社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 7324阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 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: !9iVe7V  
  RW>Z~Nj  
  一、实现方法 5 +(YcV("  
v-G(bw3  
  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: X+ iA"B  
f$V']dOj1q  
#pragma data_seg("shareddata") g;]2'Rj  
HHOOK hHook =NULL; //钩子句柄 aDza"Ln  
UINT nHookCount =0; //挂接的程序数目 94nvh:n  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 m !;mEBL{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @ n;WVG  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ~n"V0!:'4  
static int KeyCount =0; a3Es7R+S  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 $ Qg81mu  
#pragma data_seg() mq'q@@:c  
6t]oSxN  
  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。 P'ZWAxd  
aKCCFHq t!  
  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: WlZ[9,:p1  
 ^r ;}6  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR o}WbW }&  
cKey,UCHAR cMask) 3L>V-RPiM  
{ aeUm,'Y$  
 BOOL bAdded=FALSE; uX}M0W  
 for(int index=0;index<MAX_KEY;index++){ by6E "7%  
  if(hCallWnd[index]==0){ `5e#9@/e  
   hCallWnd[index]=hWnd; NqqLRgMOR'  
   HotKey[index]=cKey; z8z U3?  
   HotKeyMask[index]=cMask;  |k 4+I  
   bAdded=TRUE; >>^c_0"O  
   KeyCount++; oF ,8j1  
   break; (:T~*7/"  
  } %_tL}m{?  
 } ,  PN?_N  
 return bAdded; 5-u=ZB%p  
} , st4K;-  
//删除热键 $#Ji=JX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u> >t"w  
{ 0HxF#SlKM  
 BOOL bRemoved=FALSE; -JwH^*Ad  
 for(int index=0;index<MAX_KEY;index++){ sOJ"~p  
  if(hCallWnd[index]==hWnd){ -QS_bQG%  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,rX!V=Z5  
    hCallWnd[index]=NULL; <B u*:O  
    HotKey[index]=0; $$qhX]^ ~  
    HotKeyMask[index]=0; J)g(Nw,O  
    bRemoved=TRUE; _5 y)m5I  
    KeyCount--; 3'&]v6|  
    break; 5@ ZD'  
   } X#eVw|  
  } p3^7Hr  
 } >{GC@Cw  
 return bRemoved; lBh {8a|2W  
} eW >k'ez  
OZt'ovY  
t]vX9vv+D  
  DLL中的钩子函数如下: I/^Lr_\  
?'_iqg3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) N pRC3^  
{ L7Skn-*tnA  
 BOOL bProcessed=FALSE; mbS &>  
 if(HC_ACTION==nCode) UhEJznfi  
 { &x=<>~Ag3  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ,hOJe=u46  
   switch(wParam) 7?hC t  
   {  ?on3z  
    case VK_MENU: b$gDFNa  
     MaskBits&=~ALTBIT; Uc9Uj  
     break; 6K<vyr40  
    case VK_CONTROL: j@9nX4Z  
     MaskBits&=~CTRLBIT; l_f"}l  
     break; H uE*jQ  
    case VK_SHIFT: >/'WU79TYE  
     MaskBits&=~SHIFTBIT; `C!Pe84(  
     break; @69q// #B  
    default: //judge the key and send message *Li;:b"t  
     break; QCtG #/  
   } T\c dtjk  
   for(int index=0;index<MAX_KEY;index++){ , H[o.r=  
    if(hCallWnd[index]==NULL) VJ1 `&  
     continue; u8[X\f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) has5"Bb  
    { msoE8YK&tg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); uNx3us-  
     bProcessed=TRUE; ^Y'>3o21f  
    } ((?^B  
   } ;wvV hQ  
  } O9>/ WmLe  
  else if((lParam&0xc000ffff)==1){ //有键按下 CF>NyY:_  
   switch(wParam) iWtWT1n8n  
   { kF\ QO [  
    case VK_MENU:  %gf8'Q  
     MaskBits|=ALTBIT; f'%}{l: ss  
     break; `,7BU??+u  
    case VK_CONTROL: cCj}{=U  
     MaskBits|=CTRLBIT; 8H{@0_M  
     break; *YDx6\><  
    case VK_SHIFT: }D|"$*  
     MaskBits|=SHIFTBIT; u(REEc~nj  
     break; ^rxXAc[  
    default: //judge the key and send message LL,~&5{  
     break; =n#xnZ3  
   } m Y%PG  
   for(int index=0;index<MAX_KEY;index++){ @P@t/  
    if(hCallWnd[index]==NULL) FNm8j#c~Q  
     continue; g\jdR_/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >eU;lru2Q  
    { Crey}A/N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 'vCFT(C-  
     bProcessed=TRUE; p6ZKyi  
    } lR-4"/1|y  
   } 8`*`4m  
  } ~i(*.Z) \  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 isDr|g$S  
   for(int index=0;index<MAX_KEY;index++){ sjzZl*GSy  
    if(hCallWnd[index]==NULL) nq$^}L3&~  
     continue; L:%h]-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 0,VbB7 z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); q&P"  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 :z^c<KFX  
   } "2Ye\#BU6  
  } m$$U%=r>@  
 } Li7/pUq>}!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); A).wjd(_,  
} jdoI)J@9H  
t(s']r  
  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: 5$9j&&R  
rgOB0[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2p'qp/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a Fl(K\  
EnfSVG8kB8  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: &{7%Vs TB  
W}T$Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [zY9"B<3  
{ =k&'ft  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) $)PNf'5Zg  
 { h],_1!0  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 = [:ruE  
  SaveBmp(); t/nu/yz5E  
  return FALSE; iXXgPapz  
 } PY) 74sa  
 …… //其它处理及默认处理 9v/1>rziE  
} ON !1lS  
eLl ;M4d  
RX#:27:  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 8vchLl#  
(Kx3:gs  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。   5)mn  
"|&SC0*  
  二、编程步骤 5 kQC  
sx|=*j,_  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ZfIQ Fh>  
g9 g &]  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; j1>1vD-`T  
T} U`?s`)  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ?HU(0Vgn'  
?n[+0a:8E  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; Y2Y/laD  
:5p`H  
  5、 添加代码,编译运行程序。 q?JP\_o:  
hXZk$a'  
三、程序代码 Xo$(zGb  
^F_c'  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 7eZ,; x  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 6J-tcL*4"%  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ~|+   
#if _MSC_VER > 1000 [_CIN  
#pragma once w 8T#~Dc  
#endif // _MSC_VER > 1000 91[(K'=&  
#ifndef __AFXWIN_H__ [9*+s  
#error include 'stdafx.h' before including this file for PCH @_0XK)pW  
#endif [?_^Cy  
#include "resource.h" // main symbols PYW~x@]k%,  
class CHookApp : public CWinApp 0(HUy`]>  
{ td{$ c6  
 public: 'V } -0  
  CHookApp(); Z+FJ cvYx  
  // Overrides [N.4 i" Cd  
  // ClassWizard generated virtual function overrides FzW7MW>\x  
  //{{AFX_VIRTUAL(CHookApp) b$%W<D  
 public: l2z@t3{  
  virtual BOOL InitInstance();  ig jr=e  
  virtual int ExitInstance(); G4]T  
  //}}AFX_VIRTUAL Qp]V~s(  
  //{{AFX_MSG(CHookApp) arRb q!mO  
  // NOTE - the ClassWizard will add and remove member functions here. 51l:  
  // DO NOT EDIT what you see in these blocks of generated code ! kwWDGA?zFB  
  //}}AFX_MSG AvH^9zEE(  
  DECLARE_MESSAGE_MAP() qy/xJ>:  
}; f D2. Zh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); UJ n3sZ<}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); PkMN@JS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `Z0FQ( r_  
BOOL InitHotkey(); K#tT \  
BOOL UnInit(); c7,p5[  
#endif Qne@Vf kA  
bRfac/:}  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ={B%qq  
#include "stdafx.h" 9J$N5  
#include "hook.h" 4Zo.c* BZ  
#include <windowsx.h> Wv8?G~>  
#ifdef _DEBUG KZ>cfv-&a  
#define new DEBUG_NEW =g UOHH  
#undef THIS_FILE RGf&KV/  
static char THIS_FILE[] = __FILE__; Z<@0~t_:?p  
#endif J>TNyVaoQ  
#define MAX_KEY 100  l|j  
#define CTRLBIT 0x04 /R!:ll2  
#define ALTBIT 0x02 Jx!#y A;  
#define SHIFTBIT 0x01 YZMSiDv[e  
#pragma data_seg("shareddata") xG/B$DLn  
HHOOK hHook =NULL; :Ugf3%sQ  
UINT nHookCount =0; kZ>_m &g  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ))66_bech  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT kc-=5l  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ,` 6O{Z~  
static int KeyCount =0; 2Jo|]>nl}u  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift kNR -eG  
#pragma data_seg() Qzt'ZK  
HINSTANCE hins; ~}pc&jz>q  
void VerifyWindow(); Y 3h`uLQ  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) _(l?gj  
//{{AFX_MSG_MAP(CHookApp) ?(0=+o(`  
// NOTE - the ClassWizard will add and remove mapping macros here. qILb>#  
// DO NOT EDIT what you see in these blocks of generated code!  k{d]  
//}}AFX_MSG_MAP JuQwZ]3ed  
END_MESSAGE_MAP() g[';1}/B4  
1-0tG+  
CHookApp::CHookApp() SMoJKr(:w#  
{ ' Dcj\=8  
 // TODO: add construction code here, Swa0TiT(  
 // Place all significant initialization in InitInstance Ql"kJ_F!br  
} )0+6^[Tqq  
0Q?)?8_  
CHookApp theApp; $>Qq 7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) g&z8t;@  
{ ,4:=n$e 0  
 BOOL bProcessed=FALSE; ' Dp;fEU$  
 if(HC_ACTION==nCode) '.EO+1{a  
 { % b fe_k(  
  if((lParam&0xc0000000)==0xc0000000){// Key up d^MRu#]  
   switch(wParam) J?{@pA  
   { _NefzZWUJ  
    case VK_MENU: :aQ.:b(n  
     MaskBits&=~ALTBIT; mC2K &'[  
     break; ~(nc<M[  
    case VK_CONTROL: =' uePM")  
     MaskBits&=~CTRLBIT; 7-:R{&3Lm:  
     break; .V4-  
    case VK_SHIFT: (Zg'])  
     MaskBits&=~SHIFTBIT; 0vX4v)-^u  
     break; xt_:R~/[  
    default: //judge the key and send message V6Mt;e)C  
     break; @`$'sU  
   } 6_,JW{#"  
   for(int index=0;index<MAX_KEY;index++){ 0civXZgj  
    if(hCallWnd[index]==NULL) Y<L35 ?  
     continue; w=pr?jt1:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'X<4";$mU  
    { m8@&-,T   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ] # VHx  
     bProcessed=TRUE; @A4$k dJ2  
    } @}=(4%  
   } hw$!LTB2  
  } d~1uK-L]*  
  else if((lParam&0xc000ffff)==1){ //Key down b9-IrR4h  
   switch(wParam) nr2 Q[9~  
   { _Jy7` 4B.  
    case VK_MENU: )fHr]#v  
     MaskBits|=ALTBIT; N=AHS  
     break; U% q-#^A  
    case VK_CONTROL: F+"_]  
     MaskBits|=CTRLBIT; }}"pQ!Z  
     break; h PL]B_<  
    case VK_SHIFT: }R`Rqg-W  
     MaskBits|=SHIFTBIT; |lt]9>|  
     break; ],_+J *  
    default: //judge the key and send message )/?H]o$NU  
     break; d]poUN~x  
   } h5SJVa  
   for(int index=0;index<MAX_KEY;index++) dgL>7X=7  
   { D/?Ec\ t  
    if(hCallWnd[index]==NULL) OvAhp&k  
     continue; +$|fUn{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W:,Wex^9n  
    { K>dB{w#gS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); om`T/@_,  
     bProcessed=TRUE; N0H=;CIQ  
    } V"m S$MN  
   } &\1n=y  
  } #l ZK_N|1x  
  if(!bProcessed){ N+'j on}U  
   for(int index=0;index<MAX_KEY;index++){ fqhL"Ah   
    if(hCallWnd[index]==NULL) P 0e-v0  
     continue; R*:>h8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [% C,&h5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); xNzGp5H  
   } I]^>>>p$  
  } GL=}Vu`(*  
 } /M_$4O;*@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $c9-Q+pZ  
} XEgJ7h_  
>~SS^I0  
BOOL InitHotkey() r/2= nE  
{ ZUHRATT-  
 if(hHook!=NULL){ 7~SwNt,  
  nHookCount++; 0?<#!  
  return TRUE; F}5d>nw  
 } 6Q^~O*cw  
 else +{1.kb Zq  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); I|U'@E  
  if(hHook!=NULL) .E<nQWz 8  
   nHookCount++; gxN>q4z  
  return (hHook!=NULL); 51SmoFbMz  
} X*QS/\  
BOOL UnInit() P.}d@qD{)  
{ J#zr50@@  
 if(nHookCount>1){ xSm;~')g  
  nHookCount--; ]1|P|Jp  
  return TRUE; hq)1YO  
 } d'RvpoM  
 BOOL unhooked = UnhookWindowsHookEx(hHook); D7;9D*o\  
 if(unhooked==TRUE){ $@D a|d4  
  nHookCount=0; 64<;6*  
  hHook=NULL; 8NWo)y49H  
 } Snx!^4+MF  
 return unhooked; a YWWln  
} $VuXr=f}  
s V_(9@b  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "j@\a)a  
{ 5&ku]l+  
 BOOL bAdded=FALSE; )h8}{*  
 for(int index=0;index<MAX_KEY;index++){ bC/":+s& p  
  if(hCallWnd[index]==0){ )th[fUC(  
   hCallWnd[index]=hWnd; Q?#I{l)V(  
   HotKey[index]=cKey; 2;8m0+tl  
   HotKeyMask[index]=cMask; uh )S;3|  
   bAdded=TRUE; 1^!SuAA@  
   KeyCount++; >Icr4?zq  
   break; TmsIyDcD~  
  } /|IPBU 5  
 } j*jUcD *  
 return bAdded; *.DC(2:o!  
} *yu}e)(0  
4J2^zx,H  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) cCe~Ol XQ  
{ {KG6#/%;  
 BOOL bRemoved=FALSE; >]\I:T  
 for(int index=0;index<MAX_KEY;index++){ ieFl4hh[G  
  if(hCallWnd[index]==hWnd){ o4);5~1l  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1~5DIU^  
    hCallWnd[index]=NULL; qN $t_  
    HotKey[index]=0; 0cd_l 2f#g  
    HotKeyMask[index]=0; ;mkkaW,D*  
    bRemoved=TRUE; x HRSzYn$  
    KeyCount--; bGPE0}b  
    break; l/&.HF  
   } LQ jbEYp  
  } d$zJLgkA  
 } eU[g@Pq:Y  
 return bRemoved; o*S_"  
} \^x{NV@v42  
xN1P#  
void VerifyWindow() O G`8::S  
{ ,/42^|=Z6O  
 for(int i=0;i<MAX_KEY;i++){ /Mqhx_)>A  
  if(hCallWnd!=NULL){ 9iA rBL"  
   if(!IsWindow(hCallWnd)){ K^Awf6%  
    hCallWnd=NULL; 0l!#u`cCI  
    HotKey=0; Cn{Hk)6  
    HotKeyMask=0; '5e,@t%y  
    KeyCount--; c3$T3Lu1  
   } mj~:MCC  
  } LeKovt%  
 } H@Dpht>[  
} "Ms;sdjg}&  
W>K^55'  
BOOL CHookApp::InitInstance() XKoY!Y\  
{ " kDiK`i  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); J2YQdCL  
 hins=AfxGetInstanceHandle(); z3o i(  
 InitHotkey(); 3k Ci5C  
 return CWinApp::InitInstance(); (l{vlFWd  
} '! [oLy  
*g/klK  
int CHookApp::ExitInstance() b;k+N`  
{ YW7W6mWspS  
 VerifyWindow(); =>jp\A  
 UnInit(); J:xGEa t  
 return CWinApp::ExitInstance(); yvAO"43  
} [q <'ty  
kv+%  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file sV\_DP/l  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) C]`uC^6g  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *l2`- gbE  
#if _MSC_VER > 1000 l/eF P  
#pragma once @~3--  
#endif // _MSC_VER > 1000 O$Rz/&  
p"g|]@m  
class CCaptureDlg : public CDialog ,eXtY}E  
{ S c)^k  
 // Construction 'xwCeZcg  
 public: bc)>h!'Y  
  BOOL bTray; 2hh8G5IaQ  
  BOOL bRegistered; iOE. .xA:  
  BOOL RegisterHotkey(); hXW` n*Zw  
  UCHAR cKey; /%wS5IZ^  
  UCHAR cMask; |Splbs k  
  void DeleteIcon(); %opBJ   
  void AddIcon(); xoaO=7\io  
  UINT nCount; +$2{u_m,  
  void SaveBmp(); S;|:ci<[=  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor /jbAf]"F;  
  // Dialog Data ?t#wK}d.  
  //{{AFX_DATA(CCaptureDlg) Ey6R/M)?:y  
  enum { IDD = IDD_CAPTURE_DIALOG }; !l:GrT8J  
  CComboBox m_Key; ;nY#/%f  
  BOOL m_bControl; =2Y;)wrF  
  BOOL m_bAlt; l$42MRi/  
  BOOL m_bShift; m,l/=M  
  CString m_Path; O%b byR2  
  CString m_Number; ajYe?z  
  //}}AFX_DATA 9T,/R1N8  
  // ClassWizard generated virtual function overrides .tBlGMcN  
  //{{AFX_VIRTUAL(CCaptureDlg) 0-. d{P  
 public: r*X,]\V0x  
  virtual BOOL PreTranslateMessage(MSG* pMsg);  Z>[7#;;  
 protected: 04a ^jjc  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support aSL`yuXu  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 1+l8%G=hB  
  //}}AFX_VIRTUAL rIyH/=;  
  // Implementation ;b~ S/   
 protected: PwY/VGT  
  HICON m_hIcon; 'ofj1%c  
  // Generated message map functions v^|U?  
  //{{AFX_MSG(CCaptureDlg) ,:_c-d#  
  virtual BOOL OnInitDialog(); jHLs 5%  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); D=tZ}_'{t  
  afx_msg void OnPaint(); &quY^j  
  afx_msg HCURSOR OnQueryDragIcon(); 4aW@c<-r?  
  virtual void OnCancel(); FpoH m%+  
  afx_msg void OnAbout(); ^t >mdxuq  
  afx_msg void OnBrowse(); *$f=`sj  
  afx_msg void OnChange(); Fq9YhR  
 //}}AFX_MSG _)A|JC!jId  
 DECLARE_MESSAGE_MAP() dcz?5O_{,  
}; \Mf>X\}  
#endif tvkdNMyX%9  
.`or^`X3  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file N& _~y|  
#include "stdafx.h" L/3A g* ]  
#include "Capture.h" .RD<]BxJ  
#include "CaptureDlg.h" =c8}^3L~7  
#include <windowsx.h> 7"(!]+BW!O  
#pragma comment(lib,"hook.lib") TBlSZZ-55]  
#ifdef _DEBUG tbrU>KCBD  
#define new DEBUG_NEW tgRj8 @  
#undef THIS_FILE o)`PS w=  
static char THIS_FILE[] = __FILE__; } ueFy<F  
#endif aDlp>p^E>  
#define IDM_SHELL WM_USER+1 Fs+ tcr/\[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O zAIz+`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4kOO3[r  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @gUp9ZwtH  
class CAboutDlg : public CDialog Na\ZV|;*tu  
{ j3-YZKpg  
 public: `Sod]bO +U  
  CAboutDlg(); 4u{S?Ryy  
  // Dialog Data Y&|Z*s+ +}  
  //{{AFX_DATA(CAboutDlg) 6FS%9.Ws  
  enum { IDD = IDD_ABOUTBOX }; kY0HP a  
  //}}AFX_DATA $|4@Zx4vf  
  // ClassWizard generated virtual function overrides [W[{ 4 Xu  
  //{{AFX_VIRTUAL(CAboutDlg) bS_#3T  
 protected: ~.a"jYb7A}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ggso9ZlLu+  
  //}}AFX_VIRTUAL WBe0^=x  
  // Implementation eJDZ| $  
 protected: z^Hc'oVXj:  
  //{{AFX_MSG(CAboutDlg) 0<M-asI?  
  //}}AFX_MSG W.wPy@yi  
  DECLARE_MESSAGE_MAP() $8EEtr,!  
}; @"w4R6l+*  
CH++3i2&  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) s!6lZ mPM  
{ (d9~z  
 //{{AFX_DATA_INIT(CAboutDlg) ' jciX]g  
 //}}AFX_DATA_INIT MK< y$B{}  
} ('J/Ww<  
o3WOp80hz  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ''17(%  
{ woI5aee|  
 CDialog::DoDataExchange(pDX); =H95?\}T[  
 //{{AFX_DATA_MAP(CAboutDlg) WtSs:D  
 //}}AFX_DATA_MAP K#"=*p,  
} ,p2UshOmd  
Q*M#e  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) T,38Pu@r  
 //{{AFX_MSG_MAP(CAboutDlg) kHM Jh~  
 // No message handlers ]m1fo'  
 //}}AFX_MSG_MAP UpoSC  
END_MESSAGE_MAP() -@Ap;,=  
GwWK'F'2  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) d0J /"<  
: CDialog(CCaptureDlg::IDD, pParent) %VHy?!/  
{ (leX` SN0u  
 //{{AFX_DATA_INIT(CCaptureDlg) @N'n>8Wn  
  m_bControl = FALSE; [9E~=A#  
  m_bAlt = FALSE; z8=THz2f  
  m_bShift = FALSE; vu0Ql1  
  m_Path = _T("c:\\"); zLJ>)v$81  
  m_Number = _T("0 picture captured."); iFIGJS  
  nCount=0; w\C1Bh!  
  bRegistered=FALSE; =vThtl/azD  
  bTray=FALSE; c[@_t.%)  
 //}}AFX_DATA_INIT {X,%GI  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 sG g458  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Bwg(f_[1  
} uHbg&eW  
v>X!/if<y  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) EEe$A?a;  
{ DYX{v`>f^  
 CDialog::DoDataExchange(pDX); .ARYCTyG  
 //{{AFX_DATA_MAP(CCaptureDlg) F`=p/IAJK  
  DDX_Control(pDX, IDC_KEY, m_Key); 0d2P   
  DDX_Check(pDX, IDC_CONTROL, m_bControl); (3e.q'  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ?<Qbp;WBo  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); q` S ~w  
  DDX_Text(pDX, IDC_PATH, m_Path); Y:*% [\R  
  DDX_Text(pDX, IDC_NUMBER, m_Number); EKc<|e,F  
 //}}AFX_DATA_MAP :s)cTq|3  
} If'q8G3]-  
}:$cK(|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ?;~!C2Zs  
//{{AFX_MSG_MAP(CCaptureDlg) N2:Hdu :  
 ON_WM_SYSCOMMAND() XJul~"  
 ON_WM_PAINT() T!/o^0w  
 ON_WM_QUERYDRAGICON() "LlpZtw  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) >Eh U{@Y  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) s.M39W?  
 ON_BN_CLICKED(ID_CHANGE, OnChange) O:BdZ5 b  
//}}AFX_MSG_MAP qI'pjTMDY  
END_MESSAGE_MAP() (Jp~=6&lKf  
Y7G sL7I  
BOOL CCaptureDlg::OnInitDialog() py6<QoGV  
{ a)|y0w)vV  
 CDialog::OnInitDialog(); 082}=Tsx   
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Xj, %t}  
 ASSERT(IDM_ABOUTBOX < 0xF000); *QK) 1Y1W  
 CMenu* pSysMenu = GetSystemMenu(FALSE); r3V1l8MV  
 if (pSysMenu != NULL) 5(~Lr3v0  
 { kBP?_ O  
  CString strAboutMenu; i)l0[FNI}  
  strAboutMenu.LoadString(IDS_ABOUTBOX); iXWzIb}CJ-  
  if (!strAboutMenu.IsEmpty()) pPL=(9d  
  { $S>'0mL  
   pSysMenu->AppendMenu(MF_SEPARATOR); V|Bwle  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); b'wy{~l@  
  } . 0dGS  
 } Bzz|2/1y  
 SetIcon(m_hIcon, TRUE); // Set big icon 3f =ZNJ>  
 SetIcon(m_hIcon, FALSE); // Set small icon |bk9< i ?  
 m_Key.SetCurSel(0); ~[=<O s  
 RegisterHotkey(); S1|5+PPs  
 CMenu* pMenu=GetSystemMenu(FALSE); $f@YQN=  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ?N4FB*x  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); .!q_jl%U  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); coCT]<  
 return TRUE; // return TRUE unless you set the focus to a control Na@bXcz)  
} Z?P^Y%ls  
jCY~Wc  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) NQD5=/o  
{ H&-3`<  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) c0wLc,)G  
 { !'_7MM  
  CAboutDlg dlgAbout; !B`z|#  
  dlgAbout.DoModal(); F{mUxo#T  
 } ;R= n<=Axa  
 else re*Zs}(N\  
 { sOqFEvzo1%  
  CDialog::OnSysCommand(nID, lParam); ^i@anbH  
 } S(@kdL  
} = #-zK:4  
>5O~SF.  
void CCaptureDlg::OnPaint() aOvqk ^  
{ *VsGa<V  
 if (IsIconic()) ,X!)zAmm  
 { aiPm.h>  
  CPaintDC dc(this); // device context for painting B}[CU='P*  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); =!-}q  
  // Center icon in client rectangle ge`GQ>  
  int cxIcon = GetSystemMetrics(SM_CXICON); 'p5M|h\:T  
  int cyIcon = GetSystemMetrics(SM_CYICON); &~2m@X(o  
  CRect rect; NL]_;\ h  
  GetClientRect(&rect); K/9Jx(I,qL  
  int x = (rect.Width() - cxIcon + 1) / 2; Cl '$*h  
  int y = (rect.Height() - cyIcon + 1) / 2; ]QlW{J  
  // Draw the icon *I :c@iCNJ  
  dc.DrawIcon(x, y, m_hIcon); 7V%P  
 } G:*vV#K  
 else OROvy  
 { $e1.y b%  
  CDialog::OnPaint(); 9(t(sP_  
 } ;6@sC[  
} HGAi2+&  
LqYyIbsvf  
HCURSOR CCaptureDlg::OnQueryDragIcon() Tdh(J",d  
{ {|>'(iqH"w  
 return (HCURSOR) m_hIcon; + yI$4MY  
} Muwlehuq  
@Ommd{0M  
void CCaptureDlg::OnCancel() # fqrZ9:@  
{ TG;[,oa  
 if(bTray) Q z(n41@`  
  DeleteIcon(); G,>YzjMY`  
  CDialog::OnCancel(); \k5"&]I3  
} {9(0s| pr  
Ma!  
void CCaptureDlg::OnAbout() (F^R9G|  
{ dC,C[7\  
 CAboutDlg dlg; 5r)8MklZ  
 dlg.DoModal(); LEM%B??&5z  
} a0hBF4+6  
='jT 5Mg  
void CCaptureDlg::OnBrowse() j^=Eu r/  
{ NWh1u`  
 CString str; frUs'j/bZ  
 BROWSEINFO bi; JPn)Op6  
 char name[MAX_PATH]; x^@oY5}cr  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); N!c FUZ5]  
 bi.hwndOwner=GetSafeHwnd(); e".=E ;o`  
 bi.pszDisplayName=name; F.U@8lr  
 bi.lpszTitle="Select folder"; $B8Vg `+  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ^?RH<z  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~1;M4K  
 if(idl==NULL) |8f}3R 9  
  return; 8#;=>m%  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); tC|?Kl7  
 str.ReleaseBuffer(); i.'"`pn_  
 m_Path=str; U',C-56z  
 if(str.GetAt(str.GetLength()-1)!='\\') msxt'-$M  
  m_Path+="\\"; 6yy%_+k*  
 UpdateData(FALSE); .v(GVkE}  
} wH8J?j"5>  
_cvX$(Sg  
void CCaptureDlg::SaveBmp() MrzD ah9UG  
{ T^Ia^B-%}g  
 CDC dc; )Zr\W3yWX  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL);  >SQzE  
 CBitmap bm; <oJ?J^  
 int Width=GetSystemMetrics(SM_CXSCREEN); tx7 zG.,  
 int Height=GetSystemMetrics(SM_CYSCREEN); 2*Qi4%s#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); /69yR   
 CDC tdc; RWv4/=}(G  
 tdc.CreateCompatibleDC(&dc); cW>=/  
 CBitmap*pOld=tdc.SelectObject(&bm); ef^GJTv&k  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); pMT7/y-  
 tdc.SelectObject(pOld); ~bkO8tn  
 BITMAP btm; vYm-$KQ"o  
 bm.GetBitmap(&btm); 1q(Qr h  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; .^*;hZ~4%  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); B!pz0K*uG  
 BITMAPINFOHEADER bih; zYV{ |Z  
 bih.biBitCount=btm.bmBitsPixel; 61Cc? a*_  
 bih.biClrImportant=0; 0?$|F0U"J  
 bih.biClrUsed=0; r'Wf4p^Xd  
 bih.biCompression=0; 3" m]A/6C}  
 bih.biHeight=btm.bmHeight; WYb}SI(E  
 bih.biPlanes=1; }Q4Vy  
 bih.biSize=sizeof(BITMAPINFOHEADER); ?|kbIZP(  
 bih.biSizeImage=size; V<#KFm$>C  
 bih.biWidth=btm.bmWidth; Hmr f\(x  
 bih.biXPelsPerMeter=0; lS9S7`  
 bih.biYPelsPerMeter=0; @=l6zd@  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ~(v5p"]dj  
 static int filecount=0; a%.W9=h=M(  
 CString name; 0e<>2AL   
 name.Format("pict%04d.bmp",filecount++); %d];h  
 name=m_Path+name; ~2\Sn-`  
 BITMAPFILEHEADER bfh; 8<"g&+T  
 bfh.bfReserved1=bfh.bfReserved2=0; ZeuL*c \  
 bfh.bfType=((WORD)('M'<< 8)|'B'); joskKik^  
 bfh.bfSize=54+size; W]/J]O6  
 bfh.bfOffBits=54; ;*Vnwt A  
 CFile bf; qdI%v#'M  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ :se$<d%  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 0F-{YQr>  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); l#enbQ`-~  
  bf.WriteHuge(lpData,size); peu9B gs  
  bf.Close(); />mK.FT  
  nCount++; "'bl)^+?,  
 } YA,~qT|  
 GlobalFreePtr(lpData); MrB#=3pT  
 if(nCount==1)  "x9yb0  
  m_Number.Format("%d picture captured.",nCount); z |llf7:  
 else 4 9N.P;b  
  m_Number.Format("%d pictures captured.",nCount); Lo'pNJH;$  
  UpdateData(FALSE); Oe1WnS 7(]  
} z(A[xN@/W<  
1W'Ai"DLw  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) SbGdcCB  
{ yn}Dj9(q  
 if(pMsg -> message == WM_KEYDOWN) H;4QuB'^  
 { T+nID@"36  
  if(pMsg -> wParam == VK_ESCAPE) =tD*,2]  
   return TRUE; nfF$h}<o+  
  if(pMsg -> wParam == VK_RETURN) avq$aq(3&  
   return TRUE; `sqr>QD  
 } 0#OyT'~V%  
 return CDialog::PreTranslateMessage(pMsg); <~5O-.G]  
} F:q4cfL6  
NH|I>vyN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _ cQ '3@  
{ is8i_FoD,n  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ `{:Nt#7  
  SaveBmp(); Ht;Rz*}  
  return FALSE; GIzB1cl:  
} Op-z"inw  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ )9"^ D  
 CMenu pop; ^'E^*R  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6}-No  
 CMenu*pMenu=pop.GetSubMenu(0); I;NW!"pU  
 pMenu->SetDefaultItem(ID_EXITICON); Ur#jJR@%3  
 CPoint pt; +Mq\3  
 GetCursorPos(&pt); P4Pc;8T@!  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); zEFS\nP}E  
 if(id==ID_EXITICON) ,e43m=KhK  
  DeleteIcon(); 'Wnh1|z  
 else if(id==ID_EXIT) $ 6mShp9(  
  OnCancel(); QUW`Yc  
 return FALSE; boEQI=!j\+  
} S?b&4\:  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); N_K9H1 r  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) F}So=Jz9h  
 AddIcon(); ) n O ^Ay  
 return res; }R<t=):  
} t9U6\ru  
V?S}%-a  
void CCaptureDlg::AddIcon() je^VJ&ac  
{ syB pF:`-W  
 NOTIFYICONDATA data; 1<'z)r4  
 data.cbSize=sizeof(NOTIFYICONDATA); # &.syD#  
 CString tip; T" {~mQ*  
 tip.LoadString(IDS_ICONTIP); kMCP .D45;  
 data.hIcon=GetIcon(0); :Q DkaA  
 data.hWnd=GetSafeHwnd(); AuQ|CXG-\  
 strcpy(data.szTip,tip); 4Y?2u  
 data.uCallbackMessage=IDM_SHELL; 5kw  K%  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ISC>]`  
 data.uID=98; L@GICW~  
 Shell_NotifyIcon(NIM_ADD,&data); LHA^uuBN}  
 ShowWindow(SW_HIDE); ij0I!ilG4  
 bTray=TRUE; g7]S  
} pYQSn.`V~  
#aL.E(%  
void CCaptureDlg::DeleteIcon() pRV.\*:c  
{ P^<3 Z)L  
 NOTIFYICONDATA data; 3%'`^<-V  
 data.cbSize=sizeof(NOTIFYICONDATA); e2 c'Wab  
 data.hWnd=GetSafeHwnd(); MS;^:t1`  
 data.uID=98; d]e36Dwk  
 Shell_NotifyIcon(NIM_DELETE,&data); <8 <P,  
 ShowWindow(SW_SHOW); KsOSPQDGE  
 SetForegroundWindow(); Zzjx; SF  
 ShowWindow(SW_SHOWNORMAL); ;)FvTm'"\.  
 bTray=FALSE; uSR%6=$  
} bs|gQZG  
zK~8@{l}_"  
void CCaptureDlg::OnChange() 3R< r[3WP  
{ w3,KqF  
 RegisterHotkey(); CmBP C jh  
} ^$P_B-C N  
:G 5p`;hGo  
BOOL CCaptureDlg::RegisterHotkey() K*j OrQf`  
{ DGGySO6=$e  
 UpdateData(); 5go)D+6s  
 UCHAR mask=0; I[&x-}w  
 UCHAR key=0; 8(4!x$,Z5  
 if(m_bControl) |iUF3s|?  
  mask|=4; 9ia&/BT7"z  
 if(m_bAlt) J.XkdGQ  
  mask|=2; ks. p)F>]  
 if(m_bShift) _m?i$5  
  mask|=1; &6CDIxH{  
  key=Key_Table[m_Key.GetCurSel()]; A[m?^vk q  
 if(bRegistered){ YaS!YrpI  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Q.$8>)  
  bRegistered=FALSE; L-E &m*%  
 } F}l3\uC]  
 cMask=mask; _'cB<9P  
 cKey=key; mH$`)i8  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Zuzwc[Z1  
 return bRegistered; xBxiBhqzF  
} L;:PeYPL  
k?7"r4Vc)S  
  四、小结 =Ya^PAj '}  
w&H>`l06  
  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。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
如果您提交过一次失败了,可以用”恢复数据”来恢复帖子内容
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八