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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: ?CZD^>6  
  NITx;iC  
  一、实现方法 A;`U{7IST  
JG4*B|3  
  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: 8+cpNX  
` +UMZc  
#pragma data_seg("shareddata") y-q?pqt  
HHOOK hHook =NULL; //钩子句柄 o9d$ 4s@/  
UINT nHookCount =0; //挂接的程序数目 ;Hp'x_xQ  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 *vE C,)  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 TY[d%rMm  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 0HuRFl  
static int KeyCount =0; n:."ZBtY*  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 $ 14DTjj  
#pragma data_seg() Y"rV[oe   
!;!~5"0~"  
  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。 +5|nCp6||j  
YaT+BRh?  
  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: ko>O ~@r  
mKn357:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR F1*rUsRKN  
cKey,UCHAR cMask) "g1;TT:1~  
{ RW^v{'o  
 BOOL bAdded=FALSE; CuO*>g^K[  
 for(int index=0;index<MAX_KEY;index++){ UKQ&TV}0  
  if(hCallWnd[index]==0){ 2.2a2.I1  
   hCallWnd[index]=hWnd; 3C[4!>|  
   HotKey[index]=cKey; 3Wxtxk._E  
   HotKeyMask[index]=cMask; :bDn.`KG#  
   bAdded=TRUE; {^MAdC_  
   KeyCount++; xKzFrP;/{  
   break; (NN14  
  } GZVl384@  
 } RAQ;O  
 return bAdded; '#::ba[9w  
} J}KktD@!O  
//删除热键 8"UG&wLT  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) IX?%H!i  
{ <+,0 G`  
 BOOL bRemoved=FALSE; VCRv(Ek  
 for(int index=0;index<MAX_KEY;index++){ tsVhPo]e0  
  if(hCallWnd[index]==hWnd){ cB=u;$k@*  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >:E-^t%  
    hCallWnd[index]=NULL; Ic!83-  
    HotKey[index]=0; 2]*~1d  
    HotKeyMask[index]=0; 'c{]#E1}  
    bRemoved=TRUE; &U)s%D8e;d  
    KeyCount--; CHP6H}#|g  
    break; Nb^:_0&H@  
   } P]{.e UB@c  
  } -"K:ve(K  
 } ;iNx@tz4  
 return bRemoved; pv SFp-:_  
} o`! :Q!+  
Cfb-:e$0  
; 2-kQK9  
  DLL中的钩子函数如下: Q&Ahr  
rL3Vogw'e  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) (gB=!1/|G  
{ bx e97]  
 BOOL bProcessed=FALSE; K -1~K  
 if(HC_ACTION==nCode) \ySc uT  
 {   NX_S  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 d'fpaLV  
   switch(wParam) (k.7q~:  
   {  e-=PT 1T`  
    case VK_MENU: 4!%LD(jB`B  
     MaskBits&=~ALTBIT; Y!$ z7K  
     break; oHnpwU  
    case VK_CONTROL: 6dp_R2zH~o  
     MaskBits&=~CTRLBIT; I;:_25WGC  
     break; )p9n|C  
    case VK_SHIFT: Gn4b\y%%  
     MaskBits&=~SHIFTBIT; $_5v^QL  
     break; 4aKy]zPoE  
    default: //judge the key and send message ZM`_P!G  
     break; <qt%MM [Y  
   } )pa|uH +N  
   for(int index=0;index<MAX_KEY;index++){ 1*b%C"C  
    if(hCallWnd[index]==NULL) @?? 6)C  
     continue; O G}&%NgH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Vs"Q-?  
    { %y+j~]^:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); --)[>6)I  
     bProcessed=TRUE; 8}T3Fig,q  
    } bkIA:2HX  
   } EA#!h'-s  
  } L-gF$it\*b  
  else if((lParam&0xc000ffff)==1){ //有键按下 E |3aiC,5  
   switch(wParam) {z_pL^S'52  
   { .6#2i <oPW  
    case VK_MENU: M4\Io]}-M  
     MaskBits|=ALTBIT; dL)5~V8s  
     break; k]5L\]>y  
    case VK_CONTROL: rdg1<Z  
     MaskBits|=CTRLBIT; -~ Q3T9+  
     break; H`@7o8oj1  
    case VK_SHIFT: &H{>7q#r  
     MaskBits|=SHIFTBIT; O0YGjS|d  
     break; 4q8%!\A+  
    default: //judge the key and send message $dw;Kj'\  
     break; '8 #*U  
   } dUSuhT  
   for(int index=0;index<MAX_KEY;index++){ 5L#M7E  
    if(hCallWnd[index]==NULL) x#j_}L!V;  
     continue; O v6=|]cW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8, ^UQ5x  
    { 7IH{5o\e  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); SoIMftX  
     bProcessed=TRUE; +?tNly`  
    } <{kj}nxz  
   } =&GV\ju  
  } !/j|\_O  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 S/jHyJ,  
   for(int index=0;index<MAX_KEY;index++){ oGJI3Oh  
    if(hCallWnd[index]==NULL) 6fyW6xv[,  
     continue; ?GZs5CnS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $hh=-#J8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -+/|  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 BJ/%{ C`g  
   } cG6+'=]3<  
  } \v Go5`  
 } 4+:u2&I  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); v)EJ|2`  
} r$zXb9a|<  
E;0"1 P|S  
  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: rt z(Jt{<  
F$C:4c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); C%"@|01cO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,3u19>2  
dtm@G|Ij  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 0nAS4Az  
`mVH94{+I  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [$X(i|6  
{ /qG?(3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 4esf&-gG  
 { HtlXbzN%)  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 (aLnbJeJ  
  SaveBmp(); 3:S"!F  
  return FALSE; up6LO7drW/  
 } 9AaixI  
 …… //其它处理及默认处理 **"sru;@=  
} $MHc4FE[  
ww*F}}(  
Emo]I[<&q  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 V qf}(3K0  
seim?LK  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 w:Vs$,  
wqsnyP/m  
  二、编程步骤 WJWhx4Hk  
Y&?]t  
  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"; r38CPdE;}  
1Mqz+@~11  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; GS@ wG  
+8"H%#~  
  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; h#>67gJV  
Im =E?t  
  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; &Jz%L^  
Q_S fFsY  
  5、 添加代码,编译运行程序。 3? "GH1e  
oc.x1<Nd  
三、程序代码 (RF6K6~  
;(A'XA4 6N  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL qabM@+m[  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) eZHi6v)i  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ =Ur/v'm  
#if _MSC_VER > 1000 ~W4<M:R  
#pragma once q4E{?  
#endif // _MSC_VER > 1000 3D3K:K!FK  
#ifndef __AFXWIN_H__ <GC:aG  
#error include 'stdafx.h' before including this file for PCH #cA}B L!3  
#endif _]NM@'e  
#include "resource.h" // main symbols %pdfGM 9g  
class CHookApp : public CWinApp WA+v&* ]  
{ mtp[]  
 public: f|EWu  
  CHookApp(); 6K &V}  
  // Overrides 3e"G.0vJ  
  // ClassWizard generated virtual function overrides f7L|Jc  
  //{{AFX_VIRTUAL(CHookApp) Xc.~6nYp  
 public: ^,50]uX_  
  virtual BOOL InitInstance(); @/~41\=e  
  virtual int ExitInstance(); qe0@tKim  
  //}}AFX_VIRTUAL ,}<v:!  
  //{{AFX_MSG(CHookApp) /#HY-b  
  // NOTE - the ClassWizard will add and remove member functions here. !&X}? NK  
  // DO NOT EDIT what you see in these blocks of generated code ! L/shF}<  
  //}}AFX_MSG +] uY  
  DECLARE_MESSAGE_MAP() a)xN(xp##  
}; ,PnEDQ|l  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); l\bBc, %jt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8d]= +n !  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /bVI'fT  
BOOL InitHotkey(); }'3V(;9  
BOOL UnInit(); WZ ZD  
#endif 2>mDT  
= hpX2/]  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. +`ZcYLg)#  
#include "stdafx.h" xH0Bk<`V:  
#include "hook.h" M@.1P<:h  
#include <windowsx.h> 5D'8 l@7  
#ifdef _DEBUG 5s0H4?S  
#define new DEBUG_NEW jtA Yp3M-$  
#undef THIS_FILE @0aUWG!k  
static char THIS_FILE[] = __FILE__; St?vd+(>  
#endif ^+pmZw9 0  
#define MAX_KEY 100 mZORV3bN  
#define CTRLBIT 0x04 ,ihTEw,t(  
#define ALTBIT 0x02 a/_ `1  
#define SHIFTBIT 0x01 3Z`oI#-x  
#pragma data_seg("shareddata") 4Hu.o7  
HHOOK hHook =NULL; p B )nQ5l'  
UINT nHookCount =0; 6(wpf^br2  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 1iz\8R:0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT sI`Lsd'V  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey  oo2VT  
static int KeyCount =0; OyVp 3O  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift " jy'Dpy0m  
#pragma data_seg() atY m.qb  
HINSTANCE hins; K@h v[4  
void VerifyWindow(); ")TI,a`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) )y8$-"D(it  
//{{AFX_MSG_MAP(CHookApp) s+4G`mq>*  
// NOTE - the ClassWizard will add and remove mapping macros here. 6$IAm#  
// DO NOT EDIT what you see in these blocks of generated code! q4VOK 'N  
//}}AFX_MSG_MAP LJT+tb?K  
END_MESSAGE_MAP() >%xJ e'  
J^u8d?>r  
CHookApp::CHookApp() [ %r :V"  
{ .L8S_Mz  
 // TODO: add construction code here, H -`7T;t~  
 // Place all significant initialization in InitInstance DS^PHk39  
} hD;[}8qN{  
|d8/ZD  
CHookApp theApp; 2/I^:*e  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) CFVe0!\  
{ &a O3N  
 BOOL bProcessed=FALSE; #[2]B8NZ  
 if(HC_ACTION==nCode) b" p,~{  
 { $U<xrN>O  
  if((lParam&0xc0000000)==0xc0000000){// Key up ,Xao{o(  
   switch(wParam) CfAX,f"ZP  
   { bd9]'  
    case VK_MENU: ,1od]]>(O  
     MaskBits&=~ALTBIT; 1Ocyrn  
     break; 5gi`&t`  
    case VK_CONTROL: @ %kCe>r  
     MaskBits&=~CTRLBIT; IGVNX2  
     break; .aF+>#V=Q  
    case VK_SHIFT: s fazrz`h  
     MaskBits&=~SHIFTBIT; #;H+Kb5O  
     break; .0nL; o  
    default: //judge the key and send message R}BHRmSQ  
     break; 1}9@aKM  
   } D guAeK  
   for(int index=0;index<MAX_KEY;index++){ eEXer>Rm   
    if(hCallWnd[index]==NULL) Q[S""P.Z|  
     continue; ><dSwwu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) EI]NOG 0  
    { ']>@vo4kK{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); JhIgq W2  
     bProcessed=TRUE; S's\M5  
    } [|e7oNT(Q  
   } {p+7QlgK  
  } Ly lw('zZ  
  else if((lParam&0xc000ffff)==1){ //Key down C;M.dd  
   switch(wParam) nxCwg>  
   { rk{DrbRx  
    case VK_MENU: <1>\?$)D  
     MaskBits|=ALTBIT; yX?& K}JI  
     break; RD<l<+C^~  
    case VK_CONTROL: UuW"  
     MaskBits|=CTRLBIT; Ydh]EO0'  
     break; 36e !je  
    case VK_SHIFT: #"=_GA^.{  
     MaskBits|=SHIFTBIT; l$z\8]x  
     break; ggfL d r  
    default: //judge the key and send message ?u"MsnCXYn  
     break; 9PIm/10pP^  
   } 8NWvi%g  
   for(int index=0;index<MAX_KEY;index++) pl%3RVpoc  
   { x)h5W+$  
    if(hCallWnd[index]==NULL) y#o ,Vg*V  
     continue; 3w#kvtDVm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +-1t]`9k4  
    { #toKT_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1 @tVfn}  
     bProcessed=TRUE; Y[#i(5w  
    } H0_hQ:K   
   } eo4;?z  
  } 1@im+R?a  
  if(!bProcessed){ Pl9/1YhD/  
   for(int index=0;index<MAX_KEY;index++){ aj85vON1`  
    if(hCallWnd[index]==NULL) 7FMO' 'x  
     continue; G BV]7.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) (%D*S_m'  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |/5j0  
   } %s6|w=.1  
  } )=8MO-{  
 } <:fjWy  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :D`ghXj  
} "WV]| TS"]  
@.6l^"L  
BOOL InitHotkey() Tl6%z9rY@  
{ `9SuDuw;s  
 if(hHook!=NULL){ e/'d0Gb-  
  nHookCount++; l1 fP@|  
  return TRUE; :''^a  
 } S;[9 hI+  
 else # XE`8$  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); #p_3j 0S  
  if(hHook!=NULL) Ew~piuj  
   nHookCount++; bsO78a~=P  
  return (hHook!=NULL); Ii_X^)IL(  
} fH-V!QYGF  
BOOL UnInit() >vF=}1_L  
{  A M8bem~  
 if(nHookCount>1){ o|F RG{TJ  
  nHookCount--; J39,x=8LL  
  return TRUE; GSj04-T"  
 } sN.h>bd  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 4 IuQQ  
 if(unhooked==TRUE){  df;-E  
  nHookCount=0; PBc.}TSGj  
  hHook=NULL; x<W`2Du  
 } Y; JV9{j  
 return unhooked; <iDqt5)N  
} jl YnV/ ]  
_1S^A0ft  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `uo'w:Q  
{ G'T/I\tB  
 BOOL bAdded=FALSE; u|t<f`ze  
 for(int index=0;index<MAX_KEY;index++){ F$T@OT6  
  if(hCallWnd[index]==0){ yu"enA  
   hCallWnd[index]=hWnd; LT']3w  
   HotKey[index]=cKey; l( /yaZ`  
   HotKeyMask[index]=cMask; 1$vsw  
   bAdded=TRUE; dP}=cZ~  
   KeyCount++; q'{LTg0kk  
   break; 3eX;T +|o  
  } U`Bw2Vdk]S  
 } Uv?s<  
 return bAdded; /2Q@M>  
} m08:EX P  
?UuJk  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) cD5c&+,&I  
{ (lBgW z  
 BOOL bRemoved=FALSE; ASME~]]?  
 for(int index=0;index<MAX_KEY;index++){ c~bi ~ f  
  if(hCallWnd[index]==hWnd){ tp"dho  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %QH "x`;  
    hCallWnd[index]=NULL; bAS('R;4  
    HotKey[index]=0; oVk*G  
    HotKeyMask[index]=0; '_!j9A]g  
    bRemoved=TRUE; Q[+&n*  
    KeyCount--; <J" 7ufHSQ  
    break; XG2&_u&  
   } #-?C{$2I  
  } 0]%0wbY1  
 } {YnR]|0&  
 return bRemoved; n%GlO KC  
} PEqO<a1Z8  
~$xLR/{y  
void VerifyWindow() WxwSb`U|  
{ _EMq"\ND  
 for(int i=0;i<MAX_KEY;i++){ -v"\WmcS  
  if(hCallWnd!=NULL){ F/GfEMSE  
   if(!IsWindow(hCallWnd)){ =8FV&|fP  
    hCallWnd=NULL; "|<6 bA  
    HotKey=0; 0Yk@O) x  
    HotKeyMask=0; k1Cx~Q)XC  
    KeyCount--; xdw"JS}  
   } v|r\kr k  
  } T;!7GW4E ?  
 } pt[H5  
} T 1'8<pJ^  
*9V;;bY#  
BOOL CHookApp::InitInstance() ~gU.z6us  
{ >b9nc\~  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ]*b}^PQM^  
 hins=AfxGetInstanceHandle(); )Lt|]|1B{  
 InitHotkey(); )\fAy  
 return CWinApp::InitInstance(); @ n<y[WA  
} 6;"^Id  
" o.V`Bj  
int CHookApp::ExitInstance() qIEe7;DO  
{ xe ng`!  
 VerifyWindow(); zGKDH=Yy ;  
 UnInit(); lFvRXV^+f  
 return CWinApp::ExitInstance(); 022nn-~  
} mY[s2t  
g+shz{3zvz  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file pe(31%(h  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) %g1{nGah  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ " p]bsJG  
#if _MSC_VER > 1000 Mle@.IIT  
#pragma once oJ|8~:)  
#endif // _MSC_VER > 1000 (Ic{C5'  
%tx~CD  
class CCaptureDlg : public CDialog MR8\'0]  
{ z@@w?>*  
 // Construction Lbb{z  
 public: K5X,J/n  
  BOOL bTray; 8$Igo$U-  
  BOOL bRegistered; FCO5SX#-g  
  BOOL RegisterHotkey(); 7+^9"k7  
  UCHAR cKey; zQY|=4NP  
  UCHAR cMask; Om #m":  
  void DeleteIcon(); 1O" Mo  
  void AddIcon(); yL =*yC  
  UINT nCount; ]WZ_~8  
  void SaveBmp(); Ml &Cr  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor r0 %WGMk2  
  // Dialog Data A4!IbJD,0  
  //{{AFX_DATA(CCaptureDlg) nsO!   
  enum { IDD = IDD_CAPTURE_DIALOG }; ~3p :jEM.[  
  CComboBox m_Key; r8PXdNg  
  BOOL m_bControl; ;uw`6 KJ  
  BOOL m_bAlt; p4} ,xQzB  
  BOOL m_bShift; eK]g FXk  
  CString m_Path; M#v#3:&5  
  CString m_Number; gcLwQ-  
  //}}AFX_DATA MDETAd  
  // ClassWizard generated virtual function overrides \ ) H}  
  //{{AFX_VIRTUAL(CCaptureDlg) G)qNu}  
 public: +<cvyg5U  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 8NY $Iw  
 protected: 9rhIDA(wc  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support N^,@s"g  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); kz4d"bTb  
  //}}AFX_VIRTUAL %3v:c|r  
  // Implementation {P'TtlEp  
 protected: tnx)_f  
  HICON m_hIcon; 'k|?M  
  // Generated message map functions v9Kx`{1L  
  //{{AFX_MSG(CCaptureDlg) "YIrqk  
  virtual BOOL OnInitDialog(); \;"$Z 9W  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Bvbv~7g (  
  afx_msg void OnPaint(); 'EsN{.l?  
  afx_msg HCURSOR OnQueryDragIcon(); &V. ps1  
  virtual void OnCancel(); F_8 < tA6  
  afx_msg void OnAbout(); .}KY*y  
  afx_msg void OnBrowse(); 8J60+2Wa  
  afx_msg void OnChange(); 5p9zl=mT  
 //}}AFX_MSG 8<cD+Jtj  
 DECLARE_MESSAGE_MAP() *e E&ptx1  
}; Obl']Hr{y9  
#endif :]?y,e%xu,  
RRYm.dMIw  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `o7m)T')  
#include "stdafx.h" 'G3;!xk$  
#include "Capture.h" :\ %.x3T'  
#include "CaptureDlg.h" 6U{&`8C  
#include <windowsx.h> IfyyA  
#pragma comment(lib,"hook.lib") 4[@`j{  
#ifdef _DEBUG li>`9qCmI  
#define new DEBUG_NEW o_un=ygU  
#undef THIS_FILE ,`<w#  
static char THIS_FILE[] = __FILE__; %lL^[`AR  
#endif uFd.2,XNP  
#define IDM_SHELL WM_USER+1 5)=XzO0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z4eu'.r-y~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [/.5{|&GSt  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; iUcDj:  
class CAboutDlg : public CDialog eBZ^YY<*g  
{ hdFIriE3  
 public: m%8idjnG  
  CAboutDlg(); -#yLH  
  // Dialog Data eK }AVz}k  
  //{{AFX_DATA(CAboutDlg) &<{=  
  enum { IDD = IDD_ABOUTBOX }; YuO-a$BP  
  //}}AFX_DATA JXR_klx  
  // ClassWizard generated virtual function overrides g.CUo:c  
  //{{AFX_VIRTUAL(CAboutDlg) $`J'Y>`  
 protected: C)2Waj}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JaC =\\B  
  //}}AFX_VIRTUAL .gPE Qc+D  
  // Implementation #N`~. 96  
 protected: zbL!q_wO  
  //{{AFX_MSG(CAboutDlg) r[P5 ufy2]  
  //}}AFX_MSG G]q1_q4P1?  
  DECLARE_MESSAGE_MAP() W/dl`UDY  
}; XqD/~_z;  
}*+?1kv  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) {fsU(Jj\  
{ ~WS;)Q0|  
 //{{AFX_DATA_INIT(CAboutDlg) I?sA)!8  
 //}}AFX_DATA_INIT 2{t i])  
} j(j o8  
;F)g r  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 'jv[Gcss3L  
{ eT??F  
 CDialog::DoDataExchange(pDX); n-q  
 //{{AFX_DATA_MAP(CAboutDlg) ?y( D_NtL  
 //}}AFX_DATA_MAP E\U6n""]  
} RfP>V/jy5  
} $:uN  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) OLAw Rha  
 //{{AFX_MSG_MAP(CAboutDlg) 2t h\%  
 // No message handlers n[zP}YRr  
 //}}AFX_MSG_MAP A?{ X5` y  
END_MESSAGE_MAP() _*b1]<  
g(d9=xq@k  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) /rsr|`#  
: CDialog(CCaptureDlg::IDD, pParent) XW!a?aLNX  
{ WBS~e  
 //{{AFX_DATA_INIT(CCaptureDlg) >YPC &@9   
  m_bControl = FALSE; G\8ps ~3T  
  m_bAlt = FALSE; OoKzPePWji  
  m_bShift = FALSE; LqnN5l@ _B  
  m_Path = _T("c:\\"); QN=a{  
  m_Number = _T("0 picture captured."); &h=O;?dO  
  nCount=0; #NZ\UmA  
  bRegistered=FALSE; "e WN5 2  
  bTray=FALSE; U1?*vwfKZ  
 //}}AFX_DATA_INIT ; z_ZZ(W  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \RcB,?OK  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Eq>3|(UT  
} w_30g6tA  
]w!gv /;  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ,fS}c pV  
{ @WIcH:_w-  
 CDialog::DoDataExchange(pDX); { 3=\x  
 //{{AFX_DATA_MAP(CCaptureDlg) MB42 3{j  
  DDX_Control(pDX, IDC_KEY, m_Key); _%G)Uz{3  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Yk',a$.S  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ]"SH pq  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); E\N?D  
  DDX_Text(pDX, IDC_PATH, m_Path); %mR roR6  
  DDX_Text(pDX, IDC_NUMBER, m_Number); (P;z* "q  
 //}}AFX_DATA_MAP 2mS3gk  
} e %VJ:Dj  
 <b7 4L  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) et|P5%G  
//{{AFX_MSG_MAP(CCaptureDlg) =j[zMO  
 ON_WM_SYSCOMMAND() !a&@y#x  
 ON_WM_PAINT() fm2,Mx6  
 ON_WM_QUERYDRAGICON() 8>.l4:`  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) DXPiC[g]  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) FY%v \`@1*  
 ON_BN_CLICKED(ID_CHANGE, OnChange) i3I'n*  
//}}AFX_MSG_MAP XGE:ZVpW  
END_MESSAGE_MAP() tqLn  A  
j?Ki<MD1  
BOOL CCaptureDlg::OnInitDialog() XCU.tWR:  
{ d%l_:M3  
 CDialog::OnInitDialog(); f$a%&X6"-  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @-dM'R6C  
 ASSERT(IDM_ABOUTBOX < 0xF000); Pf s_s6  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *0ZL@Kw  
 if (pSysMenu != NULL) M/GQQG;  
 { olPV"<;+pO  
  CString strAboutMenu; =w HU*mK  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 2XJn3wPi  
  if (!strAboutMenu.IsEmpty()) j&(2ze:=*$  
  { :5X1Tr= A  
   pSysMenu->AppendMenu(MF_SEPARATOR); "oZ]/(  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %FnaS u  
  } m%ZJp7C  
 } J_tj9+r^  
 SetIcon(m_hIcon, TRUE); // Set big icon D*+uH;ws  
 SetIcon(m_hIcon, FALSE); // Set small icon " @!z+x[8  
 m_Key.SetCurSel(0); XHu Y'\;-  
 RegisterHotkey(); g ]|K@sm  
 CMenu* pMenu=GetSystemMenu(FALSE); j""I,$t  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); )5Yv7x(K  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Z5juyzj  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 7sECbbJT  
 return TRUE; // return TRUE unless you set the focus to a control 5Cxh >,k  
} =ECw'  
`6V-a_8;[  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ) |`eCzCB  
{ Q+|8|V}w  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) )&di c6r  
 { zI/)#^SQ  
  CAboutDlg dlgAbout; 0wZ_;FN*-  
  dlgAbout.DoModal(); !xoN%5 !  
 } %&KJtKe  
 else "?_adot5v  
 { 'Im7^!-d  
  CDialog::OnSysCommand(nID, lParam); PbOLN$hP  
 } Iu6KW:x  
} "'H$YhY]  
Ju$=Tn  
void CCaptureDlg::OnPaint() `Z]Tp1U  
{ [^r0red  
 if (IsIconic()) iorKS+w"  
 { sZFIQ)b9  
  CPaintDC dc(this); // device context for painting F/9]{H  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); b_Ns Ch3@  
  // Center icon in client rectangle -jsNAQ  
  int cxIcon = GetSystemMetrics(SM_CXICON); 8 [i#x|`g  
  int cyIcon = GetSystemMetrics(SM_CYICON); vQ=W<>1   
  CRect rect; \a+F/I$hwa  
  GetClientRect(&rect); DX.u"&Mm  
  int x = (rect.Width() - cxIcon + 1) / 2; 7"F w8;k  
  int y = (rect.Height() - cyIcon + 1) / 2; \dj&4u3  
  // Draw the icon AfKJa DKf  
  dc.DrawIcon(x, y, m_hIcon); ~[XDK`B  
 } L%`~`3%n-  
 else jI@0jxF  
 { -e#YWMo(  
  CDialog::OnPaint(); B e+'&+  
 } {\22C `9t  
} #.p^ S0\pw  
a9z|ef  
HCURSOR CCaptureDlg::OnQueryDragIcon() "UVqkw,vt  
{ DUf=\p6`f  
 return (HCURSOR) m_hIcon; VKy:e.  
} B`OggdE  
9Ue3 %?~c  
void CCaptureDlg::OnCancel() b)@%gS\F  
{ 3F2> &p|7  
 if(bTray) 7k{Oae\$  
  DeleteIcon(); !\Jj}iX3_  
  CDialog::OnCancel(); 8}Rwf?B  
} fI} Z`*  
N8(xz-6  
void CCaptureDlg::OnAbout() 8r /]Q  
{ xdp!'1n."g  
 CAboutDlg dlg; |RwpIe8~  
 dlg.DoModal(); +U&aK dQs  
} E^L  
o:#l r{  
void CCaptureDlg::OnBrowse() 9F)v=  
{ W >eJGZ<  
 CString str; #C,M8~Q7  
 BROWSEINFO bi; i+T#z  
 char name[MAX_PATH]; G T#hqt'1x  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); i;xH  
 bi.hwndOwner=GetSafeHwnd(); BZEY^G  
 bi.pszDisplayName=name; tu6oa[s  
 bi.lpszTitle="Select folder"; $s.:wc^  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; yCkfAx8 ]  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); J]i=SX+ 9  
 if(idl==NULL) cv;&ff2%?  
  return; 4]nU%`Z1w  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <.( IJ  
 str.ReleaseBuffer(); Yo;/7gG>  
 m_Path=str; OQaM47"  
 if(str.GetAt(str.GetLength()-1)!='\\') c#nFm&}dm  
  m_Path+="\\"; .:Bjs*  
 UpdateData(FALSE); z=<T[Uy  
} /S1EQ%_  
r<V]MwO=  
void CCaptureDlg::SaveBmp() VaQ>g*(I  
{ ;%2/  
 CDC dc; m8$6FN  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 7CYu"+Ea  
 CBitmap bm; ,WA7Kp9  
 int Width=GetSystemMetrics(SM_CXSCREEN); 1"A1bK  
 int Height=GetSystemMetrics(SM_CYSCREEN); 3sc5meSu'  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 3v;o`Em&  
 CDC tdc; ??12 J#  
 tdc.CreateCompatibleDC(&dc); zkn K2e,$  
 CBitmap*pOld=tdc.SelectObject(&bm); AuUT 'E@E  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); @Ek''a$  
 tdc.SelectObject(pOld); m9ts&b+TE  
 BITMAP btm; F6h3M~uR  
 bm.GetBitmap(&btm); K+Q81<X~  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; UBqA[9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); hLGUkG?6G  
 BITMAPINFOHEADER bih; kt%9PGw  
 bih.biBitCount=btm.bmBitsPixel; <(`dU&&%"}  
 bih.biClrImportant=0; )5gcLD/zI  
 bih.biClrUsed=0; |\@e  
 bih.biCompression=0; ?{%P9I  
 bih.biHeight=btm.bmHeight; meu\jg  
 bih.biPlanes=1; "RuJlp  
 bih.biSize=sizeof(BITMAPINFOHEADER); OP]=MZP|  
 bih.biSizeImage=size; fJLlz$H  
 bih.biWidth=btm.bmWidth; -(~Tu>KaH  
 bih.biXPelsPerMeter=0; &>0=v  
 bih.biYPelsPerMeter=0; 5^cPG" 4@  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); mfFC@~|g  
 static int filecount=0; #9}KC 9f  
 CString name; QD]Vfj4+  
 name.Format("pict%04d.bmp",filecount++); mu)?SGpyE  
 name=m_Path+name; " jn@S-  
 BITMAPFILEHEADER bfh; 7oA$aJQ  
 bfh.bfReserved1=bfh.bfReserved2=0; rtv\Pf|  
 bfh.bfType=((WORD)('M'<< 8)|'B'); xb0hJ~e  
 bfh.bfSize=54+size; ^tsIgK^9H  
 bfh.bfOffBits=54; *!%y.$\cE  
 CFile bf; vi@a87w>  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Ttn=VX{ \  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); yxQxc5/X)  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #9EpQc[4  
  bf.WriteHuge(lpData,size); ]0by6hQ  
  bf.Close(); cf1Ve\(YGI  
  nCount++; .3qaaXeH  
 } suj? e6  
 GlobalFreePtr(lpData); GBtBmV/`  
 if(nCount==1) OJ8W'"`L&  
  m_Number.Format("%d picture captured.",nCount); NSHWs%Zc  
 else NLw#b?%  
  m_Number.Format("%d pictures captured.",nCount); 9X,dV7 yW  
  UpdateData(FALSE); Y oNg3  
} T nAd!  
d]VL( &  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) OgyETSN8C  
{ d?WA}VFU  
 if(pMsg -> message == WM_KEYDOWN) dMw7Lp&  
 { 0`"]mYH  
  if(pMsg -> wParam == VK_ESCAPE) 6g8{;6x  
   return TRUE; sn_]7d+ Q  
  if(pMsg -> wParam == VK_RETURN) YKf,vHau  
   return TRUE; T({:Y. A;  
 } C>$5<bx  
 return CDialog::PreTranslateMessage(pMsg); 8NudY3cU!  
} _ot4HmD  
h|yv*1/|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) LT!B]y  
{ qWKpnofa  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ v~q2D"  
  SaveBmp(); Ge@./SGT  
  return FALSE; ! 1C3{  
} );@Dr!H  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ V;L^q?v !  
 CMenu pop; =DvFY]9{  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 15r,_Gp8  
 CMenu*pMenu=pop.GetSubMenu(0); vi4u `  
 pMenu->SetDefaultItem(ID_EXITICON); ) I 4d_]&  
 CPoint pt; "w9`UFu%^e  
 GetCursorPos(&pt); !e&ZhtTuC  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); L-^vlP)Vu  
 if(id==ID_EXITICON) A`Z!=og=  
  DeleteIcon(); ]G1{@r)  
 else if(id==ID_EXIT) C16MzrB}(N  
  OnCancel(); l?NRQTG  
 return FALSE; :1q+[T/ @  
} Zn1+} Z@I  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); l] WV gu  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) <_uLf9j a  
 AddIcon(); t]P[>{y  
 return res; <>A:Oi3^  
} a k@0M[d  
@j`_)Y\  
void CCaptureDlg::AddIcon() oR5hMu;j+  
{ 2JYp.CJv  
 NOTIFYICONDATA data; 4wX{N   
 data.cbSize=sizeof(NOTIFYICONDATA); C<r7d [  
 CString tip; XPd>DH(Yc  
 tip.LoadString(IDS_ICONTIP); `i8osX[&p  
 data.hIcon=GetIcon(0); a~Sf~ka  
 data.hWnd=GetSafeHwnd(); nj!)\U  
 strcpy(data.szTip,tip); ~7Kqc\/H&I  
 data.uCallbackMessage=IDM_SHELL; r*N:-I~z  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =#&K\  
 data.uID=98; ?xGxr|+a  
 Shell_NotifyIcon(NIM_ADD,&data); &}nU#)IX  
 ShowWindow(SW_HIDE); \OHsCG27  
 bTray=TRUE; }.3F|H  
} J<p<5):R;  
'(5 &Sj/C  
void CCaptureDlg::DeleteIcon() z) yUBcq  
{ A5!j rSyv  
 NOTIFYICONDATA data; p \; * :  
 data.cbSize=sizeof(NOTIFYICONDATA); HD IB GG~  
 data.hWnd=GetSafeHwnd(); 8js5/G+  
 data.uID=98; [V  T&  
 Shell_NotifyIcon(NIM_DELETE,&data); {lT9gJ+  
 ShowWindow(SW_SHOW); im>Sxu@  
 SetForegroundWindow(); e,={!P"f  
 ShowWindow(SW_SHOWNORMAL); J|sX{/WT  
 bTray=FALSE; qo}-m7  
} m( C7Fa  
S]KcAz(fX  
void CCaptureDlg::OnChange() @BbZ(cZ*  
{ d;Z<")  
 RegisterHotkey(); >T%Jlj3ZG  
} ~cz] Rhq  
=%znY`0b56  
BOOL CCaptureDlg::RegisterHotkey() TgSU}Mf)a  
{ b3wE8Co  
 UpdateData();  $Tfq9  
 UCHAR mask=0; t LdBnf  
 UCHAR key=0; a^'1o9  
 if(m_bControl) y<m{eDV7  
  mask|=4; S6B(g_D|  
 if(m_bAlt) k;3Bv 6  
  mask|=2; GfUIF]X  
 if(m_bShift) &32qv` V_  
  mask|=1; ;DL|%-%;$r  
  key=Key_Table[m_Key.GetCurSel()]; b,Ed}Ir  
 if(bRegistered){ }9R45h}{<  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); nZfTK>)A0  
  bRegistered=FALSE; l$z[Vh^UU<  
 } xrA(#\}f$  
 cMask=mask;  .LEQ r)  
 cKey=key; j1N1c~2  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); *qAF#  
 return bRegistered; }; +'  
} >Gk<[0U  
^TyusfOz  
  四、小结 fPiq  
'd]9u9u  
  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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