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
  • 5315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: 4 PU@W o  
  )ytP$,r![S  
  一、实现方法 k@n L(2  
P&Xy6@%[Z  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: DSp~k)  
:c )R6=v  
#pragma data_seg("shareddata") UaQW<6+  
HHOOK hHook =NULL; //钩子句柄 z1tCSt}7f  
UINT nHookCount =0; //挂接的程序数目 VRY@}>W'  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 l_+q a6C*  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 xZV|QVY;  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey b!"qbC1  
static int KeyCount =0; r<P?F  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 &js$qgY  
#pragma data_seg() |6Iw\YU  
4{6,Sx  
  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。 o ?.VW/"  
XJS^{=/  
  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: _wW"Tn]  
$mf6!p4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR \sW>Y#9]  
cKey,UCHAR cMask) !@ AnwV]  
{ F<2gM#jLB  
 BOOL bAdded=FALSE; #q&N d2y  
 for(int index=0;index<MAX_KEY;index++){ k#mL4$]V5N  
  if(hCallWnd[index]==0){ 56NDU>j$  
   hCallWnd[index]=hWnd; k4:=y9`R}$  
   HotKey[index]=cKey; bsI?=lO  
   HotKeyMask[index]=cMask; YVz,P_\(m  
   bAdded=TRUE; { M[iYFg=  
   KeyCount++; B4m34)EOE  
   break; =PjdL3 2  
  } R \y qM;2  
 } S!JLy&@  
 return bAdded; 7eZwpg?K  
} Tn>L?  
//删除热键  @_WZZ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) md : Wx  
{ %5Elj<eHZ  
 BOOL bRemoved=FALSE; w/(2fU(  
 for(int index=0;index<MAX_KEY;index++){ Gh%dVP9B@P  
  if(hCallWnd[index]==hWnd){ ('=Q[ua7-(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ j zZEP4  
    hCallWnd[index]=NULL; nnd-d+$  
    HotKey[index]=0; y,<\d/YY@  
    HotKeyMask[index]=0; "*d%el\63  
    bRemoved=TRUE; \[B#dw#  
    KeyCount--; HXqG;Fds(  
    break; }Q,BI*}*  
   } s cd}{Y  
  } SvQj'5~<  
 } ^Ri ; vM  
 return bRemoved; A_J!VXq  
} T^Xum2Ec  
2)q$HUIX  
+]C|y ,r  
  DLL中的钩子函数如下: eE0nW+i  
\9:IL9~F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) _]+ \ B  
{ *zX^Sg-[  
 BOOL bProcessed=FALSE; s8r[U, }(  
 if(HC_ACTION==nCode) }\ya6Gi8  
 { 09Z\F^*$F  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 vFgnbWxG  
   switch(wParam) f+QDjJ?z  
   {  Jy]}'eE?pr  
    case VK_MENU: ^p\n/#B  
     MaskBits&=~ALTBIT; M>jk"*hA|  
     break; FJsg3D*@J  
    case VK_CONTROL: %w/:mH3FA  
     MaskBits&=~CTRLBIT; hBW,J$B  
     break; p;2NO&  
    case VK_SHIFT: [Ue"#w  
     MaskBits&=~SHIFTBIT; :&O6Y-/B  
     break; PV/hnVUl  
    default: //judge the key and send message &=-{adm  
     break; +C=^,B!,  
   } 1-pxM~Y  
   for(int index=0;index<MAX_KEY;index++){ KKwJ=za  
    if(hCallWnd[index]==NULL) ~\7peH%  
     continue; zids2/_*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) E-$N!KY  
    { "Za'K+4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3 DZ8-N S  
     bProcessed=TRUE; =G1 5 eZW  
    } >t $^U  
   } 0 |Rmb  
  } lXrAsm$  
  else if((lParam&0xc000ffff)==1){ //有键按下 sYyya:ykxT  
   switch(wParam) *U|2u+| F  
   { <%LN3T  
    case VK_MENU: Q$^Kf]pD  
     MaskBits|=ALTBIT; xJE26i  
     break; ~5_>$7L>  
    case VK_CONTROL: /p[lOg  
     MaskBits|=CTRLBIT; Sh o] ~)XX  
     break; :x_;-  
    case VK_SHIFT: 4VlQN$  
     MaskBits|=SHIFTBIT; zT _[pa)O`  
     break; 77zDHq=  
    default: //judge the key and send message )Yw m_f-N  
     break; X>s'_F?  
   } ! d" i  
   for(int index=0;index<MAX_KEY;index++){ :*E#w"$,j  
    if(hCallWnd[index]==NULL) !K_ ke h  
     continue; 7|pF (sb0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jb!15Vlt"  
    { @ u2 P&|:{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |(UkI?V  
     bProcessed=TRUE; c_.4~>qw  
    } w 8oIq*  
   } L t.Vo  
  } ;rJ/Diz!g  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ZS?4<lXF  
   for(int index=0;index<MAX_KEY;index++){ +Zi@+|"BCN  
    if(hCallWnd[index]==NULL) $pYT#_P!/  
     continue; '0E^th#u-0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /Es&~Fn  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); PQ`~qM:3st  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ;{Su:Ixg  
   } dW2Lvnh!>/  
  } dIRSgJ`  
 } ZNTOI]P&  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^ )[jBUT  
} ~z*A%vp6ER  
orr6._xw  
  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: ; Uf]-uS  
DM)%=C6<  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?Y#x`DMh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $tFmp)  
d"hW45L  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: "ll TVB  
xO` O$ie  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Oxhc!9F  
{ dQH9NsV7g  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) P[bj {lo  
 { XCU>b[Cj,  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 (cEjC`]  
  SaveBmp(); QGQ}I  
  return FALSE; ;chz};zY  
 } k_%"#  
 …… //其它处理及默认处理 d (8X?k.S  
} Y1h)0_0  
x5)YZ~5  
h`%}5})=  
  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。 h oL"K  
CYWL@<p,  
  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。 2<' 1m{  
BD (  
  二、编程步骤 @ wJ|vW_.  
bQu1L>c,Uw  
  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"; 2n8spLZYGY  
I w-3Z'hOX  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; %N }0,a0  
j6{9XIR o_  
  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; :")iS?l  
4! V--F  
  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; u!WjG@  
Yr9!</;T  
  5、 添加代码,编译运行程序。 {E+o+2L  
idh5neyL  
三、程序代码 } :8{z`4H  
vpl> 5%  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 3BWYSJ|  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) y&$v@]t1  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ xsIuPL#_  
#if _MSC_VER > 1000 XAf,k&f3  
#pragma once uzpW0(_i3a  
#endif // _MSC_VER > 1000 QCvz|)  
#ifndef __AFXWIN_H__ )cd5iE:FO  
#error include 'stdafx.h' before including this file for PCH JVgV,4 1  
#endif BYBf`F)4  
#include "resource.h" // main symbols Q-M"+HO  
class CHookApp : public CWinApp %qf ?_2v  
{ W8R"X~!V  
 public: _R?:?{r,  
  CHookApp(); ic_q<Y}  
  // Overrides LmQS;/:  
  // ClassWizard generated virtual function overrides Sx", Zb  
  //{{AFX_VIRTUAL(CHookApp) $8"G9r  
 public: ggn:DE "  
  virtual BOOL InitInstance(); a*gzVE7W#n  
  virtual int ExitInstance(); @3F4Lg6H|  
  //}}AFX_VIRTUAL -l# h^  
  //{{AFX_MSG(CHookApp) a J&)-ge  
  // NOTE - the ClassWizard will add and remove member functions here. 3Bk_4n  
  // DO NOT EDIT what you see in these blocks of generated code ! FV->226o%  
  //}}AFX_MSG #nOS7Q#uW  
  DECLARE_MESSAGE_MAP() }pzUHl>  
}; Fs,#d%4@%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ?UGA-^E1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bdUe,2Yin  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $ 3/G)/A  
BOOL InitHotkey(); Vo2{aK;  
BOOL UnInit(); 3RyB 0 n  
#endif  A/zZ%h  
Rt^~db  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. @1UC9}>  
#include "stdafx.h" ~Kr_[X:d5  
#include "hook.h" Nhnw'9  
#include <windowsx.h> );zLy?n  
#ifdef _DEBUG hkhk,bhI  
#define new DEBUG_NEW mDT"%I"4j  
#undef THIS_FILE <:rbK9MIl  
static char THIS_FILE[] = __FILE__; !b0ANIp  
#endif U)n+j}vi  
#define MAX_KEY 100 O*8 .kqlgt  
#define CTRLBIT 0x04 `Z 3p( G  
#define ALTBIT 0x02 A*r6  
#define SHIFTBIT 0x01 L\u6EMyV  
#pragma data_seg("shareddata") cU^Z=B  
HHOOK hHook =NULL; L&WhX3$u  
UINT nHookCount =0; p*_^JU(<p  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey u\9t+wi}<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT im6Rx=}E{  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey @FBlF$vG  
static int KeyCount =0; 3{wmKo|_X  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift XsVp7zk\  
#pragma data_seg() <lBY  
HINSTANCE hins; *)6:yn  
void VerifyWindow(); O~1vX9  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ).BZPyV<  
//{{AFX_MSG_MAP(CHookApp) ~$O.KF:  
// NOTE - the ClassWizard will add and remove mapping macros here. #:y h2y7a%  
// DO NOT EDIT what you see in these blocks of generated code! X?'v FC  
//}}AFX_MSG_MAP (rM-~h6g  
END_MESSAGE_MAP() }?0At<(d  
tTzPT<  
CHookApp::CHookApp() =/J{>S>(i  
{ ?=22@Q}g  
 // TODO: add construction code here, I}&`IUP  
 // Place all significant initialization in InitInstance 0"*!0s ~  
} rLU+-_  
Y30e7d* qr  
CHookApp theApp; E9]/sFA-]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "5+x6/9b  
{ q (?%$u.  
 BOOL bProcessed=FALSE; 0KQDw  
 if(HC_ACTION==nCode) 8hK\Ya:mP  
 { Z+qTMm  
  if((lParam&0xc0000000)==0xc0000000){// Key up + ~6Nq(kV  
   switch(wParam) 1m52vQSo3l  
   { jgfl|;I?pg  
    case VK_MENU: w*E0f?s  
     MaskBits&=~ALTBIT; Aw38T w  
     break; nsRZy0@$t  
    case VK_CONTROL: ws tH&^  
     MaskBits&=~CTRLBIT; R*v~jR/   
     break; Oc|`<^m  
    case VK_SHIFT: yt+"\d  
     MaskBits&=~SHIFTBIT;  t dl Y  
     break; <d$L}uQwg  
    default: //judge the key and send message a2{ nrGD  
     break; phT|w H  
   } /:YJ2AARY  
   for(int index=0;index<MAX_KEY;index++){ 9 2e?v8  
    if(hCallWnd[index]==NULL) Od?M4Ed(  
     continue; o:E_k#Fi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <K$X>&Ts  
    { ? x*Ve2+]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -t<8)9q(  
     bProcessed=TRUE; O[tOpf@s.  
    } ]Tb ?k+a  
   } Vh.9/$xQ  
  } JwkMRO  
  else if((lParam&0xc000ffff)==1){ //Key down 7(q EHZEr  
   switch(wParam) ymIjm0jVh  
   { LV^V`m0#  
    case VK_MENU: zSpL^:~  
     MaskBits|=ALTBIT; MS Ml  
     break; ?\ qfuA9.  
    case VK_CONTROL: 'q#$^ ='o  
     MaskBits|=CTRLBIT; j"8f,er  
     break; @dy<=bh~  
    case VK_SHIFT: _* xjG \!  
     MaskBits|=SHIFTBIT; tKnvNOhn  
     break; ,}("es\b  
    default: //judge the key and send message x"n!nT%Z  
     break; aetK<9L$  
   } A@-A_=a,  
   for(int index=0;index<MAX_KEY;index++) YkPc&&#  
   { Ly?%RmHK  
    if(hCallWnd[index]==NULL) (Hr_gkGtM  
     continue; Mn- f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Qj?qWVapA  
    { -FAAP&LG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Auq)  
     bProcessed=TRUE; 0X`sQNx  
    } }\9elVt'2  
   } "kE$2Kg  
  } \Bg;^6U  
  if(!bProcessed){ ),G?f {`!  
   for(int index=0;index<MAX_KEY;index++){ Q\P?[i]  
    if(hCallWnd[index]==NULL) 'w'P rM,:  
     continue; (5^bU<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6vx0F?>_  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); +YL9gNN>P  
   } ZQZBap"  
  } =~OH.=9\  
 } NA%(ZRSg(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Z*Sa%yf  
} SMMV$;O{9  
DrG9Kky{  
BOOL InitHotkey() X&B2&e;  
{ $_j\b4]%  
 if(hHook!=NULL){ qdlz#-B  
  nHookCount++; .,)C^hs@  
  return TRUE; .pP{;:Avpn  
 } mSw$? >  
 else l>KkK|!T^i  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Fq]ht*  
  if(hHook!=NULL) }b// oe7  
   nHookCount++; )FNvtLZ  
  return (hHook!=NULL); '7+e!>"  
} /[[_}\xI%  
BOOL UnInit() rmX'Ym9#  
{ ]BY^.!Y  
 if(nHookCount>1){ #cN0ciCT'  
  nHookCount--; 7e{w)m:A  
  return TRUE; 5hVp2 w-  
 } GI&XL'K&  
 BOOL unhooked = UnhookWindowsHookEx(hHook); \S[7-:Lu^  
 if(unhooked==TRUE){ E>/kNl  
  nHookCount=0; .L,xqd[zC  
  hHook=NULL; 0 i76(2  
 } 7J 0=HbH  
 return unhooked; @Axwj   
} `zr%+  
r%M.rYLG{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) mkA1Sh{hX>  
{ RXMzwk  
 BOOL bAdded=FALSE; u7rA8u|TO  
 for(int index=0;index<MAX_KEY;index++){ aoLYw 9  
  if(hCallWnd[index]==0){ XZ@;Tyn0,  
   hCallWnd[index]=hWnd; lJ+05\pE  
   HotKey[index]=cKey; P/BWFN1  
   HotKeyMask[index]=cMask; e<Hbm  
   bAdded=TRUE; ;.=ZwM]C  
   KeyCount++; (+@ Lnz\  
   break; r<Il;?S6  
  } we6kV-L.  
 } n=HId:XT  
 return bAdded; `Qf$]Eoft  
} "bO\Wt#Mf  
y^7ol;t  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {Vc%ga|E  
{ fl{wF@C6  
 BOOL bRemoved=FALSE; o gcEv>0  
 for(int index=0;index<MAX_KEY;index++){ !"*!du28jo  
  if(hCallWnd[index]==hWnd){ 54TW8y `h  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ k{*IR  
    hCallWnd[index]=NULL; 2v ^bd^]u:  
    HotKey[index]=0; EhEUkZE3 )  
    HotKeyMask[index]=0; &<!DNXQ  
    bRemoved=TRUE; <,U=w[cH  
    KeyCount--; 9y BENvq  
    break; /~w!7n<7  
   } fS08q9,S/  
  } '8.r   
 } >900I4]I  
 return bRemoved; Cu5fp.OS7  
} 5r=xhOe`  
vvJ{fi  
void VerifyWindow() s "KPTV  
{ ^CIO,I  
 for(int i=0;i<MAX_KEY;i++){ 2$>"4 N  
  if(hCallWnd!=NULL){ 8 |>$M  
   if(!IsWindow(hCallWnd)){ :r?gD2q  
    hCallWnd=NULL; _ >)+ u  
    HotKey=0; P\;L#2n  
    HotKeyMask=0; L5%t.7B  
    KeyCount--; 7H$0NMP  
   } TU6e,G|t  
  } ^;";fr Vw  
 } 4)L(41h  
} nXgnlb=  
Vy]y73~  
BOOL CHookApp::InitInstance() +T*=JHOD  
{ /S32)=(  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 'j^A87\M_  
 hins=AfxGetInstanceHandle(); up[9L|  
 InitHotkey(); z 6~cm6j  
 return CWinApp::InitInstance(); .}.?b  
} p2]@yE7w  
fj2pD Cic  
int CHookApp::ExitInstance() /}G+PUk7  
{ a;=)`  
 VerifyWindow(); d~bZOy  
 UnInit(); XLEEd?Vct9  
 return CWinApp::ExitInstance(); {!? @u?M  
} !N\<QRb\q  
_zAHN0d  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file R+'$V$g\X  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) w! J|KM  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ET]PF,`  
#if _MSC_VER > 1000 6OBe^/ZRt  
#pragma once d~i WV6Va  
#endif // _MSC_VER > 1000 Vu @2  
&`#k 1t'  
class CCaptureDlg : public CDialog VrV )qfG  
{ -^ )0c  
 // Construction y v6V1gK  
 public: ws"{Y+L  
  BOOL bTray; ~}uv4;0l]  
  BOOL bRegistered; D?+\"lI  
  BOOL RegisterHotkey(); ~SI`%^L  
  UCHAR cKey; !VaKq_W  
  UCHAR cMask; 'q158x  
  void DeleteIcon(); F.zx]][JV  
  void AddIcon(); _|f1q  
  UINT nCount; 4 &r5M  
  void SaveBmp(); K U 2LJ_~Y  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor )?5027^  
  // Dialog Data kEQ1&9  
  //{{AFX_DATA(CCaptureDlg) _?j66-( Q  
  enum { IDD = IDD_CAPTURE_DIALOG }; vNMndo!  
  CComboBox m_Key; U3Fa.bC6}  
  BOOL m_bControl; vrRbUwL!  
  BOOL m_bAlt; 8Ld`$_E  
  BOOL m_bShift; j -l#n&M  
  CString m_Path; 9Fo00"q  
  CString m_Number; L1'PQV  
  //}}AFX_DATA ;^XF;zpg  
  // ClassWizard generated virtual function overrides T1$fu(f  
  //{{AFX_VIRTUAL(CCaptureDlg) BZS%p  
 public: |l4tR  
  virtual BOOL PreTranslateMessage(MSG* pMsg); K|i:tHF]@  
 protected: V=$ pXpro%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support st- z>}  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); hv)>HU&  
  //}}AFX_VIRTUAL w}8 ,ICL  
  // Implementation [/h3HyZ.  
 protected: 9v\x&h  
  HICON m_hIcon; ew13qpt)<L  
  // Generated message map functions x)35}mi){L  
  //{{AFX_MSG(CCaptureDlg) (`W_ -PI  
  virtual BOOL OnInitDialog(); 7a$K@iWU  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); vbt0G-%Z  
  afx_msg void OnPaint(); <x QvS^|[  
  afx_msg HCURSOR OnQueryDragIcon(); zKh^BwhO|X  
  virtual void OnCancel(); i-.]onR  
  afx_msg void OnAbout(); myq@X(K  
  afx_msg void OnBrowse(); s$%t*T2J>  
  afx_msg void OnChange(); Ro}7ERA  
 //}}AFX_MSG ~]sj.>P  
 DECLARE_MESSAGE_MAP() nt 9LBea  
}; )b%t4~7  
#endif Lud[.>i  
f ZEyXb  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file A-n@:` n~  
#include "stdafx.h"  Mi>!  
#include "Capture.h"  lu_kir~  
#include "CaptureDlg.h" gxKL yZO!  
#include <windowsx.h> :Dt]sE _d  
#pragma comment(lib,"hook.lib") [b2KBww\  
#ifdef _DEBUG .uh>S!X, ]  
#define new DEBUG_NEW ,6J{-Iu  
#undef THIS_FILE CP]nk0  
static char THIS_FILE[] = __FILE__; 0W_olnZ  
#endif ~FP4JM,y6  
#define IDM_SHELL WM_USER+1 Kw%to9 eh)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .OyzM  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c-GS:'J{  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :P2{^0$  
class CAboutDlg : public CDialog :VkuK@Th`  
{ ;[qA?<GJ  
 public: <?2g\+{s9  
  CAboutDlg(); v}cTS@0  
  // Dialog Data _p^?_  
  //{{AFX_DATA(CAboutDlg) >(?}'pS8  
  enum { IDD = IDD_ABOUTBOX }; !W\za0p  
  //}}AFX_DATA o+],L_Ab  
  // ClassWizard generated virtual function overrides k)3b0T@b  
  //{{AFX_VIRTUAL(CAboutDlg) &@v&5EXOw  
 protected: R|@?6<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support yG' 5:  
  //}}AFX_VIRTUAL < `Xt?K  
  // Implementation ^P!(* k#T  
 protected:  JT,[;  
  //{{AFX_MSG(CAboutDlg) ;s$,}O.  
  //}}AFX_MSG 9ZD>_a  
  DECLARE_MESSAGE_MAP() +^6a$ N  
}; MJ\^i4  
euMJ c  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #Dz. 58A  
{ r"_U-w  
 //{{AFX_DATA_INIT(CAboutDlg) ^g'P H{68  
 //}}AFX_DATA_INIT 5i0vli /L  
} ]/#3 P  
yI{4h $c  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) XLgp.w;  
{ N,3 )`Vm  
 CDialog::DoDataExchange(pDX); DqJzsk'd3  
 //{{AFX_DATA_MAP(CAboutDlg) "C]v   
 //}}AFX_DATA_MAP qo*%S  
} B*@0l:  
S4Q fx6:~h  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) UfkQG`G9H  
 //{{AFX_MSG_MAP(CAboutDlg) Hk 0RT%PK  
 // No message handlers {3* Ne /  
 //}}AFX_MSG_MAP 8{- *Q(=/  
END_MESSAGE_MAP() <WiyM[ ep  
D7lRZb  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) TWeup6k  
: CDialog(CCaptureDlg::IDD, pParent) H5eGl|Z5]^  
{ H3xMoSs  
 //{{AFX_DATA_INIT(CCaptureDlg) O`^dy7>{U  
  m_bControl = FALSE; vNDf1B5z  
  m_bAlt = FALSE; D_Zt:tzO  
  m_bShift = FALSE; ,%T sfB  
  m_Path = _T("c:\\"); 4[lym,8C  
  m_Number = _T("0 picture captured."); Xk(p:^ R  
  nCount=0; YlC$L$%Zd.  
  bRegistered=FALSE; l9Av@|  
  bTray=FALSE; [*K.9}+G_  
 //}}AFX_DATA_INIT ?:Sqh1-z  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 K^Ho%_)  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); PJ))p6 9  
} 3P*[ !KI  
[9C{\t  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) X|'[\v2ld  
{ 8U)*kmq  
 CDialog::DoDataExchange(pDX); .[:y`PCF  
 //{{AFX_DATA_MAP(CCaptureDlg) 5v[2R.eT-  
  DDX_Control(pDX, IDC_KEY, m_Key); nIqNhJ+  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ts/Ha*h  
  DDX_Check(pDX, IDC_ALT, m_bAlt); [gIvB<Uv  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); <{cf'"O7)  
  DDX_Text(pDX, IDC_PATH, m_Path); nu `R(2/  
  DDX_Text(pDX, IDC_NUMBER, m_Number); L2Fi/UWM  
 //}}AFX_DATA_MAP B!x7oD9  
} 5h l!zA?  
#|QA_5  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) j a'_syn  
//{{AFX_MSG_MAP(CCaptureDlg) <u}[_  
 ON_WM_SYSCOMMAND() E#~J"9k98  
 ON_WM_PAINT() Ly-}HW(  
 ON_WM_QUERYDRAGICON() AIG5a$}&  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) gX~lYdA  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ?&JK q^9\I  
 ON_BN_CLICKED(ID_CHANGE, OnChange) `sLD>@m  
//}}AFX_MSG_MAP S=a>rnF  
END_MESSAGE_MAP() &9ERlZ(A  
BC)1FxsGf  
BOOL CCaptureDlg::OnInitDialog() bMB@${i}  
{ ?$6(@>`f&t  
 CDialog::OnInitDialog(); ] 1s6=  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Xd@ d$  
 ASSERT(IDM_ABOUTBOX < 0xF000); v[4-?7-  
 CMenu* pSysMenu = GetSystemMenu(FALSE); G.~Ffk  
 if (pSysMenu != NULL) SQ057V>'=  
 { ,R}9n@JI^Y  
  CString strAboutMenu; ncpNesB  
  strAboutMenu.LoadString(IDS_ABOUTBOX); wz{&0-md*'  
  if (!strAboutMenu.IsEmpty()) S@ @#L  
  { 8^pu C  
   pSysMenu->AppendMenu(MF_SEPARATOR); 2f5YkmGc";  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); f&I5bPS7}  
  } }BWT21'-Y  
 } #'5{ ?Cb  
 SetIcon(m_hIcon, TRUE); // Set big icon 629ogJo8  
 SetIcon(m_hIcon, FALSE); // Set small icon &3|l4R\  
 m_Key.SetCurSel(0); 6f^IAa|  
 RegisterHotkey(); ?h:xO\h8  
 CMenu* pMenu=GetSystemMenu(FALSE); |~B`[p]5H  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); hz+c]K  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S|O#KE  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ap<r )<u  
 return TRUE; // return TRUE unless you set the focus to a control D$Ao-6QE W  
} 0D/7X9xg9+  
g~XR#vl$  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |qf ef &  
{ GK[9Cm"v  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) pB0 SCS*  
 { OCu/w1 bc  
  CAboutDlg dlgAbout; g f<vQb|  
  dlgAbout.DoModal(); C$d b) 5-  
 } 1fTf+P  
 else ;NF:98  
 { G5NAwpZf  
  CDialog::OnSysCommand(nID, lParam); )T@?.J`  
 } qb$M.-\ne  
} $U"pdf  
W)AfXy  
void CCaptureDlg::OnPaint() :)F0~Q  
{ 8(]q/g"O  
 if (IsIconic()) i7mo89S  
 { QsBC[7<jd-  
  CPaintDC dc(this); // device context for painting T~ P<Gq} ,  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); IM_SZs  
  // Center icon in client rectangle M%OUkcWCk  
  int cxIcon = GetSystemMetrics(SM_CXICON); ZyV^d3F@$  
  int cyIcon = GetSystemMetrics(SM_CYICON); 13A~."b  
  CRect rect; jd.w7.8  
  GetClientRect(&rect); rQ(u@u;  
  int x = (rect.Width() - cxIcon + 1) / 2; C[CNJ66  
  int y = (rect.Height() - cyIcon + 1) / 2; $ve*j=p  
  // Draw the icon ft$!u-`  
  dc.DrawIcon(x, y, m_hIcon); A]MX^eY  
 } M4e8PRlI  
 else z8j7K'vV1  
 { PnH5[4&k  
  CDialog::OnPaint(); L-Mf{z  
 } |Y30B,=M  
} ^nLk{<D35  
~&WBA]w'+  
HCURSOR CCaptureDlg::OnQueryDragIcon() *9US>mVy  
{ |=[. _VH1  
 return (HCURSOR) m_hIcon; @xr}(.  
} jP.dQj^j&  
=3=8oFx8  
void CCaptureDlg::OnCancel() C_&ZQlgQ  
{ K@?K4o   
 if(bTray) {a,U{YJ\H  
  DeleteIcon(); 1aezlDc*  
  CDialog::OnCancel(); U.1&'U*  
} %>1C ($^  
4JL]?75  
void CCaptureDlg::OnAbout() UYGO|lkEU  
{ k/i&e~! \  
 CAboutDlg dlg; M %!O)r#Pn  
 dlg.DoModal(); 9O\yIL  
} /d> Jkv  
dB8 e  
void CCaptureDlg::OnBrowse() @&GY5<&b  
{ #e[igxwi  
 CString str; Jm 1n|f  
 BROWSEINFO bi; HMw}pp:  
 char name[MAX_PATH]; w$aejz`[  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); QG5 c>Q  
 bi.hwndOwner=GetSafeHwnd(); ,7;euV5X  
 bi.pszDisplayName=name; Wf =hFc1_@  
 bi.lpszTitle="Select folder"; }^`5$HEi  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; EJ(z]M`f  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); NW` Mc&  
 if(idl==NULL) REPI >-|  
  return; s qO$ka{  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ,vB nr_D#  
 str.ReleaseBuffer(); :M.]-+(  
 m_Path=str; v V>=Uvm  
 if(str.GetAt(str.GetLength()-1)!='\\') I=;=;-  
  m_Path+="\\"; ufN`=IJ%  
 UpdateData(FALSE); x5k6"S"1,  
} `82^!7!  
"YN6o_*]  
void CCaptureDlg::SaveBmp() $ Zj3#l:rK  
{ Wqe0m_7  
 CDC dc; w}?,N  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); fz%e?@>q  
 CBitmap bm; 9 xFX"_J  
 int Width=GetSystemMetrics(SM_CXSCREEN); AbB+<0  
 int Height=GetSystemMetrics(SM_CYSCREEN); [6%y RQ_  
 bm.CreateCompatibleBitmap(&dc,Width,Height); G;]zX<2^3  
 CDC tdc; !*}E  
 tdc.CreateCompatibleDC(&dc); >[g.8'hI  
 CBitmap*pOld=tdc.SelectObject(&bm); nX<yB9bXDg  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Ll`nO;h  
 tdc.SelectObject(pOld); ew,g'$drD  
 BITMAP btm; Wv30;7~  
 bm.GetBitmap(&btm); nbBox,zW  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; =_[Ich,}  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); `&J=3x  
 BITMAPINFOHEADER bih; 70Ei<  
 bih.biBitCount=btm.bmBitsPixel; @1V?94T1  
 bih.biClrImportant=0; }BiA@n,  
 bih.biClrUsed=0; d6A+pa'2  
 bih.biCompression=0; 72dd%  
 bih.biHeight=btm.bmHeight; rGzGbI=  
 bih.biPlanes=1; MpJ]1  
 bih.biSize=sizeof(BITMAPINFOHEADER); "F?p Y@4  
 bih.biSizeImage=size; |al'_s}I  
 bih.biWidth=btm.bmWidth; zS `>65}e  
 bih.biXPelsPerMeter=0; >(W\Eh{J  
 bih.biYPelsPerMeter=0; *7C l1o  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); bK|nxL  
 static int filecount=0; uP1]EA  
 CString name; `)M&^Z=D  
 name.Format("pict%04d.bmp",filecount++); ]E1|^[y  
 name=m_Path+name; -uB*E1|Q  
 BITMAPFILEHEADER bfh; ES5a`"H  
 bfh.bfReserved1=bfh.bfReserved2=0; &zHY0fxX  
 bfh.bfType=((WORD)('M'<< 8)|'B'); oSH]TL2@Cd  
 bfh.bfSize=54+size; *-@@t+3  
 bfh.bfOffBits=54; Pk:b:(4  
 CFile bf; +Rq]_ sDu  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Q S<)*  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); V# JuNJ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 2K2_-  
  bf.WriteHuge(lpData,size); B";Dj~y  
  bf.Close(); qcfg 55]'c  
  nCount++; "gt*k#  
 } c/,B?  
 GlobalFreePtr(lpData); u4Z Accj  
 if(nCount==1) !lI1jb"  
  m_Number.Format("%d picture captured.",nCount); <\L=F8[  
 else L F!S`|FF  
  m_Number.Format("%d pictures captured.",nCount); ;RW5XnVx  
  UpdateData(FALSE); dDqT#N?Y  
} z*WQ=l2  
$~/x;z:  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) n0w0]dJ&lc  
{ 2l+t-  
 if(pMsg -> message == WM_KEYDOWN) sfC/Q"Zs  
 { #ihHAiy3  
  if(pMsg -> wParam == VK_ESCAPE) uC"Gm;0  
   return TRUE; 8e_9u@p+w  
  if(pMsg -> wParam == VK_RETURN) JgB"N/Oz  
   return TRUE; <'O|7. ^^  
 } 3#h@,>Z;  
 return CDialog::PreTranslateMessage(pMsg); >x${I`2w  
} d4LH`@SUZ-  
_p%@x:\  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t#7owY$^  
{ ~ \ Udl  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ `%=!_|  
  SaveBmp(); ];Y tw6A  
  return FALSE; V.w!]{xm  
} |L6 +e *  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ VpB+|%@p  
 CMenu pop; *4g:V;L  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); @Cl1G  
 CMenu*pMenu=pop.GetSubMenu(0); $wqi^q*)  
 pMenu->SetDefaultItem(ID_EXITICON); m[A$Sp_"-h  
 CPoint pt; ;uqi  
 GetCursorPos(&pt); - S%8  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); { ?]&P  
 if(id==ID_EXITICON) q`@8  
  DeleteIcon(); e it%U  
 else if(id==ID_EXIT) %kiPE<<x  
  OnCancel(); M1XzA `*  
 return FALSE; C 4\Q8uK  
} <2fvEW/#v  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 9j$J}=y  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) s5oU  
 AddIcon(); yu=(m~KX   
 return res; f6%7:B d  
} )IGx3+I ,  
^%/d]Zwb  
void CCaptureDlg::AddIcon() b+THn'2  
{ 8-q4'@(  
 NOTIFYICONDATA data; "XKd#ncP  
 data.cbSize=sizeof(NOTIFYICONDATA); kj!mgu#T  
 CString tip; nPjN\Es6  
 tip.LoadString(IDS_ICONTIP); <nF1f(ky  
 data.hIcon=GetIcon(0); iuEQ?fp  
 data.hWnd=GetSafeHwnd(); d'b q#r  
 strcpy(data.szTip,tip); %~qY\>  
 data.uCallbackMessage=IDM_SHELL; JPkI+0  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; kSO:xS0 _N  
 data.uID=98; ?^ `EI}g  
 Shell_NotifyIcon(NIM_ADD,&data); Med0O~T%  
 ShowWindow(SW_HIDE); ?yAjxoE~?  
 bTray=TRUE; yo#fJ`  
} Ufe@G\uyI  
>2K:O\&  
void CCaptureDlg::DeleteIcon() G":u::hR  
{ `MXGEJF  
 NOTIFYICONDATA data; <_-8)abK  
 data.cbSize=sizeof(NOTIFYICONDATA); IHj9n>c)[  
 data.hWnd=GetSafeHwnd(); r~T3Ieb  
 data.uID=98; 41\V;yib  
 Shell_NotifyIcon(NIM_DELETE,&data); 1lf]}V  
 ShowWindow(SW_SHOW); {_]<mwd  
 SetForegroundWindow(); YMn_9s7<  
 ShowWindow(SW_SHOWNORMAL); Yx<wYzD  
 bTray=FALSE; m/NXifi8l  
} {iVmae  
xu* dPG)v  
void CCaptureDlg::OnChange() "$|ne[b2  
{ 1'9YY")#  
 RegisterHotkey(); 4z!(!J )  
} q@Sj$  
yx/.4DW1Ua  
BOOL CCaptureDlg::RegisterHotkey() 2R`}}4<Z  
{ s%t =*+L\  
 UpdateData(); *gN)a%9  
 UCHAR mask=0; t`vIcCXqyl  
 UCHAR key=0; O:W4W=K  
 if(m_bControl) d# q8-  
  mask|=4; &BQ%df<y\  
 if(m_bAlt) LArfX,x3i  
  mask|=2; TS;?>J-  
 if(m_bShift) [^A>hs*  
  mask|=1; p`3$NCJN  
  key=Key_Table[m_Key.GetCurSel()]; *\F,?yU  
 if(bRegistered){ l*n4d[0J  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); *]* D^'  
  bRegistered=FALSE; :faB7wduW;  
 } -LEpT$v|  
 cMask=mask; 5gY9D!;:0D  
 cKey=key; <^wqN!/  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); p`{| [<  
 return bRegistered; JbEQ35r  
} is}Y+^j.  
[Xo}CU  
  四、小结  FK|q*  
F(;C \[Ep  
  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
批量上传需要先选择文件,再选择上传
认证码:
验证问题:
10+5=?,请输入中文答案:十五