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
  • 4791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: c9O0YQ3&8  
  XlJA}^e  
  一、实现方法 5c ($~EFr  
K#;EjR4H  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 1ir~WFP  
?v,4seRuz  
#pragma data_seg("shareddata") pq +~|  
HHOOK hHook =NULL; //钩子句柄 ;&9wG`  
UINT nHookCount =0; //挂接的程序数目 0zc~!r~  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 }cO}H2m  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 s;W1YN  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 6 K-jje;)  
static int KeyCount =0; Z/oP?2/Afh  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -'Oq.$Qq  
#pragma data_seg() ydMfV-  
Qm@v}pD  
  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。 5: vy_e&  
C ^ 1;r9  
  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: pxV@fH+`  
=bh.V@*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 9jf2b  
cKey,UCHAR cMask) 'Ivr =-  
{ mw fl x8  
 BOOL bAdded=FALSE; F.$NYr/|y  
 for(int index=0;index<MAX_KEY;index++){ C^fUhLVSZ^  
  if(hCallWnd[index]==0){ {w52]5l  
   hCallWnd[index]=hWnd; d: LP8  
   HotKey[index]=cKey; -_T@kg[0zB  
   HotKeyMask[index]=cMask; &XZS}n  
   bAdded=TRUE; b |JM4jgK  
   KeyCount++; !cA4erBP  
   break; RGz NZc  
  } LgJUMR8vUO  
 } dS)c~:&+  
 return bAdded; fBZR  
} M&ec%<lM  
//删除热键 !_pryNcb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;To][J  
{ &? z6f9*$  
 BOOL bRemoved=FALSE; 2 `nOYK  
 for(int index=0;index<MAX_KEY;index++){ ;H`>jI$  
  if(hCallWnd[index]==hWnd){ :FWo,fq?:{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ZuVes?&j  
    hCallWnd[index]=NULL; *c' hmA s  
    HotKey[index]=0; I7} o>{  
    HotKeyMask[index]=0; gF8n{b  
    bRemoved=TRUE; m8NKuhu  
    KeyCount--; gFAtIx4  
    break; &pEr;:E  
   } 65AG# O5R  
  } NTy0NH  
 } rFU|oDF  
 return bRemoved; ^gd[UC-"w  
} KV]8o'  
d'*:2;)g^  
wC>Xu.Z:  
  DLL中的钩子函数如下: \%$z!]S>  
@`H47@e  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Hribk[99  
{ WJF#+)P:Y  
 BOOL bProcessed=FALSE; pqnZ:'V  
 if(HC_ACTION==nCode) `AcT}. u  
 { |}2X|4&X  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 4.qW ~ W{  
   switch(wParam) ^E= w3g&  
   {  :y8wv|m  
    case VK_MENU: 1PnWgu  
     MaskBits&=~ALTBIT; uwhb-.w  
     break; f]37Xl%I  
    case VK_CONTROL: 2SlOqH1  
     MaskBits&=~CTRLBIT; L0dj 76'M  
     break; 9~6)u=4sS"  
    case VK_SHIFT: |Y|gT*v  
     MaskBits&=~SHIFTBIT;  k.("<)  
     break; q;L~5q."E  
    default: //judge the key and send message ?/ Cl  
     break; g}Esj"7  
   } CF_pIfbaf  
   for(int index=0;index<MAX_KEY;index++){ A0`#n|(Ad!  
    if(hCallWnd[index]==NULL) p`}'-A|@  
     continue; Ed+"F{!eQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wR*>9LjeG  
    { W&Pp5KR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); R0_O/o+{  
     bProcessed=TRUE; "l.1 UB&  
    } 5^7q 2".  
   } e SlZAdK  
  } E"[h20`\/  
  else if((lParam&0xc000ffff)==1){ //有键按下 bUBQ  
   switch(wParam) Ihn+_H u  
   {  Q  
    case VK_MENU: F,'rW:{HMt  
     MaskBits|=ALTBIT; ERQc1G]3Dd  
     break; (@"5:M  
    case VK_CONTROL: ne (zGJd  
     MaskBits|=CTRLBIT; 2qkZ B0[  
     break; bJ#]Xm(]D  
    case VK_SHIFT: Q>[Xm)jr:  
     MaskBits|=SHIFTBIT; S#wy+*  
     break; "0edk"hk  
    default: //judge the key and send message H@%Y"iIUP  
     break; rjLPX  
   } (;.wsz &K  
   for(int index=0;index<MAX_KEY;index++){ 4UV<Q*B\F  
    if(hCallWnd[index]==NULL) X:1&Pdi  
     continue; U81--'@y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) isiehKkD  
    { LqA&@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); WXzSf.8p|  
     bProcessed=TRUE; ejjL>'G/|%  
    } y +2  
   } 2V6kCy@V  
  } 6+s10?  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 M1 5_  
   for(int index=0;index<MAX_KEY;index++){ 8nSEAr~  
    if(hCallWnd[index]==NULL) ccPTJ/%$  
     continue; 9z0G0QW[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Zl4X,9Wt  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4,)EG1  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 "ytPS~  
   } psaPrE  
  } *@1(!A  
 } c1x{$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); PDi]zp9>H  
} g,61'5\  
=}1)/gcM  
  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: <Mq vGXI  
N3rq8Rk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ??u*qO:p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dvX[,*wz  
 'K7m!y  
  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: \Hs*46@TC  
nd4Z5=X  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gL(_!mcwu  
{ ;.'\8!j  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) L%Mj{fJ>Wm  
 { mQka?_if)  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 4A {6)<e  
  SaveBmp(); BV-(`#~:y  
  return FALSE; V=cJdF  
 } s'4%ZE2Dr  
 …… //其它处理及默认处理 Zk:_Yiki&  
} qvs&*lBY  
>f*-9  
"pInb5F  
  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。 lh`ZEvt  
nQaryL  
  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。 ZR8%h<  
q*'-G]tH=  
  二、编程步骤 \~BYY|UB;W  
r >;(\_@  
  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"; XEe$Wh  
# H)\ts  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; a9N$I@bi]  
8quH#IhB  
  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; %+ : $uk[  
|QHIB?C?`  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; zb,YYE1  
LF X[v   
  5、 添加代码,编译运行程序。 HrS-o=  
JH+uBZh6  
三、程序代码 j^)=<+Q;=  
cES8%UC^i  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL K +l-A>Ic  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) W!R7D%nX  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ %% +@s   
#if _MSC_VER > 1000 9yYNX;C  
#pragma once c1M *w9o  
#endif // _MSC_VER > 1000 ufB9\yl{~  
#ifndef __AFXWIN_H__ iit 5IV  
#error include 'stdafx.h' before including this file for PCH r*kz`cJ  
#endif ,X)/ T!ff  
#include "resource.h" // main symbols orZwm9#].  
class CHookApp : public CWinApp b>@fHmpwD  
{ q-r5zGI  
 public: /}Ct2w&<k  
  CHookApp(); lGXr-K?+Y  
  // Overrides =l4F/?u]f@  
  // ClassWizard generated virtual function overrides S9E<)L  
  //{{AFX_VIRTUAL(CHookApp) ;%mdSaf  
 public: ?OBB)hj  
  virtual BOOL InitInstance(); +HF*X~},i  
  virtual int ExitInstance(); 4Ix~Feuph  
  //}}AFX_VIRTUAL c8oE,-~  
  //{{AFX_MSG(CHookApp) 6Tg'9|g  
  // NOTE - the ClassWizard will add and remove member functions here. F> b<t.yV  
  // DO NOT EDIT what you see in these blocks of generated code ! l'RuzBQr  
  //}}AFX_MSG ]htx9ds=  
  DECLARE_MESSAGE_MAP() ge[&og/$  
}; 97n,^t2F\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); X<uH [  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @#::C@V]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @5\/L6SRfL  
BOOL InitHotkey(); fl71{jJ_  
BOOL UnInit(); rW[7 _4  
#endif )AXa.y  
2$O6%0  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. :9W)CwZ)V  
#include "stdafx.h" W:1GY#Pe  
#include "hook.h" jF 6[+bW<  
#include <windowsx.h> 66'AaA;0^i  
#ifdef _DEBUG IRbZ ;*3dO  
#define new DEBUG_NEW 7,ffY/  
#undef THIS_FILE x?2y^3<5  
static char THIS_FILE[] = __FILE__; (P 9$Ei0fv  
#endif TB#oauJm,  
#define MAX_KEY 100 p;rT#R&6>  
#define CTRLBIT 0x04 EoOwu-{  
#define ALTBIT 0x02 ;|.IUXEgcF  
#define SHIFTBIT 0x01 V&>mD"~MP  
#pragma data_seg("shareddata") , R $ZZ4  
HHOOK hHook =NULL; 7Yly^  
UINT nHookCount =0; /S`d?AV  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey e[%g'}D:-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Ew2ksZ>B]&  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey J72 YZrc  
static int KeyCount =0; o%l|16DR  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ^w~Utx4  
#pragma data_seg() ;mXw4_{  
HINSTANCE hins; B'KZ >jO  
void VerifyWindow(); YvPs   
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) !po29w:S  
//{{AFX_MSG_MAP(CHookApp) j6&7tK,  
// NOTE - the ClassWizard will add and remove mapping macros here. cp 5  
// DO NOT EDIT what you see in these blocks of generated code! Am)XbN')1  
//}}AFX_MSG_MAP gg QI  
END_MESSAGE_MAP() htHnQ4Q  
ZJ}|t  
CHookApp::CHookApp() oT[8Iu  
{ z/t+t_y  
 // TODO: add construction code here, ym6gj#2m  
 // Place all significant initialization in InitInstance QE~#eo  
} wIK&EGQ  
[ FNA:  
CHookApp theApp; `YPNVm<3)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) =xPBolxm5U  
{ Y 9~z7  
 BOOL bProcessed=FALSE; usOIbrQ  
 if(HC_ACTION==nCode) S<DS|qOo  
 { >TwL&la  
  if((lParam&0xc0000000)==0xc0000000){// Key up P*6&0\af|  
   switch(wParam) M UqV$#4@I  
   { )Tj\ym-Vl  
    case VK_MENU: J2Eb"y>/;  
     MaskBits&=~ALTBIT; Pt8 U0)i)  
     break; Xw<Nnvz6  
    case VK_CONTROL: "~aCW~  
     MaskBits&=~CTRLBIT; ^r0mx{i&  
     break; 9 e0Oj3!B  
    case VK_SHIFT: ompkDl\E  
     MaskBits&=~SHIFTBIT; 2B&|0&WI  
     break; s(M8 Y  
    default: //judge the key and send message F<N{ x^  
     break; I:,D:00+  
   } Wo~#R   
   for(int index=0;index<MAX_KEY;index++){ y1+~IjY  
    if(hCallWnd[index]==NULL) ee{8C~  
     continue; O;~d ao  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Pdw[#X<[`  
    { 9Sk?tl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -<.b3Mh  
     bProcessed=TRUE; mqb6MnK -  
    } e$y VV#  
   } ~$Pz`amT|  
  } {;XO'  
  else if((lParam&0xc000ffff)==1){ //Key down aC=D_JJ\  
   switch(wParam) 5<KY}  
   { BjIKs~CT  
    case VK_MENU: KsBi<wY  
     MaskBits|=ALTBIT; RE}$(T=  
     break; ({#M*=&"  
    case VK_CONTROL: f S(IN~  
     MaskBits|=CTRLBIT; (lR9x6yf  
     break; <X1^w  
    case VK_SHIFT: "=9kX`(1y  
     MaskBits|=SHIFTBIT; tN:PWj5  
     break; q(I`g;MF  
    default: //judge the key and send message %{ToWLb{I  
     break; C"!k`i=Lj  
   } ds"q1  
   for(int index=0;index<MAX_KEY;index++) sZ9VXnz24  
   { )I`Ma6bX  
    if(hCallWnd[index]==NULL) 01" b9`jU  
     continue; Zjx:1c= b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \%+5p"Z<  
    { uRfFPOYH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); d y^zOqc  
     bProcessed=TRUE; ,wE cRN w  
    } JM-+p  
   } Yx{qVU  
  } Kt3 ]r:&J  
  if(!bProcessed){ 9k[>(LC  
   for(int index=0;index<MAX_KEY;index++){ wc#E:GJcK  
    if(hCallWnd[index]==NULL) X,"(G}KUA  
     continue; mIX[HDy:V$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Xv'5%o^i*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *eonXJYD  
   } Juqe%he`  
  } ~E tW B  
 } I>(\B|\6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); vMB`TpZ  
} Wy`ve~y  
:AM5EO  
BOOL InitHotkey() BHa'`lCb  
{ -%eBip,'yl  
 if(hHook!=NULL){  rr=e  
  nHookCount++; pZg}7F{$  
  return TRUE; -@EAL:kY  
 } $ 'obj  
 else T,D(Xh  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ^$I8ga  
  if(hHook!=NULL) ckTk2xPQ  
   nHookCount++; z nxAP|  
  return (hHook!=NULL); c_#+xGS!7  
} MQ{.%  
BOOL UnInit() o6[aP[~F  
{ |kXx9vGq@  
 if(nHookCount>1){ c/Ykk7T9--  
  nHookCount--; 2)zAX"#/  
  return TRUE; C>:'@o Z  
 } b,Vg3BS  
 BOOL unhooked = UnhookWindowsHookEx(hHook); }[gk9uM_7  
 if(unhooked==TRUE){ ecRY,MN  
  nHookCount=0; #{BHH;J+  
  hHook=NULL; QwSYjR:K  
 } shAoib?Kw:  
 return unhooked; iYk4=l  
} 2/W5E-tn  
FbWcq_  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) JgmX=6N  
{ ~DYv6-p%  
 BOOL bAdded=FALSE; .h7`Q{  
 for(int index=0;index<MAX_KEY;index++){ Z/f%$~Ch  
  if(hCallWnd[index]==0){ <+mYC'p  
   hCallWnd[index]=hWnd; _sGmkJi]  
   HotKey[index]=cKey; ,p\:Z3{ZH  
   HotKeyMask[index]=cMask; Adma~]T9  
   bAdded=TRUE; L" GQ Q  
   KeyCount++; =W_Pph  
   break; (Iz$_(  
  } =h Lw 1~  
 } +-*Ww5Zti  
 return bAdded; Jb (CH4|7  
} !RD<"  
3\B 28m  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Y%1 94fY$  
{ -0>gq$/N=^  
 BOOL bRemoved=FALSE; +338z<'Z!  
 for(int index=0;index<MAX_KEY;index++){ 4{rqGC /  
  if(hCallWnd[index]==hWnd){ !F|#TETrt  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7B)m/%>3s  
    hCallWnd[index]=NULL; 1z5Oi u  
    HotKey[index]=0; ;#Y'SK  
    HotKeyMask[index]=0; ?;0w1  
    bRemoved=TRUE; 7a_tT;f;  
    KeyCount--; j LS<S_`  
    break; nR(v~_y[V  
   } P\lEfsuR  
  } T{:~v+I=  
 } $"P[nNW3  
 return bRemoved; DQ*T2*L  
} .;$Ub[  
kR,ry:J-  
void VerifyWindow() }83a^E9L  
{ "-T[D9(A  
 for(int i=0;i<MAX_KEY;i++){ G=ly .  
  if(hCallWnd!=NULL){ =G,wR'M  
   if(!IsWindow(hCallWnd)){ !K[UJQ s\  
    hCallWnd=NULL; fFYfb4o  
    HotKey=0; "!w#E6gU  
    HotKeyMask=0; e"D%eFkDW  
    KeyCount--; BH"OphE  
   } h%%ryQQ&<  
  } J6[V7R[\  
 } {KGEv%  
} tSVWO] <  
uSgR|b;R]  
BOOL CHookApp::InitInstance() YstR T1  
{ (xdC'@&  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); JuKG#F#,  
 hins=AfxGetInstanceHandle(); |W#(+m  
 InitHotkey(); 6Lc{SR  
 return CWinApp::InitInstance(); yt@7l]I  
} _@5|r|P>  
vk0b b3){D  
int CHookApp::ExitInstance() |ns B'Q  
{ ,` 64t'g  
 VerifyWindow(); T@%\?=P  
 UnInit(); ?yc{@|  
 return CWinApp::ExitInstance(); S6CI+W  
} -^aJ}[uaI  
[o"<DP6w  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?:$\ t?e^  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) @=sM')f&  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 2<FEn$n[  
#if _MSC_VER > 1000 2z9s$tp  
#pragma once "P9(k>  
#endif // _MSC_VER > 1000 PS}'LhZ  
T!7B0_  
class CCaptureDlg : public CDialog )! eJW(  
{ AxtmG\o>  
 // Construction D){my_ /  
 public: 7 'q *(v  
  BOOL bTray; QdrZi.qKH  
  BOOL bRegistered; smUSR4VK  
  BOOL RegisterHotkey(); /rIyW?& f  
  UCHAR cKey; lQM&q  
  UCHAR cMask; sg8[TFX@Z  
  void DeleteIcon(); 85T"(HhT  
  void AddIcon(); yT~rql  
  UINT nCount; OUk"aAo  
  void SaveBmp(); -3K01p  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor \(A A|;  
  // Dialog Data (Z0_e&=*  
  //{{AFX_DATA(CCaptureDlg) ^B)f!HtU  
  enum { IDD = IDD_CAPTURE_DIALOG }; 'eo/"~/*w  
  CComboBox m_Key; ; ,}Dh/&E  
  BOOL m_bControl; Z%Fc -KVt  
  BOOL m_bAlt; 5%%e$o+  
  BOOL m_bShift; 4`B3Kt`o  
  CString m_Path; f DwK5?  
  CString m_Number; Zz1nXUZ  
  //}}AFX_DATA vSu dT  
  // ClassWizard generated virtual function overrides KdBpfPny@  
  //{{AFX_VIRTUAL(CCaptureDlg) apOa E7|  
 public: Kl,NL]]4*5  
  virtual BOOL PreTranslateMessage(MSG* pMsg); U`aB&[=$  
 protected: k2@]nW"S  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4{@{VsXN  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); BsU}HuQZQ  
  //}}AFX_VIRTUAL ,v<7O_A/e  
  // Implementation ]rG/?1'^i  
 protected: /9e?uC6  
  HICON m_hIcon; n$F~  
  // Generated message map functions ", p5}}/  
  //{{AFX_MSG(CCaptureDlg) o "6 2~  
  virtual BOOL OnInitDialog(); _U_O0@xi  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); B[I9<4}  
  afx_msg void OnPaint(); 84WX I#BH  
  afx_msg HCURSOR OnQueryDragIcon(); 5X f]j=_  
  virtual void OnCancel(); 1<Sg@  
  afx_msg void OnAbout(); %vv`Vx2  
  afx_msg void OnBrowse(); q3<kr<SP  
  afx_msg void OnChange(); AhD C5ue=  
 //}}AFX_MSG !E_Zh*lgm  
 DECLARE_MESSAGE_MAP() zak|* _  
}; =W &Mt  
#endif lm6hFvEZ  
o{6q>Jm  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file *s,[Uy![  
#include "stdafx.h" Cs_&BSs  
#include "Capture.h" @0 'U p  
#include "CaptureDlg.h" XC5/$3'M&  
#include <windowsx.h> 7o0zny3?  
#pragma comment(lib,"hook.lib") qi B~  
#ifdef _DEBUG wk ^7/B  
#define new DEBUG_NEW {fnx=BaG  
#undef THIS_FILE W|D kq  
static char THIS_FILE[] = __FILE__; m`l9d4p w?  
#endif FJDE48Vi  
#define IDM_SHELL WM_USER+1 <sw@P":F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \n t~K}a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )q[P&f(h  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; {9yf0n  
class CAboutDlg : public CDialog BY.k.]/  
{ V ^+p:nP  
 public: J*[@M*R;&  
  CAboutDlg(); f-G)pHm  
  // Dialog Data #R{>@]x`  
  //{{AFX_DATA(CAboutDlg) 3*& Y'/!  
  enum { IDD = IDD_ABOUTBOX }; 0:`|T jf_  
  //}}AFX_DATA KW(a@X  
  // ClassWizard generated virtual function overrides +i!5<nn  
  //{{AFX_VIRTUAL(CAboutDlg) wS);KLe3  
 protected: CVW T >M<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r|=1{N x  
  //}}AFX_VIRTUAL Jup)A`64  
  // Implementation ICb!AsL  
 protected: v,S5C  
  //{{AFX_MSG(CAboutDlg) &s='$a; 4  
  //}}AFX_MSG UWF \Vx*)b  
  DECLARE_MESSAGE_MAP() [Q0V5P~Q'  
}; v!8=B21  
t&xoi7!$  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 8 ECX[fw  
{ X3\PVsH$K  
 //{{AFX_DATA_INIT(CAboutDlg) !+Xul_XG  
 //}}AFX_DATA_INIT W;'fAohr  
} H; NV?CD  
FDQ=$w}' >  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) U\p`YZ  
{ Wk<fNHg  
 CDialog::DoDataExchange(pDX); u0h%4f!X  
 //{{AFX_DATA_MAP(CAboutDlg) Td'Mc-/  
 //}}AFX_DATA_MAP RbX9PF"|+  
} )"S%'myj  
I@MG ?ZQ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) uhh7Ft#H  
 //{{AFX_MSG_MAP(CAboutDlg) *qwN9b/!  
 // No message handlers Qz,2PO  
 //}}AFX_MSG_MAP c1"wS*u  
END_MESSAGE_MAP() &h0LWPl  
-;7xUNQ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) "_q~S$i^  
: CDialog(CCaptureDlg::IDD, pParent)  SvT0%2  
{ l!f_ +lv  
 //{{AFX_DATA_INIT(CCaptureDlg) Qds<j{2  
  m_bControl = FALSE; rXi&8R[  
  m_bAlt = FALSE; [zx|3wWAX-  
  m_bShift = FALSE; J5G<Y*q  
  m_Path = _T("c:\\"); &t[[4+Qt  
  m_Number = _T("0 picture captured."); ryVYY> *(K  
  nCount=0; :QGkYJ  
  bRegistered=FALSE; [(heE  
  bTray=FALSE; =/Gd<qz3  
 //}}AFX_DATA_INIT *S ag  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 cuN9R G  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Z*m^K%qJ  
} 9j:]<?D,A  
@."K"i'Bl  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Z)s !p  
{ "[N2qJ}p  
 CDialog::DoDataExchange(pDX); +})QTFV  
 //{{AFX_DATA_MAP(CCaptureDlg) ?4bYb]8Z  
  DDX_Control(pDX, IDC_KEY, m_Key); 2g= 6 s  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); rGP;0KtQ  
  DDX_Check(pDX, IDC_ALT, m_bAlt); G*I    
  DDX_Check(pDX, IDC_SHIFT, m_bShift); s<zN`&t  
  DDX_Text(pDX, IDC_PATH, m_Path); ,`}y J*7  
  DDX_Text(pDX, IDC_NUMBER, m_Number); pUHgjwT'U  
 //}}AFX_DATA_MAP "E\vdhk  
} ,~Mf2Y#m0p  
^%$IdDx  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9;+&}:IVS  
//{{AFX_MSG_MAP(CCaptureDlg) h$&Tg_/'#D  
 ON_WM_SYSCOMMAND() CP J21^  
 ON_WM_PAINT() ;k!.ey $S  
 ON_WM_QUERYDRAGICON() uO]D=Z\S(  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ~#E&E%sJ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) zR<{z  
 ON_BN_CLICKED(ID_CHANGE, OnChange) )#m{"rk[x,  
//}}AFX_MSG_MAP ,<U= 7<NU  
END_MESSAGE_MAP() 98Vv K?  
p(n0(}eVC'  
BOOL CCaptureDlg::OnInitDialog() f)*?Ji|5F  
{ vwT1bw.  
 CDialog::OnInitDialog(); J@2jx4   
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);  Zi~.  
 ASSERT(IDM_ABOUTBOX < 0xF000); ESCN/ocV  
 CMenu* pSysMenu = GetSystemMenu(FALSE); [c3!xHt5O  
 if (pSysMenu != NULL) 3Y)&[aj  
 { }_nBegv  
  CString strAboutMenu; rRRh-%.RU  
  strAboutMenu.LoadString(IDS_ABOUTBOX); |Q /LC0?  
  if (!strAboutMenu.IsEmpty()) .b,\.0N  
  { JKZVd`fF  
   pSysMenu->AppendMenu(MF_SEPARATOR); G`!,>n 3  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); a51(ySC}<s  
  } ;\7`G!q  
 } I6^y` 2X  
 SetIcon(m_hIcon, TRUE); // Set big icon k*C69  
 SetIcon(m_hIcon, FALSE); // Set small icon l$gJ^Wf2gY  
 m_Key.SetCurSel(0); A;;#]]48  
 RegisterHotkey(); @} r*KF-  
 CMenu* pMenu=GetSystemMenu(FALSE); nX (bVT4i  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Z?+ )ox  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ,7B7X)m{3  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); P8YnKyI,.  
 return TRUE; // return TRUE unless you set the focus to a control LA6XTgcu  
} Yh1</C  
6]1RxrAV  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) L ci?  
{ -dM~3'  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) B&_:20^y~  
 { \^(#b,k#  
  CAboutDlg dlgAbout; }rJqMZ]w  
  dlgAbout.DoModal(); E!Q@AZ  
 } BbX$R`f  
 else -9om,U`t  
 { Tv|'6P  
  CDialog::OnSysCommand(nID, lParam); MGF !ZZ\  
 } JPDxzp  
} lf( +]k30  
wrkw,H  
void CCaptureDlg::OnPaint() &u:U"j  
{ spA|[\Nl  
 if (IsIconic()) 96\FJHt Z  
 { cIO/8D#zU  
  CPaintDC dc(this); // device context for painting }@bp v  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); %g7j7$c  
  // Center icon in client rectangle 16Qu{K  
  int cxIcon = GetSystemMetrics(SM_CXICON); )j8'6tk)Z  
  int cyIcon = GetSystemMetrics(SM_CYICON); N6[Z*5efR  
  CRect rect; 'gN[LERT  
  GetClientRect(&rect); tV=Qt[|@  
  int x = (rect.Width() - cxIcon + 1) / 2; ?*~ ~Ok  
  int y = (rect.Height() - cyIcon + 1) / 2; [\ku,yd%0  
  // Draw the icon $(62j0mS>  
  dc.DrawIcon(x, y, m_hIcon); pss')YP.  
 } UT@Qo}:  
 else L[zTT\a  
 { >(2;(TbQm0  
  CDialog::OnPaint(); q}_8iDO6  
 } OkRb3}  
} 2po8n _  
<\~@l^lU  
HCURSOR CCaptureDlg::OnQueryDragIcon() +IXr4M&3  
{ Ls2,+yo]>  
 return (HCURSOR) m_hIcon; Idu'+O4  
} eV_ ",W  
MTwzL<@$  
void CCaptureDlg::OnCancel() b|87=1^m[  
{ 9+(b7L   
 if(bTray) %{ U (y#  
  DeleteIcon(); @^0}wk  
  CDialog::OnCancel(); !v3d:n\W8  
} &v]xYb)+<  
6<z#*`U1  
void CCaptureDlg::OnAbout() =&g:dX|q8  
{ @[D5{v)S  
 CAboutDlg dlg; +sx(q@  
 dlg.DoModal(); ZW))Mx#K=T  
} E7$ aT^  
GfgHFv  
void CCaptureDlg::OnBrowse() &x (D%+  
{ k7JC~D E#  
 CString str; "S@]yL  
 BROWSEINFO bi; + $M<ck?Bo  
 char name[MAX_PATH]; XFFm 'W6@  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); +v%+E{F$+  
 bi.hwndOwner=GetSafeHwnd(); .5HD i-  
 bi.pszDisplayName=name; Zp/P/97p  
 bi.lpszTitle="Select folder"; l/?bXNt  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Zc";R!At  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Nl4uQ_"  
 if(idl==NULL) .D7Gog3^<  
  return;  2X`t&zg  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 7yG%E  
 str.ReleaseBuffer(); rXSw@pqZ&  
 m_Path=str; W<#Kam:8e  
 if(str.GetAt(str.GetLength()-1)!='\\') 9a:(ab'  
  m_Path+="\\"; C^?/9\  
 UpdateData(FALSE); 2x gk$E$7  
} `MT.<5H  
P{RGW.Ci@  
void CCaptureDlg::SaveBmp() k(`>(w  
{ e0C_ NFS+  
 CDC dc; VaonG]Ues  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;Zf7|i`R3  
 CBitmap bm; {DVMs|5;^  
 int Width=GetSystemMetrics(SM_CXSCREEN); 5/hgWG6.t  
 int Height=GetSystemMetrics(SM_CYSCREEN); ga'G)d3oS  
 bm.CreateCompatibleBitmap(&dc,Width,Height); {#=o4~u%;H  
 CDC tdc; .Z`xNp  
 tdc.CreateCompatibleDC(&dc); U4"&T,'lTL  
 CBitmap*pOld=tdc.SelectObject(&bm); )REegFN@  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 55b/giX  
 tdc.SelectObject(pOld); ;Gu(Yoa}y  
 BITMAP btm; "MPS&OK  
 bm.GetBitmap(&btm); = g%<xCp  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 8&hxU@T~  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); rZAP3)dA  
 BITMAPINFOHEADER bih; 9G1ZW=83  
 bih.biBitCount=btm.bmBitsPixel; P(\x. d:  
 bih.biClrImportant=0; '0Q/oU  
 bih.biClrUsed=0; F.Bij8\  
 bih.biCompression=0; }L`Z<h*H  
 bih.biHeight=btm.bmHeight; 6EY 0Fjsi  
 bih.biPlanes=1; >y!R}`&0^t  
 bih.biSize=sizeof(BITMAPINFOHEADER); 'K23oQwDB  
 bih.biSizeImage=size; k/U rz*O  
 bih.biWidth=btm.bmWidth; FrRUAoF O  
 bih.biXPelsPerMeter=0; A(XX2f!i  
 bih.biYPelsPerMeter=0; }Oe4wEYN)  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); -g"Wi@Qr  
 static int filecount=0; >N0L  
 CString name; oh:.iL}j  
 name.Format("pict%04d.bmp",filecount++); Nbf >Y  
 name=m_Path+name; ( s+}l?  
 BITMAPFILEHEADER bfh; fDXTedrG/  
 bfh.bfReserved1=bfh.bfReserved2=0; e ?Jgk$"  
 bfh.bfType=((WORD)('M'<< 8)|'B'); d_[ zt)  
 bfh.bfSize=54+size; &?j\=%  
 bfh.bfOffBits=54; M?m@o1\;W  
 CFile bf; uowdzJ7  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1yS: `  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); '^Q$:P{G?  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); /*6[Itm_h  
  bf.WriteHuge(lpData,size); L8pKVr  
  bf.Close(); ihct~y-9W  
  nCount++; ?5[$d{ Gjl  
 } nGDY::nUE  
 GlobalFreePtr(lpData); M"Y ,kA|+  
 if(nCount==1) =Q# (2  
  m_Number.Format("%d picture captured.",nCount); V_4=0(  
 else MHCwjo"  
  m_Number.Format("%d pictures captured.",nCount); CQ{pv3)  
  UpdateData(FALSE); /BS yanro  
} M3fTU CR  
Q}^qu6  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) I 'ha=PeVn  
{ =+VDb5= TV  
 if(pMsg -> message == WM_KEYDOWN) msq2/sS~  
 { :@Ml-ZE  
  if(pMsg -> wParam == VK_ESCAPE) JGYJ;j{E]  
   return TRUE; gP ^A  
  if(pMsg -> wParam == VK_RETURN) I!Fd~g9I4  
   return TRUE; 2H1?f|0>  
 } `Gg,oCQg  
 return CDialog::PreTranslateMessage(pMsg); 5p7i9"tgn  
} Q ~eh_>"  
RRpCWc Iv"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) yx<-M  
{ 4^^=^c  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Gg^gK*D  
  SaveBmp(); pe!"!xJE  
  return FALSE; R$2\Xl@qQF  
} i66/2BUh.  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `@&WELFv{  
 CMenu pop; GCrsf  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); F_iZ|B  
 CMenu*pMenu=pop.GetSubMenu(0); %YG[?"P'  
 pMenu->SetDefaultItem(ID_EXITICON); N.V5>2  
 CPoint pt; $%1oZ{&M  
 GetCursorPos(&pt); T'5MO\  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +^$E)Ol  
 if(id==ID_EXITICON) BWkTQd<t  
  DeleteIcon(); z|<?=c2P  
 else if(id==ID_EXIT) ^_=bssaOd  
  OnCancel(); Q^'xVS_.  
 return FALSE; Om8Sgy?  
} 3[R[ `l]v?  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); m&- -$sr  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) qjN*oM,  
 AddIcon(); ;YrmT9Jx6  
 return res; fKkS_c 2  
} 9$ixjkIg  
F>k/;@d  
void CCaptureDlg::AddIcon() =_$Hn>vO  
{ 4@jX{{^6%  
 NOTIFYICONDATA data; Upc_"mkI.  
 data.cbSize=sizeof(NOTIFYICONDATA); &8JK^zQq  
 CString tip; : TP\pH7E  
 tip.LoadString(IDS_ICONTIP); `cFNO:  
 data.hIcon=GetIcon(0); g9F?j  
 data.hWnd=GetSafeHwnd(); iG{xDj{CKv  
 strcpy(data.szTip,tip); #a 4X*X.8c  
 data.uCallbackMessage=IDM_SHELL; FD8d-G  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; gS!zaD7Nr  
 data.uID=98; QRdh2YH`  
 Shell_NotifyIcon(NIM_ADD,&data); P\$%p-G  
 ShowWindow(SW_HIDE); \ Ju7.3.  
 bTray=TRUE; PSU}fo  
} }4q1"iMlO  
N3\vd_D(  
void CCaptureDlg::DeleteIcon() T=[ /x=  
{ u y13SkW  
 NOTIFYICONDATA data; nR,QqIFFw  
 data.cbSize=sizeof(NOTIFYICONDATA); }Rq{9j,%  
 data.hWnd=GetSafeHwnd(); /kqa|=-`q  
 data.uID=98; xH>j  
 Shell_NotifyIcon(NIM_DELETE,&data); 4@9xq<<5  
 ShowWindow(SW_SHOW); eY`o=xN  
 SetForegroundWindow(); Hw,@oOh.  
 ShowWindow(SW_SHOWNORMAL); )D7/[zb^  
 bTray=FALSE; @lCyH(c%  
} %vRCs]  
9bUFxSH  
void CCaptureDlg::OnChange() +6(\7?  
{ 4mm>6w8NT  
 RegisterHotkey(); ufocj1IU  
} vSwRj<|CF  
;IR.6k$;  
BOOL CCaptureDlg::RegisterHotkey() ,b t j6hg  
{ xC 4L`\  
 UpdateData(); m(^nG_eX  
 UCHAR mask=0; 2I_~] X53[  
 UCHAR key=0; 3yLJWHO%W  
 if(m_bControl) U<6+2y P  
  mask|=4; 9[:TWvd  
 if(m_bAlt) #1p\\Av  
  mask|=2; wAc;{60s]  
 if(m_bShift) bg^ <e}{<H  
  mask|=1; z6 .^a-sU5  
  key=Key_Table[m_Key.GetCurSel()]; m-<m[49  
 if(bRegistered){ 5Rae?* XH  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); yVyh\u\  
  bRegistered=FALSE; pL ,l  
 } yKC1h`2  
 cMask=mask; 1H8/b D  
 cKey=key; Q6xA@"GJ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); j7J'd?l  
 return bRegistered; nPUD6<bF  
} #cqI0ny?G  
I M G^L  
  四、小结 U.N?cKv  
mTLJajE/  
  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:
3+5=?,请输入中文答案:八 正确答案:八