .kT}E5  
n72+X  
BOOL CCaptureDlg::OnInitDialog() x./l27}6  
{ `(Eiu$h6V-  
 CDialog::OnInitDialog(); !$1'q~sO  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ?ZS/`P0}[  
 ASSERT(IDM_ABOUTBOX < 0xF000); ]Lz:oV^%  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 6.(L8.jv  
 if (pSysMenu != NULL) 4IUdlb  
 { Jp#Onl+d6  
  CString strAboutMenu; m&&Y=2  
  strAboutMenu.LoadString(IDS_ABOUTBOX); =IC cN|  
  if (!strAboutMenu.IsEmpty()) R/BW$4/E  
  { J.;{`U=:  
   pSysMenu->AppendMenu(MF_SEPARATOR); xJemc3]2  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;+6TZqklQ  
  } "IE*MmsEz  
 } xoQ;fVNp  
 SetIcon(m_hIcon, TRUE); // Set big icon KO''B or  
 SetIcon(m_hIcon, FALSE); // Set small icon a|u&N:v7B  
 m_Key.SetCurSel(0); -rXo}I,VI  
 RegisterHotkey(); A6faRi703  
 CMenu* pMenu=GetSystemMenu(FALSE); :rcohzfa  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); <Z:Fnp  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )u67=0s2i+  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); $(A LxC  
 return TRUE; // return TRUE unless you set the focus to a control mQiVTIP3[O  
} ]?"1FSu-8r  
+.Cx.Nf(  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) >v9@p7Dn  
{ 6U!zc]>  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^U@-Dp,k+  
 { Mb +  
  CAboutDlg dlgAbout; }]K^b1Fs5  
  dlgAbout.DoModal(); 3Y6W)$ Q  
 } +61h!/<W  
 else x4 .Y&Wq#  
 { G0^,@jF?b  
  CDialog::OnSysCommand(nID, lParam); nbf w7u  
 } h F4gz*Q  
} E2%{?o  
27CVAX ghV  
void CCaptureDlg::OnPaint() 898=9`7e  
{ _ W +  
 if (IsIconic()) 5<=ktA48[  
 { W%,h{  
  CPaintDC dc(this); // device context for painting FsTl@zN  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 1nAAs;`'  
  // Center icon in client rectangle 23_\UTM}1  
  int cxIcon = GetSystemMetrics(SM_CXICON); Dc;zgLLL  
  int cyIcon = GetSystemMetrics(SM_CYICON); 7 8n`VmH~L  
  CRect rect; l<"Z?z  
  GetClientRect(&rect); ~IIlCmMl,  
  int x = (rect.Width() - cxIcon + 1) / 2; r{1xjAT  
  int y = (rect.Height() - cyIcon + 1) / 2; Sb,lY<=  
  // Draw the icon b xFDB^  
  dc.DrawIcon(x, y, m_hIcon); 2J0N]`|)  
 } *$/!.e  
 else iM'rl0  
 { z($h7TZ$  
  CDialog::OnPaint(); eJ2$DgB}t  
 } Pko2fJt1  
} J*}Qnl+  
xTV3U9 v  
HCURSOR CCaptureDlg::OnQueryDragIcon() F4$N:J kl  
{ s;NPY  
 return (HCURSOR) m_hIcon; XkE'k;AEx  
} Z.x9SEe1t  
@Z{!T)#}j  
void CCaptureDlg::OnCancel() o%1dbbh  
{ q(iM=IeiN  
 if(bTray) =xX)2h  
  DeleteIcon(); n)6mfoe  
  CDialog::OnCancel(); W^sH|2g  
} ZlEH3-Zv  
Z<M?_<3  
void CCaptureDlg::OnAbout() lemE/(`a_  
{ KBSO^<7  
 CAboutDlg dlg; SIr^\iiOB  
 dlg.DoModal(); Th%2pwvER  
} 2C@s-`b   
kntM  
void CCaptureDlg::OnBrowse() ~4{|  
{ {L9WeosQ  
 CString str; EKTn$k=  
 BROWSEINFO bi; z:a%kZQ!0  
 char name[MAX_PATH]; XZ1oV?Z4  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); W:V:Ej7 h  
 bi.hwndOwner=GetSafeHwnd(); aW.[3M;?v  
 bi.pszDisplayName=name; r)Dln5F  
 bi.lpszTitle="Select folder"; ImZ!8#  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )e6)~3[^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); fH6mv0  
 if(idl==NULL) WY3D.z-</  
  return; yWkg4  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); mO|YX/>  
 str.ReleaseBuffer(); p%?m|(4f  
 m_Path=str; OqNtTk+  
 if(str.GetAt(str.GetLength()-1)!='\\') 0g&#hW};[6  
  m_Path+="\\"; 64jFbbd-/  
 UpdateData(FALSE); B!X;T9^d  
} p.50BcDg  
2zQ62t}  
void CCaptureDlg::SaveBmp() V\4zK$]  
{ ` 0}z ;&:  
 CDC dc; }_vUsjK  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;{%R'  
 CBitmap bm; ^_C]?D?  
 int Width=GetSystemMetrics(SM_CXSCREEN); r'5~4'o$  
 int Height=GetSystemMetrics(SM_CYSCREEN); ,y%4QvG7a  
 bm.CreateCompatibleBitmap(&dc,Width,Height); :K]&rGi,  
 CDC tdc; <{xU.zp'  
 tdc.CreateCompatibleDC(&dc); zFpM\{`[g  
 CBitmap*pOld=tdc.SelectObject(&bm); -YD+x PD  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); b?Zt3#  
 tdc.SelectObject(pOld); M,V~oc5  
 BITMAP btm; 5S&'O4yz^  
 bm.GetBitmap(&btm); 7%g8&d  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; B>=NE.ulUL  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ~E J+<[/  
 BITMAPINFOHEADER bih; We51s^(  
 bih.biBitCount=btm.bmBitsPixel; $wq[W,'#L  
 bih.biClrImportant=0; Q#a<T4l  
 bih.biClrUsed=0; :l/?cV;  
 bih.biCompression=0; g(`m#&P>G  
 bih.biHeight=btm.bmHeight; LLlt9(^d  
 bih.biPlanes=1; }>T$2"pf  
 bih.biSize=sizeof(BITMAPINFOHEADER); R_ |Sg  
 bih.biSizeImage=size; ~0 5p+F)  
 bih.biWidth=btm.bmWidth; r iuG,$EX  
 bih.biXPelsPerMeter=0; Utv#E.VI  
 bih.biYPelsPerMeter=0; [>^xMF]$2  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); %n7Y5|Uh  
 static int filecount=0; 3LK]VuZE  
 CString name; ^xZo .P  
 name.Format("pict%04d.bmp",filecount++); y8k*{1MuO  
 name=m_Path+name; rr;p;  
 BITMAPFILEHEADER bfh; VGDds  
 bfh.bfReserved1=bfh.bfReserved2=0; R<-u`uX nP  
 bfh.bfType=((WORD)('M'<< 8)|'B'); gp`H>Sn.|  
 bfh.bfSize=54+size; AXmW7/Sj"  
 bfh.bfOffBits=54; @s[Vtw%f  
 CFile bf; #Y9'n0 AL  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ qT}AY.O%^  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); g82_KUkB  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); CR KuN  
  bf.WriteHuge(lpData,size); KOqp@K$  
  bf.Close(); W:z?w2{VI(  
  nCount++; `5$B"p&i  
 } *RpBKm&^7  
 GlobalFreePtr(lpData); |1z?#@BH  
 if(nCount==1) eq<giHJM  
  m_Number.Format("%d picture captured.",nCount); PRo;NE  
 else Uw:gJ 9  
  m_Number.Format("%d pictures captured.",nCount); nS`DI92I  
  UpdateData(FALSE); N=hhuKt]  
} n@ rphJb  
oI/jGyY;  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \8 ~`NF  
{ ;uK">L[u'  
 if(pMsg -> message == WM_KEYDOWN) nGvWlx  
 { ^.]]0Rp&  
  if(pMsg -> wParam == VK_ESCAPE) Fy!-1N9|l  
   return TRUE; gXzp$#  
  if(pMsg -> wParam == VK_RETURN) aLKvl~s;m  
   return TRUE; GLIe8T*ht  
 } N9s ,..  
 return CDialog::PreTranslateMessage(pMsg); H|]~(.w 1}  
} vI)-Zz[3  
J#L"kz  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M1sR+e$"  
{ K$K6,54y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ &1k2J   
  SaveBmp(); Pn;Tg7oz  
  return FALSE; R,'` A.Kk  
} GNIZHyT(O  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ vXA+4 ?ZG  
 CMenu pop; >^!qx b-  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); x<-n}VK\  
 CMenu*pMenu=pop.GetSubMenu(0); equTKM  
 pMenu->SetDefaultItem(ID_EXITICON); 8T2iqqG/1  
 CPoint pt; kS@6'5U  
 GetCursorPos(&pt); pMfP3G7V  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); B > sTM  
 if(id==ID_EXITICON) 7j <:hF~  
  DeleteIcon(); k;AV  'r  
 else if(id==ID_EXIT) v]tNJ=aI  
  OnCancel(); !VF.=\iH/  
 return FALSE; Le*sLuxk<  
} HS% P  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); w&F/P]1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |D ?}6z  
 AddIcon(); lN<,<'&^.  
 return res; VXpbmg!{S  
} P%-@AmO^_  
fT&>L  
void CCaptureDlg::AddIcon() RkW)B^#  
{ %#^)hX,+Q  
 NOTIFYICONDATA data; Z6Owxqfht  
 data.cbSize=sizeof(NOTIFYICONDATA); K:i{us`  
 CString tip; mROXwzL  
 tip.LoadString(IDS_ICONTIP); ?uq7K"B  
 data.hIcon=GetIcon(0); s?j` _ B  
 data.hWnd=GetSafeHwnd(); C6-71 `C0  
 strcpy(data.szTip,tip); z 5T_  
 data.uCallbackMessage=IDM_SHELL; ~qk5Mk4$  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~sd+ch*  
 data.uID=98; D8b~-#  
 Shell_NotifyIcon(NIM_ADD,&data); +Je(]b @  
 ShowWindow(SW_HIDE); &;D(VdSr9  
 bTray=TRUE; @n-[bN  
} ]nEZ Q+F  
?\eq!bu  
void CCaptureDlg::DeleteIcon() v@8 =u4  
{ n<. T6  
 NOTIFYICONDATA data; Ckelr  
 data.cbSize=sizeof(NOTIFYICONDATA); 7i,Z c]  
 data.hWnd=GetSafeHwnd(); kCq]#e~wq  
 data.uID=98; &vy/Vd  
 Shell_NotifyIcon(NIM_DELETE,&data); ) Apg  
 ShowWindow(SW_SHOW); 8\85Wk{b  
 SetForegroundWindow(); 0^27grU>   
 ShowWindow(SW_SHOWNORMAL); ^YpA@`n  
 bTray=FALSE; bg8<}~zg  
} `?X=@  
)AX0x1I|E  
void CCaptureDlg::OnChange() H| uvcvf  
{ -RSPYQjz  
 RegisterHotkey(); ]lKQ wpX3  
} *TjolE~o  
-\.'WZo`  
BOOL CCaptureDlg::RegisterHotkey() A=v^`a03I  
{ 5g{L -8XwI  
 UpdateData(); `3v! i   
 UCHAR mask=0; I^5T9}>Q  
 UCHAR key=0; ]G0`W6;$]  
 if(m_bControl) 1>doa1  
  mask|=4; x}w"2[fL  
 if(m_bAlt) (Oc[j{6q  
  mask|=2; R"au8f.  
 if(m_bShift) 2hjR'6h"Y  
  mask|=1; 1D,$Az~.  
  key=Key_Table[m_Key.GetCurSel()]; A1zqm_X5)P  
 if(bRegistered){ HlkG^:)  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 2^Tj@P7  
  bRegistered=FALSE; T@n-^B!Xq  
 } Zl0Kv *S  
 cMask=mask; nbnbG0r:  
 cKey=key; o4)^U t+  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); wW7W+,{o  
 return bRegistered; $uA?c& e  
} )-_NtMr~`!  
:y?xS  
  四、小结 _L6WbRu|  
MNE{mV(  
  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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