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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: @OwU[\6fc}  
   2HQHC]  
  一、实现方法 _@?]!J[  
w:z_EV!&  
  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: r'xa' 6&  
{) Y &Vr5  
#pragma data_seg("shareddata") Br-y`s~cP  
HHOOK hHook =NULL; //钩子句柄 #cjB <APY  
UINT nHookCount =0; //挂接的程序数目 #BT= K  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 =YLt?5|e  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 4~Lw:o1a  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey :*}tkr4&eh  
static int KeyCount =0; c{FvMV2em  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ='soSnT  
#pragma data_seg() Z [68ji]  
<;v{`@\j{  
  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。 x6:$lZ(  
"* 'rzd  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: w5qhKu!1  
l9P~,Ec4''  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ukG1<j7.  
cKey,UCHAR cMask) 1AoBsEnd  
{ dQ;rO$c o  
 BOOL bAdded=FALSE; M}38uxP  
 for(int index=0;index<MAX_KEY;index++){ ^@{'! N  
  if(hCallWnd[index]==0){ Nm\I_wjX  
   hCallWnd[index]=hWnd; }=XL^a|V  
   HotKey[index]=cKey; L6l~!bEc  
   HotKeyMask[index]=cMask; m#%5H  
   bAdded=TRUE; ]!0*k#i_.  
   KeyCount++; cC4*4bMm  
   break; DPy"FQYZb  
  } `@Kh>K  
 } {/#?n["  
 return bAdded; atl0#FBd  
} IGv>0LOd@  
//删除热键 V4V TP]'n  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) d&R/fIm  
{ I&>R]DV  
 BOOL bRemoved=FALSE; y1k""75  
 for(int index=0;index<MAX_KEY;index++){ vcV=9q8P1  
  if(hCallWnd[index]==hWnd){ Mc76)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ xwK<f6H!y  
    hCallWnd[index]=NULL; Y*J`Wf(w  
    HotKey[index]=0; To=1B`@-  
    HotKeyMask[index]=0; v]_{oj_(-  
    bRemoved=TRUE; oX?2fu-  
    KeyCount--; FA4bv9:hi  
    break; ''f  
   } $lV0TCgba8  
  } 7 F+w o  
 } \Sm.]=b r  
 return bRemoved; N'2u`br4KP  
} fa<83<.D  
[!bTko>rSB  
<niHJ*  
  DLL中的钩子函数如下: '%K,A-7W  
L & PhABZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) LuQ=i`eXx  
{ /!7m@P|&D  
 BOOL bProcessed=FALSE; B;7L:  
 if(HC_ACTION==nCode)  299; N  
 { 7 NJ1cQ-}t  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 m"+9[d_u  
   switch(wParam) xx9qi^  
   {  tLV9b %i(  
    case VK_MENU: yt_?4Hc"  
     MaskBits&=~ALTBIT; o{zo-:>Jp  
     break; {I(Euk>lR  
    case VK_CONTROL: K6|*-Wo.  
     MaskBits&=~CTRLBIT; 'lIT7MK  
     break; :/Sx\Nz78  
    case VK_SHIFT: -V4@BKI8  
     MaskBits&=~SHIFTBIT; o*r\&!NIw  
     break; v?d~H`L  
    default: //judge the key and send message JNX7]j\  
     break; "v ^Q !  
   } 8 kd  
   for(int index=0;index<MAX_KEY;index++){ Pf@8C{I  
    if(hCallWnd[index]==NULL) k[G?22t  
     continue; Cww$ A %}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _W?}%;  
    { oN)K2&M0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :X2B+}6_&  
     bProcessed=TRUE; c&F"tLl  
    } >@y5R^B`  
   } . 6Bz48*  
  } S ._9  
  else if((lParam&0xc000ffff)==1){ //有键按下 c9f~^}jNb  
   switch(wParam) $&lS7}  
   { h'kgL~+$  
    case VK_MENU: #^Sd r-   
     MaskBits|=ALTBIT; CS6,mX  
     break; 5:56l>0  
    case VK_CONTROL:  '+'  
     MaskBits|=CTRLBIT; ]j_S2lt  
     break; hc~--[1c:  
    case VK_SHIFT: >Qt#6X|  
     MaskBits|=SHIFTBIT; mC J/gWDY  
     break; =_Qt&B)  
    default: //judge the key and send message - n11L  
     break; n%Nf\z  
   } ]km8M^P  
   for(int index=0;index<MAX_KEY;index++){ (x?A#o>%  
    if(hCallWnd[index]==NULL) T#er5WOH  
     continue;  l R;<6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1 ht4LRFi  
    { h r t\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [/5>)HK} C  
     bProcessed=TRUE; `iQyKZS/+  
    }  dsJ}C|N  
   } $WTu7lVV[1  
  } #2x\d  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ~Bj-n6QDE  
   for(int index=0;index<MAX_KEY;index++){ yUEUIPL  
    if(hCallWnd[index]==NULL) {b]WLBy  
     continue; d \0K 3=h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _!w# {5~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Ak>RLD25_  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 =X-$k k  
   } 0~n= |3*P  
  } ^HC! my  
 } iFga==rw  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }5DyNfZ]+0  
} (Rs<'1+>  
\<;/)!Nmw  
  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: O^sgUT1O  
}t"!I\C  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %{o5 }TqD  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); I uhyBo  
iM}cd$r{  
  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: Vs9fAAXS4  
y . AN0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zjVb+Z\n  
{ SznNvd <  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ^@L  
 { y"2#bq  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $,'r} %  
  SaveBmp(); V3F2Z_VH2  
  return FALSE; p[g!LD  
 } HM ^rk  
 …… //其它处理及默认处理 !m]76=@  
} >I!dJH/gj  
a=C?fh  
k]I<%  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ]RGun GJ  
%;ny  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 :vV?Yv%P)n  
bpKb<c  
  二、编程步骤 !f_Kq$.{  
Q.vtU%T  
  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 /> .P  
|@V<}2zCZ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; c$ 1ez  
&8~U&g6C  
  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; *:GoS?Ma  
MIi:\m5  
  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;  q#MA A_  
V{c n1Af  
  5、 添加代码,编译运行程序。 eQzSWn[  
JX>_imo  
三、程序代码 _gw~A {O  
_(oJ8h(  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL kdg Q -UN$  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 3#5sj >  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ lC^q}Bh:  
#if _MSC_VER > 1000 VI37  
#pragma once $Fr$9 jq&  
#endif // _MSC_VER > 1000 Eepy%-\  
#ifndef __AFXWIN_H__ -C.eXR{s  
#error include 'stdafx.h' before including this file for PCH =`.9V<  
#endif Nu|?s-   
#include "resource.h" // main symbols 9> [ $;>  
class CHookApp : public CWinApp #J1a `}x  
{ s}/YcUK  
 public: OG}0{?  
  CHookApp(); E-Cj^#OY|N  
  // Overrides >/evL /  
  // ClassWizard generated virtual function overrides ) ~ C)4  
  //{{AFX_VIRTUAL(CHookApp) wK|&[m s  
 public: d]w*fn  
  virtual BOOL InitInstance(); =p^*y-z  
  virtual int ExitInstance(); 3}Uae#oy  
  //}}AFX_VIRTUAL HLTz|P0JZ  
  //{{AFX_MSG(CHookApp) 2Ni2Gkf@  
  // NOTE - the ClassWizard will add and remove member functions here. =}_c=z?UY  
  // DO NOT EDIT what you see in these blocks of generated code ! *i)GoQoB  
  //}}AFX_MSG &bA;>Lu#|o  
  DECLARE_MESSAGE_MAP() [(UQQa=+  
}; `Mp]iD {  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 8 rnr>Ee@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .>h|e_E  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); VZw("a*TB  
BOOL InitHotkey(); >;0z-;k6  
BOOL UnInit(); 4[rD|  
#endif 9u"im+=:  
@Q TG  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Z#^2F8,]  
#include "stdafx.h" &W|'rA'r  
#include "hook.h" S@Jl_`<  
#include <windowsx.h> 85Ms*[g  
#ifdef _DEBUG Y@;bA=Du}  
#define new DEBUG_NEW /kNr5s  
#undef THIS_FILE vC+mC4~/(  
static char THIS_FILE[] = __FILE__; Q7`zrCh  
#endif .8fOc.h8h  
#define MAX_KEY 100 W 6~<7  
#define CTRLBIT 0x04 ou96 P<B  
#define ALTBIT 0x02 Gz ^g!N[  
#define SHIFTBIT 0x01 24|:VxO  
#pragma data_seg("shareddata") kD"dZQx  
HHOOK hHook =NULL; wBCnP  
UINT nHookCount =0; f)N67z6  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey @CWfhc-Ub  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT )e]:T4*vo  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey q;Qpd]H  
static int KeyCount =0; ]Jv Z:'g}  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift .L6t3/^  
#pragma data_seg() 7.akp  
HINSTANCE hins; )M^;6S  
void VerifyWindow(); b]CJf8'u  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) M`iJ6L  
//{{AFX_MSG_MAP(CHookApp) qfN<w&P  
// NOTE - the ClassWizard will add and remove mapping macros here. vWzNsWPK"{  
// DO NOT EDIT what you see in these blocks of generated code! LF{qI?LG  
//}}AFX_MSG_MAP )pJ}o&J  
END_MESSAGE_MAP() ?MO'WB9+JR  
`4Nc(aUr  
CHookApp::CHookApp() `4l>%S8y:  
{ %3"3OOT7  
 // TODO: add construction code here, V}@c5)(j  
 // Place all significant initialization in InitInstance bCA3w%,kM  
} ]:]2f 9y  
hoSk  
CHookApp theApp; s7T=/SC54  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 2yeq2v   
{ !YAkHrF`[0  
 BOOL bProcessed=FALSE; H${Ym BG  
 if(HC_ACTION==nCode) v  mw7H  
 { r|0C G^:C  
  if((lParam&0xc0000000)==0xc0000000){// Key up iHQFieZ.E  
   switch(wParam) A+ Z3b:}~  
   { $W` &7  
    case VK_MENU: :GGsQ n  
     MaskBits&=~ALTBIT; D {>, 2hC  
     break; 0Wv9K~F  
    case VK_CONTROL: Tz%l 9aC  
     MaskBits&=~CTRLBIT; nc@ul')  
     break; -cIc&5CS  
    case VK_SHIFT: yf_<o   
     MaskBits&=~SHIFTBIT; '_(oa<g  
     break; QZQ@C#PR;  
    default: //judge the key and send message ;|9VPv/  
     break; o)1wF X  
   } lywcT! <  
   for(int index=0;index<MAX_KEY;index++){ 1\zI#"b ^  
    if(hCallWnd[index]==NULL) Zj`eR\7~  
     continue; 1mA)=hu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ig$5Ui  
    { n>Zkx+jLj<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =U|J{^ >I  
     bProcessed=TRUE; EKwS~G.b!  
    } X(E f=:  
   } )Q7;)iPY#  
  } u'?t'I  
  else if((lParam&0xc000ffff)==1){ //Key down @A$%baH0  
   switch(wParam) Q"Q|]f*  
   { q@Q|oB0W$)  
    case VK_MENU: $Q]`+:g*}  
     MaskBits|=ALTBIT; ;x+4jpH]B  
     break; x2|DI)J1'  
    case VK_CONTROL: Km\M /j|  
     MaskBits|=CTRLBIT; ub.pJJlC  
     break; yu}4L'e  
    case VK_SHIFT: ,{zvGZ|  
     MaskBits|=SHIFTBIT; MQ,$'Y5~H  
     break; | b@?]M  
    default: //judge the key and send message |Zkcs]8M!  
     break; !K`;fp!  
   } Xb6@;G"  
   for(int index=0;index<MAX_KEY;index++) $o]suF;3  
   { EXb{/4  
    if(hCallWnd[index]==NULL) %y8w9aGt  
     continue; Jz3q Pr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j:{<    
    { & qd:o}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); n=hz7tjaz  
     bProcessed=TRUE; W,wg@2  
    } |#!25qAT  
   } 9(u2jbA  
  } TD\QX2m  
  if(!bProcessed){ Lg9ktRKK  
   for(int index=0;index<MAX_KEY;index++){ xx/DD%IZ  
    if(hCallWnd[index]==NULL) |k?,4 Pk  
     continue; [C7:Yg7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .fQDj{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); TzX>d<x  
   } Vvv -f  
  } }8x[  
 } A$1pMG~as  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Y]P $|JW):  
} C-4I e  
sU+~#K$ b  
BOOL InitHotkey() s,` n=#  
{ +{Q\B}3cj1  
 if(hHook!=NULL){ i<%(Z[9Lk  
  nHookCount++; .dM 0  
  return TRUE; /a9+R)Al  
 } zRf]SZ(t O  
 else YK"({Z>U  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ZO0_:T#Z  
  if(hHook!=NULL) _KD(V2W  
   nHookCount++; ijoR(R^r  
  return (hHook!=NULL); +8 6\&y)  
} .:<c[EJ b  
BOOL UnInit() dcXtT3,kpX  
{ i37W^9 R  
 if(nHookCount>1){ !pDS*{)E  
  nHookCount--; D0"+E*   
  return TRUE; CsuSg*#X+  
 } H<1C5-  
 BOOL unhooked = UnhookWindowsHookEx(hHook); :()4eK/\  
 if(unhooked==TRUE){ wBeOMA  
  nHookCount=0; &dOV0y_  
  hHook=NULL; 45ct*w  
 } ^Jc~G~x4*  
 return unhooked; uP+ j_is  
} `o:)PTQNg  
$g 1p!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  JTz1M~  
{ @&h<jM{D  
 BOOL bAdded=FALSE; 0*tEuJ7  
 for(int index=0;index<MAX_KEY;index++){ * z{D}L-&  
  if(hCallWnd[index]==0){ S6]D;c8GE  
   hCallWnd[index]=hWnd; 's&Vg09D,  
   HotKey[index]=cKey; '*)!&4f  
   HotKeyMask[index]=cMask; U ][.ioc  
   bAdded=TRUE; bF B;N+>  
   KeyCount++; xn6E f"  
   break; QjZ}*p  
  } #!, xjd  
 } ,pAMQ5  
 return bAdded; [ >vS+G  
} y& Dd  
8mCr6$|%  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %*jpQOw  
{ XWB>' UDQ#  
 BOOL bRemoved=FALSE; ef53~x  
 for(int index=0;index<MAX_KEY;index++){ Odbjl[>k  
  if(hCallWnd[index]==hWnd){ C*c=@VAa  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8<_WtDg  
    hCallWnd[index]=NULL; `5q`ibyPI  
    HotKey[index]=0; {]Lc]4J  
    HotKeyMask[index]=0; gHox{*hb[  
    bRemoved=TRUE; mZq*o<kTA  
    KeyCount--; =8tdu B  
    break; }n:-nB4  
   } -3w? y  
  } AY! zXJ_$  
 } =}Cb?C[;  
 return bRemoved; V8,$<1Fi;-  
}  *riGi  
RmzK?muk  
void VerifyWindow() MN1|k  
{ \Dt0 } ?;k  
 for(int i=0;i<MAX_KEY;i++){ % yJs"%  
  if(hCallWnd!=NULL){ ShSh/0   
   if(!IsWindow(hCallWnd)){ x,p|n  
    hCallWnd=NULL; @aj"1 2  
    HotKey=0; 5_`.9@eh.  
    HotKeyMask=0; /&kTVuN"(  
    KeyCount--; Z2 t0l%  
   } F92n)*[  
  } q<;9!2py  
 } ly^F?.e-  
} yGN<.IP75  
"CZ`hx1|^  
BOOL CHookApp::InitInstance() _L: /2  
{ *$hO C%(  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); - iJ[9O  
 hins=AfxGetInstanceHandle(); w$& 10  
 InitHotkey(); y XS/3_A{  
 return CWinApp::InitInstance(); 69IBG,N'  
} s';jk(i3  
^ro?.,c T  
int CHookApp::ExitInstance() S++}kR);  
{ ZZeqOu7^  
 VerifyWindow(); u\Xi]pZ@X]  
 UnInit(); "M? (Ax  
 return CWinApp::ExitInstance(); my04>6j0  
} *, {b]6v  
n P69W  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file wef QmRK  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 1p{\jCi, 2  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^&cI+xZ2Y  
#if _MSC_VER > 1000 mBnC]$<R  
#pragma once uF< F4m;  
#endif // _MSC_VER > 1000 Duz}e80  
>iG`  
class CCaptureDlg : public CDialog xy|;WB  
{ 63k8j[$  
 // Construction IAtc^'l#  
 public: ^Yn6kF  
  BOOL bTray; 5E.cJ{   
  BOOL bRegistered; AS8T!  
  BOOL RegisterHotkey(); Ky$ <WZs  
  UCHAR cKey; 1x\%VtO>\b  
  UCHAR cMask; sA` bPhk  
  void DeleteIcon(); N>gv!z[E  
  void AddIcon(); Ii4 Byyfx  
  UINT nCount; ; 4S#6#  
  void SaveBmp(); ;JAe=wt^'I  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor F oEZ1O<  
  // Dialog Data Qp-nr]  
  //{{AFX_DATA(CCaptureDlg) 778L[wYe  
  enum { IDD = IDD_CAPTURE_DIALOG }; UQTt;RS*zS  
  CComboBox m_Key; v#nFPB=z  
  BOOL m_bControl; [u-~<80  
  BOOL m_bAlt; "5>p]u>  
  BOOL m_bShift; v3hNvcMpf  
  CString m_Path; *1>XlVx,  
  CString m_Number; a?D\H5TF-  
  //}}AFX_DATA ZegsV|  
  // ClassWizard generated virtual function overrides H,\c"  
  //{{AFX_VIRTUAL(CCaptureDlg) X}? cAo2N  
 public: op"Cc  
  virtual BOOL PreTranslateMessage(MSG* pMsg); }uZh oA  
 protected: hL8QA!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support MiRMjQ2  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ^ ]`<nO  
  //}}AFX_VIRTUAL WM>9sJf  
  // Implementation d;'@4NX5+  
 protected: c| p eRO.  
  HICON m_hIcon; 4RdpROK  
  // Generated message map functions K` U\+AE  
  //{{AFX_MSG(CCaptureDlg) u2!8'-Ai  
  virtual BOOL OnInitDialog(); ; /EH@V|  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); R?I(f(ib   
  afx_msg void OnPaint(); Q <78< #I  
  afx_msg HCURSOR OnQueryDragIcon(); gp$+Qd  
  virtual void OnCancel(); .$?s :t  
  afx_msg void OnAbout(); *D|6g| Hb  
  afx_msg void OnBrowse(); h`5au<h<  
  afx_msg void OnChange(); P;A"`Il  
 //}}AFX_MSG N\xqy-L9  
 DECLARE_MESSAGE_MAP() D* Vr)J  
}; * y`^Fc  
#endif ?+dI/jB4X  
Y6g[y\*t  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;E##bdSCA  
#include "stdafx.h" wd1*wt  
#include "Capture.h" ;2bG-v'4vO  
#include "CaptureDlg.h" eo,m ^&  
#include <windowsx.h> JfC.U,7Nc  
#pragma comment(lib,"hook.lib") ,ZH)[P)5P  
#ifdef _DEBUG "-I>  
#define new DEBUG_NEW Imv kB~8N  
#undef THIS_FILE  5+VdZ'@  
static char THIS_FILE[] = __FILE__; ;ATk?O4T  
#endif i?mDR$X:  
#define IDM_SHELL WM_USER+1 hbN*_[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); nY(jN D  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '6K WobXm  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; na/t=<{  
class CAboutDlg : public CDialog -h.' ]^I  
{ =Ybbh`$<  
 public: |w\D6d]o  
  CAboutDlg(); 85nUR [)h  
  // Dialog Data F\>`j   
  //{{AFX_DATA(CAboutDlg) i8A5m@,G  
  enum { IDD = IDD_ABOUTBOX }; |!&,etu  
  //}}AFX_DATA F,4Q  
  // ClassWizard generated virtual function overrides &A%#LVjf  
  //{{AFX_VIRTUAL(CAboutDlg) xb1)ZJH  
 protected: 8xL-j2w  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8mx5K-/,y^  
  //}}AFX_VIRTUAL a@m>S$S  
  // Implementation Lmj?V1% V  
 protected: N}s[0s  
  //{{AFX_MSG(CAboutDlg) NUm3E4  
  //}}AFX_MSG BHU(Hd  
  DECLARE_MESSAGE_MAP() Z., Pl  
}; [S$)^>0  
jixU9]  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) fzSZ>I0R  
{ I ][8[UZ  
 //{{AFX_DATA_INIT(CAboutDlg) Lw-j#}&6E  
 //}}AFX_DATA_INIT b_][Jye&P  
} /&ph-4\i  
A$|> Jt  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Npq=jlj  
{ ]c$%;!ZE  
 CDialog::DoDataExchange(pDX); 6bfk4k  
 //{{AFX_DATA_MAP(CAboutDlg) s31^9a  
 //}}AFX_DATA_MAP \@I.K+hj$  
} }S%a]  
(<1DPpy95O  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) {|> ~#a49h  
 //{{AFX_MSG_MAP(CAboutDlg) 12cfqIo9  
 // No message handlers Sqfa,3?L  
 //}}AFX_MSG_MAP 5t0i/&zX  
END_MESSAGE_MAP() c*6o{x}K  
h2,A cM  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) yhUc]6`V.H  
: CDialog(CCaptureDlg::IDD, pParent) IK}T. *[  
{ =m-_0xo  
 //{{AFX_DATA_INIT(CCaptureDlg)  Ya=QN<  
  m_bControl = FALSE; yP[GU| >(  
  m_bAlt = FALSE; (U-p&q>z  
  m_bShift = FALSE; Zwq uS9  
  m_Path = _T("c:\\"); MRmz/ZmRM  
  m_Number = _T("0 picture captured."); b8QW^Z  
  nCount=0; E8IWHh_  
  bRegistered=FALSE; +Cau/sPXL  
  bTray=FALSE; 0&EX -DbV  
 //}}AFX_DATA_INIT =U@*adgw  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 U7:~@eYy  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); y@hdN=-  
} A7: oq7b  
]`u{^f  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) z<@$$Z=0UF  
{ 3ON]c13  
 CDialog::DoDataExchange(pDX); v[lytX4)  
 //{{AFX_DATA_MAP(CCaptureDlg) 21cIWvy  
  DDX_Control(pDX, IDC_KEY, m_Key); R HF;AX n  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Yh"Z@D[d  
  DDX_Check(pDX, IDC_ALT, m_bAlt); /G84T,H  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); So!1l7b  
  DDX_Text(pDX, IDC_PATH, m_Path); iY( hGlV  
  DDX_Text(pDX, IDC_NUMBER, m_Number); WqTW@-}ID  
 //}}AFX_DATA_MAP Q~*A`h#  
} ((X"D/F]  
gqe z-  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 3V,X=  
//{{AFX_MSG_MAP(CCaptureDlg) hefV0)4K  
 ON_WM_SYSCOMMAND() 5^%^8o  
 ON_WM_PAINT() bfa5X<8  
 ON_WM_QUERYDRAGICON() _I'O4s1S  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ClfpA?vv  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ?xeq*<qfI  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 2TAy'BB;)  
//}}AFX_MSG_MAP _q8s 7H  
END_MESSAGE_MAP() FtF!Dtv  
=z@'vu$Fh  
BOOL CCaptureDlg::OnInitDialog() ";>D0h^D  
{ Jl^oDW  
 CDialog::OnInitDialog(); ;$0za]x  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Sb{S^w\m0  
 ASSERT(IDM_ABOUTBOX < 0xF000); )6AOP-M.9  
 CMenu* pSysMenu = GetSystemMenu(FALSE); W<9G wMU  
 if (pSysMenu != NULL) k $+&  
 { G\P*zz Sq  
  CString strAboutMenu; SQt$-<>4\  
  strAboutMenu.LoadString(IDS_ABOUTBOX); s&fU|Jk8  
  if (!strAboutMenu.IsEmpty()) ,e>ugI_;*  
  { 1pz6e8p:m  
   pSysMenu->AppendMenu(MF_SEPARATOR); fc!%W#-  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); B8IfE`  
  } ~ 4&_$e!  
 } eueXklpg+  
 SetIcon(m_hIcon, TRUE); // Set big icon mCq*@1Lp9  
 SetIcon(m_hIcon, FALSE); // Set small icon bH,Jddc  
 m_Key.SetCurSel(0); P- vA.7  
 RegisterHotkey(); NgH%  
 CMenu* pMenu=GetSystemMenu(FALSE); ob*2V! "  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]=_BK!O  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); !C/`"JeYL  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 525xm"Bs  
 return TRUE; // return TRUE unless you set the focus to a control fnXl60C%  
} uM4,_)L  
ow`\7qr  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) _ l/6Qpf  
{ a%-Yl%#  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) )}6:Ke)  
 { bxyU[`  
  CAboutDlg dlgAbout; ME |"pJ  
  dlgAbout.DoModal(); _wX'u,HrC  
 } TZHqn6  
 else 1 9)78kV{  
 { Q!|71{5U  
  CDialog::OnSysCommand(nID, lParam); / Sp+MB9  
 } pkM32v-  
} !BQ!] u  
;eA~z"g  
void CCaptureDlg::OnPaint() j}ruXg  
{ Xt~/8)&  
 if (IsIconic()) S[ 2`7'XV  
 { Ads^y`b  
  CPaintDC dc(this); // device context for painting W``e6RX-  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ")o.x7~N  
  // Center icon in client rectangle $iF7hyZ  
  int cxIcon = GetSystemMetrics(SM_CXICON); 9r)5d&,6  
  int cyIcon = GetSystemMetrics(SM_CYICON); |]B]0J#_  
  CRect rect; $~9U-B\  
  GetClientRect(&rect); ( NiuAy  
  int x = (rect.Width() - cxIcon + 1) / 2; U O[p   
  int y = (rect.Height() - cyIcon + 1) / 2; m<076O4|`  
  // Draw the icon hA~}6Qn  
  dc.DrawIcon(x, y, m_hIcon); .t}nznh  
 } UbuxD})  
 else wicg8[T=B  
 { PB9<jj;  
  CDialog::OnPaint(); @B[=`9KF[  
 } m1`ln5(R  
} "/\:Fdc^  
:Z+(H+lyZ  
HCURSOR CCaptureDlg::OnQueryDragIcon() 5 WAsEP  
{ o-(jSaH :;  
 return (HCURSOR) m_hIcon; xr?r3Y~^e  
} R'80{  
bRIb'%=+GA  
void CCaptureDlg::OnCancel() W>, b1_k c  
{ 4<O[d  
 if(bTray) AM}OL Hj  
  DeleteIcon(); rFmE6{4:p  
  CDialog::OnCancel(); ph|3M<q6  
} ) .]Z}g&  
4mPg; n  
void CCaptureDlg::OnAbout() */S ,CV  
{ Yhx~5p  
 CAboutDlg dlg; OrRve$U*|  
 dlg.DoModal(); RnTPU`  
} O=+C Kx@  
*]H ./a:1  
void CCaptureDlg::OnBrowse() _R8-Hj E  
{ R2;-WxnN]  
 CString str; ~7Jc;y&  
 BROWSEINFO bi; w!xSYh')  
 char name[MAX_PATH]; QR,i b  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); T*H4kM  
 bi.hwndOwner=GetSafeHwnd(); 66BsUA.h  
 bi.pszDisplayName=name; '~a!~F~>  
 bi.lpszTitle="Select folder"; ; aMMI p  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 2Nj0 Hqjq  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); `bxgg'V  
 if(idl==NULL) r<0 .!j%c  
  return; zPVA6~|l  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); N .SszZh  
 str.ReleaseBuffer(); Nd( $s[  
 m_Path=str; 9PGSr4V 1  
 if(str.GetAt(str.GetLength()-1)!='\\') _PRm4 :  
  m_Path+="\\"; }ShZ4 xMz  
 UpdateData(FALSE); Zwq_&cJK  
} ,v^it+Jc'  
JY_' d,O  
void CCaptureDlg::SaveBmp() jbg@CA*=C  
{ 6DExsB~@  
 CDC dc; eH6#'M4+\  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); fY6&PuDf.  
 CBitmap bm; &9O-!  
 int Width=GetSystemMetrics(SM_CXSCREEN); \C>I6{  
 int Height=GetSystemMetrics(SM_CYSCREEN); *D9QwQ _|  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 3W27R  
 CDC tdc; sDwSEg>#B  
 tdc.CreateCompatibleDC(&dc); t;? q#!uc  
 CBitmap*pOld=tdc.SelectObject(&bm); V1Fdt+#  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); LOOv8'%O8  
 tdc.SelectObject(pOld); )>?K:y8I~  
 BITMAP btm; j0OxR.S  
 bm.GetBitmap(&btm); {X<tUco  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Karyipn}  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); .+8w\>w6g  
 BITMAPINFOHEADER bih; Cx@,J\rsQ  
 bih.biBitCount=btm.bmBitsPixel; 'DKP-R"  
 bih.biClrImportant=0; {j(,Q qB;f  
 bih.biClrUsed=0; 6ZF5f^M^  
 bih.biCompression=0; <CH7jbK  
 bih.biHeight=btm.bmHeight; p2cKtk+  
 bih.biPlanes=1; i,V~5dE[I<  
 bih.biSize=sizeof(BITMAPINFOHEADER); :0vNg:u+  
 bih.biSizeImage=size; . Bv;Zv  
 bih.biWidth=btm.bmWidth; jgC/  
 bih.biXPelsPerMeter=0; |w:\fK[  
 bih.biYPelsPerMeter=0; ho0T$hB  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )v'DQAL  
 static int filecount=0; Kj}}O2  
 CString name; }F\0Bl&  
 name.Format("pict%04d.bmp",filecount++); ap=_odW~p  
 name=m_Path+name; rfK%%-  
 BITMAPFILEHEADER bfh; ~Ipl'cE  
 bfh.bfReserved1=bfh.bfReserved2=0; :,cSEST  
 bfh.bfType=((WORD)('M'<< 8)|'B'); _El=M0  
 bfh.bfSize=54+size; 4w\')@`[jk  
 bfh.bfOffBits=54; $ A ( #^&  
 CFile bf; ,qC_[PUT  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Qn6&M  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 9oN b= .  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Qg4qjX](?  
  bf.WriteHuge(lpData,size); Ye,E7A*L  
  bf.Close(); Z*leEwgz  
  nCount++; M~^|dR)D  
 }  9((v.  
 GlobalFreePtr(lpData); > ^D10Nf*  
 if(nCount==1) ]ErAa"?  
  m_Number.Format("%d picture captured.",nCount); :vm*miOF  
 else #2n>J'}  
  m_Number.Format("%d pictures captured.",nCount); :r!nz\%WW  
  UpdateData(FALSE); xro  
} 7$/ O{GBJ  
k%.IIVRx  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) fRq2sK;+  
{ kELV]iWb  
 if(pMsg -> message == WM_KEYDOWN) ?z?IEj}  
 { OI1&Z4Lx  
  if(pMsg -> wParam == VK_ESCAPE) t\'URpa+5%  
   return TRUE; ?-Oy/Y K  
  if(pMsg -> wParam == VK_RETURN) 5B"j\TwQ  
   return TRUE; ( vgoG5  
 } BE:GB?XBH  
 return CDialog::PreTranslateMessage(pMsg); 8+lM6O ~!  
} <@JK;qm>S  
s%I) +|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3d \bB !  
{ |r6<DEg  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ X}_kLfP/9  
  SaveBmp(); &;*jMu6  
  return FALSE; eB5; wH  
} k;q|pQ[  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Xul<,U~w6  
 CMenu pop; zQ5'q  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); U Tw\_s  
 CMenu*pMenu=pop.GetSubMenu(0); ~6E `6;`  
 pMenu->SetDefaultItem(ID_EXITICON); #_|6yo}  
 CPoint pt; bT0CQ_g21  
 GetCursorPos(&pt); L`3 g5)V  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Fvl_5l  
 if(id==ID_EXITICON) D/Bb)]9I  
  DeleteIcon();  #6@7XC  
 else if(id==ID_EXIT) {&G0jsA  
  OnCancel(); l2._Z Py  
 return FALSE; mD=x3d  
} 1VH7z  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); O cd ^{u  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) #2/k^N4r  
 AddIcon(); uq{w1O5  
 return res; 1 1O^)_|c  
} 1iig0l6\m  
<`n T+c  
void CCaptureDlg::AddIcon() j l%27Ld  
{ a%V6RyT4qW  
 NOTIFYICONDATA data; y/Paq^Hd  
 data.cbSize=sizeof(NOTIFYICONDATA); P^T]Ubv"  
 CString tip; -n+ =[M  
 tip.LoadString(IDS_ICONTIP); eG=Hyc  
 data.hIcon=GetIcon(0); E2+O-;VN  
 data.hWnd=GetSafeHwnd(); gT?:zd=;  
 strcpy(data.szTip,tip); X\V1c$13CK  
 data.uCallbackMessage=IDM_SHELL; L >Y%$|4  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~*ST fyFw  
 data.uID=98; ]?-8[v~{C  
 Shell_NotifyIcon(NIM_ADD,&data); [,yoFm%"  
 ShowWindow(SW_HIDE); DTH;d-Z  
 bTray=TRUE; w<*6pP y  
} SI^!e1@M[  
l'y)L@|Qrh  
void CCaptureDlg::DeleteIcon() ?45bvkCT  
{  2tMe#V  
 NOTIFYICONDATA data; \mbm$E+X  
 data.cbSize=sizeof(NOTIFYICONDATA); sWa`-gc  
 data.hWnd=GetSafeHwnd(); ko2?q  
 data.uID=98; luY#l!mx3  
 Shell_NotifyIcon(NIM_DELETE,&data); XE6sFU  
 ShowWindow(SW_SHOW); j.= VZ  
 SetForegroundWindow(); \u9l4  
 ShowWindow(SW_SHOWNORMAL); ViKN|W >T  
 bTray=FALSE; fX^ <H_1$G  
} :6:;Z qn  
8{^zXJi]m  
void CCaptureDlg::OnChange()  dtTQY  
{ Pp#  
 RegisterHotkey(); qkPvE;"  
} =C gcRxng  
wxS.!9K  
BOOL CCaptureDlg::RegisterHotkey() >cpT_M&C,  
{ z.P<)[LUc  
 UpdateData(); IT!u4iH[  
 UCHAR mask=0; +" |?P  
 UCHAR key=0; z10J8Ms'  
 if(m_bControl) 'I^3r~_  
  mask|=4; aQzx^%B1  
 if(m_bAlt) BE>^;`K  
  mask|=2; # 3UrGom  
 if(m_bShift) 3k3-Ts  
  mask|=1; /Ps/m!  
  key=Key_Table[m_Key.GetCurSel()]; 8A'oK8Q  
 if(bRegistered){ @{n"/6t  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); @komb IK  
  bRegistered=FALSE; __LR!F]=i  
 } ( y0  
 cMask=mask; rr~O6Db  
 cKey=key; L6<.>\^Z"  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 40h  
 return bRegistered; w=JO$7  
} icS% ])3LF  
?V&# nA  
  四、小结 s3<gq x-&r  
OYW:I1K<5  
  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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