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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: B #;s(O  
  EUJ1RhajF  
  一、实现方法 >aX:gN  
3KDu!w@  
  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: >t2]Ssi(  
$:xF)E  
#pragma data_seg("shareddata") zojuH8  
HHOOK hHook =NULL; //钩子句柄 |2WxcW]U.%  
UINT nHookCount =0; //挂接的程序数目 Q9Q!9B @  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Z3LQl(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 c1gz #,  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey YK(XS"Kl  
static int KeyCount =0; F+lm[4n  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ViCg|1c  
#pragma data_seg() -lnTYxo+]^  
A/ox#(!v  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 0G+L1a-  
v+|@}9|Z  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: |`N$>9qN  
N02zPC 8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 1v>  
cKey,UCHAR cMask) ~ra#UG\Y8  
{ 6RR4L^(m  
 BOOL bAdded=FALSE; 4`?sE*P@`  
 for(int index=0;index<MAX_KEY;index++){ ~)WfJ  
  if(hCallWnd[index]==0){ #L|JkBia  
   hCallWnd[index]=hWnd; -='8_B/75  
   HotKey[index]=cKey; ~e,f)?  
   HotKeyMask[index]=cMask; >DSNKU+j  
   bAdded=TRUE; ~gSF@tz@  
   KeyCount++; MYur3lj%_  
   break; /zChdjz  
  } t;Fbt("]:  
 } AAeQ-nbP  
 return bAdded; o06A=4I  
} 'vqj5YTj  
//删除热键 Qi(e`(,'  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /1[}G!  
{ kKFuTem_3  
 BOOL bRemoved=FALSE; )Tyky%P+iI  
 for(int index=0;index<MAX_KEY;index++){ bCJ<=X,g`K  
  if(hCallWnd[index]==hWnd){ ~(w=U *  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ V{7lltu  
    hCallWnd[index]=NULL; 5n&)q=jk=  
    HotKey[index]=0; ==PQ-Ia  
    HotKeyMask[index]=0; V{ 4i$'  
    bRemoved=TRUE; =B3!jir  
    KeyCount--; $1Q3Y'Q9  
    break; muqfSF  
   } FJ3:}r6 "  
  } u&l>cJ'  
 } es*_Oo1  
 return bRemoved; [[.&,6  
} /ze_{{o  
$=@9 D,R  
9.MGH2^ L?  
  DLL中的钩子函数如下: 3cV+A]i  
a[d{>Fb.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) TnMVHO-  
{ 8CN7+V  
 BOOL bProcessed=FALSE; _{Fdw  
 if(HC_ACTION==nCode) 47(1V/r  
 { ZmR[5 mv@  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 h~=\/vF  
   switch(wParam) R4Gg|Bh  
   {  mBD!:V'  
    case VK_MENU: RT_Pd\(qD  
     MaskBits&=~ALTBIT; H( DVVHx  
     break; x1&b@u  
    case VK_CONTROL: qMW%$L\HA  
     MaskBits&=~CTRLBIT; ;#6<bV  
     break; twJ|Jmd  
    case VK_SHIFT: r-\T}e2Gz  
     MaskBits&=~SHIFTBIT; oE|u;o  
     break; cQ8$,fo  
    default: //judge the key and send message fjK]m.w  
     break; \4`saM /x  
   } 7}iewtdy,  
   for(int index=0;index<MAX_KEY;index++){ ixI5Xd<  
    if(hCallWnd[index]==NULL) _sf0{/< )  
     continue; 6{Cu~G{]N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J:TI>*tn  
    { Zc' >}X[G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); O>"r. sR  
     bProcessed=TRUE; ,N@Icl  
    } v[3hnLN%  
   } e$xv[9  
  } !Z0rTC3d  
  else if((lParam&0xc000ffff)==1){ //有键按下 r{6B+3J  
   switch(wParam) 9'/|?I  
   { #QyK?i*  
    case VK_MENU: G~iYF(:&  
     MaskBits|=ALTBIT; q3pN/f;kr,  
     break; ja,L)b:  
    case VK_CONTROL: p#8LQP~0$  
     MaskBits|=CTRLBIT; P20]>Hg  
     break; 0F0(]7g^  
    case VK_SHIFT: %]:vT&M  
     MaskBits|=SHIFTBIT; ^?S@v1~7d  
     break; >I66R;  
    default: //judge the key and send message pg& ]F  
     break; w or'=byh\  
   } *l'$pJ X  
   for(int index=0;index<MAX_KEY;index++){ /cg]wG!n8  
    if(hCallWnd[index]==NULL) @,>=X:7  
     continue; Xw}Y!;<IEu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R82Zr@_  
    { :]z-Rz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); zHum&V8=H  
     bProcessed=TRUE; {;(g[H=q;  
    } m 'H  
   } z1@sEfk>  
  } JjTzq2'%  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 x8rFMR#S=  
   for(int index=0;index<MAX_KEY;index++){ Tdmo'"m8z_  
    if(hCallWnd[index]==NULL) ,%b1 ]zZQ  
     continue; r|H!s,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 3TvhOC>yG  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Fi3(glgd-  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ht74h  
   } d&R\7)0  
  } 7J!d3j2TR  
 } g]#zWTw(   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 8wx#,Xa  
} Y*X6lo  
ht cO ~b  
  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: F]&J%i F[  
&#b>AAx$2Y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <~8f0+"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); PG~m-W+  
{arjW3~M:  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: fdEj#Ux<H  
%?G.lej,x  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) K|J#/  
{ @j8L{FGnN  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) &7kSLat+9{  
 { sbiDnRf  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 rJ~(Xu>,s  
  SaveBmp(); Fe2 -;o  
  return FALSE; giq`L1<  
 } S22; g  
 …… //其它处理及默认处理 1vb0G ;a;|  
} >o7k%T|l$  
95&HsgdxJ  
']D( ({%g  
  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。 `,"Jc<R7Z  
56dl;Z)  
  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。 Z;:-8 HPDY  
tDkqwF),  
  二、编程步骤 `#bcoK5  
WI3!?>d  
  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"; )]R8 $S  
Y8(yOVy9  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; lHXH03  
zYsGI<4  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; q[ZYlF,Ho  
}J`Gm  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; j!rz@Y3  
)-oNy-YL  
  5、 添加代码,编译运行程序。 Sm5"Q  
\266N;JrN  
三、程序代码 w@We,FUJN  
j!dklQh0  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL \ZH=$c*W  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ,s K-gw  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 7Cjrh"al"  
#if _MSC_VER > 1000 J)]W[Nk  
#pragma once @<L.#gtP  
#endif // _MSC_VER > 1000 tA.C"  
#ifndef __AFXWIN_H__ ?1sY S  
#error include 'stdafx.h' before including this file for PCH %94"e7Hy  
#endif T /uu='3  
#include "resource.h" // main symbols I%Z &i-33y  
class CHookApp : public CWinApp \D=B-dREq  
{ 2~ a4ib  
 public: " B1' K8  
  CHookApp();  o~B=[  
  // Overrides  "(xu  
  // ClassWizard generated virtual function overrides s~CA @  
  //{{AFX_VIRTUAL(CHookApp) 3L|k3 `I4  
 public: *h1@eJHMz  
  virtual BOOL InitInstance(); )U` c9*.  
  virtual int ExitInstance(); |u[gI+TUE  
  //}}AFX_VIRTUAL -}s?!Pg>  
  //{{AFX_MSG(CHookApp) P^UcpU,  
  // NOTE - the ClassWizard will add and remove member functions here. 7w|s8B  
  // DO NOT EDIT what you see in these blocks of generated code ! #<{MtK_  
  //}}AFX_MSG p[Es4S}N  
  DECLARE_MESSAGE_MAP() r|+Zni]  
}; IkkrnG8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); H b.oKo$T  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bmLNR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); A|^?.uIM  
BOOL InitHotkey(); 9z#IdY$a  
BOOL UnInit(); :>=,sLfJ  
#endif  NNX/2  
_>.%X45xi  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. cQjJ9o7  
#include "stdafx.h" 23PSv8;EM  
#include "hook.h" {#MViBhd%  
#include <windowsx.h> x UYSD  
#ifdef _DEBUG 0#G"{M  
#define new DEBUG_NEW )%6v~,'3Y  
#undef THIS_FILE |j;`;"+B  
static char THIS_FILE[] = __FILE__; 6tM{cK%v1  
#endif 2B# \683  
#define MAX_KEY 100 %o-*~GQ@B  
#define CTRLBIT 0x04 8eNGPuoL)  
#define ALTBIT 0x02 7^1ikmYY  
#define SHIFTBIT 0x01 [0 $Y@ek[  
#pragma data_seg("shareddata") `?:'_K i  
HHOOK hHook =NULL; 0)Z7U$  
UINT nHookCount =0; o?>)CAo  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey N{'k ]&  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT zI(Pti  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Z'E@sc 9  
static int KeyCount =0; T!n<ya!  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift S}<(9@]z  
#pragma data_seg() Q]\x O/  
HINSTANCE hins; 'EQAG' YV  
void VerifyWindow(); =vWnqF:  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) =~)n,5  
//{{AFX_MSG_MAP(CHookApp) 3jQ |C=   
// NOTE - the ClassWizard will add and remove mapping macros here. q+ .=f.+Z  
// DO NOT EDIT what you see in these blocks of generated code! <rkF2-K,  
//}}AFX_MSG_MAP >U17BGJ.  
END_MESSAGE_MAP() (HEjmQjE  
>[#4Pb7_Y  
CHookApp::CHookApp() ?FLjvmE9  
{ =y<Fz*aA  
 // TODO: add construction code here, !j(R _wOq  
 // Place all significant initialization in InitInstance _ &T$0SZco  
} 2iUF%>  
@{bf]Oc  
CHookApp theApp; !"wIb.j }0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) QRRZMdEGs[  
{ Ruf*aF(  
 BOOL bProcessed=FALSE; _*+M'3&=  
 if(HC_ACTION==nCode) yO !*pC  
 { h0GXN\xI  
  if((lParam&0xc0000000)==0xc0000000){// Key up hAY_dM  
   switch(wParam) Gce![<|ph  
   { ow&R~_  
    case VK_MENU: vt1!|2{ h  
     MaskBits&=~ALTBIT; d"V^^I)yx&  
     break; _|F h^hq  
    case VK_CONTROL: 3[c54S+(U  
     MaskBits&=~CTRLBIT; ^Tl|v'   
     break; %T&kK2d;  
    case VK_SHIFT: MT3UJ6~P  
     MaskBits&=~SHIFTBIT; M|\ XFO  
     break; qU}[( 9~Ru  
    default: //judge the key and send message g ,.iM8  
     break; wBr0s *1I  
   } <fP|<>s$@1  
   for(int index=0;index<MAX_KEY;index++){ Ay{4R  
    if(hCallWnd[index]==NULL) ,Rf<6/A  
     continue; 7 `|- K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !#'*@a  
    { 6(eyUgnb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $(GXlhA  
     bProcessed=TRUE; 1(-)$m8}  
    } ZqSczS7uf  
   } i6[Hu8  
  } Ts.6 1Rx  
  else if((lParam&0xc000ffff)==1){ //Key down oRCj]9I$  
   switch(wParam) XX+4X*(o  
   { ^mH^cP?/  
    case VK_MENU: \=w|Zeu{l  
     MaskBits|=ALTBIT; Baq&>]  
     break; s01n[jQ  
    case VK_CONTROL: x]F:~(P  
     MaskBits|=CTRLBIT; M]oaWQu  
     break; wE'~Qj  
    case VK_SHIFT: &n['#7 <(!  
     MaskBits|=SHIFTBIT; WXJ%bH  
     break; q$\KE4v"  
    default: //judge the key and send message 7r:!HmRl  
     break; Zb@PwH4  
   } Mq-;sPsFP  
   for(int index=0;index<MAX_KEY;index++) -cMqq$  
   { Obbjl@]  
    if(hCallWnd[index]==NULL) \h:$q E7  
     continue; 0PZpE "$X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) At"@`1n_u'  
    { b8Y-!] F  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); l@':mX3xd  
     bProcessed=TRUE; 59GS:  
    } $~_TE\F1  
   } :X+7}!Wlo  
  } &)1+WrU  
  if(!bProcessed){ KZ&{Ya  
   for(int index=0;index<MAX_KEY;index++){ @<h@d_8^k  
    if(hCallWnd[index]==NULL) j2V^1  
     continue;   \\6/"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) PKmr5FB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); mkgDg y  
   } 6?r}bs6Msx  
  } '};pu;GA7  
 } 2WqjNqx)6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^`ny]3JA  
} {ymD.vf=9+  
K;Fy&p^d  
BOOL InitHotkey() L)kwMk  
{ 86oa>#opU  
 if(hHook!=NULL){ 9[T}cN=|  
  nHookCount++; rQCj^=cf;~  
  return TRUE; Ean #>h  
 } ht)J#Di  
 else [8[g_  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); n{aD4&  
  if(hHook!=NULL) OLTgBXh  
   nHookCount++; X$)<>e]!>  
  return (hHook!=NULL); eX>x +]l6  
} Rjt]^gb!*  
BOOL UnInit() TF2'-"2Y  
{ h<JV6h:8  
 if(nHookCount>1){ C`Zz\DNG@  
  nHookCount--; &Yb!j  
  return TRUE; O(#DaFJv  
 } icH\(   
 BOOL unhooked = UnhookWindowsHookEx(hHook); ^i:%0"[*^i  
 if(unhooked==TRUE){ qi!+ Ceo}  
  nHookCount=0; 5NH NnDhuL  
  hHook=NULL; T@Mrbravc  
 } lG6P+ Z/nf  
 return unhooked; 'a[|'  
} t[ cHdI  
.]24V!J(1w  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) d[=~-[  
{ JYc;6p$<i  
 BOOL bAdded=FALSE; R `  
 for(int index=0;index<MAX_KEY;index++){ c<Fr^8  
  if(hCallWnd[index]==0){ /?VwoSgV^  
   hCallWnd[index]=hWnd; "2# #Fcu=  
   HotKey[index]=cKey;  Jpm=V*P  
   HotKeyMask[index]=cMask; Mh3Tfp  
   bAdded=TRUE; sN"<baZ  
   KeyCount++; l$ ^LY)i  
   break; $bOiP  
  } 4d-f 6iiFV  
 } ~lib~Y'-  
 return bAdded; it77x3Mm F  
} c&X2k\  
mQUI9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Xs}.7  
{ grrM[Y7#~b  
 BOOL bRemoved=FALSE; UU'0WIbY6  
 for(int index=0;index<MAX_KEY;index++){ a]\l:r  
  if(hCallWnd[index]==hWnd){ 4h~CDy%_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ip8%9fG\>  
    hCallWnd[index]=NULL; fRh}n ^X  
    HotKey[index]=0; ZD~ra7  
    HotKeyMask[index]=0; {9B"'65o  
    bRemoved=TRUE; :8=7)cW  
    KeyCount--; []OmztB  
    break; @S9^~W3G3  
   } <<w*_GM  
  } 7bSj[kuN  
 } sBm)D=Kll  
 return bRemoved; LT[g +zGB  
} c]}F$[>oN'  
?&Ug"$v  
void VerifyWindow() XSHK7vpMf  
{ N(s5YX7<hd  
 for(int i=0;i<MAX_KEY;i++){ wAD%1;  
  if(hCallWnd!=NULL){ l$Y*ii  
   if(!IsWindow(hCallWnd)){ q<[m(]:  
    hCallWnd=NULL; _59f.FsVR  
    HotKey=0; #K&XY6cTj  
    HotKeyMask=0; )[wB:kG  
    KeyCount--; N2 4J!L  
   } n,D&pl9f  
  } g^I?u$&E  
 } hU'h78bt(  
} Xrl# DN  
L0.F }~S  
BOOL CHookApp::InitInstance() X~g U$  
{  T_)G5a  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); *(E]]8o  
 hins=AfxGetInstanceHandle(); )sN}ClgJ  
 InitHotkey(); 0uL*-/|  
 return CWinApp::InitInstance(); fj|X`,TiZ;  
} tJ$gH;  
T {:8,CiW  
int CHookApp::ExitInstance() U'@#n2p:k  
{ +N}yqgE  
 VerifyWindow(); ;&c9!LfP  
 UnInit(); ^|%u%UR  
 return CWinApp::ExitInstance(); UMUG~P&@  
} TrPw*4h 9s  
?k`UQi]Q  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 'D'H)J  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) "O~7s}  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ @)XR  
#if _MSC_VER > 1000 Tm\a%Z`U>  
#pragma once >=1Aa,_tc  
#endif // _MSC_VER > 1000 U3u j`Oq  
y**YFQ*sc  
class CCaptureDlg : public CDialog 7bk`u'0%  
{ HSR,moI  
 // Construction (T!#7  
 public: nT :n>ja  
  BOOL bTray; W#&BU-|2  
  BOOL bRegistered; X'{ o/U.  
  BOOL RegisterHotkey(); smKp3_r  
  UCHAR cKey; TXT!Ae  
  UCHAR cMask; dWTc3@xd  
  void DeleteIcon(); i^@hn>s$  
  void AddIcon(); jP#I](\eG  
  UINT nCount; % oJH 6F  
  void SaveBmp(); 6L"b O'_5K  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor !&},h=  
  // Dialog Data ;;S9kNp^v  
  //{{AFX_DATA(CCaptureDlg) }Q a  
  enum { IDD = IDD_CAPTURE_DIALOG }; H1c>3c  
  CComboBox m_Key; ;Wgkf_3  
  BOOL m_bControl; [}I|tb>Pg  
  BOOL m_bAlt; 9zl-C*9vj  
  BOOL m_bShift; MbxJ3"@  
  CString m_Path; $px1D$F!  
  CString m_Number; _Un*x5u2O  
  //}}AFX_DATA ?f= ~Pn+  
  // ClassWizard generated virtual function overrides CHyT'RT  
  //{{AFX_VIRTUAL(CCaptureDlg) 3tW}a`z9  
 public: ivg W[]  
  virtual BOOL PreTranslateMessage(MSG* pMsg); !Qq~lAJO;  
 protected: Lb#PiTJI  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -H F1c  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `-MCI)Fq_R  
  //}}AFX_VIRTUAL &o]fBdn  
  // Implementation cJ\ 1ndBH  
 protected: 5,|of{8  
  HICON m_hIcon; tIk$4)ZAl  
  // Generated message map functions JFdMYb  
  //{{AFX_MSG(CCaptureDlg) ?$MO!  
  virtual BOOL OnInitDialog(); Rrrq>{D  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 4-BrE&2f  
  afx_msg void OnPaint(); =)}Yw)  
  afx_msg HCURSOR OnQueryDragIcon(); 5/R ~<z  
  virtual void OnCancel(); e=+q*]>  
  afx_msg void OnAbout(); d*x&Uh[K  
  afx_msg void OnBrowse(); .qLX jU  
  afx_msg void OnChange(); Bk] `n'W  
 //}}AFX_MSG ^HU>fkSk  
 DECLARE_MESSAGE_MAP() CF6qEG6  
}; :Wihb#TO)  
#endif _yp<#q]  
1,Jy+1G0w  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >y+?Sz!  
#include "stdafx.h" @O/"s~d-  
#include "Capture.h" Wcbm,O4u  
#include "CaptureDlg.h" drvz [ 9;  
#include <windowsx.h> HQSFl=Q  
#pragma comment(lib,"hook.lib") \*M;W|8aB  
#ifdef _DEBUG O>>/2V9  
#define new DEBUG_NEW !D!"ftOm  
#undef THIS_FILE 3:<[;yo  
static char THIS_FILE[] = __FILE__; F-XMy>9  
#endif *^KEb")$  
#define IDM_SHELL WM_USER+1 <sn,X0W  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v%kl*K`*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }zIWagC6  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; )Y`ybADd3  
class CAboutDlg : public CDialog Bjh8uW G  
{ 1)5/a5  
 public: ;Fd1:"1pP  
  CAboutDlg(); /8 y v8  
  // Dialog Data *TrpW?]Y&  
  //{{AFX_DATA(CAboutDlg) J3XG?' }  
  enum { IDD = IDD_ABOUTBOX }; ve\@u@K^  
  //}}AFX_DATA (Vn3g ra  
  // ClassWizard generated virtual function overrides |tC=  j.  
  //{{AFX_VIRTUAL(CAboutDlg) N/[!$B0H@  
 protected: nbW.x7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support wb%4f6i  
  //}}AFX_VIRTUAL >%5GMx>m  
  // Implementation lk[u  
 protected: WpOH1[ 8v  
  //{{AFX_MSG(CAboutDlg) Xy}>O*  
  //}}AFX_MSG b8 1cq,  
  DECLARE_MESSAGE_MAP() (Q.tH  
}; sX ]gL  
K"!U&`T  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) t qUBl?i  
{ Zq 'FOzs  
 //{{AFX_DATA_INIT(CAboutDlg) 0d$LUQ't  
 //}}AFX_DATA_INIT !^EA}N.u  
} N'PK4:  
~Lq`a@]A  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) YV'B*arIA  
{ Esm=sPW  
 CDialog::DoDataExchange(pDX); %0({ MU  
 //{{AFX_DATA_MAP(CAboutDlg) q,OCA\  
 //}}AFX_DATA_MAP *,)1Dcv(  
} {{)pb>E  
M,cz7,  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) IR?nH`V  
 //{{AFX_MSG_MAP(CAboutDlg) >QPCYo<E  
 // No message handlers ]bbP_n8  
 //}}AFX_MSG_MAP 3NdO3-~)  
END_MESSAGE_MAP() $oJjgAxcZ  
JE#H&]  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ^F- 2tc  
: CDialog(CCaptureDlg::IDD, pParent) '@zMZc!  
{ <tm=  
 //{{AFX_DATA_INIT(CCaptureDlg) +jS<n13T  
  m_bControl = FALSE; '+GY6Ecg  
  m_bAlt = FALSE; O_ vH w^  
  m_bShift = FALSE; WqS$C;]%  
  m_Path = _T("c:\\"); rCb$^(w{7  
  m_Number = _T("0 picture captured."); (!?%"e  
  nCount=0; 3HNm`b8G4m  
  bRegistered=FALSE; 4sfq,shRq  
  bTray=FALSE; Pb1.X9*8c  
 //}}AFX_DATA_INIT EztuVe  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 k2.\1}\  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); C>F5=&  
} 1(Z+n,Hh  
F=PBEaX  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) QIdml*Np?H  
{ %$bhg&}  
 CDialog::DoDataExchange(pDX); NBAOVYK  
 //{{AFX_DATA_MAP(CCaptureDlg) zn0%%x+!g  
  DDX_Control(pDX, IDC_KEY, m_Key); oTr,zRL  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); e.Q'l/g  
  DDX_Check(pDX, IDC_ALT, m_bAlt); y3bL\d1  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); +Y2D @K?)  
  DDX_Text(pDX, IDC_PATH, m_Path); :GFK |  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 0g Hd{H=  
 //}}AFX_DATA_MAP @i#=1)Ze  
} |+Z-'k~Q  
Ir(U7D  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) R8YU#D (Q  
//{{AFX_MSG_MAP(CCaptureDlg) AG#Mj(az!  
 ON_WM_SYSCOMMAND() 1;!dTh  
 ON_WM_PAINT() Pa=xc>m^  
 ON_WM_QUERYDRAGICON() ZkdSgc')  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) >.H}(!  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ^)'D eP/  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 4F<wa s/  
//}}AFX_MSG_MAP  Y=H_U$  
END_MESSAGE_MAP() .bRtK+}F#  
E 0OHl  
BOOL CCaptureDlg::OnInitDialog() jw/@]f;N  
{ m63>P4h?  
 CDialog::OnInitDialog(); 9|NF)~Q}'  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); G @]n(\7Y  
 ASSERT(IDM_ABOUTBOX < 0xF000); 'R#MH  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ]ki) (Bb  
 if (pSysMenu != NULL) <e wcWr  
 { xa 967Ki9"  
  CString strAboutMenu; {bC(>k|CQ  
  strAboutMenu.LoadString(IDS_ABOUTBOX); fP- =wd  
  if (!strAboutMenu.IsEmpty()) .Q{VY]B^  
  { uLfk>&hc  
   pSysMenu->AppendMenu(MF_SEPARATOR); FuAs$;  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); K;`W4:,  
  } -zZb]8\E  
 } !Q}Bz*Y  
 SetIcon(m_hIcon, TRUE); // Set big icon 3ly ]DTbz  
 SetIcon(m_hIcon, FALSE); // Set small icon {$7vd  
 m_Key.SetCurSel(0); ^* CKx  
 RegisterHotkey(); ~wcp&D  
 CMenu* pMenu=GetSystemMenu(FALSE); |Qpd<L  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Gs4t6+Al  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); i&<@}:,  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); dsK*YY jH  
 return TRUE; // return TRUE unless you set the focus to a control ;Y`8Ee4vH  
} !u/c'ZLZ>  
i-4?]h k  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) CUft  
{ J/rF4=j%xy  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) <"S`ZOn  
 { j9}.U \  
  CAboutDlg dlgAbout; BFqM6_/J  
  dlgAbout.DoModal(); 61sEeM  
 } /N")uuv  
 else @HY P_hR  
 { kk OjAp{<t  
  CDialog::OnSysCommand(nID, lParam); ;g?o~ev 8  
 } x4`|[  
} k`\L-*:Ji  
+xU=7chA  
void CCaptureDlg::OnPaint() 7c<_j55(  
{ &Gm3  
 if (IsIconic()) K]^Jl0  
 { XAB/S8e  
  CPaintDC dc(this); // device context for painting s -F3(mc(  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); -AQ 7Bd  
  // Center icon in client rectangle M(ie1Ju  
  int cxIcon = GetSystemMetrics(SM_CXICON); G*-7}7OAs  
  int cyIcon = GetSystemMetrics(SM_CYICON); BDX>J3h  
  CRect rect; UI wTf2B  
  GetClientRect(&rect); /<J5?H  
  int x = (rect.Width() - cxIcon + 1) / 2; =A_{U(>  
  int y = (rect.Height() - cyIcon + 1) / 2; 7p {2&YhB  
  // Draw the icon KPZqPtb;  
  dc.DrawIcon(x, y, m_hIcon); ,8DjQz0ZPo  
 } "ER= c3 t  
 else J6nH|s8  
 {  ~!e(e2  
  CDialog::OnPaint(); Re1}aLd  
 }  \Awqr:A&  
} #qEUGD`  
bV*q~ @xh  
HCURSOR CCaptureDlg::OnQueryDragIcon() B"t4{1/  
{ z:08;}t  
 return (HCURSOR) m_hIcon; !1<>][F  
} JP]-a!5Ru  
8vj]S5  
void CCaptureDlg::OnCancel() l5U^lc  
{ r90R~'5x9  
 if(bTray) +1eb@b X  
  DeleteIcon(); wFJ*2W:  
  CDialog::OnCancel(); y )7;"3Q<  
} = d!YM6G  
C`aUitL}  
void CCaptureDlg::OnAbout() SPINV.  
{ cdg &)  
 CAboutDlg dlg; n,p \~Tu,  
 dlg.DoModal(); U.ew6`'Te  
} C-(O*hK  
j$k/oQ  
void CCaptureDlg::OnBrowse() %'9&JsO  
{ tU-jtJ  
 CString str; A*W/Q<~I  
 BROWSEINFO bi; * [b~2  
 char name[MAX_PATH]; \obM}caT  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 4@@gC&:Y  
 bi.hwndOwner=GetSafeHwnd(); *{=q:E$  
 bi.pszDisplayName=name; .zJZ*\2ob  
 bi.lpszTitle="Select folder"; }jL4F$wC  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ItG|{Bo  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); n&E/{o(  
 if(idl==NULL) eM^Y  
  return; "gXvnl  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); #aadnbf  
 str.ReleaseBuffer(); oho~?.F  
 m_Path=str; WAVEwA`r  
 if(str.GetAt(str.GetLength()-1)!='\\') iv6bXV'N  
  m_Path+="\\"; tk+t3+  
 UpdateData(FALSE); a*o k*r  
} 3e|,Z'4}4  
{InW%qSn_  
void CCaptureDlg::SaveBmp() @Z@S;RWSU  
{ #/WjKr n  
 CDC dc; (U*Zz+ R   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Rm@F9D[,  
 CBitmap bm; @SAJ*h fb0  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6/|"y  
 int Height=GetSystemMetrics(SM_CYSCREEN); 0"u=g)3  
 bm.CreateCompatibleBitmap(&dc,Width,Height); -n6T^vf  
 CDC tdc; `^DP<&{  
 tdc.CreateCompatibleDC(&dc); bE"J&;|  
 CBitmap*pOld=tdc.SelectObject(&bm); q/3co86c  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ?WrL<?r)}U  
 tdc.SelectObject(pOld); inyS4tb  
 BITMAP btm; ?MJ5GVeH  
 bm.GetBitmap(&btm); a&gf0g;@I  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; >soSOJ[   
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); w6[$vib'  
 BITMAPINFOHEADER bih; TA+/35^?  
 bih.biBitCount=btm.bmBitsPixel; <}AmzeHr+  
 bih.biClrImportant=0; OJ}aN>k  
 bih.biClrUsed=0; ~tqNxlA  
 bih.biCompression=0; dkOERVRe  
 bih.biHeight=btm.bmHeight; PjU.4aZ  
 bih.biPlanes=1; *G,r:Bnb  
 bih.biSize=sizeof(BITMAPINFOHEADER); o%v,6yv  
 bih.biSizeImage=size; `R o>?H  
 bih.biWidth=btm.bmWidth; |d_ rK2  
 bih.biXPelsPerMeter=0; l4q7,%G  
 bih.biYPelsPerMeter=0; ~#iAW@  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); w%f51Ex  
 static int filecount=0; +9_E+H'?!  
 CString name; }-paGM@'Nd  
 name.Format("pict%04d.bmp",filecount++); fU4{4M+9"  
 name=m_Path+name; '59l.  
 BITMAPFILEHEADER bfh; -257g;  
 bfh.bfReserved1=bfh.bfReserved2=0; l78 :.  
 bfh.bfType=((WORD)('M'<< 8)|'B'); A Zv| |8p  
 bfh.bfSize=54+size; "C9.pdP\8  
 bfh.bfOffBits=54; "'6R|<u=:  
 CFile bf; 2$oGy  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ CIf""gL9  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Xd 9<`gu  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); W7 9.,#  
  bf.WriteHuge(lpData,size); Bqb3[^;~  
  bf.Close(); M,N(be-  
  nCount++; qAuq2pHA+d  
 } v5`Odbc=w  
 GlobalFreePtr(lpData); T q5F'@e  
 if(nCount==1) Q9 RCN<!  
  m_Number.Format("%d picture captured.",nCount); c]:@y"W5$  
 else IeJ@G)  
  m_Number.Format("%d pictures captured.",nCount); _ 4+=S)$  
  UpdateData(FALSE); ]Oe[;<I  
} m{0u+obi&w  
/M~rmIks  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) u9dL-Nr`  
{ ?a-}1A{  
 if(pMsg -> message == WM_KEYDOWN) hin6cac  
 { *wJ'Z4_5F  
  if(pMsg -> wParam == VK_ESCAPE) O; <YLS^|6  
   return TRUE; Px"K5c*  
  if(pMsg -> wParam == VK_RETURN) IN94[yW{1  
   return TRUE; & A@ !g  
 } 8_ _C T  
 return CDialog::PreTranslateMessage(pMsg); 7)a u#K6  
} .t9zF-jk  
k3t2{=&'&x  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) TZk.h8  
{ .A Z+|?d  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ E{6X-C[)v  
  SaveBmp(); U>_#,j  
  return FALSE; -q/FxESp  
} 5V/CYcO  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ sR*JU%  
 CMenu pop; TVFxEV7Fx  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); \Rvsy;7  
 CMenu*pMenu=pop.GetSubMenu(0); a fhZM$  
 pMenu->SetDefaultItem(ID_EXITICON); F`YxH*tO7  
 CPoint pt; $~*d.  
 GetCursorPos(&pt); _i{4 4zE  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); EM.rO/qcW  
 if(id==ID_EXITICON) _ a,XL<9I  
  DeleteIcon(); ZI#Xh5  
 else if(id==ID_EXIT) :7Q, `W9  
  OnCancel(); W'9=st'  
 return FALSE; R!LKGiN  
} |1(9_=i'  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); XD\Z$\UJE  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8?7:sfc  
 AddIcon(); mF !=H%  
 return res; D?"TcA  
} Aw *:5I[  
/1q] D8  
void CCaptureDlg::AddIcon() cZ~\jpK  
{ ;i><03  
 NOTIFYICONDATA data; v{2 Vg  
 data.cbSize=sizeof(NOTIFYICONDATA); 4';tMiz  
 CString tip; &Wup 7  
 tip.LoadString(IDS_ICONTIP); @*c ) s_  
 data.hIcon=GetIcon(0); lC i_G3C  
 data.hWnd=GetSafeHwnd(); -m~[z  
 strcpy(data.szTip,tip); ~ Qt$)  
 data.uCallbackMessage=IDM_SHELL; &j7l#Urq  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ,FPgbs  
 data.uID=98; 4n@, p0   
 Shell_NotifyIcon(NIM_ADD,&data); +<ey Iw  
 ShowWindow(SW_HIDE); ynN[N(m#  
 bTray=TRUE; []M+(8Z_P  
} -h8!O+7 .  
`&U ['_%  
void CCaptureDlg::DeleteIcon() (IR'~ :W  
{ R%Yws2Le2  
 NOTIFYICONDATA data; a;Y9wn  
 data.cbSize=sizeof(NOTIFYICONDATA); 3:Sv8csT  
 data.hWnd=GetSafeHwnd(); -j9R%+YW<  
 data.uID=98; wWflZ"%  
 Shell_NotifyIcon(NIM_DELETE,&data); .j4IW 3)  
 ShowWindow(SW_SHOW); jL)aU> kN  
 SetForegroundWindow(); 4>^ %_Xj[  
 ShowWindow(SW_SHOWNORMAL); <u"#Jw/VP  
 bTray=FALSE; -K/' }I  
} c"J(? 1O  
vwzTrWA=  
void CCaptureDlg::OnChange() T+2I:W%  
{ }h>e=<  
 RegisterHotkey(); )x"Z$jIs  
} /BVNJNhz  
?lU]J]  
BOOL CCaptureDlg::RegisterHotkey() FO}4~_W{  
{ ' n~N*DH  
 UpdateData(); ,Ql3RO,  
 UCHAR mask=0; Xb3vvHdI  
 UCHAR key=0; n@g[VR2t  
 if(m_bControl) g m],  
  mask|=4; 4!6g[[| &J  
 if(m_bAlt) W9V%Xc`LQ  
  mask|=2; Ye!=  
 if(m_bShift) #D+Fq^="P  
  mask|=1; p9_45u`u2  
  key=Key_Table[m_Key.GetCurSel()]; ,l7ty#j  
 if(bRegistered){ _z m<[0(  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ZLKS4  
  bRegistered=FALSE; 9LJ/m\bi  
 } h/(9AO}t  
 cMask=mask; rT}d<c Sf  
 cKey=key; ieS5*@^k  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); PD/JXExK  
 return bRegistered; ^Z:x poz,  
} A7_*zR @  
! 2Y, a  
  四、小结 'A8T.BU  
KS(T%mk\  
  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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