社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 7874阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 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: L 42|>%uo  
  .Gizz</P~  
  一、实现方法 {~"7vkc+  
{r={#mO;p  
  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: E@w[&#  
'h-3V8m^e  
#pragma data_seg("shareddata") J=UZ){c>:.  
HHOOK hHook =NULL; //钩子句柄 Bx(yu'g|a  
UINT nHookCount =0; //挂接的程序数目 ! FNf>z+  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 5x8'K7/4.  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1  YywEZ?X  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ],8;eq%W)  
static int KeyCount =0; `gBD_0<T7  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 _QR g7  
#pragma data_seg() iQt!PMF.  
b5A Gk  
  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。 F:%^&%\  
&*B>P>x  
  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: izCaB~{/  
'#v71,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR m CM|&u  
cKey,UCHAR cMask) #gh p/YoTq  
{ l8z%\p5cR  
 BOOL bAdded=FALSE; _6;<ow  
 for(int index=0;index<MAX_KEY;index++){ *B0V<mV  
  if(hCallWnd[index]==0){ ZjqA30!  
   hCallWnd[index]=hWnd; NuU'0_")/  
   HotKey[index]=cKey; _u> t3RUA  
   HotKeyMask[index]=cMask; h4f ~5- Y  
   bAdded=TRUE; ZP"yq6!i  
   KeyCount++; ezp<@'0ZT  
   break; !#q{Z>H`  
  } 6wPeb~{  
 } FbveI4  
 return bAdded; /H')~!Yz  
} '/k^C9~m r  
//删除热键 Bg-VCJI<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #c-b}.R  
{ ?^|QiuU:n  
 BOOL bRemoved=FALSE; LI[ ?~P2\  
 for(int index=0;index<MAX_KEY;index++){ tqK=\{U  
  if(hCallWnd[index]==hWnd){ D9~}5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ OCCEL9d  
    hCallWnd[index]=NULL; sf`PV}a1  
    HotKey[index]=0; ;4 ,'y  
    HotKeyMask[index]=0; tWm>j  
    bRemoved=TRUE; huz86CO  
    KeyCount--; T?>E{1pS  
    break; ! ,@ZQS  
   } UxyY<H~Wx  
  } {VR`;  
 } ( : {"C6x  
 return bRemoved; F) ?o,  
} <yZP|_  
2B^~/T<\  
R*087X7 N|  
  DLL中的钩子函数如下: u+i(";\  
lX"bN=E?!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) V] rhVMA  
{ ;1v=||V  
 BOOL bProcessed=FALSE; NCi>S%pD`<  
 if(HC_ACTION==nCode) _?.\Xc  
 { Pey//U  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ]u+MTW;  
   switch(wParam) m4@MxQm  
   {  y0<U u  
    case VK_MENU: I:i<>kG  
     MaskBits&=~ALTBIT; tRteyNA  
     break; e&0NK8&#+  
    case VK_CONTROL: `m%:rE,  
     MaskBits&=~CTRLBIT; =+<d1W`>0  
     break; u, eZ6  
    case VK_SHIFT: #4><r.v3  
     MaskBits&=~SHIFTBIT; V5AW&kfd  
     break; \^&   
    default: //judge the key and send message Z'Q*L?E8M  
     break; %*kLEA*v  
   } c` , 2h#  
   for(int index=0;index<MAX_KEY;index++){ FI8k;4|V  
    if(hCallWnd[index]==NULL) }p=g*Zo*C;  
     continue; MAnp{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Q[uAIyv0  
    { 77*qkKr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); If;R?j0;Q  
     bProcessed=TRUE; 4O(@'#LLz  
    } 7S<UFj   
   } X D)  8?  
  } Ra[>P _  
  else if((lParam&0xc000ffff)==1){ //有键按下 dx@QWTNE  
   switch(wParam) M;KA]fmc  
   { rgqQxe=  
    case VK_MENU: 94Ud@F9d5  
     MaskBits|=ALTBIT; H8f]}  
     break; 78 d_io}w  
    case VK_CONTROL: ^O)ve^P  
     MaskBits|=CTRLBIT; J B^Q\;$  
     break; ^P?vkO"pB?  
    case VK_SHIFT: WS:5MI,OL  
     MaskBits|=SHIFTBIT; W`rMtzL5  
     break; ^,TTwLy- t  
    default: //judge the key and send message R-  
     break; <'+ %\  
   } +{$QAjW(/  
   for(int index=0;index<MAX_KEY;index++){ B76 v}O:  
    if(hCallWnd[index]==NULL) vX;HC'%n  
     continue; .'1SZe7O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /ZW&0 E  
    { , ECLqs%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); a }'->H  
     bProcessed=TRUE; (e9fm|n!)|  
    } ybQP E/9  
   } 8:thWGLN  
  } /syVGmS'M  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 D. Kqc  
   for(int index=0;index<MAX_KEY;index++){ 6;+jIkkD)  
    if(hCallWnd[index]==NULL) 5wT>N46UX  
     continue; }mZV L~|V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) d"ZU y!a  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  )\ZzTS  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 7?nJ4x1  
   } dlDki.  
  } ufrqsv]=  
 } >$H|:{D  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); `#Kx|x6  
} +7U  
nX^1$')gp  
  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: l?8)6z#Zl  
~e">_;k6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +th%enRB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }gGkV]  
A\AT0th  
  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: xx)-d,S  
pBp #a  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?D|\]0eN  
{ k6(r !mc  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) h2w}wsb0l  
 { |c2 xy  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 <G ~>~L.E  
  SaveBmp(); $bsH$N#6T  
  return FALSE; S1J<9xqSQ8  
 } 347eis'  
 …… //其它处理及默认处理 y'} O)lO1  
} p $ouh  
yz\c5  
y(a!YicA?  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 eV7 u*d?  
~AZWds(,N  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 nfdq y)  
` ;)ZGY\  
  二、编程步骤 8)yI<`q6  
5$rSEVg9  
  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"; h}L}[   
L]d-33.c!H  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; EQ<RDhC@b  
nSx]QREL!  
  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; j1-,Sqi  
r$(~j^<s  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; DmqSQA  
. +  
  5、 添加代码,编译运行程序。 "TS  
H'=(`  
三、程序代码 +jP~s  
WYrI|^[>  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 6#e::GD  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) YB,t0%vTJw  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Sw[{JB;y,  
#if _MSC_VER > 1000 ,Hn^z<f   
#pragma once OGO ~f;7  
#endif // _MSC_VER > 1000 d s:->+o  
#ifndef __AFXWIN_H__ 9GLb"6+PK  
#error include 'stdafx.h' before including this file for PCH 7KjUW\mN2Z  
#endif hBU\'.x  
#include "resource.h" // main symbols > \Sr{p5KR  
class CHookApp : public CWinApp k`{7}zxS  
{ +q<B.XxkA  
 public: !CUoHTmB  
  CHookApp(); TsQU6NNE  
  // Overrides nV_8Ke  
  // ClassWizard generated virtual function overrides d3;qsUh$yv  
  //{{AFX_VIRTUAL(CHookApp) V5`^Y=X(%  
 public: &M />tE Z)  
  virtual BOOL InitInstance(); M@Q3M(z  
  virtual int ExitInstance(); Vz=auM1xZ  
  //}}AFX_VIRTUAL eH%RNtP`  
  //{{AFX_MSG(CHookApp) TX [%(ft  
  // NOTE - the ClassWizard will add and remove member functions here. #z'uRHx%=0  
  // DO NOT EDIT what you see in these blocks of generated code ! S9| a$3K'  
  //}}AFX_MSG 6Jz^  
  DECLARE_MESSAGE_MAP() LiQgR 6j  
}; I5m][~6.?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ~b~2 >c9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;gg\;i}^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 13hE}g;.  
BOOL InitHotkey(); K(}AX+rIg  
BOOL UnInit(); ?sz)J 3  
#endif dt}_D={Be  
gB'fFkd  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. M]]pTU((  
#include "stdafx.h" #/2$+x  
#include "hook.h" 4qi[r)G  
#include <windowsx.h> [K/m  
#ifdef _DEBUG tWeFEVg  
#define new DEBUG_NEW 0\9K3  
#undef THIS_FILE 5ExDB6Bx@y  
static char THIS_FILE[] = __FILE__; Px FWJ?=  
#endif DL'iS  
#define MAX_KEY 100 x#.C4O09  
#define CTRLBIT 0x04 V5F%_,No  
#define ALTBIT 0x02 b</9Ai=  
#define SHIFTBIT 0x01 NB_ )ZEmF  
#pragma data_seg("shareddata") vmTs9"ujF,  
HHOOK hHook =NULL; @=j WHS  
UINT nHookCount =0; cTTW06^  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 2i{cQ96  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Iq7}   
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey aUHcYc\u  
static int KeyCount =0; PxS4,`#~  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 8I;XS14Q  
#pragma data_seg() \b=Pj!^gwb  
HINSTANCE hins; $Xm6N@  
void VerifyWindow(); I pzJ#  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) (6l+lru[  
//{{AFX_MSG_MAP(CHookApp) Cqii}  
// NOTE - the ClassWizard will add and remove mapping macros here. \%Ves@hG>  
// DO NOT EDIT what you see in these blocks of generated code! 6z0@I*  
//}}AFX_MSG_MAP XQ%4L-rhN  
END_MESSAGE_MAP() YKmsQ(q`N  
azQD>  
CHookApp::CHookApp() ev1 W6B-a  
{ 8lF\v/vN  
 // TODO: add construction code here, 1NQbl+w#I  
 // Place all significant initialization in InitInstance 'y]\-T  
} FTc.]laO  
[u}(57DS  
CHookApp theApp; GeszgtK{T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Q\ /uKQ  
{ ZF7IL  
 BOOL bProcessed=FALSE; ;W>Cqg=  
 if(HC_ACTION==nCode) <f@"HG l  
 { bV8g|l-4(  
  if((lParam&0xc0000000)==0xc0000000){// Key up 40E#JF#  
   switch(wParam) k>x&Ip8p  
   { &k-Vcrcz  
    case VK_MENU: W[EKD 7  
     MaskBits&=~ALTBIT; 9O{b]=>wq  
     break; ~x#w<0e>  
    case VK_CONTROL: J^R=dT!  
     MaskBits&=~CTRLBIT; I&n  
     break; X@@8"@/u|*  
    case VK_SHIFT: 8UC xn f#  
     MaskBits&=~SHIFTBIT; )-*5v D  
     break; \^I>Q _LU  
    default: //judge the key and send message q9w~A-Oh`1  
     break; akw,P$i  
   } bVP"(H]  
   for(int index=0;index<MAX_KEY;index++){ HbP!KVHyk1  
    if(hCallWnd[index]==NULL) s,#>m*Rh  
     continue; )i+2X5B`S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `qJw|u>YpJ  
    { !EUan  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Bqma\1cgb  
     bProcessed=TRUE; W>-Et7&2  
    }  w 4[{2  
   } oh# \]c\f  
  } 4DZ-bt'  
  else if((lParam&0xc000ffff)==1){ //Key down *5w{8  
   switch(wParam) Y0?5w0{  
   { ()&~@1U  
    case VK_MENU: R.=}@oPb  
     MaskBits|=ALTBIT; CLvX!O(~  
     break; aQ :5d3m0  
    case VK_CONTROL: y.KO :P?5{  
     MaskBits|=CTRLBIT; rZ8`sIWQt  
     break; *m?/O} R  
    case VK_SHIFT: bfo["  
     MaskBits|=SHIFTBIT; PkI:*\R  
     break; 87hq{tTs]  
    default: //judge the key and send message &0f5:M{P  
     break; %v20~xW :o  
   } 9z6XF]A  
   for(int index=0;index<MAX_KEY;index++) N F)~W#  
   { dOa%9[  
    if(hCallWnd[index]==NULL) w$JvB5O  
     continue; Eke5Nb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3R+|5Uq8~  
    { 2-Y<4'>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); TB0 5?F  
     bProcessed=TRUE; J:V?EE,\-  
    } Sa2>`":d  
   } 6{ =\7AY  
  } pz"0J_xDM  
  if(!bProcessed){ bygx]RC[  
   for(int index=0;index<MAX_KEY;index++){ p/+a=Yo  
    if(hCallWnd[index]==NULL) p K0"%eA  
     continue; |sJSN.8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) E>l~-PaZY  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~"A+G4jl  
   } `OSN\"\ad  
  } '],J$ge  
 } @S|XGf  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 1GzAG;UUo6  
} ,v"YqD+GC5  
6Ybg^0m  
BOOL InitHotkey() / m=HG^!  
{ -'6Dg  
 if(hHook!=NULL){ 4?B\O`sy.  
  nHookCount++; AK@9?_D  
  return TRUE; '- zD  
 } dAuJXGo  
 else 82l~G;.n3  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Bve.C  
  if(hHook!=NULL) HTG%t/S  
   nHookCount++; ti \wg  
  return (hHook!=NULL); >y"+ -7V)  
} =>-Rnc@  
BOOL UnInit() Mo^ od<  
{ -B +4+&{T  
 if(nHookCount>1){ I_]^ .o1q  
  nHookCount--; nr<4M0tIp  
  return TRUE; ]q4rlT.i  
 } Dh=9Gns9  
 BOOL unhooked = UnhookWindowsHookEx(hHook); @;"|@!l|  
 if(unhooked==TRUE){ E>K!Vrh-L  
  nHookCount=0; V:joFRH9  
  hHook=NULL; {;2PL^i  
 } Zu7)gf  
 return unhooked; q@{Bt{$x  
} 4t=G   
LGn:c;  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) uA< n  
{ RCpR3iC2  
 BOOL bAdded=FALSE; 4%4 }5UYN  
 for(int index=0;index<MAX_KEY;index++){ W)bLSL]`E  
  if(hCallWnd[index]==0){ `EaLGzw  
   hCallWnd[index]=hWnd; }~L.qG  
   HotKey[index]=cKey; {tWf  
   HotKeyMask[index]=cMask;  qi^7  
   bAdded=TRUE; ')cMiX\v  
   KeyCount++; 9iQq.$A.  
   break; F%RRd/'  
  } |!4K!_y  
 } 1eF3`  
 return bAdded; .6Pw|xu`Pw  
} 5?x>9C a  
wfH^<jY)E  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I`!<9OTBj  
{ 6^`1\ #f  
 BOOL bRemoved=FALSE; F'21jy&  
 for(int index=0;index<MAX_KEY;index++){ K|[*t~59  
  if(hCallWnd[index]==hWnd){ 2GDD!w#!j  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )?anOD[  
    hCallWnd[index]=NULL; /V'A%2Cl=T  
    HotKey[index]=0; r97pOs#5:  
    HotKeyMask[index]=0; 2fL;-\!y(  
    bRemoved=TRUE; H*PSR  
    KeyCount--; Y^wW2-,m  
    break; 8)_XJ"9)G  
   } bE !GJZ  
  } _z|65H  
 } C&(N I  
 return bRemoved; Yo6*C  
} |IzPgC  
gtppv6<Mj4  
void VerifyWindow() D9H?:pmv?  
{ asppRL||  
 for(int i=0;i<MAX_KEY;i++){  "y}--  
  if(hCallWnd!=NULL){ W:pIPDx1=!  
   if(!IsWindow(hCallWnd)){ V@g'#= {r  
    hCallWnd=NULL; )6Fok3u  
    HotKey=0; uxr #QA  
    HotKeyMask=0; _ 9F9W{'  
    KeyCount--; o6.^*%kM'  
   } W*2BT z  
  } iP7(tnlW$  
 } rX2.i7i,  
} (@fHl=! Za  
m;GCc8  
BOOL CHookApp::InitInstance() )"7iJb<E  
{ AP 2_MV4W  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Pd_U7&w,5  
 hins=AfxGetInstanceHandle(); !Dn,^  
 InitHotkey(); -lY6|79bF  
 return CWinApp::InitInstance(); 4O^xY 6m  
} 8;JWK3Gv  
'-Vt|O_Q  
int CHookApp::ExitInstance() . 1Dg s=|  
{ )vE~'W  
 VerifyWindow(); t.i 8 2Q  
 UnInit(); ;DfY#-  
 return CWinApp::ExitInstance(); _@ qjV~%Sy  
} ;U+3w~  
vN;N/mL  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 2K/4Rf0;  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) nAsh:6${  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ <L8'!q}  
#if _MSC_VER > 1000 TNe l/   
#pragma once P@V0Mi),  
#endif // _MSC_VER > 1000 8V`WO6*  
EE06h-ns  
class CCaptureDlg : public CDialog &5B'nk"  
{ 2} /aFR  
 // Construction 3 /g~A{  
 public: (c=6yV@  
  BOOL bTray; / *#r`A  
  BOOL bRegistered; - M4J JV(  
  BOOL RegisterHotkey(); dO! kk"qn  
  UCHAR cKey; T $>&[f$6  
  UCHAR cMask; ?]_$Dcmx  
  void DeleteIcon(); hj*pTuym  
  void AddIcon(); %K=?@M9i  
  UINT nCount; <lPm1/8  
  void SaveBmp(); *v!9MU9[(  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor l<58A7  
  // Dialog Data he;dq)-e9  
  //{{AFX_DATA(CCaptureDlg) 61C7.EZZ;  
  enum { IDD = IDD_CAPTURE_DIALOG }; Bu~]ey1  
  CComboBox m_Key; k8&;lgO '  
  BOOL m_bControl; BLQ6A<  
  BOOL m_bAlt; {HltvO%8  
  BOOL m_bShift; >* f-Wde  
  CString m_Path; pP&7rRhw  
  CString m_Number; O:;w3u7;u  
  //}}AFX_DATA c_$=-Khk  
  // ClassWizard generated virtual function overrides -P$PAg5"2  
  //{{AFX_VIRTUAL(CCaptureDlg) %rL.|q9  
 public: )l C)@H}  
  virtual BOOL PreTranslateMessage(MSG* pMsg); O`IQ(,yef  
 protected: uP)'FI  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support BUDi& |,  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); *5C7d*'  
  //}}AFX_VIRTUAL g[' ^L +hd  
  // Implementation 8Z8gRcv{p  
 protected: 2j [=\K]  
  HICON m_hIcon; JzQ_{J`k  
  // Generated message map functions 6,8h]?u.  
  //{{AFX_MSG(CCaptureDlg) )4e.k$X^  
  virtual BOOL OnInitDialog(); vtg !8u4  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); x}Eg.S  
  afx_msg void OnPaint(); \h/H#j ZJ  
  afx_msg HCURSOR OnQueryDragIcon(); i#n0U/  
  virtual void OnCancel(); y@S$^jk.  
  afx_msg void OnAbout(); 3)<yod=  
  afx_msg void OnBrowse(); A4x]Qh3OO  
  afx_msg void OnChange(); *SJ_z(CZm  
 //}}AFX_MSG {#vgtgBB  
 DECLARE_MESSAGE_MAP() y&$A+peJ1  
}; gV's=cQ  
#endif s%7t"-=&  
 ~d.Y&b  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file DN>[\hg  
#include "stdafx.h" {BN#h[#B{  
#include "Capture.h" G5BfNU  
#include "CaptureDlg.h" LYTdTP  
#include <windowsx.h> Ko<:Z)PS  
#pragma comment(lib,"hook.lib") U)o-8OEZ9  
#ifdef _DEBUG jp%S3)  
#define new DEBUG_NEW `KoV_2|  
#undef THIS_FILE  ~^:A{/  
static char THIS_FILE[] = __FILE__; T4Uev*A  
#endif I{ C SH  
#define IDM_SHELL WM_USER+1 DMr\ TN  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); oWT3apGO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); n:?a$Ldgm  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Z"xvh81P  
class CAboutDlg : public CDialog 2*& ^v  
{ q 'yva  
 public: A:%`wX}  
  CAboutDlg(); -l*|M(N\  
  // Dialog Data &jJL"gq"  
  //{{AFX_DATA(CAboutDlg) 6P l<'3&  
  enum { IDD = IDD_ABOUTBOX }; F0TB<1  
  //}}AFX_DATA AO4U}?  
  // ClassWizard generated virtual function overrides ,?%Zc$\LW  
  //{{AFX_VIRTUAL(CAboutDlg) m.rmM`  
 protected: +Mb.:_7'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Rh{f5-  
  //}}AFX_VIRTUAL eF$x1|  
  // Implementation (mpNcOY<D  
 protected: z43M] P<  
  //{{AFX_MSG(CAboutDlg) m=:9+z  
  //}}AFX_MSG x=P\qjSa  
  DECLARE_MESSAGE_MAP() By!o3}~g  
}; m+[Ux{$  
c7k~S-nU  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) H/ HMm{4  
{ Ax7[;|2  
 //{{AFX_DATA_INIT(CAboutDlg) &K#M*B ,*p  
 //}}AFX_DATA_INIT IM'r8 V  
} K;G~V\  
p8O2Z? \  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) :P~6~ K um  
{ ?);v`]  
 CDialog::DoDataExchange(pDX); 1.GQau~  
 //{{AFX_DATA_MAP(CAboutDlg) O,f?YJ9S  
 //}}AFX_DATA_MAP <iC(`J$D  
} i-_mTY&M  
g*_&  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) %ntRG !  
 //{{AFX_MSG_MAP(CAboutDlg) /$?}Y L,  
 // No message handlers Xl#ggub?  
 //}}AFX_MSG_MAP A?P_DA  
END_MESSAGE_MAP() G9cUD[GB  
IOmfF[  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) k="i;! G e  
: CDialog(CCaptureDlg::IDD, pParent) FcU SE  
{ X.{S*E:$u  
 //{{AFX_DATA_INIT(CCaptureDlg) \~$#1D1f  
  m_bControl = FALSE; N~)_DjQP5  
  m_bAlt = FALSE; FTUv IbT  
  m_bShift = FALSE; VlsnL8DV  
  m_Path = _T("c:\\"); ",; H`V  
  m_Number = _T("0 picture captured."); ##>H&,Dp[  
  nCount=0; qo bc<-  
  bRegistered=FALSE; Ve; n}mJ?  
  bTray=FALSE; kdeWip6Y  
 //}}AFX_DATA_INIT @qAS*3j  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 *^ZV8c}  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); m-#2n? z-  
} V U3upy<  
`Ggbi4),  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) JK5gQ3C[  
{  ZBp/sm  
 CDialog::DoDataExchange(pDX); bWU' cw  
 //{{AFX_DATA_MAP(CCaptureDlg) H<,gU`&R  
  DDX_Control(pDX, IDC_KEY, m_Key); $'M!HJxb  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); iqWQ!r^  
  DDX_Check(pDX, IDC_ALT, m_bAlt); on `3&0,.  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 6LIJ Q  
  DDX_Text(pDX, IDC_PATH, m_Path); HIZe0%WPw  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Kn1a>fLaJ_  
 //}}AFX_DATA_MAP E ~<JC"]  
} rjYJs*#  
G_,jgg7  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) >|UOz&  
//{{AFX_MSG_MAP(CCaptureDlg) %IWPM"  
 ON_WM_SYSCOMMAND() 2FJ*f/  
 ON_WM_PAINT() ^<2p~h0 \  
 ON_WM_QUERYDRAGICON() LZY"3Jn[nQ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) lt8|9"9<  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) @Jw-8Q{  
 ON_BN_CLICKED(ID_CHANGE, OnChange) SE  %pw9  
//}}AFX_MSG_MAP kt:! 7  
END_MESSAGE_MAP() YIYmiv5  
EaN6^S=  
BOOL CCaptureDlg::OnInitDialog() s2'h  
{ -[.[>&`/  
 CDialog::OnInitDialog(); u'BaKWPS  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 4|?;TE5  
 ASSERT(IDM_ABOUTBOX < 0xF000); 1=V-V<  
 CMenu* pSysMenu = GetSystemMenu(FALSE); h2d(?vOT  
 if (pSysMenu != NULL) xwo<' xT  
 { MQ8J<A Pf-  
  CString strAboutMenu; $ddCTS^  
  strAboutMenu.LoadString(IDS_ABOUTBOX); $xN|5;+  
  if (!strAboutMenu.IsEmpty()) fNFY$:4X  
  { &D*b|ilvc  
   pSysMenu->AppendMenu(MF_SEPARATOR); C~/a-  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); J)-x!y>  
  } Sdryol<  
 } $=4QO  
 SetIcon(m_hIcon, TRUE); // Set big icon 8$}<, c(  
 SetIcon(m_hIcon, FALSE); // Set small icon ]c'A%:f<  
 m_Key.SetCurSel(0); C?eH]hkZ3  
 RegisterHotkey(); <Q3c[ Y  
 CMenu* pMenu=GetSystemMenu(FALSE); .$vK&k  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 7qS)c}Q\  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Y}wyw8g/  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); G4"F+%.  
 return TRUE; // return TRUE unless you set the focus to a control 5r ^(P  
} Cw&KVw*  
H qx-;F~0  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) xJ.M;SF4  
{ nBYZ}L q  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) IH+|}z4N?>  
 { UkFC~17P  
  CAboutDlg dlgAbout; Z,PPu&lmE/  
  dlgAbout.DoModal(); =rdV ]{Wc  
 } tKXIk9e  
 else Z *x'+X  
 { j0q&&9/Jj  
  CDialog::OnSysCommand(nID, lParam); CpT jJXb  
 } 3u0RKLc\  
} r9?Mw06Wc5  
U 6)#}   
void CCaptureDlg::OnPaint() h/Y'<:  
{ Lr pM\}t  
 if (IsIconic()) scV5PUq  
 { |2A:eI8 ^  
  CPaintDC dc(this); // device context for painting SOIN']L|V[  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); do'GlU oMC  
  // Center icon in client rectangle 'LDQgC*%  
  int cxIcon = GetSystemMetrics(SM_CXICON); <N~K ;n v  
  int cyIcon = GetSystemMetrics(SM_CYICON); 4#Jg9o   
  CRect rect; A@#E@ ;lm  
  GetClientRect(&rect); =Dj#gV  
  int x = (rect.Width() - cxIcon + 1) / 2; 4CTi]E=H{  
  int y = (rect.Height() - cyIcon + 1) / 2; 6_B]MN!(  
  // Draw the icon n+M<\  
  dc.DrawIcon(x, y, m_hIcon); , W?VhO  
 } .T`%tJ-Em  
 else E2-\]?\F(  
 { *{5fq_  
  CDialog::OnPaint(); M"L=L5OH-  
 } apn*,7ps65  
} UPGtj"2v-  
s5. CFA  
HCURSOR CCaptureDlg::OnQueryDragIcon() *0ro0Z|Iq  
{ 6 !bsM"F  
 return (HCURSOR) m_hIcon; Q,Eo mt  
} |w3M7;~eF  
VIbq:U  
void CCaptureDlg::OnCancel() o4WDh@d5S  
{ N2o7%gJw  
 if(bTray) *m(=V1"  
  DeleteIcon(); 4skD(au8  
  CDialog::OnCancel(); @ N m@]q  
} ~}Pfu  
B#R|*g:x  
void CCaptureDlg::OnAbout() EdX$(scu~B  
{ NHE18_v5  
 CAboutDlg dlg; 5mR 1@  
 dlg.DoModal(); J .<F"r>  
} |V(0GB  
yt2PU_),  
void CCaptureDlg::OnBrowse() RM/ 0A|  
{ fN2lLn9/u  
 CString str; CvdN"k  
 BROWSEINFO bi; -:rUw$3J  
 char name[MAX_PATH]; wuo,kM  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); q.}CU.dp  
 bi.hwndOwner=GetSafeHwnd(); ),!qTjD  
 bi.pszDisplayName=name; B-mowmJ3dg  
 bi.lpszTitle="Select folder"; )U# K  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Uw:"n]G]D?  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi);  0+8e,  
 if(idl==NULL) |vC~HJpuv'  
  return; E" vS $  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2KZneS`  
 str.ReleaseBuffer(); ;FEqe 49  
 m_Path=str; pK4)yu+  
 if(str.GetAt(str.GetLength()-1)!='\\') 1.>m@Slr>  
  m_Path+="\\"; ptaKf4P^r  
 UpdateData(FALSE); lLIA w$  
} @}ZVtrz  
6dYMwMH  
void CCaptureDlg::SaveBmp() "Y.y:Vv;  
{ OZ&o:/*HM  
 CDC dc; GN>@ZdVG}#  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); phz&zl D  
 CBitmap bm; FGkVqZ Y2?  
 int Width=GetSystemMetrics(SM_CXSCREEN); |l!aB(NW  
 int Height=GetSystemMetrics(SM_CYSCREEN); 7[wPn`v2  
 bm.CreateCompatibleBitmap(&dc,Width,Height); dF2RH)Ud  
 CDC tdc; D/' dTrR  
 tdc.CreateCompatibleDC(&dc); Qg/rRiV  
 CBitmap*pOld=tdc.SelectObject(&bm); ss-D(K"  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); }K9H^H@r!  
 tdc.SelectObject(pOld); yh=N@Z*zP  
 BITMAP btm; 8b=_Y;  
 bm.GetBitmap(&btm); 5LMw?P.<  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; LH6 vLuf  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); }PpUAt~g  
 BITMAPINFOHEADER bih; _ x*3PE  
 bih.biBitCount=btm.bmBitsPixel; >R=|Wo`Ri  
 bih.biClrImportant=0; FiU#T.`9'  
 bih.biClrUsed=0; 3 gf1ownC  
 bih.biCompression=0; |f##5fB  
 bih.biHeight=btm.bmHeight; % u6Sr5A[s  
 bih.biPlanes=1; b`_Q8 J  
 bih.biSize=sizeof(BITMAPINFOHEADER); B7%U_F|m  
 bih.biSizeImage=size; FgO)DQm  
 bih.biWidth=btm.bmWidth; #fM'>$N  
 bih.biXPelsPerMeter=0; ,u!sjx  
 bih.biYPelsPerMeter=0; B/C,.?Or  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); D)Dr__x  
 static int filecount=0; wA.\i  
 CString name; MO]&bHH7;  
 name.Format("pict%04d.bmp",filecount++); rM "l@3hP  
 name=m_Path+name; OrG).^l  
 BITMAPFILEHEADER bfh; [S<";l8  
 bfh.bfReserved1=bfh.bfReserved2=0; i6N',&jFU  
 bfh.bfType=((WORD)('M'<< 8)|'B'); S tyfB  
 bfh.bfSize=54+size; .|=\z9_7S8  
 bfh.bfOffBits=54; E} .^kc[(4  
 CFile bf; . ]M"# \  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 92-I~ !d  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); WPDyu.QD  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); O H7FkR  
  bf.WriteHuge(lpData,size); .p$(ZH =~  
  bf.Close(); K+iP 6B  
  nCount++; E)3NxmM#  
 } )}ROLe  
 GlobalFreePtr(lpData); (iGTACoF  
 if(nCount==1) B?wq=DoG  
  m_Number.Format("%d picture captured.",nCount); 2+O'9F_v  
 else We z 5N  
  m_Number.Format("%d pictures captured.",nCount); O'~+_ykTl  
  UpdateData(FALSE); hzC>~Ub5  
} r_.S>]  
*$*ce|V5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Vz[C=_m  
{ a: K[ y  
 if(pMsg -> message == WM_KEYDOWN) CH/rp4NeSy  
 { t >sE x:  
  if(pMsg -> wParam == VK_ESCAPE) 8$|=P!7EO  
   return TRUE; )CyS#j#=  
  if(pMsg -> wParam == VK_RETURN) 2BobH_ H  
   return TRUE; J-4:H gx  
 } b>$S<td  
 return CDialog::PreTranslateMessage(pMsg); !%>7Dw(kt  
} bN88ua}k{  
iR0y"Cii  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) O1kl70,`R  
{ ]{LjRSV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ +^<](z  
  SaveBmp(); c"xK`%e  
  return FALSE; \(T /O~b2  
} ,=N.FS  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ k+4#!.HX^  
 CMenu pop; Cls%M5MH  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 07$o;W@  
 CMenu*pMenu=pop.GetSubMenu(0); '3H_wd  
 pMenu->SetDefaultItem(ID_EXITICON); [8*)8jP3  
 CPoint pt; Xx(T">]vJ  
 GetCursorPos(&pt); %%wNZ{  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); M@ZI\  
 if(id==ID_EXITICON) 9g?(BI^z  
  DeleteIcon(); s9d_GhT%-  
 else if(id==ID_EXIT) L_s:l9!r  
  OnCancel(); uwBi W  
 return FALSE; IIqUZJ  
} &"q=5e2  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); D,ln)["xm  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) C8\^#5  
 AddIcon(); TOAAQ  
 return res; K4);HJ|=  
} 8x{'@WCG%  
bYPKh  
void CCaptureDlg::AddIcon() Ic4H#w  
{ (4EI-e*6  
 NOTIFYICONDATA data; 3yXY.>'  
 data.cbSize=sizeof(NOTIFYICONDATA); k$7Jj-+~  
 CString tip; {}Za_(Y,]  
 tip.LoadString(IDS_ICONTIP); s|ITsz0,td  
 data.hIcon=GetIcon(0); b_):MQ1{  
 data.hWnd=GetSafeHwnd(); 4'Zp-k?5`  
 strcpy(data.szTip,tip); d`6 ' Z  
 data.uCallbackMessage=IDM_SHELL; V470C@  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; +t;7tQDVB  
 data.uID=98; Xs?o{]Fe  
 Shell_NotifyIcon(NIM_ADD,&data); "wHFN>5B  
 ShowWindow(SW_HIDE); 8e|%M  
 bTray=TRUE; :a)u&g@G  
} H7j0K~U0  
4a]P7fx-  
void CCaptureDlg::DeleteIcon() &! ?eL  
{ <"|,"hA  
 NOTIFYICONDATA data; GM<-&s!Uj  
 data.cbSize=sizeof(NOTIFYICONDATA); 1sH& sGy7  
 data.hWnd=GetSafeHwnd(); V$?SR44>nH  
 data.uID=98; 8&aq/4:q0  
 Shell_NotifyIcon(NIM_DELETE,&data); J)C/u{o  
 ShowWindow(SW_SHOW); Tu7QCr5*  
 SetForegroundWindow(); v}Fr@0%  
 ShowWindow(SW_SHOWNORMAL); JO< wU  
 bTray=FALSE; "w.3Q96r  
} xZv#Es%#  
YUIi;  
void CCaptureDlg::OnChange() DDH:)=;z  
{ VM,]X.  
 RegisterHotkey(); !GGkdg*-*9  
} U`m54f@U  
{Dmjm{   
BOOL CCaptureDlg::RegisterHotkey() C73 kJa  
{ _f:W?$\ho  
 UpdateData(); 3Ims6I]  
 UCHAR mask=0; # 4PVVu<  
 UCHAR key=0; &pp|U}  
 if(m_bControl) :[!j?)%>  
  mask|=4; ]P?vdgEM&  
 if(m_bAlt) C 6AUNRpl  
  mask|=2; e@OX_t_  
 if(m_bShift) {8%a5DiM  
  mask|=1; w*JGUk  
  key=Key_Table[m_Key.GetCurSel()]; $ DSZO!pB  
 if(bRegistered){ %1$,Vs<RH  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); > "=>3  
  bRegistered=FALSE; Oo% d]8W  
 } 3kMf!VL  
 cMask=mask; cpJ|w3x B  
 cKey=key; 7x4PaX(  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); t1y4 7fX6  
 return bRegistered; J S_]FsxD  
} #?9;uy<j.q  
1PV'?tXp(  
  四、小结 \)?HJ  
"!%l/_p?  
  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。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
批量上传需要先选择文件,再选择上传
认证码:
验证问题:
10+5=?,请输入中文答案:十五