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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: yN}<l%  
  MB.LHIo  
  一、实现方法 t{ridA}  
x1#6~283  
  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: )YLZ"@  
_p+q)#.W  
#pragma data_seg("shareddata") xz/G$7q7  
HHOOK hHook =NULL; //钩子句柄 mj2sbRiSR=  
UINT nHookCount =0; //挂接的程序数目  ck`$ `  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Oo%%f+  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 u,@x7a,z  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey XToYtdt2  
static int KeyCount =0; <,nd]a  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 7^h*rL9  
#pragma data_seg() D4+OWbf6  
[rhK2fr:i  
  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。 vRO`hGH  
*>j4tA{b@v  
  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: Tr HUM4  
n]wZ7z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR .-p?skm=a  
cKey,UCHAR cMask) j 2Jew  
{ y;LZX-Z-  
 BOOL bAdded=FALSE; ?kc,}/4  
 for(int index=0;index<MAX_KEY;index++){ A^ry|4`3(  
  if(hCallWnd[index]==0){ pkA(\0E8  
   hCallWnd[index]=hWnd; tpKQ$) ed  
   HotKey[index]=cKey; <UJ5n) }"\  
   HotKeyMask[index]=cMask; G9> 0w)r  
   bAdded=TRUE; O@KAh5EB  
   KeyCount++; A Rjox`  
   break; k%cT38V*  
  } FBI^}^#_  
 } a^9}ceu?   
 return bAdded; &R}2/Mt  
} /vFdhh  
//删除热键 `ve5>aw0_Y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4*+)D8  
{ X]%n#\t,]  
 BOOL bRemoved=FALSE; %|?PG i@5  
 for(int index=0;index<MAX_KEY;index++){ x$V[xX  
  if(hCallWnd[index]==hWnd){ /57)y_ \  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ q?Mmkh)g  
    hCallWnd[index]=NULL; If.hA}  
    HotKey[index]=0; cz*Z/5XH  
    HotKeyMask[index]=0; 7ZpU -':  
    bRemoved=TRUE; e p\a  
    KeyCount--; {UEZ:a  
    break; ?s{Pp  
   } 80O[pf*?  
  } @X0$X+]E*8  
 } H52] Zm  
 return bRemoved; 3sBu`R*hk  
} ;z^C\=om  
Ha/-v?E  
?bK^IHh  
  DLL中的钩子函数如下: W6uz G  
;(9q, )  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) kA<58 ,!  
{ Y- c_ 2 )  
 BOOL bProcessed=FALSE; C+c;UzbD  
 if(HC_ACTION==nCode) =wX(a  
 { W-@}q}A  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Y[ toN9,  
   switch(wParam) 1'[_J  
   {  tdB<  
    case VK_MENU: ?e!mv}B_  
     MaskBits&=~ALTBIT; ]W 6!Xw)[  
     break; n8>( m,  
    case VK_CONTROL: q:ZF6o`Z83  
     MaskBits&=~CTRLBIT; m]:|j[!*M  
     break; $[8GFv  
    case VK_SHIFT: @phb5  
     MaskBits&=~SHIFTBIT; BDT1qiC  
     break; |Orp:e!  
    default: //judge the key and send message [CJr8Qn  
     break; 41jx+ 0\Z  
   } (Puag*  
   for(int index=0;index<MAX_KEY;index++){ RI jz7ZG  
    if(hCallWnd[index]==NULL) -XtDGNH F  
     continue; (y!<^ Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F2RU7o'f.  
    { :Sd iG=t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?Dk&5d^d  
     bProcessed=TRUE; u >o2lvy8  
    } Mk@%Wuxg2  
   } E"$AOM?(*i  
  } 7LY4q/  
  else if((lParam&0xc000ffff)==1){ //有键按下 F%pYnHr<  
   switch(wParam) ril4*$e7^\  
   { zDO`w0N  
    case VK_MENU: WrNm:N  
     MaskBits|=ALTBIT; +\n8##oAI  
     break; d'Z  
    case VK_CONTROL: 7R`:^}'>  
     MaskBits|=CTRLBIT; fPW(hb;  
     break; &c)n\x*  
    case VK_SHIFT: _+hf.[""  
     MaskBits|=SHIFTBIT; (:]on^|  
     break; t LZ4<wc  
    default: //judge the key and send message  &(Ot(.  
     break; u*J,3o} <  
   } 1FiFP5  
   for(int index=0;index<MAX_KEY;index++){ K7H` Yt  
    if(hCallWnd[index]==NULL) (\<#fkeH  
     continue; CPCjY|w7   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .A`Q!  
    { Una7O]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =N%;HfUD  
     bProcessed=TRUE; ?tLBEoUmKT  
    } y9OxPq.Cy  
   } 0HRLTgIC  
  } `w J^   
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 P~y%  
   for(int index=0;index<MAX_KEY;index++){ o%E^41M7E  
    if(hCallWnd[index]==NULL) n2$(MDdL`  
     continue; Ht Z3n"2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) G 'sEbw'[  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); s<t*g]0`/  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 P=%' 2BQ{{  
   } b+.P4+  
  } !Z*2X ^  
 } ~;A36M-[.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); vf+GC*f  
} 2}P?N  
L`Lro:E?kL  
  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: OTNcNY  
1 \_S1ZS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5P'<X p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); I8C(z1(N  
U!rhj&n  
  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: ,s*-2Sz  
WZ a?Xb  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &cEQ6('H  
{ wua`e <"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Bu\:+3)  
 {  1 U|IN=  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 k%5 o5Hx  
  SaveBmp(); XUrxnJ4  
  return FALSE; `czL$tN<P  
 } cZ{-h  
 …… //其它处理及默认处理 M}]E,[  
} 4#oLf1  
ppjS|l*`  
4]F:QS% x  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 #&A)%Qbg  
%B&y^mZv*\  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 U=4tJb  
 ahno$[  
  二、编程步骤 3(De> gs$  
]\y:AkxhJ  
  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"; b'Scoa7@'  
tp-PE?  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ~9N n8g6  
gi|j ! m  
  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; 06FBI?;|=  
aB6F<"L,  
  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; >8$]g  
e^?0uVxS1  
  5、 添加代码,编译运行程序。 pDlU*&  
Ka|WT|1  
三、程序代码 Lb2bzZbhx  
K/+Y9JP9  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL =}6yMR!4R<  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 6tC0F=  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ y6 bl&_  
#if _MSC_VER > 1000 /T53"+7:0  
#pragma once OaeGukhX&  
#endif // _MSC_VER > 1000 ]chfa  
#ifndef __AFXWIN_H__ 8cV3VapF  
#error include 'stdafx.h' before including this file for PCH Flrpk`4  
#endif H B}!Lf#*P  
#include "resource.h" // main symbols .""?k[f5Q  
class CHookApp : public CWinApp $wgHaSni  
{ Sz.sX w;  
 public: |;XkU`G  
  CHookApp(); gr?[KD l~  
  // Overrides MCBZq\c  
  // ClassWizard generated virtual function overrides Dp)5u@I  
  //{{AFX_VIRTUAL(CHookApp) <6_RWtU  
 public: ^XsIQz[q  
  virtual BOOL InitInstance(); TC7Rw}jF  
  virtual int ExitInstance(); j:)"s_  
  //}}AFX_VIRTUAL MlDWK_y_&  
  //{{AFX_MSG(CHookApp) 0}a="`p#<  
  // NOTE - the ClassWizard will add and remove member functions here. >h?!6L- d  
  // DO NOT EDIT what you see in these blocks of generated code ! S${n:e0\  
  //}}AFX_MSG n&? --9r  
  DECLARE_MESSAGE_MAP() D<-MbK^S  
}; j06q3N"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 9~ [Sio~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >}& :y{z~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jF5Y-CX  
BOOL InitHotkey(); ^EK]z8;|  
BOOL UnInit(); (%&HufT  
#endif v{/z`J!JR  
A4lW8&rHI  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. C5q n(tv  
#include "stdafx.h" tVB9kxtE  
#include "hook.h" f-lM[\ma_  
#include <windowsx.h> IY Ilab\TZ  
#ifdef _DEBUG %r1NRg8  
#define new DEBUG_NEW f,Z* o  
#undef THIS_FILE qhFWQ1W  
static char THIS_FILE[] = __FILE__; `Bw>0%.  
#endif .c+NsI9}  
#define MAX_KEY 100 l :e&w(1H  
#define CTRLBIT 0x04 4'Svio  
#define ALTBIT 0x02 &:K!$W  
#define SHIFTBIT 0x01 2U;6sn*e  
#pragma data_seg("shareddata") O;bnyB$  
HHOOK hHook =NULL; _"b[U T}m  
UINT nHookCount =0; f6\`eLGi1  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey cym<uh-Wg^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT cPFs K*w  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey p_^Jr*Mv  
static int KeyCount =0; r#svj*dn  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 4f)B@A-  
#pragma data_seg() g4Y1*`}2f  
HINSTANCE hins; m?Tv8-1  
void VerifyWindow(); ljr?Z,R4  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) %25GplMT  
//{{AFX_MSG_MAP(CHookApp) d) i:-#Q  
// NOTE - the ClassWizard will add and remove mapping macros here. fVb~j;  
// DO NOT EDIT what you see in these blocks of generated code! >iZ"#1ZL2O  
//}}AFX_MSG_MAP [{}Hk%wlX  
END_MESSAGE_MAP() fD^$ y 8  
7gX#^YkE+k  
CHookApp::CHookApp() +v!% z(  
{ Zb p+b;  
 // TODO: add construction code here, RM\A$.5  
 // Place all significant initialization in InitInstance K{]9Yo  
} zWN<"[agc  
c#-o@`Po  
CHookApp theApp; v- 793pr  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) z( 00"ei  
{ >-%tvrS%  
 BOOL bProcessed=FALSE; zl a^j,  
 if(HC_ACTION==nCode) SauX C  
 { {WYJQKs8  
  if((lParam&0xc0000000)==0xc0000000){// Key up Mj9Mv<io  
   switch(wParam) (:g ZZG  
   { gK_^RE9~  
    case VK_MENU: ]~YY#I":  
     MaskBits&=~ALTBIT; F'~\!dNL  
     break; apz) 4%A  
    case VK_CONTROL: U=kP xe  
     MaskBits&=~CTRLBIT; e7n[NVrX  
     break; ? Zhnb0/  
    case VK_SHIFT: dH5 Go9`~R  
     MaskBits&=~SHIFTBIT; 4l2/eh]Hc(  
     break; H ~VeY\:w  
    default: //judge the key and send message bS1?I@  
     break; )#(6J  
   } >cTSX  
   for(int index=0;index<MAX_KEY;index++){ W@b Z~Q9  
    if(hCallWnd[index]==NULL) HX)oN8  
     continue; TJ_<21a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uZ1b_e0SGu  
    { |c<h& p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); bR\Oyd~e  
     bProcessed=TRUE; [}mx4i  
    } JZ l"k  
   } i9RAb tQ}  
  } (aeS+d x  
  else if((lParam&0xc000ffff)==1){ //Key down ro %Jg  
   switch(wParam) l;~b:[r  
   { s*g`| E{M  
    case VK_MENU: /h(bMbZ  
     MaskBits|=ALTBIT; iImy"$yX{  
     break; c :d.mkF\  
    case VK_CONTROL: hw @)W  
     MaskBits|=CTRLBIT; !l(O$T9 T  
     break; Bn4wr  
    case VK_SHIFT: z^FJ  
     MaskBits|=SHIFTBIT; D\4pLm"!v  
     break; ]jB`"to*}  
    default: //judge the key and send message u3G.xlHH[  
     break; )8Q;u8jm1  
   } : Yb_  
   for(int index=0;index<MAX_KEY;index++) -$A >b8  
   { 83i;:cn  
    if(hCallWnd[index]==NULL) ['%$vnS5S  
     continue; Q2)CbHSz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p=d,kY  
    { KHT RoXt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); (g*mC7 HN  
     bProcessed=TRUE; -U BH,U  
    } 2{6%+>jB  
   } -T8'|"g  
  } CZzgPId%x  
  if(!bProcessed){ 3+4U?~^k*  
   for(int index=0;index<MAX_KEY;index++){ G'<Ie@$6l  
    if(hCallWnd[index]==NULL) riu_^!"Z_  
     continue; ~p!=w#/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) !^x;4@Ejm  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); P-_2IZiz  
   } _qf$dGqc  
  } A=f)ntH~  
 } _g]h \3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); =e"RE/q2  
} z=j,-d%9  
!q[r_wL  
BOOL InitHotkey() TB%NHq-!  
{ :5#iVa#<  
 if(hHook!=NULL){ B;A< pNT  
  nHookCount++; C9j3|]nyL  
  return TRUE; kTfE*We9  
 } |I2~@RfpO:  
 else +Y_]<  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); <*@!>6mS  
  if(hHook!=NULL) n_/;j$h  
   nHookCount++; PN"=P2e/ 6  
  return (hHook!=NULL); -%_vb6u  
} KLpFW}  
BOOL UnInit() -\[&<o@/D  
{ 9zD,z+  
 if(nHookCount>1){ ,7n8_pU  
  nHookCount--; f~R`RBZ]9  
  return TRUE; [NU@A>H  
 } ,opS)C$  
 BOOL unhooked = UnhookWindowsHookEx(hHook); rNl%I@G  
 if(unhooked==TRUE){ }08Sv=XM  
  nHookCount=0; 68()2v4X  
  hHook=NULL; d9.I83SS  
 } (v0i]1ly[  
 return unhooked; eAK=ylF;  
} Yc-gJI*1  
6#;u6@+}yy  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7.nNz&UG]5  
{ l H{~?x  
 BOOL bAdded=FALSE; bNG7A[|B  
 for(int index=0;index<MAX_KEY;index++){ J] )gXVRM  
  if(hCallWnd[index]==0){ KP xf  
   hCallWnd[index]=hWnd; qM(@wFg  
   HotKey[index]=cKey; xxZO{_q  
   HotKeyMask[index]=cMask; XNr8,[c  
   bAdded=TRUE; 9`Y\`F#}q  
   KeyCount++; rebWXz7  
   break; ZRP[N)Ld$  
  } Y?4N%c_;  
 } 0/JTbf. CX  
 return bAdded; \y0]BH  
} G7YBo4v  
[N_)V kpr  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A,;[9J2\&  
{ tKCX0UZ'  
 BOOL bRemoved=FALSE; ;0nL1R]w(  
 for(int index=0;index<MAX_KEY;index++){ {q/D,Rh8  
  if(hCallWnd[index]==hWnd){ 0[92&:c,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ '"9Wt@ .  
    hCallWnd[index]=NULL; 0O|l7mCr%I  
    HotKey[index]=0; O6b.oS '-  
    HotKeyMask[index]=0; q\d/-K  
    bRemoved=TRUE; M!O &\2Q  
    KeyCount--; }UWi[UgA  
    break; '^`%  
   } | W<jN  
  } roNs~]6  
 } 5iZ;7 ?(  
 return bRemoved; ]DK.4\^  
} PX5U)  
|D~#9  
void VerifyWindow() D%h_V>#z  
{ !U~S7h}  
 for(int i=0;i<MAX_KEY;i++){ ADT8A."R[  
  if(hCallWnd!=NULL){ #RWmP$+#=  
   if(!IsWindow(hCallWnd)){ Jzj>=jWX@  
    hCallWnd=NULL; c{\x< AwO  
    HotKey=0; ;*>':-4  
    HotKeyMask=0; 7D=gAMPvJ  
    KeyCount--; im@c||  
   } S<Uv/pn  
  } xX\A& 9m  
 } c#T0n !}  
} Ht7v+lY90^  
%!V=noo  
BOOL CHookApp::InitInstance() g*$yUt  
{ jWGX :XB  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); wQrD(Dv(yA  
 hins=AfxGetInstanceHandle(); RO.bh#A$  
 InitHotkey(); !UX7R\qu|  
 return CWinApp::InitInstance(); FK,Jk04on  
} wbbr8WiU  
ZWy,NN1  
int CHookApp::ExitInstance() vU!<-T#  
{ $m0-IyXcv  
 VerifyWindow(); ntD8:%m  
 UnInit(); K~jN"ev  
 return CWinApp::ExitInstance(); E )%r}4u>  
} 4 moVS1  
Wf9K+my  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file OIrr'uNH  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) l~$Od jf  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ =>Dw ,+"  
#if _MSC_VER > 1000 h 7*#;j  
#pragma once F1b~S;lm  
#endif // _MSC_VER > 1000 !K/zFYl  
RRJN@|"  
class CCaptureDlg : public CDialog ^A;(#5A]7  
{ o;J_"' kP  
 // Construction I.'sK9\Zp  
 public: \++#adN:K  
  BOOL bTray; KL+,[M@ F  
  BOOL bRegistered; i`vgD<}  
  BOOL RegisterHotkey(); B{-+1f4  
  UCHAR cKey; }OLBEhGs  
  UCHAR cMask; .6y(ox|LL  
  void DeleteIcon(); x#TWZ;  
  void AddIcon(); m| k:wuzqK  
  UINT nCount; :t6.J  
  void SaveBmp(); /r mm@  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor !_LRuqQ?"  
  // Dialog Data D(^ |'1  
  //{{AFX_DATA(CCaptureDlg) ~e R6[;  
  enum { IDD = IDD_CAPTURE_DIALOG }; 5wGc"JHm  
  CComboBox m_Key; bcE%EQ  
  BOOL m_bControl; \&1Di\eL  
  BOOL m_bAlt; q@&.)sLPgO  
  BOOL m_bShift; UZ3oc[#D=]  
  CString m_Path; =]hPX  
  CString m_Number; =U<6TP]{  
  //}}AFX_DATA m/>z}d05h  
  // ClassWizard generated virtual function overrides XCku[?Ix  
  //{{AFX_VIRTUAL(CCaptureDlg) jBnvu@K"  
 public: x#&%lJT  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ]QK@zb}x  
 protected: xN]88L}Tn  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mp+lN:  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 62z"cFN  
  //}}AFX_VIRTUAL h]#bPb  
  // Implementation pxO ?:B  
 protected: sXm,y$ \m  
  HICON m_hIcon; <aEY=IF4  
  // Generated message map functions pm~uWXqxr=  
  //{{AFX_MSG(CCaptureDlg) Tq=OYJq5U  
  virtual BOOL OnInitDialog(); 4e5 5  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ^q ?xi5 w  
  afx_msg void OnPaint(); (vqI@fB';u  
  afx_msg HCURSOR OnQueryDragIcon(); ~pj/_@S@x  
  virtual void OnCancel(); lhLE)B2a2  
  afx_msg void OnAbout(); K/+w6d  
  afx_msg void OnBrowse(); %b(non*  
  afx_msg void OnChange(); {Tym#  
 //}}AFX_MSG }Qo:;&"3  
 DECLARE_MESSAGE_MAP() Dt p\ T|)  
}; iPoDesp  
#endif (>gAnebN L  
PgF7ug%,@C  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 1%,AU  
#include "stdafx.h" -jOCzp  
#include "Capture.h" >"q~9b A  
#include "CaptureDlg.h" :D!}jN/)  
#include <windowsx.h> tlz)V1L  
#pragma comment(lib,"hook.lib") K=mW`XXup  
#ifdef _DEBUG WQT;k0;T]  
#define new DEBUG_NEW _N&]w*ce  
#undef THIS_FILE 9x0Ao*D<t  
static char THIS_FILE[] = __FILE__; |6}:n,KA.  
#endif Sx%vJYH0  
#define IDM_SHELL WM_USER+1 Sxw%6Va]p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hWqI*xSaJ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); yhi6RDS  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 235wl  
class CAboutDlg : public CDialog X #!oG)or  
{ 47 _";g@X  
 public: ;'x\L<b/)  
  CAboutDlg(); EO[UezuU  
  // Dialog Data MGzuQrl{H  
  //{{AFX_DATA(CAboutDlg) (o5+9'y"9  
  enum { IDD = IDD_ABOUTBOX }; h#iFp9N  
  //}}AFX_DATA ZT;:Hxv0N  
  // ClassWizard generated virtual function overrides O-ZB4hN8  
  //{{AFX_VIRTUAL(CAboutDlg) R^=)Ucj  
 protected: (ON_(MN  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support j. L`@  
  //}}AFX_VIRTUAL D3+UV+&R/  
  // Implementation xRx8E;Q@h?  
 protected:  EL[N%M3  
  //{{AFX_MSG(CAboutDlg) 9 O/l{  
  //}}AFX_MSG p&%M=SzN  
  DECLARE_MESSAGE_MAP() DlXthRM  
}; :U7m@3czU  
P_f>a?OL:  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5wws8w  
{ ;f8$vW ];  
 //{{AFX_DATA_INIT(CAboutDlg) Rr'^l ]  
 //}}AFX_DATA_INIT _+\hDV>v  
} 5Se S^kJC  
iVKX *kqc  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ~!w()v n  
{ '"=Mw;p  
 CDialog::DoDataExchange(pDX); m%hUvG| i  
 //{{AFX_DATA_MAP(CAboutDlg) zkt+"P{az[  
 //}}AFX_DATA_MAP  #' =rv  
} ;|e6Qc9  
EFg s}BV_9  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ;uC +5g`  
 //{{AFX_MSG_MAP(CAboutDlg) +'NiuN  
 // No message handlers ;i2N`t2  
 //}}AFX_MSG_MAP nPj+mg  
END_MESSAGE_MAP() 8'(|1  
G 39  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Tmo+I4qoL  
: CDialog(CCaptureDlg::IDD, pParent) m j{ /'  
{ G1d!a6>  
 //{{AFX_DATA_INIT(CCaptureDlg) qOKC2WD  
  m_bControl = FALSE; ]eJjffx  
  m_bAlt = FALSE; DfCo=  
  m_bShift = FALSE; W*xz 0  
  m_Path = _T("c:\\"); nFn@Z'T$N  
  m_Number = _T("0 picture captured."); / !*gH1 s  
  nCount=0; wb>>bV+U  
  bRegistered=FALSE; 1z\>>N$7B  
  bTray=FALSE; *1L;%u| [  
 //}}AFX_DATA_INIT k-( hJ}N  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 N2"4dVV;  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); []{g9CO  
} bD[6) ITg  
Qhd~4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 7x%0 ^~/n  
{ %0PZZl5b  
 CDialog::DoDataExchange(pDX); Hset(-=X  
 //{{AFX_DATA_MAP(CCaptureDlg) H:ar&o#(  
  DDX_Control(pDX, IDC_KEY, m_Key); GA{Q6]B  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); qR~s&SC#  
  DDX_Check(pDX, IDC_ALT, m_bAlt); TT429  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); &S.zc@rN  
  DDX_Text(pDX, IDC_PATH, m_Path); eKL)jzC:  
  DDX_Text(pDX, IDC_NUMBER, m_Number); HgwL~vG  
 //}}AFX_DATA_MAP 5O9Oi:-!c  
} aQ ~  
c{Ax{-'R  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) L7jMpz&  
//{{AFX_MSG_MAP(CCaptureDlg) "-N)TIzLX  
 ON_WM_SYSCOMMAND() Xf.w( -  
 ON_WM_PAINT() 5@+8*Fdk  
 ON_WM_QUERYDRAGICON() UN&b]vg  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) f.gkGwNk  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) a$c7d~p$I  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ^ ,Bxq^'D  
//}}AFX_MSG_MAP &/7AW(?  
END_MESSAGE_MAP() "jVMk  
T x_n$ &  
BOOL CCaptureDlg::OnInitDialog() P]Z}% 8^O  
{ <dTo-P  
 CDialog::OnInitDialog(); Te"<.0~1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); n_@YKz;8  
 ASSERT(IDM_ABOUTBOX < 0xF000); uBk$zs  
 CMenu* pSysMenu = GetSystemMenu(FALSE); jZ< *XX  
 if (pSysMenu != NULL) BZqb o`9  
 { FU0&EO  
  CString strAboutMenu; lqOv_q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); %}G:R !4 d  
  if (!strAboutMenu.IsEmpty()) Q1Z;vzQfg  
  { _Y*: l7  
   pSysMenu->AppendMenu(MF_SEPARATOR); cI3uH1;#  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); z(^p@&r)F  
  } U~ SK 'R  
 } A+j~oR  
 SetIcon(m_hIcon, TRUE); // Set big icon AZ5c^c)  
 SetIcon(m_hIcon, FALSE); // Set small icon #Dx$KPD  
 m_Key.SetCurSel(0); EIl _QV6  
 RegisterHotkey(); O'deQq[  
 CMenu* pMenu=GetSystemMenu(FALSE); m=2TzLVv  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); SZ-%0z  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); l[ ^bo/  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Mg95us  
 return TRUE; // return TRUE unless you set the focus to a control 0Bn$C, -  
} MB\vgKY  
:Ke~b_$Uy-  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) xH\'gli/  
{ \O?#gW\tR  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) uJG^>B?`b  
 { LX j Tqp'  
  CAboutDlg dlgAbout; ?x]T &S{  
  dlgAbout.DoModal(); <;x+ ?j  
 } dL")E|\\k  
 else ~s{$&N  
 { oZ%t!Fl1  
  CDialog::OnSysCommand(nID, lParam); rQK2&37-,@  
 } c0Jf  
} u=#!je  
C,-V>bx g  
void CCaptureDlg::OnPaint() 1K,bmb xRt  
{ qO>BF/)a(  
 if (IsIconic()) 2:i`,  
 { *D]/V U  
  CPaintDC dc(this); // device context for painting kaUH#;c>_  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 4 !~JNO  
  // Center icon in client rectangle Lm'Ony^F  
  int cxIcon = GetSystemMetrics(SM_CXICON); &&[j/d}J  
  int cyIcon = GetSystemMetrics(SM_CYICON); q{c6DCc]\  
  CRect rect; \VPU)  
  GetClientRect(&rect); +(r8SnRX  
  int x = (rect.Width() - cxIcon + 1) / 2; uZId.+Rk  
  int y = (rect.Height() - cyIcon + 1) / 2; l4u`R(!n5  
  // Draw the icon -BACdX  
  dc.DrawIcon(x, y, m_hIcon); H"I|dK:  
 } u9m"{KnV  
 else <H)h+?&~d  
 { ,[+gE\z{{u  
  CDialog::OnPaint(); [m!\ZK  
 } kvSSz%R~  
} 05nG |  
? _[gs/i}  
HCURSOR CCaptureDlg::OnQueryDragIcon() rMpb  
{ )0PUK9  
 return (HCURSOR) m_hIcon; Aye!@RjM8  
} p%J,af  
V|xR`Q  
void CCaptureDlg::OnCancel() 0_qqBL.4  
{ 4jis\W}%L3  
 if(bTray) if:2sS9r  
  DeleteIcon(); X"8Jk 4y  
  CDialog::OnCancel(); EEn}Gw  
} )1J&tV*U  
!=cW+=1  
void CCaptureDlg::OnAbout() jbC7U9t7  
{ CbS9fc&  
 CAboutDlg dlg; O|%><I?I  
 dlg.DoModal(); |/ZpZ7  
} l[Ng8[R  
3j<] W  
void CCaptureDlg::OnBrowse() &{y- }[~  
{ ) #Y*]  
 CString str; Uh?SDay  
 BROWSEINFO bi; T -C2V$1  
 char name[MAX_PATH]; GIo&zPx  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 5x4JDaG2  
 bi.hwndOwner=GetSafeHwnd(); E+>Qpy  
 bi.pszDisplayName=name;  z{``v|K  
 bi.lpszTitle="Select folder"; "]5]"F4]  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ;2)@NH  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); t1g)Y|@d  
 if(idl==NULL) A(Ugam~}  
  return; J h M.P9  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ![U|2x   
 str.ReleaseBuffer(); bPOehvK/  
 m_Path=str; -`iZBC50  
 if(str.GetAt(str.GetLength()-1)!='\\')  5ah]E  
  m_Path+="\\"; }#'O b  
 UpdateData(FALSE); X!"ltNd  
} f]%$HfF @  
ph%/;?wY  
void CCaptureDlg::SaveBmp() /jeurCQ8#u  
{ ?8b?{`@V  
 CDC dc; `dn|n I2  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL);  U`IDZ{g  
 CBitmap bm; GvF~h0wMt  
 int Width=GetSystemMetrics(SM_CXSCREEN); &`pd&U{S*  
 int Height=GetSystemMetrics(SM_CYSCREEN); 8>6+]]O  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 0j7\.aaK  
 CDC tdc; :s$ rD  
 tdc.CreateCompatibleDC(&dc); 0z_e3H{P27  
 CBitmap*pOld=tdc.SelectObject(&bm); uUwwR(R  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); PRWS[2[yk  
 tdc.SelectObject(pOld); #r#UO  
 BITMAP btm; ^0ipM/Lg  
 bm.GetBitmap(&btm); ~F+{P4%`<  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; vUvIZa  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); aJOhji<b#L  
 BITMAPINFOHEADER bih; B Lw ssr.  
 bih.biBitCount=btm.bmBitsPixel; ZnI_<iFR*  
 bih.biClrImportant=0; { >bw:^F  
 bih.biClrUsed=0; FJp~8 x=  
 bih.biCompression=0; dilRL,  
 bih.biHeight=btm.bmHeight; \;.\g6zX  
 bih.biPlanes=1; +P6q wh\v  
 bih.biSize=sizeof(BITMAPINFOHEADER); t]2~aK<]  
 bih.biSizeImage=size; 4}!riWR   
 bih.biWidth=btm.bmWidth; ~*- eL.  
 bih.biXPelsPerMeter=0; E Rqr0>x  
 bih.biYPelsPerMeter=0; |.)oV;9  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); arrNx|y  
 static int filecount=0; JN$v=Ox{  
 CString name; 2j Oh~-LU  
 name.Format("pict%04d.bmp",filecount++); m/Q@-  
 name=m_Path+name; [- a2<E  
 BITMAPFILEHEADER bfh; Vqb4 MWW  
 bfh.bfReserved1=bfh.bfReserved2=0; g"FG7E&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); M`9qo8zCi  
 bfh.bfSize=54+size; O0i_h<T  
 bfh.bfOffBits=54; O3j:Y|N@F  
 CFile bf; U_wn/wcLS  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ m@u!frE,  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); cuB~A8H#}  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ~kD/dXt  
  bf.WriteHuge(lpData,size); u-qg9qXJb  
  bf.Close(); .Xc, Gq{  
  nCount++; kBS;SDl)  
 } z+@aQ@75  
 GlobalFreePtr(lpData); Tu?+pz`h  
 if(nCount==1) J3Qv|w [3Y  
  m_Number.Format("%d picture captured.",nCount); `kpX}cKK}  
 else (vB aem9  
  m_Number.Format("%d pictures captured.",nCount); 1j`-lD  
  UpdateData(FALSE); SsIy;l  
} C5CUMYU  
9gZMfP  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) r1\c{5Wt  
{ TUw^KSa  
 if(pMsg -> message == WM_KEYDOWN) u}\F9~W-{  
 { }/nbv;)  
  if(pMsg -> wParam == VK_ESCAPE) X};m\Bz  
   return TRUE; me_DONW  
  if(pMsg -> wParam == VK_RETURN) wc* 5s7_  
   return TRUE; j&6,%s-M`a  
 } mS p -  
 return CDialog::PreTranslateMessage(pMsg); *`mPPts}  
} zH0%; o}  
[ >O4hifq  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9z$]hl  
{ WS/^WxRY  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ n#uH^@#0  
  SaveBmp(); 3l_Ko %qS  
  return FALSE; `MA ee8u'  
} J*o :RnB  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ gbsRf&4h  
 CMenu pop; y>Zvose  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); K kP}z  
 CMenu*pMenu=pop.GetSubMenu(0); MUhC6s\F  
 pMenu->SetDefaultItem(ID_EXITICON); bZHuEh2w  
 CPoint pt; x|d Xa0=N_  
 GetCursorPos(&pt); !C * %,Ak  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); |R8=yO%(  
 if(id==ID_EXITICON) (~:k70V5  
  DeleteIcon(); *%l&'+   
 else if(id==ID_EXIT) zpV@{%VSj  
  OnCancel(); 9I0/KuZd O  
 return FALSE; :y==O4  
} ]sjYxe  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 9 yH95uaDF  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) #~3x^ 4Y  
 AddIcon(); M lgE-Lm  
 return res; 3UU]w`At  
} o,[~7N  
WMnR+?q  
void CCaptureDlg::AddIcon() S+py \z%  
{ t j&+HC  
 NOTIFYICONDATA data; :@jhe8'w  
 data.cbSize=sizeof(NOTIFYICONDATA); SweaE Rl  
 CString tip; LTj;e[  
 tip.LoadString(IDS_ICONTIP); fu?5gzT+b  
 data.hIcon=GetIcon(0); r=Z#"68$  
 data.hWnd=GetSafeHwnd(); Rp4EB:*  
 strcpy(data.szTip,tip); !%5ae82~3  
 data.uCallbackMessage=IDM_SHELL; X&o!xV -+  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; [t*m$0[:  
 data.uID=98; iDt^4=`  
 Shell_NotifyIcon(NIM_ADD,&data); +(0Fab8g  
 ShowWindow(SW_HIDE); 9r-]@6;  
 bTray=TRUE; TC[_Ip&  
} lTJ1]7)  
o90SXa&l/  
void CCaptureDlg::DeleteIcon() Qj5~ lX`W  
{ }ddwL  
 NOTIFYICONDATA data; xoF]r$sC8  
 data.cbSize=sizeof(NOTIFYICONDATA); !<H[h4g  
 data.hWnd=GetSafeHwnd(); !`q*{Ojx  
 data.uID=98; EF=.L{  
 Shell_NotifyIcon(NIM_DELETE,&data); ZZOBMF7  
 ShowWindow(SW_SHOW); v+U( #"  
 SetForegroundWindow(); Ev* b  
 ShowWindow(SW_SHOWNORMAL); ^29w @*  
 bTray=FALSE; O( G|fs  
} L@2%a'  
K-IXAdx  
void CCaptureDlg::OnChange() ^8$CpAK]M  
{ ]y3V ^W#  
 RegisterHotkey(); RmxgCe(2a  
} pW7vY)hj  
K&0op 4&  
BOOL CCaptureDlg::RegisterHotkey() [R CUP.  
{ Gc>bli<-  
 UpdateData(); x^Tjs<#  
 UCHAR mask=0; @GqPU,RO  
 UCHAR key=0; 1{4d)z UB  
 if(m_bControl) [Av#Z)R  
  mask|=4; fN~kd m.  
 if(m_bAlt) Mnyg:y*=  
  mask|=2; T0s7aw[zm  
 if(m_bShift) %^[45e  
  mask|=1; S>O fUrt  
  key=Key_Table[m_Key.GetCurSel()]; 0Ge*\Q  
 if(bRegistered){ ((^jyQ  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); !|_b}/  
  bRegistered=FALSE; SQ| pH"  
 } wLC!vX.S  
 cMask=mask; wH=  
 cKey=key; 4@OnMj{M  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask);  G7 >  
 return bRegistered; rs {e6  
} A!Zjcp|  
^I3cU'X  
  四、小结 ,Q4U<`ds!  
pA)!40kz  
  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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