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
  • 6314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: pM],-7UM  
  29("gB  
  一、实现方法 jfP2n5X83  
\3JZ =/  
  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: m \o<a|  
%X7R_>.   
#pragma data_seg("shareddata") Y~gDS^8  
HHOOK hHook =NULL; //钩子句柄 D99g}  
UINT nHookCount =0; //挂接的程序数目 R4"*<%1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 @}eEV[Lli  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 +;^Ux W  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey xP#vAR  
static int KeyCount =0; m5m}RWZ#  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 B>Tfyo  
#pragma data_seg() :)o 4fOJ8  
O=~8+sa  
  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。 ZKy)F-yX  
s~ ||Vv!  
  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: nr7#}pzo  
me:~q#k  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Q&+Jeji  
cKey,UCHAR cMask) F*m^AFjs  
{ a~ q_2S]h  
 BOOL bAdded=FALSE; nGQc;p5;  
 for(int index=0;index<MAX_KEY;index++){ 8,B?!%FP  
  if(hCallWnd[index]==0){ %IrR+f+H  
   hCallWnd[index]=hWnd; t"x 8]Gy  
   HotKey[index]=cKey; p4mi\~Q  
   HotKeyMask[index]=cMask; 4wYD-MB  
   bAdded=TRUE; <Hd8Jd4f  
   KeyCount++; vUm#^/#I  
   break; 'D`O4TsP>  
  } 8XJg  
 } j5Kw0Wy7  
 return bAdded; ZByxC*Cz  
} Geyy!sr``  
//删除热键 B7 PkCS&X  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \|e>(h!l;  
{ `_%U K=m  
 BOOL bRemoved=FALSE; _gU:!:}  
 for(int index=0;index<MAX_KEY;index++){ 8Na.H::cZ  
  if(hCallWnd[index]==hWnd){ !%MI9Ok  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8T6LD  
    hCallWnd[index]=NULL; f@S n1c,Mk  
    HotKey[index]=0; b-? wJSf|  
    HotKeyMask[index]=0; eS#kDa/ %  
    bRemoved=TRUE; $HgBzZ7A2  
    KeyCount--; x }\x3U  
    break; I(^pIe-  
   } {1?94rz  
  } e&~vO| 3w%  
 } ]oT8H?%*Y  
 return bRemoved; Dz d[<Qln  
} n/W@H Im#  
w O H{L  
(V&5EO8)  
  DLL中的钩子函数如下: o>|&k]W/  
e"}JHXs  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ba5,?FVI~  
{ AWaptw_p*  
 BOOL bProcessed=FALSE; /{1sU}k-  
 if(HC_ACTION==nCode) &T.d"i  
 { G47(LE"2b  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 !8g419Yg  
   switch(wParam) @*?)S{8  
   {  /my5s\;s|z  
    case VK_MENU: 8;PS>9<  
     MaskBits&=~ALTBIT; rA+UftC:p6  
     break; s;brs}  
    case VK_CONTROL: 1Vf?Rw  
     MaskBits&=~CTRLBIT; v C23  
     break; o<h2]TN  
    case VK_SHIFT: D;nd_{%  
     MaskBits&=~SHIFTBIT; (g" {A  
     break; 0gRj3al(  
    default: //judge the key and send message 8Z&M}Llk  
     break; ~7p!t%;$  
   } G)|Xj70  
   for(int index=0;index<MAX_KEY;index++){ *y+N-uq  
    if(hCallWnd[index]==NULL) ;X_bDiG$  
     continue;  yqH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .lsD+}  
    { m}UcF oaO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); cI Sugk~  
     bProcessed=TRUE; o*MiKgQ&  
    } 2[!3!@.  
   } u+/Uc:XK)  
  } yv[3&E?  
  else if((lParam&0xc000ffff)==1){ //有键按下 '/OcJVSR  
   switch(wParam) @h&:xA56  
   { epicY  
    case VK_MENU: }b5omHUE%  
     MaskBits|=ALTBIT; G2$<Q+UYs?  
     break; jz,K>   
    case VK_CONTROL: QhhL_vP  
     MaskBits|=CTRLBIT; A<h^.{  
     break; O2pntKI  
    case VK_SHIFT: "D\>oFu  
     MaskBits|=SHIFTBIT; - -fRhN>  
     break; Bd'X~Vj<  
    default: //judge the key and send message ?"F9~vx&G  
     break; !dQmg'_V  
   }  =oE(ur  
   for(int index=0;index<MAX_KEY;index++){ ~<N9ckK  
    if(hCallWnd[index]==NULL) ?rm3Iac0S  
     continue; _:N=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J&2 J6Eq  
    {  \gsJ1@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); bO i-QD  
     bProcessed=TRUE; 6i+<0b}!/  
    } 9^L{)t>  
   } lRk_<A  
  } mEm=SpO[$o  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 t[e]AU[}  
   for(int index=0;index<MAX_KEY;index++){ LR "=(  
    if(hCallWnd[index]==NULL) XF&_**0n  
     continue; >D jJ*vM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) E2xK GK   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); oF0DprP@  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 hW!2C6  
   } z''ejq  
  } j.&Y'C7GOC  
 } o%b6"_~%3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /78zs-  
} ;J@U){R  
KqN;a i,F  
  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: 4U8N7  
uTdx`>M,O  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); GE8.{P  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); o;9 G{Xj3@  
o)bKs>` U  
  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: Y{Ff I+  
9u6VN]divB  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) eB&.keO  
{ V3% >TNp  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ;^TSla+t+  
 { 6b7c9n Z  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 y>#_LhTX-  
  SaveBmp(); X"jL  
  return FALSE; s{Og3qUy  
 } /1v:eoF;  
 …… //其它处理及默认处理 P BVF'~f@j  
} vM@8&,;  
pO/vD~C>  
fN1b+ d~*6  
  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。 Vx}e,(i  
ddS3;Rk2  
  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。 $bDaZGy  
x5Ue"RMl+  
  二、编程步骤 :GN++\ 1pw  
Z2L7US -  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; MQQQaD:v  
v.- r %j{I  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; D^QL.Du,  
]K3bDU~  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; .kU}x3m  
V'tqsKQ!  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; q;lR|NOh  
~ _hA{$  
  5、 添加代码,编译运行程序。 8(Q|[  
A^E 6)A=  
三、程序代码 r#A*{4wz  
0h~{K  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL (q0vql  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) \11+~  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ f|=u{6  
#if _MSC_VER > 1000 {!j)j6(NY  
#pragma once L PS,\+  
#endif // _MSC_VER > 1000  &1f3e  
#ifndef __AFXWIN_H__ NBXhcfF  
#error include 'stdafx.h' before including this file for PCH it-]-=mqb  
#endif 0x,**6  
#include "resource.h" // main symbols !>"fDz<w`  
class CHookApp : public CWinApp 6g\hQ\+Z}  
{ $|g ;  
 public: -dWg1`;  
  CHookApp(); diNAT`|?#  
  // Overrides op@=0d??  
  // ClassWizard generated virtual function overrides g${JdxR:  
  //{{AFX_VIRTUAL(CHookApp) KYZ#.f@  
 public: @tJ4^<`P{  
  virtual BOOL InitInstance(); _R(9O?;q  
  virtual int ExitInstance(); ,J '_Vi  
  //}}AFX_VIRTUAL 5A$,'%d  
  //{{AFX_MSG(CHookApp) OTGy[jY"  
  // NOTE - the ClassWizard will add and remove member functions here. t-5K dLB  
  // DO NOT EDIT what you see in these blocks of generated code ! H|0-Al.{  
  //}}AFX_MSG /k[8xb  
  DECLARE_MESSAGE_MAP() W':b6}?  
}; ,>01Cs=t8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); l[]cUE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %-]a[qf3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); oY5`r)C7  
BOOL InitHotkey(); $bD`B'5  
BOOL UnInit(); [mv!r-=  
#endif 5*f54g"'  
mlCBstt{  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. f`KO#Wc  
#include "stdafx.h" }OhSCH'o6  
#include "hook.h" W"*2,R[}%  
#include <windowsx.h>  H2oxD$s  
#ifdef _DEBUG \>>P%EU,  
#define new DEBUG_NEW -$kIVh  
#undef THIS_FILE aNs8T`  
static char THIS_FILE[] = __FILE__; j74hWz+p4  
#endif dF09_nw  
#define MAX_KEY 100 J2 /19'QE  
#define CTRLBIT 0x04 ]kXW eY<  
#define ALTBIT 0x02 AN6Q~%,  
#define SHIFTBIT 0x01 :\I*_00!  
#pragma data_seg("shareddata") kt0xR)gU  
HHOOK hHook =NULL; #s81 k@#X  
UINT nHookCount =0; Gov.;hy  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey qo$ls\[X  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT &XdTY +  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Q-!gO  
static int KeyCount =0; ' tHa5`  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift  VM:|I~gJ  
#pragma data_seg() H] g=( %ok  
HINSTANCE hins; %.D!J",\/K  
void VerifyWindow(); /D1Lh_,2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp)  sa&`CEa  
//{{AFX_MSG_MAP(CHookApp) O_ZYm{T[7  
// NOTE - the ClassWizard will add and remove mapping macros here. u}%6=V  
// DO NOT EDIT what you see in these blocks of generated code! -%]1q#C>@  
//}}AFX_MSG_MAP _;U%`/T b  
END_MESSAGE_MAP() =-_hq'il  
>MKj~Ud  
CHookApp::CHookApp() zH Z;Y^{+  
{ %LzARTX  
 // TODO: add construction code here, w~'}uh  
 // Place all significant initialization in InitInstance }3_b%{  
} a$h^<D ^  
mhX66R  
CHookApp theApp; Q xA( *1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 83I 5n&)  
{ _'ebXrbZB  
 BOOL bProcessed=FALSE; #AB5}rPEI  
 if(HC_ACTION==nCode) ]jm:VF]4  
 { ez!W0  
  if((lParam&0xc0000000)==0xc0000000){// Key up ^H7xFd|>  
   switch(wParam) -|^)8  
   { GA$fueiQNs  
    case VK_MENU: "&/2 @  
     MaskBits&=~ALTBIT; YvcV801Go  
     break; 4xq|  
    case VK_CONTROL: 0M roHFh9`  
     MaskBits&=~CTRLBIT; uoOUgNwGg  
     break; $.kJBRgV*  
    case VK_SHIFT: @{q<"hT  
     MaskBits&=~SHIFTBIT; !zx8I7e4  
     break; M2w'cdHk  
    default: //judge the key and send message 9 &uf   
     break; Dw7Xy}I/  
   } 4bp})>}jB  
   for(int index=0;index<MAX_KEY;index++){ '2i !RT-  
    if(hCallWnd[index]==NULL) rm9>gKN;#  
     continue; q^sZP\i,*;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,c  ^nW  
    { "OK[uug  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?>7-a~*A@  
     bProcessed=TRUE; KK #E qJ  
    } 9( q(;|;Hp  
   } @!'}=?`  
  } 3(\D.Z  
  else if((lParam&0xc000ffff)==1){ //Key down K0_gMi+bR  
   switch(wParam) @v ^j<B  
   { #=S^i[K/  
    case VK_MENU: ;*t#:U*  
     MaskBits|=ALTBIT; _K!.TM+9  
     break; |idw?qCn  
    case VK_CONTROL: Dol{y=(3e  
     MaskBits|=CTRLBIT; DBB&6~;?  
     break; fglfnx0{  
    case VK_SHIFT: E/a2b(,Tg  
     MaskBits|=SHIFTBIT; pc0{  
     break; Y1I)w^}:  
    default: //judge the key and send message A]'jsv!+  
     break; Wh| T3&  
   } /z4c>)fV  
   for(int index=0;index<MAX_KEY;index++) Y8]@y0(  
   { 2vLun   
    if(hCallWnd[index]==NULL) z)U7  
     continue; Dqii60  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |u^S}"@3sU  
    { @-L]mLY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ltDohm?  
     bProcessed=TRUE; \>Rfa+  
    } [%^sl>,7  
   } -5 PVWL\  
  } w6cl3J&  
  if(!bProcessed){ 1n!:L!,`  
   for(int index=0;index<MAX_KEY;index++){ +Tu?PuT7k  
    if(hCallWnd[index]==NULL) vVw@^7U  
     continue; sAqy(oy#M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) T9w=k)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); rG6G~ |mS  
   } irD5;xk([  
  } l#1#3F  
 }  [. 9[?8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?..BA&zRk  
} 2O[sRm)  
=hFY-~U  
BOOL InitHotkey() 'xj5R=V  
{ l7qW)<r  
 if(hHook!=NULL){ MkoK(m{7  
  nHookCount++; r>peKo[X(  
  return TRUE; 'WE"$1  
 } CAC4A   
 else )V2W:M  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); #8"oqqYi  
  if(hHook!=NULL) X1`3KqK<9  
   nHookCount++; gh ?[x.U  
  return (hHook!=NULL); o4WQA"VxM  
} /CNsGx%%  
BOOL UnInit() ?@$xLUHR4  
{ .cQO?UKK  
 if(nHookCount>1){ <JWU@A-.y  
  nHookCount--; `HQ)][  
  return TRUE; 15Mtlb  
 } h Fv{?v  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ga%\n!S  
 if(unhooked==TRUE){ O8$~dzf,2  
  nHookCount=0; w=WF$)ZU  
  hHook=NULL; i83~&Q=  
 } oC>J{z  
 return unhooked; Lo!hyQ)  
} zT78FliY6  
3;BIwb_  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =;uMrb4  
{ 7\2I>W  
 BOOL bAdded=FALSE; )8W! |  
 for(int index=0;index<MAX_KEY;index++){ h>\C2Q  
  if(hCallWnd[index]==0){ f|q/2}Bqb  
   hCallWnd[index]=hWnd; >jAFt_  
   HotKey[index]=cKey; +:;ddV  
   HotKeyMask[index]=cMask; bp:`m>4<  
   bAdded=TRUE; Mww^  
   KeyCount++; \(j*K6#  
   break; .yZLC%}  
  } dE_Xd :>  
 } l EFd^@t  
 return bAdded; H575W"53  
} _P qq*  
Uw.')ZY=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z5 IWoY  
{ bKCE;Wu:G  
 BOOL bRemoved=FALSE; ;F"!$Z/  
 for(int index=0;index<MAX_KEY;index++){ MIIl+   
  if(hCallWnd[index]==hWnd){ y ;[~(Yg[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ js81@WX!c  
    hCallWnd[index]=NULL; H u;"TG  
    HotKey[index]=0; G9Uc }z  
    HotKeyMask[index]=0; Z\CvaX  
    bRemoved=TRUE; Ie. on)  
    KeyCount--; fasW b&~z  
    break; +112{v=!i  
   } ]64}Xob87_  
  } B~Kx Up  
 } ?/3wO/7[  
 return bRemoved; W|>jj$/o  
} QLO;D)fC  
NLMvi!5w,  
void VerifyWindow() ,w#lUg p  
{ R}0gIp=  
 for(int i=0;i<MAX_KEY;i++){ R|\eBnfI  
  if(hCallWnd!=NULL){ hD ~/ywS&  
   if(!IsWindow(hCallWnd)){ d,(y$V+  
    hCallWnd=NULL; CwX?%$S   
    HotKey=0; G)?*BH  
    HotKeyMask=0; 7 <^+)DsS?  
    KeyCount--; 2 L4[~>  
   } ]H n:c'aT  
  } rS BI'op  
 } A{zqr^/h  
} hc|A:v)]  
NlEyT9  
BOOL CHookApp::InitInstance() ~{Iw[,MJ  
{ >+dS PI  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); cpa" ,8  
 hins=AfxGetInstanceHandle(); 8IlUbj  
 InitHotkey(); ML12&E>  
 return CWinApp::InitInstance(); kzZgNv#G;  
} ;\0|1Eem`  
vTK%8qoZ  
int CHookApp::ExitInstance() k2D*`\ D  
{ tw$EwNI[  
 VerifyWindow(); J=3{<Xl  
 UnInit(); 4P3RRS  
 return CWinApp::ExitInstance(); Pw<?Dw]m  
} ]%6%rq%9C  
k={D!4kKz  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file b \}a   
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) caQ1SV^{9  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ d%P2V>P  
#if _MSC_VER > 1000 FSQB{9,H  
#pragma once \|Af26  
#endif // _MSC_VER > 1000 .z,-ThTH@\  
ElW\;C:K*  
class CCaptureDlg : public CDialog MeBTc&S<  
{ DS(>R!bb  
 // Construction  ImhkU%  
 public: |M7C=z='  
  BOOL bTray; K]m#~J3d>  
  BOOL bRegistered; n{4iW_/D  
  BOOL RegisterHotkey(); zq</(5H  
  UCHAR cKey; ]"T157F  
  UCHAR cMask; fYP,V0P  
  void DeleteIcon(); fF0K].  
  void AddIcon(); ' bl9fO4v  
  UINT nCount; oT{9P?K8  
  void SaveBmp(); u* pQVU  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor eQ[akVMk  
  // Dialog Data lu{ *]!  
  //{{AFX_DATA(CCaptureDlg) j-1V,V=  
  enum { IDD = IDD_CAPTURE_DIALOG }; ~%*l>GkP*  
  CComboBox m_Key; ,9ueHE  
  BOOL m_bControl; "QOQ  
  BOOL m_bAlt; g4WmUV#wp  
  BOOL m_bShift; D=a*Xu2zq  
  CString m_Path; l\{Qnb(  
  CString m_Number; *,X)tZ6VX  
  //}}AFX_DATA }SSg>.48w  
  // ClassWizard generated virtual function overrides %_E5B6xi{  
  //{{AFX_VIRTUAL(CCaptureDlg) KJT N"hF   
 public: DIGw4g4Kt  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 6Mc&=}bV  
 protected: k5\V:P=#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support U=D;Cj Ah  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); B@-\.m  
  //}}AFX_VIRTUAL 7RUztu\_  
  // Implementation Ye On   
 protected: [1(eSH  
  HICON m_hIcon; ti+e U$  
  // Generated message map functions cY!Y?O  
  //{{AFX_MSG(CCaptureDlg) m%J?5rR3  
  virtual BOOL OnInitDialog(); ;b [>{Q;  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); =r/K#hOR\J  
  afx_msg void OnPaint(); 6E) T;R(@  
  afx_msg HCURSOR OnQueryDragIcon(); co\?SgE35  
  virtual void OnCancel(); TYuP EVEXZ  
  afx_msg void OnAbout(); ODu/B'*  
  afx_msg void OnBrowse(); oX)a6FXK>  
  afx_msg void OnChange(); <. Tllk@r)  
 //}}AFX_MSG O;VqrO  
 DECLARE_MESSAGE_MAP() -btNwE6[.  
}; xCL)<8[R,}  
#endif =M 8Mt/P  
;*qXjv& K  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file KN_n:`cH{  
#include "stdafx.h" g=D]=&H  
#include "Capture.h" M{p6&eg  
#include "CaptureDlg.h" !=21K0~t#  
#include <windowsx.h> '~ b  
#pragma comment(lib,"hook.lib") Ut~YvWc9  
#ifdef _DEBUG -!+i ^r  
#define new DEBUG_NEW Z|@-=S(.  
#undef THIS_FILE ruagJS)+  
static char THIS_FILE[] = __FILE__; kVtP~  
#endif *P *.'XM  
#define IDM_SHELL WM_USER+1 :c]y/lQmV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~*EipxhstJ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a)2l9  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; D7pQWlN\  
class CAboutDlg : public CDialog Y_*KAr'{P  
{ @GAj%MK$  
 public: 'dwsm7Xd  
  CAboutDlg(); 5L6.7}B  
  // Dialog Data $!G|+OuTR  
  //{{AFX_DATA(CAboutDlg) 1N _"Mm{  
  enum { IDD = IDD_ABOUTBOX }; [uqr  
  //}}AFX_DATA }%wP^6G*x\  
  // ClassWizard generated virtual function overrides E7h@c>IK  
  //{{AFX_VIRTUAL(CAboutDlg) 7V=deYt_p  
 protected: tz65Tn_M  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #p=+RTZ<  
  //}}AFX_VIRTUAL (1S9+H>g  
  // Implementation =4q5KI  
 protected: ; t7F%cDA  
  //{{AFX_MSG(CAboutDlg) !(bYh`Uy  
  //}}AFX_MSG W9gQho%9b  
  DECLARE_MESSAGE_MAP() }k AE  
}; tx;2C|S$oU  
 @B{  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) bL<H$DB6  
{ 5Zc  
 //{{AFX_DATA_INIT(CAboutDlg) 8Ie0L3d-  
 //}}AFX_DATA_INIT :D}?H@(69  
} 5Qg*j/z?  
n S$4[!0  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) TS=%iMa  
{ dT1UYG}>j  
 CDialog::DoDataExchange(pDX); \l(}8;5}  
 //{{AFX_DATA_MAP(CAboutDlg) "c~``i\G   
 //}}AFX_DATA_MAP zhE4:g9v  
} Fc=F2Mo?  
D3 +|Os)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) e+Mm!\ ;`  
 //{{AFX_MSG_MAP(CAboutDlg) SN[yC  
 // No message handlers $m>( kd1  
 //}}AFX_MSG_MAP ]nV_K}!w  
END_MESSAGE_MAP() jMWTNZ  
6;I zw$X  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !U5Cwq  
: CDialog(CCaptureDlg::IDD, pParent) %\v  
{ k!qOE\%B  
 //{{AFX_DATA_INIT(CCaptureDlg) 1\-lAk!   
  m_bControl = FALSE; aG"  
  m_bAlt = FALSE; #/(L.5d[  
  m_bShift = FALSE; 6UN{Vjr%`  
  m_Path = _T("c:\\"); (q 7;/n  
  m_Number = _T("0 picture captured."); N<(rP1)`v  
  nCount=0; ]%7m+-h@  
  bRegistered=FALSE; Yo5ged]i  
  bTray=FALSE; N+R{&v7=F%  
 //}}AFX_DATA_INIT +CEt:KQ   
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #I ,c'Vj  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); brE%/%! e  
} /ORK9 g  
KPK`C0mg@k  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ,iiI5FR  
{ RionKiN  
 CDialog::DoDataExchange(pDX); ctb , w  
 //{{AFX_DATA_MAP(CCaptureDlg) pdQaVe7tRo  
  DDX_Control(pDX, IDC_KEY, m_Key); *JW.ca}  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 2#`d:@r  
  DDX_Check(pDX, IDC_ALT, m_bAlt); $43CNnf3N  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); >&Ye(3w&  
  DDX_Text(pDX, IDC_PATH, m_Path); |%Y=]@f  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Oa5-^&I  
 //}}AFX_DATA_MAP B 4e}%  
} /KiaLS  
+ZwTi!W  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) UA0R)BH'  
//{{AFX_MSG_MAP(CCaptureDlg) Dxr4B<  
 ON_WM_SYSCOMMAND()  !vr A\d  
 ON_WM_PAINT() W70BRXe04D  
 ON_WM_QUERYDRAGICON() %&O'>L  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) _=5\$6  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 0,LUi*10  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 8r.MODZG/  
//}}AFX_MSG_MAP F j"]C.6B.  
END_MESSAGE_MAP() @bFl8-  
F>u/Lh!  
BOOL CCaptureDlg::OnInitDialog() '~6l 6wi  
{ 3z 5"Ckzb  
 CDialog::OnInitDialog(); +I~U8v-  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); tN)Vpb\J  
 ASSERT(IDM_ABOUTBOX < 0xF000); ' #r^W2  
 CMenu* pSysMenu = GetSystemMenu(FALSE); a- /p/ I-%  
 if (pSysMenu != NULL) G)5Uiu:^X  
 { /X\:3P  
  CString strAboutMenu; e+MsFXnB8  
  strAboutMenu.LoadString(IDS_ABOUTBOX); .fzns20u  
  if (!strAboutMenu.IsEmpty()) Yj>\WH  
  { toox`|  
   pSysMenu->AppendMenu(MF_SEPARATOR); Im`R2_(]  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); VDy_s8Z#  
  } %+$!ctn  
 } (n{!~'3  
 SetIcon(m_hIcon, TRUE); // Set big icon {2&MyxV  
 SetIcon(m_hIcon, FALSE); // Set small icon ^6 ,}*@  
 m_Key.SetCurSel(0); mc6W"  
 RegisterHotkey(); s[*I210  
 CMenu* pMenu=GetSystemMenu(FALSE); F.R0c@&W  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); aOW~! f/M  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); \?k"AtL  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); tUFXx\p  
 return TRUE; // return TRUE unless you set the focus to a control "FfP&lF/  
} o, qBMo^.  
j62oA$z  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ~qW"v^<  
{ MB5X$5it  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Of$gs-  
 { wMiRN2\^  
  CAboutDlg dlgAbout; zL:k(7E  
  dlgAbout.DoModal(); |VX0o2  
 } H`U>ZJ.  
 else 6FI`0j=~  
 { iHOvCrp+X  
  CDialog::OnSysCommand(nID, lParam); yH@2nAn  
 } Z@>WUw@ F  
} +3;[1dpgf  
<d hBO  
void CCaptureDlg::OnPaint() =hKu85  
{ g>Kh? (  
 if (IsIconic()) cNuBWLG  
 { '~Gk{'Nx"  
  CPaintDC dc(this); // device context for painting {B\lk:"X  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); oth=#hfU^  
  // Center icon in client rectangle hrnY0  
  int cxIcon = GetSystemMetrics(SM_CXICON); V^p XbDRl  
  int cyIcon = GetSystemMetrics(SM_CYICON); q/\Hh9`  
  CRect rect; ZltY_5l  
  GetClientRect(&rect); ~D Ta% J  
  int x = (rect.Width() - cxIcon + 1) / 2; QcDtZg\  
  int y = (rect.Height() - cyIcon + 1) / 2; \M-$|04Qt  
  // Draw the icon LfS]m>>e  
  dc.DrawIcon(x, y, m_hIcon); )pt#Pu  
 } N Y~y:*:Q  
 else ehYGw2  
 { []eZO_o6j  
  CDialog::OnPaint(); bMF`KRP2  
 } g`zC0~D2  
} qgLj^{  
]a=Bc~g91  
HCURSOR CCaptureDlg::OnQueryDragIcon() !xZ`()D#  
{ Ja6PX P]'  
 return (HCURSOR) m_hIcon; qeZ*!H6-  
} u'EzYJ7  
~bk+JK- >  
void CCaptureDlg::OnCancel() c`G~.paY|  
{ V4 Wn  
 if(bTray) |zSoA=7?  
  DeleteIcon(); <DM:YWNa  
  CDialog::OnCancel(); i/WiSwh:  
} l ilF _ y  
GGwHz]1L  
void CCaptureDlg::OnAbout() be{tyV  
{ *+'l|VaVq\  
 CAboutDlg dlg; .1& F p  
 dlg.DoModal(); MDKiwT@#  
} #~88[i-6  
T $;N8x[  
void CCaptureDlg::OnBrowse() ~w9ZSSb4  
{ 'gwh:8Xc  
 CString str; 0E#3XhU  
 BROWSEINFO bi; dy*CDRU4  
 char name[MAX_PATH]; at `\7YfQp  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /WKp\r(Hp  
 bi.hwndOwner=GetSafeHwnd(); ~,.}@XlgT.  
 bi.pszDisplayName=name; VN9C@ ;'$  
 bi.lpszTitle="Select folder"; v5o@ls  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 86\B|!   
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Arb-,[kwN  
 if(idl==NULL) KFMEY\6\h  
  return; J~vK`+Zs  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !>5!Fb=Sy  
 str.ReleaseBuffer();  Enj],I  
 m_Path=str; oVSq#I4  
 if(str.GetAt(str.GetLength()-1)!='\\') ;iEFG^'tG  
  m_Path+="\\"; KUqD<Jj?  
 UpdateData(FALSE); HN tl>H  
} ?rn#S8nNx<  
,d34v*U  
void CCaptureDlg::SaveBmp() ()v{HB i  
{ & ]/Z~Vt  
 CDC dc; Hh1OD?N)  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); [m 3k_;[  
 CBitmap bm; p#95Q  
 int Width=GetSystemMetrics(SM_CXSCREEN); PH}^RR{H[  
 int Height=GetSystemMetrics(SM_CYSCREEN); _ mw(~r8R  
 bm.CreateCompatibleBitmap(&dc,Width,Height); hd}"%9p  
 CDC tdc; OjiQBsgnj  
 tdc.CreateCompatibleDC(&dc); \!4sd2Yi  
 CBitmap*pOld=tdc.SelectObject(&bm); UF00K1dbz  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); FWbA+{8  
 tdc.SelectObject(pOld); _=eeZ4f  
 BITMAP btm; G}b LWA  
 bm.GetBitmap(&btm); J<{@D9r9<~  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; M _z-~G  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); `o~9a N  
 BITMAPINFOHEADER bih; m mj6YQ0a  
 bih.biBitCount=btm.bmBitsPixel; isP4*g&%x  
 bih.biClrImportant=0; IuQY~!  
 bih.biClrUsed=0; SrVJ Q~ :>  
 bih.biCompression=0; `<L6Q2Y>j  
 bih.biHeight=btm.bmHeight; e/<Og\}P/  
 bih.biPlanes=1; `)W}4itm  
 bih.biSize=sizeof(BITMAPINFOHEADER); {s=$.Kg  
 bih.biSizeImage=size; "3i=kvdz  
 bih.biWidth=btm.bmWidth; g2<xr;<t^  
 bih.biXPelsPerMeter=0; Px)/`'D  
 bih.biYPelsPerMeter=0; xv{iWJcs  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); m_z1|zM}o  
 static int filecount=0;  ? h$>7|  
 CString name; 7QlA/iKqK  
 name.Format("pict%04d.bmp",filecount++); Rz!E=1Y$  
 name=m_Path+name; F*_mHYa;  
 BITMAPFILEHEADER bfh; H[{ch t h  
 bfh.bfReserved1=bfh.bfReserved2=0; \5%T'S@5  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 0r+%5}|-K  
 bfh.bfSize=54+size; uz1t uX_  
 bfh.bfOffBits=54; c!BiGw,;  
 CFile bf; W1s4[rL!Ht  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ m"!!)  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); v?\bvg\E  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 5"[Qs|VjA6  
  bf.WriteHuge(lpData,size); %@{);5[  
  bf.Close(); DaW_-:@s  
  nCount++; 24Y~x`W   
 } ,z?Re)q m  
 GlobalFreePtr(lpData); #n'tpp~O  
 if(nCount==1) \DE`tkV8  
  m_Number.Format("%d picture captured.",nCount); j_?U6$xi  
 else k.DDfuKN  
  m_Number.Format("%d pictures captured.",nCount); uSs~P%@6|  
  UpdateData(FALSE); GJA3  
} ,OLN%2Sq  
^AUmIyf_  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) [Uezi1I  
{ pt;kN&A^  
 if(pMsg -> message == WM_KEYDOWN) Ve&(izIh  
 { m.MOn3n]  
  if(pMsg -> wParam == VK_ESCAPE) X }yEMe{T  
   return TRUE; XY5I5H_U  
  if(pMsg -> wParam == VK_RETURN) nJYcC"f  
   return TRUE; rBP!RSl1  
 } 7 3k3(rZ  
 return CDialog::PreTranslateMessage(pMsg); Nd&u*&S  
} kg$<^:uX  
~h;c3#wuc  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +[JGi"ca  
{ .(  vS/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 5M~\'\;  
  SaveBmp(); '$M=H.  
  return FALSE; :Q\b$=,:  
} Xv'M\T}6C+  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ztG_::QtG]  
 CMenu pop; DB yRP-TH  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); +>oVc\$  
 CMenu*pMenu=pop.GetSubMenu(0); aT#R#7<Eg  
 pMenu->SetDefaultItem(ID_EXITICON); 5w`v 3o  
 CPoint pt; Y XH9Q@Gn  
 GetCursorPos(&pt); <BQ4x.[  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 6ZVJ2xs[%  
 if(id==ID_EXITICON) !9i,V{$c`"  
  DeleteIcon(); :<s)QD  
 else if(id==ID_EXIT) iuq-M?1  
  OnCancel(); GP uAIoBo  
 return FALSE; ] w FFGy  
} }`yIO"{8n  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); MOyQ4<_  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) un[Z$moN"  
 AddIcon(); aU2O5z&  
 return res; <!&&Qd-d6H  
} DL2gui3  
JLRw`V,o7  
void CCaptureDlg::AddIcon() NrTQ}_3)  
{ " 7RQrz  
 NOTIFYICONDATA data; VuFH >8n  
 data.cbSize=sizeof(NOTIFYICONDATA); e.i5j^5u  
 CString tip; UR?[ba_h   
 tip.LoadString(IDS_ICONTIP); iwL\Ha  
 data.hIcon=GetIcon(0); 8@qYzSx[  
 data.hWnd=GetSafeHwnd(); 8J%^gy>m]  
 strcpy(data.szTip,tip); ;t@zH+*}  
 data.uCallbackMessage=IDM_SHELL; . #;ZM[v  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; `jJ5us  
 data.uID=98; ~;|  
 Shell_NotifyIcon(NIM_ADD,&data); GLL,  
 ShowWindow(SW_HIDE); $CO^dFf  
 bTray=TRUE; U\y];\~H  
} [[?:,6I  
RNiZ2:  
void CCaptureDlg::DeleteIcon() cp2e,%o  
{ zHr1FxD  
 NOTIFYICONDATA data; lx~!FLn  
 data.cbSize=sizeof(NOTIFYICONDATA); &M ~*w~w`  
 data.hWnd=GetSafeHwnd(); 0,nDyTS^  
 data.uID=98; uU6+cDp  
 Shell_NotifyIcon(NIM_DELETE,&data); 7[:9vY  
 ShowWindow(SW_SHOW); DPi%[CRH  
 SetForegroundWindow(); qr(SAIX"  
 ShowWindow(SW_SHOWNORMAL); C2,,+* v  
 bTray=FALSE; cxrUk$f  
} 3t(nV4uDF  
./)A6O*#  
void CCaptureDlg::OnChange() Xf9<kbRw/  
{ ) ]U-7  
 RegisterHotkey(); 1,Uv;s;{  
} x\!Qe\lE  
)`^t,x<S  
BOOL CCaptureDlg::RegisterHotkey() wCvtw[6  
{ y_38;8ex  
 UpdateData(); "W|Sh#JF  
 UCHAR mask=0; d> `9!)  
 UCHAR key=0; ?I`']|I  
 if(m_bControl) _{KQQ5k\  
  mask|=4; v'S}&zmF]  
 if(m_bAlt) >tqLwC."'  
  mask|=2; Tv3Bej  
 if(m_bShift) F>)u<f,C  
  mask|=1; 93[c^sc9*a  
  key=Key_Table[m_Key.GetCurSel()]; v$w!hYsQ  
 if(bRegistered){ ?Il$f_"B:  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ]6p?mBuQ  
  bRegistered=FALSE; kp[+Iun?  
 } I2q C,Nkk  
 cMask=mask; qn6Y(@<[  
 cKey=key; f$NudG!S  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); D(s[=$zua  
 return bRegistered; ! 9k)hP  
} P6zy<w  
WL7R.!P  
  四、小结 6?Rm>+2>v  
(+38z)f  
  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
如果您提交过一次失败了,可以用”恢复数据”来恢复帖子内容
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八