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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: ]#M/$?!]g2  
  I4CHfs"ar  
  一、实现方法 kYTOldfY2  
WkcH5[  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: l92!2$]b  
$ #t|(\  
#pragma data_seg("shareddata") XzN-slu!  
HHOOK hHook =NULL; //钩子句柄 xf[z EEt  
UINT nHookCount =0; //挂接的程序数目 6HB]T)n  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 A@\qoS[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 \/ X{n*Hw?  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 1wU=WE(kKZ  
static int KeyCount =0; f^ywW[dF  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 /H.(d 4C  
#pragma data_seg() \&# p1K(H  
{4o\S  
  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。 SAQs {M  
n8 GF8a  
  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: L;nZ0)@@l  
EK:Y2WZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR p5D5%B/  
cKey,UCHAR cMask) .O;!W<Ef$  
{ )Xq@v']%~9  
 BOOL bAdded=FALSE; HgS<Vxmq  
 for(int index=0;index<MAX_KEY;index++){ 65;|cmjv  
  if(hCallWnd[index]==0){ 4LJ]l:m  
   hCallWnd[index]=hWnd; zuU Q."#i  
   HotKey[index]=cKey; Q*,6X*W!~  
   HotKeyMask[index]=cMask; u~ Vs wXc4  
   bAdded=TRUE; JO}#f+w}  
   KeyCount++; f<) Ro$   
   break; (0X,Qwx  
  } -??!@R7V  
 } b1eK(F  
 return bAdded; ^! $} BY  
} A8#.1uEgNb  
//删除热键 /0Rt+`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (QA-"9v#i,  
{ .jLMl*6%:  
 BOOL bRemoved=FALSE; &S9f#Ui  
 for(int index=0;index<MAX_KEY;index++){ 0zlM.rjEZ  
  if(hCallWnd[index]==hWnd){ r.Y*{!t  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ e~tr^$/(  
    hCallWnd[index]=NULL; iLjuE)6-$  
    HotKey[index]=0; d3\OHkM0^  
    HotKeyMask[index]=0; 9k(*?!\;  
    bRemoved=TRUE; C+X)">/+L  
    KeyCount--; 2Px$0&VN  
    break; Y] D7i?3N  
   } 3D]2$a_d  
  } *(@L+D0N  
 } M@',3  
 return bRemoved; .vCY%0oE  
} ._8xY$l$  
dM$N1DB{U+  
bbfDt^  
  DLL中的钩子函数如下: N |OMj%Uk  
CpUI|Rs  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) g5lmUKlQ$0  
{ % JgRcx  
 BOOL bProcessed=FALSE; bE VO<x+  
 if(HC_ACTION==nCode) '*o7_Ez-{  
 { .Z(S4wV  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 %s~NQ;Y  
   switch(wParam) N1D6D$s0  
   {  8o*\W$K@  
    case VK_MENU: 5KL9$J9k  
     MaskBits&=~ALTBIT; |@T5$Xg]5  
     break; }:,o Y<  
    case VK_CONTROL: i6meY$l  
     MaskBits&=~CTRLBIT; Fw(b1d>E  
     break; ZXF AuF  
    case VK_SHIFT: 5`1(}  
     MaskBits&=~SHIFTBIT; */0vJz%<.M  
     break; Verbmeg&n  
    default: //judge the key and send message GnSgO-$"  
     break; { r< (t#  
   } W\ 1bE(AwZ  
   for(int index=0;index<MAX_KEY;index++){ : ;E7+m  
    if(hCallWnd[index]==NULL) 3i@ "D  
     continue; KdBq@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $V`KrA~]  
    { W+F<P@[u<$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2b 6? 9FX*  
     bProcessed=TRUE; iBGSBSeL&  
    } 3p?<iVE  
   } fPh}l  
  } F20wf1^  
  else if((lParam&0xc000ffff)==1){ //有键按下 vF*^xhh  
   switch(wParam) Dz"u8 f  
   { ? 6yF{!F*  
    case VK_MENU: 0)6i~MglY  
     MaskBits|=ALTBIT; IGh !d?D  
     break; Z@>=&  
    case VK_CONTROL: 7- *( a  
     MaskBits|=CTRLBIT; }[=xe(4]D  
     break; (<d&BV-"  
    case VK_SHIFT: 'S%} ?#J  
     MaskBits|=SHIFTBIT; [*Aqy76Qa  
     break; }skRlC  
    default: //judge the key and send message m>Yo 9/XpZ  
     break; 7d M6;`V^  
   } &;~2sEo,  
   for(int index=0;index<MAX_KEY;index++){ #Lhj0M;a  
    if(hCallWnd[index]==NULL) L&!g33J&  
     continue; Xh7~MU~X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'XZI{q2i  
    { hX>VVeIZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ${E[pT  
     bProcessed=TRUE; 0gwm gc/#  
    } %h/#^esi  
   } ^\7 x5gO  
  } 2$SofG6D}  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ]RJb;  
   for(int index=0;index<MAX_KEY;index++){ Oet#wp/I  
    if(hCallWnd[index]==NULL) yKe*<\  
     continue; &(H)gjH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) niBjq#bJi  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |%2/I>o  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 P*0nT  
   } z'\}/k+  
  } pjKl)q  
 } `lu"yF  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); U'Ja\Ek/f  
} w$(0V$l_  
P- `~]]  
  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: d0H  
Z3abem<Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); p^4;fD  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @LW xz  
#pDGaqeX  
  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: Bp$+ F/  
t=E|RYC(k  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !CVBG *E^l  
{ D_ Bx>G9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) O%fp;Y{`  
 { |$SvD2^  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $_URXI  
  SaveBmp(); :9!0 Rm  
  return FALSE; 9pl_V WrQ  
 } 4I:JaRT d  
 …… //其它处理及默认处理 O yH!V&w  
} @F3-Ugm  
Qa7S'(  
cyHak u+  
  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。 WFeMr%Zqh>  
${I@YSU  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 RaM#@D7  
jL7MmR#y5"  
  二、编程步骤 S$lmEJ_  
<igx[2X  
  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"; rjpafGCp  
OFQi&/  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 0r$hPmvv8  
4xAlaOw5M  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; _/sf@R  
CSX$Pk*  
  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; O"J.k&C<,  
H/@M  
  5、 添加代码,编译运行程序。 ,@'){V  
Dt~}9HrU  
三、程序代码 QIMv9;  
+U_-Lq )  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL \xO2WD  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) FbCZV3Y  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ |B{$URu  
#if _MSC_VER > 1000 ,5A>:2 zs  
#pragma once "{ QHWZ  
#endif // _MSC_VER > 1000 6JFDRsX>)?  
#ifndef __AFXWIN_H__ N>}K+M>  
#error include 'stdafx.h' before including this file for PCH {OhkuON  
#endif H-cBXp5z  
#include "resource.h" // main symbols YqY6\ mo  
class CHookApp : public CWinApp >NOYa3  
{ hRy }G'0  
 public: 'd.@4 9  
  CHookApp();  oRbYna?J  
  // Overrides }DUDA%U  
  // ClassWizard generated virtual function overrides j]?0}Z*  
  //{{AFX_VIRTUAL(CHookApp) );uZ4PNK/?  
 public: ^; V>}08  
  virtual BOOL InitInstance(); |YGiATD4DG  
  virtual int ExitInstance(); Bbt8fJA~  
  //}}AFX_VIRTUAL s[B6%DI/5  
  //{{AFX_MSG(CHookApp) 7 6i rb!-  
  // NOTE - the ClassWizard will add and remove member functions here. W$t}3Ru  
  // DO NOT EDIT what you see in these blocks of generated code ! 6:EH5IO  
  //}}AFX_MSG Kf?{GNE7  
  DECLARE_MESSAGE_MAP() F;Xq:e8  
}; xXU/m|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ~oW8GQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); WGG) mh&-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qnfRN'  
BOOL InitHotkey(); ma-Y'  
BOOL UnInit(); ='bmjXu  
#endif k+R?JWC:  
x"wM_hl5L  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. \lbiz4^>  
#include "stdafx.h" \IZ4( Z  
#include "hook.h" Tvx8l m '  
#include <windowsx.h> vYt:}$AE  
#ifdef _DEBUG 9c;lTl^4;  
#define new DEBUG_NEW {5tEsv  
#undef THIS_FILE / ?[gB:s  
static char THIS_FILE[] = __FILE__; TnU$L3k  
#endif ^)IL<S&h  
#define MAX_KEY 100 ;?lM|kK  
#define CTRLBIT 0x04 F",abp!  
#define ALTBIT 0x02 9MzkG87J  
#define SHIFTBIT 0x01 POg0=32  
#pragma data_seg("shareddata") 5 EuJ  
HHOOK hHook =NULL; PKM$*_LcGI  
UINT nHookCount =0; pnA]@FW  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey WmVw>.]@~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT MqBATW.pmJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 0l1]QD+Gc5  
static int KeyCount =0; :*Ggz|  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift h7]]F{r5  
#pragma data_seg() @1ta`7#  
HINSTANCE hins; pvR& ~g  
void VerifyWindow(); bSmaE7  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) }NBJ T4R  
//{{AFX_MSG_MAP(CHookApp) iCSM1W3  
// NOTE - the ClassWizard will add and remove mapping macros here. YTPmS\ H _  
// DO NOT EDIT what you see in these blocks of generated code! B*iz+"H  
//}}AFX_MSG_MAP Isgk  
END_MESSAGE_MAP() Sw( H]  
Rw{v"n  
CHookApp::CHookApp()  ~M^7qO  
{ ?.A/E?Oc  
 // TODO: add construction code here, 'MQGR@*  
 // Place all significant initialization in InitInstance GK+\-U)v  
} -Us% g  
U?^|>cMr  
CHookApp theApp; P_g0G#`4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) T\s#-f[x  
{ fG$.DvJuK  
 BOOL bProcessed=FALSE; RHAr[$  
 if(HC_ACTION==nCode) XXwhs-:o  
 { :=7'1H  
  if((lParam&0xc0000000)==0xc0000000){// Key up x7 1!r  
   switch(wParam) 5)v^ cR?&  
   { I2lZ>3X{  
    case VK_MENU: WblV`"~e  
     MaskBits&=~ALTBIT; FC(cXPX}  
     break; 'C>SyU  
    case VK_CONTROL: i8 ):0  
     MaskBits&=~CTRLBIT; D&m"~wI  
     break; >(ww6vk2  
    case VK_SHIFT: +}0*_VW  
     MaskBits&=~SHIFTBIT; eC`f8=V  
     break; 446hrzW>@  
    default: //judge the key and send message 8=o(nFJw  
     break; +2 o|#`)i  
   } nkj'AH"2  
   for(int index=0;index<MAX_KEY;index++){ 842+KLS  
    if(hCallWnd[index]==NULL) 2b,TkG8K  
     continue; @Be:+01z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?E_p,#9j)  
    { RTY4%6]O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5XUI7Q%  
     bProcessed=TRUE; BXv)zE=j  
    } d1La7|43u  
   } QIV~)`;  
  } ~JPzjE  
  else if((lParam&0xc000ffff)==1){ //Key down i@^`~vj  
   switch(wParam) <0 idG  
   { 4KSN;G  
    case VK_MENU: FH21mwV  
     MaskBits|=ALTBIT; J<*Mk  
     break; g):jZU]b  
    case VK_CONTROL: vm^# aoDB  
     MaskBits|=CTRLBIT; "K!BJQ  
     break; . mrRv8>$  
    case VK_SHIFT: }UdqX1jz  
     MaskBits|=SHIFTBIT; E d/O\v@  
     break; _NnO mwK7  
    default: //judge the key and send message *dTf(J  
     break; lFV|GJ  
   } g uWqHVSs  
   for(int index=0;index<MAX_KEY;index++) s(.-bjR  
   { ZxPAu%Y  
    if(hCallWnd[index]==NULL) ~2}ICU5  
     continue; 2^M+s\p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L [M8[~Hy  
    { {$:13AnK   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); x2wWp-Z  
     bProcessed=TRUE; '|?r&-5 h  
    } D?F5o^e"h<  
   } Zs|sPatV<  
  } ,VsCRp  
  if(!bProcessed){ 13kb~'+&r  
   for(int index=0;index<MAX_KEY;index++){ QaBXzf   
    if(hCallWnd[index]==NULL) XJ?z{gXJ  
     continue; +`3ZH9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -y*+G&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (UT*T  
   } w>Sz^_ h  
  } ( +hI   
 } 8N_rJ)f  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !`=?<Fl  
} 6e| 5qKr  
$*-L8An?  
BOOL InitHotkey() }0>/G?2Yp  
{ PW4Wn`u  
 if(hHook!=NULL){ 2U{RA' s  
  nHookCount++; .Q)"F /  
  return TRUE; K+OU~SED%F  
 } k ,(:[3J  
 else @+#p: sE  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); += ~}PF  
  if(hHook!=NULL) HbDB?s<  
   nHookCount++; &L~rq)r/&  
  return (hHook!=NULL); ?.ihWbW_  
} qW>J-,61/  
BOOL UnInit() #[yl;1)  
{ obolDh a  
 if(nHookCount>1){ E_rC"_Zte  
  nHookCount--; C8q-gP[  
  return TRUE; 8!>pFVNJf  
 } 6D(m8  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ,sl.:C4  
 if(unhooked==TRUE){ 6 74X)hB  
  nHookCount=0; CnYX\^Ow  
  hHook=NULL; rWqA)j*!  
 } m/nn}+*C  
 return unhooked; Wh_c<E}&  
} CI'5JOqP  
 E/;YhFb[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \c}r6xOr  
{ j=S"KVp9NF  
 BOOL bAdded=FALSE; [1CxMk~"[  
 for(int index=0;index<MAX_KEY;index++){ .utL/1Ej  
  if(hCallWnd[index]==0){ )^sfEYoA  
   hCallWnd[index]=hWnd; u;g}N'"  
   HotKey[index]=cKey; oP 0j>i,"&  
   HotKeyMask[index]=cMask; )~(_[='  
   bAdded=TRUE; yqI|BF`  
   KeyCount++; ~A4WuA  
   break; CNYchE,}  
  } uu.Nq*3  
 } e)"cm;BJ^P  
 return bAdded; &,7(Wab  
} m 0PF"(  
oX ,M;;Yq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) i`L66uV  
{ {rLOAewr  
 BOOL bRemoved=FALSE; ;A!i V |  
 for(int index=0;index<MAX_KEY;index++){ *2;3~8Y  
  if(hCallWnd[index]==hWnd){ L 3@wdC ~0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ c= u ORt>  
    hCallWnd[index]=NULL; mH .I!  
    HotKey[index]=0; +8I0.,'  
    HotKeyMask[index]=0; }3lF;k(2g  
    bRemoved=TRUE; 69yyVu_  
    KeyCount--; s. [${S6O  
    break; `,[c??h  
   } -',Y;0b%  
  } h%S#+t(Bf  
 } -wRzMT19MG  
 return bRemoved; d*HAKXd&:j  
} JH#+E04#  
k<H&4Z)d9  
void VerifyWindow() @("AkYPj  
{ l !v#6#iq  
 for(int i=0;i<MAX_KEY;i++){ v^ G5 N)F  
  if(hCallWnd!=NULL){ ?VsZo6Z"  
   if(!IsWindow(hCallWnd)){ +%v4Ci"%y  
    hCallWnd=NULL; ;7>--_?=  
    HotKey=0; S(l^TF  
    HotKeyMask=0; WcFZRy-erc  
    KeyCount--; ! +7ve[z  
   } H(s^le:!  
  } w2L)f,X  
 } b87o6"j  
} +\chHOsw  
C@i g3fhV  
BOOL CHookApp::InitInstance() s2WB4U k  
{ ps{(UYM=b  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); qcF{Kex"  
 hins=AfxGetInstanceHandle(); r_m&Jl@4  
 InitHotkey(); QCw<* Id+  
 return CWinApp::InitInstance(); WAbhB A  
} l1 S1CS  
K<tg+(3  
int CHookApp::ExitInstance() JnDR(s4(E  
{ add-]2`  
 VerifyWindow(); CjGI}t  
 UnInit(); A )cb  
 return CWinApp::ExitInstance(); HZ3<}`P_W  
} i1C'  
<0m;|Ai'W  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file R?Qou!*]  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) J:a^''  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ QR)eJ5<  
#if _MSC_VER > 1000 -(EqBr@_  
#pragma once :JYOC+#q7  
#endif // _MSC_VER > 1000 ] W_T(C*  
OH w6#N$\  
class CCaptureDlg : public CDialog 9'M_tMm5  
{ d?n~9_9e  
 // Construction =g:\R$lQ  
 public: jg(A_V  
  BOOL bTray; ->(B: Cz  
  BOOL bRegistered; _G|6xlO  
  BOOL RegisterHotkey(); XQA2uR4h  
  UCHAR cKey; SEmD's  
  UCHAR cMask; y (A"g3^=  
  void DeleteIcon(); bOdD:=f  
  void AddIcon(); %O${EN  
  UINT nCount; mVLGQlvVK  
  void SaveBmp(); BJ5#!I%h  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor #z.x3D@^r6  
  // Dialog Data 5{> cfN\q  
  //{{AFX_DATA(CCaptureDlg) MgekLP )&  
  enum { IDD = IDD_CAPTURE_DIALOG }; T$e_ao|  
  CComboBox m_Key; I f(_$>  
  BOOL m_bControl; uu>g(q?4II  
  BOOL m_bAlt;  a4yU[KK  
  BOOL m_bShift; NO1PGen  
  CString m_Path; s5HbuyR^  
  CString m_Number; 7^F?key?  
  //}}AFX_DATA LFC k6 R  
  // ClassWizard generated virtual function overrides !IS ,[  
  //{{AFX_VIRTUAL(CCaptureDlg) c LJCLKJ  
 public: 'zaB5d~l  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ]2jnY&a5  
 protected: e_I 8Jj4  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  e(^O8  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); C1J'. !  
  //}}AFX_VIRTUAL -_3.]o/J  
  // Implementation b%BwGS(z  
 protected: :vjbuqN]  
  HICON m_hIcon; {~SR>I3sv  
  // Generated message map functions y[cAU:P?  
  //{{AFX_MSG(CCaptureDlg) >7 |37a  
  virtual BOOL OnInitDialog(); kL-+V)Kl  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); -Da_#_F  
  afx_msg void OnPaint(); Sv ,_G'  
  afx_msg HCURSOR OnQueryDragIcon(); *sTQ9 Kr  
  virtual void OnCancel(); ]:;gk&P  
  afx_msg void OnAbout(); ":Q^/;D}U  
  afx_msg void OnBrowse(); <bH>\@p7}  
  afx_msg void OnChange(); Z& %61jGK  
 //}}AFX_MSG waC%o%fD  
 DECLARE_MESSAGE_MAP() VYBl0!t  
}; cmTZ))m  
#endif h4/rw fp^  
g5.Z B@j  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ]WG\+1x9  
#include "stdafx.h" <Wd$6  
#include "Capture.h" }\W3a_,v)  
#include "CaptureDlg.h" )JPcSy*  
#include <windowsx.h> "elh~K  
#pragma comment(lib,"hook.lib") vv u((b  
#ifdef _DEBUG {9)f~EbM!  
#define new DEBUG_NEW =k'dbcfO$9  
#undef THIS_FILE D|xSO~M5  
static char THIS_FILE[] = __FILE__; pnD#RvmW2e  
#endif EQ28pAZ  
#define IDM_SHELL WM_USER+1 X7G6y|4;w  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2eNm2;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); | 8AH_Fk  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; AA66^/t  
class CAboutDlg : public CDialog (<ejJPWT  
{ vq{:=:5'P  
 public: R1nctA:  
  CAboutDlg(); 8wBns)wy@  
  // Dialog Data |^1eL I  
  //{{AFX_DATA(CAboutDlg) jkbz8.K  
  enum { IDD = IDD_ABOUTBOX }; 6jn<YR E-  
  //}}AFX_DATA +RbCa c  
  // ClassWizard generated virtual function overrides aU3&=aN+  
  //{{AFX_VIRTUAL(CAboutDlg) M1^pW 63  
 protected: qAm%h\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0zd1:*KR,  
  //}}AFX_VIRTUAL i@2?5U>h  
  // Implementation |y]#-T?)t  
 protected: .Ee8s]h5W  
  //{{AFX_MSG(CAboutDlg) %>f:m!.  
  //}}AFX_MSG csC3Wm{v  
  DECLARE_MESSAGE_MAP() Z5+0?X0i  
}; ISl'g'o  
a^2?W  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) \^+sgg{  
{ Rzb] mM  
 //{{AFX_DATA_INIT(CAboutDlg) S4Rv6{r:  
 //}}AFX_DATA_INIT (]ORB0kl  
} znM"P|A  
S\C   
void CAboutDlg::DoDataExchange(CDataExchange* pDX) A%9"7]:   
{ 6)TFb,  
 CDialog::DoDataExchange(pDX); V3jx{BXs2  
 //{{AFX_DATA_MAP(CAboutDlg) A81kb  
 //}}AFX_DATA_MAP 03,+uf  
} Q>.-u6(&  
Y4i-Pp?  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4[6A~iC_  
 //{{AFX_MSG_MAP(CAboutDlg) '\9A78NV{;  
 // No message handlers $rdA0%;  
 //}}AFX_MSG_MAP `Z{7Ut^)  
END_MESSAGE_MAP() TPkm~>zD.  
xT@\FwPr  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 4Ld0AApncy  
: CDialog(CCaptureDlg::IDD, pParent) 5L4~7/kj  
{ SO}Hc;Q1`  
 //{{AFX_DATA_INIT(CCaptureDlg)  bSmRo  
  m_bControl = FALSE; ?vZ&CB  
  m_bAlt = FALSE; oV*3Mec  
  m_bShift = FALSE; 0n1y$*I4  
  m_Path = _T("c:\\"); uy B ?-Y+  
  m_Number = _T("0 picture captured."); Tj.;\a|d  
  nCount=0; BqR8%F  
  bRegistered=FALSE; a/?gp>M9  
  bTray=FALSE; <uA|nYpp  
 //}}AFX_DATA_INIT  iKDGYM  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 d/;oNC+  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); }ulFW]A^7  
} A}$A~g5 Ap  
utQ_!3u  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) s,0,w--=  
{ e'u 9 SpJ  
 CDialog::DoDataExchange(pDX); _$1W:!f4  
 //{{AFX_DATA_MAP(CCaptureDlg) ><$hFrR!  
  DDX_Control(pDX, IDC_KEY, m_Key); f~E'0f_  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); M'*  Y  
  DDX_Check(pDX, IDC_ALT, m_bAlt); & K7+V  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); }lWEbQ)(!  
  DDX_Text(pDX, IDC_PATH, m_Path); -PxA~((g5  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 4).q+{#k  
 //}}AFX_DATA_MAP #MI}KmH  
} ')go/y`YK  
)(,+o  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Pj+XKDV]T  
//{{AFX_MSG_MAP(CCaptureDlg) )'nGuL-w!i  
 ON_WM_SYSCOMMAND() b-ZvEDCR  
 ON_WM_PAINT() / VJ[1o^  
 ON_WM_QUERYDRAGICON() pTcm2-J  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) wJ+"JQY.J+  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) TVKuvKH8U  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 5 J 0  
//}}AFX_MSG_MAP [ h%ci3  
END_MESSAGE_MAP() *!Xhy87%Z)  
iX~V(~v  
BOOL CCaptureDlg::OnInitDialog() O"Ar3>   
{ 0e3 aWn  
 CDialog::OnInitDialog(); C#(4>'  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); V" I+E  
 ASSERT(IDM_ABOUTBOX < 0xF000); QarA.Ne~  
 CMenu* pSysMenu = GetSystemMenu(FALSE); RM,r0Kv17Y  
 if (pSysMenu != NULL) V7 c7(G  
 { z )k\p'0"  
  CString strAboutMenu; i5|!M IY  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?(hdV ?8)P  
  if (!strAboutMenu.IsEmpty()) yay{lP}b"  
  { RzNv|   
   pSysMenu->AppendMenu(MF_SEPARATOR); {V8 v  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ~GMlnA]6  
  } !K_%@|:7%  
 } > `u} G1T\  
 SetIcon(m_hIcon, TRUE); // Set big icon MLaH("aen  
 SetIcon(m_hIcon, FALSE); // Set small icon eFbr1IV  
 m_Key.SetCurSel(0); g3j@o/Y  
 RegisterHotkey(); WFy90*@Z  
 CMenu* pMenu=GetSystemMenu(FALSE); M" %w9)@  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); '@rGX+"  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8{@#N:SY  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); iYBs )  
 return TRUE; // return TRUE unless you set the focus to a control |odl~juU  
} O']-<E`1k  
p ^T0(\1  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $--W,ov5j  
{ 4R@3jGXb8q  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) `2 Vc*R  
 { }7k+tJ<   
  CAboutDlg dlgAbout; Fn$EP:>  
  dlgAbout.DoModal(); +.5 /4?  
 } |no '^  
 else *cJ GrLC  
 { 9aYCU/3  
  CDialog::OnSysCommand(nID, lParam);  H 2\KI(  
 } d+Pfi)+(I  
} BY6QJkI9x  
aw {?UvL&  
void CCaptureDlg::OnPaint() ]uj6-0q){W  
{ ho;Km  
 if (IsIconic()) sZ7{_}B  
 { EnZrnoGM  
  CPaintDC dc(this); // device context for painting %YA=W=Yd  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 4w\cS&X~C  
  // Center icon in client rectangle (+(YO\ng6  
  int cxIcon = GetSystemMetrics(SM_CXICON); ,J~kwJ$L  
  int cyIcon = GetSystemMetrics(SM_CYICON); cl30"WK!  
  CRect rect; td&W>(3d  
  GetClientRect(&rect); cYq<.A(hVj  
  int x = (rect.Width() - cxIcon + 1) / 2; ;)~loa1\  
  int y = (rect.Height() - cyIcon + 1) / 2; "\U$aaF  
  // Draw the icon o"J}@nF  
  dc.DrawIcon(x, y, m_hIcon); \XhzaM   
 } %Gv8 ]Yb  
 else O\=3{  
 { 5L%A5C&|  
  CDialog::OnPaint(); rhsSV3iM  
 } Z@=#ry  
} CFkM}`v0  
*dL!)+:d  
HCURSOR CCaptureDlg::OnQueryDragIcon() E_MGejm@  
{ G(EiDo&  
 return (HCURSOR) m_hIcon; SZea[~ &  
} 1|Us"GQ (n  
&AG,]#  
void CCaptureDlg::OnCancel() e@F9'z4  
{ $ohIdpZLH2  
 if(bTray) 7lqj" o(  
  DeleteIcon(); ;*[nZV>  
  CDialog::OnCancel(); 1Y_Cd  
} A90o X1l  
"(>P=  
void CCaptureDlg::OnAbout() ,GA2K .:#  
{ 8.ll]3))  
 CAboutDlg dlg; swntz  
 dlg.DoModal(); wWQv]c%  
} S9U,so?  
]4ya$%A  
void CCaptureDlg::OnBrowse() .'saUcVg:  
{ pZ}4'GnZI  
 CString str; eR4%4gW)  
 BROWSEINFO bi; }PTYNidlR  
 char name[MAX_PATH]; RHZ5f0b4L  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ri<E[8\  
 bi.hwndOwner=GetSafeHwnd(); 1D sgU6"  
 bi.pszDisplayName=name; 7loIX Qw  
 bi.lpszTitle="Select folder"; !'Q/9%g  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; |<t"O  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); s `B"qw  
 if(idl==NULL) lED-Jo2  
  return; h/j+ b.|  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); DDsU6RyN  
 str.ReleaseBuffer(); VPx"l5\  
 m_Path=str; _=Ed>2M)no  
 if(str.GetAt(str.GetLength()-1)!='\\') \cP\I5IW:s  
  m_Path+="\\"; >gtKyn]  
 UpdateData(FALSE); T \5 5uQ  
} bwR24>8lP  
hz\Fq1  
void CCaptureDlg::SaveBmp() X>(?  
{ tIR"y:U+  
 CDC dc; ( 6|S42  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); XbsEO>_Z'A  
 CBitmap bm; {7LO|E}7  
 int Width=GetSystemMetrics(SM_CXSCREEN); jO)UK.H#  
 int Height=GetSystemMetrics(SM_CYSCREEN); &`[y]E'  
 bm.CreateCompatibleBitmap(&dc,Width,Height); </ 3 Shq  
 CDC tdc; ]([:"j  
 tdc.CreateCompatibleDC(&dc); 4mq+{c0  
 CBitmap*pOld=tdc.SelectObject(&bm); 2"*7H S  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); K+5S7wFDZ  
 tdc.SelectObject(pOld); po~V{>fUm  
 BITMAP btm; ;cgc\xm>  
 bm.GetBitmap(&btm); @0S3`[/U  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; S\RjP*H*  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); %8NAWDb{  
 BITMAPINFOHEADER bih; #Cks&[!c  
 bih.biBitCount=btm.bmBitsPixel; "E =\Vz  
 bih.biClrImportant=0; lS&$86Jo(  
 bih.biClrUsed=0; 'yuM=Pb  
 bih.biCompression=0; :_E q(r  
 bih.biHeight=btm.bmHeight; 484lB}H  
 bih.biPlanes=1; mojD  
 bih.biSize=sizeof(BITMAPINFOHEADER); >DeG//rv  
 bih.biSizeImage=size; P$?3\`U;  
 bih.biWidth=btm.bmWidth; 20h|e+3  
 bih.biXPelsPerMeter=0; (=c R;\s<  
 bih.biYPelsPerMeter=0; +`O8cHx  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); :oh(M|;/2  
 static int filecount=0; u4*7 n-(  
 CString name; l3dGe'  
 name.Format("pict%04d.bmp",filecount++); RG1~)5AL~Y  
 name=m_Path+name; I?nj_ as  
 BITMAPFILEHEADER bfh; (;T$[ru`  
 bfh.bfReserved1=bfh.bfReserved2=0; !{tkv4  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ,y@`wq>O  
 bfh.bfSize=54+size; >Ng7q?h   
 bfh.bfOffBits=54; a "uO0LOb  
 CFile bf; gmkD'CX*A  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ )y&}c7xW  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); &"]Uh   
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !4cO]wh5  
  bf.WriteHuge(lpData,size); 69AgPAv<k  
  bf.Close(); H)tnxD0)  
  nCount++;  Cg[]y1Ne  
 } ~= qJSb  
 GlobalFreePtr(lpData); m2{3j[  
 if(nCount==1) i j&_>   
  m_Number.Format("%d picture captured.",nCount); @|kBc.(]  
 else $Ay j4|_-  
  m_Number.Format("%d pictures captured.",nCount); \lwYDPY:  
  UpdateData(FALSE); x-O9|%aRJ  
} :a3  +f5  
T 7`9[  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ov>Rvy  
{ wN1%;~?7  
 if(pMsg -> message == WM_KEYDOWN) gRA}sF  
 { 72@lDY4cE  
  if(pMsg -> wParam == VK_ESCAPE) c#X9d8>  
   return TRUE; +rse,b&U(  
  if(pMsg -> wParam == VK_RETURN) (GB2("p`  
   return TRUE; h&d%#6mB  
 } 2]W"sT[  
 return CDialog::PreTranslateMessage(pMsg); PF5;2  
} pJ kaP  
&iCE/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) vM@2C'  
{ z'N_9=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ~^jdiy5  
  SaveBmp(); .1R:YNx{/  
  return FALSE; _q*4+x  
} Du@?j7&l=$  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ .R5[bXxe7  
 CMenu pop; dE R#)bGj  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); z<2!|  
 CMenu*pMenu=pop.GetSubMenu(0); t}r`~AEa!  
 pMenu->SetDefaultItem(ID_EXITICON); &E|2-)  
 CPoint pt; d3Dw[4  
 GetCursorPos(&pt); gx+bKGB`  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); F)P"UQ!\  
 if(id==ID_EXITICON) _cra_(b  
  DeleteIcon(); cm^:3(yYX  
 else if(id==ID_EXIT) |^&n\vXv  
  OnCancel(); <-KHy`u  
 return FALSE; oL?(; `"&  
} ? tre)  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +%vBDcf  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6b1f ?0  
 AddIcon(); BZAeg">3  
 return res; 6f1%5&si  
} Fl{:aq"3  
u;1/.`NPB  
void CCaptureDlg::AddIcon() P2J{ Ml#  
{ Exir?G}\  
 NOTIFYICONDATA data; 3exv k  
 data.cbSize=sizeof(NOTIFYICONDATA); D4 {?f<G0F  
 CString tip; "JI FF_  
 tip.LoadString(IDS_ICONTIP); 5)X;q-  
 data.hIcon=GetIcon(0); ZI"L\q=|0#  
 data.hWnd=GetSafeHwnd(); _-/aMfyQ  
 strcpy(data.szTip,tip); S |SN3)  
 data.uCallbackMessage=IDM_SHELL; hT:+x3  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; -"J6 |Y#8  
 data.uID=98; :B(F ?9qK  
 Shell_NotifyIcon(NIM_ADD,&data); 3I!xa*u  
 ShowWindow(SW_HIDE); mEi+Tj zp  
 bTray=TRUE; &' ,A2iG  
} m8KJ~02l#  
!]c]:ed\C  
void CCaptureDlg::DeleteIcon() v=!Ap ; 2L  
{ 6{h+(|.(  
 NOTIFYICONDATA data; &0B< iO<f  
 data.cbSize=sizeof(NOTIFYICONDATA); d&S4`\g?8  
 data.hWnd=GetSafeHwnd(); /*g9drwaa  
 data.uID=98; ~"\qX+  
 Shell_NotifyIcon(NIM_DELETE,&data); 08)X:@ w?  
 ShowWindow(SW_SHOW); mmk]Doy?#  
 SetForegroundWindow(); 4R_Vi[i  
 ShowWindow(SW_SHOWNORMAL); HSq.0vYl6  
 bTray=FALSE; [$; \1P/  
} z{h#l!Edh  
}1]E=!?)&  
void CCaptureDlg::OnChange() :eaqUW!Y  
{ 3w&fN3 1  
 RegisterHotkey(); -TnvX(ok4  
} Fua:& 77  
T3po.Km\{  
BOOL CCaptureDlg::RegisterHotkey() :1%z;  
{ eL)* K>T  
 UpdateData(); Be"Swz(n  
 UCHAR mask=0; QuuR_Ao?c'  
 UCHAR key=0; |ocIp/ $  
 if(m_bControl) $HjKELoJ<  
  mask|=4; ?Y6MC:l<  
 if(m_bAlt) om3$=  
  mask|=2; -rE_pV;  
 if(m_bShift) =n $@  
  mask|=1; uP,{yna(  
  key=Key_Table[m_Key.GetCurSel()]; `x;8,7W;B  
 if(bRegistered){ ) V}q7\G~  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); @8zp(1.  
  bRegistered=FALSE; .54E*V1  
 } C+ {du^c$  
 cMask=mask; *We.?"X'].  
 cKey=key; ?O1:-vpZ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); qGndh  
 return bRegistered; g8+w?Zn}  
} ]TTX<R ZLr  
0,)Ao8  
  四、小结 y'sy]Q~  
J &,N1B  
  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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