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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: yp9vgUs  
  @T)kqT  
  一、实现方法 plN:QS$  
f0S$p R  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: =~yRgGwJ  
e#BxlC  
#pragma data_seg("shareddata") +~Wg@   
HHOOK hHook =NULL; //钩子句柄 {el,CT#  
UINT nHookCount =0; //挂接的程序数目 N3"O#C  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 crTRfqF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 +6-_9qRq  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey \I"n~h^_  
static int KeyCount =0; >sGIpER7  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 yzWVUqtXm  
#pragma data_seg() !-B$WAV  
^Q,-4\ec  
  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。 .|UIZwW0  
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  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: M 5c$  
]?c9;U  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR #7v=#Jco  
cKey,UCHAR cMask) 8GlRO4yd  
{ %^pm~ck!  
 BOOL bAdded=FALSE; \l-JU  
 for(int index=0;index<MAX_KEY;index++){ @;;3B  
  if(hCallWnd[index]==0){ b@X+vW{S  
   hCallWnd[index]=hWnd; <*_DC)&7 9  
   HotKey[index]=cKey; !KC4[;Y  
   HotKeyMask[index]=cMask; dj-/%MU  
   bAdded=TRUE; L NS O]\  
   KeyCount++; 03Uj0.Z|7  
   break; JIatRc?g  
  } E\1e8Wyh  
 } [[s^rC<d  
 return bAdded; `}.jH1Fx/m  
} U5:5$T,C  
//删除热键 /JjSx/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {iXQUj  
{ <I 0EjV  
 BOOL bRemoved=FALSE; #b,! N  
 for(int index=0;index<MAX_KEY;index++){ >1BDt:G36  
  if(hCallWnd[index]==hWnd){ p54 e'Zb  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0JE*|CtK  
    hCallWnd[index]=NULL; 7<0oK|~c#  
    HotKey[index]=0; o)WzZ,\F^J  
    HotKeyMask[index]=0; ?Gx-q+H  
    bRemoved=TRUE; JuDadIrd{  
    KeyCount--; QC Jf   
    break; X?7s  
   } =xjt PmZ5X  
  } m^$KDrkD  
 } JD)wxoeg  
 return bRemoved; |33_="  
} *RD<*l  
NCp]!=uM;  
RPw1i*  
  DLL中的钩子函数如下: oM!zeJNA  
mXT{c=N)w  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) t=IM"ZgfL  
{ 3ih:t'N-  
 BOOL bProcessed=FALSE; eIcIl2  
 if(HC_ACTION==nCode) uoq|l  
 { iw^"?:'%  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 nNhb,J  
   switch(wParam) _iH:>2p5R  
   {  uCjbb  
    case VK_MENU: ~.E r  
     MaskBits&=~ALTBIT; ^S:I38gR#q  
     break; x75 3o\u!  
    case VK_CONTROL: 5Z_aN|Xn  
     MaskBits&=~CTRLBIT; s+9b.  
     break; w|U 7pUz  
    case VK_SHIFT: 2Uy}#n|)r  
     MaskBits&=~SHIFTBIT; 72\o6{BiC  
     break; e@DVf  
    default: //judge the key and send message snVeOe#'S  
     break; `aL4YH-v  
   } D26A%[^O  
   for(int index=0;index<MAX_KEY;index++){ OSkBBo]~z  
    if(hCallWnd[index]==NULL) :?$<:  
     continue; =k2"1f~e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4Y{&y6  
    { w1)SuMFK_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .~%,eF;l$  
     bProcessed=TRUE; L[Y|K%;~  
    } 4EFP*7X  
   } +IM6 GeH  
  } xeSv+I-b  
  else if((lParam&0xc000ffff)==1){ //有键按下 y*j8OA.S  
   switch(wParam) GD<pqm`vVY  
   { tVHQ$jJY%  
    case VK_MENU: QD^"cPC)mM  
     MaskBits|=ALTBIT; pJ_>^i=  
     break; An=Q`Uxt/  
    case VK_CONTROL: U/:x<Y$ tj  
     MaskBits|=CTRLBIT; K@@Jt  
     break; A5YS "i  
    case VK_SHIFT: sX#7;,Ft7  
     MaskBits|=SHIFTBIT; l 5z8]/  
     break; C<hb{$@  
    default: //judge the key and send message Ts 3(,Y  
     break; B=hJ*;:p  
   } Yd$64d7,h  
   for(int index=0;index<MAX_KEY;index++){ !Nno@S P@  
    if(hCallWnd[index]==NULL) }9>X M  
     continue; v QL)I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `*Jw[Bnh8  
    { UE/N-K)`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \:-N<[  
     bProcessed=TRUE; q pFzK  
    } 0:k ~  lz  
   } b6gD*w <  
  } ^<nN~@j  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 -cnlj  
   for(int index=0;index<MAX_KEY;index++){ me/ae{  
    if(hCallWnd[index]==NULL) s`"ALn8m  
     continue; ! jb{q bq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Ab f=b<bu  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); w\3'wD!  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 dM3V2TT  
   } Is !DiB  
  } [8C6%n{W  
 } 7<c&)No;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); z/t:gc.  
} YP vg(T  
]qk/V:H:  
  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: B^G{k3]t  
Gg9NG`e6I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $[P>nRhW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); to*<W,I  
Q{Lsr,  
  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: uH-*`*  
A4W61f  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +kTa>U<?  
{ `g iCytv  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) D;Jb' Be  
 { k6 f;A  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 =7`0hS<@F  
  SaveBmp(); 4r [T pb  
  return FALSE; 6'6@VB  
 } <~Tlx:  
 …… //其它处理及默认处理 wp,z~raaS  
} y]`@%V2P  
S:"t]gbF =  
-W+67@(\8H  
  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。 Th%1eLQ  
b\w88=|  
  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。 PaFJw5f  
ft[g1  
  二、编程步骤 QPfS3%p`  
xW,(d5RtZ  
  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"; D4r5wc%  
<z|? C  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Al`[Iu&  
v=|BqG`  
  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; (K+TqJw  
m!:7ur:Y  
  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; bkl'0 p  
sz wXr  
  5、 添加代码,编译运行程序。 ^ >ca*g  
8Db~OYVJG  
三、程序代码 u hP0Zwn  
.>?["e#,  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL iEki<e/  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) N)h>Ie  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ /)de`k"  
#if _MSC_VER > 1000 xIrpGLPSh  
#pragma once ?4Z0)%6  
#endif // _MSC_VER > 1000 4T9hT~cT7  
#ifndef __AFXWIN_H__ q'2PG@  
#error include 'stdafx.h' before including this file for PCH C)z[Blt  
#endif &U xN.vl  
#include "resource.h" // main symbols im+2)9f  
class CHookApp : public CWinApp ^;s`[f|w  
{ ja7Z v[  
 public: }C7tlA8,7  
  CHookApp(); Bw*z4qb{yH  
  // Overrides uU.9*B=H9  
  // ClassWizard generated virtual function overrides 2,&lGyV#  
  //{{AFX_VIRTUAL(CHookApp) !Y]}& pUP  
 public: XU9=@y+|v  
  virtual BOOL InitInstance(); Ti3BlWQH  
  virtual int ExitInstance(); -t6d`p;dR  
  //}}AFX_VIRTUAL p!aeL}g`  
  //{{AFX_MSG(CHookApp) h0.Fstf]  
  // NOTE - the ClassWizard will add and remove member functions here. q qzQKN  
  // DO NOT EDIT what you see in these blocks of generated code ! R|+R4'  
  //}}AFX_MSG v[a#>!;s  
  DECLARE_MESSAGE_MAP() }aNiO85  
}; `FJnR~d  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); &{]%=stI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @L<[38  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); z{#F9'\&  
BOOL InitHotkey(); k)v[/#I  
BOOL UnInit(); 0"2 [I  
#endif M?cKt.t  
Yn<0D|S;X  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. xD\Km>|i  
#include "stdafx.h" CY>NU  
#include "hook.h" =|U2 }U;  
#include <windowsx.h> u\e#_*>  
#ifdef _DEBUG 3K?0PRg  
#define new DEBUG_NEW .v" lY2:N  
#undef THIS_FILE "{x~j \<  
static char THIS_FILE[] = __FILE__; u4<r$[]V  
#endif _).'SU)>  
#define MAX_KEY 100 2 !;4mij,  
#define CTRLBIT 0x04 :x{Q  
#define ALTBIT 0x02 3-mw-;.  
#define SHIFTBIT 0x01 tJwF h6  
#pragma data_seg("shareddata") L\Jl'r|  
HHOOK hHook =NULL; 7 YK+TGmU^  
UINT nHookCount =0; xapkhIW2\  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey kQ#eWk J,  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT p_z"Uwp  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ?UfZVyHv+  
static int KeyCount =0; "q`%d_  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ^TEODKS  
#pragma data_seg() *b)b#p  
HINSTANCE hins; Pj.~|5gnf  
void VerifyWindow(); 1!f'nS  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 6fV)8,F3  
//{{AFX_MSG_MAP(CHookApp) FvJSJ.;E,  
// NOTE - the ClassWizard will add and remove mapping macros here. %7d"()L  
// DO NOT EDIT what you see in these blocks of generated code! *.*:(7`  
//}}AFX_MSG_MAP lXPn]iLJ  
END_MESSAGE_MAP() ltrSTH,kL  
[*vN`AfE  
CHookApp::CHookApp() +E [bLz^  
{ @}?D<O8#"#  
 // TODO: add construction code here, +z D'r5  
 // Place all significant initialization in InitInstance OV/FQH;V  
} ;:|KfXiC8  
.]e6TFsrO  
CHookApp theApp; 5qr!OEF2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) cik@QN<[0  
{ GiZ'IDV  
 BOOL bProcessed=FALSE; {^f0RGJg9  
 if(HC_ACTION==nCode) `az`?`i7  
 { DXz8C -  
  if((lParam&0xc0000000)==0xc0000000){// Key up >slN:dr0:  
   switch(wParam) Dq?HUb^X  
   { 4:@|q:DR  
    case VK_MENU:  7q:bBS  
     MaskBits&=~ALTBIT; :b ;1P@W<  
     break; oPy zk7{  
    case VK_CONTROL: @c !67Z  
     MaskBits&=~CTRLBIT; O|RO j  
     break; @L!#i*> 9  
    case VK_SHIFT: )M N yOj  
     MaskBits&=~SHIFTBIT; SU'1#$69F  
     break; "|'`'W  
    default: //judge the key and send message 'q'Y:A?,  
     break; Qiw eM?-  
   } E E|zY%  
   for(int index=0;index<MAX_KEY;index++){ s~$4bN>LD  
    if(hCallWnd[index]==NULL) Gr@{p"./z  
     continue; ];d:z[\P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B ^(rUR  
    { :3>yr5a7-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Z{ Zox[/  
     bProcessed=TRUE; ^X;Xti  
    } HCIF9{o1j>  
   } &E &iaw!  
  } JGDUCb~  
  else if((lParam&0xc000ffff)==1){ //Key down !;aC9VhSU  
   switch(wParam) TcLaWf!c5  
   { 9H}iX0O  
    case VK_MENU: f5GR#3-h(  
     MaskBits|=ALTBIT; ,N7l/6  
     break; 0*;9CH=BE  
    case VK_CONTROL: E9d i  
     MaskBits|=CTRLBIT; KHus/M&0  
     break; Eb[H3v48,  
    case VK_SHIFT: Wx|6A#cg!  
     MaskBits|=SHIFTBIT; _Q}RElA  
     break; , q@(L  
    default: //judge the key and send message +Q!xEfpO;  
     break; lcT+$4zk.  
   } i)=89?8  
   for(int index=0;index<MAX_KEY;index++) EOnp!]Y  
   { )]b@eGNGj  
    if(hCallWnd[index]==NULL) &Y>~^$`J  
     continue; h NOYFH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Go+xL/f  
    { Y5i`pY/}#?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); E"1 ;i  
     bProcessed=TRUE; Sp~Gv>uMK  
    } ;*4tVp,  
   } h>^jq{yu  
  } WQLHjGehe  
  if(!bProcessed){ k`7.p,;}U  
   for(int index=0;index<MAX_KEY;index++){ af?\kBm  
    if(hCallWnd[index]==NULL) /Xu;/MMpd3  
     continue; zsMw5C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) f0mH|tI`  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;+ C o!L  
   } Zn<(,e  
  } emkMR{MY  
 } 3dX=xuQ%/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [zh4W*K_cq  
} L VU)W^  
iA%' ;V  
BOOL InitHotkey() zhA',p@K?_  
{ o! 2 n}C  
 if(hHook!=NULL){ uzVG q!'H  
  nHookCount++; ){Ciu[h  
  return TRUE; -lP )  
 } Ukh$`q}  
 else E*r  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); e\^g|60f_  
  if(hHook!=NULL) ~`~%(DA=  
   nHookCount++; 43{_Y]  
  return (hHook!=NULL); <*A|pns  
} M}=s3[d(,  
BOOL UnInit() %0+h  
{ 2|0Qk&  
 if(nHookCount>1){ wuBlFUSg  
  nHookCount--; WbC0H78]  
  return TRUE; )p/=u@8_f  
 } &O+sK4 P  
 BOOL unhooked = UnhookWindowsHookEx(hHook); F=-uDtQ <N  
 if(unhooked==TRUE){ b"R, p=M  
  nHookCount=0; J8GXI:y  
  hHook=NULL; xZ.~:V03\t  
 } e(OwS?K  
 return unhooked; C@TN5?Z  
} 2YE;m&  
[):{5hMA  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `2B*CMW{  
{ IgPV#  
 BOOL bAdded=FALSE; b(P HZCy#  
 for(int index=0;index<MAX_KEY;index++){ laUu"cS  
  if(hCallWnd[index]==0){ B\=SAi  
   hCallWnd[index]=hWnd; a"0B?3*r46  
   HotKey[index]=cKey; Kcscz,  
   HotKeyMask[index]=cMask; 8iMF8\  
   bAdded=TRUE; E^Q@9C<!d  
   KeyCount++; o }9M`[  
   break; g  ,/a6M  
  } ,s1&O`  
 } ;;EDN45  
 return bAdded; (v|r'B9 b  
} D+@-XU<Lp<  
zW*}`S "  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !Gln Q`T  
{ Zu\p;!e  
 BOOL bRemoved=FALSE; 89LpklD  
 for(int index=0;index<MAX_KEY;index++){ SQq6X63 \  
  if(hCallWnd[index]==hWnd){ (H&@u9K?a?  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ I#"t'=9H  
    hCallWnd[index]=NULL; A)\>#Dv  
    HotKey[index]=0; nkCecwzr-  
    HotKeyMask[index]=0; K^"w]ii=  
    bRemoved=TRUE; t9G}Yd[T  
    KeyCount--; T?W[Z_D  
    break; Cw 1 9y  
   } PV?]UUc'n<  
  } E|pk.  
 } {SF[I  
 return bRemoved; aRbx   
} ao)Ck3]  
%oAL  
void VerifyWindow() VBu8}}Ql  
{ .4wTjbO6  
 for(int i=0;i<MAX_KEY;i++){ Y.q>EUSH  
  if(hCallWnd!=NULL){ ?Q@L-H`  
   if(!IsWindow(hCallWnd)){ sa_R$ /H  
    hCallWnd=NULL; Q(lku"U'  
    HotKey=0; JxjP@nr  
    HotKeyMask=0; 'nMApPl  
    KeyCount--; c\M#5+1j  
   } 'g]hmE  
  } WElrk:b  
 } HeCcF+  
} \@i=)dA  
lj)f4zu  
BOOL CHookApp::InitInstance() "ml?7Xl,n  
{ C*7!dW6  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); !(Q l)C  
 hins=AfxGetInstanceHandle(); ,~- ?l7  
 InitHotkey(); M:_!w[NiLp  
 return CWinApp::InitInstance(); oAY_sg+  
} \E Z+#3u  
.8]Y-  
int CHookApp::ExitInstance() Y&s2C%jT  
{ }'lNi^"XL  
 VerifyWindow(); P<u"97@8a  
 UnInit(); $&IpX M]  
 return CWinApp::ExitInstance(); p'&*r2_ram  
} CN/IH   
f/ajejYo?,  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 7IW> >RBF  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) a+41Ojv (  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ {rC~ P  
#if _MSC_VER > 1000 JvkL37^ n:  
#pragma once @rO4y`  
#endif // _MSC_VER > 1000 snYr9O[E6  
Zm(dY*z5:J  
class CCaptureDlg : public CDialog A W)a">|  
{ '&by3y5w-3  
 // Construction H?uukmZl  
 public: ~GG?GB  
  BOOL bTray; aX^+ O,  
  BOOL bRegistered; f7J,&<<5w  
  BOOL RegisterHotkey(); nLy#|C  
  UCHAR cKey; Qw?+!-7TN  
  UCHAR cMask; }>&KUl  
  void DeleteIcon(); gDCOLDM  
  void AddIcon(); i[150g?K  
  UINT nCount; dig~J\  
  void SaveBmp(); dn,gZ"<  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?z/Vgk+9|  
  // Dialog Data K)S;:MLG=  
  //{{AFX_DATA(CCaptureDlg) EvE,Dm?h  
  enum { IDD = IDD_CAPTURE_DIALOG }; =Ikg.jYq&F  
  CComboBox m_Key; &[@\f^~  
  BOOL m_bControl; 5)'P'kVi7.  
  BOOL m_bAlt; vG Vd  
  BOOL m_bShift; `HW:^T  
  CString m_Path; by86zX  
  CString m_Number; Kt/)pc  
  //}}AFX_DATA O}Le]2'  
  // ClassWizard generated virtual function overrides @Doyt{|T  
  //{{AFX_VIRTUAL(CCaptureDlg) .T.5TMiOSq  
 public: IFuZ]CBz  
  virtual BOOL PreTranslateMessage(MSG* pMsg); H:S,\D?%2x  
 protected: <@, $hso7:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support HGDV O Jq  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); >SCGK_Cr2  
  //}}AFX_VIRTUAL +=P@HfVfiq  
  // Implementation 1n%8j*bJq  
 protected: 3qM Nl>>  
  HICON m_hIcon; 4]XI"-M^D  
  // Generated message map functions {'bip`U.  
  //{{AFX_MSG(CCaptureDlg) UG[e//m  
  virtual BOOL OnInitDialog(); 3071:W  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); #DI$Oc  
  afx_msg void OnPaint(); ;IZ?19Q  
  afx_msg HCURSOR OnQueryDragIcon(); 3/goCg  
  virtual void OnCancel(); 6*XM7'n  
  afx_msg void OnAbout(); LSd*| 3E}n  
  afx_msg void OnBrowse(); 8cVzFFQP  
  afx_msg void OnChange(); 5EeDHsvV9  
 //}}AFX_MSG yA7 )Y})>  
 DECLARE_MESSAGE_MAP() 5lmO:G1  
}; H\G{3.T.9  
#endif cT'w=  
fCUT[d+H  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [Ot,q/hBJ  
#include "stdafx.h" 3]LN;s]ac  
#include "Capture.h" JW+*d`8Z[  
#include "CaptureDlg.h" (> "QVxr  
#include <windowsx.h> ^toAw8A=@0  
#pragma comment(lib,"hook.lib") JMyTwj[7  
#ifdef _DEBUG f3PMVf:<  
#define new DEBUG_NEW z&+ zl6  
#undef THIS_FILE .BZVX=x  
static char THIS_FILE[] = __FILE__; FGanxv@15  
#endif 3h=8"lRc  
#define IDM_SHELL WM_USER+1 "pvZ,l>8f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Hi,t@!!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ffcLuXa  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @}LZ! y  
class CAboutDlg : public CDialog KL3<Iz]  
{ y?z\L   
 public: \0*l,i1&  
  CAboutDlg(); XGs^rIf  
  // Dialog Data &Cro2|KZhG  
  //{{AFX_DATA(CAboutDlg) VWf %v  
  enum { IDD = IDD_ABOUTBOX }; /iM$Tb5  
  //}}AFX_DATA 79 Bg]~}Z  
  // ClassWizard generated virtual function overrides ?y7w}W  
  //{{AFX_VIRTUAL(CAboutDlg) 3<(q }  
 protected: >Hwc,j q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 45+{nN[  
  //}}AFX_VIRTUAL @h?crJ6$  
  // Implementation &a)vdlZSE=  
 protected: kU*{4G|6  
  //{{AFX_MSG(CAboutDlg) 0Xl%uF+w  
  //}}AFX_MSG \cySWP[  
  DECLARE_MESSAGE_MAP() 'fW#7W  
}; Ka-p& Uv1<  
`~F5 wh~  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Plo,XU  
{  i g71/'D  
 //{{AFX_DATA_INIT(CAboutDlg) X>l*v\F9  
 //}}AFX_DATA_INIT G*n2Ii  
} j$@tK0P  
`rFAZcEj%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) mP}#Ccji?  
{ Np,2j KF(  
 CDialog::DoDataExchange(pDX); =,/D/v$m'2  
 //{{AFX_DATA_MAP(CAboutDlg) #$1$T  
 //}}AFX_DATA_MAP 4E3g,%9u  
} ecHP &Z$  
Wk7WK` >i  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) jj&s} _75  
 //{{AFX_MSG_MAP(CAboutDlg) tJZc/]%`H  
 // No message handlers d/U."V}  
 //}}AFX_MSG_MAP z@h~Vb&I  
END_MESSAGE_MAP() "^rNr_  
trYTs,KV  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) o'= VZT9  
: CDialog(CCaptureDlg::IDD, pParent) _6LoVS  
{ -T_\f?V88  
 //{{AFX_DATA_INIT(CCaptureDlg) _j ;3-m  
  m_bControl = FALSE; t&RruwN_;  
  m_bAlt = FALSE; O!F]^'!  
  m_bShift = FALSE; *"9<TSU%m  
  m_Path = _T("c:\\"); _%pAlo_6  
  m_Number = _T("0 picture captured."); 4<v;1   
  nCount=0; u<Xog$esu  
  bRegistered=FALSE; H~fdbR  
  bTray=FALSE;  .5Z_E O  
 //}}AFX_DATA_INIT /L~m#HxWU  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 hC<14  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); H{zPft  
} :7b-$fm  
;#QhQx  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <Oz66bTze  
{ W|R-J  
 CDialog::DoDataExchange(pDX); ,=By$.rr'  
 //{{AFX_DATA_MAP(CCaptureDlg) T@ 48qg  
  DDX_Control(pDX, IDC_KEY, m_Key); q)I|2~Q c^  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); yYTVXs`fVj  
  DDX_Check(pDX, IDC_ALT, m_bAlt); A"l{?;~  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); "yh Pm  
  DDX_Text(pDX, IDC_PATH, m_Path); ~"dhu]^  
  DDX_Text(pDX, IDC_NUMBER, m_Number);  ?J&)W,~  
 //}}AFX_DATA_MAP t_c?Wp~tH  
} J=}F2C   
v Xcy#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 7_)|I? =0d  
//{{AFX_MSG_MAP(CCaptureDlg) At9X]t  
 ON_WM_SYSCOMMAND() }T(z4P3  
 ON_WM_PAINT() G\~^&BAC  
 ON_WM_QUERYDRAGICON() *xH\)|3,  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 8vD3=yK%^  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) |4>:M\h  
 ON_BN_CLICKED(ID_CHANGE, OnChange) n9oR)&:o  
//}}AFX_MSG_MAP F!g;A"?V  
END_MESSAGE_MAP() w~@[ r4W  
 s>[{}7ca  
BOOL CCaptureDlg::OnInitDialog() p@I9< ^"  
{ >Y&KTSD"  
 CDialog::OnInitDialog(); vjlGXT`m  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); =*MR(b>  
 ASSERT(IDM_ABOUTBOX < 0xF000); vr IV%l=  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 2*OxA%QELM  
 if (pSysMenu != NULL) >&K!VQ{g  
 { 5h^[^*A?  
  CString strAboutMenu; ti_u!kNv  
  strAboutMenu.LoadString(IDS_ABOUTBOX); =ApY9`  
  if (!strAboutMenu.IsEmpty()) Q7a(P  
  { ?q$P>guH6-  
   pSysMenu->AppendMenu(MF_SEPARATOR); '2v f|CX  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !v>ew9  
  } XB/'u39  
 } 2 P}bG>M  
 SetIcon(m_hIcon, TRUE); // Set big icon U^$E'Q-VK  
 SetIcon(m_hIcon, FALSE); // Set small icon @ss):FwA  
 m_Key.SetCurSel(0); +R\~3uj[7  
 RegisterHotkey(); |63Y >U"  
 CMenu* pMenu=GetSystemMenu(FALSE); Bc ^4 T1  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); z`#_F}v,m/  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); o)I/P<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Fd8hGj1  
 return TRUE; // return TRUE unless you set the focus to a control d*-Xuv  
} =AkX4k  
x_:hii?6V  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) nVOqn\m-  
{ v33T @  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) J(9=T<%T  
 { p_6P`Yx^e  
  CAboutDlg dlgAbout; A*0*sZ0  
  dlgAbout.DoModal(); {ymb\$f  
 } r{ @ `o@q  
 else (%DRt4u <H  
 { =K'L|QKF  
  CDialog::OnSysCommand(nID, lParam); s[V `e2O  
 } vLn> 4SK  
} <\D Uo0]J  
GOr}/y;  
void CCaptureDlg::OnPaint() VGJDqm!  
{ $u5.!{Wq?  
 if (IsIconic()) !: |nI77|  
 { fM:80bn L+  
  CPaintDC dc(this); // device context for painting ^5x4q  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); [%~NM/xu<  
  // Center icon in client rectangle shK&2Noan  
  int cxIcon = GetSystemMetrics(SM_CXICON); \=g!$  
  int cyIcon = GetSystemMetrics(SM_CYICON); %ck`0JZAP  
  CRect rect; wAz,vq=x  
  GetClientRect(&rect); 78w4IICk  
  int x = (rect.Width() - cxIcon + 1) / 2; -\,VGudM}  
  int y = (rect.Height() - cyIcon + 1) / 2; gKQ@!U U8  
  // Draw the icon +]L)>$6  
  dc.DrawIcon(x, y, m_hIcon); (Y;'[.  
 } P>W8V+l![  
 else i'HST|!j  
 { uI9lK  
  CDialog::OnPaint(); +Ag#B*   
 } h/=-tr  
} t>oM%/H  
5KaSWw/  
HCURSOR CCaptureDlg::OnQueryDragIcon() 9|a)sb7/  
{ $4h04_"  
 return (HCURSOR) m_hIcon; ~UW{)]_jox  
} Q9q9<J7j$  
FB!z#Eim  
void CCaptureDlg::OnCancel() va+m9R0  
{ =n)#!i  
 if(bTray) rgn|24x  
  DeleteIcon(); {~1M  
  CDialog::OnCancel(); ? ,V;f2c  
} Z@nmjji  
n}5x-SxS0  
void CCaptureDlg::OnAbout() _w%s(dzk  
{ I,9~*^$  
 CAboutDlg dlg; dw99FA6  
 dlg.DoModal(); !Iko0#4i  
} v1K4$&{F  
.m'N7`VB  
void CCaptureDlg::OnBrowse() c8\g"T  
{ L]NYYP-  
 CString str; 3H <`Z4;  
 BROWSEINFO bi; gQCC>8  
 char name[MAX_PATH]; C=EhY+5  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 8fEAYRGd  
 bi.hwndOwner=GetSafeHwnd(); c0hdLl;5  
 bi.pszDisplayName=name; eo]a'J9(  
 bi.lpszTitle="Select folder"; x"!#_0TT}  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; GiFf0c 9  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); J ZNyC!u  
 if(idl==NULL) dr>]+H=3E  
  return; cWc$ yE'  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); t5A[o7BS  
 str.ReleaseBuffer(); /gF]s_  
 m_Path=str; BDnBBbBrz  
 if(str.GetAt(str.GetLength()-1)!='\\') EyPy*_A  
  m_Path+="\\"; i&5!9m`Cw  
 UpdateData(FALSE); 9Mut p4#  
} +@^47Xu^  
14;Av{Xt  
void CCaptureDlg::SaveBmp() '9Qd.q7s|b  
{ E.Pje@d  
 CDC dc; \O,j}O'  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); -ca]Q|m8  
 CBitmap bm; 81cv:|"  
 int Width=GetSystemMetrics(SM_CXSCREEN); L1:}bH\y  
 int Height=GetSystemMetrics(SM_CYSCREEN);  *X0K2|  
 bm.CreateCompatibleBitmap(&dc,Width,Height); %Ln?dF+  
 CDC tdc; iiQ||P}5  
 tdc.CreateCompatibleDC(&dc); ^$6bs64FSm  
 CBitmap*pOld=tdc.SelectObject(&bm);  bsD'\  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); #d$d&W~gE  
 tdc.SelectObject(pOld); <vO8_2,V-  
 BITMAP btm; <w%DyRFw3  
 bm.GetBitmap(&btm); c|3h|  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Dt (:u,%  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); s2 wwmtUCN  
 BITMAPINFOHEADER bih; _{3k+DQ  
 bih.biBitCount=btm.bmBitsPixel; =+k&&vOAn  
 bih.biClrImportant=0; [v~Uy$d\  
 bih.biClrUsed=0; dcM+ylB  
 bih.biCompression=0; VQ/ <09e  
 bih.biHeight=btm.bmHeight; *%z<P~}  
 bih.biPlanes=1; 2>`m<&y  
 bih.biSize=sizeof(BITMAPINFOHEADER); 8o%E&Jg:  
 bih.biSizeImage=size; M_|M&lR>  
 bih.biWidth=btm.bmWidth; )m oo?Q  
 bih.biXPelsPerMeter=0; Py}!C@e  
 bih.biYPelsPerMeter=0; M55e=  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?%_]rr9  
 static int filecount=0; oR4fK td  
 CString name; iRkOH]+K  
 name.Format("pict%04d.bmp",filecount++); t Qp* '  
 name=m_Path+name; xu0;a  
 BITMAPFILEHEADER bfh; Y+}OClS  
 bfh.bfReserved1=bfh.bfReserved2=0; !#l0@3  
 bfh.bfType=((WORD)('M'<< 8)|'B'); XtnIK  
 bfh.bfSize=54+size; #wq;^)>  
 bfh.bfOffBits=54; F<H`8*q9  
 CFile bf; %'$cH$%~J  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ *#3voJjV(  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ^Osd/g  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); $#g#[ /  
  bf.WriteHuge(lpData,size); qYQUr8{  
  bf.Close(); xF2f/y   
  nCount++; N}eU.#L  
 } Y*h`),  
 GlobalFreePtr(lpData); ,dGFX]P  
 if(nCount==1) ,S7~=S  
  m_Number.Format("%d picture captured.",nCount); :qt82tbn  
 else 6:8EZ' y  
  m_Number.Format("%d pictures captured.",nCount); }UJdE#4  
  UpdateData(FALSE); }7f 1(#{7  
} S" I#>^  
H@ 1[SKBl  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) kG_&-b  
{ e2,<,~_K6  
 if(pMsg -> message == WM_KEYDOWN) \emT:Frb  
 { ^F;Z%5P=  
  if(pMsg -> wParam == VK_ESCAPE) \H"/2o%l")  
   return TRUE; Oi+Qy[y2  
  if(pMsg -> wParam == VK_RETURN) Y)@oo=oG  
   return TRUE; =[v2   
 } B' P,?`  
 return CDialog::PreTranslateMessage(pMsg); b tr x?k(  
} ROlzs}  
9;m#>a@Y  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Cb!`0%G  
{ NzwGc+\7}  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ W0p#Y h:{_  
  SaveBmp(); s /k  
  return FALSE; ?eY chVq  
} eB}sg4  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ H >@JfYZ0  
 CMenu pop; "!w[U{  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1+.y,}F6b  
 CMenu*pMenu=pop.GetSubMenu(0); kV]%Q3t  
 pMenu->SetDefaultItem(ID_EXITICON); FC jYTGA  
 CPoint pt; h|$zHm  
 GetCursorPos(&pt); & y 2GQJE  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); }lr fO_  
 if(id==ID_EXITICON) bUZ&}(/  
  DeleteIcon(); z[<pi :  
 else if(id==ID_EXIT) : .UX[!^  
  OnCancel(); k;AV;KWI'  
 return FALSE; tZ*f~yW  
} &~D.")Dz  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); @et3}-c  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) -jklH/gF\%  
 AddIcon(); ^OGH5@"  
 return res; ocDVCCkxg  
} !X#3w-K  
PgGrk5;  
void CCaptureDlg::AddIcon() e!L sc3@  
{ )PLc+J.I  
 NOTIFYICONDATA data; l[x`*+ON:2  
 data.cbSize=sizeof(NOTIFYICONDATA); "' i [~  
 CString tip; UJyiRP:#]>  
 tip.LoadString(IDS_ICONTIP); b(.o|d/P  
 data.hIcon=GetIcon(0); yx`r;|ds}  
 data.hWnd=GetSafeHwnd(); ]#WX|0''^  
 strcpy(data.szTip,tip); Hme@9(zD.  
 data.uCallbackMessage=IDM_SHELL; SFm.<^6  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; q>Ar.5&M_  
 data.uID=98; `G:qtHn"Q<  
 Shell_NotifyIcon(NIM_ADD,&data); ?_<UOb*  
 ShowWindow(SW_HIDE); @)!1#^(}%  
 bTray=TRUE; #L)4 |  
} {f6A[ZO;J  
^LQ lfd  
void CCaptureDlg::DeleteIcon() gIf+.^/m1  
{ IhFw{=2*  
 NOTIFYICONDATA data; NnSI)*%'  
 data.cbSize=sizeof(NOTIFYICONDATA); c^q O@%s  
 data.hWnd=GetSafeHwnd(); VN55!l'OV  
 data.uID=98; rg]A_(3Bb  
 Shell_NotifyIcon(NIM_DELETE,&data); II f >z_m  
 ShowWindow(SW_SHOW); ]#Z$jq{,  
 SetForegroundWindow(); Q& unA3  
 ShowWindow(SW_SHOWNORMAL); /=O+/)l`  
 bTray=FALSE; UmHJ/DI@  
} @,f,tk=\S  
J*W;{Vty  
void CCaptureDlg::OnChange() `HZHVV$~  
{ hdNZ":1s  
 RegisterHotkey(); bI6V &Dd  
} \T#(rt\j  
C#u)$Ds  
BOOL CCaptureDlg::RegisterHotkey() p~{%f#V  
{ 2 3XAkpzp$  
 UpdateData(); B?zS_Ue  
 UCHAR mask=0; kgI.kT(=  
 UCHAR key=0; 1(\I9L&J   
 if(m_bControl) 2%No>w}/2  
  mask|=4; ]nr BmKB  
 if(m_bAlt) -uY:2  
  mask|=2; sn T4X  
 if(m_bShift) c Dh4@V  
  mask|=1; V IRv  
  key=Key_Table[m_Key.GetCurSel()]; 5a/ A_..+I  
 if(bRegistered){ AFF>r#e  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); }5c'ui!3H  
  bRegistered=FALSE; eVNBhR}HS  
 } t1_y1!u Q  
 cMask=mask; =dw*B  
 cKey=key; ;@;ie8H  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); W0,"V'C  
 return bRegistered; (H|d3  
} Ia>th\_&  
WaZ@  
  四、小结 y0y;1N'KK  
]NhWhJ:  
  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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