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:
tn5%zJ#+
]3O&8, 一、实现方法
/*qRbN r tuaU=U 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:
y(J~:"}7) ^/"}_bR #pragma data_seg("shareddata")
nqo{]fn HHOOK hHook =NULL; //钩子句柄
Op%OQ14$ UINT nHookCount =0; //挂接的程序数目
xJCxzJ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
:*}Q/]N static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
=x8[%+ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
61S;M8tNv static int KeyCount =0;
Y"mFUW4 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Keh=>K)T #pragma data_seg()
>5-1?vi kEDpF26! 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。
duG3-E (bb!VVA 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:
*]]Zpa6 E{orezP BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
'dKfXYY1`N cKey,UCHAR cMask)
+l7)7qKx {
l(Rn=? BOOL bAdded=FALSE;
uyWheR for(int index=0;index<MAX_KEY;index++){
b(0<,r8 if(hCallWnd[index]==0){
Uj(0M;#%o+ hCallWnd[index]=hWnd;
62sl6WWS3 HotKey[index]=cKey;
j}^w:W76 HotKeyMask[index]=cMask;
AM}2=Ip bAdded=TRUE;
;ek*2Lh KeyCount++;
Y:!L break;
KoERg&fY }
(Mk7"FC7 }
gHe:o` return bAdded;
\V>5)Rn }
N{v)pu. //删除热键
=LaEEL BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Ek L2nI {
u_k[<&$ BOOL bRemoved=FALSE;
iJzBd7 for(int index=0;index<MAX_KEY;index++){
WWunS|B! if(hCallWnd[index]==hWnd){
`dZ|Ko%k if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
.TGw+E1k hCallWnd[index]=NULL;
(DiduSJ HotKey[index]=0;
?@'&<o0p# HotKeyMask[index]=0;
aD: #AmbJ bRemoved=TRUE;
>&(#p@# KeyCount--;
)pHtsd. eP break;
1{a%V$S[ }
VRd7H.f,A6 }
IbI0".o }
GKt."[seV return bRemoved;
36=aahXd\ }
(GC]= ;xwcK-A @ZJL]TO DLL中的钩子函数如下:
Xq 135/d &D<R;>iI LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
lbHgxZ {
I\mF dE BOOL bProcessed=FALSE;
4m0^
N if(HC_ACTION==nCode)
5NhFjPETr {
?h}NL5a if((lParam&0xc0000000)==0xc0000000){// 有键松开
RIMSXue*Ha switch(wParam)
F rckA {
^QS`H@+Z case VK_MENU:
l)NkTZ<] MaskBits&=~ALTBIT;
+M-tYE
5n break;
`\UY5n72 case VK_CONTROL:
&e^;;<*w MaskBits&=~CTRLBIT;
zZ%[SW&vC break;
tj13!Cc}e` case VK_SHIFT:
0ID9=:J MaskBits&=~SHIFTBIT;
Z*k(Q5&U break;
k'o[iKlu default: //judge the key and send message
(ghI$oH break;
Lwl1ta- }
-EiTP:A for(int index=0;index<MAX_KEY;index++){
Rl ]x: if(hCallWnd[index]==NULL)
IJ Jp5[w continue;
E{\CE1* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$lxpwO {
gC1LQ!:;Oi SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
k6bct@7 bProcessed=TRUE;
AT&K> NG }
~Zr}QO}G }
O*~,L6# } }
&ksuk9M else if((lParam&0xc000ffff)==1){ //有键按下
Pe@#6N` switch(wParam)
Y9^l|,bm5 {
kE:[6reG case VK_MENU:
a}yb~:TC MaskBits|=ALTBIT;
16L YVvmW break;
O(-p
md, case VK_CONTROL:
le/j! MaskBits|=CTRLBIT;
ve
d]X! break;
Q a (Sb case VK_SHIFT:
+?*;#=q MaskBits|=SHIFTBIT;
'ZF6 Z9 break;
KL_/f default: //judge the key and send message
!yd B,S break;
d0>U-. }
c e;7 for(int index=0;index<MAX_KEY;index++){
HP8J\` if(hCallWnd[index]==NULL)
r
XJx~
g continue;
_KM?
?& if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}B-$} {
lUu0AZQmG SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
QD@O!};
T bProcessed=TRUE;
?\Z pVL<> }
w
% Hj' }
M@.l#
[@U }
lx+;<la if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
H,%bKl# for(int index=0;index<MAX_KEY;index++){
;oOTL'Vu if(hCallWnd[index]==NULL)
4t[7lL`Z continue;
<odi>!ViH if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
"KIY+7@S} SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
JK!(\Ae. //lParam的意义可看MSDN中WM_KEYDOWN部分
_WZx].|A= }
g7zl5^o3j }
$]DuO1H./ }
6\7c: return CallNextHookEx( hHook, nCode, wParam, lParam );
MZt#T+b }
UVw^t+n 3;v)f": [ 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
)E.AY }+!"mJx@ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
v[
iJ(C_ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
HgY@M |?88EG@05 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
tNY;wl:wp XY'=_5t LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
1?.CXqK {
O<$w-( if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
d ~M; {
0T`Qoo>u //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
4FaO+Eo,8 SaveBmp();
Z|_V ;*
return FALSE;
#f#6u2nF\ }
3
`_/h' ~ …… //其它处理及默认处理
Xe);LhDC }
Y~}MfRE3z %r[`HF> No7-fX1B 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。
;{I9S' @}q, ';H7 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。
g@'XmT="_ }`w(sec:3 二、编程步骤
|m-N5$\IC *y4g\#o. 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";
nuq@m0t\# I2/am8!u% 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
$[X][[ I7U/={[J 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
3P0z$jh"H \aJ>? 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;
Pn9". Vo"G@W)lZ 5、 添加代码,编译运行程序。
"e-Y?_S7R8 .JKH=?~\ 三、程序代码
Tt~4'{Bc yP]>eLTSd ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
/H<{p$Wd #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
HAH\#WE #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
*<^C0:i( #if _MSC_VER > 1000
b]u=Iza #pragma once
r%;|gIky #endif // _MSC_VER > 1000
Y7S1^'E
3 #ifndef __AFXWIN_H__
dz@+ jEV #error include 'stdafx.h' before including this file for PCH
nq_$!aB_K #endif
9fX0?POG #include "resource.h" // main symbols
5mAb9F8@ class CHookApp : public CWinApp
+k6`
tl~* {
C
O6}D public:
4S42h_9 CHookApp();
$'\kK,= // Overrides
3rRIrrYO // ClassWizard generated virtual function overrides
m@<,bZkl //{{AFX_VIRTUAL(CHookApp)
uRy}HLZ" public:
G+=Gc(J virtual BOOL InitInstance();
bg|$1ue virtual int ExitInstance();
j*QdD\) //}}AFX_VIRTUAL
S5JMt;O //{{AFX_MSG(CHookApp)
)L&y@dy) // NOTE - the ClassWizard will add and remove member functions here.
w
yxPvI` // DO NOT EDIT what you see in these blocks of generated code !
|r+ x/,2- //}}AFX_MSG
4]1/{</B| DECLARE_MESSAGE_MAP()
6?,qysm06 };
xtGit} LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
J;>;K6pW BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
q!W,2xqZoq BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
gbMA-r:IC BOOL InitHotkey();
Vn_&q6Pa BOOL UnInit();
?J$k
5; #endif
#_ulmB; T4W20dxL7 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
6OE
xAn8 #include "stdafx.h"
CY?J$sN #include "hook.h"
% (h6m${j #include <windowsx.h>
:'r*
5EX #ifdef _DEBUG
|gV~U~A] #define new DEBUG_NEW
i?B<&'G #undef THIS_FILE
T
?Om]:j static char THIS_FILE[] = __FILE__;
7s%D(;W_Mo #endif
3z0Bg #define MAX_KEY 100
\2u7>fU! #define CTRLBIT 0x04
9z4F/tUq #define ALTBIT 0x02
Pac ^=|h<q #define SHIFTBIT 0x01
h HHR]e5: #pragma data_seg("shareddata")
\X
%#-y HHOOK hHook =NULL;
"L5w]6C4 UINT nHookCount =0;
r Hq1%)B static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
$l)RMP} static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
[DpOI static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
C+\z$/q static int KeyCount =0;
MY{Kq;FvRP static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
"`K_5"F #pragma data_seg()
#reR<qp&] HINSTANCE hins;
n$ByTmKxv void VerifyWindow();
=9,mt
K~ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
]+G\1SN~ //{{AFX_MSG_MAP(CHookApp)
tV4yBe<`` // NOTE - the ClassWizard will add and remove mapping macros here.
dZ"}wKbO // DO NOT EDIT what you see in these blocks of generated code!
1]>JMh%X9t //}}AFX_MSG_MAP
_9D]1f=& END_MESSAGE_MAP()
e3n^$'/\r &LM@xt4"^[ CHookApp::CHookApp()
\ MuKS4 {
#HL$`&m // TODO: add construction code here,
0qR#o/~I // Place all significant initialization in InitInstance
W+u@UJi }
{31X eAO@B CHookApp theApp;
G>^= Bm_$ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
qh bagw~ {
.\H-?6R^ BOOL bProcessed=FALSE;
C=;}7g if(HC_ACTION==nCode)
yq, qS0Fo {
"LYhYkI if((lParam&0xc0000000)==0xc0000000){// Key up
0Runex[ switch(wParam)
HziQ%QR {
V(!-xu1, case VK_MENU:
K"=I,Vr: MaskBits&=~ALTBIT;
`Yo!sgPO\ break;
ftqeiZ
2 case VK_CONTROL:
/s`8=+\9 MaskBits&=~CTRLBIT;
O&PrO+& break;
N9AM% H$7 case VK_SHIFT:
LeXkl=CC MaskBits&=~SHIFTBIT;
)WF*fcx{ break;
";/,FUJJ default: //judge the key and send message
68a break;
:}~B;s0M\ }
R` >z>!) for(int index=0;index<MAX_KEY;index++){
`< cn if(hCallWnd[index]==NULL)
ujoJ6UOG continue;
g5hMZPOmP if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
I(0 *cWO {
/: }"Z b SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
E<4'4)FHuQ bProcessed=TRUE;
^U{SUWl }
\oV g(J&o }
y(Ck j" }
s% (|z else if((lParam&0xc000ffff)==1){ //Key down
&/]g@^h9 switch(wParam)
6nHyd<o {
jf~-;2 case VK_MENU:
P4 dhP-t MaskBits|=ALTBIT;
]c$)0O\O break;
C\5"Kb case VK_CONTROL:
H6%%n
X MaskBits|=CTRLBIT;
f-l(H="e break;
.KzU7 case VK_SHIFT:
)Vnqz
lI5 MaskBits|=SHIFTBIT;
?LA`v_ break;
T!Eyq,] default: //judge the key and send message
;UDd4@3`S" break;
Ny)N }
=?gDM[t^ for(int index=0;index<MAX_KEY;index++)
md`"zV {
72{Ce7J4 if(hCallWnd[index]==NULL)
vSG$2g= continue;
>]S-a-|Bp if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
8UN7(J {
ya0D50m SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
I<^&~== bProcessed=TRUE;
l5esx#([*R }
hV7]/z!d }
jK9#.
0 }
[5sa1$n96G if(!bProcessed){
F{"4cyoou for(int index=0;index<MAX_KEY;index++){
JUlCj#% if(hCallWnd[index]==NULL)
}D\i1/Y continue;
k86j&
.m_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
h;?H4j SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
P\2UIAPa\b }
nH7i)!cI~ }
AI\|8[kf0 }
-Ay=*c.4 return CallNextHookEx( hHook, nCode, wParam, lParam );
0mD=Rjb*a }
?kKr/f4N 1a>TJdoa BOOL InitHotkey()
UUaC@Rs2 {
Y$&+2w,)H, if(hHook!=NULL){
#Z>EX?VS: nHookCount++;
[/IN820t return TRUE;
sbV
{RSl }
U9eb&nd else
pZaOd;t hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
iX\]-_D if(hHook!=NULL)
b!3Y<D* nHookCount++;
%RX}sS return (hHook!=NULL);
0\2#(^ }
IMtfi(Y%F BOOL UnInit()
1<TB{}b
Z {
o1?bqVF;6 if(nHookCount>1){
)CM3vL { nHookCount--;
[OK( return TRUE;
VYC$Q;Z }
0` \!O(jJ BOOL unhooked = UnhookWindowsHookEx(hHook);
6< O|,7=_ if(unhooked==TRUE){
lZf=# nHookCount=0;
T\b-<Xle hHook=NULL;
.qGfLvx% }
gOL-b9W return unhooked;
|QcE5UC }
7;x}W-`iF %MH!L2| BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
CPt62j8 {
1b4/ BOOL bAdded=FALSE;
#9FY;~ for(int index=0;index<MAX_KEY;index++){
NUp,In_ if(hCallWnd[index]==0){
Cr#Z. hCallWnd[index]=hWnd;
i^2-PKPg{ HotKey[index]=cKey;
lPO+dm HotKeyMask[index]=cMask;
uEX+j bAdded=TRUE;
?&rt)/DV, KeyCount++;
M'-Z" break;
`_Fxb@"R }
z3l(4W P }
u/>+cT6} return bAdded;
"nQ&~KQ }
-jdhdh K 0Gm ?( BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~us1Df0bp {
sm9/sX! BOOL bRemoved=FALSE;
A4 for(int index=0;index<MAX_KEY;index++){
JNk6:j&Pf if(hCallWnd[index]==hWnd){
|(77ao3 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
odaCKhdk hCallWnd[index]=NULL;
aRE%(-5 HotKey[index]=0;
|Ta-D++]' HotKeyMask[index]=0;
9_ru*j\ bRemoved=TRUE;
N6UPD11}6 KeyCount--;
+pG[
[}/ break;
-lqsFaW }
B57MzIZi] }
[8v>jQ) }
TkyP_* return bRemoved;
ScCA8JgY }
yhG%@vSq QpI\\Zt6 void VerifyWindow()
@/f'i9?oM` {
-~=?g9fGm6 for(int i=0;i<MAX_KEY;i++){
o>i@2_r\&H if(hCallWnd
!=NULL){ ,:=g}i
if(!IsWindow(hCallWnd)){ 4];<`
%
hCallWnd=NULL; y)*W!]:7^>
HotKey=0; >_'0 s
HotKeyMask=0; e~P4>3
KeyCount--; Ouos f1
} Jk>!I\
} + J` Qv,0
} -,a@bF:
} [~{'"-3L0
_MLbJ
BOOL CHookApp::InitInstance() Bk2j|7
{ ,Z$!:U
AFX_MANAGE_STATE(AfxGetStaticModuleState()); )j\9IdkU;y
hins=AfxGetInstanceHandle(); .NSV%I
InitHotkey(); ,,=VF(@G
return CWinApp::InitInstance(); U+-R2w]#q_
} WG]`Sy
U%r|hn3
int CHookApp::ExitInstance() Iq@&?,W
{ f)1*%zg%
VerifyWindow(); 76(/(v.x
UnInit(); 9}A\BhtiM
return CWinApp::ExitInstance(); WJTc/
} Dp-j(F
;Z.sK-NJ4
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \OE,(9T2P.
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ac%x\e$
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 9Yhlq$;g
#if _MSC_VER > 1000 wK!7mZ
#pragma once LbUH`0:%t
#endif // _MSC_VER > 1000 fLg
:+Ue<B
h@CP
class CCaptureDlg : public CDialog $[0\Th
{ {J*|)-eAw
// Construction h{ T{3
public: ijACfl{!:t
BOOL bTray; nSpOTQ
BOOL bRegistered; e/b
|
sl
BOOL RegisterHotkey(); a"m-&mN
UCHAR cKey; sB0m^Y'
UCHAR cMask; w* \JA+
void DeleteIcon(); M'nzoRk
void AddIcon(); ^VsE2CX
UINT nCount; 1v inO!
void SaveBmp(); 8Om4G]*|,
CCaptureDlg(CWnd* pParent = NULL); // standard constructor "2ZuI;w
// Dialog Data a7sX*5t{R
//{{AFX_DATA(CCaptureDlg) } 8[
enum { IDD = IDD_CAPTURE_DIALOG }; &2r[4
CComboBox m_Key; {~`{bnx^]7
BOOL m_bControl; )Lg~2]'?j
BOOL m_bAlt; LcTTfb+<
BOOL m_bShift; ,z~"Mst
CString m_Path; *^:s!F
CString m_Number; K0|:+s@u
//}}AFX_DATA xoQ(GrBY
// ClassWizard generated virtual function overrides K=>j+a5$
//{{AFX_VIRTUAL(CCaptureDlg) q;.LK8M
public: w\a6ga!xt"
virtual BOOL PreTranslateMessage(MSG* pMsg); 63QF1*gPH
protected:
[IgqK5@
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support NInZ~4:
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); YB.@zL0.(
//}}AFX_VIRTUAL UAGh2?q2
// Implementation kAs=5_?I
protected: j>G|Xv
HICON m_hIcon; pGr4b:N
// Generated message map functions Y8c,+D,Ww
//{{AFX_MSG(CCaptureDlg) #'y&M t
virtual BOOL OnInitDialog(); "A0y&^4B@
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); dEkAUH
afx_msg void OnPaint(); 9\uBX.]x
afx_msg HCURSOR OnQueryDragIcon(); 3|%058bF
virtual void OnCancel(); qL5~Wr m-W
afx_msg void OnAbout(); TLq^5,qG
afx_msg void OnBrowse(); %CQv&d2
afx_msg void OnChange(); _k#GjAPM
//}}AFX_MSG rdsZ[ii
DECLARE_MESSAGE_MAP() 'EN80+xYX
}; n. vrq-
#endif Hc-up.?v'v
N*+WGsxl$z
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $xis4/2
#include "stdafx.h" YMVmpcz
#include "Capture.h" <sSH^J4QqX
#include "CaptureDlg.h" 7g:Lj,Z4L
#include <windowsx.h> Awr(}){
#pragma comment(lib,"hook.lib") *BvdL:t
#ifdef _DEBUG (\nEU! Y
#define new DEBUG_NEW /x<uv_"
#undef THIS_FILE FL b
static char THIS_FILE[] = __FILE__; ={51fr/C%
#endif v`S ;.iD
#define IDM_SHELL WM_USER+1 G cB<i
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6}~k4;'}A
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *=tA },`\7
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; egH,7f(yP
class CAboutDlg : public CDialog <$ qT(3w<y
{ I@IE0+ [n
public: O8Z+g{
CAboutDlg(); pH(X;OC9S
// Dialog Data vy`
lfbX@
//{{AFX_DATA(CAboutDlg) "H=N>=g0E
enum { IDD = IDD_ABOUTBOX }; g~U<0+&yw%
//}}AFX_DATA KpDb%j
// ClassWizard generated virtual function overrides *3s-=.U~
//{{AFX_VIRTUAL(CAboutDlg) VVcli*
protected: JJ'f\f9
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Y!+H9R
//}}AFX_VIRTUAL ;j
qF:Wl@
// Implementation nM *}VI
protected: M+%qVwp
//{{AFX_MSG(CAboutDlg) x U"g~hT
//}}AFX_MSG Pz\ByD
DECLARE_MESSAGE_MAP() 4iZg2"[D
}; CugZ!>;^
)&Z`SaoP|J
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) I8c:U2D
{ `\'V]9wS
//{{AFX_DATA_INIT(CAboutDlg) PHJHW#sv
//}}AFX_DATA_INIT C6Cr+TScH
} Ikw.L
d[ _@l
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 0g HV(L?
{ lr?SL\D
CDialog::DoDataExchange(pDX); 2R,8q0qR:
//{{AFX_DATA_MAP(CAboutDlg) X|D-[|P
//}}AFX_DATA_MAP ,*YmXR-"
} h<bhH=6~
~gHn>]S0
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) P 00%EB
//{{AFX_MSG_MAP(CAboutDlg) r^H,H'BohJ
// No message handlers /^v!B`A@
//}}AFX_MSG_MAP y#8 W1%{x
END_MESSAGE_MAP() i`W~-J
QcJC:sP\>
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) A&M(a
: CDialog(CCaptureDlg::IDD, pParent) Z1:<i*6>D
{ $F[+H Wf
//{{AFX_DATA_INIT(CCaptureDlg) 4O.R=c2}7>
m_bControl = FALSE; PgA1:i&'
m_bAlt = FALSE; 8aKS=(Z!j
m_bShift = FALSE; o7WAH@g
m_Path = _T("c:\\"); 8@LUL)"
m_Number = _T("0 picture captured."); 4jGN:*kZ
nCount=0; +@yU `
bRegistered=FALSE; oI'& &Bt
bTray=FALSE; Ab>Kf r#
//}}AFX_DATA_INIT ]mz '(t
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 qkz|r?R)
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); [h !i{QD
} X Q
CE`m
cB36w$n8
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) "K$c 9Z8
{ &[
],rT
CDialog::DoDataExchange(pDX); qL`yaU
//{{AFX_DATA_MAP(CCaptureDlg) ZI1*Cb
DDX_Control(pDX, IDC_KEY, m_Key); }fv7WhQ
DDX_Check(pDX, IDC_CONTROL, m_bControl); !uO@4]:Y
DDX_Check(pDX, IDC_ALT, m_bAlt); ~j(vGO3JB
DDX_Check(pDX, IDC_SHIFT, m_bShift); 87W!R<G
DDX_Text(pDX, IDC_PATH, m_Path); uqU&k@
DDX_Text(pDX, IDC_NUMBER, m_Number); yla-X|>
//}}AFX_DATA_MAP t_*x.{x-
}
`&h-+
e+F$fQt>
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) [\Nmm4
//{{AFX_MSG_MAP(CCaptureDlg) 4]$OO'
ON_WM_SYSCOMMAND() K=E+QvSG
ON_WM_PAINT() gat;Er
ON_WM_QUERYDRAGICON() VH<d[Mj
ON_BN_CLICKED(ID_ABOUT, OnAbout) WPAUY<6f
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;\6@s3
ON_BN_CLICKED(ID_CHANGE, OnChange) 60cQ3.e
//}}AFX_MSG_MAP f F)M'C
END_MESSAGE_MAP() N~fE&@-
ULBEe@s
BOOL CCaptureDlg::OnInitDialog() jT< I`K*
{ ?1c7wEk
CDialog::OnInitDialog();
;(J&%
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); '/t9#I@G\
ASSERT(IDM_ABOUTBOX < 0xF000); hdcB*j?4
CMenu* pSysMenu = GetSystemMenu(FALSE); c
q[nqjC=
if (pSysMenu != NULL) -Eig#]Se3
{ =:xX~,qmv
CString strAboutMenu; UNwjx7usD
strAboutMenu.LoadString(IDS_ABOUTBOX); BDzAmrO<
if (!strAboutMenu.IsEmpty()) =S\^j"
{ Tx]p4wY:D
pSysMenu->AppendMenu(MF_SEPARATOR); ;|Hpg_~%>
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 8y
} *o\AP([@
} 9S[.ESI{>
SetIcon(m_hIcon, TRUE); // Set big icon kB=B?V~#
SetIcon(m_hIcon, FALSE); // Set small icon C22h*QM*
m_Key.SetCurSel(0); &4sz:y4T>
RegisterHotkey(); e`H>}O/ai
CMenu* pMenu=GetSystemMenu(FALSE); O[eU{;P
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 0Zp5y@V8
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); US3)+6
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9I2&Vx=DSt
return TRUE; // return TRUE unless you set the focus to a control 0#Pa;(
} .VNz(s
,
V,Q(!$F
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) TBQ68o
{ D`!BjhlW
if ((nID & 0xFFF0) == IDM_ABOUTBOX) q_`j-!
{
!bCL/[
CAboutDlg dlgAbout; ` OgT"FdL!
dlgAbout.DoModal();
<#57q%
} K(lSR
else OcPgw/
I
{ H!hd0.
CDialog::OnSysCommand(nID, lParam); t 4zUj%F
} {r$Ewc$Yb7
} 1a V32oK
iGz*4^%
void CCaptureDlg::OnPaint() E>i<2
{ FG{,l=Z0
if (IsIconic()) x V`l6QS
{ 4 qY
CPaintDC dc(this); // device context for painting !G\gqkSL
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); zLJmHb{(
// Center icon in client rectangle Zi7cp6~7
int cxIcon = GetSystemMetrics(SM_CXICON); OIpT9
int cyIcon = GetSystemMetrics(SM_CYICON); \'[tfSB
CRect rect; Ii5U)"
GetClientRect(&rect);
!sEhjJV^7
int x = (rect.Width() - cxIcon + 1) / 2; dlCiqY:}
int y = (rect.Height() - cyIcon + 1) / 2; D29Lu(f
// Draw the icon 8Dtpb7\o
dc.DrawIcon(x, y, m_hIcon); (n:A`]
} _'1 ]CoR
else 9ZU^([@D
{ f=Pn,.>tIz
CDialog::OnPaint(); _deEs5i
} /SS~IhUX
} J?X{NARt
fe`_0lxj
HCURSOR CCaptureDlg::OnQueryDragIcon() _[rQt8zn
{ U{Oo@ztT
return (HCURSOR) m_hIcon; v=hn# U
} $ (xdF
_->+Hjj ^
void CCaptureDlg::OnCancel() c/^jD5U7
{ $RRX-
if(bTray) }N(gP_?n
DeleteIcon(); %Cqp88]
CDialog::OnCancel(); m%[/w wL
} AkW>*x
BY[7`@
void CCaptureDlg::OnAbout() t2OBVzK
{ na8`V`77
CAboutDlg dlg; IzUpkwN
dlg.DoModal(); z80FMulO
} +[MHl
i/'bpGrQ(
void CCaptureDlg::OnBrowse() &g5PPQ18
{ !
}e75=x
CString str; 9_jiUZFje
BROWSEINFO bi; M&29J
char name[MAX_PATH]; o3|4PAA/
ZeroMemory(&bi,sizeof(BROWSEINFO)); PH:5
bi.hwndOwner=GetSafeHwnd(); na~ FT[3C
bi.pszDisplayName=name; Me?I8:/
bi.lpszTitle="Select folder"; k[D,du')
bi.ulFlags=BIF_RETURNONLYFSDIRS; jVN06,3z
LPITEMIDLIST idl=SHBrowseForFolder(&bi); NQ[X=a8N
if(idl==NULL) F<6(Hw#>
return; G'}N ?8s1
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :7"Q
str.ReleaseBuffer(); .*9u_2<
m_Path=str; un~`|
if(str.GetAt(str.GetLength()-1)!='\\') l=l$9H,
m_Path+="\\"; )$i,e`T
UpdateData(FALSE); ^t7u4w!
} ys`oHSf
;ZAwf0~
void CCaptureDlg::SaveBmp() ovM;6o
{ Haktr2I
CDC dc; 9{Et v w
dc.CreateDC("DISPLAY",NULL,NULL,NULL); R_+:nCB@,
CBitmap bm; \ HUDZ2 s
int Width=GetSystemMetrics(SM_CXSCREEN); M@h"FuX:
int Height=GetSystemMetrics(SM_CYSCREEN); f"j9C%'*
bm.CreateCompatibleBitmap(&dc,Width,Height); =Hd#"9-
CDC tdc; 'fb\t,
tdc.CreateCompatibleDC(&dc); T"za|Fo
CBitmap*pOld=tdc.SelectObject(&bm); X-<,zRM
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); &QfEDDJ
tdc.SelectObject(pOld); fvH{va.
BITMAP btm; Y %bb-|\W
bm.GetBitmap(&btm); cf"&22TQ+Z
DWORD size=btm.bmWidthBytes*btm.bmHeight; [Z:P{yr
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); u1y>7,Z6W
BITMAPINFOHEADER bih; 5rck]L'
bih.biBitCount=btm.bmBitsPixel; GeY!f/yQ<
bih.biClrImportant=0; _^(1Qb[
bih.biClrUsed=0; FA{Q6fi:2
bih.biCompression=0; 2>k*9kyp
bih.biHeight=btm.bmHeight; =gJ{75tV3
bih.biPlanes=1; fu~iF
bih.biSize=sizeof(BITMAPINFOHEADER); )mwwceN
bih.biSizeImage=size; wH@S$WT
bih.biWidth=btm.bmWidth; 71AYDO
bih.biXPelsPerMeter=0; 7~Inxk;
bih.biYPelsPerMeter=0; <^5$))r
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); %regt{
static int filecount=0; zo"L9&Hzo
CString name; )b]wpEFl
name.Format("pict%04d.bmp",filecount++); 3$YbEl@#
name=m_Path+name; DDGDj)=`
BITMAPFILEHEADER bfh; y_n4Y[4g
bfh.bfReserved1=bfh.bfReserved2=0; )=K8mt0qob
bfh.bfType=((WORD)('M'<< 8)|'B'); EFVZAY"+!;
bfh.bfSize=54+size; K O\HH
bfh.bfOffBits=54; }ixCbuD
CFile bf; ?K2EK'-q
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){
qCrpc=
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ai?J
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); z;9D[ME#1
bf.WriteHuge(lpData,size); l%mp49<
bf.Close(); NV/paoyx:*
nCount++; Gchs$^1`t
} V1d#7rP
GlobalFreePtr(lpData); Q~wS2f`)
if(nCount==1) [c1Gq)ht
m_Number.Format("%d picture captured.",nCount); <h#W*a
else tF/Ni*\^rV
m_Number.Format("%d pictures captured.",nCount); = )3\B
UpdateData(FALSE); .K4)#oC
} 7@gH{p1
nPI$<yW7F
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) F?a
63,r
{ 7\g#'#K
if(pMsg -> message == WM_KEYDOWN) eA]8M^
{ xWY\,'+Q
if(pMsg -> wParam == VK_ESCAPE) yLCMu | +
return TRUE;
MYVVI1A
if(pMsg -> wParam == VK_RETURN) +\ "NPK@3
return TRUE; @ls/3`E/5E
} 9\Ff z&
return CDialog::PreTranslateMessage(pMsg); .6rbn8h
} s1[.L~;J
:!CnGKgt
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) IOxtuR
{ _0^>^he
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ g&w~eWpk
SaveBmp(); lcpiCZ
return FALSE; K^"l.V#J
} ;q%z\gA
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ l0t(t*[Mj
CMenu pop; SnUR?k1
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); L;?h)8
CMenu*pMenu=pop.GetSubMenu(0); ]57Ef'N
pMenu->SetDefaultItem(ID_EXITICON); w1zMY:9
CPoint pt; Ug0c0z!b
GetCursorPos(&pt); vY.VFEP/
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?771e:>S-
if(id==ID_EXITICON) (4q/LuP^d
DeleteIcon(); 1D[>oK\
else if(id==ID_EXIT) J_yXL7d
OnCancel(); pd,d"+
return FALSE; Hq>hnCT
} (#85<|z
LRESULT res= CDialog::WindowProc(message, wParam, lParam); /!>OWh*~
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) RRQv<x
AddIcon(); M?P\ YAn$
return res; +zDRed_]=_
} ^gyI-S(;
=5^1Bl
void CCaptureDlg::AddIcon() oXk6,b"
{ F3o"ETle
NOTIFYICONDATA data; qG~6YCqii
data.cbSize=sizeof(NOTIFYICONDATA); S"^'ksL\
CString tip;
}#&[[}@th
tip.LoadString(IDS_ICONTIP); }C["'tLX
data.hIcon=GetIcon(0); A{)pzV25
data.hWnd=GetSafeHwnd(); 6pC1C.
strcpy(data.szTip,tip); "8?Fl&=Q
data.uCallbackMessage=IDM_SHELL; L|s\IM1g
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; tZg)VJQys
data.uID=98; Hc|cA(9sh9
Shell_NotifyIcon(NIM_ADD,&data); u+6D|
ShowWindow(SW_HIDE);
(igB'S5wf
bTray=TRUE; 6'uCwAQU
} aEa+?6;D
!vK0|eV3
void CCaptureDlg::DeleteIcon() WLVkrTvX
{ qZV|}M>P)
NOTIFYICONDATA data; k}}'fA
data.cbSize=sizeof(NOTIFYICONDATA);
8sI$
data.hWnd=GetSafeHwnd(); N|"kuRN#
data.uID=98; !z2xm3s{]p
Shell_NotifyIcon(NIM_DELETE,&data); -j rAk
ShowWindow(SW_SHOW); pz/W#VN
SetForegroundWindow(); {<}Hut:a
ShowWindow(SW_SHOWNORMAL);
H4YA
bTray=FALSE; >X:!Y[N
} *h).V&::O
G^VOA4
void CCaptureDlg::OnChange() 6;!)^b
{ 8D? $@!-
RegisterHotkey(); L>7@!/9L
} 6r@>n_6LY
fTK84v"7_
BOOL CCaptureDlg::RegisterHotkey() W
9}xfy09
{ uz$p'Q
UpdateData(); {=gJGP/}_
UCHAR mask=0; {
JDD"z
UCHAR key=0; mZ:#d;0
if(m_bControl) 8~RJnwF^
mask|=4; 6<5:m:KE
if(m_bAlt) '+g[n
mask|=2; $XkO\6kh
if(m_bShift) +NvpYz
mask|=1; [^/a`Kda8
key=Key_Table[m_Key.GetCurSel()]; <_=O0 t|6
if(bRegistered){ S^EAE]
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ` ` Yk
bRegistered=FALSE; eq&QWxiD*
} @}{uibLD\
cMask=mask; .O#7X
cKey=key; w?N>3`Jnf
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ,PJC FQMR
return bRegistered; )4:]gx#cr
} +IjBeQ?
M ]O4
四、小结 Q uw|KL
Vwjic2lGI
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。