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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: ^^n (s_g  
  gq4X(rsyD  
  一、实现方法 ,&fZo9J9  
i\DU<lD5VN  
  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: >#gDk K  
.N# KW  
#pragma data_seg("shareddata") vg"*%K$a  
HHOOK hHook =NULL; //钩子句柄 p=kt+H&;  
UINT nHookCount =0; //挂接的程序数目 suFk<^3  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 WIAukM8~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 k{hNv|:,  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey BnDCK@+|Q  
static int KeyCount =0; ^ZRZ0:rZ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 GZn=Hgv8  
#pragma data_seg() K_:2sDCaN  
|b^UPrz)VS  
  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。 $A/?evJi8R  
d%nX;w,  
  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: 4%_xT o  
.!i`YT*jF  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR wa`c3PQGu  
cKey,UCHAR cMask) %XZhSmlf  
{ _ yDDPuAi  
 BOOL bAdded=FALSE; o-AF_N  
 for(int index=0;index<MAX_KEY;index++){ ]ZW-`UMO  
  if(hCallWnd[index]==0){ |B'4wF>  
   hCallWnd[index]=hWnd; $"MVr5q6  
   HotKey[index]=cKey; -XK;B--c  
   HotKeyMask[index]=cMask; 3u+i  
   bAdded=TRUE; EAxdF u  
   KeyCount++; WB<MU:.Vc  
   break; yx*<c#Uf  
  } t y4R2LnC  
 } ro3%VA=V  
 return bAdded; #N~1Y e  
} nG{o$v_|  
//删除热键 5~im.XfiVx  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q00v(6V46  
{ :(" @U,  
 BOOL bRemoved=FALSE; sX*L[3!vN  
 for(int index=0;index<MAX_KEY;index++){ 4sBvW  
  if(hCallWnd[index]==hWnd){ E $W0HZ'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ .)p%|A#^  
    hCallWnd[index]=NULL; -AolW+Y  
    HotKey[index]=0; y9LO;{(  
    HotKeyMask[index]=0; f4F%\ "  
    bRemoved=TRUE; n6M#Xc'JA  
    KeyCount--;  s_+.xIZ  
    break; F;kKn:XL  
   } Br42Qo2"T>  
  } VN\VTSZh?\  
 } v"mZy,u  
 return bRemoved; &5z9C=]e  
} 6X?:mn'%QF  
![fNlG!r  
?U O aqcL  
  DLL中的钩子函数如下: {cO8q }L  
' u;Zw%O(J  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @3=q9ftm  
{ yJ ljCu)f  
 BOOL bProcessed=FALSE; SyT{k\[  
 if(HC_ACTION==nCode) 8t) g fSG  
 { 1w7XM0SHcn  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 jENC1T(  
   switch(wParam) x2r.4  
   {  BSB&zp  
    case VK_MENU: q bCU&G|)  
     MaskBits&=~ALTBIT; f1elzANy  
     break; :PY6J}:&#  
    case VK_CONTROL: 1CSGG'J]E  
     MaskBits&=~CTRLBIT; ]\oT({$6B  
     break; 1;i|GXY:h  
    case VK_SHIFT: mh`uvqY  
     MaskBits&=~SHIFTBIT; ur=:Ha  
     break; mW+5I-~  
    default: //judge the key and send message 0 z]H=  
     break; J P5en  
   } $/5\Hg1  
   for(int index=0;index<MAX_KEY;index++){ eOkiB!G.  
    if(hCallWnd[index]==NULL) nHQ *#&$  
     continue; .XRe:\8mc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @'GPZpbvZ  
    { F?6Q(mRl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (NDC9Lls  
     bProcessed=TRUE; J4U_utp  
    } h x8pg,X  
   } Tp.]{*  
  } .3VL  
  else if((lParam&0xc000ffff)==1){ //有键按下 e>.^RtDF  
   switch(wParam) %hw4IcWJ|  
   { K IR3m )  
    case VK_MENU: LpSF*xm  
     MaskBits|=ALTBIT; zxD=q5in  
     break; [Ob'E!;<  
    case VK_CONTROL: L+T7Ge q  
     MaskBits|=CTRLBIT; "L1LL iS  
     break; ?TIi0;h  
    case VK_SHIFT: 55UPd#E'  
     MaskBits|=SHIFTBIT; K :+q9;g  
     break; Bt5 P][<  
    default: //judge the key and send message WPlf8* -fQ  
     break; 7ncR2-{g  
   } pR=R{=}wV  
   for(int index=0;index<MAX_KEY;index++){ A{k1MA<F6  
    if(hCallWnd[index]==NULL) 8;c\} D  
     continue; Qp)?wny4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |`Yn'Mj8rm  
    { {Oq8A.daJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Ruq>+ }4  
     bProcessed=TRUE; A #m_w*  
    } N;BuBm5K  
   } 1>Vq<z  
  } v6Y[_1  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 rz-61A) _  
   for(int index=0;index<MAX_KEY;index++){ K`uPPyv  
    if(hCallWnd[index]==NULL) Nq\)o{<1  
     continue; CR2.kuM0~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) G %\/[ B  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); &DHIYj1 i  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 P2iuB|B@  
   } *zDDi(@vtK  
  } /-m)  
 } c;-N RvVb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); FwHqID_!:l  
} Tz.okCo]z  
j)@{_tv6;  
  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: ;;XY&J  
bwP@}(K  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Hg8 4\fA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bj 8pqw|;  
z7L+wNYwg  
  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: !wfUD2 K1  
.f;@O qU  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) u*uHdV5  
{ =_g#I  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) i ps)-1  
 { #902x*Z'c"  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 R+e)TR7+  
  SaveBmp(); Dd/]?4  
  return FALSE; 9n_Rk W5g  
 } =A{'57yP  
 …… //其它处理及默认处理 *)I^+zN  
} >+.GBf<E  
Uam %u  
UWS 91GN@  
  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。 m-;8O /  
}Y!s:w#  
  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。 ?MmQ'1N  
)p>p3b g  
  二、编程步骤 u>agVB4\F  
DTo"{!  
  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"; "$K]+0ryG<  
Z1+Ewq3m  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; !TY0;is  
(a-Lx2T  
  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; qp#Euq6  
V51kX{S  
  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;1[_~  
_1Ne+"V  
  5、 添加代码,编译运行程序。 f? GoBh<  
$ve$Sq  
三、程序代码 i[FYR;C  
~]?EV?T  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL KydAFxUb  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) \T<F#a  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ i;]# @n|  
#if _MSC_VER > 1000 !Icznou\  
#pragma once DKem;_6OQ  
#endif // _MSC_VER > 1000 jTV4iX  
#ifndef __AFXWIN_H__ J.U%W}Hx  
#error include 'stdafx.h' before including this file for PCH aUc#,t;Qd  
#endif a|4D6yUw|  
#include "resource.h" // main symbols n&|N=zh  
class CHookApp : public CWinApp B^zg#x#8  
{ Lyn{Uag  
 public: ;~[}B v  
  CHookApp(); Z02EE-A  
  // Overrides xw_$1 S  
  // ClassWizard generated virtual function overrides SK@ p0:  
  //{{AFX_VIRTUAL(CHookApp) }2m>S6""A  
 public: 9xw"NcL  
  virtual BOOL InitInstance(); dBovcc  
  virtual int ExitInstance(); H_x} -  
  //}}AFX_VIRTUAL V:P]Ved  
  //{{AFX_MSG(CHookApp) ; qbK[3.  
  // NOTE - the ClassWizard will add and remove member functions here. A:z  
  // DO NOT EDIT what you see in these blocks of generated code ! 52Dgul  
  //}}AFX_MSG 5A|d hw   
  DECLARE_MESSAGE_MAP() wmXI8'~F&  
}; z-g6d(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); u(f;4`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +|pYu<OY  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); gae=+@z  
BOOL InitHotkey(); 5T(cy  
BOOL UnInit(); ZPq.|6&  
#endif gV\Y>y4v  
ZfVY:U:o>  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 6|3 X*Orn  
#include "stdafx.h" ohJDu{V  
#include "hook.h" M}CxCEdDB]  
#include <windowsx.h> ,C 0y3pL  
#ifdef _DEBUG 6w m-uu  
#define new DEBUG_NEW D/4]r@M2c  
#undef THIS_FILE I!1+#0SG  
static char THIS_FILE[] = __FILE__; Lpkx$QZ  
#endif $XMpC{  
#define MAX_KEY 100 l=Pw yJ  
#define CTRLBIT 0x04 Pw7uxN`  
#define ALTBIT 0x02 P,WQN[(+  
#define SHIFTBIT 0x01 <}8G1<QZ'.  
#pragma data_seg("shareddata") S0:Oep   
HHOOK hHook =NULL; k&f/f  
UINT nHookCount =0; |#yT]0L%pA  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey CAom4 Sp'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT {TJBB/B1  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey `D=`xSEYl  
static int KeyCount =0; sN?Rx}  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ?YV#  K  
#pragma data_seg() `T7TWv"M  
HINSTANCE hins; /4;A.r`;  
void VerifyWindow(); I2SH j6 -  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) o&z[d  
//{{AFX_MSG_MAP(CHookApp) DS7L}]  
// NOTE - the ClassWizard will add and remove mapping macros here. e m)%U  
// DO NOT EDIT what you see in these blocks of generated code! l;R8"L:,p\  
//}}AFX_MSG_MAP U,6sR  
END_MESSAGE_MAP() ,`YBTU  
\QF0(*!!  
CHookApp::CHookApp() 5=<KA   
{ ~$j;@ 4  
 // TODO: add construction code here, A<TYt M  
 // Place all significant initialization in InitInstance Yh@2m9  
} A8ef=ljM?  
k4u/v n`&r  
CHookApp theApp; qP##C&+#q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) J65:MaS  
{ m8R=wb :  
 BOOL bProcessed=FALSE; j)YX=r;xM  
 if(HC_ACTION==nCode) "_dg$j`Y&&  
 { o:3(J}  
  if((lParam&0xc0000000)==0xc0000000){// Key up Jmg9|g!f  
   switch(wParam) `VUJW]wGu  
   { x^pt^KR;  
    case VK_MENU: #G`K<%{?f  
     MaskBits&=~ALTBIT; 5VQ-D`kE+  
     break; H8dS]N~[Y  
    case VK_CONTROL: =2NrmwWZs  
     MaskBits&=~CTRLBIT; W+U0Y,N6  
     break; }gt)cOaY  
    case VK_SHIFT: birc&<  
     MaskBits&=~SHIFTBIT; -U A &Zt  
     break; JXq!v:w6  
    default: //judge the key and send message B)L0hi  
     break; 'r\RN\PT  
   } I^u~r.  
   for(int index=0;index<MAX_KEY;index++){ -Eq[J k  
    if(hCallWnd[index]==NULL) `#8kJt  
     continue; l Ib d9F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =&9c5"V&  
    { |pG0 .p4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); BOcD?rrZ0  
     bProcessed=TRUE; p9u'nDi  
    } R4JfH  
   } /QVwZrch  
  } K\8zhY  
  else if((lParam&0xc000ffff)==1){ //Key down U:3O E97  
   switch(wParam) I_Gz~qk6  
   { mD&I6F[s  
    case VK_MENU: !.t D.(XP  
     MaskBits|=ALTBIT; 74:~F)BP  
     break; rKFnivGT  
    case VK_CONTROL: Y3(MKq  
     MaskBits|=CTRLBIT; BKb#\(95*  
     break; $U9]v5  
    case VK_SHIFT: j3N d4#  
     MaskBits|=SHIFTBIT; N|>JLZ>  
     break; .QZjJ9pvK  
    default: //judge the key and send message /BQqg0 8@L  
     break; Umzb  
   } #>,E"-]f  
   for(int index=0;index<MAX_KEY;index++) 6aHD?a o  
   { -\;0gnf{J  
    if(hCallWnd[index]==NULL) t0@AfO.'1  
     continue; Jp}\@T.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5p:BHw;%;  
    { IpSWg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); YwF&-~mp7n  
     bProcessed=TRUE; )1Y?S;  
    } lz<' L. .  
   } Ev7v,7`z  
  } w $-q&  
  if(!bProcessed){ *) T"-}F  
   for(int index=0;index<MAX_KEY;index++){ /J/V1dC}]D  
    if(hCallWnd[index]==NULL) ]d7A|)q  
     continue; 8Yf*vp>T/x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -vT{D$&1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \-[bU6\A\  
   } }79jyS-e  
  } 2\z|/ Q  
 } dW!El^w}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "M[&4'OM  
} zp}pS2DU  
]adgOlM  
BOOL InitHotkey() ry=8Oq&[~  
{ L*,h=#x(  
 if(hHook!=NULL){ H&p:  
  nHookCount++; /^k%sG@?  
  return TRUE; A/UOcl+N  
 } dhnX\/  
 else !y/e Fx  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); vazA@|^8  
  if(hHook!=NULL) Y`eF9Im,  
   nHookCount++; "!AtS  
  return (hHook!=NULL); =SeQ- H#  
} !o?&{"#+  
BOOL UnInit() jIrfJ*z  
{ $':5uU1}  
 if(nHookCount>1){ T|D^kL%m!  
  nHookCount--; jN*wbqL  
  return TRUE; {J,"iJKop  
 } ^0}wmxDq  
 BOOL unhooked = UnhookWindowsHookEx(hHook); js Z"T  
 if(unhooked==TRUE){ RN[x\",  
  nHookCount=0; lMu-,Z="  
  hHook=NULL; ,tg]Gt  
 } $MwBt  
 return unhooked; fmQif]J;;  
} FGyrDRDwC  
p_&B+ <z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) sZr \mQ~  
{ lZ[J1:%  
 BOOL bAdded=FALSE; ZX`x9/0&  
 for(int index=0;index<MAX_KEY;index++){ `5wiXsNjLY  
  if(hCallWnd[index]==0){ ED79a:  
   hCallWnd[index]=hWnd; U!c+i#:t  
   HotKey[index]=cKey; A- Abj'  
   HotKeyMask[index]=cMask; R13k2jLSQ  
   bAdded=TRUE; JeNX5bXW  
   KeyCount++; % 33O)<?  
   break; O#18a,o@  
  } &g23tT#P?  
 } WoGnJ0N q  
 return bAdded; G/},lUzLg  
} O-W[^r2e  
+6jGU '}[  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) q. Jx|x  
{ #rGCv~0*l  
 BOOL bRemoved=FALSE; @ %L  
 for(int index=0;index<MAX_KEY;index++){ lemV&$WN|  
  if(hCallWnd[index]==hWnd){ Z]TQ+9t  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Y%eW6Y#  
    hCallWnd[index]=NULL; ':_gYA  
    HotKey[index]=0; X o9vE3  
    HotKeyMask[index]=0; j?]+~  
    bRemoved=TRUE; fS|e{!iI"  
    KeyCount--; dJnKa]X  
    break; ~aQR_S  
   } sn^ 3xAF  
  } .|07IH/Di{  
 } =1R 2`H\  
 return bRemoved; =LK`m NA  
} .B2e$`s$  
^OIo  
void VerifyWindow() ^q/^.Gf  
{ ,P`GIGvkA  
 for(int i=0;i<MAX_KEY;i++){ Z`GEF|eh  
  if(hCallWnd!=NULL){ bf2n%-&9g  
   if(!IsWindow(hCallWnd)){ H*3u]Ebh  
    hCallWnd=NULL; Q#ksf h!D  
    HotKey=0; DA>nYj-s  
    HotKeyMask=0; 4]0:zS*O  
    KeyCount--; SC2LY  
   } StTxga|  
  } DO*6gzW  
 } ^ /%Y]d$  
} W|rAn2H  
*dBmb  
BOOL CHookApp::InitInstance() y $uq`FW  
{ b`S9#`  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); }93FWo.  
 hins=AfxGetInstanceHandle(); eX"Ecl{  
 InitHotkey(); z@\mn  
 return CWinApp::InitInstance(); vShB26b  
} )T gfd5B  
7p':a)  
int CHookApp::ExitInstance() . a @7  
{ +N+117m  
 VerifyWindow(); mr#.uhd.z  
 UnInit(); Fec4#}|  
 return CWinApp::ExitInstance(); { 6qxg_{  
} :PY8)39@K  
9 4lt?|3=  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file <im}R9eJ1  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) e<`?$tZ3   
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ >Jn`RsuV  
#if _MSC_VER > 1000 k$J!,!q  
#pragma once /=9dX; #  
#endif // _MSC_VER > 1000 GtIAsC03  
)y:))\>  
class CCaptureDlg : public CDialog R N@)nc_  
{ T>#~.4A0  
 // Construction BOM0QskLf  
 public: w?nSQBz$  
  BOOL bTray; w;AbJCv2  
  BOOL bRegistered; G^K;+&T  
  BOOL RegisterHotkey(); 4K`b?{){+a  
  UCHAR cKey; 3y2L! &'z  
  UCHAR cMask; [`tNa Vg  
  void DeleteIcon(); CA&VnO{r  
  void AddIcon(); [U^Cz{G  
  UINT nCount;  g;AW  
  void SaveBmp(); d*k5h<jM  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Rb:?%\=  
  // Dialog Data ]=xX_  
  //{{AFX_DATA(CCaptureDlg) &vN!>bR  
  enum { IDD = IDD_CAPTURE_DIALOG }; y ,`0f|  
  CComboBox m_Key; -p7 HQ/  
  BOOL m_bControl; 3jJV5J'"  
  BOOL m_bAlt; Zn)o@'{}{  
  BOOL m_bShift; -}oH],C  
  CString m_Path; ]qq2VO<b  
  CString m_Number; .Sa=VC?EZ  
  //}}AFX_DATA 0Db=/sJ>  
  // ClassWizard generated virtual function overrides HEa7!h[a'  
  //{{AFX_VIRTUAL(CCaptureDlg) zYdieE\-  
 public: ,`a8@  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Em{;l:;(W  
 protected: W}zq9|p  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3?_%|;ga  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 'BgR01w J  
  //}}AFX_VIRTUAL z/QYy)_j  
  // Implementation i7YUyU  
 protected: OR|Jc+LT  
  HICON m_hIcon; b~)2`l  
  // Generated message map functions E|_8#xvb  
  //{{AFX_MSG(CCaptureDlg) a7u*d`3X=  
  virtual BOOL OnInitDialog(); z}$.A9yn  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); En&gI`3n  
  afx_msg void OnPaint(); {dE(.Z?]!#  
  afx_msg HCURSOR OnQueryDragIcon(); PGYx] r  
  virtual void OnCancel(); $X\2h+ Os  
  afx_msg void OnAbout(); zO$r   
  afx_msg void OnBrowse(); {o*$|4q4  
  afx_msg void OnChange(); > MRuoJ  
 //}}AFX_MSG Jx`7W1%T  
 DECLARE_MESSAGE_MAP() +eLL)uk  
}; }jWg&<5+z  
#endif M5_ t#[ [  
`0q=Z],  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 7z/O#Fbs  
#include "stdafx.h" 4:b'VHW.  
#include "Capture.h" @PQd6%@  
#include "CaptureDlg.h" hPgYKa8u  
#include <windowsx.h> pSYEC,0B  
#pragma comment(lib,"hook.lib") SsfC m C  
#ifdef _DEBUG b^}U^2S%  
#define new DEBUG_NEW JlRNJ#h>  
#undef THIS_FILE WI&}94w  
static char THIS_FILE[] = __FILE__; .V UnOdI  
#endif eHd7fhW5  
#define IDM_SHELL WM_USER+1 }rs>B,=*k  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RVs=s}|>*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); psz0q|  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :+ 1Wmg  
class CAboutDlg : public CDialog Up_"qD6  
{ T;PLUjp}  
 public: -'*<;]P+.  
  CAboutDlg(); }:J-o  
  // Dialog Data "K+EZ%~<  
  //{{AFX_DATA(CAboutDlg) \&Bdi6xAy  
  enum { IDD = IDD_ABOUTBOX }; 9GTp};Kg  
  //}}AFX_DATA ,zK E$  
  // ClassWizard generated virtual function overrides ;3bUgI}.J  
  //{{AFX_VIRTUAL(CAboutDlg) 3QdCu<eBZ  
 protected: em- <V5fb  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support yO7#n0q  
  //}}AFX_VIRTUAL :c8d([)$  
  // Implementation a=9QwEZ  
 protected: o Qo5y_o~  
  //{{AFX_MSG(CAboutDlg) &Ll&A@yU  
  //}}AFX_MSG G)Y,*.,  
  DECLARE_MESSAGE_MAP() M&Ln'BC  
}; n:1Ijh 1  
e VQ-?DK  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) }*qj,8-9  
{ pDvznpQ  
 //{{AFX_DATA_INIT(CAboutDlg) 42}8es.aa  
 //}}AFX_DATA_INIT pW>{7pXn  
} PQh s^D  
!<~cjgdx  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) %@TC- xx  
{ P6'Se'f8  
 CDialog::DoDataExchange(pDX); qTMY]=(  
 //{{AFX_DATA_MAP(CAboutDlg) p:0X3?IG3  
 //}}AFX_DATA_MAP E2>+V{TF  
} \.Op6ECV9  
"{t]~urLd  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) asCcBp  
 //{{AFX_MSG_MAP(CAboutDlg) Q#K10*-O6  
 // No message handlers M,bs`amz  
 //}}AFX_MSG_MAP 2\T\p<_20  
END_MESSAGE_MAP() `QW=<Le?  
m_`%#$s}  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 'lu3BQvfh  
: CDialog(CCaptureDlg::IDD, pParent) )Z['=+s%  
{ _G25$%/LU  
 //{{AFX_DATA_INIT(CCaptureDlg) E7aG&K  
  m_bControl = FALSE; Xw7'I  
  m_bAlt = FALSE; * >8EMq\^  
  m_bShift = FALSE; I:UDEoQo  
  m_Path = _T("c:\\");  vP? T  
  m_Number = _T("0 picture captured."); ~gNFcJuy  
  nCount=0; {0-rnSjC  
  bRegistered=FALSE; Y}<%~z#.4  
  bTray=FALSE; YV@efPy}n  
 //}}AFX_DATA_INIT B##X94aTT  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Z;RUxe|<k  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); JAXD\StC  
} DGS,iRLnA  
qE]e+S?57a  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?N!kYTR%}  
{ ~#}T|  
 CDialog::DoDataExchange(pDX); b`=g#B|  
 //{{AFX_DATA_MAP(CCaptureDlg) 6qT-  
  DDX_Control(pDX, IDC_KEY, m_Key); rK:cUW0]X  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); y=EVpd  
  DDX_Check(pDX, IDC_ALT, m_bAlt); UEfY'%x  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); X|ZAC!J5>  
  DDX_Text(pDX, IDC_PATH, m_Path); =_ b/ g  
  DDX_Text(pDX, IDC_NUMBER, m_Number); j|!t3}((  
 //}}AFX_DATA_MAP MOnTp8   
} g]`YI5  
wEJzLFCn  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) v=cQ`nou  
//{{AFX_MSG_MAP(CCaptureDlg) 3T4HX|rC  
 ON_WM_SYSCOMMAND() n&?)gKL0g  
 ON_WM_PAINT() Dh?I   
 ON_WM_QUERYDRAGICON() 1KBGML-K3  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) S9r+Nsn  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) v_WQ<G?  
 ON_BN_CLICKED(ID_CHANGE, OnChange) )4c?BCgy  
//}}AFX_MSG_MAP R:R<Xt N`5  
END_MESSAGE_MAP() CgYX^h?Y9  
WW &Wh<4  
BOOL CCaptureDlg::OnInitDialog() mdEl CC0  
{ kLU-4W5t  
 CDialog::OnInitDialog(); DrC"M*$!  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ['sNk[-C  
 ASSERT(IDM_ABOUTBOX < 0xF000); N0vECk  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 9|v%bO  
 if (pSysMenu != NULL) }^p<Y5{b  
 { K :~tZ  
  CString strAboutMenu; mZPvG  
  strAboutMenu.LoadString(IDS_ABOUTBOX); j0a=v}j3  
  if (!strAboutMenu.IsEmpty()) a }*i [  
  { rPGj+wL5-  
   pSysMenu->AppendMenu(MF_SEPARATOR); /@\R  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); iemp%~UZ  
  } $gD8[NAIx=  
 } z0SF2L H  
 SetIcon(m_hIcon, TRUE); // Set big icon .Y^cs+-o  
 SetIcon(m_hIcon, FALSE); // Set small icon c:>&YGmhu  
 m_Key.SetCurSel(0); 8UqH"^9.Q7  
 RegisterHotkey(); xSSEDfq  
 CMenu* pMenu=GetSystemMenu(FALSE); tpO '<b  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,-8 -Y>[  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Q9xb7)G  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [A"=!e$<  
 return TRUE; // return TRUE unless you set the focus to a control GdVF;  
} jY]51B  
Gsb^gd  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) N)R5#JX  
{ *L$_80  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) " r o'?  
 { 1 ptyiy  
  CAboutDlg dlgAbout; [0]A-#J  
  dlgAbout.DoModal(); ZILJXX4  
 } "*F`,I3  
 else ~QxW^DGa7]  
 { B%MdJ D>  
  CDialog::OnSysCommand(nID, lParam); pq&[cA_w  
 } A8Fe@$<#8  
} Vd  d  
HK~SD:d  
void CCaptureDlg::OnPaint() W{tZX^|  
{ u;c WIRG  
 if (IsIconic()) i$PO#}  
 { #ye`vD  
  CPaintDC dc(this); // device context for painting gD4vV'|  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 6L$KMYHE  
  // Center icon in client rectangle 4"(rZWv  
  int cxIcon = GetSystemMetrics(SM_CXICON); 1PUZB`"3  
  int cyIcon = GetSystemMetrics(SM_CYICON); ,qv\Y]  
  CRect rect; L~Peerby  
  GetClientRect(&rect); *q k7e[IP  
  int x = (rect.Width() - cxIcon + 1) / 2; liH#=C8l*%  
  int y = (rect.Height() - cyIcon + 1) / 2; 'Kbrz  
  // Draw the icon wL="p) TO.  
  dc.DrawIcon(x, y, m_hIcon); t&J A1|q  
 } U$& '>%#  
 else vIOGDI>  
 { K.Y`/<  
  CDialog::OnPaint(); tkr&Fs"t+  
 } @*Ry`)T  
} :W1?t*z:[  
.'<K$:8@|  
HCURSOR CCaptureDlg::OnQueryDragIcon() }^&f {   
{ PgT8 1u  
 return (HCURSOR) m_hIcon; ?u@jedQ  
} =f{v:n6  
rz k;Q@1  
void CCaptureDlg::OnCancel() sg2%BkTI  
{ E1OrL.A6  
 if(bTray) mY4pvpZw8  
  DeleteIcon(); R )Arr77  
  CDialog::OnCancel(); It&CM,=t  
} TPk?MeVy%W  
Wtc ib-  
void CCaptureDlg::OnAbout() !W@mW 5J|  
{ x"NQatdq  
 CAboutDlg dlg; 86Q3d%;-yo  
 dlg.DoModal(); "IT7.!=@9  
} 72Y 6gcg  
NGl 8*Af   
void CCaptureDlg::OnBrowse() 3,{eH6,O7M  
{  ,S=[#  
 CString str; ; /K6U  
 BROWSEINFO bi; #YE?&5t  
 char name[MAX_PATH]; I@/ G#3Zr  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); A`f"<W-m  
 bi.hwndOwner=GetSafeHwnd(); 8TeOh 1\  
 bi.pszDisplayName=name; J*$%d1  
 bi.lpszTitle="Select folder"; $$1t4=Pz  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; "}*D,[C5e  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); wb?k  
 if(idl==NULL) ge GhM>G  
  return; [=q/f2_1.  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); =N\; ?eF(  
 str.ReleaseBuffer(); D4 8e30  
 m_Path=str; ?8"* B^*Sh  
 if(str.GetAt(str.GetLength()-1)!='\\') PD0&ep1h7G  
  m_Path+="\\"; bN zb#P#hP  
 UpdateData(FALSE); D~ Y6%9  
} n*wQgC'vw  
ra T9  
void CCaptureDlg::SaveBmp() m]>zdP+  
{ e! *] y&W  
 CDC dc; QTi@yT:  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 9Sxr9FLW~  
 CBitmap bm; cE 'LE1DK  
 int Width=GetSystemMetrics(SM_CXSCREEN); <Q9l'u]3$c  
 int Height=GetSystemMetrics(SM_CYSCREEN); _90D4kGU  
 bm.CreateCompatibleBitmap(&dc,Width,Height); kWZY+jyt P  
 CDC tdc; W{"sB:E  
 tdc.CreateCompatibleDC(&dc); ?I[8rzBWU  
 CBitmap*pOld=tdc.SelectObject(&bm); lTMY|{9  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); s"`~Xnf  
 tdc.SelectObject(pOld); m.m6.  
 BITMAP btm; :&vX0 Ce:  
 bm.GetBitmap(&btm); ?IHt T3'Rt  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; uv/\1N;V3  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); jj2iF/  
 BITMAPINFOHEADER bih; & mOn]  
 bih.biBitCount=btm.bmBitsPixel; rAu% bF  
 bih.biClrImportant=0; -!1=S: S  
 bih.biClrUsed=0; u NyN[U  
 bih.biCompression=0;  5cIZ_#  
 bih.biHeight=btm.bmHeight; EyA ny\"  
 bih.biPlanes=1; :kR>wX  
 bih.biSize=sizeof(BITMAPINFOHEADER); c#{lXS^  
 bih.biSizeImage=size; =6Ok4Z  
 bih.biWidth=btm.bmWidth; H}F UgA;  
 bih.biXPelsPerMeter=0; \+R%KA/F  
 bih.biYPelsPerMeter=0; :$b` n  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); $45|^.b  
 static int filecount=0; l'EO@D/M  
 CString name; ]i.N'O<p  
 name.Format("pict%04d.bmp",filecount++); BJux5Nh  
 name=m_Path+name; . f ja;aG  
 BITMAPFILEHEADER bfh; &S{r;N5u  
 bfh.bfReserved1=bfh.bfReserved2=0; ,XEIg  
 bfh.bfType=((WORD)('M'<< 8)|'B'); FprdP*/  
 bfh.bfSize=54+size; ]{6/6jl  
 bfh.bfOffBits=54; MrHJ)x"hy  
 CFile bf; Pl:4`oY3  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ M=Ze)X\E*'  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); DlUKhbo$g  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Q`9c/vPU  
  bf.WriteHuge(lpData,size); q8d](MaX  
  bf.Close(); Ow/,pC >V  
  nCount++; +fXwbZ?p  
 } f-|?He4O]  
 GlobalFreePtr(lpData); KBB)xez8  
 if(nCount==1) e^O:I  
  m_Number.Format("%d picture captured.",nCount); F;ttqL  
 else x*vD^1"'P  
  m_Number.Format("%d pictures captured.",nCount); ~ps,U  
  UpdateData(FALSE); !~vK[G(R  
} PG63{  
i;1pw_K  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) @FN|=?8%  
{ nKm# kb  
 if(pMsg -> message == WM_KEYDOWN) a*5KUj6/TL  
 { }9"'' Z  
  if(pMsg -> wParam == VK_ESCAPE) )&1v[]%S  
   return TRUE; $^iio@SW{  
  if(pMsg -> wParam == VK_RETURN) w UxFE=ia  
   return TRUE; q* R}yt5  
 } x8@ 4lxj  
 return CDialog::PreTranslateMessage(pMsg); + kKanm[!v  
} n\((#<&  
'z8FU~oU  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t,f ec>.  
{ uM`i!7}  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ jlj ge=#c2  
  SaveBmp(); 66pjWS {X  
  return FALSE; Pjs=n7  
} (SRY(q  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2V)+ ba|+  
 CMenu pop; VEh9N  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); lwf4ke  
 CMenu*pMenu=pop.GetSubMenu(0); ^_ch%3}Im  
 pMenu->SetDefaultItem(ID_EXITICON); GFdbwn5B  
 CPoint pt; -fPiHKJ  
 GetCursorPos(&pt); 3UUdJh<~  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); cOV9g)7^O  
 if(id==ID_EXITICON) M)oKtiav*  
  DeleteIcon(); 'd$RNqe  
 else if(id==ID_EXIT) ts,r,{  
  OnCancel(); */M`KPW  
 return FALSE; B%6cgm,  
} Kz42AC  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); z='%NZY  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0beP7}$  
 AddIcon(); b~vV++ou_  
 return res; Jo\MDyb]  
} Z|E9}Il]  
N5*Q nb8  
void CCaptureDlg::AddIcon() 4tCM 2it%  
{ Vr},+Rj  
 NOTIFYICONDATA data; I*N"_uKU  
 data.cbSize=sizeof(NOTIFYICONDATA); -NJpql{Cb  
 CString tip; t/;0/ql\  
 tip.LoadString(IDS_ICONTIP); |qMG@  
 data.hIcon=GetIcon(0); I #1~CbR  
 data.hWnd=GetSafeHwnd(); i1uoYb?4(I  
 strcpy(data.szTip,tip); ni2#20L  
 data.uCallbackMessage=IDM_SHELL; :+/8n+@#  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; n!z!fh  
 data.uID=98; J1}\H$*X  
 Shell_NotifyIcon(NIM_ADD,&data); 7zH2dqrj  
 ShowWindow(SW_HIDE); {d[Nc,AMb  
 bTray=TRUE; g}0K@z3  
} U&#` <R_0  
VP A+/5TW  
void CCaptureDlg::DeleteIcon() 9\.0v{&v  
{ eI:[o  
 NOTIFYICONDATA data; ? #rXc%F  
 data.cbSize=sizeof(NOTIFYICONDATA); oY^I|FEOz  
 data.hWnd=GetSafeHwnd(); Yc]V+NxxQ  
 data.uID=98; $L= Dky7  
 Shell_NotifyIcon(NIM_DELETE,&data); `*vO8v  
 ShowWindow(SW_SHOW); l48$8Mgrr  
 SetForegroundWindow(); 'UsR/h5T  
 ShowWindow(SW_SHOWNORMAL); `TJhH<z"%  
 bTray=FALSE; OY{fxBb  
} /.0K#J:  
mzK0$y #*o  
void CCaptureDlg::OnChange() D-/6RVq0m  
{ ;F258/J  
 RegisterHotkey(); "BSY1?k{  
} #<)[{+f[t  
ht2Fi e  
BOOL CCaptureDlg::RegisterHotkey() Cw(e7K7&  
{ 72Bc0Wg  
 UpdateData(); ^!S4?<v  
 UCHAR mask=0; ,pD sU@  
 UCHAR key=0; `'s_5Ek  
 if(m_bControl) !tTv$L>  
  mask|=4;  ~frsgHW  
 if(m_bAlt) 68z#9}  
  mask|=2; Sqn>L`Lz  
 if(m_bShift) ?IAu,s*u  
  mask|=1; nKGQU,C  
  key=Key_Table[m_Key.GetCurSel()]; @ 3=pFYW)  
 if(bRegistered){ F[}#7}xjA  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); `$ f`55e  
  bRegistered=FALSE; "]=OR>  
 } uNn1qV  
 cMask=mask; :o^ioX.J  
 cKey=key; nCi ]6;Y  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); W5Z-s.o  
 return bRegistered; :<P4=P P  
} GPHb-  
+ -Rf@  
  四、小结 i[KXkjr  
Fl.?*KBz  
  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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