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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: Bx|W#:3e  
  T&pCLvkz  
  一、实现方法 =oL:|$Pj  
PL$XXj>|:  
  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: 8HBwcXYoHh  
^"?a)KC  
#pragma data_seg("shareddata") {q8|/{;  
HHOOK hHook =NULL; //钩子句柄 )?#K0o[<  
UINT nHookCount =0; //挂接的程序数目 @hg[v`~  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 N^[ F+y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 aQx6;PC  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey /Ls|'2J<$  
static int KeyCount =0; zu @|"f^`  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 zMP6hn  
#pragma data_seg() W1"NKg~4  
v {HF}L  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 CS~onf<xz  
=Vs?=|r  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: n8;L_43U  
xk>cdgt  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR dR\yRC]I  
cKey,UCHAR cMask) T]&?^QGAZ  
{ 8el6z2  
 BOOL bAdded=FALSE; E<3xv;v8r  
 for(int index=0;index<MAX_KEY;index++){ \HzmhQb+m  
  if(hCallWnd[index]==0){ xtv%C  
   hCallWnd[index]=hWnd; ' abEY  
   HotKey[index]=cKey; #?S"y:  
   HotKeyMask[index]=cMask; .cs x"JC  
   bAdded=TRUE; e Fz$h2*B  
   KeyCount++; 4_QfM}Fyp  
   break; C;JW \J~W  
  } #btf|\D  
 } %4!^AA%  
 return bAdded; #*CMf.OCh  
} 1 PdG1'  
//删除热键 +\_\53  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *Ts$Hj[  
{ QEt"T7a[/  
 BOOL bRemoved=FALSE; (jU_lsG  
 for(int index=0;index<MAX_KEY;index++){ UwS7B~  
  if(hCallWnd[index]==hWnd){ 18F}3t??  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ q9ra  
    hCallWnd[index]=NULL; 5"57F88Y1  
    HotKey[index]=0; =bD.5,F)  
    HotKeyMask[index]=0; ya~;Of5  
    bRemoved=TRUE; T=-UcF  
    KeyCount--; y-.{){uaD  
    break; M}11 tUl  
   } |A*4Fuc&  
  } Fw-Rv'\  
 } w"[T  
 return bRemoved; Ar >JQ@0  
} u=qK_$d4  
)m =xf1  
y$-@|M$GG  
  DLL中的钩子函数如下: y ]@JkF(  
I(R%j]LX&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) sNpA!!\PM  
{ 6}R*7iM s  
 BOOL bProcessed=FALSE; [UzacXt  
 if(HC_ACTION==nCode) B6IKD  
 { %p)&mYK{  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 -( p%+`  
   switch(wParam) HJg&fkHn1  
   {  |^5"-3Q  
    case VK_MENU: F5x*#/af  
     MaskBits&=~ALTBIT; C=&n1/  
     break; NYHK>u/5c  
    case VK_CONTROL: hq {{XQ  
     MaskBits&=~CTRLBIT; zL+t&P[\  
     break; B$2GEg]Ri  
    case VK_SHIFT: $-UVN0=  
     MaskBits&=~SHIFTBIT; m0^ "fMV  
     break; %(&ja_oO  
    default: //judge the key and send message H0"'jd  
     break; J'ce?_\?PY  
   } qZ[HILh!  
   for(int index=0;index<MAX_KEY;index++){ fTR6]i;  
    if(hCallWnd[index]==NULL) 6:%lxG  
     continue; tc`3-goX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4s:M}=]N  
    { *8,W$pe3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); B`R@%US  
     bProcessed=TRUE; MQw}R7  
    } %+Nng<_U\T  
   } |k}L=oWE  
  } e{87n>+,  
  else if((lParam&0xc000ffff)==1){ //有键按下 n;:.UGl9.  
   switch(wParam) |Y}YhUI&  
   { r@r*|50  
    case VK_MENU: <FBH;}]  
     MaskBits|=ALTBIT; Fl($0}ER  
     break; o[KZm17  
    case VK_CONTROL: QpQ2hNf  
     MaskBits|=CTRLBIT; ~xY"P)(x;  
     break; ZJWpb  
    case VK_SHIFT: &'k(v(>n,  
     MaskBits|=SHIFTBIT; cA 4?[F  
     break; WynTU?  
    default: //judge the key and send message .F@Lx45  
     break; u(1m#xr8$  
   } dDl+  
   for(int index=0;index<MAX_KEY;index++){ :35h0;8+  
    if(hCallWnd[index]==NULL) @a]cI  
     continue; IxUj(l1Fm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9Cd/SlNV2  
    { BQWg L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); n6Uh%rO7S|  
     bProcessed=TRUE; c3l(,5DtH  
    } fgL"\d}  
   } ,sc#l<v  
  } xV+\R/)x  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 WGA&Lr  
   for(int index=0;index<MAX_KEY;index++){ 46)[F0,$r  
    if(hCallWnd[index]==NULL) ?,riwDI 2  
     continue; ;0kAm Vy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /f?;,CyI  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #FAW@6QG  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 6P >Y2xV:  
   } \;'#8  
  } d!T,fz/-.  
 } 4$vUD1('  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); v7@"9Uw}  
} a"xRc  
3,G|oR{D  
  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: T7mT:z>:  
m[y~-n  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .{ILeG  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p#4*:rpq4  
|=:@<0.'  
  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: 'q;MhnU+  
ZhCz]z~tj6  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /cdLMm:  
{ mIG>`7`7N  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) um$U3'0e  
 { r]xN&Ne5Q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 N9d^;6;i  
  SaveBmp(); V+1c<LwT  
  return FALSE; r0k :RJP  
 } x1wD`r  
 …… //其它处理及默认处理 q7aqbkwz}  
} WLU_t65  
*^]  
3)>re&  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 X$u l=iBs  
y'2w*?  
  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。 "'``O~08/  
1r.2bL*~jw  
  二、编程步骤 lrHN6:x(Y4  
GNmP_N  
  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"; UK^w;w2F  
1S(oi  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; T;Kv<G;  
J_&cI%.  
  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; 7ZAxhFC  
tq}sedYhee  
  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; 6v:L8 t$"  
/o$6"~t  
  5、 添加代码,编译运行程序。 xG edY*[`  
!X"nN9k  
三、程序代码 ]5*H/8Ke7  
-ys/I,}<  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 6w3[PNd  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 3_;=y\F  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ P;y!Y/$C  
#if _MSC_VER > 1000 ^=-25%&^  
#pragma once n@kJ1ee'  
#endif // _MSC_VER > 1000 h){#dU+&  
#ifndef __AFXWIN_H__ `r=^{Y  
#error include 'stdafx.h' before including this file for PCH dmkGIg}  
#endif I31Nu{  
#include "resource.h" // main symbols "S{GjOlEDF  
class CHookApp : public CWinApp g1F9IB42@<  
{ Su,<idS  
 public: |,n(9Ix  
  CHookApp(); bSI*`Dc"!  
  // Overrides ueW/i  
  // ClassWizard generated virtual function overrides e]!`94f  
  //{{AFX_VIRTUAL(CHookApp)  wDiq~!  
 public: obbg# ,  
  virtual BOOL InitInstance(); SI6?b1;-:F  
  virtual int ExitInstance(); m|?1HCRXRI  
  //}}AFX_VIRTUAL h8M}}   
  //{{AFX_MSG(CHookApp) 4>Ht_B<<  
  // NOTE - the ClassWizard will add and remove member functions here. !F6rcDKI  
  // DO NOT EDIT what you see in these blocks of generated code ! H 9/m6F  
  //}}AFX_MSG er 1zSTkg  
  DECLARE_MESSAGE_MAP() "\9 beK:l  
}; 1 5|gG<-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); "3 2Ua3m:G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); WQw11uMt@q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3\ )bg R:  
BOOL InitHotkey(); It3@ Cd>  
BOOL UnInit(); d\A7}_r*x  
#endif 8EiS\$O-  
pkG8g5(w  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. BB1_EdoG  
#include "stdafx.h" 0V"(}!=2a  
#include "hook.h" IwbV+mWQ  
#include <windowsx.h> 33}p02#  
#ifdef _DEBUG 2}P{7flDY  
#define new DEBUG_NEW ~|{e"!(}  
#undef THIS_FILE g p|G q  
static char THIS_FILE[] = __FILE__; 9XS>;<"2  
#endif b4KNIP7E  
#define MAX_KEY 100 9ygNJX'~  
#define CTRLBIT 0x04 /NPx9cLW^  
#define ALTBIT 0x02 fWg 3gRI  
#define SHIFTBIT 0x01 7S= ]@*  
#pragma data_seg("shareddata") vsA/iH.  
HHOOK hHook =NULL; Q}lY1LT`  
UINT nHookCount =0; d"ZsOq10D  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ,HE{&p2y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT DeN2P  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey '|tmmoY6a:  
static int KeyCount =0; Frx_aGLH1  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 8&x&Ou$("V  
#pragma data_seg() /^~)iTwH  
HINSTANCE hins; - t 4F  
void VerifyWindow(); \dB z-H'@  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) }ew )QHd  
//{{AFX_MSG_MAP(CHookApp) ,*L3  
// NOTE - the ClassWizard will add and remove mapping macros here. b83m'`vRM  
// DO NOT EDIT what you see in these blocks of generated code! 9j;!4AJ1t  
//}}AFX_MSG_MAP 4 ;6,h6a  
END_MESSAGE_MAP() X"f]  
vvG*DGL)qL  
CHookApp::CHookApp() Kx;la  
{ SrMfd7H8f  
 // TODO: add construction code here, X*)DpbWd  
 // Place all significant initialization in InitInstance L`w_Q2{sv  
} Oeg^%Y   
.nA9irc  
CHookApp theApp; PGTjOkx  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) .q 4FGPWz  
{ =':SOO7  
 BOOL bProcessed=FALSE; j->5%y  
 if(HC_ACTION==nCode) 2R3)/bz-SV  
 { -ebyW#  
  if((lParam&0xc0000000)==0xc0000000){// Key up j3?@p5E(  
   switch(wParam) T!&VT;   
   { PC,I"l  
    case VK_MENU: 1NN#-U  
     MaskBits&=~ALTBIT; oBPm^ob4  
     break; >T14 J'\  
    case VK_CONTROL: y?*Y=,"  
     MaskBits&=~CTRLBIT; '2p,0Bk9i  
     break; p{0rHu[  
    case VK_SHIFT: "GxQ9=Z  
     MaskBits&=~SHIFTBIT; 0)vX  
     break; 6D4u?P,  
    default: //judge the key and send message -OgC.6  
     break; ?O#"x{Pk  
   } Jd|E 4h~(  
   for(int index=0;index<MAX_KEY;index++){ 9PR?'X;4  
    if(hCallWnd[index]==NULL) '_n$xfH  
     continue; 0e'@Xo2e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k <LFH(  
    { 7X/B9Hee  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); x)kp*^/  
     bProcessed=TRUE; Z7MGBwP(  
    } sdQ "[`~2R  
   } :{#w-oC>6P  
  } 9$R}GK  
  else if((lParam&0xc000ffff)==1){ //Key down )*BG-nM u  
   switch(wParam) jpiBHi]5+  
   { CY@#_z  
    case VK_MENU: Q\le3KB  
     MaskBits|=ALTBIT; #.@D}7y5  
     break; kbx4I?  
    case VK_CONTROL: .Ax]SNZ+:A  
     MaskBits|=CTRLBIT; FCt %of#  
     break; EHq?yj;  
    case VK_SHIFT: |s !7U  
     MaskBits|=SHIFTBIT; W_]onq 6  
     break; \q|<\~A  
    default: //judge the key and send message {k<mN Y  
     break; /yO0Z1G  
   } H$3:Ra+ S  
   for(int index=0;index<MAX_KEY;index++) 7Rr +Uzb(  
   { jxgs!B>   
    if(hCallWnd[index]==NULL) ?$H=n{iW  
     continue; $viZ[Lu!m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) yzL6oU-{&  
    { 3gs7Xj%N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Gl>*e|}  
     bProcessed=TRUE; JjH141 n%D  
    } &UX:KW`=  
   } Vfr.Yoy  
  } ]RI+:f  
  if(!bProcessed){ mv`ND&  
   for(int index=0;index<MAX_KEY;index++){ /Nd`eUn  
    if(hCallWnd[index]==NULL) JHsxaX;c  
     continue; 5k<0>6;XH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pJ@D}2u(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Cl!qdh6  
   } |)YN"nqg  
  } z dUSmb  
 } ff 2`4_ ,|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); U;Q?Rh- W  
} Z2I2 [pA  
G9 ra;.  
BOOL InitHotkey() ?Lquf&`vP  
{ `mDCX  
 if(hHook!=NULL){ 4Mv]z^  
  nHookCount++; hyC]{E  
  return TRUE; rIAbr5CG  
 } ks(BS k4  
 else 1xb1?/n1#  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); X:OUu;  
  if(hHook!=NULL) .QM>^(o$Z  
   nHookCount++; }m.45n/  
  return (hHook!=NULL); ~:"//%M3l  
} KyRcZ"  
BOOL UnInit() 9h0Y">}`b  
{ Au{J/G<W@  
 if(nHookCount>1){ 0-I L@Di`F  
  nHookCount--; =a_ >")  
  return TRUE; %2`.*]L  
 } o+FDkqEN  
 BOOL unhooked = UnhookWindowsHookEx(hHook); WKONK;U+7  
 if(unhooked==TRUE){ F+m;y  
  nHookCount=0; -h,?_d>  
  hHook=NULL; e6I7N?j  
 } !TPKD  
 return unhooked; U~Rs?JmTdD  
} 2$yNryd  
%v<BE tq  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) y3@5~4+  
{ _ v3VUm#  
 BOOL bAdded=FALSE; C\gKJW^]y@  
 for(int index=0;index<MAX_KEY;index++){ ;^|:*  
  if(hCallWnd[index]==0){ 2X@"#wIg  
   hCallWnd[index]=hWnd; Hie  
   HotKey[index]=cKey; ?!$:I8T  
   HotKeyMask[index]=cMask; Ws:MbZyr  
   bAdded=TRUE; EVDcj,b"^  
   KeyCount++; V%[34G  
   break; cPPTGpqw  
  } %HcCe[d5l  
 } A$W~R  
 return bAdded; "<yJ<lS&>  
} klx28/]  
P?j;&@$^e  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) YaAOP'p  
{ Ew*SA  
 BOOL bRemoved=FALSE; irKM?#h  
 for(int index=0;index<MAX_KEY;index++){ 9qX)FB@'i;  
  if(hCallWnd[index]==hWnd){ XWq@47FR  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ j4}Q  
    hCallWnd[index]=NULL; F0/!+ho  
    HotKey[index]=0; T3h1eU  
    HotKeyMask[index]=0; *w[0uQL5Z  
    bRemoved=TRUE; `clp#l.ii  
    KeyCount--; K5}0!_)G  
    break; @ x5LrQ_`r  
   } O#x=iZI  
  } OzUo}QN  
 } D7v_ <  
 return bRemoved; aQglA  
} s-JS[  
lHc9D  
void VerifyWindow() yUEvva  
{ !p{CsR8c  
 for(int i=0;i<MAX_KEY;i++){ ;_p!20.(  
  if(hCallWnd!=NULL){ 2[g kDZ  
   if(!IsWindow(hCallWnd)){ f}w_]l#[G  
    hCallWnd=NULL; K aNO&%qX  
    HotKey=0; @k-iy-|3 )  
    HotKeyMask=0;  a S ,  
    KeyCount--; 7,5Bur  
   } CRPE:7,D  
  } 9i+`,r  
 } >IJX=24Rc  
} _~O*V&  
kxt/I<cs  
BOOL CHookApp::InitInstance() c]R27r E  
{  N}KL'  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^JAp#?N^9  
 hins=AfxGetInstanceHandle(); 8QQh1q2  
 InitHotkey(); nt$q< 57  
 return CWinApp::InitInstance(); !uqp?L^;  
} %'.3t|zH  
zQaD&2 q  
int CHookApp::ExitInstance() C{OkbE"Vym  
{ s%^@@Dk  
 VerifyWindow(); e@7UL|12  
 UnInit(); du_~P"[  
 return CWinApp::ExitInstance(); '+7"dHLC;  
} Ih)4.lLcKn  
z8cefD9F  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 40}7O<9*  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) [I`:%y  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ -9(pOwN |m  
#if _MSC_VER > 1000 ]Wtg.y6;  
#pragma once I %|;M%B  
#endif // _MSC_VER > 1000 in`|.#  
cc0T b  
class CCaptureDlg : public CDialog 'PWA  
{ @S1Z "%S  
 // Construction Ty}Y/jW  
 public: 'zOB!QqA`v  
  BOOL bTray; HYl~)O>  
  BOOL bRegistered; 4`Lr^q}M+  
  BOOL RegisterHotkey(); ZP '0=  
  UCHAR cKey; 2 ])e}& i  
  UCHAR cMask; Sm;@MI<@/  
  void DeleteIcon(); 8^sh@j2L  
  void AddIcon(); 17-B'Gl!<%  
  UINT nCount; ; *\xdg{d  
  void SaveBmp(); 2d&]V]:R*  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor fNz(z\  
  // Dialog Data -^q;e]+J  
  //{{AFX_DATA(CCaptureDlg) gFl@A}  
  enum { IDD = IDD_CAPTURE_DIALOG }; (C0Wty  
  CComboBox m_Key; Z{x)v5yh2V  
  BOOL m_bControl; m"!Q5[  
  BOOL m_bAlt; c2-oFLNP=  
  BOOL m_bShift; OAf}\  
  CString m_Path; [ps4i_  
  CString m_Number; 1)!2D?w  
  //}}AFX_DATA ik1asj1  
  // ClassWizard generated virtual function overrides k~)@D| ?  
  //{{AFX_VIRTUAL(CCaptureDlg) jXPbj.  
 public: L8(2or  
  virtual BOOL PreTranslateMessage(MSG* pMsg); TG% w  
 protected: 9 !$&1|,*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~BMUea(  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 8.Ufw. 5  
  //}}AFX_VIRTUAL AG><5 }  
  // Implementation t1wzSG  
 protected: 5= T$h;O  
  HICON m_hIcon; ),Hr  
  // Generated message map functions 3^5h:OaT  
  //{{AFX_MSG(CCaptureDlg) pog   
  virtual BOOL OnInitDialog(); NS-0-o|4#  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); o2[$X ONTl  
  afx_msg void OnPaint(); 8:[ l1d86  
  afx_msg HCURSOR OnQueryDragIcon(); |K9*><P?)2  
  virtual void OnCancel(); 9sI&d  
  afx_msg void OnAbout(); Vh>|F}%E  
  afx_msg void OnBrowse(); kW0ctGFYlf  
  afx_msg void OnChange(); YQb503W"d~  
 //}}AFX_MSG bOSqD[?  
 DECLARE_MESSAGE_MAP() ubRhJ~XB  
}; (2UA,  
#endif }B_?7+  
_D$1CaAYo  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file +;4;~>Y  
#include "stdafx.h" QAAuFZs  
#include "Capture.h" hu.p;A3p;  
#include "CaptureDlg.h" g#`}HuPoE  
#include <windowsx.h> e4|a^lS;  
#pragma comment(lib,"hook.lib") &XCP@@T  
#ifdef _DEBUG R+z'6&/ =I  
#define new DEBUG_NEW Kp^"<%RT  
#undef THIS_FILE 5h|aX  
static char THIS_FILE[] = __FILE__; ;" Aj80  
#endif #<X4RJ  
#define IDM_SHELL WM_USER+1 'T$Cw\F&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T?RN} @D  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -xbs'[  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; rT\~VJ>+i  
class CAboutDlg : public CDialog mE_%  
{ h=\1ZQKC)  
 public: I L,lXB<  
  CAboutDlg(); (:F]@vT  
  // Dialog Data +r7hc;+G  
  //{{AFX_DATA(CAboutDlg) ]=9 d'WL  
  enum { IDD = IDD_ABOUTBOX }; {]dG 9  
  //}}AFX_DATA oUO3,2bn  
  // ClassWizard generated virtual function overrides J% n#uUs  
  //{{AFX_VIRTUAL(CAboutDlg) l fF RqZ  
 protected: @,7r<6E  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support EV-sEl8ki  
  //}}AFX_VIRTUAL _>BYUPY  
  // Implementation bDudETl  
 protected: hnH<m7  
  //{{AFX_MSG(CAboutDlg) }a#T\6rY  
  //}}AFX_MSG ||fw!8E  
  DECLARE_MESSAGE_MAP() yYSmmgrX0  
}; ^M%P43  
?PqkC&o[q  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ZjY,k  
{ ("F$r$9S  
 //{{AFX_DATA_INIT(CAboutDlg) -2!S>P Zs  
 //}}AFX_DATA_INIT :J_UXtx  
} #Hz9@H  
zA}JVB  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) v*0J6<  
{ d2V\T+=  
 CDialog::DoDataExchange(pDX); A+GRTwj  
 //{{AFX_DATA_MAP(CAboutDlg) > ;#Y0  
 //}}AFX_DATA_MAP b8Z_o N5!  
} S(nQ?;9,  
63J3NwFt  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) >F:1a\c  
 //{{AFX_MSG_MAP(CAboutDlg) R)ZzRz|/  
 // No message handlers mj'N)6ga  
 //}}AFX_MSG_MAP 0|J9Btbp  
END_MESSAGE_MAP() !L|l(<C  
e$_gOwB  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +nHr+7}  
: CDialog(CCaptureDlg::IDD, pParent) B8?9L8M}  
{ ah f,- ?S  
 //{{AFX_DATA_INIT(CCaptureDlg) kZo# Ny  
  m_bControl = FALSE; w\ 0vP  
  m_bAlt = FALSE; +H?g9v40  
  m_bShift = FALSE; H C,5j)1  
  m_Path = _T("c:\\"); 1h(IrV5g  
  m_Number = _T("0 picture captured."); oV;sd5'LG  
  nCount=0; j`q>YPp  
  bRegistered=FALSE; \At~94  
  bTray=FALSE; .ahY 1CO  
 //}}AFX_DATA_INIT >N2kWSa  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ^;h\#S[%  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); #pgD-0_  
} .P7q)lj36h  
' `c \Dq  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) f3qR7%X?  
{ Er|&4-9  
 CDialog::DoDataExchange(pDX); 04&S.#+(  
 //{{AFX_DATA_MAP(CCaptureDlg) 2O@ON/  
  DDX_Control(pDX, IDC_KEY, m_Key); I4+1P1z  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); `?.6}*4@_A  
  DDX_Check(pDX, IDC_ALT, m_bAlt); O`1!&XT{x  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 5._QI/d)'J  
  DDX_Text(pDX, IDC_PATH, m_Path); 7O k-T10  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 0TA8#c  
 //}}AFX_DATA_MAP 0^Vw^]w  
} $[ S 33Q  
h.]^o*DJ  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) SmD#hE[  
//{{AFX_MSG_MAP(CCaptureDlg) u{&=$[;  
 ON_WM_SYSCOMMAND() 7P}l^WX  
 ON_WM_PAINT() J k`Jv;  
 ON_WM_QUERYDRAGICON() @%2crJnkS  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) F):kF_ho  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) @BjB Mi,  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 9eq)WI/  
//}}AFX_MSG_MAP +X+R8  
END_MESSAGE_MAP() :h(3Ep  
B Tj1C  
BOOL CCaptureDlg::OnInitDialog() H_3Wx fO  
{ W`JI/  
 CDialog::OnInitDialog(); /DH`7E  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); OmZZTeGg1s  
 ASSERT(IDM_ABOUTBOX < 0xF000); iG"v  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .sQV0jF{  
 if (pSysMenu != NULL) !`7evV:  
 { x1`(Z|RJ  
  CString strAboutMenu; o6|- :u5_/  
  strAboutMenu.LoadString(IDS_ABOUTBOX); lH`c&LL-=!  
  if (!strAboutMenu.IsEmpty()) "Dk@-Ac  
  { ^Ss <<  
   pSysMenu->AppendMenu(MF_SEPARATOR); jg'"?KSU~  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); f. >[ J  
  } T"3LO[j+  
 } bv(+$YR  
 SetIcon(m_hIcon, TRUE); // Set big icon E&z^E2  
 SetIcon(m_hIcon, FALSE); // Set small icon FZ<6kk4  
 m_Key.SetCurSel(0); ib 'l:GM  
 RegisterHotkey(); 2-qWR<E  
 CMenu* pMenu=GetSystemMenu(FALSE); v(JjvN21  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); *y|w9 r p  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); c)N_"#&  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ZVJ6 {DS/  
 return TRUE; // return TRUE unless you set the focus to a control "QS(4yw?jg  
} 9}2/ko  
3AR'Zvn  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Gw-{`<CxE  
{ )BI%cD  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) tC$+;_=+F  
 { j|o/>^ 'e  
  CAboutDlg dlgAbout; ? eI)m  
  dlgAbout.DoModal(); n} !')r  
 } /Us+>vg!  
 else dc~vQDNw[X  
 { K%BFR,)g  
  CDialog::OnSysCommand(nID, lParam); ^/Yk*Ny  
 } :N^B54o%6  
} -{JReplc  
K iXD1Zpz  
void CCaptureDlg::OnPaint() _C1u}1hW#  
{ ]Hi1^Y<  
 if (IsIconic()) Q2]7|C  
 { "30=!k  
  CPaintDC dc(this); // device context for painting U v>^ Z2  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ! @Vj&>mH$  
  // Center icon in client rectangle w^HI lA  
  int cxIcon = GetSystemMetrics(SM_CXICON); `WC4:8  
  int cyIcon = GetSystemMetrics(SM_CYICON); bT9:9LP  
  CRect rect; rO#$SW$YW  
  GetClientRect(&rect); y|*4XF<b  
  int x = (rect.Width() - cxIcon + 1) / 2; y,Bj,zw  
  int y = (rect.Height() - cyIcon + 1) / 2; 9"1=um=  
  // Draw the icon #z.\pd  
  dc.DrawIcon(x, y, m_hIcon); #=Xa(<t  
 } ujX\^c  
 else >b3IZ^SB#$  
 { >dF #1  
  CDialog::OnPaint(); {i3x\|  
 } OEbZs-:  
} t VX|e2Y  
n31nORx50  
HCURSOR CCaptureDlg::OnQueryDragIcon() X%iqve"{nB  
{ wT;;B=u}G  
 return (HCURSOR) m_hIcon; ]k1N-/  
} d3T7$'l$  
o!y<:CGL  
void CCaptureDlg::OnCancel() AlrUfSBB  
{ T}XJFV  
 if(bTray) 6OPNP0@r  
  DeleteIcon(); }c4F}Cy  
  CDialog::OnCancel(); uF|[MWcy0#  
} +U<Ae^V  
S*3$1BTl  
void CCaptureDlg::OnAbout() 7|"G 3ck  
{ aa!1w93?i  
 CAboutDlg dlg; JL:B4 f%}B  
 dlg.DoModal(); {EU]\Mp0j  
} ;yZY2)L   
Pff-eT+~m  
void CCaptureDlg::OnBrowse() Ja\B%f  
{ .fhfO @  
 CString str; +`m0i1uI3  
 BROWSEINFO bi; aM8z_j!!u  
 char name[MAX_PATH]; /~<Przw  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); MD>E0p)  
 bi.hwndOwner=GetSafeHwnd(); waV4~BdL  
 bi.pszDisplayName=name; }zeKf/?'  
 bi.lpszTitle="Select folder"; f'S0 "  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; #]}G{ P  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); X)9|ZF2`  
 if(idl==NULL) o+<hI  
  return; 4=* ml}RP  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :NH '>'  
 str.ReleaseBuffer(); 3i}$ ~rz]U  
 m_Path=str; _1$+S0G;  
 if(str.GetAt(str.GetLength()-1)!='\\') 'xM\txZ;  
  m_Path+="\\"; yAel4b/}  
 UpdateData(FALSE); 1&kf2\S  
} tE=$#  
!:g\Fe]  
void CCaptureDlg::SaveBmp() 1tpt433  
{ c/3]M>+M  
 CDC dc; @(tuE  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); <("P5@cExU  
 CBitmap bm; 3URrK[%x`  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6XeqK*r*  
 int Height=GetSystemMetrics(SM_CYSCREEN); O} lqY?0*  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ,}Ic($ To  
 CDC tdc; AlgVsE%Va  
 tdc.CreateCompatibleDC(&dc); VD=F{|^  
 CBitmap*pOld=tdc.SelectObject(&bm); n6INI~,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); jLul:* L  
 tdc.SelectObject(pOld); u/?;J1z:  
 BITMAP btm; P(zquKm  
 bm.GetBitmap(&btm); B"RZpx  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; rf&nTDaWI  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 90$`AMR  
 BITMAPINFOHEADER bih; X^ 0jS  
 bih.biBitCount=btm.bmBitsPixel; G{|F V m  
 bih.biClrImportant=0; L w/ZKXDU2  
 bih.biClrUsed=0; MS%h`Ypo  
 bih.biCompression=0; 8ax3"G  
 bih.biHeight=btm.bmHeight; 'DH_ihZ  
 bih.biPlanes=1; nZS*"O#L  
 bih.biSize=sizeof(BITMAPINFOHEADER); g[xn0 rG  
 bih.biSizeImage=size; y {Mh ?H  
 bih.biWidth=btm.bmWidth; $4TawFf"nc  
 bih.biXPelsPerMeter=0; 2 BwpxV8  
 bih.biYPelsPerMeter=0; v|>'m#Ln2  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @j4~`~8  
 static int filecount=0; eJ$ {`&J  
 CString name; B;L^!sLP  
 name.Format("pict%04d.bmp",filecount++); U C9w T  
 name=m_Path+name; HR k^KB  
 BITMAPFILEHEADER bfh; /#?i+z   
 bfh.bfReserved1=bfh.bfReserved2=0; C? b_E  
 bfh.bfType=((WORD)('M'<< 8)|'B'); g\,HiKBXd  
 bfh.bfSize=54+size; \3z^/F~  
 bfh.bfOffBits=54; Hn(L0#Oqy  
 CFile bf; %G~%:uJ5  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =CO#Q$  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); "[ ]72PC  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); af7\2 g3*  
  bf.WriteHuge(lpData,size); TWQ{, B  
  bf.Close(); >E(IkpZ  
  nCount++; B3Esfk  
 } P1QGfp0-J  
 GlobalFreePtr(lpData); UBy:W^\g  
 if(nCount==1) iW <B1'dp  
  m_Number.Format("%d picture captured.",nCount); YPav5<{a  
 else P}Ule|&LK  
  m_Number.Format("%d pictures captured.",nCount); 5 %aT  
  UpdateData(FALSE); R:DW>LB  
} j6)@kW9x  
V0 OT_F  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) jvos)$;L-  
{ utwqP~  
 if(pMsg -> message == WM_KEYDOWN) 9Fxz9_ i  
 { NvlG@^&S  
  if(pMsg -> wParam == VK_ESCAPE) Wj. _{  
   return TRUE; ~x}=lKN  
  if(pMsg -> wParam == VK_RETURN) .:s**UiDR  
   return TRUE; 8/E?3a_g-  
 } Fop "m/  
 return CDialog::PreTranslateMessage(pMsg); uBC*7Mkm  
} :j,e0#+sA  
)<jT;cT!&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <El6?ml@  
{ +hS}msu'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ TXQ Y&7  
  SaveBmp(); Kth^WHL  
  return FALSE; x:Kca3pv_  
} enT.9|vm/  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ "eal Yveu  
 CMenu pop; P/FO,S-V  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #fYz367>  
 CMenu*pMenu=pop.GetSubMenu(0); bKH8/*Yk  
 pMenu->SetDefaultItem(ID_EXITICON); F/w!4,'<?5  
 CPoint pt; cB7=4:U  
 GetCursorPos(&pt); G P/3r[MH  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 7nHlDPps)  
 if(id==ID_EXITICON) "VcG3.  
  DeleteIcon(); 5 lC"10  
 else if(id==ID_EXIT) GVp2| \-L  
  OnCancel(); 8V3SZ17  
 return FALSE; K]q OLtc  
} O<h`[1eUjS  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ;dYpdy  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE)  p68) 0  
 AddIcon(); n2H2G_-L[  
 return res; ? <slB>8  
} e&u HU8k*  
%+9Mr ami  
void CCaptureDlg::AddIcon() 2FS,B\d  
{ G}\E{VvWh  
 NOTIFYICONDATA data; l$Y7CIH  
 data.cbSize=sizeof(NOTIFYICONDATA); %-:6#b z  
 CString tip; l>M&S^/s j  
 tip.LoadString(IDS_ICONTIP); /Et:',D  
 data.hIcon=GetIcon(0); T{j&w%(z  
 data.hWnd=GetSafeHwnd(); _>*$%R  
 strcpy(data.szTip,tip); A_@#V)D2  
 data.uCallbackMessage=IDM_SHELL; LE!3'^Zq  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; E-i rB/0  
 data.uID=98; I=pT fkTT  
 Shell_NotifyIcon(NIM_ADD,&data); {j E}mzi  
 ShowWindow(SW_HIDE); B;':Eaa@  
 bTray=TRUE; ^YKEc0"w(  
} }45&s9m=  
([ xYOxcp5  
void CCaptureDlg::DeleteIcon() Qp${/  
{ sEL[d2oO  
 NOTIFYICONDATA data; W$P)fPU'  
 data.cbSize=sizeof(NOTIFYICONDATA); @&d/}Mx"t  
 data.hWnd=GetSafeHwnd(); Jh[fFg]  
 data.uID=98; yHhBUpIo  
 Shell_NotifyIcon(NIM_DELETE,&data); |k+Y >I&  
 ShowWindow(SW_SHOW); [N925?--S  
 SetForegroundWindow(); 6kKIDEX  
 ShowWindow(SW_SHOWNORMAL); X4Eq/q"  
 bTray=FALSE; 4>>d "<}C  
}  >kK  
e ?H`p"l  
void CCaptureDlg::OnChange() w.Ft-RXA W  
{ 6P!M+PO  
 RegisterHotkey(); mg*[,_3q33  
} z.pP~he  
\ey3i((L  
BOOL CCaptureDlg::RegisterHotkey() t*^Q`V wQ  
{ +B%ZB9  
 UpdateData(); ;e_n7>'#%  
 UCHAR mask=0; ^'C1VQ%  
 UCHAR key=0; ; eq^m,oz  
 if(m_bControl) )}7rM6hv  
  mask|=4; >e"CpbZ'  
 if(m_bAlt) Wgdij11e  
  mask|=2; j#0@%d  
 if(m_bShift) &B7X LO[  
  mask|=1; q?{wRBVVB  
  key=Key_Table[m_Key.GetCurSel()]; 0\Qqv7>  
 if(bRegistered){ Je+z\eT!5<  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); !5Kv9P79  
  bRegistered=FALSE; pl V]hu27K  
 } +dk}$w[ g  
 cMask=mask; *9((b;Ju  
 cKey=key; Yyby 1  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); W[: n*h  
 return bRegistered; {KE858  
} 3j(GcR 9  
z6b!,lp  
  四、小结 N%:QaCZKw  
SV}I+O_w  
  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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