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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: (Xh <F  
  $^ee~v;m4  
  一、实现方法 WiS3W;  
pj$JA  
  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: qk2E>  
<+oh\y16  
#pragma data_seg("shareddata") \9)5b8  
HHOOK hHook =NULL; //钩子句柄 Hd|[>4Z  
UINT nHookCount =0; //挂接的程序数目 kGYpJg9=  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 0Z1ksfLU  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1  ES~b f  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey r exv)!J  
static int KeyCount =0; d_yvG.#C  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 5H0qMt P  
#pragma data_seg() @:C)^f"  
:> 0ywg  
  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。 pAE (i7  
yV(#z2|  
  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: ]F4QZV( M  
,|:.0g[n  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR gwoe1:F:J  
cKey,UCHAR cMask) *#T: _  
{ S hI1f  
 BOOL bAdded=FALSE; HAxLYun(3w  
 for(int index=0;index<MAX_KEY;index++){ mr\,"S-`  
  if(hCallWnd[index]==0){ (p-q>@m  
   hCallWnd[index]=hWnd; Kjd3!%4mB  
   HotKey[index]=cKey; 0)oh ab  
   HotKeyMask[index]=cMask; :y-;V  
   bAdded=TRUE; .<%tu 0  
   KeyCount++; z1J)./BO  
   break; >1j#XA8  
  } q]? qeF[  
 } 9zwD%3Ufn  
 return bAdded; 4X+xh|R:U  
} TEz;:*,CG  
//删除热键 n/_q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I%YwG3uR  
{ 3K &637  
 BOOL bRemoved=FALSE; W{F)YyR{.  
 for(int index=0;index<MAX_KEY;index++){ z9aR/:W}  
  if(hCallWnd[index]==hWnd){ >dl5^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4YfM.~ 6  
    hCallWnd[index]=NULL; |OH*c3~r  
    HotKey[index]=0; r mX*s} B  
    HotKeyMask[index]=0; Hd~g\  
    bRemoved=TRUE; /mkT7,]  
    KeyCount--; Y) sB]!hx  
    break; )p\`H;7*V4  
   } OcT Wq  
  } YEu+kBlcQ  
 } os/h~,=  
 return bRemoved; U@OdQAX  
} QLY;@-jF$  
Msqqjhoy  
9\Jc7[b  
  DLL中的钩子函数如下: ]-\68bN  
4z<c8 E8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) yB UQ!4e  
{ m!FuC=e  
 BOOL bProcessed=FALSE; RE>Q5#|c  
 if(HC_ACTION==nCode) !85bpQ.  
 { b Hr^_ogN  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 IuXgxR%  
   switch(wParam) cp`J ep<T  
   {  $${I[2 R)  
    case VK_MENU: Z@zo~*o  
     MaskBits&=~ALTBIT; v"k ? e  
     break; 2;v:Z^&  
    case VK_CONTROL: xX<f4H\'  
     MaskBits&=~CTRLBIT; "\o#YC  
     break; .LDZqWr-  
    case VK_SHIFT: fd'kv  
     MaskBits&=~SHIFTBIT; <2pp6je\0s  
     break; a|t~&\@  
    default: //judge the key and send message  /a1uG]Mt  
     break; w%])  
   } (<Cq_K w  
   for(int index=0;index<MAX_KEY;index++){ NXOXN]=c<  
    if(hCallWnd[index]==NULL) %~Yo{4mHs  
     continue; ;Nn(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v9f+ {Y%-  
    { )L b` 4B  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); dmF=8nff  
     bProcessed=TRUE; k4q":}M  
    } @[r[l#4yUi  
   } \!^=~` X-  
  } f;'*((  
  else if((lParam&0xc000ffff)==1){ //有键按下 *u+DAg'&  
   switch(wParam) Bp^LLH  
   { _lv{8vf1B  
    case VK_MENU: vMz|'-rm$  
     MaskBits|=ALTBIT; ZXnacc~s  
     break; u "0{) ,  
    case VK_CONTROL: cEL:5*cAU}  
     MaskBits|=CTRLBIT; ?}?"m:=  
     break; ]9YA~n\  
    case VK_SHIFT: u> {aF{  
     MaskBits|=SHIFTBIT; 'yiv.<4  
     break; vkG#G]Qs";  
    default: //judge the key and send message E)*ht;u  
     break; 9lq5\ tL-  
   } .YF1H<gwa  
   for(int index=0;index<MAX_KEY;index++){ !ZTghX}D  
    if(hCallWnd[index]==NULL) Jqxd92 bI  
     continue; "1a;);S=*)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7NvKp inQ  
    { gv67+Mf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `3\aX|4@  
     bProcessed=TRUE; ("a@V8M`$F  
    } T_*inPf  
   } N@|<3R!N*e  
  } 2;Z 0pPR&  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 r?DCR\Jq  
   for(int index=0;index<MAX_KEY;index++){ chICc</l&  
    if(hCallWnd[index]==NULL) xNIrmqm5]  
     continue; A+l(ew5Lw$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) cSPQ NYU:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); FJ0I&FyWs  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Jr5S8 c|"  
   } 9QU\J0c/  
  } z6`0Uv~  
 } -E}X`?WhD  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  /b=C  
} mu\1hKq;B  
f-M:ap(O  
  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: $OZ= L  
gAqK/9;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); X.<3 /  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); f"7MYw\  
f\R_a/Us  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: O i\ s  
/si<Fp)z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #Vum  
{ }#7l-@{<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ]Za[]E8MD  
 { 3jZGO9ttnS  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 iZNS? ^U  
  SaveBmp(); Mxl;Im]!`.  
  return FALSE; :)lS9<Y}  
 } =q VT  
 …… //其它处理及默认处理 =2$ ( tXL  
} C_J@:HlJ  
|Ahf 01  
kN/YnY*J<  
  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。 ,=+t2Bn  
xgxfPcI  
  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。 `t/j6 e]  
_*H Hdd5I  
  二、编程步骤 CR$wzjP j  
\ ITd\)F%N  
  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"; ec ;  
zTc;-,  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; l>;hQh  
!; >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; O+W<l:|$  
cvsH-uAp  
  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; 4bk`i*-O  
[RXLR#  
  5、 添加代码,编译运行程序。 Fv]6 a n.  
6,5h4[eF*  
三、程序代码 WVR/0l&bU  
a{xJ#_/6  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL {dxFd-K3  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 4FzTf7h^  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 9D14/9*(dU  
#if _MSC_VER > 1000 JtO}i{A  
#pragma once },d^y:m  
#endif // _MSC_VER > 1000 K~d'*J-  
#ifndef __AFXWIN_H__ XYvj3+  
#error include 'stdafx.h' before including this file for PCH dU9;sx  
#endif _&]7  
#include "resource.h" // main symbols 6 rnFXZ\  
class CHookApp : public CWinApp Md4Q.8  
{ ?EC\ .{  
 public: '1D $ ;  
  CHookApp(); 1 3 ]e< '  
  // Overrides *IOrv)  
  // ClassWizard generated virtual function overrides |? V7E\S  
  //{{AFX_VIRTUAL(CHookApp) W(]A^C=/  
 public: B& @ pZYl  
  virtual BOOL InitInstance(); 81E EYf  
  virtual int ExitInstance(); ,f^fr&6jb  
  //}}AFX_VIRTUAL S`vt\g$ dN  
  //{{AFX_MSG(CHookApp) A8tJ&O rwY  
  // NOTE - the ClassWizard will add and remove member functions here. e.vt"eRB  
  // DO NOT EDIT what you see in these blocks of generated code ! z]9t 5I  
  //}}AFX_MSG <( OHX3~  
  DECLARE_MESSAGE_MAP() `qJJ{<1&U  
}; Jk%5Fw0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); C&yZ`[K  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); C<=rnIf'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %.d.h;^T  
BOOL InitHotkey(); $9?:P}$v  
BOOL UnInit(); CF>&mXg\  
#endif * sldv  
curYD~7  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. x'0_lf</ #  
#include "stdafx.h" '!A}.wF0  
#include "hook.h" {F wvuk  
#include <windowsx.h> 'ge$}L}4  
#ifdef _DEBUG 9 C)VW  
#define new DEBUG_NEW O1~7#nJ*4[  
#undef THIS_FILE  el2Wk@*  
static char THIS_FILE[] = __FILE__; &?y@`',a0{  
#endif Ub\^3f  
#define MAX_KEY 100 +ZbNSN=  
#define CTRLBIT 0x04 VLV]e_D6s  
#define ALTBIT 0x02 pnuo;rs  
#define SHIFTBIT 0x01 ~qZ6I)?  
#pragma data_seg("shareddata") $e+4Kt ,  
HHOOK hHook =NULL; :4AIYk=q  
UINT nHookCount =0; CmXLD} L_x  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey pfZ[YC-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT FdE?uw  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey SZXSVz0j  
static int KeyCount =0; 6:wk=#w  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift j_5&w Znq  
#pragma data_seg() L*4"D4V  
HINSTANCE hins; (.=ig X  
void VerifyWindow(); 7>z {2D  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) J;~YD$  
//{{AFX_MSG_MAP(CHookApp) Aa_@&e  
// NOTE - the ClassWizard will add and remove mapping macros here. [;Ih I  
// DO NOT EDIT what you see in these blocks of generated code! T;3qE1c  
//}}AFX_MSG_MAP ]2l}[ w71|  
END_MESSAGE_MAP() "8%$,rG1&  
6am6'_{  
CHookApp::CHookApp() wlP3 XF?  
{ o@N[O^Q V  
 // TODO: add construction code here, 7vXP|8j  
 // Place all significant initialization in InitInstance ll0y@@Iy  
} C-A? mIC  
8Tg1 >q<  
CHookApp theApp;  K!ILO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3Qd/X&P  
{ T O]7cC  
 BOOL bProcessed=FALSE; v {r%/*  
 if(HC_ACTION==nCode) $gnrd~v4e  
 { {96MfhkeBv  
  if((lParam&0xc0000000)==0xc0000000){// Key up :[+8(~| za  
   switch(wParam) [ >mH  
   { D} B?~Lls  
    case VK_MENU: ~ Rk.x +  
     MaskBits&=~ALTBIT; |=ph&9  
     break; UF^[?M =  
    case VK_CONTROL: 6O,k! y>  
     MaskBits&=~CTRLBIT; #w%-IhP  
     break; 7[P-;8)tq  
    case VK_SHIFT: N {{MMIq  
     MaskBits&=~SHIFTBIT; S`YT"|~  
     break; cY5;~lO  
    default: //judge the key and send message  &lU\9  
     break; eI"pRH*f  
   } 9]Ue%%vM  
   for(int index=0;index<MAX_KEY;index++){ h STcL:b   
    if(hCallWnd[index]==NULL) _cJ)v/]  
     continue; CyLwCS{V\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d+G%\qpzQ  
    { DzMg^Kp  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); E9mu:T  
     bProcessed=TRUE; 'm`}XGUBS  
    } . s>@@m-  
   } K" VcPDK  
  } 5?H wM[`  
  else if((lParam&0xc000ffff)==1){ //Key down 9,~7,Py}  
   switch(wParam) }wRm ~  
   { &xB*Shp,B  
    case VK_MENU: w>cqsTq  
     MaskBits|=ALTBIT; Wcc4/:`Hu  
     break; SF-E>s!XL  
    case VK_CONTROL: D'u7"^=  
     MaskBits|=CTRLBIT; l0^cdl-  
     break; u; KM[FmK  
    case VK_SHIFT: LDEc}XXb  
     MaskBits|=SHIFTBIT; ~b*]jZwT  
     break; UFT JobU  
    default: //judge the key and send message p~3 x=X4  
     break; awo'#Y2>  
   } *<S>PbqLw  
   for(int index=0;index<MAX_KEY;index++) sgi5dQ  
   { nK03xYA  
    if(hCallWnd[index]==NULL) @*<0:Q|m  
     continue; D|Q7dIZm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (_4DZMf  
    { L!*+: L DL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ?Xvy0/s5  
     bProcessed=TRUE; #S9J9k  
    } {|>Wwa2e  
   } [m{sl(Q  
  } %m dtVQ@  
  if(!bProcessed){ J;Z2<x/H  
   for(int index=0;index<MAX_KEY;index++){ b MD|  
    if(hCallWnd[index]==NULL) g(tVghHxt$  
     continue; M1WD^?tKQ.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) dq.U#Rhrx  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .B<Bqr@?8  
   } +@^);b6  
  } .Ja].hP  
 } ~Z/,o)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); NW5OLa")J<  
} Q;VuoHj!  
6 /YJA*  
BOOL InitHotkey() Le?g ,c  
{ 3%5YUG@  
 if(hHook!=NULL){ (eU4{X7  
  nHookCount++; xE@/8h  
  return TRUE; P #! N  
 } gZ^Qt.6Z  
 else {aUTTEu  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); aR6F%7gvz  
  if(hHook!=NULL) ^D+^~>f  
   nHookCount++; p,8~)ic_  
  return (hHook!=NULL); h-1?c\Qq:  
} =3(Auchl$Y  
BOOL UnInit() ou-UR5  
{ l90"1I A  
 if(nHookCount>1){ 2rT^OGw6  
  nHookCount--; wjl)yo$z  
  return TRUE; ;DK%!."%  
 } ,\v'%,:C  
 BOOL unhooked = UnhookWindowsHookEx(hHook); D {Ol8:  
 if(unhooked==TRUE){ l[:Aq&[o3  
  nHookCount=0; >-N(o2j3  
  hHook=NULL; M{5AQzvs  
 } R]X 0D.  
 return unhooked; vb]kh _  
} uEJ8Lmi  
3<W%z]k@M  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :6lvX$  
{  iiQn/%  
 BOOL bAdded=FALSE; !5lV#w!vb  
 for(int index=0;index<MAX_KEY;index++){ an"~n`g  
  if(hCallWnd[index]==0){ NCkI[d]B@  
   hCallWnd[index]=hWnd; )pHlWi|h  
   HotKey[index]=cKey; GqRXNs!  
   HotKeyMask[index]=cMask; FiiDmhu  
   bAdded=TRUE; I)'bf/6?  
   KeyCount++; L_Gw:"-+Q  
   break; J;obh.}u"{  
  } G~<UP(G  
 } GA gTy  
 return bAdded; * $f`ouJl  
} ;B=aK"\  
ia'z9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q"qI'*Kgt  
{  viAAb  
 BOOL bRemoved=FALSE; yV8J-YdsG  
 for(int index=0;index<MAX_KEY;index++){ vO1; ;  
  if(hCallWnd[index]==hWnd){ oVy{~D=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ EWD^=VITL  
    hCallWnd[index]=NULL; '3672wF/  
    HotKey[index]=0; 4c< s"2F  
    HotKeyMask[index]=0; #3qeRl  
    bRemoved=TRUE; nFn!6,>E  
    KeyCount--; z;S-Q,  
    break; 3>1^$0iq  
   } Z71m(//*}  
  } Z#d#n!Lz  
 } v~Q'm1!O4\  
 return bRemoved; oa:YAq T  
} /J#(8p  
\A[l(aB  
void VerifyWindow() kCTf>sJe  
{ w95M B*N  
 for(int i=0;i<MAX_KEY;i++){ uMg\s\Z  
  if(hCallWnd!=NULL){ d5m -f/  
   if(!IsWindow(hCallWnd)){ k|)fl l  
    hCallWnd=NULL; ?A3L8^tR  
    HotKey=0; %rptI$^*X  
    HotKeyMask=0; _f[Q\gK  
    KeyCount--; XH!#_jy  
   } p' >i3T(  
  } .ImaM  
 } cFL~< [>_  
} ZkbE&7Z  
8v;^jo>ug  
BOOL CHookApp::InitInstance() BNK]Os  
{ nzflUR{`-  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); zi-_l  
 hins=AfxGetInstanceHandle(); #Lhv=0op  
 InitHotkey(); G|g^yaq>  
 return CWinApp::InitInstance(); nQc#AFg  
} @yuiNj .T  
bT.q@oU  
int CHookApp::ExitInstance() "Q.*  
{ R_PF*q2 '  
 VerifyWindow(); 5Kg'&B (  
 UnInit(); @oAz  
 return CWinApp::ExitInstance(); SB\%"nnV  
} jn2=)KBa_  
A"V mxP  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file B3#G  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) y"JR kJ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ <>3)S`C`p  
#if _MSC_VER > 1000 IO+]^nY `  
#pragma once [r/zBF-.  
#endif // _MSC_VER > 1000 &P?2H66s  
j<<d A[X  
class CCaptureDlg : public CDialog (9'^T.J  
{ 7{|QkTgC  
 // Construction So aqmY;+  
 public: Op'a=4x]  
  BOOL bTray; OBWWcL-  
  BOOL bRegistered; Y 2 @8B6  
  BOOL RegisterHotkey(); Pv'Q3O2<I  
  UCHAR cKey; ,'X"(tpu@  
  UCHAR cMask; L^+rsxR  
  void DeleteIcon(); TLdlPBnr8  
  void AddIcon(); 1^\w7Rew 2  
  UINT nCount; q\Y4vWg  
  void SaveBmp(); C%XO|sP  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor /v R>.'  
  // Dialog Data ZL!u$)(V  
  //{{AFX_DATA(CCaptureDlg) W$c@C02<  
  enum { IDD = IDD_CAPTURE_DIALOG }; n<ZPWlJ  
  CComboBox m_Key; V_+&Y$msi~  
  BOOL m_bControl; @tH9$J*Y<  
  BOOL m_bAlt; x|6]+?l@6  
  BOOL m_bShift; '.mepxf< f  
  CString m_Path; k +-w%  
  CString m_Number; _[2@2q0  
  //}}AFX_DATA S&-K!XyJ  
  // ClassWizard generated virtual function overrides x;/LOa{LR  
  //{{AFX_VIRTUAL(CCaptureDlg) ?E([Nc0T  
 public: P\jGyS j  
  virtual BOOL PreTranslateMessage(MSG* pMsg); & LE5' .s  
 protected: A]z*#+Sl  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7>E.0DP  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2c9?,Le/;  
  //}}AFX_VIRTUAL ]b4WfIu  
  // Implementation *M.xVUPr  
 protected: (eN7s_  
  HICON m_hIcon; j6rNt|  
  // Generated message map functions ";K w?  
  //{{AFX_MSG(CCaptureDlg) >fPo_@O  
  virtual BOOL OnInitDialog(); ZitM<Qi&y  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); /DYyl/  
  afx_msg void OnPaint(); X]0>0=^  
  afx_msg HCURSOR OnQueryDragIcon(); <L &EH@T  
  virtual void OnCancel(); * DL7p8  
  afx_msg void OnAbout(); ScPVjqG2{  
  afx_msg void OnBrowse(); v,KKn\X  
  afx_msg void OnChange(); AJPvwu}D  
 //}}AFX_MSG ;P@]7vkff  
 DECLARE_MESSAGE_MAP() b9.M'P\  
}; >Fel) a  
#endif </h^%mnd  
>L7s[vKn  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file COrk (V  
#include "stdafx.h" Rr )+M3'  
#include "Capture.h" Jz@~$L  
#include "CaptureDlg.h" ?8b19DMK6  
#include <windowsx.h> !|cg=  
#pragma comment(lib,"hook.lib") GtA`0B  
#ifdef _DEBUG P?54"$b  
#define new DEBUG_NEW +EETo):  
#undef THIS_FILE FcDS*ZEk!  
static char THIS_FILE[] = __FILE__; 4.RQ3SoDa  
#endif zKJ2 ~=  
#define IDM_SHELL WM_USER+1 BrV{X&>[i  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z~5) )5Ye;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xUo6~9s7  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; k:@DK9 "^  
class CAboutDlg : public CDialog +a1x;  
{ #~u0R>=  
 public: LFp "Waiv  
  CAboutDlg(); +{J8,^z#  
  // Dialog Data )- C3z   
  //{{AFX_DATA(CAboutDlg) 0 'QWa{dS\  
  enum { IDD = IDD_ABOUTBOX }; P15 H[<:Fz  
  //}}AFX_DATA CD|[PkjW  
  // ClassWizard generated virtual function overrides }r:o8+4  
  //{{AFX_VIRTUAL(CAboutDlg) T<AT&4  
 protected: 4fEDg{T  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }cKB)N BJb  
  //}}AFX_VIRTUAL pfA6?tP`  
  // Implementation zw0w."V  
 protected: +X}i%F'  
  //{{AFX_MSG(CAboutDlg) "t@p9>  
  //}}AFX_MSG 9Em#Ela  
  DECLARE_MESSAGE_MAP() *XVwTW[a  
}; A4K.,bZ   
{$*N1$(%  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |c_qq Bd  
{ jc} G+|`  
 //{{AFX_DATA_INIT(CAboutDlg) TJ|Jv8j<s  
 //}}AFX_DATA_INIT I2cz:U7  
} }f}.>B0#  
x%{]'z  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) B /? L$m  
{ ?pDr"XH~  
 CDialog::DoDataExchange(pDX); PnlI {d  
 //{{AFX_DATA_MAP(CAboutDlg) d=!:UB  
 //}}AFX_DATA_MAP Cy/&KWLenf  
} U|(+-R8Z  
c8RJOc4X  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) em$pU*`P  
 //{{AFX_MSG_MAP(CAboutDlg) y_]+;%w:  
 // No message handlers @ZKf3,J0  
 //}}AFX_MSG_MAP W U(_N*a  
END_MESSAGE_MAP() E8Dh;j  
yU?jmJ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) r~w.J+W  
: CDialog(CCaptureDlg::IDD, pParent) ~%TWF+  
{ =bVPHrKNQ  
 //{{AFX_DATA_INIT(CCaptureDlg)  >@ t  
  m_bControl = FALSE; C@rGa7  
  m_bAlt = FALSE; R%E7 |NAG  
  m_bShift = FALSE; bS.w<V Ew  
  m_Path = _T("c:\\"); DSGcxM+  
  m_Number = _T("0 picture captured."); )G? qX.D  
  nCount=0; d_RgKdR )k  
  bRegistered=FALSE; >tD=t8  
  bTray=FALSE; aQk&#OQy  
 //}}AFX_DATA_INIT |@qw  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 3r\8v`^>  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); d|`Ll  
} l6viP}R  
8xpplo8  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) xNP_>Qa~  
{ 7ubz7*  
 CDialog::DoDataExchange(pDX); p7?  
 //{{AFX_DATA_MAP(CCaptureDlg) vDy&sgS$<  
  DDX_Control(pDX, IDC_KEY, m_Key); p7h#.m~Qu  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); WWT1= #"  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 5{Cz!ut;tE  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); uOxHa>h  
  DDX_Text(pDX, IDC_PATH, m_Path); b}J%4Lx%m  
  DDX_Text(pDX, IDC_NUMBER, m_Number); CSk]c9=  
 //}}AFX_DATA_MAP dWqn7+:  
} *[Hrbln  
5xY{Q  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) #cbgp;,M{I  
//{{AFX_MSG_MAP(CCaptureDlg) S63 Zk0(25  
 ON_WM_SYSCOMMAND() )Q)qz$h@  
 ON_WM_PAINT() BFLef3~.0  
 ON_WM_QUERYDRAGICON() 8;PkuJR_]  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) yNTd_XPL  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) IThd\#=  
 ON_BN_CLICKED(ID_CHANGE, OnChange) . ,7bGY 1$  
//}}AFX_MSG_MAP p!.~hw9  
END_MESSAGE_MAP() n|`3d~9$&  
n ]ikc|  
BOOL CCaptureDlg::OnInitDialog() XtF m5\U  
{ GK?ual1  
 CDialog::OnInitDialog(); HpwMm^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 74s{b]jN'-  
 ASSERT(IDM_ABOUTBOX < 0xF000); |<%!9Z  
 CMenu* pSysMenu = GetSystemMenu(FALSE); KKeMi@N  
 if (pSysMenu != NULL) %!|w(Povq  
 { }d$-:l ,w  
  CString strAboutMenu; ?ukw6T  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?Ua,ba*  
  if (!strAboutMenu.IsEmpty()) Tc2.ciU  
  { VYyija:  
   pSysMenu->AppendMenu(MF_SEPARATOR); W,q @ww u  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); t=_^$M,yr  
  } lQA5HzC\  
 } 50UdY9E_v}  
 SetIcon(m_hIcon, TRUE); // Set big icon 9&Y@g)+2  
 SetIcon(m_hIcon, FALSE); // Set small icon @Z)|_  
 m_Key.SetCurSel(0); \l+v,ELX=  
 RegisterHotkey(); _03?XUKV  
 CMenu* pMenu=GetSystemMenu(FALSE);  %Bq~b$  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Bx\&7|,x  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); V0ze7tSG[f  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 8^mE<  
 return TRUE; // return TRUE unless you set the focus to a control |rmelQ-  
} 4=PjS<Lu8  
!^J;S%MB:K  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^E&PZA\,;  
{ 8$00\><r  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) -(VJ,)8t2  
 { ul{x|R  
  CAboutDlg dlgAbout; mh }M|h5Im  
  dlgAbout.DoModal(); jW/WG tz  
 } |diI(2w  
 else qY_qS=H^  
 { yzK;  
  CDialog::OnSysCommand(nID, lParam);  vSzpx  
 } t0)1;aBZ  
} 8`=?_zF  
8&<:(mAP  
void CCaptureDlg::OnPaint() rTD+7 )E  
{ ?vXgHDs^T  
 if (IsIconic()) gLiJ&H  
 { =u~nLL  
  CPaintDC dc(this); // device context for painting p6M9uu  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); q*!R4yE;C  
  // Center icon in client rectangle 'H1~Zhv  
  int cxIcon = GetSystemMetrics(SM_CXICON); MqmQ52HR  
  int cyIcon = GetSystemMetrics(SM_CYICON); MJn-] E  
  CRect rect; nF3}wCe)  
  GetClientRect(&rect); +ikSa8)*i  
  int x = (rect.Width() - cxIcon + 1) / 2; 9u=A:n\  
  int y = (rect.Height() - cyIcon + 1) / 2; 4;`z6\u9-  
  // Draw the icon ~/OY1~c  
  dc.DrawIcon(x, y, m_hIcon); OvfluFu7  
 } F!z0N&#  
 else .ZXoRT  
 { gt kV=V  
  CDialog::OnPaint(); "~KDm(D  
 } PN* .9;5Z  
} )ycI.[C  
-H| 9 82=  
HCURSOR CCaptureDlg::OnQueryDragIcon() .qBc;u  
{ tr<~:&H4T  
 return (HCURSOR) m_hIcon; wmVmGa R  
} Pk?$\  
Xfiwblg  
void CCaptureDlg::OnCancel() ]HKt7 %,  
{ jP@ @<dt  
 if(bTray) {QG.> lB  
  DeleteIcon(); a`O'ZY  
  CDialog::OnCancel(); .jrNi=BP*  
} .#EU@Hc  
\S}/2]* 1  
void CCaptureDlg::OnAbout() 4,RPidv%O  
{ E^8|xT'h6  
 CAboutDlg dlg; LI,wSTVjC  
 dlg.DoModal(); tBo\R?YRs  
} An2 >]\L  
l4C{LZ  
void CCaptureDlg::OnBrowse() hBgE%#`s  
{ ^WA7X9ed  
 CString str; /9vi  
 BROWSEINFO bi; WfPb7T  
 char name[MAX_PATH]; 6St=r)_  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); |Xt G9A>  
 bi.hwndOwner=GetSafeHwnd(); xAm tm"  
 bi.pszDisplayName=name; S^O9}<2g  
 bi.lpszTitle="Select folder"; !'f7;%7s  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; q4ROuE|d  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); @ @[xTyA  
 if(idl==NULL) Nt>^2Mv   
  return; fit{n]g  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); EJ:O 1  
 str.ReleaseBuffer(); {Jn0G;  
 m_Path=str; wt($trJ  
 if(str.GetAt(str.GetLength()-1)!='\\') ==Gc%  
  m_Path+="\\"; #W\}v(Ke  
 UpdateData(FALSE); ;i@S}LwL  
} Yf0 KG  
}[+uHR6L  
void CCaptureDlg::SaveBmp() =Rd`"]Mnfb  
{ @SfQbM##%  
 CDC dc; IDct!53~  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); k 9i W1  
 CBitmap bm; :EX>Y<`]  
 int Width=GetSystemMetrics(SM_CXSCREEN); fWHvVyQ.  
 int Height=GetSystemMetrics(SM_CYSCREEN); ~yv7[`+Tgg  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @SX%q&-  
 CDC tdc; ki1(b]rf  
 tdc.CreateCompatibleDC(&dc); x0j5D  
 CBitmap*pOld=tdc.SelectObject(&bm); P&`%VW3E  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); N'{[BA(eE  
 tdc.SelectObject(pOld); O|Uz)Y94  
 BITMAP btm; c5]Xqq,  
 bm.GetBitmap(&btm); ~${~To8$CW  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; OG$n C  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size);  "'4  
 BITMAPINFOHEADER bih; j6%W+;{/pj  
 bih.biBitCount=btm.bmBitsPixel; Q-x>yau"  
 bih.biClrImportant=0; #XQ/y}(  
 bih.biClrUsed=0; d4o ^+\  
 bih.biCompression=0; zx@!8Z  
 bih.biHeight=btm.bmHeight; <G pji5f2  
 bih.biPlanes=1; $dfc@Fn^x  
 bih.biSize=sizeof(BITMAPINFOHEADER); T//xxH]w-  
 bih.biSizeImage=size; kn3w6]  
 bih.biWidth=btm.bmWidth; RELNWr  
 bih.biXPelsPerMeter=0; \'|n.1Fr  
 bih.biYPelsPerMeter=0; t:wBh'K~R8  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); xG!~TQ  
 static int filecount=0; 3.W[]zH/u  
 CString name; `gSMb UgF  
 name.Format("pict%04d.bmp",filecount++); l";Yw]:^  
 name=m_Path+name; ]B>76?2W  
 BITMAPFILEHEADER bfh; .7Mf(1:  
 bfh.bfReserved1=bfh.bfReserved2=0; =.`\V]  
 bfh.bfType=((WORD)('M'<< 8)|'B'); m,)s8_a  
 bfh.bfSize=54+size; b,Wm]N  
 bfh.bfOffBits=54; HoPpUq5,  
 CFile bf; .D W>c}1  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @jn&Wf?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); zamMlmls^  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 3y)\dln  
  bf.WriteHuge(lpData,size); `n$Ak5f  
  bf.Close(); "0HUaU,e  
  nCount++; 2|;|C8C  
 } HAn{^8"@  
 GlobalFreePtr(lpData); '?C6P5fm  
 if(nCount==1) yX!u&  
  m_Number.Format("%d picture captured.",nCount); vK!`#W`X  
 else M5no4P<  
  m_Number.Format("%d pictures captured.",nCount); "'CvB0>   
  UpdateData(FALSE); Ic(qA{SM  
} e)uC  
d<-f:}^k0  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) :9QU\{2  
{ ^xHKoOTj[  
 if(pMsg -> message == WM_KEYDOWN) vzS b(  
 { ZN8j})lE  
  if(pMsg -> wParam == VK_ESCAPE) D_lRYLA+  
   return TRUE; 0%bCP/  
  if(pMsg -> wParam == VK_RETURN) ,1ev2T  
   return TRUE; PIH\*2\/  
 } == wX.y\.n  
 return CDialog::PreTranslateMessage(pMsg); lgews"  
} SrKitSG  
+iC:/CJL  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &>qUT]w  
{ /MtmO$ .  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ eu5te0{G  
  SaveBmp(); QVjHGY*R  
  return FALSE; }{F)Ren  
} eJoM4v  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ :[<Y#EX.  
 CMenu pop; ^/#+0/Bn  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); -H%v6E%yh  
 CMenu*pMenu=pop.GetSubMenu(0); Q# hRnM  
 pMenu->SetDefaultItem(ID_EXITICON); o"JH B  
 CPoint pt; I<2`wL=  
 GetCursorPos(&pt); xVPSL#>  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); B?%u< F  
 if(id==ID_EXITICON) ?d%)R*3IX  
  DeleteIcon(); c';~bYZ  
 else if(id==ID_EXIT) ~);4O8~.  
  OnCancel(); s:_hsmc"  
 return FALSE; cB,^?djJ3  
} Fizrsr 6%  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); k^oSG1F  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0se%|Z|8  
 AddIcon(); +c_AAMe  
 return res; )>M L7y  
} Vs 5 &X+k  
|&@q$d  
void CCaptureDlg::AddIcon() 4(\1z6?D  
{ )#AYb   
 NOTIFYICONDATA data; $2Wk#F2c=  
 data.cbSize=sizeof(NOTIFYICONDATA); St?mq* ,  
 CString tip; b]]k\b  
 tip.LoadString(IDS_ICONTIP); TzC(YWt  
 data.hIcon=GetIcon(0); KJFQ)#SW!  
 data.hWnd=GetSafeHwnd(); Mzg'$]N  
 strcpy(data.szTip,tip); 7ZI{A*^vB  
 data.uCallbackMessage=IDM_SHELL; W^elzN(  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; dFg&|Lp  
 data.uID=98; 8nI~iN?"   
 Shell_NotifyIcon(NIM_ADD,&data); q5g_5^csM{  
 ShowWindow(SW_HIDE); >*!T`P}p  
 bTray=TRUE; r5&c!b\  
} iY>x x~V  
5tv*uz|fv  
void CCaptureDlg::DeleteIcon() 2>"{El|PbN  
{ pJg:afCg  
 NOTIFYICONDATA data; tgBA(2/Co  
 data.cbSize=sizeof(NOTIFYICONDATA); wSjy31  
 data.hWnd=GetSafeHwnd(); @d Qr^'h  
 data.uID=98; gS(JgN  
 Shell_NotifyIcon(NIM_DELETE,&data); t>]W+Lx#  
 ShowWindow(SW_SHOW); 0(&uH0x  
 SetForegroundWindow(); p3fV w]N  
 ShowWindow(SW_SHOWNORMAL); ~oOv/1v},  
 bTray=FALSE; NZ`6iK-V_  
} ip'v<%,Q3"  
HV`u#hZ7C  
void CCaptureDlg::OnChange() bY`Chb.  
{ H?opG<R=ek  
 RegisterHotkey(); 3>(~5  
} &[\zs&[@y  
Ge$&k  
BOOL CCaptureDlg::RegisterHotkey() dY?l oFz  
{ ,S(_YS^m  
 UpdateData(); $_ $%L0)5  
 UCHAR mask=0; yMNOjs'c {  
 UCHAR key=0; JF &$'  
 if(m_bControl) f].z.  
  mask|=4; /XRgsF  
 if(m_bAlt) ?{Xp'D\z  
  mask|=2; zh !/24p9  
 if(m_bShift) &m(eMX0lU  
  mask|=1; |q o3 E  
  key=Key_Table[m_Key.GetCurSel()]; $o\U q  
 if(bRegistered){ 'iYaA-9j  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); !/&~Feb  
  bRegistered=FALSE; Vfw +m1sS  
 } !x:w2  
 cMask=mask; /7*qa G  
 cKey=key; /-pop]L  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); If9!S} wa  
 return bRegistered; '9wD+'c=A  
} Us9$,(3  
1_W5@)  
  四、小结 b!37:V\#}  
N~arxe (K  
  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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