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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: KqB(W ,$  
  Ee4oTU5Mb  
  一、实现方法 od-N7lp#  
~sk 4v:-  
  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: aIJ[K  
a*?? !  
#pragma data_seg("shareddata") <tFq6|  
HHOOK hHook =NULL; //钩子句柄 A "w 1GBx  
UINT nHookCount =0; //挂接的程序数目 %Wu3$b  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Hh;7 hY\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 CQ13fu +|6  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ucB<  
static int KeyCount =0; Q%KS$nP9  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 N )&3(A@  
#pragma data_seg() _L&C4 <e'  
:@kSDy+*Q  
  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。 XB^z' P{-Y  
-S9$C*t  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: \}G/F!  
D(L%fK`+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR o3%Gc/6%  
cKey,UCHAR cMask) &{l?j>|TM  
{ (}c}=V  
 BOOL bAdded=FALSE; _%"/I96'  
 for(int index=0;index<MAX_KEY;index++){ -CxaOZG  
  if(hCallWnd[index]==0){ .PxtcC.K  
   hCallWnd[index]=hWnd; n802!d+Tn  
   HotKey[index]=cKey; }JvyjE  
   HotKeyMask[index]=cMask; /z~;.jRg  
   bAdded=TRUE; <BT}Tv9  
   KeyCount++; OSsdB%bIu`  
   break; ~F DJKGK  
  } -,}f6*  
 } +ZXk0sP_<  
 return bAdded; VxaJ[s3PQ&  
} .pG_j]  
//删除热键 2sWM(SN  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u9}=g%TV  
{ +d Ig&}Tr  
 BOOL bRemoved=FALSE; lts{<AU~  
 for(int index=0;index<MAX_KEY;index++){ 3X%>xUI  
  if(hCallWnd[index]==hWnd){ 9<,\ +}^{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %0=|WnF-  
    hCallWnd[index]=NULL; }0c'hWMZ}  
    HotKey[index]=0; X[|-F3o  
    HotKeyMask[index]=0; :8\z 0  
    bRemoved=TRUE; 6fQQKM@a|  
    KeyCount--; vvdC.4O  
    break; 7e>n{rl  
   } r!j_KiUy  
  } :C>slxY  
 } D0tI  
 return bRemoved; y \V!OY@  
} =][[TH  
X_O(j!h  
1j3mTP  
  DLL中的钩子函数如下: v(]\o;/O  
XeJx/'9o{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "J7=3$CA  
{ l.Qj?G  
 BOOL bProcessed=FALSE; YzsHec  
 if(HC_ACTION==nCode) M>8#is(pV  
 { *|ubH?71%Y  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 I}$Y[Jve  
   switch(wParam) B0nkHm.Sj  
   {  Ws.F=kS>h  
    case VK_MENU: _Su$oOy(Ea  
     MaskBits&=~ALTBIT; YG!~v~sV  
     break; 4GeWo@8h  
    case VK_CONTROL: ;1K.SDj  
     MaskBits&=~CTRLBIT; x4R[Q&:M  
     break; U $e-e/  
    case VK_SHIFT: !&?(ty^F  
     MaskBits&=~SHIFTBIT; 0P&rTtU6  
     break; 3zv_q&+8b  
    default: //judge the key and send message 0ir]  
     break; ^JJ*pT:  
   } qAHQZKk  
   for(int index=0;index<MAX_KEY;index++){ >t3%-Kc  
    if(hCallWnd[index]==NULL) 0x[v)k9"0  
     continue; -7$7TD`'7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DMsxHAE1  
    { 7_ZfV? .  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  b-yfBO  
     bProcessed=TRUE; wHAoO#`wn5  
    } kk )9!7  
   } ~bg?V0  
  } M7BJ$fA0E  
  else if((lParam&0xc000ffff)==1){ //有键按下 Nz\=M|@(#  
   switch(wParam) <jY"+@rF  
   { 0a ZplE,  
    case VK_MENU: Mb"i}Yt{  
     MaskBits|=ALTBIT; J *5 )g  
     break; `o)rAD^e  
    case VK_CONTROL: %F]4)XeW-+  
     MaskBits|=CTRLBIT; oj;Rh!O  
     break; josc  
    case VK_SHIFT: C`%cPl  
     MaskBits|=SHIFTBIT; m\O<Yc keA  
     break; 6;"jq92in*  
    default: //judge the key and send message +MvcW.W~  
     break; Qis[j-?:  
   } pa`"f&JO  
   for(int index=0;index<MAX_KEY;index++){ _.KKh62CN  
    if(hCallWnd[index]==NULL) ` XE8[XY  
     continue; V80g+)|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :Bz*vH  
    { ~K&ko8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); S[n ;u-U  
     bProcessed=TRUE; ;r B2Q H]  
    } L$=6R3GI  
   } Akb#1Ww4  
  } #kR8v[Z  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ! c4pFQB  
   for(int index=0;index<MAX_KEY;index++){ "6[fqW65  
    if(hCallWnd[index]==NULL) 5k)/SAU0  
     continue; ~Uz,%zU#3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) B>AmH%f/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^M0e0  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 EuOrwmdj  
   } xRuAt/aC  
  } DZ<q)EpC  
 } & w&JE]$ 5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); W]}y:_t4  
} ,UNCBnv1  
v0+mh]  
  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: ,l+lokD-#  
b*i_'k}*<g  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f*)8bZDD  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >r J9^rS  
l6] :Zcd0  
  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: !6{; z/Hy  
Tk\?$n  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ac{"$P`  
{ 0&XdCoIe  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) E]Dcb*t  
 { n]{sBI3  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 sl?> X)}  
  SaveBmp(); rWsUWA T*  
  return FALSE; v/gxQy+l  
 } j N":9+F  
 …… //其它处理及默认处理 &m<:&h& b  
} di $\\ Ah  
2%o@?Rp  
h \dq]yOl  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 lrrNyaFn  
3msb"|DG  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 jNV)=s^ed[  
H%y!lR{c^D  
  二、编程步骤 <vS3 [(  
{HoeK>rd  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; YytO*^e}}  
4k%y*L  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; LGu K@^  
G)5R iRcs  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; sKD sps^$  
d7(g=JK<  
  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; uknX py))  
pe%$(%@v  
  5、 添加代码,编译运行程序。 ,cj531.  
'$nm~z,V  
三、程序代码 5jMI33D  
fib#)KE  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL d!>.$|b  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 8);G'7O  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ l5; SY  
#if _MSC_VER > 1000 TQ hu$z<  
#pragma once .:dy  d  
#endif // _MSC_VER > 1000 R(.5Hs  
#ifndef __AFXWIN_H__ PqUjBP\  
#error include 'stdafx.h' before including this file for PCH gu:8+/W8L  
#endif T)N_~f|  
#include "resource.h" // main symbols my1FW,3  
class CHookApp : public CWinApp U0X,g(2'  
{ k9Pwf"m|](  
 public: gs/ i%O  
  CHookApp(); g_8A1lt  
  // Overrides e97Ll=>  
  // ClassWizard generated virtual function overrides ZhvZe/  
  //{{AFX_VIRTUAL(CHookApp) 5ub|r0&M  
 public: R"Ff(1m  
  virtual BOOL InitInstance(); cl,\N\  
  virtual int ExitInstance(); IZ2(F,{o  
  //}}AFX_VIRTUAL 2&b?NqEeZ  
  //{{AFX_MSG(CHookApp) %mF:nU4  
  // NOTE - the ClassWizard will add and remove member functions here. $f>h_8cla  
  // DO NOT EDIT what you see in these blocks of generated code ! 41^=z[k  
  //}}AFX_MSG }Zuk}Og9+  
  DECLARE_MESSAGE_MAP() {~*^jS']5  
}; ;zF3e&e(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); VA D9mS^~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |!Ryl}Oi  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); r3OR7f[  
BOOL InitHotkey(); vIzREu|5  
BOOL UnInit(); esh7*,7-z*  
#endif Gn?NY}.S  
rm}%C(C{J  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. T5<851rH  
#include "stdafx.h" 'GyO  
#include "hook.h" PAYS~MnV@3  
#include <windowsx.h> qnc?&f  
#ifdef _DEBUG uT :Yh6  
#define new DEBUG_NEW v~.nP} E^  
#undef THIS_FILE ?Sj >b   
static char THIS_FILE[] = __FILE__; 7oWT6Qa5  
#endif 8GN_ 3pT  
#define MAX_KEY 100 sV']p#HK0  
#define CTRLBIT 0x04 (8Ptuh6\\2  
#define ALTBIT 0x02 IoAG!cS  
#define SHIFTBIT 0x01 /8Wfs5N  
#pragma data_seg("shareddata") F9}jiCom  
HHOOK hHook =NULL; `W=3_  
UINT nHookCount =0; 6< hE]B)  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey %noByq,?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT v}`{OE:-J  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey gc6Zy|^V4`  
static int KeyCount =0; 4>t'4p6{  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift yw@kh^L  
#pragma data_seg() Q# Yba  
HINSTANCE hins; * a ?qV  
void VerifyWindow(); &2P=74\=  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) '73g~T%$^*  
//{{AFX_MSG_MAP(CHookApp) ]Y.GU7`  
// NOTE - the ClassWizard will add and remove mapping macros here. )hy(0 D  
// DO NOT EDIT what you see in these blocks of generated code! 9\ulS2d  
//}}AFX_MSG_MAP d!P3<:+R[  
END_MESSAGE_MAP() 7ciSIJ  
;}>g/lw  
CHookApp::CHookApp()  Gv(?u  
{ P Y&(ObC  
 // TODO: add construction code here, iVSN>APe  
 // Place all significant initialization in InitInstance o)]mJb~XG-  
} RW4,j&)  
1OI/,y8}  
CHookApp theApp; G(;hJ'LT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^!v{ >3  
{ ,wYA_1$$H  
 BOOL bProcessed=FALSE; Q1[3C(  
 if(HC_ACTION==nCode) qP k`e}D  
 { ASU.VY  
  if((lParam&0xc0000000)==0xc0000000){// Key up ou\M}C`E  
   switch(wParam) b/soU2?^  
   { \?_M_5Nb  
    case VK_MENU: o)2KQ$b>Q  
     MaskBits&=~ALTBIT; umo<9Y  
     break; eYQPK?jo  
    case VK_CONTROL: 7cQFH@SC  
     MaskBits&=~CTRLBIT; [C^&iLX/F*  
     break; % |^V)  
    case VK_SHIFT: pf8M0,AY  
     MaskBits&=~SHIFTBIT; (ebC80M  
     break; E#zLm  
    default: //judge the key and send message eHl)/='  
     break; 4 \Ig<C9  
   } q]2t3aY%  
   for(int index=0;index<MAX_KEY;index++){ S HxD(6  
    if(hCallWnd[index]==NULL) 1DR ih>+#  
     continue; kMx^L;:n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) , G2( l  
    { dTrz7ayH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5Y4#aq  
     bProcessed=TRUE; xf4CM,Z7(  
    } %y|L'C,ge"  
   } 1=L5=uz1d:  
  } UP .4#1I  
  else if((lParam&0xc000ffff)==1){ //Key down r "uQ|  
   switch(wParam) 0&$,?CL?  
   {  MU>6s`6O  
    case VK_MENU: E=# O|[=  
     MaskBits|=ALTBIT; = 9!|%j  
     break; k-!Jww  
    case VK_CONTROL: `8lS)R!  
     MaskBits|=CTRLBIT; e.VQ!)>  
     break; K6EG"Vv!  
    case VK_SHIFT: 'ju'O#A9  
     MaskBits|=SHIFTBIT; `e[>S  
     break; <Toy8-kj  
    default: //judge the key and send message OB4nE}NO  
     break; ){I!orQ  
   } "$#<+H>O  
   for(int index=0;index<MAX_KEY;index++) .LI(2lP  
   { 34F;mr"yp  
    if(hCallWnd[index]==NULL) j"r7M|Z+V  
     continue; !nDiAjj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !O 0{ .k  
    { ],-(YPiAD  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `lcQ Yd<,4  
     bProcessed=TRUE; ,(3oAj\  
    } 2DNB?,uP,'  
   } gp<XTLJ@>  
  } p#0L@!,  
  if(!bProcessed){ mFrDV,V  
   for(int index=0;index<MAX_KEY;index++){ `$t|O&z  
    if(hCallWnd[index]==NULL) po@Agyg5  
     continue; 3|Y2BA d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 0dW*].Gi:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); m*'hHt n  
   } 'm^]X3y*  
  } 7 -S?U~s  
 } +z|@K=d#|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); e'A 1%g)  
} #h}a   
d6e$'w@(\T  
BOOL InitHotkey() M2Jb<y]  
{ hem>@Bp'V  
 if(hHook!=NULL){ B:96E&  
  nHookCount++; 7{lWg x  
  return TRUE; Aa+<4 R  
 } kx,3[qe'S  
 else 37 b6w6{D  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 5t,X;  
  if(hHook!=NULL) i`}!<{k  
   nHookCount++; az[#q  
  return (hHook!=NULL); '{w[).c.  
} N u3B02D*  
BOOL UnInit() ?sv[vR(  
{ `96MXP  
 if(nHookCount>1){ z |8zNt Ug  
  nHookCount--; VG_xNM  
  return TRUE; w>e+UW25Y  
 } NG8 F'=<  
 BOOL unhooked = UnhookWindowsHookEx(hHook); b}&.IJ&40j  
 if(unhooked==TRUE){ /@64xrvIl=  
  nHookCount=0; VwKfM MI8  
  hHook=NULL; MZ?+I~@  
 } TVF:z_M9  
 return unhooked; hmB`+?,z*  
} @<3kj R?j  
twhT6wz"  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :JU$ 6  
{ ; +1ooeU  
 BOOL bAdded=FALSE; d&lT/S  
 for(int index=0;index<MAX_KEY;index++){ S$=caZ?  
  if(hCallWnd[index]==0){ -/:!AxIH  
   hCallWnd[index]=hWnd; NiYT%K%  
   HotKey[index]=cKey; 5<M$ XT  
   HotKeyMask[index]=cMask; +;,X?E]g  
   bAdded=TRUE; d;nk>6<|  
   KeyCount++; RI<&cgWn+<  
   break; R*?!xDJ  
  } ^Y%<$IFG  
 } 6_&S ?yA  
 return bAdded; vdh[%T,&  
} V 4&a+MJ@  
%]1te*_  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |]~],  
{ mQ9y{}t=4  
 BOOL bRemoved=FALSE; Aho-\9/x%  
 for(int index=0;index<MAX_KEY;index++){ mV0u:ws  
  if(hCallWnd[index]==hWnd){ 7x]q>Y8T  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -jzoGzC3  
    hCallWnd[index]=NULL; U]W "  
    HotKey[index]=0; 26p_fKY  
    HotKeyMask[index]=0; y@SI)&D  
    bRemoved=TRUE; klMpiy  
    KeyCount--; KGGnypx`  
    break; b2H -D!YO^  
   } 0p+3 6g  
  } kjDmwa+91T  
 } Nza@6nI"  
 return bRemoved; >2v<;.  
} X|yVRQ?F`  
6n|][! f  
void VerifyWindow() _S,UpR~2W  
{ Gx*B(t]4y  
 for(int i=0;i<MAX_KEY;i++){ k;K-6<^h  
  if(hCallWnd!=NULL){ 8|nc( $}~  
   if(!IsWindow(hCallWnd)){ x`Wb9[u8  
    hCallWnd=NULL; &Ez+4.srkh  
    HotKey=0; Q!r&vQ/g  
    HotKeyMask=0; ^Rtxef  
    KeyCount--; IBUFXzl  
   } h;@>E:4Tg  
  } @yj~5Gf(j  
 } :2V|(:^ '  
} 7'gk=MQc  
hkRqtpYK  
BOOL CHookApp::InitInstance() OdO n wY  
{ /([a%,DI  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^M\X/uq$E  
 hins=AfxGetInstanceHandle(); \}\# fg  
 InitHotkey(); O`I}Lg]~q  
 return CWinApp::InitInstance(); ~~O4!|t  
} 6ma.FvSIM  
A]1dR\p  
int CHookApp::ExitInstance() BSy{"K*M  
{ O0s,)8+z5D  
 VerifyWindow(); W*?qOq {  
 UnInit(); F'"-aB ~  
 return CWinApp::ExitInstance(); S;u.Ds&  
} 4 9HP2E  
qL <@PC.5  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file i3pOGa<  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ^y%8_r&  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ JDW/Mc1bh  
#if _MSC_VER > 1000 ?]aVRmL  
#pragma once  8hYl73#  
#endif // _MSC_VER > 1000 ?2R!n" m-d  
g}IOHE  
class CCaptureDlg : public CDialog zl|+YjR  
{ Qn~{TZz  
 // Construction \y6Y}Cv  
 public: ko|M2\  
  BOOL bTray; _v(5vx_ {  
  BOOL bRegistered; p8"C`bCf  
  BOOL RegisterHotkey(); cm!|A?-<  
  UCHAR cKey; .l|29{J  
  UCHAR cMask; stMxlG"d  
  void DeleteIcon(); tc{l?7P  
  void AddIcon(); NJmx(!Xsh  
  UINT nCount; vE1:;%Q  
  void SaveBmp(); 45x4JG  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ROvY,-?  
  // Dialog Data ~*J <lln  
  //{{AFX_DATA(CCaptureDlg) Dm$SW<!l|  
  enum { IDD = IDD_CAPTURE_DIALOG }; 4.Fh4Y:$'  
  CComboBox m_Key; /sn }Q-Zy2  
  BOOL m_bControl; mY[*Cj3WJ  
  BOOL m_bAlt; atW^^4 :  
  BOOL m_bShift; t~)4f.F:  
  CString m_Path; nE?:nJ|%E  
  CString m_Number; WncHgz  
  //}}AFX_DATA /Dyig  
  // ClassWizard generated virtual function overrides \Ui8gDJ8y5  
  //{{AFX_VIRTUAL(CCaptureDlg) )T?BO  
 public: OH@gwC  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 2Nx:Y+[  
 protected: 9P,[MZ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JG&E"j#q  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 6`%|-o :  
  //}}AFX_VIRTUAL LpI4R  
  // Implementation %%I:L~c  
 protected: bKsEXS  
  HICON m_hIcon;  DZ4gp  
  // Generated message map functions 9Y2.ob!$}  
  //{{AFX_MSG(CCaptureDlg) D=Nt 0y  
  virtual BOOL OnInitDialog(); .mg0L\  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); P)XR9&o':  
  afx_msg void OnPaint(); 9G"4w`P  
  afx_msg HCURSOR OnQueryDragIcon(); :4x6dYNU  
  virtual void OnCancel(); u\/TR#b  
  afx_msg void OnAbout(); 1 <m.Q*  
  afx_msg void OnBrowse(); TaaCl#g$?  
  afx_msg void OnChange(); 3sIdwY)ZS_  
 //}}AFX_MSG '4D7:  
 DECLARE_MESSAGE_MAP() *3OlWnZ?  
}; d>T8V(Bb  
#endif /;:4$2R(;  
vO53?vN[m9  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `c|H^*RC  
#include "stdafx.h" Wb#<ctM>  
#include "Capture.h" L>&{<M_  
#include "CaptureDlg.h" pAq PHD=  
#include <windowsx.h> O*lIZ,!n  
#pragma comment(lib,"hook.lib") <AiE~l| D  
#ifdef _DEBUG ]&B/rSC  
#define new DEBUG_NEW [6 "5  
#undef THIS_FILE HRQfT>"/  
static char THIS_FILE[] = __FILE__; V$:%CIn  
#endif b|may/xWH  
#define IDM_SHELL WM_USER+1 %rf6 >  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); __1Hx?f  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \TnK<83  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; U%Hcc k'  
class CAboutDlg : public CDialog nv7)X2jja  
{ }sJ}c}b  
 public: 4~ &X]/_'  
  CAboutDlg(); YHke^Ind  
  // Dialog Data (CtRU   
  //{{AFX_DATA(CAboutDlg) *a0#PfS[  
  enum { IDD = IDD_ABOUTBOX }; aIr"!. 4  
  //}}AFX_DATA Sn 7 h$  
  // ClassWizard generated virtual function overrides k2_y84;D  
  //{{AFX_VIRTUAL(CAboutDlg) I2NMn5>  
 protected: [} d39  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support EZVgTySd  
  //}}AFX_VIRTUAL p2fzbBt  
  // Implementation t$p%UyVE  
 protected: LaZ @4/z!  
  //{{AFX_MSG(CAboutDlg) |Q@(<'8=  
  //}}AFX_MSG cVarvueS  
  DECLARE_MESSAGE_MAP() BeD>y@ it  
}; R<hsG%BS(D  
0S }\ML  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 4PR&67|AH_  
{ V?>&9D"m  
 //{{AFX_DATA_INIT(CAboutDlg) k8SY=HP  
 //}}AFX_DATA_INIT %s5( ''a.  
} 33a}M;vx  
y5D3zqCG  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) JDp=w,7LF  
{ gxe u2 HG  
 CDialog::DoDataExchange(pDX); nE0I[T(  
 //{{AFX_DATA_MAP(CAboutDlg) :uqEGnEut  
 //}}AFX_DATA_MAP .b!HEi<F  
} x>Dix1b:.  
5p-vSWr !  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +# !?+'A  
 //{{AFX_MSG_MAP(CAboutDlg) BLt_(S?Z`  
 // No message handlers : Q2=t!  
 //}}AFX_MSG_MAP usu{1&g  
END_MESSAGE_MAP() q[Ey!h)xq  
zW hzU|=8  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) aW;)-0+  
: CDialog(CCaptureDlg::IDD, pParent) t-iQaobF  
{ }dqOE-"I"n  
 //{{AFX_DATA_INIT(CCaptureDlg) .vIRz-S  
  m_bControl = FALSE; &$#NV@  
  m_bAlt = FALSE; vfVF^ WOd  
  m_bShift = FALSE; ' %rn-|)  
  m_Path = _T("c:\\"); e(OKE7  
  m_Number = _T("0 picture captured."); .lI.I  
  nCount=0; nJ1<8 p  
  bRegistered=FALSE; F4~O-g.<  
  bTray=FALSE; RUut7[r  
 //}}AFX_DATA_INIT p_fsEY  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 LJ9#!r@H  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); =+<DNW@%  
} Wh"xt:  
~H[_=  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 9I#a{%A:  
{ .#K\u![@N  
 CDialog::DoDataExchange(pDX); <~svy)Cz  
 //{{AFX_DATA_MAP(CCaptureDlg) Xg;<?g?k  
  DDX_Control(pDX, IDC_KEY, m_Key); y.gNjc  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ;7JyL|2  
  DDX_Check(pDX, IDC_ALT, m_bAlt); us<dw@P7{  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Y9%zo~]-W'  
  DDX_Text(pDX, IDC_PATH, m_Path); c"Q9ob  
  DDX_Text(pDX, IDC_NUMBER, m_Number); (9] =;)  
 //}}AFX_DATA_MAP $%ztP Ta  
} D*_. 4I  
"CFU$~  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) /R( .7N  
//{{AFX_MSG_MAP(CCaptureDlg) \ 9sJ`,T?  
 ON_WM_SYSCOMMAND() NjdDImz.;s  
 ON_WM_PAINT() 1pN8,[hyR7  
 ON_WM_QUERYDRAGICON() {t:*Xu  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) MQy,[y7I  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) EIg:@o&Jj  
 ON_BN_CLICKED(ID_CHANGE, OnChange) k^s7s{  
//}}AFX_MSG_MAP B7%m7GM  
END_MESSAGE_MAP() THy   
,W_".aguX  
BOOL CCaptureDlg::OnInitDialog() nA=E|$1  
{ v|jwz.jM  
 CDialog::OnInitDialog(); 3XUsw1,[  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9IacZ  
 ASSERT(IDM_ABOUTBOX < 0xF000); uw`J5TND  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 1vq c8lC  
 if (pSysMenu != NULL) w'mn O'%  
 { />7G  
  CString strAboutMenu; UVsF !0  
  strAboutMenu.LoadString(IDS_ABOUTBOX); fnFI w=d  
  if (!strAboutMenu.IsEmpty()) 1=~##/at  
  { `YBHBTG'o!  
   pSysMenu->AppendMenu(MF_SEPARATOR); `#j;\  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); PBwKRD[I  
  } xP'"!d4^i  
 } ytfr'sr/  
 SetIcon(m_hIcon, TRUE); // Set big icon 9~l8QaK  
 SetIcon(m_hIcon, FALSE); // Set small icon xR&Le/3+  
 m_Key.SetCurSel(0); 1nE`Wmo.2  
 RegisterHotkey(); <bywi2]z  
 CMenu* pMenu=GetSystemMenu(FALSE); -t125)6I  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 99b"WH^3$y  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Bv6~!p  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 0F &(}`V  
 return TRUE; // return TRUE unless you set the focus to a control S;nlC  
} id1gK(F8H  
'puiahA  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) .bRDz:?j  
{ bHz H0v]:  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) cNl$ vP83z  
 { -e*(+  
  CAboutDlg dlgAbout; - KaU@t  
  dlgAbout.DoModal();  LD}<|  
 } ovvg"/>L  
 else 7X.B  
 { V?jot<|$  
  CDialog::OnSysCommand(nID, lParam); o& ?:pE  
 } l<s6Uu"  
} <VT|R~  
okbW.  ~  
void CCaptureDlg::OnPaint() ( D@ U%  
{ Qf}}/k|)k  
 if (IsIconic()) TM,Fab &  
 { g6.Tx]?b$  
  CPaintDC dc(this); // device context for painting e:|Bn>*  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); GVM)-Dp]  
  // Center icon in client rectangle FyllVrK  
  int cxIcon = GetSystemMetrics(SM_CXICON); }eLth0d`'o  
  int cyIcon = GetSystemMetrics(SM_CYICON); 73+)> "x>  
  CRect rect; H4ancmy  
  GetClientRect(&rect); $~1~+s0$  
  int x = (rect.Width() - cxIcon + 1) / 2; e:n3@T,R  
  int y = (rect.Height() - cyIcon + 1) / 2;  U%tpNWB  
  // Draw the icon @$o^(my  
  dc.DrawIcon(x, y, m_hIcon); ygqWy1C  
 } y,$zSPJCi  
 else .:SY:v r  
 { ?]58{O(?c  
  CDialog::OnPaint(); 9XN/ w p  
 } :b(Nrj&TQ[  
} H+VjY MvK  
z?C& ,mv  
HCURSOR CCaptureDlg::OnQueryDragIcon() 5oOFl  
{ l}9E0^AS  
 return (HCURSOR) m_hIcon; Yj*!t1qm  
} BPypjS0?8  
a]?o"{{+  
void CCaptureDlg::OnCancel() p9*Ak U&]  
{ Q^oB`)k  
 if(bTray) p+xjYU4^C  
  DeleteIcon(); 7)l+h Z  
  CDialog::OnCancel(); "jP{m; p  
} C\1x3  
`4t*H>:y  
void CCaptureDlg::OnAbout() 5uL!Ae  
{ $1bzsB|^  
 CAboutDlg dlg; |@pn=wW  
 dlg.DoModal(); c+G%o8  
} sN@=Ri?\  
ko`KAU<T_  
void CCaptureDlg::OnBrowse() SfGl*2  
{ ?w>-ya  
 CString str; /jd.<r=_I  
 BROWSEINFO bi; 4cJka~  
 char name[MAX_PATH]; 'a=QCO 0  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); xdrs!GV:  
 bi.hwndOwner=GetSafeHwnd();  *#sY-Gd  
 bi.pszDisplayName=name; )'axJ  
 bi.lpszTitle="Select folder"; ~x g#6%<=  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; f9?f!k  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); =(p]L  
 if(idl==NULL) dC 8,  
  return; )L$)qfQ~x  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >~rytg]f  
 str.ReleaseBuffer(); A=\:b^\  
 m_Path=str; C dTE~O<)  
 if(str.GetAt(str.GetLength()-1)!='\\') &u9@FFBT8  
  m_Path+="\\"; n~?n+\.&a  
 UpdateData(FALSE); *ZV=4[#bT  
} +o}mV.&1,  
]Jx_bs~g  
void CCaptureDlg::SaveBmp() =g$>]AE  
{ }/.GB5Ej  
 CDC dc; [> LL  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); sx@ %3j  
 CBitmap bm; FYX" q-Z  
 int Width=GetSystemMetrics(SM_CXSCREEN); p JM&R<i:  
 int Height=GetSystemMetrics(SM_CYSCREEN); _|s'0F/t  
 bm.CreateCompatibleBitmap(&dc,Width,Height); bt 0Q6v5  
 CDC tdc; ~zL DLr=  
 tdc.CreateCompatibleDC(&dc); G q2@37U  
 CBitmap*pOld=tdc.SelectObject(&bm); 9=p/'d8  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 0z`-fQfK  
 tdc.SelectObject(pOld); L31#v$;4  
 BITMAP btm; ]5:0.$5  
 bm.GetBitmap(&btm); 8\$ u/(DX  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; m 9.BU2.  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); L IRdWGQ4  
 BITMAPINFOHEADER bih; jLF,R7t  
 bih.biBitCount=btm.bmBitsPixel; mD go@ f  
 bih.biClrImportant=0; wdQ%L4l  
 bih.biClrUsed=0; ngC^@*XAw9  
 bih.biCompression=0; 0E/,l``p  
 bih.biHeight=btm.bmHeight; +L|-W9"@3  
 bih.biPlanes=1; %p8#pt\$7  
 bih.biSize=sizeof(BITMAPINFOHEADER); w)xfP^M#  
 bih.biSizeImage=size; m53~Ysq<  
 bih.biWidth=btm.bmWidth; d9.~W5^fC  
 bih.biXPelsPerMeter=0; m-MfFEZ  
 bih.biYPelsPerMeter=0; "aJf W  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Q;0 g  
 static int filecount=0; th`pf   
 CString name; }BJR/r  
 name.Format("pict%04d.bmp",filecount++); D;+sStZK3  
 name=m_Path+name; +$ 0wBU  
 BITMAPFILEHEADER bfh; 4LkW`Sbm  
 bfh.bfReserved1=bfh.bfReserved2=0; /=S\v<z  
 bfh.bfType=((WORD)('M'<< 8)|'B'); &v g[k#5  
 bfh.bfSize=54+size; 8m 5T  
 bfh.bfOffBits=54; -^&NwLEv=  
 CFile bf; HAdDr!/`  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ YzeNr*  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ID8u&:  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); U\x $@J  
  bf.WriteHuge(lpData,size); 6QG"~>v7'(  
  bf.Close(); WADAp\&  
  nCount++; ){$*<#&H  
 } S$ Z?T  
 GlobalFreePtr(lpData); }ISc^W) t  
 if(nCount==1) VrnZrQj<  
  m_Number.Format("%d picture captured.",nCount); Ktn:6=,  
 else #-8%g{  
  m_Number.Format("%d pictures captured.",nCount); pra0:oHN  
  UpdateData(FALSE); o&:'MwU  
} JbLHW26pl  
i.0.oy>  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ['Y"6[1  
{ }5]7lGR  
 if(pMsg -> message == WM_KEYDOWN) 9oTtH7%  
 { 7)dCdO  
  if(pMsg -> wParam == VK_ESCAPE) B*AB@  
   return TRUE; o3(:R0  
  if(pMsg -> wParam == VK_RETURN) JXF0}T)C  
   return TRUE; !YENJJ  
 } cN%@ nW0i  
 return CDialog::PreTranslateMessage(pMsg); 1}ws@hU  
} OZ6:u^OS]  
xt1Ug~5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) pmgPBiU>  
{ ~UQX t r  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ LW!>_~g-  
  SaveBmp(); %abc -q  
  return FALSE; i>%A0.9  
} (DY&{vudF  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]\(Ho  
 CMenu pop; \IO<V9^L  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); AfvIzsT0  
 CMenu*pMenu=pop.GetSubMenu(0); L*(`c cU  
 pMenu->SetDefaultItem(ID_EXITICON); G|.6%-  
 CPoint pt; #&K?N  
 GetCursorPos(&pt); Ox9M![fC  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); UOn:@Qn  
 if(id==ID_EXITICON) !Wz4BBU8o  
  DeleteIcon(); `CY c>n"  
 else if(id==ID_EXIT) WYd9p;k  
  OnCancel(); dry>TXG*  
 return FALSE; "X \Yp_g  
} W?<<al*  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -1}&\=8M  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) +,T z +!  
 AddIcon(); >9<YQ(  
 return res; B ,U|V  
} 9Xh1i`.D  
;*njS1@  
void CCaptureDlg::AddIcon() uP$C2glyz  
{ rVZlv3  
 NOTIFYICONDATA data; tP4z#0r2  
 data.cbSize=sizeof(NOTIFYICONDATA); 9xaieR  
 CString tip; @ )Nw>/; o  
 tip.LoadString(IDS_ICONTIP); 6o&ZS @  
 data.hIcon=GetIcon(0); `APeS=< &  
 data.hWnd=GetSafeHwnd(); G.]'pn  
 strcpy(data.szTip,tip); A$70!5*  
 data.uCallbackMessage=IDM_SHELL; bMB*9<c~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .~X&BY>qP  
 data.uID=98; KW(^-:wmr  
 Shell_NotifyIcon(NIM_ADD,&data); oaG;i51!  
 ShowWindow(SW_HIDE); 5QP`2I_n  
 bTray=TRUE; &[P(}??Y\  
} )3.=)?XW  
[xo-ZDIoG  
void CCaptureDlg::DeleteIcon() {Kz!)uaC  
{ Tly*i"[&  
 NOTIFYICONDATA data; SvQ!n4 $  
 data.cbSize=sizeof(NOTIFYICONDATA); *yYeqm  
 data.hWnd=GetSafeHwnd(); 8(g}/%1mt3  
 data.uID=98; p# JPLCs  
 Shell_NotifyIcon(NIM_DELETE,&data); _6-N+FI  
 ShowWindow(SW_SHOW); HT7I~]W  
 SetForegroundWindow(); -f["1-A  
 ShowWindow(SW_SHOWNORMAL); )zkr[;j~`  
 bTray=FALSE; S/dj])g  
} yM('!iG*/  
GD% qrK?  
void CCaptureDlg::OnChange() {9v Mc  
{ .f&Z+MQ  
 RegisterHotkey(); Hi nJ}MF  
} T&'LQZM8  
CbFO9q  
BOOL CCaptureDlg::RegisterHotkey() :+f6:3  
{ +]p/.- Uw  
 UpdateData();  E]W :  
 UCHAR mask=0; )M* Sg?L  
 UCHAR key=0; %xA-j]%?ep  
 if(m_bControl) %k @4}M>  
  mask|=4; $}B&u)  
 if(m_bAlt) !uP8powO  
  mask|=2; pZKK7   
 if(m_bShift) !m8T< LtMl  
  mask|=1; 2=,d.1E3d  
  key=Key_Table[m_Key.GetCurSel()]; Vg}+w Nt5  
 if(bRegistered){ cN`P5xP'  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); VFq7nV/O  
  bRegistered=FALSE; IV~5Y{(l  
 } XZrzG P(  
 cMask=mask; !X`cNd)0Xo  
 cKey=key; mc4|@p*  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 39A|6>-?  
 return bRegistered; lib}dk  
} T?CQgVR  
+wfZFJ:1l  
  四、小结 A<IV"bo  
+mN8uU~(kx  
  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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