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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: ;#G%U!p  
  0D(cXzQP  
  一、实现方法 mi2o1"Jd$`  
Gr(|Ra .  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 3|Y!2b(:?  
~tGCLf]c\  
#pragma data_seg("shareddata") C6& ( c  
HHOOK hHook =NULL; //钩子句柄 YTU.$t;Ez  
UINT nHookCount =0; //挂接的程序数目 ;S/7 h6  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 BvSIM%>h  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 i`O rMzL  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 1{2eY%+C  
static int KeyCount =0; !|m9|  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ! ]Mc4!E  
#pragma data_seg() \`,xgC9K  
Ca$c;  
  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。 RwTzz] M  
X^@[G8v%  
  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: BZ F,=v  
^i:\@VA:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ]R_G{%  
cKey,UCHAR cMask) cQFR]i  
{ twk&-:'  
 BOOL bAdded=FALSE; H*W):j}8  
 for(int index=0;index<MAX_KEY;index++){ %>XN%t'6aT  
  if(hCallWnd[index]==0){ xNN@1P[*  
   hCallWnd[index]=hWnd; hWcTI{v  
   HotKey[index]=cKey; i.rU&yT%  
   HotKeyMask[index]=cMask; z4} %TT@^  
   bAdded=TRUE; wh~s Z  
   KeyCount++; uf@U:V  
   break; 27#8dV?  
  } h#3m4<w(9  
 } |j_`z@7(  
 return bAdded; hE!7RM+Y  
} ]X" / yAn  
//删除热键 CJq c\I~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $ehg@WK}.  
{ `% E9xcD%  
 BOOL bRemoved=FALSE; "~p+0Xws9  
 for(int index=0;index<MAX_KEY;index++){ G+Dpma ]  
  if(hCallWnd[index]==hWnd){ ZcZ;$*  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ j.QHkI1.  
    hCallWnd[index]=NULL; IF?xnu  
    HotKey[index]=0; 5iWe-xQ>  
    HotKeyMask[index]=0; {:Vf0Mhb  
    bRemoved=TRUE; =p\Xy*  
    KeyCount--; ,sb1"^Wc  
    break; 6d{j0?mM  
   } ?TuI:dC  
  } P&t;WPZ  
 } Dc FCKji  
 return bRemoved; FWTx&Ip  
} wR7aQg  
+(ny|r[#  
p~bkf>  
  DLL中的钩子函数如下: d~[UXQC  
x9}++r  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !O\X+#j  
{ $au2%NL  
 BOOL bProcessed=FALSE; gEKO128  
 if(HC_ACTION==nCode) X7e/:._SAH  
 { sA_X<>vAKJ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 R[ yL _>  
   switch(wParam) z Z%/W)t  
   {  Uh+jt,RB`  
    case VK_MENU: zeTszT)  
     MaskBits&=~ALTBIT; v"k 4ATWP  
     break; AA7#c7  
    case VK_CONTROL: yzc pG6 ,  
     MaskBits&=~CTRLBIT; 1!s28C5u  
     break; &`PbO  
    case VK_SHIFT: j+1KNH  
     MaskBits&=~SHIFTBIT; >}F?<JB  
     break; L<@&nx   
    default: //judge the key and send message $'$>UFR  
     break; #K`B<2+T  
   } Bz]J=g7  
   for(int index=0;index<MAX_KEY;index++){ $GF&x>]]  
    if(hCallWnd[index]==NULL) @Qo,p  
     continue; A1<k1[5fJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {mYx  
    { #'NY}6cb$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); <R~KM=rL  
     bProcessed=TRUE; Cj$H[K}>  
    } d[U1.SNL  
   } Z1]"[U[;  
  } \Ut S>4w\  
  else if((lParam&0xc000ffff)==1){ //有键按下 NS 5 49S  
   switch(wParam) H^v{Vo  
   { \G=bj;&eF  
    case VK_MENU: \DyKtrnm%  
     MaskBits|=ALTBIT; gDhl-  
     break; ype"7p\  
    case VK_CONTROL: Y:%"K  
     MaskBits|=CTRLBIT; i;HH ! TaN  
     break; V~c(]K)-  
    case VK_SHIFT: kGj]i@(PA4  
     MaskBits|=SHIFTBIT; o*)@oU  
     break; g*r/u;  
    default: //judge the key and send message STp!8mL  
     break; 5V rcR=?O  
   } W^ClHQ"Iy  
   for(int index=0;index<MAX_KEY;index++){ `1_FQnm)  
    if(hCallWnd[index]==NULL) t>@yv#  
     continue; D'?]yyrf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \I xzdFF#  
    { 0nT%Slbih  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ct.Bg)E  
     bProcessed=TRUE; YUS?]~XC7x  
    } 165WO}(;/  
   } 2HVCXegq  
  } D`fc7m  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Wbs^(iUU}  
   for(int index=0;index<MAX_KEY;index++){ 9rWLE6 `  
    if(hCallWnd[index]==NULL) *lY+Yy(  
     continue; cqHw^{'8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) vK`S!7x'&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); oP,RlR  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ebbe=4  
   } &}|0CR.(  
  } \y,; Cfl<  
 } i/M+t~   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6DO0zNTY  
} Z#LUez;&t#  
o5V`'[c  
  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: x/[8Wi,yB  
K5+!(5V~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &{hc   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (mY(\mu}  
mC "7)&,F  
  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: 0. (zTJ  
r)%4-XeV  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %y3:SUOdx  
{ XNK 43fkB.  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) e)b r`CD%  
 { Cea"qNq=k  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 |H<|{{E  
  SaveBmp(); *\C}Ok=  
  return FALSE; 0 c, bet{m  
 } dgm+U%E  
 …… //其它处理及默认处理 }P16Xb)p  
} % M+s{ l  
/;b.-v&  
x1:vUHwC  
  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。 ;,FT&|3o  
O<Jwaap  
  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。 frk7^5  
8QPT\~  
  二、编程步骤 U=M#41J  
2kC^7ZAwu  
  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"; UVnrDhd!0  
V~JBZ}`TG<  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; *(>Jd|C  
Y<de9Z@  
  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; IZ|c <#r6  
O&F< oM  
  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; nO-d" S*  
2}GKHC  
  5、 添加代码,编译运行程序。  \8 g.  
1k0^6gE|  
三、程序代码 xqU^I5Z  
W6h NJb  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 'wegipK~R  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) QZqp F9Eu  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ j}i,G!-u  
#if _MSC_VER > 1000 d|R HG  
#pragma once W&WB@)ie  
#endif // _MSC_VER > 1000 KPD@b=F  
#ifndef __AFXWIN_H__ , &-S?|  
#error include 'stdafx.h' before including this file for PCH }#YIl@E  
#endif <r@bNx@T  
#include "resource.h" // main symbols R A*(|n>  
class CHookApp : public CWinApp NEZH<#  
{ IQ o]9Lx  
 public: s_x=^S3~LO  
  CHookApp(); iM4mkCdOO  
  // Overrides 7^`RP e^a+  
  // ClassWizard generated virtual function overrides nm<L&11  
  //{{AFX_VIRTUAL(CHookApp) p, !1 3X  
 public: (Be$$W  
  virtual BOOL InitInstance(); J!ln=h  
  virtual int ExitInstance(); |Tj`qJGVw  
  //}}AFX_VIRTUAL @+[Y0_  
  //{{AFX_MSG(CHookApp) 9Kq<\"7Bmz  
  // NOTE - the ClassWizard will add and remove member functions here. 2#,8evH  
  // DO NOT EDIT what you see in these blocks of generated code ! Y=PzN3  
  //}}AFX_MSG oM/B.U2a  
  DECLARE_MESSAGE_MAP() L; @a E[#z  
}; _a?wf!4>P  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); E `?S!*jm  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &;'w8_K"^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); JkRGtYq  
BOOL InitHotkey(); 9)8*FahW  
BOOL UnInit(); hB?U5J  
#endif wn&[1gBxM  
kO /~i  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. H0 {Mlu9  
#include "stdafx.h" bWhJ^L D  
#include "hook.h" s{b0#[  
#include <windowsx.h> >1_Dk7E0D  
#ifdef _DEBUG 2l]C55p)s  
#define new DEBUG_NEW :-W$PIBe  
#undef THIS_FILE JDIz28Ww  
static char THIS_FILE[] = __FILE__; VGq{y{(  
#endif pT|./ Fe  
#define MAX_KEY 100 H&"_}  
#define CTRLBIT 0x04 s0x@ u  
#define ALTBIT 0x02 kfH9Y%bOy  
#define SHIFTBIT 0x01 !NlB%cF  
#pragma data_seg("shareddata") j 8~Gv=(h  
HHOOK hHook =NULL; Y}eZPG.h  
UINT nHookCount =0; O~7p^i}  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey >$d d 9|[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ,C5@ P+A  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey eh8<?(eK  
static int KeyCount =0; @B}&62T  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift o{s4.LKK  
#pragma data_seg() W\d0  
HINSTANCE hins; PQr#G JG7  
void VerifyWindow(); #JX|S'\x  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 3<V.6'*k  
//{{AFX_MSG_MAP(CHookApp) %D%e:se  
// NOTE - the ClassWizard will add and remove mapping macros here. ua6*zop  
// DO NOT EDIT what you see in these blocks of generated code! XRX7qo(0g  
//}}AFX_MSG_MAP /v<e$0~s<  
END_MESSAGE_MAP() h8Dtq5t4  
d!a2[2Us  
CHookApp::CHookApp() BxW||O|_N"  
{ ;jpw"-J`  
 // TODO: add construction code here, r;@:S~  
 // Place all significant initialization in InitInstance 8' WLm  
} ^hGZVGSv  
LNsE7t  
CHookApp theApp; N^@%qUvT]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ur,V>J<5A  
{ 55u^u F  
 BOOL bProcessed=FALSE; 7z0;FW3>9  
 if(HC_ACTION==nCode) 3R Y|l?n>  
 { AZBY, :>D  
  if((lParam&0xc0000000)==0xc0000000){// Key up ]G$!/vXP  
   switch(wParam) +4p2KYO  
   { lcuH]z  
    case VK_MENU: .pNq-T  
     MaskBits&=~ALTBIT; =}6Z{}(TT  
     break; i&AXPq>`  
    case VK_CONTROL: jb6ZAT<8  
     MaskBits&=~CTRLBIT; Lt#:R\;&  
     break; Bk@_]a  
    case VK_SHIFT: $P1d#;rb%  
     MaskBits&=~SHIFTBIT; }&'yt97+  
     break; rK0|9^i{  
    default: //judge the key and send message \dQ2[Ek  
     break; [{Klv&>_/  
   } o9(#KC?3  
   for(int index=0;index<MAX_KEY;index++){ 8tB{rK,  
    if(hCallWnd[index]==NULL) NR@SDW  
     continue; Xj(k(>7V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) LT y@6*  
    { ;9- 4J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ).@)t:uNa  
     bProcessed=TRUE; }T^v7 LY  
    } |x}&wFV  
   } )gm\e?^   
  } \t 7zMp  
  else if((lParam&0xc000ffff)==1){ //Key down +q>C}9s3  
   switch(wParam) &  t @  
   { x Ps& CyI  
    case VK_MENU: ! a8h  
     MaskBits|=ALTBIT; Av[|.~g  
     break; &nY2u-Q  
    case VK_CONTROL: !'UsC6Y4  
     MaskBits|=CTRLBIT; e>s.mH6A  
     break; ^AC+nko*  
    case VK_SHIFT: lj%;d'  
     MaskBits|=SHIFTBIT; [s& y_[S  
     break; \&|w;  
    default: //judge the key and send message N'q/7jOy  
     break; u6CM RZ$  
   } zv3<i (  
   for(int index=0;index<MAX_KEY;index++) 4<!}4   
   { Yru1@/;  
    if(hCallWnd[index]==NULL) #0$eTdx#  
     continue; PSt|!GST  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A&@jA5Jb  
    { 8Gzs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Q'V,?#  
     bProcessed=TRUE; /E1c#@  
    } v \L Ip  
   } EXScqGa]  
  } OYCFx2{  
  if(!bProcessed){ ,4?|}xg  
   for(int index=0;index<MAX_KEY;index++){ YfYL?G  
    if(hCallWnd[index]==NULL) u8)r W  
     continue; ;z=C^'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^SelqX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6!Ap;O^*  
   } d+wNGN  
  } Y)-)NLLG;n  
 } P+ h<{%:*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); laIC}!  
} PT5ni6  
eWt>^]H~  
BOOL InitHotkey() E*#60z7F  
{ g\mrRZ/?  
 if(hHook!=NULL){ SGT-B.  
  nHookCount++; "}Sid+)<  
  return TRUE; ^a0 -5  
 } gB'Ah-@,P  
 else OA5md9P;d  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 97@?QI}  
  if(hHook!=NULL) QSQ\@h;E  
   nHookCount++; JT+lWhy  
  return (hHook!=NULL); $1`t+0^k  
} lKD<  
BOOL UnInit() 1x5CsmS  
{ L.~]qs|G/K  
 if(nHookCount>1){ 'jO-e^qT  
  nHookCount--; u\\niCNA  
  return TRUE; )^a#Xn3z  
 } [/`Hz]R  
 BOOL unhooked = UnhookWindowsHookEx(hHook); _TeRsA  
 if(unhooked==TRUE){ iPi'5g(a   
  nHookCount=0; "r(pK@h  
  hHook=NULL; DT~y^h  
 } 9kiy^0 7G  
 return unhooked; pHbguoH,  
} t~=@r9`S  
IF21T  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) oXOO 10  
{ 4Og GZ  
 BOOL bAdded=FALSE; in|7ucSlg  
 for(int index=0;index<MAX_KEY;index++){ fP4IOlHkE  
  if(hCallWnd[index]==0){ a5g{.:NfO  
   hCallWnd[index]=hWnd; RwLdV+2\R`  
   HotKey[index]=cKey; ^oZs&+z  
   HotKeyMask[index]=cMask; ,lGwW8$R  
   bAdded=TRUE; ?;kc%Rz  
   KeyCount++; =kkA  
   break; 0BZOr-i  
  } ~5?n&pF  
 } D&lXi~Z%.  
 return bAdded; -D':7!@  
} 9fLP&v  
h 7P?n.K  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [~%;E[ky$  
{ V$%Fs{  
 BOOL bRemoved=FALSE; D,R2wNF  
 for(int index=0;index<MAX_KEY;index++){ Hu!>RSg,,2  
  if(hCallWnd[index]==hWnd){ 7)X&fV6<8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~2qG" 1[\  
    hCallWnd[index]=NULL; /hy!8c7  
    HotKey[index]=0; dD2e"OIX  
    HotKeyMask[index]=0; dK`O,[}  
    bRemoved=TRUE; ?26[%%  
    KeyCount--; 3cQmxp2*  
    break; EJ|ZZYke!  
   } tQ<2K*3]  
  } Ji?UG@  
 } 4o8HEq!  
 return bRemoved; M L_J<|,J  
} ;SP3nU))  
-]MP,P%  
void VerifyWindow() tm#y `1-  
{ .VV!$; FB  
 for(int i=0;i<MAX_KEY;i++){ g5HqU2  
  if(hCallWnd!=NULL){ `6F8Kqltr  
   if(!IsWindow(hCallWnd)){ 9W r(w  
    hCallWnd=NULL; ~Q\uP(!D  
    HotKey=0; { J%$.D(/  
    HotKeyMask=0; DcM+K@1E4^  
    KeyCount--; `SbX`a0p2  
   } aQuy*\$$  
  } Ss/="jC  
 } mq} #{  
} <p8y'KAlc  
\0& (q%c  
BOOL CHookApp::InitInstance() ?Qp_4<(5  
{ im\Ws./  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); s'w 0pZqj  
 hins=AfxGetInstanceHandle(); 7oSuLo=  
 InitHotkey(); oW9rl]+  
 return CWinApp::InitInstance(); gVWLY;c 3}  
} QVhBHAw  
,6)y4=8 L  
int CHookApp::ExitInstance() cjpl_}'L:  
{ .Cd$=v6  
 VerifyWindow(); u _^=]K;  
 UnInit(); yXmp]9$  
 return CWinApp::ExitInstance(); $h f\ #'J  
} 5~5ypQj  
I[Y?f8gJ  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ~Q]M_,`M  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) tq93 2M4  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ M_uij$1-  
#if _MSC_VER > 1000 #&gy@!a~  
#pragma once t:n|0G(  
#endif // _MSC_VER > 1000 q+Q)IVaU81  
hY'%SV p  
class CCaptureDlg : public CDialog ;sJ2K"c  
{ <C xet~x  
 // Construction W%:zvqg v  
 public: zYJxoC{  
  BOOL bTray; '^AXUb  
  BOOL bRegistered; (J#3+I  
  BOOL RegisterHotkey(); 4 ETVyK|  
  UCHAR cKey; Kj5f:{Ur  
  UCHAR cMask; v#G ^W  
  void DeleteIcon(); #$QY[rf=6  
  void AddIcon(); ttRH[[E(  
  UINT nCount; zW.sXV,  
  void SaveBmp(); 9|DC<Zn&B#  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ;c}];ZU3G  
  // Dialog Data )2hoO_l:  
  //{{AFX_DATA(CCaptureDlg) k$/].P*!  
  enum { IDD = IDD_CAPTURE_DIALOG }; dy'?@Lj;  
  CComboBox m_Key; B&D z(Bs  
  BOOL m_bControl; jz0\F,s  
  BOOL m_bAlt; &Gl&m@-j  
  BOOL m_bShift; _FgeE`X  
  CString m_Path; !ZdUW]  
  CString m_Number; p:))ne:7  
  //}}AFX_DATA |+''d  
  // ClassWizard generated virtual function overrides HB:i0m2fJW  
  //{{AFX_VIRTUAL(CCaptureDlg) !9NAm?Fw  
 public: F*H}5yBp_:  
  virtual BOOL PreTranslateMessage(MSG* pMsg); R~([  
 protected: C]cw@:o%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support gd*?kXpt  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); WdnP[x9  
  //}}AFX_VIRTUAL ozG:f*{T  
  // Implementation eU0-_3gN_  
 protected: 9IV WbJ  
  HICON m_hIcon; ?i"FdpW  
  // Generated message map functions pj6Cvq4bD  
  //{{AFX_MSG(CCaptureDlg) %cL:*D4oz  
  virtual BOOL OnInitDialog(); TMBdneS-s  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); I&c#U+-A'  
  afx_msg void OnPaint(); RB!E>]   
  afx_msg HCURSOR OnQueryDragIcon(); nm.d.A/]Z  
  virtual void OnCancel(); %{"STbO#>  
  afx_msg void OnAbout(); hW&UG#PY>  
  afx_msg void OnBrowse(); hd' n"  
  afx_msg void OnChange(); N0f}q1S<-A  
 //}}AFX_MSG m~A/.t%=  
 DECLARE_MESSAGE_MAP() \8ZNXCP  
}; -D(!B56_  
#endif E83nEUs  
Cz%ih#^b  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 71InYIed  
#include "stdafx.h" YoA$Gw2  
#include "Capture.h" he #iWD'  
#include "CaptureDlg.h" C/=ZNl9"fn  
#include <windowsx.h> J^cDa|j  
#pragma comment(lib,"hook.lib") I(SE)%!%S  
#ifdef _DEBUG |)?T([  
#define new DEBUG_NEW *yx:nwmo  
#undef THIS_FILE FqfeH_-U  
static char THIS_FILE[] = __FILE__; l(W3|W#P  
#endif G 2##M8:U0  
#define IDM_SHELL WM_USER+1 ;d4_l:9p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ikC;N5Sw  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); fx},.P=:*  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; o\N}?Z,Kk  
class CAboutDlg : public CDialog Uan ;}X7@  
{ (ydeZx  
 public: iuEdm:pW  
  CAboutDlg(); ns-x\B?^  
  // Dialog Data %k_JLddlW  
  //{{AFX_DATA(CAboutDlg) @B6[RZR  
  enum { IDD = IDD_ABOUTBOX }; [sBD|P;M  
  //}}AFX_DATA _=b[b]Ec$s  
  // ClassWizard generated virtual function overrides w# ['{GL  
  //{{AFX_VIRTUAL(CAboutDlg) DWG}}vN:&  
 protected: h pU7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0ro+FJ r  
  //}}AFX_VIRTUAL a/1{tDA  
  // Implementation I5mS!m/X  
 protected: -oj@ c OZ  
  //{{AFX_MSG(CAboutDlg) tP9}:gu  
  //}}AFX_MSG ?a% u=G  
  DECLARE_MESSAGE_MAP() ?(z3/ "g]  
}; |NqQKot1  
lz>hP  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ej~ /sO  
{ 827N?pU$)  
 //{{AFX_DATA_INIT(CAboutDlg) |8"HTBb\CW  
 //}}AFX_DATA_INIT ofJ@\xS  
} 2rk_ ssvs  
z3,z&Ra  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) e=U7w7(s9  
{ \)bwdNWI  
 CDialog::DoDataExchange(pDX); c72/e7gV  
 //{{AFX_DATA_MAP(CAboutDlg) " 1 Bn/Q  
 //}}AFX_DATA_MAP Q_Rr5/  
} OoE@30+  
eL.S="  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &AzA0r&,  
 //{{AFX_MSG_MAP(CAboutDlg) t0Uax-E(  
 // No message handlers PF~&!~S>W  
 //}}AFX_MSG_MAP 4D8q Gti  
END_MESSAGE_MAP() f`Nu]#i  
{,m!%FDL  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) J<2N~$  
: CDialog(CCaptureDlg::IDD, pParent) |b@-1  
{ "-9YvB#  
 //{{AFX_DATA_INIT(CCaptureDlg) .._wTOSq  
  m_bControl = FALSE; B*{CcQ<5  
  m_bAlt = FALSE; KQk;:1hW  
  m_bShift = FALSE; $ _zdjzT  
  m_Path = _T("c:\\"); wS4zAu  
  m_Number = _T("0 picture captured."); F=cO=5Iz  
  nCount=0; g#e"BBm=A  
  bRegistered=FALSE; B}vI<?c  
  bTray=FALSE; q8U]Hyp(`  
 //}}AFX_DATA_INIT 1t6UI4U!$  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 X- zg  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); _.j KcDf  
} Gc>\L3u  
u+*CpKR}  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) o_cj-  
{ 5i0<BZDTef  
 CDialog::DoDataExchange(pDX); B!:(*lF  
 //{{AFX_DATA_MAP(CCaptureDlg) _M?:N:e  
  DDX_Control(pDX, IDC_KEY, m_Key); }Vt5].TA  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); {YkW5zC(L  
  DDX_Check(pDX, IDC_ALT, m_bAlt); wi!Ml4Sb  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); pl%ag~i5  
  DDX_Text(pDX, IDC_PATH, m_Path); >o@WT kF]  
  DDX_Text(pDX, IDC_NUMBER, m_Number); h' 16"j>  
 //}}AFX_DATA_MAP 8u>E(Vmpu  
} nD!^0?  
ZEB1()GB  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) %FwLFo^v  
//{{AFX_MSG_MAP(CCaptureDlg) PffRV7qU0  
 ON_WM_SYSCOMMAND()  @>BFhH  
 ON_WM_PAINT() ^T^fowt=r  
 ON_WM_QUERYDRAGICON() 9 eP @}C6  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) !=a8^CV  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ^ H'|iju  
 ON_BN_CLICKED(ID_CHANGE, OnChange) $Uzc  
//}}AFX_MSG_MAP @r#>-p  
END_MESSAGE_MAP() &.d~ M1Mz  
)ZT&V I  
BOOL CCaptureDlg::OnInitDialog() JV@>dK8  
{ ce@(Ct  
 CDialog::OnInitDialog(); -IPc;`<  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 2rA`y8g(L  
 ASSERT(IDM_ABOUTBOX < 0xF000); h4V.$e<T&  
 CMenu* pSysMenu = GetSystemMenu(FALSE); c| E  
 if (pSysMenu != NULL) k1X<jC]P  
 { ) +{'p0  
  CString strAboutMenu; A w83@U  
  strAboutMenu.LoadString(IDS_ABOUTBOX); L|v1=qNH4  
  if (!strAboutMenu.IsEmpty()) En1pz\'  
  { 7.]ZD`"Bb  
   pSysMenu->AppendMenu(MF_SEPARATOR); IKpNc+;p  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 67d0JQTu  
  } -E.EI@"  
 } AE@*#47  
 SetIcon(m_hIcon, TRUE); // Set big icon =_,w<  
 SetIcon(m_hIcon, FALSE); // Set small icon t.NG ]ejZ  
 m_Key.SetCurSel(0); J|s4c`=  
 RegisterHotkey(); #bnFR  
 CMenu* pMenu=GetSystemMenu(FALSE); /QTGZ b  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ~dC^|  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )5B90[M|t  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ) ~X\W\  
 return TRUE; // return TRUE unless you set the focus to a control 4rv3D@E  
} FX\ -Y$K  
m@OgT<E]_  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) c" yf>0  
{ >zXw4=J  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) V]IS(U(  
 { ndN 8eh:OR  
  CAboutDlg dlgAbout; P\SE_*&  
  dlgAbout.DoModal(); 1h|JKu0  
 } 8%Pjx7'<  
 else zL1H[}[z+  
 { fY\QI =  
  CDialog::OnSysCommand(nID, lParam); _uL m!ku  
 } Uc \\..Cf  
} (G:$/fK  
o <sX6a9e  
void CCaptureDlg::OnPaint() /z6NJ2jb  
{  y!!p:3  
 if (IsIconic()) Aj-}G^>#  
 { W*gu*H^s~  
  CPaintDC dc(this); // device context for painting [&6l=a  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); oMcX{v^"  
  // Center icon in client rectangle +,If|5>(  
  int cxIcon = GetSystemMetrics(SM_CXICON); }56"4/  Z  
  int cyIcon = GetSystemMetrics(SM_CYICON); f:e~ystm  
  CRect rect; !qT.D:!@zF  
  GetClientRect(&rect); <Cm:4)~  
  int x = (rect.Width() - cxIcon + 1) / 2; 6 :J @  
  int y = (rect.Height() - cyIcon + 1) / 2; jRzR`>5  
  // Draw the icon .BZw7 YV  
  dc.DrawIcon(x, y, m_hIcon); (1*?2u*j  
 } v@[MX- ,8  
 else Z{ &PKS  
 { ^BW V6  
  CDialog::OnPaint(); J7$5<  
 } RytQNwv3  
} qd"*Td  
P5kkaLzG  
HCURSOR CCaptureDlg::OnQueryDragIcon() db4Ol=  
{ B$aboL2  
 return (HCURSOR) m_hIcon;  !1;DRF  
} UEt #;e  
8&B{bS  
void CCaptureDlg::OnCancel() }Z"<KF  
{ ^2XoYgv  
 if(bTray) &H<-joZ)Z\  
  DeleteIcon(); ewD61Y8-  
  CDialog::OnCancel(); "C%;9_ig$  
} o^2.&e+dQ  
n~k;9`  
void CCaptureDlg::OnAbout() (yn!~El3  
{ L3'o2@$  
 CAboutDlg dlg; XV]`?  
 dlg.DoModal(); %.[t(F  
} |{<g-)  
q#F;GD  
void CCaptureDlg::OnBrowse() %mg |kb6n  
{ =D<46T=(RB  
 CString str; 1vu=2|QN  
 BROWSEINFO bi; UPA))Iv>  
 char name[MAX_PATH]; hI]KT a  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); =k'3rm*ld  
 bi.hwndOwner=GetSafeHwnd(); aV,>y"S  
 bi.pszDisplayName=name; c"v#d9  
 bi.lpszTitle="Select folder"; Kmk<  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ~"iCx+pr  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); (F +if  
 if(idl==NULL) % =br-c  
  return; &CG3_s<2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \ @3i=!  
 str.ReleaseBuffer(); +kmPQdO;*/  
 m_Path=str; x/R|i%u-s  
 if(str.GetAt(str.GetLength()-1)!='\\') l0 r Zril  
  m_Path+="\\"; {eMu"<  
 UpdateData(FALSE); >n{(2bcFs  
} r. =_=V/t  
lmgMR|v  
void CCaptureDlg::SaveBmp() T[*=7jnJQ  
{ X2/ `EN\  
 CDC dc; s+$l.aIO!  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); z{7&=$  
 CBitmap bm; *4dA(N\k"  
 int Width=GetSystemMetrics(SM_CXSCREEN); ~W_m<#K(  
 int Height=GetSystemMetrics(SM_CYSCREEN); #92 :h6  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 1ki##v[ W8  
 CDC tdc; 8J7 xs6@  
 tdc.CreateCompatibleDC(&dc); ; P&K a  
 CBitmap*pOld=tdc.SelectObject(&bm); W:ih#YW_F  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); %DbL|;z1  
 tdc.SelectObject(pOld); y!h$Z6.  
 BITMAP btm; g < M\zD  
 bm.GetBitmap(&btm); l!EfvqWX  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; )UO:J7K  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ==l p\  
 BITMAPINFOHEADER bih; YR=<xn;m.  
 bih.biBitCount=btm.bmBitsPixel; cL7je  
 bih.biClrImportant=0; p9y "0A|  
 bih.biClrUsed=0; {|O8)bW'  
 bih.biCompression=0; YO|Kc {j2e  
 bih.biHeight=btm.bmHeight; % Lhpj[C  
 bih.biPlanes=1; r*OSEzGUz  
 bih.biSize=sizeof(BITMAPINFOHEADER); r\.1=c#"bP  
 bih.biSizeImage=size; u yzc"d i  
 bih.biWidth=btm.bmWidth; 7AX<>^  
 bih.biXPelsPerMeter=0; /xWkP{  
 bih.biYPelsPerMeter=0; t:9}~%~  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); g~S>_~WL  
 static int filecount=0; eo24I0 `N  
 CString name; x~?,Wv|cm  
 name.Format("pict%04d.bmp",filecount++); &gw. &/t  
 name=m_Path+name; Eg FV  
 BITMAPFILEHEADER bfh; ;@Alr?y  
 bfh.bfReserved1=bfh.bfReserved2=0; p3M)gH=N  
 bfh.bfType=((WORD)('M'<< 8)|'B'); QS4sSua  
 bfh.bfSize=54+size; F<M#T  
 bfh.bfOffBits=54; +^iUY%pm  
 CFile bf; *!ZU" q}i  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 4/&Us  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ><mZOTn e;  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); TxoMCN?7c  
  bf.WriteHuge(lpData,size); .9#4qoM'  
  bf.Close(); )O#]Wvr  
  nCount++; 4L85~l  
 } mVcpYyD|k  
 GlobalFreePtr(lpData); 5wmH3g#0  
 if(nCount==1) S#8wnHq  
  m_Number.Format("%d picture captured.",nCount);  Xai ,  
 else CS)&A4`8  
  m_Number.Format("%d pictures captured.",nCount); /J aH  
  UpdateData(FALSE); #I'W[\l~+  
} `(vgBz`e[  
x }[/A;N  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) <UQaRI[55  
{ / V+&#N  
 if(pMsg -> message == WM_KEYDOWN) 7[rn ,8@  
 { UeIu -[R  
  if(pMsg -> wParam == VK_ESCAPE) >0k7#q}O  
   return TRUE; 7hZCh,O  
  if(pMsg -> wParam == VK_RETURN) 'ejuzE9  
   return TRUE; m\(4y Gj  
 } &^Zo}F2V  
 return CDialog::PreTranslateMessage(pMsg); D}XyT/8G3  
} E{[c8l2B  
mk2T   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f ?_YdVZ  
{ ^o+2:G5z}  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ zm-j FY?  
  SaveBmp(); 0(VH8@h`O  
  return FALSE; BC ]^BKP  
} A,ttn5Sh?  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ({zt=}r,  
 CMenu pop; 8xJdK'  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); MCD]n  
 CMenu*pMenu=pop.GetSubMenu(0); @>,3l;\Zh  
 pMenu->SetDefaultItem(ID_EXITICON); {a.{x+!5I-  
 CPoint pt; {+r pMUs#  
 GetCursorPos(&pt); rk*Igqf  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?7 e|gpQ|  
 if(id==ID_EXITICON) yH#zyO4fD-  
  DeleteIcon(); uc<XdFcu  
 else if(id==ID_EXIT)  VT96ph  
  OnCancel(); Q.7Rv XNw8  
 return FALSE; Tw/kD)u{  
} g dT3,8`#[  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); f50qA;7k  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) O&.^67\|  
 AddIcon(); oUIa/}}w5  
 return res; <"{Lv)4  
} aR6?+`6<  
O@{ JB  
void CCaptureDlg::AddIcon() BQ{Gp 2N  
{ TS^(<+'  
 NOTIFYICONDATA data; jz QmYcd  
 data.cbSize=sizeof(NOTIFYICONDATA); m3 C&QdjRp  
 CString tip; lEIX,amwa  
 tip.LoadString(IDS_ICONTIP); ](a*R  
 data.hIcon=GetIcon(0); #Z;ziM:  
 data.hWnd=GetSafeHwnd(); A8&yB;T$y  
 strcpy(data.szTip,tip); /tM<ois*  
 data.uCallbackMessage=IDM_SHELL; K++pH~o  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; $,otW2:)  
 data.uID=98; $6}siU7s4  
 Shell_NotifyIcon(NIM_ADD,&data); EGO;g^,  
 ShowWindow(SW_HIDE); }`&#{>]2  
 bTray=TRUE; UeV2`zIg`  
} hSSF]  
0kS[`a(}J  
void CCaptureDlg::DeleteIcon() W Y_}D!O  
{ XeX0\L')R  
 NOTIFYICONDATA data; I~H:-"2  
 data.cbSize=sizeof(NOTIFYICONDATA); BoYWx^VHx^  
 data.hWnd=GetSafeHwnd(); Q%KH^<  
 data.uID=98; ny%-u &1k  
 Shell_NotifyIcon(NIM_DELETE,&data);  7m_Jb5  
 ShowWindow(SW_SHOW); H$au02dpU  
 SetForegroundWindow(); ks< gSCB  
 ShowWindow(SW_SHOWNORMAL); Idop!b5!  
 bTray=FALSE; kD dY i7g>  
} 1,=U^W.G  
7D\#1h  
void CCaptureDlg::OnChange() Rcs7 'q5  
{ Izm8 qt=m  
 RegisterHotkey(); y?GRxoCD"e  
} {LYA?w^GT  
(2(I|O#  
BOOL CCaptureDlg::RegisterHotkey() \!j{&cJ  
{ S9d+#6rn  
 UpdateData(); gm~Ka%O|F  
 UCHAR mask=0; NX&mEz  
 UCHAR key=0; km,}7^?F0r  
 if(m_bControl) mV^+`GWvo  
  mask|=4; y5B4t6M(  
 if(m_bAlt) v/=O:SM}  
  mask|=2; jCqs^`-  
 if(m_bShift) _;3xG0+  
  mask|=1; "]>JtK  
  key=Key_Table[m_Key.GetCurSel()]; &MsnQP  
 if(bRegistered){ V^B'T]s  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); U4qp?g+:  
  bRegistered=FALSE; Z2~;u[0a[  
 } ,pE{N&p9  
 cMask=mask; Zm& X $U  
 cKey=key; <\eHK[_*  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ^]o]'  
 return bRegistered; !q=ej^(S  
} |0:< Z(  
jjL(=n<J<"  
  四、小结 +Rn]6}5m\  
,2q LiE>  
  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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