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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: [T,Df&  
  9N|JI3*41  
  一、实现方法 TBHd)BhI.  
s,D GFK  
  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: H/*i-%]v+(  
")fgQ3XZ  
#pragma data_seg("shareddata") K5(T7S  
HHOOK hHook =NULL; //钩子句柄 vJW`aN1<I3  
UINT nHookCount =0; //挂接的程序数目 7mb5z/N  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4&6cDig7*2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 P)ne^_   
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey -'i[/{  
static int KeyCount =0; 6S(`Bw8h  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 5Iv"  
#pragma data_seg() ]0{,P !  
GW9,%}l^;  
  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。 'n?"f|G  
w}29#F\]R  
  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: HS1{4/  
kC'm |Y@T  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR jank<Q&w  
cKey,UCHAR cMask) j\.e6&5%SS  
{ ^Je*k)COn  
 BOOL bAdded=FALSE; :rvBx"  
 for(int index=0;index<MAX_KEY;index++){ -{yG+1  
  if(hCallWnd[index]==0){ T{BGg  
   hCallWnd[index]=hWnd; A\ tBmL_s  
   HotKey[index]=cKey; ZV07;`I  
   HotKeyMask[index]=cMask; y cWY.HD  
   bAdded=TRUE; u#->?  
   KeyCount++; 0bGQO&s [  
   break; C{6m?6  
  } 2J` LZS  
 } 2[KHmdgtB  
 return bAdded; sr:hR Q27  
} \ow(4O#  
//删除热键 >waA\C}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _G)x\K]N  
{ ?1X7jn`,+  
 BOOL bRemoved=FALSE; Wx8;+!2Q/  
 for(int index=0;index<MAX_KEY;index++){ BJsN~` =r  
  if(hCallWnd[index]==hWnd){ Q|g>ga-a  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){  7re4mrC  
    hCallWnd[index]=NULL; X0KUnxw  
    HotKey[index]=0; d~b @F&mf  
    HotKeyMask[index]=0; GVdJ&d\x  
    bRemoved=TRUE; /EvT%h?p  
    KeyCount--; XK(aH~7xme  
    break; nYK!'x$  
   } ==bT0-M.~  
  } @_h=,g #@  
 } U.|0y=  
 return bRemoved; t 9_&n.z  
} CY)[{r  
EhN@;D+  
Ba n^wX  
  DLL中的钩子函数如下: =1mIk0H`  
]oC7{OoX  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) HA0yX?f]  
{ hllb\Y)XL  
 BOOL bProcessed=FALSE; D,s[{RW+q  
 if(HC_ACTION==nCode) B{1yMJA  
 { 1rh2!4)7  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 2{L[D9c/6  
   switch(wParam) QmsS,Zljo  
   {  jgw+c3^R_  
    case VK_MENU: k6_OP]  
     MaskBits&=~ALTBIT; QO|jdlg  
     break; ^ =H 10A  
    case VK_CONTROL: a#3,qp!  
     MaskBits&=~CTRLBIT; "l6Ob  
     break; CO SQ  
    case VK_SHIFT: Z0Qh7xWve  
     MaskBits&=~SHIFTBIT; "K*^%{  
     break; c*)PS`]t  
    default: //judge the key and send message &Fch{%S>  
     break; 4WQ 96|F  
   } YMn=9EUp  
   for(int index=0;index<MAX_KEY;index++){ ]T>YYz  
    if(hCallWnd[index]==NULL) .O9Pn,:  
     continue; & )EL%o5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a+n?y)u  
    { [g: KFbEY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); kgRgHkAH~  
     bProcessed=TRUE; B5va4@  
    } cLMFC1=b  
   } t%Y}JKLR  
  } .~4DlT  
  else if((lParam&0xc000ffff)==1){ //有键按下 4rNuAK`2  
   switch(wParam) [xPO'@Y  
   { mzTM&@  
    case VK_MENU: @ds.)sKA>  
     MaskBits|=ALTBIT; :?7^STc  
     break; 6^nxw>-   
    case VK_CONTROL: 4n.EA,:g:(  
     MaskBits|=CTRLBIT; Qexv_:C  
     break; cA+O]",}  
    case VK_SHIFT: QWK\6  
     MaskBits|=SHIFTBIT; $60]RCu  
     break; L$f:D2Ei  
    default: //judge the key and send message rE.z.r"O  
     break; cX48?srG  
   } Z`@< O%  
   for(int index=0;index<MAX_KEY;index++){ Pv3 e*I((  
    if(hCallWnd[index]==NULL) _ud !:q  
     continue; kL%o9=R1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g U v`G  
    { *lp{,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Uj~ :| ?Wz  
     bProcessed=TRUE; 1?T^jcny:M  
    } 6X GqZ!2  
   } h)yAg e  
  } j}$Q`7-wB1  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 &0euNHH;sL  
   for(int index=0;index<MAX_KEY;index++){ i>@"&  
    if(hCallWnd[index]==NULL) @!Q\| <  
     continue; ZN(@M@}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $:0?"?o);  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); gz"I=9  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 JA^Y:@<{/  
   } 4B@L<Rl{\  
  } },tn  
 } [Ma d~;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3 e<sNU?  
} Vu1X@@z  
{@<EVw  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: jX{t/8v/s4  
 .tRWL!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JUC62s#_z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;=?KQq f  
Kyq/o-  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: n4Eqm33  
z8n]6FDiE  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =Ev* Q[  
{ q|wwfPez7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) R9V v*F]m@  
 { 5y|/}D>  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 a`uHkRX )U  
  SaveBmp(); {t<U:*n2  
  return FALSE; `$N AK  
 } L\H,cimN  
 …… //其它处理及默认处理 [|\BuUT'  
} <Q? X'.  
M\ {W&o1!  
*ZA.O  
  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-1y2AQ  
A{b?ZT~2]  
  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。 Dz>v;%$S-  
[1gWc`#  
  二、编程步骤 S,TK;g  
^ G(GjW8  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; O U3KB  
m\xE8D(,  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; <xQHb^:  
fo30f =^Gi  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; `l8^n0-  
Upkw.`D`  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 6@@J>S>  
H{3A6fb<  
  5、 添加代码,编译运行程序。 :If1zB)  
 7ehs+GI  
三、程序代码 F82_#|kpS  
Jd>"g9  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL /`V:;  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 6Q.6  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Ad:)5R o  
#if _MSC_VER > 1000 @SV.F  
#pragma once i0-zGEMB.  
#endif // _MSC_VER > 1000 X}$uvB}+>  
#ifndef __AFXWIN_H__ [#emm1k  
#error include 'stdafx.h' before including this file for PCH _PeBV<  
#endif NbtNu$%t  
#include "resource.h" // main symbols {qHf%y&[  
class CHookApp : public CWinApp U`fxe`nVa  
{ ]Kb3'je  
 public: A!Ls<D.  
  CHookApp(); ~L.)<{?  
  // Overrides 'rw nAr  
  // ClassWizard generated virtual function overrides sOBy)vq?\  
  //{{AFX_VIRTUAL(CHookApp) m# ]VdO'f  
 public: *?Sp9PixP  
  virtual BOOL InitInstance(); OK}+:Y  
  virtual int ExitInstance(); y84= Q  
  //}}AFX_VIRTUAL )q48cQ  
  //{{AFX_MSG(CHookApp) ?lYi![.o  
  // NOTE - the ClassWizard will add and remove member functions here. b{o%`B*  
  // DO NOT EDIT what you see in these blocks of generated code ! ]"< ` ^  
  //}}AFX_MSG \Q+<G-Kb.  
  DECLARE_MESSAGE_MAP() Gmi$Nl!~  
}; oX9rpTi  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); wv8WqYV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); KC-q]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P+Ta|-  
BOOL InitHotkey(); D d$ SQ  
BOOL UnInit(); cDS6RO?  
#endif W/m,qilQI  
v~N8H+! d  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ):lq}6J#  
#include "stdafx.h" MDCK@?\  
#include "hook.h" l`s_ #3  
#include <windowsx.h> k]=Yi;  
#ifdef _DEBUG d?)C} 2  
#define new DEBUG_NEW SqhG\qE{Qj  
#undef THIS_FILE `4'['x  
static char THIS_FILE[] = __FILE__; [D=3:B&f  
#endif )o<rU[oD]C  
#define MAX_KEY 100 n3t0Qc  
#define CTRLBIT 0x04 csV.AN'obq  
#define ALTBIT 0x02 ?>V4pgGCE  
#define SHIFTBIT 0x01 /pvR-Id|6  
#pragma data_seg("shareddata") bF'^eR  
HHOOK hHook =NULL; C"I:^&sL  
UINT nHookCount =0; 09{B6l6P  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey g pN{1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 4{d!}R  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey p<\yp<g  
static int KeyCount =0; `4& GumG  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift OE(Z)|LF  
#pragma data_seg() D<zgs2Ex  
HINSTANCE hins; _[8BAm  
void VerifyWindow(); 4  |E`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) !'()QtvC<  
//{{AFX_MSG_MAP(CHookApp) P%v7(bqL4+  
// NOTE - the ClassWizard will add and remove mapping macros here. OYEL`!Q  
// DO NOT EDIT what you see in these blocks of generated code! VQ/<MY C  
//}}AFX_MSG_MAP BK>uJv-qU  
END_MESSAGE_MAP() .r/6BDE"  
zice0({iJ  
CHookApp::CHookApp() Azun"F_f  
{ C~.7m-YW  
 // TODO: add construction code here, AKVll  
 // Place all significant initialization in InitInstance gu[3L  
} h^h!OQKQ  
DbdxHuKa>  
CHookApp theApp; !YlyUHD  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) jj,Y:  
{ E}aTH  
 BOOL bProcessed=FALSE; LY%`O#i.  
 if(HC_ACTION==nCode) y5L%_ {n  
 { <6=kwV6  
  if((lParam&0xc0000000)==0xc0000000){// Key up Z?H#=|U  
   switch(wParam) ,ufB*[~  
   { F)mlCGv:R  
    case VK_MENU: X0Q};,  
     MaskBits&=~ALTBIT; _ 13M  
     break; URbu=U  
    case VK_CONTROL: DS,"^K  
     MaskBits&=~CTRLBIT; }5Yd:%u5  
     break; jFBLElE  
    case VK_SHIFT: 'OKDB7Ni  
     MaskBits&=~SHIFTBIT; 5gV%jQgkC  
     break; |0vV?f$  
    default: //judge the key and send message UwuDs2 t  
     break; _VFxzM9f  
   } -z]v"gF?Px  
   for(int index=0;index<MAX_KEY;index++){ o7N3:)  
    if(hCallWnd[index]==NULL) J;pn5k~3  
     continue; K4Mv\!Q<8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d7+YCi?  
    {  }xcEWC\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Fh u(u  
     bProcessed=TRUE; t =ErJ  
    } LEoL6ga  
   } N`7) 88>w  
  } FpjpsD~ Qu  
  else if((lParam&0xc000ffff)==1){ //Key down **L. !/  
   switch(wParam) K~p\B  
   { ENwDW#U9  
    case VK_MENU: ln#Jb&u  
     MaskBits|=ALTBIT; KXEDpr  
     break; ~U+SK4SK:o  
    case VK_CONTROL: rmj?jBKQU  
     MaskBits|=CTRLBIT; d Ybb>rlu  
     break; ^lCys  
    case VK_SHIFT: ?Xscc mN  
     MaskBits|=SHIFTBIT; #!d@;= [\  
     break; )J&1uMp{  
    default: //judge the key and send message pCOr{I\  
     break; =k#SQ/@  
   } L 0?-W%$>  
   for(int index=0;index<MAX_KEY;index++) L Of0_g/  
   { f S50  
    if(hCallWnd[index]==NULL) KUG\C\z6=  
     continue;  l`x;Og>a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nmlQ-V-  
    { : [o0Va2 d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); k23*F0Dv  
     bProcessed=TRUE; Vk/CV2  
    } mAkR<\?iTF  
   } .!T]sX_P  
  } R9X* R3nB  
  if(!bProcessed){ ,&S:(b[D  
   for(int index=0;index<MAX_KEY;index++){ &D, gKT~  
    if(hCallWnd[index]==NULL) (,~gY=E+  
     continue; &DC o;Ij;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Wb:jZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); T&6W>VQ|[>  
   } (J(JB}[X,  
  } uc@f#(-  
 } (;2J}XQvO~  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); RX.n7Tb  
} Xk[;MZ[  
1<RB}M  
BOOL InitHotkey() n5i#GvO^  
{ MsMNP[-l  
 if(hHook!=NULL){ ^v. ~FFK  
  nHookCount++; X(F 2 5  
  return TRUE; W]p)}#FR  
 } 0\f3La  
 else r'7>J:cy=  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); #Jt9U1WbF  
  if(hHook!=NULL) @RW=(&<1  
   nHookCount++; e*w2u<HP  
  return (hHook!=NULL); au'Zjj/Ai5  
} ?9#}p  
BOOL UnInit() 6; g_}Zx  
{ NLHF3h=?1p  
 if(nHookCount>1){ !\.%^LK1  
  nHookCount--; [!E pv<G  
  return TRUE; k 9 Xi|Yj  
 } ml$"C  
 BOOL unhooked = UnhookWindowsHookEx(hHook); mF\r]ovVm  
 if(unhooked==TRUE){ {S4^;Va1  
  nHookCount=0; Iuk!A?XV  
  hHook=NULL; '&{`^l/ MH  
 } <`8l8cL  
 return unhooked; /7Z;/|oU  
} )0Av:eF-+  
2Uf]qQ1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,TY&N-  
{ B.nq3;Y  
 BOOL bAdded=FALSE; [ UN`~  
 for(int index=0;index<MAX_KEY;index++){ AZ~= ]1  
  if(hCallWnd[index]==0){ ]Z?$ 5Ks  
   hCallWnd[index]=hWnd; ~3bn?'`  
   HotKey[index]=cKey; Jsf -t  
   HotKeyMask[index]=cMask; L1;IXCc=  
   bAdded=TRUE; uY+N163i  
   KeyCount++; Q%6Lc.i  
   break; l!z0lh- J  
  } Y Gb&mD  
 } iT#)i3   
 return bAdded; C"w>U   
} "NqB_?DT  
{J-kcD!bz`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p-QD(+@M  
{ Dg]( ?^  
 BOOL bRemoved=FALSE; %j9'HtjEa  
 for(int index=0;index<MAX_KEY;index++){ r9@4-U7v&  
  if(hCallWnd[index]==hWnd){ xB=~3  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~$7fU  
    hCallWnd[index]=NULL; <{U "0jY!9  
    HotKey[index]=0; HS!O;7s'  
    HotKeyMask[index]=0; -' 7I|r  
    bRemoved=TRUE; :G?6Hl)~)  
    KeyCount--; lqPzDdC^>  
    break; gKK*` L~  
   } )sg@HFhY'  
  } NbyVBl0=  
 } cY1d6P0  
 return bRemoved; *3_@#Uu7  
} Z6G>j  
"_Wv,CYmNr  
void VerifyWindow()  =lIG#{`Q  
{ r@;n \  
 for(int i=0;i<MAX_KEY;i++){ C^vB&3ghi  
  if(hCallWnd!=NULL){ fba QXM  
   if(!IsWindow(hCallWnd)){ v{7Jzjd  
    hCallWnd=NULL; 6BT o%  
    HotKey=0; ;Js-27_0  
    HotKeyMask=0; fg1_D  
    KeyCount--; rap`[O|l=  
   } >gNVL (  
  } `4V_I%lJ&  
 } $ K>.|\  
} y#-mj,e  
OmO/x  
BOOL CHookApp::InitInstance() 9Yg=4>#$  
{ 3=( Gb  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); (gd+-o4  
 hins=AfxGetInstanceHandle(); hVPSW# .d  
 InitHotkey(); uH'n.d"WG  
 return CWinApp::InitInstance(); 6J3:[7k=&  
} ^^MVd@,i  
Lw EI   
int CHookApp::ExitInstance() + D ,Nd=/  
{ Y0`=h"g  
 VerifyWindow(); \%fl`+`  
 UnInit(); gc|?$aE  
 return CWinApp::ExitInstance(); 4Eq$f (QJ  
} |fYr*8rH  
u;$g1 3  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $6~ J#;  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Y_qRW. k  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Kfho:e,  
#if _MSC_VER > 1000 Dk$[b9b  
#pragma once :_R[@?c  
#endif // _MSC_VER > 1000 8 /3`rEW  
Qo7]fnnaV  
class CCaptureDlg : public CDialog 1+\ZLy!5:  
{ )@"iWQ 3K  
 // Construction . e' vc  
 public: {<XPE:1>Y  
  BOOL bTray; HFV4S]U=  
  BOOL bRegistered; UOTM>d1P  
  BOOL RegisterHotkey(); d^5OB8t  
  UCHAR cKey; kaBP& 6|Z  
  UCHAR cMask; "o+E9'Dm  
  void DeleteIcon(); I"/p^@IX  
  void AddIcon(); Er; @nOyD  
  UINT nCount; h*J=F0KM  
  void SaveBmp(); hq}kAv4B=  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor >0yx!Iao  
  // Dialog Data YcJZG|[  
  //{{AFX_DATA(CCaptureDlg) |TCHPKN  
  enum { IDD = IDD_CAPTURE_DIALOG }; 6|q\ M  
  CComboBox m_Key; \nQV{J  
  BOOL m_bControl; l(;~9u0sa  
  BOOL m_bAlt; q'u^v PO  
  BOOL m_bShift; o&tETJ5Bhe  
  CString m_Path; 0OJBC~?{\  
  CString m_Number; *`]LbS  
  //}}AFX_DATA EjZ_|Q  
  // ClassWizard generated virtual function overrides bDh,r!I  
  //{{AFX_VIRTUAL(CCaptureDlg) :q6j{C(  
 public: kjW Y{7b!  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ~&bn} M>W  
 protected: FbxrBM  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support G&i<&.i  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); B&J;yla6`d  
  //}}AFX_VIRTUAL :G+8%pUX]  
  // Implementation fJ \bm  
 protected: $]eU'!2)  
  HICON m_hIcon; ^HpUbZpat)  
  // Generated message map functions xO2e>[W  
  //{{AFX_MSG(CCaptureDlg) :by EXe;3  
  virtual BOOL OnInitDialog(); #=~n>qn]  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,Jqi J?,4C  
  afx_msg void OnPaint(); n)]]g3y2  
  afx_msg HCURSOR OnQueryDragIcon(); <PCa37  
  virtual void OnCancel(); #SNwSx&  
  afx_msg void OnAbout(); oqu; D'8  
  afx_msg void OnBrowse(); )n8(U%q$  
  afx_msg void OnChange(); >fCz,.L  
 //}}AFX_MSG kNW}0CDgs  
 DECLARE_MESSAGE_MAP() U Ke!zI  
}; v;=F $3  
#endif 6y;R1z b  
bUR; d78  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $LxfdSa  
#include "stdafx.h" ;MD6iBD  
#include "Capture.h" GEJEhwO;H  
#include "CaptureDlg.h" eBw6k09C+  
#include <windowsx.h> 9 gt$z}oU  
#pragma comment(lib,"hook.lib") ][Ne;F6  
#ifdef _DEBUG lFHj]%Y  
#define new DEBUG_NEW {rp5qgVE<  
#undef THIS_FILE :el]IH  
static char THIS_FILE[] = __FILE__; %bs6Uy5g)a  
#endif g=8}G$su{%  
#define IDM_SHELL WM_USER+1 Yv="oG!xL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); '`.bmiM  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BT?)-wS  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; dEz7 @T  
class CAboutDlg : public CDialog ,yZvT7  
{ xx^7  
 public: ZM:!LkK  
  CAboutDlg(); 37:\X5)z/  
  // Dialog Data "?_r?~sJx  
  //{{AFX_DATA(CAboutDlg) !'E{D`A9  
  enum { IDD = IDD_ABOUTBOX }; 0taopDi ;d  
  //}}AFX_DATA aTJs.y -I~  
  // ClassWizard generated virtual function overrides ?V3kIb  
  //{{AFX_VIRTUAL(CAboutDlg) } v#Tm  
 protected: K,pQ11J  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Tnw0S8M  
  //}}AFX_VIRTUAL Xi^#F;@sU  
  // Implementation v.wHj@  
 protected: MiB"CcU  
  //{{AFX_MSG(CAboutDlg) IF"-{@  
  //}}AFX_MSG (]*otVJ  
  DECLARE_MESSAGE_MAP() ?`jh5Kw%y  
}; :i;iSrKy  
_FG?zE  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) FH"u9ygF  
{ t)O8ON  
 //{{AFX_DATA_INIT(CAboutDlg) 5 iz(R:P<  
 //}}AFX_DATA_INIT 5.1 c#rL  
} {+n0t1  
l!6^xMhYk  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Vn4y^_H  
{ =!@5!  
 CDialog::DoDataExchange(pDX); gO{XD.s  
 //{{AFX_DATA_MAP(CAboutDlg) KJ/ *BBf  
 //}}AFX_DATA_MAP mW_B|dM"  
} .?C-J  
X- xN<S q  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) JYE[ 1M  
 //{{AFX_MSG_MAP(CAboutDlg) o;d><  
 // No message handlers @Yv+L)  
 //}}AFX_MSG_MAP O!Rw? Y  
END_MESSAGE_MAP() (5-4`:1ux  
5Z2tTw'i  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) O@$wU9 D<  
: CDialog(CCaptureDlg::IDD, pParent) ]!v:xjzT  
{ @vy {Q7aM  
 //{{AFX_DATA_INIT(CCaptureDlg) z?9vbx  
  m_bControl = FALSE;  BKiyog  
  m_bAlt = FALSE; F_Pv\?35z  
  m_bShift = FALSE; H<hFA(M  
  m_Path = _T("c:\\"); U{^~X_?  
  m_Number = _T("0 picture captured."); Iuh1tcc  
  nCount=0; _trF/U<  
  bRegistered=FALSE; X>0$zE@0  
  bTray=FALSE; 2swHJ.d\  
 //}}AFX_DATA_INIT 4P1<Zi+<  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 epWTZV(1x  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); H)eecH$K  
} p2(U'x c  
!!jitFHzb  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) m2j&v$  
{ SHc<`M'+  
 CDialog::DoDataExchange(pDX); #osP"~{  
 //{{AFX_DATA_MAP(CCaptureDlg) z2EZ0vZ  
  DDX_Control(pDX, IDC_KEY, m_Key); -d|Q|zF^x  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); L)0j&  
  DDX_Check(pDX, IDC_ALT, m_bAlt); b.Yl0Y  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 1WArgR  
  DDX_Text(pDX, IDC_PATH, m_Path); H%}ro.u  
  DDX_Text(pDX, IDC_NUMBER, m_Number); e:&+m`OSH  
 //}}AFX_DATA_MAP ~M>EB6  
} =\t%U5  
m1](f[$  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) st|;] q9?  
//{{AFX_MSG_MAP(CCaptureDlg) L<GF1I)  
 ON_WM_SYSCOMMAND() ~E]ct F  
 ON_WM_PAINT() N+l 0XjZD9  
 ON_WM_QUERYDRAGICON() # p?7{"Ep  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) qUZm6)p6[a  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) fR:BF47  
 ON_BN_CLICKED(ID_CHANGE, OnChange) _ct18nh9  
//}}AFX_MSG_MAP oNk ASAd  
END_MESSAGE_MAP() V>8)1)dF  
zc}qAy'<  
BOOL CCaptureDlg::OnInitDialog() t[L_n m5-  
{ __F?iRrCM  
 CDialog::OnInitDialog(); eU[f6OGqC  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); f{} zqCK  
 ASSERT(IDM_ABOUTBOX < 0xF000); @L p;p$G`  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ?0ezr[`.  
 if (pSysMenu != NULL) /b$0).fj@,  
 { V*$(Tt(  
  CString strAboutMenu; v#HaZT]u  
  strAboutMenu.LoadString(IDS_ABOUTBOX); hkK+BmMj\  
  if (!strAboutMenu.IsEmpty()) 7wO0d/l_  
  { S:\a&+og  
   pSysMenu->AppendMenu(MF_SEPARATOR); k|O?qE1hP  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); pl-2O $  
  } U c6]]Bbc  
 } 5tSR2gG#K,  
 SetIcon(m_hIcon, TRUE); // Set big icon 7tEK&+H`  
 SetIcon(m_hIcon, FALSE); // Set small icon y<53xZi  
 m_Key.SetCurSel(0); 3!+N} [$iy  
 RegisterHotkey(); QN GICG-  
 CMenu* pMenu=GetSystemMenu(FALSE); 5W T^;J9V  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); YY&3M  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 3@d{C^\  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); !I 7bxDzK$  
 return TRUE; // return TRUE unless you set the focus to a control ,wI$O8"!j  
} w6B'&  
i?*_-NAm  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [(hB%x_"  
{ Oq7R^t`b  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) oj8_e xx  
 { Ca&p;K9FR  
  CAboutDlg dlgAbout; #P)7b,3pe  
  dlgAbout.DoModal(); gwf *M3(  
 } v7V.,^6+  
 else |Lq -vs?  
 { /~4wM#Yi8  
  CDialog::OnSysCommand(nID, lParam); m]Sv>|  
 } i8]2y  
} wR x5` @  
3?}W0dZ$d  
void CCaptureDlg::OnPaint() X5(S+;v"^  
{ .U66Uet>RX  
 if (IsIconic()) `I\)Kk@*b9  
 { ZL0':7  
  CPaintDC dc(this); // device context for painting IT.'`!T  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); E(0(q#n  
  // Center icon in client rectangle OG M9e!  
  int cxIcon = GetSystemMetrics(SM_CXICON); kpe7\nd=>  
  int cyIcon = GetSystemMetrics(SM_CYICON); m((A  
  CRect rect; D<.zdTo  
  GetClientRect(&rect); ! uC`7a  
  int x = (rect.Width() - cxIcon + 1) / 2; }G:5P3f  
  int y = (rect.Height() - cyIcon + 1) / 2; +cDz`)N,,  
  // Draw the icon [i8,rOa7  
  dc.DrawIcon(x, y, m_hIcon); FUq>+U!Qu  
 } uV\ _j3,2  
 else d1MVhE  
 { *jBn ^  
  CDialog::OnPaint(); g_2m["6*  
 } AADvk_R  
} :4{;^|RgU  
WWO@ULGY  
HCURSOR CCaptureDlg::OnQueryDragIcon() !A.Kb74  
{ 97$1na3gq  
 return (HCURSOR) m_hIcon; -:5]*zVp+-  
} S`!MoIMsD  
W?(^|<W  
void CCaptureDlg::OnCancel() Fu K(SP3  
{  qep<7 QO  
 if(bTray) l c<&f  
  DeleteIcon(); A[,[j?wC  
  CDialog::OnCancel(); m&'z|eN  
} xk1pZQ8c  
E !a5-SrR  
void CCaptureDlg::OnAbout() t`"]"Re  
{ v{R:F  
 CAboutDlg dlg; /K#t$O4  
 dlg.DoModal(); rA*"22v=  
} oNgu- &  
gFsnL*L0  
void CCaptureDlg::OnBrowse() 8gA:s`ofJ  
{ ng ZkBX  
 CString str; }ph;~og}y  
 BROWSEINFO bi; lS`hJ:  
 char name[MAX_PATH]; :QSCky*i  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); \XG18V&  
 bi.hwndOwner=GetSafeHwnd(); E&?z-,-o@  
 bi.pszDisplayName=name; ozs xqN  
 bi.lpszTitle="Select folder"; kUl:Yj=&  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; (I?CW~3#  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); b,?@_*qv+  
 if(idl==NULL) zLG5m]G4D  
  return; Q~5!c#r  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Cq7EdK;x  
 str.ReleaseBuffer(); JsOu *9R  
 m_Path=str; Eua\N<!aai  
 if(str.GetAt(str.GetLength()-1)!='\\') 94=aVM\>>  
  m_Path+="\\"; zuWfR&U|W  
 UpdateData(FALSE); D@Zb|EI%<  
} I|6wPV?  
}y-b<J ?H  
void CCaptureDlg::SaveBmp() KUC (n!  
{ I b)>M`J  
 CDC dc; Ha~g8R&  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Ax#$z  
 CBitmap bm; x)X=sX.  
 int Width=GetSystemMetrics(SM_CXSCREEN);  oQrkd:  
 int Height=GetSystemMetrics(SM_CYSCREEN); T~nmEap  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ZaCUc Px  
 CDC tdc; *):xK;o  
 tdc.CreateCompatibleDC(&dc); cuJ%;q=;  
 CBitmap*pOld=tdc.SelectObject(&bm); 2?]NQE9lA  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4= VAJ  
 tdc.SelectObject(pOld); !l7eB@O  
 BITMAP btm; _084GK9{W  
 bm.GetBitmap(&btm); [Z3B~c  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; YN\!I  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); rb+&]  
 BITMAPINFOHEADER bih; 2:(h17So  
 bih.biBitCount=btm.bmBitsPixel; ^&o38=70*  
 bih.biClrImportant=0; =] R_6#  
 bih.biClrUsed=0; =[O;/~J%:  
 bih.biCompression=0; axTvA(k9  
 bih.biHeight=btm.bmHeight; @:'swO/\<  
 bih.biPlanes=1; w[>/(R7im  
 bih.biSize=sizeof(BITMAPINFOHEADER); u S$:J:Drx  
 bih.biSizeImage=size; /f!CX|U  
 bih.biWidth=btm.bmWidth; `+~@VZ3m  
 bih.biXPelsPerMeter=0; \ 9T;-]  
 bih.biYPelsPerMeter=0; OzFA>FK0f;  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); WJG&`PP  
 static int filecount=0; L< MIl[z7  
 CString name; EJ*  
 name.Format("pict%04d.bmp",filecount++); x,Im%!h  
 name=m_Path+name; M(,npW  
 BITMAPFILEHEADER bfh; #ii,GN~N  
 bfh.bfReserved1=bfh.bfReserved2=0; JW!SrM xF  
 bfh.bfType=((WORD)('M'<< 8)|'B'); t]Ey~-Rx  
 bfh.bfSize=54+size; p]d3F^*i  
 bfh.bfOffBits=54; R3]Ra&h6N)  
 CFile bf; m6P!#=a:l<  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ &n% 3rC5{  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); kan?2x  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !]tZE%?  
  bf.WriteHuge(lpData,size); 8oI)q4V  
  bf.Close(); 'F'v/G~F  
  nCount++; 6?U2Et  
 } Nl_Sgyx,\  
 GlobalFreePtr(lpData); tqY)  
 if(nCount==1) O!!Ne'I  
  m_Number.Format("%d picture captured.",nCount); h9)QQPP  
 else h"S+8Y:1{k  
  m_Number.Format("%d pictures captured.",nCount); pZR KM<k  
  UpdateData(FALSE); v)(tB7&`=  
} ]KMOLe6(  
<~BheGmmy  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) C LhD[/Fo  
{ /? n 9c;w  
 if(pMsg -> message == WM_KEYDOWN) &xF 2!t`  
 { jI$}\*g  
  if(pMsg -> wParam == VK_ESCAPE) A*I mruV  
   return TRUE; M2ig iR  
  if(pMsg -> wParam == VK_RETURN) n/_cJD \  
   return TRUE; pU`4bT(w%  
 } *yGOm i  
 return CDialog::PreTranslateMessage(pMsg); P7n+@ L$  
} ?@ ei_<A{  
pQaP9Y{OK  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) XDvT#(Pu  
{ <tZPS`c'_  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ZFy>Z:&S,  
  SaveBmp(); jP6;~[rl  
  return FALSE; /i+8b(x  
} 8H_3.MK  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ sa8Sy&X"  
 CMenu pop; ~y{(&7sM  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); U$KdY _Z97  
 CMenu*pMenu=pop.GetSubMenu(0); vVF#]t b|  
 pMenu->SetDefaultItem(ID_EXITICON); rvRtR/*?j  
 CPoint pt; 6N >ksqo8%  
 GetCursorPos(&pt); h3.wR]ut  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {9KG06%+  
 if(id==ID_EXITICON) F"9f6<ge  
  DeleteIcon(); {\G4YQ  
 else if(id==ID_EXIT) zO`54^  
  OnCancel(); 4NxtU/5-sU  
 return FALSE; vs|>U-Mpw~  
} ?6@Y"5 z3g  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); vB, X)  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8cy#[{u`;  
 AddIcon(); 'sI=*c  
 return res; xz YvD{>  
} :0pxacD"!  
^ MkT">  
void CCaptureDlg::AddIcon() }2M2R}D  
{ "(ehf|%>%  
 NOTIFYICONDATA data; {{ M?+]p,^  
 data.cbSize=sizeof(NOTIFYICONDATA); A(#hyb#  
 CString tip; .H+`]qLkL  
 tip.LoadString(IDS_ICONTIP); 6/9 A'!4C  
 data.hIcon=GetIcon(0); aX6.XHWbDf  
 data.hWnd=GetSafeHwnd(); 4f~hd-z  
 strcpy(data.szTip,tip); Zk2-U"0\o  
 data.uCallbackMessage=IDM_SHELL; VF=$'Bl|  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; dI&2dcumS  
 data.uID=98; >4=sEj  
 Shell_NotifyIcon(NIM_ADD,&data); < 2w@5qL  
 ShowWindow(SW_HIDE); BvpGP  
 bTray=TRUE; xmZ]mu,,$  
} Gk2\B]{  
UT$G?D";M  
void CCaptureDlg::DeleteIcon() T$13"?sr=  
{ 0o[p<<c*  
 NOTIFYICONDATA data; 68R[Lc9q5  
 data.cbSize=sizeof(NOTIFYICONDATA); >:5/V0;,  
 data.hWnd=GetSafeHwnd(); @jg*L2L6  
 data.uID=98; <R}(UK  
 Shell_NotifyIcon(NIM_DELETE,&data); |_HH[s*U  
 ShowWindow(SW_SHOW); XbYW,a@w2  
 SetForegroundWindow(); j&) +qTV  
 ShowWindow(SW_SHOWNORMAL); OUn,URI  
 bTray=FALSE; UO8#8  
} <LQwH23@  
dNG>:p  
void CCaptureDlg::OnChange() MsCY5g  
{ @rkNx@[~  
 RegisterHotkey(); ;id0|x  
} -uenCWF\#  
w<N [K>  
BOOL CCaptureDlg::RegisterHotkey() Ix ! O&_6s  
{ PMjqcdBzm  
 UpdateData(); OOs Y{8xM  
 UCHAR mask=0; !HM{imT  
 UCHAR key=0; \MQ|(  
 if(m_bControl) rC}r99Pe:x  
  mask|=4; B|gyr4]  
 if(m_bAlt) )P@t,mxW/  
  mask|=2; #A@*k}/+  
 if(m_bShift) [GZ%K`wx  
  mask|=1; 5E?{>1  
  key=Key_Table[m_Key.GetCurSel()]; GUE 3|  
 if(bRegistered){ G/\t<>O8o  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); a_w# ,^/P  
  bRegistered=FALSE; bcC ;i~9  
 } K+TRt"W8&s  
 cMask=mask; mu04TPj  
 cKey=key; [2~Et+r6g  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); *xA&t)z(i  
 return bRegistered; R @b[o7/  
} WE 'afxgV  
^aN;M\  
  四、小结 ?SRG;G1  
o X )r4H?  
  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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