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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: `wEb<H  
  .f2bNnB~pP  
  一、实现方法 s?}e^/"v  
H[$"+&q  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: xwq (N_  
>uB# &Q  
#pragma data_seg("shareddata") ]y '>=a|T  
HHOOK hHook =NULL; //钩子句柄 ^A/k)x6  
UINT nHookCount =0; //挂接的程序数目 ` p-cSxR_  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 %p=M;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 G `61~F%  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey :Yh+>c}N  
static int KeyCount =0; u'DRN,h+  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 xGg )Y#  
#pragma data_seg() F^BS/Yag  
Qbn"=n2  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 J/aC}}5D  
CYP q#rd  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: .@U@xRu7|  
^"2J]&x`G  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Om\vMd@!  
cKey,UCHAR cMask) xJ8M6O8  
{ *vxk@ `K~  
 BOOL bAdded=FALSE; mxC;?s;~  
 for(int index=0;index<MAX_KEY;index++){ zu{P#~21  
  if(hCallWnd[index]==0){ ,!y$qVg'\f  
   hCallWnd[index]=hWnd; G4X|Bka  
   HotKey[index]=cKey; #OD/$f_  
   HotKeyMask[index]=cMask; ,m:.-iy?  
   bAdded=TRUE; WPMSm<[  
   KeyCount++; )9`qG:b'  
   break; KL57# gV  
  } ,T$U'&;  
 } +gtbcF@rx  
 return bAdded; 'Aq{UGN  
} 06Sceq  
//删除热键 v%z=ysA  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NP3y+s  
{ J @1!Oq>  
 BOOL bRemoved=FALSE; [D4SW#  
 for(int index=0;index<MAX_KEY;index++){ *C*U5~Zq7:  
  if(hCallWnd[index]==hWnd){ %_W)~Pv{+  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ucW-I;"  
    hCallWnd[index]=NULL; *fS"ym@  
    HotKey[index]=0; 3$>1FoSk  
    HotKeyMask[index]=0; VU]`&`~J  
    bRemoved=TRUE; |N7M^  
    KeyCount--; N +_t-5  
    break; xy[3u?,&s!  
   } | rtD.,m   
  } oIzj,v8$  
 } y I  
 return bRemoved; ,f'CD{E  
} 9F;>W ET  
6}Ci>_i4#  
ag[wdoj  
  DLL中的钩子函数如下: H=vUYz  
`0gyr(fES  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) nT$SfGFj8  
{ WO>nIo5Y  
 BOOL bProcessed=FALSE; A[{yCn`tM  
 if(HC_ACTION==nCode) CxW>~O:  
 { ^%{7}g&$u  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 T_5H&;a  
   switch(wParam) mL{6L?  
   {  "&?kC2Y|  
    case VK_MENU: )g%d:xI  
     MaskBits&=~ALTBIT; `e&Suyf4B  
     break; G}raA%  
    case VK_CONTROL: <=/hi l  
     MaskBits&=~CTRLBIT; L^?qOylu  
     break; +lcbi  
    case VK_SHIFT: 4p;`C  
     MaskBits&=~SHIFTBIT; -- 95Jz  
     break; #r\4sVg  
    default: //judge the key and send message .|fH y  
     break; \V~eVf;~  
   } `mJ6K&t$<  
   for(int index=0;index<MAX_KEY;index++){ j>"@,B g*  
    if(hCallWnd[index]==NULL) J<h $ wM  
     continue; `l[c_%Bm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .?sx&2R2  
    { !M1"b;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3,qr-g|;jM  
     bProcessed=TRUE; ;$wVu|&  
    } U$A]8NZ$S  
   } ^k">A:E2  
  } #h ]g?*}OJ  
  else if((lParam&0xc000ffff)==1){ //有键按下 ?1 4{J]H4  
   switch(wParam) K Z91-  
   { n 0L^e  
    case VK_MENU: S|N_o   
     MaskBits|=ALTBIT; })Vi  
     break; E*K;H8}s  
    case VK_CONTROL: _A9AEi'.  
     MaskBits|=CTRLBIT; zHRplm+ i  
     break; xfe+n$~ c  
    case VK_SHIFT: jm/`iXnMf  
     MaskBits|=SHIFTBIT; `1fY)d^ZS  
     break; >0TxUc_va  
    default: //judge the key and send message 0 /U{p,r6`  
     break; Kis"L(C  
   } yWo; a  
   for(int index=0;index<MAX_KEY;index++){ I1M%J@Cz  
    if(hCallWnd[index]==NULL) VjZ|$k  
     continue; Q/0Tj]D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7;wd(8  
    { U$z-e/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 5<Nx^D  
     bProcessed=TRUE; = m#?neop  
    } `+:`_4  
   } &d^m 1  
  } S;#'M![8  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 =dYqS[kJW  
   for(int index=0;index<MAX_KEY;index++){ k,+0u/I  
    if(hCallWnd[index]==NULL) <R=Zs[9M1  
     continue; >_T-u<E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) s9DYi~/,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); g*C7 '  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 R$[vm6T?  
   } >!1-lfa8  
  } HY:o+ciH'  
 } }00BllJ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); cIOlhX@  
} Z,Dl` w  
M!D3}JRm  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: hT+_(>hT  
VTY 5]|;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .Vvx,>>D  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R(G7m@@{  
o`z]|G1''  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: d|Lj~x|  
^o&. fQ*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 12gU{VD  
{  S9FE  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 0)Wltw~`&  
 { H8}oIA"b  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 6A+nS=  
  SaveBmp(); mtcw#D  
  return FALSE; T!)(Dv8@F  
 } PIS2Ed]  
 …… //其它处理及默认处理 -k"/X8  
} FP4P|kl/9'  
5D//*}b,  
7Kxp=-k  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 lZKi'vg7  
T'Dv.h  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 a~y'RyA  
T%*D~=fQ'  
  二、编程步骤 ]2qo+yB  
TJXT-\Vk  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; w@w(-F!%l  
U26}gT)  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 5vnrA'BhBU  
.V8Lauz8  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; z1X`o  
<*cikXS  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; LG#t<5y~  
{9.|2%a  
  5、 添加代码,编译运行程序。 A#YrWW  
hf&9uHN%7m  
三、程序代码 f x+/C8GK  
CB}2j  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL SSMHoJGm  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) J)p l|I  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ @_}P-h  
#if _MSC_VER > 1000 r$s Qf&=  
#pragma once LyFN.2qw  
#endif // _MSC_VER > 1000 V1B5w_^>h'  
#ifndef __AFXWIN_H__ 1tFNM[R  
#error include 'stdafx.h' before including this file for PCH HY:7? <r  
#endif tf`^v6m%]  
#include "resource.h" // main symbols ds[|   
class CHookApp : public CWinApp =]0&i]z[.  
{ Se =`N  
 public: ,.FxIl ]  
  CHookApp(); %6f*{G w  
  // Overrides /aZ`[m2  
  // ClassWizard generated virtual function overrides z*% q@]ym  
  //{{AFX_VIRTUAL(CHookApp) smo~7;  
 public: B \2 SH%\  
  virtual BOOL InitInstance(); onxLyx|A  
  virtual int ExitInstance(); toC^LZgZ_6  
  //}}AFX_VIRTUAL L) T (<  
  //{{AFX_MSG(CHookApp) Qh\60f>0  
  // NOTE - the ClassWizard will add and remove member functions here. a<bwzX|.  
  // DO NOT EDIT what you see in these blocks of generated code ! T1=fNF  
  //}}AFX_MSG "@2-Zdrr1<  
  DECLARE_MESSAGE_MAP() S;`A{Mow  
}; &&>ekG 9@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); VRB;$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^s"R$?;h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dDLeSz$b  
BOOL InitHotkey(); I51@QJX  
BOOL UnInit(); {F.[&/A  
#endif nZYBE030  
/f;~X"!  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ak!G8'w  
#include "stdafx.h" KJ4.4Zq{c  
#include "hook.h" &gx%b*;`L0  
#include <windowsx.h> Qq|57X)P*  
#ifdef _DEBUG f(MO_Sj]  
#define new DEBUG_NEW @|YH|/RF  
#undef THIS_FILE JT_ `.(  
static char THIS_FILE[] = __FILE__; BLD gt~h#  
#endif A6(/;+n  
#define MAX_KEY 100 DEZve Qr=  
#define CTRLBIT 0x04 9q~s}='"  
#define ALTBIT 0x02 vUM4S26"NT  
#define SHIFTBIT 0x01 P+/e2Y  
#pragma data_seg("shareddata") tK\~A,=  
HHOOK hHook =NULL; Ta\tYZj$  
UINT nHookCount =0; '/s)%bc  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Jdj4\j u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT [Z$[rOF  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey #S"nF@   
static int KeyCount =0; *gWwALGo5  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift $-sHWYZ  
#pragma data_seg() @E|}Y  
HINSTANCE hins; oXF.1f/h  
void VerifyWindow(); #QMz<P/Gl6  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) )\$|X}uny&  
//{{AFX_MSG_MAP(CHookApp) 97!;.f-  
// NOTE - the ClassWizard will add and remove mapping macros here. +52{-a,>  
// DO NOT EDIT what you see in these blocks of generated code! g3y+&Y_  
//}}AFX_MSG_MAP oNF6<A(@$  
END_MESSAGE_MAP() pFjK}J OF  
*J`O"a  
CHookApp::CHookApp() ZPYS$Ydy  
{ 9x =Y^',5  
 // TODO: add construction code here, 6T`i/".  
 // Place all significant initialization in InitInstance b OY |H~  
} /mzlH  
i=2N;sAl  
CHookApp theApp; P5 ywhw-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3(80:@|  
{ e$rZ5X  
 BOOL bProcessed=FALSE; },-H"Qs  
 if(HC_ACTION==nCode) 7-fb.V9  
 { }@d@3  
  if((lParam&0xc0000000)==0xc0000000){// Key up C$`tbq  
   switch(wParam) ' S/gmn  
   { fe_5LC"  
    case VK_MENU: X#^[<5  
     MaskBits&=~ALTBIT; Slc\&Eb  
     break; tc_3sC7jN  
    case VK_CONTROL: - 1gVeT&  
     MaskBits&=~CTRLBIT; .(k|wX[Fu~  
     break; %d9uTm;  
    case VK_SHIFT: >i?oC^QM  
     MaskBits&=~SHIFTBIT; O?#7N[7  
     break; 4{|"7/PE1  
    default: //judge the key and send message ^} >w<'0  
     break; Ml-6OvQ7g  
   } Ab.(7GFK  
   for(int index=0;index<MAX_KEY;index++){ $/Uq0U  
    if(hCallWnd[index]==NULL) {]4LULq  
     continue; sK?twg;D*|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HJ.-Dg5U  
    { KHvYUTY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,Ma^&ypH  
     bProcessed=TRUE; j^RmrOg ,  
    } NC6&x=!3  
   } g *+>H1}  
  } [v!f<zSQK  
  else if((lParam&0xc000ffff)==1){ //Key down _7_Y={4=`  
   switch(wParam) :?1Dko^  
   { 8'y$M] e9n  
    case VK_MENU: 0?|<I{z2  
     MaskBits|=ALTBIT; *.w 9c  
     break; Z6MO^_m2  
    case VK_CONTROL: !0<,@v"  
     MaskBits|=CTRLBIT; 44j*KsBf  
     break; SiN0OB  
    case VK_SHIFT: ]u/sphPe  
     MaskBits|=SHIFTBIT; h^P#{W!e\  
     break; ) Hr`M B  
    default: //judge the key and send message YKK*ER0  
     break; XC#oB~K'  
   } aV0"~5  
   for(int index=0;index<MAX_KEY;index++) ]\HvKCN}  
   { b4Ekqas  
    if(hCallWnd[index]==NULL) 6[AL|d DK  
     continue; KLk~Y0$:v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N?`' /e  
    { !U Ln7\@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); :e+jU5;]3  
     bProcessed=TRUE; QIFgQ0{  
    } .O<obq~;C  
   } 9_h[bBx-'Q  
  } ZXPX,~ 5o  
  if(!bProcessed){ p!AAFmc  
   for(int index=0;index<MAX_KEY;index++){ !C.4<?*|  
    if(hCallWnd[index]==NULL) sU^1wB Rj  
     continue; Pr C{'XDlU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) a(ZcmYzXU  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {Qj~M<@3  
   } @oGcuE  
  } 0#gK6o!  
 } :7;@ZEe  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); H3oFORh  
} P16~Qj  
VuZr:-K/  
BOOL InitHotkey() -yNlyHv9  
{ Z0r'S]fe  
 if(hHook!=NULL){ Zx>=tx}  
  nHookCount++; \o3gKoL%  
  return TRUE; M X]n&  
 } K wVbbC3  
 else t"I77aZ$A  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 1X1dG#:  
  if(hHook!=NULL) *|HY>U.  
   nHookCount++; )0k53-h&  
  return (hHook!=NULL); }c:M^Ff  
} 3Tm+g2w2V8  
BOOL UnInit() d2L&Z_}  
{ I)HPO,7  
 if(nHookCount>1){ 3=V &K-  
  nHookCount--; 'dc#F3  
  return TRUE; |;{6& S  
 } 7 _[L o4_  
 BOOL unhooked = UnhookWindowsHookEx(hHook); -$Ih@2"6  
 if(unhooked==TRUE){ ~)M~EX&pK  
  nHookCount=0; Yx`n:0  
  hHook=NULL; dqcL]e  
 } @>7%qS  
 return unhooked; xN'I/@ kb  
} <%mRSv  
:b!s2n!u  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) X"*5+* z]  
{ ,<X9Y2B  
 BOOL bAdded=FALSE; RPbZ(.  
 for(int index=0;index<MAX_KEY;index++){ +aAc9'k   
  if(hCallWnd[index]==0){ I5W~g.<6  
   hCallWnd[index]=hWnd; #B w0,\  
   HotKey[index]=cKey; IdN41  
   HotKeyMask[index]=cMask; U #0Cx-E  
   bAdded=TRUE; \z)%$#I  
   KeyCount++; JK] PRDyD  
   break; %@Jsal'  
  } MnHNjsO#  
 } ue>D 7\8  
 return bAdded; /g.U&oI]D  
} .fs3>@T"#  
7uk[Oy<_  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) UC$ppTCc?  
{ yWf`rF{  
 BOOL bRemoved=FALSE; zKK9r~ M  
 for(int index=0;index<MAX_KEY;index++){ HK% 7g  
  if(hCallWnd[index]==hWnd){ l%=;  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ MpOc  
    hCallWnd[index]=NULL; V]?R>qhgu  
    HotKey[index]=0; l}P=/#</T  
    HotKeyMask[index]=0; u$`a7Lp,n  
    bRemoved=TRUE; lk=<A"^S  
    KeyCount--; !PE]C!*gv&  
    break; EiaW1Cs  
   } wdoR%b{M  
  } dgP3@`YS  
 } #p{4^  
 return bRemoved; "uf%iJ:%  
} *=xr-!MEk  
 _','9|  
void VerifyWindow() {\\T gs  
{ hCo|HB  
 for(int i=0;i<MAX_KEY;i++){ FC4wwzb  
  if(hCallWnd!=NULL){ f,Ghb~y  
   if(!IsWindow(hCallWnd)){ !TcJ)0   
    hCallWnd=NULL; &,)&%Sg[  
    HotKey=0; A/?7w   
    HotKeyMask=0; c4zR*  
    KeyCount--; 7PF%76TO  
   } 51.%;aY~z  
  } fd9k?,zM  
 } :fJN->wY^s  
} /Gfw8g\}  
@KUWxFak  
BOOL CHookApp::InitInstance() /<BI46B\  
{ *n"{J(Jt`  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); A_UjC`  
 hins=AfxGetInstanceHandle(); o<!?7g{  
 InitHotkey(); |+"(L#wk  
 return CWinApp::InitInstance(); ]{>,rK[So  
} %xt^698&X  
<\S:'g"(  
int CHookApp::ExitInstance() W!(LF7_!  
{ >KKMcTOYY  
 VerifyWindow(); !1b;F*H  
 UnInit(); )WFr</z5bA  
 return CWinApp::ExitInstance(); *gz{.)W  
} BD7N i^qI$  
S`]k>' l  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file "J3x_~,[4m  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ,v}k{( 16{  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ [1H^3g '  
#if _MSC_VER > 1000 -|9=P\U8S  
#pragma once \lNN Msd&  
#endif // _MSC_VER > 1000 M"To&?OI  
|e0`nn=  
class CCaptureDlg : public CDialog /_ajaz%  
{ A+?`?pOm&  
 // Construction Uoix  
 public: BfiD9ka-z  
  BOOL bTray; h zn6kbv  
  BOOL bRegistered; Ssg&QI  
  BOOL RegisterHotkey(); YZJyk:H\  
  UCHAR cKey; 9-m=*|p  
  UCHAR cMask; Qe(:|q _  
  void DeleteIcon(); ku M$UYTTX  
  void AddIcon(); ,MIV=*  
  UINT nCount; 7Fsay+a  
  void SaveBmp(); @9|hMo  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ] @fk] ]R  
  // Dialog Data |(^PS8wG  
  //{{AFX_DATA(CCaptureDlg) MnW+25=N  
  enum { IDD = IDD_CAPTURE_DIALOG }; {BU;$  
  CComboBox m_Key; B#1;r-^P<  
  BOOL m_bControl; IEvdV6{K  
  BOOL m_bAlt; .6 ?U@2  
  BOOL m_bShift; LjHVJSC  
  CString m_Path; vY`s'%WV  
  CString m_Number; Ny)X+2Ae  
  //}}AFX_DATA C+&l< fM&  
  // ClassWizard generated virtual function overrides Eu04e N  
  //{{AFX_VIRTUAL(CCaptureDlg) seeB S/%  
 public: ~4cC/"q$X  
  virtual BOOL PreTranslateMessage(MSG* pMsg); LBP`hK:>W~  
 protected: ?=pT7M  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ENY+^7  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); cj5+N M"  
  //}}AFX_VIRTUAL ]5:8Z@  
  // Implementation )dd@\n$6  
 protected:  %D "I  
  HICON m_hIcon; a C)!T  
  // Generated message map functions 8, >P  
  //{{AFX_MSG(CCaptureDlg) )wh A<lC  
  virtual BOOL OnInitDialog(); "kqPmeI  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); hP&B t  
  afx_msg void OnPaint(); U~7c+}:c  
  afx_msg HCURSOR OnQueryDragIcon(); ufT`"i  
  virtual void OnCancel(); m&yJzMW|  
  afx_msg void OnAbout(); '1/i"yoW  
  afx_msg void OnBrowse(); |$_sX9\`?|  
  afx_msg void OnChange(); @U}1EC{A  
 //}}AFX_MSG H} g{Cr"Ex  
 DECLARE_MESSAGE_MAP() |LKXOU c  
}; DM>eVS3}  
#endif VVOd]2{  
3sZ\0P}   
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ,s;Uf F  
#include "stdafx.h" xKp4*[}m  
#include "Capture.h" =_u4=4  
#include "CaptureDlg.h" 3=ymm^  
#include <windowsx.h> VY\&8n}e(  
#pragma comment(lib,"hook.lib") 9'q*:&qq  
#ifdef _DEBUG <Q?F?.^e  
#define new DEBUG_NEW $iz|\m  
#undef THIS_FILE 4+ Z]3oIRE  
static char THIS_FILE[] = __FILE__; {Y9q[D'g.  
#endif '2^Q1{ :\  
#define IDM_SHELL WM_USER+1 H<N,%G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); i K? w6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Pgea NK5Y  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; cYt!n5w~W  
class CAboutDlg : public CDialog 6!FQzFCZq  
{ VP]%Hni]  
 public: I~XSn>-H  
  CAboutDlg(); cExS7~*  
  // Dialog Data *;*r 8[U}q  
  //{{AFX_DATA(CAboutDlg) PwLZkr@4^  
  enum { IDD = IDD_ABOUTBOX }; -3Vx76Y  
  //}}AFX_DATA d6 5L!4  
  // ClassWizard generated virtual function overrides '!$Rw"K.  
  //{{AFX_VIRTUAL(CAboutDlg) ^y%T~dLkp'  
 protected: V "h +L7T  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @;RXLq/8  
  //}}AFX_VIRTUAL u.Dz~$T  
  // Implementation IO-Ow!  
 protected: [ibu/ W$  
  //{{AFX_MSG(CAboutDlg) vRO _Q?  
  //}}AFX_MSG wAW5 Z0D  
  DECLARE_MESSAGE_MAP() @<&m|qtMsz  
}; d/DB nZN  
o`*,|Nsq  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) D}X\Ca"h  
{ 8-77d^cprR  
 //{{AFX_DATA_INIT(CAboutDlg) 'Qe;vZ31K  
 //}}AFX_DATA_INIT @s2y~0}#  
} 'q:`? nJ^  
:6\qpex  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ]?[fsdAQW  
{ e^D]EA ]%  
 CDialog::DoDataExchange(pDX); FJP-y5  
 //{{AFX_DATA_MAP(CAboutDlg) s-T\r"d=j  
 //}}AFX_DATA_MAP 0:Ol7  
} 3'u-'  
[u*5z.^  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) .0]<k,JZZ  
 //{{AFX_MSG_MAP(CAboutDlg) "a U aotx  
 // No message handlers Y/zj[>  
 //}}AFX_MSG_MAP ~M4;  
END_MESSAGE_MAP() ,nDaqQ-C!!  
 a!AA]  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) TbW38\>.R  
: CDialog(CCaptureDlg::IDD, pParent) ^ (zYzd  
{ W9GVt$T7  
 //{{AFX_DATA_INIT(CCaptureDlg) %d<"l~<5;  
  m_bControl = FALSE; 7O-x<P;  
  m_bAlt = FALSE; _zi|  
  m_bShift = FALSE; WEi2=3dV  
  m_Path = _T("c:\\"); 0Z{ZO*rK  
  m_Number = _T("0 picture captured."); ~FG]wNgS  
  nCount=0; nc|p)  
  bRegistered=FALSE; G*P#]eO  
  bTray=FALSE; ^3L0w}#  
 //}}AFX_DATA_INIT cH t#us  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 V[Ui/M!9Z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ,1o FPa{?  
} j+  0I-p  
VS8Rx.?  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ^,T(mKS  
{ JrRH\+4K  
 CDialog::DoDataExchange(pDX); j HJ`,#  
 //{{AFX_DATA_MAP(CCaptureDlg) L0WN\|D  
  DDX_Control(pDX, IDC_KEY, m_Key); b!5~7Ub.No  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); a HR"n|7{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); y/ ef>ZZ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Gu\q%'I  
  DDX_Text(pDX, IDC_PATH, m_Path); 9m~p0ILh  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ;@Y;g(bw:  
 //}}AFX_DATA_MAP 4u})+2W  
} -z%^)VE  
J]pir4&j  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) N U`  
//{{AFX_MSG_MAP(CCaptureDlg) 6gu!bu`~  
 ON_WM_SYSCOMMAND() &Ys<@M7E:  
 ON_WM_PAINT() C1 GKLl~  
 ON_WM_QUERYDRAGICON() cB}D^O   
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Vb]=B~^`  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ={@6{-tl  
 ON_BN_CLICKED(ID_CHANGE, OnChange) D7Q$R:6|  
//}}AFX_MSG_MAP > jc [nk  
END_MESSAGE_MAP() ]K,Tnyp  
9Y_HyOZ*GX  
BOOL CCaptureDlg::OnInitDialog() 9N 3o-=  
{ p]2128kqx  
 CDialog::OnInitDialog(); R)s:rJQ=p  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); -**g~ty)  
 ASSERT(IDM_ABOUTBOX < 0xF000); Wf>R&o6tr  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 7} 5JDG  
 if (pSysMenu != NULL) 68C%B9.b'  
 { |"CZT#  
  CString strAboutMenu; nazZ*lC  
  strAboutMenu.LoadString(IDS_ABOUTBOX); y,,dCca  
  if (!strAboutMenu.IsEmpty()) -ifFbT+x  
  { 4yA+ h2  
   pSysMenu->AppendMenu(MF_SEPARATOR); 0rs"o-s<  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;RPx^X~  
  } j/c&xv 7=  
 } Sp]0c[37R  
 SetIcon(m_hIcon, TRUE); // Set big icon eiaFaYe\  
 SetIcon(m_hIcon, FALSE); // Set small icon XW)lDiJl  
 m_Key.SetCurSel(0); o~y;j75{.*  
 RegisterHotkey(); c2 C8g1n  
 CMenu* pMenu=GetSystemMenu(FALSE); 2B&3TLO  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 4*cEag   
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); w;:*P  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); }-2 2XYh  
 return TRUE; // return TRUE unless you set the focus to a control nBSYsp{  
} t pQ(g%  
YWO)HsjP  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) bI9~jWgGp  
{ TpwkD_fg  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^7WN{0  
 { kxIF#/8  
  CAboutDlg dlgAbout; a P@N)"  
  dlgAbout.DoModal(); [uN? ~lp\%  
 } =Toy Zm\  
 else q01wbO3-"  
 { h_3E)jc  
  CDialog::OnSysCommand(nID, lParam); fW1CFRHH  
 } ! Y~FLA_  
} ~1AgD-:Jz  
`MN4uC  
void CCaptureDlg::OnPaint() ,77d(bR<  
{ CXx*_@}MU  
 if (IsIconic()) $AjHbU.I{  
 { k1Y?  
  CPaintDC dc(this); // device context for painting j[G  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )e=D(qd  
  // Center icon in client rectangle WH@,kH@  
  int cxIcon = GetSystemMetrics(SM_CXICON); Zbt.t] N  
  int cyIcon = GetSystemMetrics(SM_CYICON); '9Xu p  
  CRect rect; Vl=l?A8  
  GetClientRect(&rect); J7Hl\Q[D1  
  int x = (rect.Width() - cxIcon + 1) / 2; bP$dU,@p~  
  int y = (rect.Height() - cyIcon + 1) / 2; e>7>j@(K]  
  // Draw the icon SaAFz&WRl  
  dc.DrawIcon(x, y, m_hIcon); Q}K"24`=  
 } s %``H`  
 else M@H;pJ+B  
 { 4ber!rJM  
  CDialog::OnPaint(); 'ud{m[|  
 } x$.^"l-vX  
} L;NvcUFn  
yT"Eq"7/Y#  
HCURSOR CCaptureDlg::OnQueryDragIcon() '/n1IM$7  
{ ;yLu R  
 return (HCURSOR) m_hIcon; l<LP&  
} { VfXsI  
r|fL&dtr  
void CCaptureDlg::OnCancel() Zd}9O jz5  
{ y@:h4u"3  
 if(bTray) 0oZ= yh  
  DeleteIcon(); )D5"ap]fX  
  CDialog::OnCancel(); ):68%,  
} M2>Vj/  
M l{Z  
void CCaptureDlg::OnAbout() ,,&* :<Q  
{ 0$)>D==  
 CAboutDlg dlg; vkx7paY_  
 dlg.DoModal(); n,V[eW#m'L  
} c"n\cNP<  
M4oy  
void CCaptureDlg::OnBrowse() r?lf($ D*  
{ r4XK{KHn  
 CString str; p;59?  
 BROWSEINFO bi; y^,1a[U.  
 char name[MAX_PATH]; 0y" $MC v  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); +\c5]`  
 bi.hwndOwner=GetSafeHwnd(); ^T;*M_  
 bi.pszDisplayName=name; :bu/^mW[  
 bi.lpszTitle="Select folder"; P}y +G|  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; +>Qq(Y  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); . y-D16V  
 if(idl==NULL) Pg0x/X{t  
  return; QQ*hCyw!  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); XSe=sHEI  
 str.ReleaseBuffer(); 5T_n %vz  
 m_Path=str; 7$vYo _  
 if(str.GetAt(str.GetLength()-1)!='\\') \FbvHr,  
  m_Path+="\\"; :0j?oY~e  
 UpdateData(FALSE); ,.83m%i  
} ['X]R:3h  
Utj&]RELK  
void CCaptureDlg::SaveBmp() 0neoE E  
{ Qcq`libK  
 CDC dc; nJG U-Z  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); b8`)y<7  
 CBitmap bm; HZzDVCU  
 int Width=GetSystemMetrics(SM_CXSCREEN); G_3O]BMKd)  
 int Height=GetSystemMetrics(SM_CYSCREEN); j^j1  
 bm.CreateCompatibleBitmap(&dc,Width,Height); \:# L)   
 CDC tdc; qPX~@^`9  
 tdc.CreateCompatibleDC(&dc); Sz)' ogl  
 CBitmap*pOld=tdc.SelectObject(&bm); 0_95|3kc  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); \Xt7`I<  
 tdc.SelectObject(pOld); !N\@'F!  
 BITMAP btm; '8RsN-w  
 bm.GetBitmap(&btm); zUkgG61  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; dUeN*Nq&(,  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); BOb">6C  
 BITMAPINFOHEADER bih; JgKO|VO  
 bih.biBitCount=btm.bmBitsPixel; axv>6k  
 bih.biClrImportant=0; ENl)Ts`y  
 bih.biClrUsed=0; c?f4Q,%|  
 bih.biCompression=0; f}#~-.NGs  
 bih.biHeight=btm.bmHeight; c@!_ /0  
 bih.biPlanes=1; $Uq|w[LA  
 bih.biSize=sizeof(BITMAPINFOHEADER); -[4T  
 bih.biSizeImage=size; jiV<+T?  
 bih.biWidth=btm.bmWidth; ^EtMxF@D  
 bih.biXPelsPerMeter=0; P_dCR  
 bih.biYPelsPerMeter=0; u<7/0;D#+  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); knu,"<  
 static int filecount=0; =V, mtT  
 CString name; DbBcQ%  
 name.Format("pict%04d.bmp",filecount++); a?I= !js  
 name=m_Path+name; ?/wm(uL  
 BITMAPFILEHEADER bfh; {NmWQyEv  
 bfh.bfReserved1=bfh.bfReserved2=0; T6y\|  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 'Vzp2  
 bfh.bfSize=54+size;  acajHs  
 bfh.bfOffBits=54; [i21FX  
 CFile bf; `quw9j9`C\  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ L:KF_W.I+  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); G}9Jg  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ~WeM TXF>y  
  bf.WriteHuge(lpData,size); I*:%ni2  
  bf.Close(); !1jBC.G1  
  nCount++; Go`vfm"S  
 } e8>})  
 GlobalFreePtr(lpData); A2I9R;}  
 if(nCount==1) lLX4Gq1  
  m_Number.Format("%d picture captured.",nCount); =57>!)  
 else oA7tE u   
  m_Number.Format("%d pictures captured.",nCount); n$MO4s8)  
  UpdateData(FALSE); YFLZ%(  
} s [RAHU  
dc+>m,3$  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 2.`\  
{ Fd%#78UEo}  
 if(pMsg -> message == WM_KEYDOWN) #5Qpu  
 { |PvPAPy)uu  
  if(pMsg -> wParam == VK_ESCAPE) vONasD9At  
   return TRUE; .wEd"A&j  
  if(pMsg -> wParam == VK_RETURN) *<$*"p  
   return TRUE; ttaM.  
 } I13y6= d  
 return CDialog::PreTranslateMessage(pMsg); a=|K%ii+Y  
} j2t7'bO_  
e@L=LW>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @+&LYy72  
{ x 77*c._3v  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ WA<v9#m  
  SaveBmp(); \#8D>i?m  
  return FALSE; JU4<|5H  
} NlA,'`,  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ oM X  
 CMenu pop; 8 `v-<J  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); /7(W?xOe  
 CMenu*pMenu=pop.GetSubMenu(0); NJ%P/\ C  
 pMenu->SetDefaultItem(ID_EXITICON); po c`q5i+  
 CPoint pt; -mbt4w  
 GetCursorPos(&pt); w1F cB$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); AmUr.ofu  
 if(id==ID_EXITICON) prUN)r@U   
  DeleteIcon(); P7[h-3+^  
 else if(id==ID_EXIT) frm >4)9+  
  OnCancel(); S^JbyD_yoh  
 return FALSE; 6gU96Z  
} <.%4 ! }f8  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Ij7p' a  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) @JiLgIe `  
 AddIcon(); 0.Q Ujw  
 return res; %HhBt5w  
} ,5P0S0*{  
[CTnXb  
void CCaptureDlg::AddIcon() '9%\;  
{ B5,N7z34F  
 NOTIFYICONDATA data; xS5vbJ  
 data.cbSize=sizeof(NOTIFYICONDATA); K6)Gc%:`  
 CString tip; vRTkgH#4l  
 tip.LoadString(IDS_ICONTIP); v1#otrf  
 data.hIcon=GetIcon(0); (fhb0i-  
 data.hWnd=GetSafeHwnd(); 4V"E8rUL(  
 strcpy(data.szTip,tip); 3 #n_?-  
 data.uCallbackMessage=IDM_SHELL; O"+ gQXe  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; kl" hBK#D%  
 data.uID=98; "-M p_O]  
 Shell_NotifyIcon(NIM_ADD,&data); m=1N>cq '  
 ShowWindow(SW_HIDE); w$>u b@=  
 bTray=TRUE; 8:q1~`?5"b  
} %6t:(z  
av(6wht8  
void CCaptureDlg::DeleteIcon() 3RUy, s  
{ fQ7V/x!  
 NOTIFYICONDATA data; eYc$ dPE  
 data.cbSize=sizeof(NOTIFYICONDATA); 8%:Iv(UMk  
 data.hWnd=GetSafeHwnd(); 2/U.| *mH  
 data.uID=98; qRu~$K  
 Shell_NotifyIcon(NIM_DELETE,&data); b;L\EB  
 ShowWindow(SW_SHOW); 7:e{;iG  
 SetForegroundWindow(); :S]\0;8]  
 ShowWindow(SW_SHOWNORMAL); ,10=  
 bTray=FALSE; wC"FDr+  
} M+oHtX$  
XjBW9a  
void CCaptureDlg::OnChange() ,S\CC{!  
{ !OZy7  
 RegisterHotkey(); GWGSd\z  
} U%-A?5  
#j;^\rSv-  
BOOL CCaptureDlg::RegisterHotkey() IM*y|UHt  
{ g/4[N{Xf  
 UpdateData(); (xycJ`N  
 UCHAR mask=0; ?C]vS_jAh  
 UCHAR key=0; 6dHOf,zjm  
 if(m_bControl) z,RhYm  
  mask|=4; Q(G#W+r  
 if(m_bAlt) 2y75  
  mask|=2; x exaQuK  
 if(m_bShift) )',R[|<  
  mask|=1; {.`vs;U  
  key=Key_Table[m_Key.GetCurSel()]; @?ebuj5{e  
 if(bRegistered){ ]IaMp788  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ~"gA,e-)  
  bRegistered=FALSE; cF*TotU_m  
 } Z<oaK  
 cMask=mask; *9 {PEx  
 cKey=key; b\f O8{k  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #x@$ lc=k3  
 return bRegistered; UJUEYG  
} KV91)U  
\eTwXe]Pv  
  四、小结 F k7?xc  
" > ypIR<  
  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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