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:
'Y[A'.*}4
H\I!J@6g 一、实现方法
<M,H9^l3 b|dCEmFt 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:
Tj=dL u`pROd/ R5 #pragma data_seg("shareddata")
d_C4B HHOOK hHook =NULL; //钩子句柄
q{GSsDo-:V UINT nHookCount =0; //挂接的程序数目
>C3NtGvy static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
DvX3/z#T static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
U+;>S$ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
2Nn1-wdhb static int KeyCount =0;
D4q>R; static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
ChTXvkdH #pragma data_seg()
'yd@GQM& #jZ@l3 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。
^$IZLM?E~ ,k~j6Z 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:
Hl3)R*&'J lKEX"KQ! BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
ns#~}2"d cKey,UCHAR cMask)
NaA+/: {
5_)@B]~nM BOOL bAdded=FALSE;
s8_aL)@f for(int index=0;index<MAX_KEY;index++){
=dM.7$6) R if(hCallWnd[index]==0){
NQC3!=pQ}Y hCallWnd[index]=hWnd;
5#0e={X HotKey[index]=cKey;
"#twY|wW HotKeyMask[index]=cMask;
|qlS6Aln bAdded=TRUE;
MCeu0e^) KeyCount++;
#9`r XEz break;
f]8!DXEA }
2vc\= }
3@)obb return bAdded;
~XUOW Y75 }
/2e%s:")h //删除热键
YOV : BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
A XBkJ'jd {
+2DE/wE]e+ BOOL bRemoved=FALSE;
qO-C%p
[5 for(int index=0;index<MAX_KEY;index++){
*bA+]&dj\ if(hCallWnd[index]==hWnd){
x_==Ss if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
>5;N64]!) hCallWnd[index]=NULL;
P8wy*JvT HotKey[index]=0;
~uI**{ HotKeyMask[index]=0;
lq>pH5x bRemoved=TRUE;
$Z;B QJVH KeyCount--;
2{ o0@ break;
(*,8KLV_i }
p9-0?(] }
Q.,DZp }
$!G` D= return bRemoved;
bj@xqAGl }
HG2GZ}~^1 dv;9QCc' .^i<xY DLL中的钩子函数如下:
Y@Y`gF6F SLkuT`* LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
L[9OVD {
3AURzU BOOL bProcessed=FALSE;
^7u X$ if(HC_ACTION==nCode)
bV@7mmz:X+ {
cd!|Ne>fe if((lParam&0xc0000000)==0xc0000000){// 有键松开
RqXi1<6j# switch(wParam)
q]^,vei {
{XtoiI case VK_MENU:
o{V#f_o MaskBits&=~ALTBIT;
t5paYw-b break;
6xHi\L case VK_CONTROL:
a/~29gW8E\ MaskBits&=~CTRLBIT;
`<^*jB@P break;
]:&n-&@L case VK_SHIFT:
ivfXat- MaskBits&=~SHIFTBIT;
R4b-M0H break;
-#aZF2z default: //judge the key and send message
"9@,l! break;
@EHIp{0. }
:.$"kXm^
for(int index=0;index<MAX_KEY;index++){
/7gi/uh~-( if(hCallWnd[index]==NULL)
~:[!Uyp0b continue;
*69c-`o if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=_
y\Y@J
{
nUc;/ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
P16YS8$ bProcessed=TRUE;
_A 2Lv]vfV }
QR"bYQ }
KiAcA]0 }
QHzgy? else if((lParam&0xc000ffff)==1){ //有键按下
.:y5U}vR switch(wParam)
6tn+m54_ {
-[DWM2C$K4 case VK_MENU:
IU#x[P! MaskBits|=ALTBIT;
rbyY8
bX break;
r`6:Q&& case VK_CONTROL:
- $JO8'TP MaskBits|=CTRLBIT;
^Kqf~yS% break;
J}TfRrf case VK_SHIFT:
/0lC KU!= MaskBits|=SHIFTBIT;
_KN/@(+F break;
y-B=W]E default: //judge the key and send message
LA4<#KP break;
lY'N4x7n }
3c #s|qW for(int index=0;index<MAX_KEY;index++){
nt ,7u( if(hCallWnd[index]==NULL)
c%f_.MiU continue;
+E5=$` if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
r:&|vP {
uzBz}<M= SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
kl}Xmw{tJ bProcessed=TRUE;
,9of(T(~ }
*:hyY!x }
=X(%Svnp }
2e1]}wlK if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
WE6\dhJ< for(int index=0;index<MAX_KEY;index++){
OP! R[27> if(hCallWnd[index]==NULL)
o3N] `xD' continue;
vF4]ux&
if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
#X`8dnQZ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
bw4oLu? //lParam的意义可看MSDN中WM_KEYDOWN部分
d]wD[] }
Bv9kSu9'~ }
_P7tnXww }
U|@V
74 return CallNextHookEx( hHook, nCode, wParam, lParam );
"Fnq>iR- }
'Ot,H_pE 3
hKBc0 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,o&p,>|c )9v`f9X){ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
o[\HOe~; BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
},@^0UH4c c EnkU] 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$W|~ H [A2`]CE<@ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
=L-I-e97@ {
ZcE_f>KV if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
,!#ccv+Vm% {
%O[N}_XHEh //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
oG oK, SaveBmp();
,*svtw:2') return FALSE;
B 0ee?VC }
NjuiD]. …… //其它处理及默认处理
ZWUP^V }
=aG xg57 jXg ~x:DXEV, 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。
RFaSwf,5n UUe#{6Jx_ 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。
q2aYEuu, S>Yj@L 二、编程步骤
g"VMeW^ lSwcL 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";
o{:xp r=( <O<LYN+( 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
/ ~%KVe fV>CZ^=G 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;
&[vw 0N- ZP\M9Ja 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;
21X`h3+= /phX'xp 5、 添加代码,编译运行程序。
#6v27:XK LW6ZAETyL 三、程序代码
BaI $S>/Q ;*TIM%6# ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
p{A}pnjf #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
=ac_,]z #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
tC?=E#3V #if _MSC_VER > 1000
n:
ui #pragma once
N?Q+> #endif // _MSC_VER > 1000
yF}OfK?0f #ifndef __AFXWIN_H__
#p(h]T32 #error include 'stdafx.h' before including this file for PCH
Fxs;Fp #endif
;ea]$9 #include "resource.h" // main symbols
z;f2*F class CHookApp : public CWinApp
pIV-kI:w {
olB)p$aH# public:
&F:IIo7 CHookApp();
\*hrW( // Overrides
PX:'/{V // ClassWizard generated virtual function overrides
Ks^6.) //{{AFX_VIRTUAL(CHookApp)
v4,h&JLt public:
?lGG|9J\ virtual BOOL InitInstance();
F_iXd/ virtual int ExitInstance();
b
\KL;H/ //}}AFX_VIRTUAL
GE;e]Jkjn //{{AFX_MSG(CHookApp)
LsEXM- // NOTE - the ClassWizard will add and remove member functions here.
<#=N
m0S$ // DO NOT EDIT what you see in these blocks of generated code !
/@ !CKh` //}}AFX_MSG
x5`br.b DECLARE_MESSAGE_MAP()
|:[tNs*,O };
+CH},@j LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
g6@Fp7T BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
c .3ZXqpI; BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
,u }XWV BOOL InitHotkey();
oBQ#eW aY BOOL UnInit();
p^<yj0Y #endif
,[S+T.Cu y.5/?{GL //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
}VS3L_
;}/ #include "stdafx.h"
oF9
-& #include "hook.h"
4'j
sDcs #include <windowsx.h>
oVA?J%EK #ifdef _DEBUG
`g8E1-]l #define new DEBUG_NEW
geQ{EwO8n #undef THIS_FILE
.7'kw]{/ static char THIS_FILE[] = __FILE__;
0nn okN^ #endif
O ,rwP #define MAX_KEY 100
3&u_A?; #define CTRLBIT 0x04
qPB8O1fyU #define ALTBIT 0x02
f.aSKQD #define SHIFTBIT 0x01
>_rha~ #pragma data_seg("shareddata")
0&qr HHOOK hHook =NULL;
P71 ( UINT nHookCount =0;
Qy<[7 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
q)H1pwxD static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Vd".u'r static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
\!( static int KeyCount =0;
rG#Z=*b% static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
}X x(^Zh #pragma data_seg()
0TfS=scT HINSTANCE hins;
CTWn2tpW void VerifyWindow();
.s#;s'>g BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
!d<"nx[2` //{{AFX_MSG_MAP(CHookApp)
Gl1jxxd // NOTE - the ClassWizard will add and remove mapping macros here.
:4~g;2oag // DO NOT EDIT what you see in these blocks of generated code!
RoCfJ65 //}}AFX_MSG_MAP
x~.:64 END_MESSAGE_MAP()
0sI1GhVR iX0iRC6f CHookApp::CHookApp()
R[49(>7H4 {
c/B'jPt // TODO: add construction code here,
763+uFx^ // Place all significant initialization in InitInstance
[tMZ G%h }
f|y:vpd% J=pztASt CHookApp theApp;
V9ssH87# LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
lKEkXO {
; 7N
Z<k BOOL bProcessed=FALSE;
AuR$g7z if(HC_ACTION==nCode)
d
Le-nF {
.{;Y'Zc14S if((lParam&0xc0000000)==0xc0000000){// Key up
RI68%ZoL switch(wParam)
sXd8rj:o {
rr#K"SP case VK_MENU:
;raN MaskBits&=~ALTBIT;
B||;' break;
spasB=E case VK_CONTROL:
A'G@uD@3 MaskBits&=~CTRLBIT;
`"qP break;
0IQ'3_ case VK_SHIFT:
LH:i| I MaskBits&=~SHIFTBIT;
(`? y2n)~W break;
AfG/JWSo} default: //judge the key and send message
qc#)! break;
1 sPdz
L }
j5
g# M for(int index=0;index<MAX_KEY;index++){
+ >cBVx6 if(hCallWnd[index]==NULL)
)K'N(w continue;
aZEn6*0B if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<C9 XX~ {
[F5h SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
""s]zNF} bProcessed=TRUE;
`vc
"Q/ }
' B }
PMfkA!.Y }
C/(M"j M else if((lParam&0xc000ffff)==1){ //Key down
U^qt6$bK switch(wParam)
"B_K
XL {
&Wf3~hmo case VK_MENU:
M-i_#EWP MaskBits|=ALTBIT;
*xp\4;B
break;
lo'W1p case VK_CONTROL:
Isx#9C MaskBits|=CTRLBIT;
gocrjjAHk break;
>Z1q j> case VK_SHIFT:
1 { , F MaskBits|=SHIFTBIT;
)P7)0c break;
lY*[tmz) default: //judge the key and send message
<(vCiH9~P break;
XJ2^MF2BU }
2< hAa9y for(int index=0;index<MAX_KEY;index++)
!Ci~!)$z6 {
&i!vd/*WlD if(hCallWnd[index]==NULL)
D5~n/.B" continue;
^Q&u0;OJ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
"T H6o:x {
7<H
|QL& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
)]#aa uC+ bProcessed=TRUE;
~^+0 }
si4don }
nNXgW }
0-{tFN if(!bProcessed){
"(qw-kil for(int index=0;index<MAX_KEY;index++){
A{B/lX) if(hCallWnd[index]==NULL)
GJqE!I,. continue;
wp7!>%s{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Y'e eA 2O SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
:a:l
j }
M@W[Bz }
^fz+41lE\ }
Hi]cxD*` return CallNextHookEx( hHook, nCode, wParam, lParam );
ItVugI(^ C }
ZIdA\_c zXsc1erli BOOL InitHotkey()
_4 cvX {
pStk/te,XK if(hHook!=NULL){
]\ngX;h8G nHookCount++;
(LHp%LaZ\; return TRUE;
OxGE%R, }
e6_ZjrQf else
n&A'C\ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
^T~gEv if(hHook!=NULL)
CIVnCy z nHookCount++;
upvS|KUil return (hHook!=NULL);
-7!&@wuQ }
#Km:}= BOOL UnInit()
{647|j;e {
&F}"Z(B<wK if(nHookCount>1){
^uJU}v: nHookCount--;
k=GG>]<i return TRUE;
9Ct` }
yPw'] " BOOL unhooked = UnhookWindowsHookEx(hHook);
Tlj:%yK2 if(unhooked==TRUE){
fm~kM
J nHookCount=0;
exdx\@72 hHook=NULL;
nADX0KI }
L#)(H^[ return unhooked;
lWm' }
(Z5##dS3 #yI.nzA* BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
e?bYjJq {
5sPywk{ BOOL bAdded=FALSE;
OGiV{9U for(int index=0;index<MAX_KEY;index++){
Ap{}^ if(hCallWnd[index]==0){
<}6{{&mT4 hCallWnd[index]=hWnd;
RllY-JBO HotKey[index]=cKey;
!A1)|/a@ HotKeyMask[index]=cMask;
ny-7P;->8 bAdded=TRUE;
(6v(9p KeyCount++;
ceGa([#!\_ break;
*)]"27^ }
D|qk_2R% }
{K#NB_*To return bAdded;
#}^-C&~ }
)EyI0R] 5 80M;4nH^5 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
4lKVY< {
G#Ou[*O' BOOL bRemoved=FALSE;
`bKA+c,f for(int index=0;index<MAX_KEY;index++){
yk2 !8 if(hCallWnd[index]==hWnd){
x{}z ;yG if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
TO,rxf hCallWnd[index]=NULL;
9{j66 HotKey[index]=0;
)Z+{|^`kJ HotKeyMask[index]=0;
\8OO)98' bRemoved=TRUE;
UueD(T;p KeyCount--;
&4dz}zz90 break;
eK /?%t }
~8`:7m? }
S'~o,`xy }
')S;[= v return bRemoved;
vhr+g 'tf }
}G$]LWgQx
yz+, gLY void VerifyWindow()
@&1Wyp {
9@$,oM= for(int i=0;i<MAX_KEY;i++){
N^VD=<#T if(hCallWnd
!=NULL){ /RLq>#:h**
if(!IsWindow(hCallWnd)){ (wRBd
hCallWnd=NULL; =\ )IaZ
HotKey=0; /W#O +
HotKeyMask=0; 3>z[PPw
KeyCount--; 7:=5"ScV
} O$`UCq
} x}$e}8|8YL
} *p ? e.%nd
} $3=:E36K
H]<]^Zmjy
BOOL CHookApp::InitInstance() (UNtRz'=;
{ B6Ej{q^k,
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~fz[x 9\
hins=AfxGetInstanceHandle(); Y^"4?96
InitHotkey(); m8+(%>+7
return CWinApp::InitInstance(); l^NC]t
} vjViX<#(V
puJ#w1!x`
int CHookApp::ExitInstance() e2$]g>
{ .V6-(d
VerifyWindow(); E&
36H
UnInit(); A CNfS9M_w
return CWinApp::ExitInstance(); SN+S6
} ydWtvFuS
Mu_i$j$vvP
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file s_jBu
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 2>S~I"o0
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 2^exL h
#if _MSC_VER > 1000 &A!KJ.
#pragma once BH0!6Oq
#endif // _MSC_VER > 1000 sc`"P-J+vp
kR.wOJ7'
class CCaptureDlg : public CDialog *.y' (tj[
{ aI#4H+/
// Construction #`tD1T{;
public:
yeD_j/
BOOL bTray; 'Tb0-1S?
BOOL bRegistered; c-XLI
BOOL RegisterHotkey(); FYPz 4K
UCHAR cKey; w'Z!;4E0
UCHAR cMask; 7x.%hRk
void DeleteIcon(); pt:;9hA
void AddIcon(); v@ONo?)
UINT nCount; +I|8Q|^SD
void SaveBmp(); eNySJf
CCaptureDlg(CWnd* pParent = NULL); // standard constructor h"QbA"
// Dialog Data c|wCKn}`
//{{AFX_DATA(CCaptureDlg) EiV=RdL
enum { IDD = IDD_CAPTURE_DIALOG }; j.-VJo)
CComboBox m_Key; RagiV6c
BOOL m_bControl; 2?i\@r@E|
BOOL m_bAlt; ZcPUtun
BOOL m_bShift; m^!Sv?hV
CString m_Path; yYAnwf
CString m_Number; }$&WC:Lg
//}}AFX_DATA s*,cF6
// ClassWizard generated virtual function overrides PNF4>)
//{{AFX_VIRTUAL(CCaptureDlg) F 1|zXg)
public: #!!AbuhzK{
virtual BOOL PreTranslateMessage(MSG* pMsg); }(i(Ar-
protected: f==*"?6\
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;cSGlE |
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ":WYcaSi
//}}AFX_VIRTUAL ^/KfH&E
// Implementation 2tr
:xi@
protected: P!+v:'P5f
HICON m_hIcon; {Qtq7q.
// Generated message map functions |1V2tx
//{{AFX_MSG(CCaptureDlg) y/4ny,s"
virtual BOOL OnInitDialog(); GEE
]Kr
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); nTZ> |R)
afx_msg void OnPaint(); <%!J?
afx_msg HCURSOR OnQueryDragIcon(); ' Js?N
virtual void OnCancel(); `mErF%b
afx_msg void OnAbout(); EODB`$+
afx_msg void OnBrowse(); ;/Q6i
afx_msg void OnChange(); jKt-~:
//}}AFX_MSG ?iln<%G
DECLARE_MESSAGE_MAP()
[,7-w
}; u( 9X
#endif xURw,
7Dl%UG]
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file +Jw{qQR/*
#include "stdafx.h" _W9&J&l0so
#include "Capture.h" G]lvHD
#include "CaptureDlg.h" XM!M%.0WS
#include <windowsx.h> uYTCd ZQh
#pragma comment(lib,"hook.lib") 1l]C5P}E
#ifdef _DEBUG ,Oi^ySn
#define new DEBUG_NEW X8b#[40:
#undef THIS_FILE {bTeAfbf]
static char THIS_FILE[] = __FILE__; n#>5?W
#endif `cO|RhD@
#define IDM_SHELL WM_USER+1 no3Z\@%
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); cj^bh
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &|z|SY]DL
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _?Ckq
class CAboutDlg : public CDialog )OUU]MUH
{ c! ~T2t
public: e?vj+ZlS$f
CAboutDlg(); i puo}
// Dialog Data WY.5K
=}
//{{AFX_DATA(CAboutDlg) U3VT*nj'
enum { IDD = IDD_ABOUTBOX }; S>EDL
//}}AFX_DATA E!dp~RwZu
// ClassWizard generated virtual function overrides ;Xh5oB\)W
//{{AFX_VIRTUAL(CAboutDlg) [0(mFMC`
protected: cyb(\ fsC
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \>;%Ji
//}}AFX_VIRTUAL &E]"c]i+
// Implementation S~|tfJpL
protected: D2?S,9+E_
//{{AFX_MSG(CAboutDlg) iPkT*Cl8
//}}AFX_MSG ~*kK4]lP
DECLARE_MESSAGE_MAP() bZXlJa`'S
}; . =R=cA7
5*XH6g F
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) HqRCjD
{ IdmD.k0pJ
//{{AFX_DATA_INIT(CAboutDlg) }+JLn%H)
//}}AFX_DATA_INIT AgCs;k&IG
} Xr2 Wa
}JGq 1
void CAboutDlg::DoDataExchange(CDataExchange* pDX) %Y 2G
{ 0/*X=5
CDialog::DoDataExchange(pDX); `r9^:TMN
//{{AFX_DATA_MAP(CAboutDlg) CwB] )QV?
//}}AFX_DATA_MAP *cQz[S@F
} 6,zDBax
=ty2_6&>
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) .Map
//{{AFX_MSG_MAP(CAboutDlg) hvL6zCi
// No message handlers `{WCrw6)
//}}AFX_MSG_MAP 1V\1]J/
END_MESSAGE_MAP() YOlH*cZtg
klo^K9!
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) S}O5l}E
: CDialog(CCaptureDlg::IDD, pParent) 0O^U{#*$I
{ gvK"*aIj
//{{AFX_DATA_INIT(CCaptureDlg) JQr36U
m_bControl = FALSE; J:[3;Z
m_bAlt = FALSE; E~qK&7+
m_bShift = FALSE; Upu%.[7
m_Path = _T("c:\\"); /:^tc/5U]
m_Number = _T("0 picture captured."); I>!|3ElT
nCount=0; hOV_Oqe4?
bRegistered=FALSE; 1k`|[l^
bTray=FALSE;
rA2qV
//}}AFX_DATA_INIT fA;x{0CAMX
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 JfR kp
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); VJGwd`qo*A
} FmR\`yY_,
m/cx|b3hqv
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) `dP? 2-Z
{ -IGMl_s
CDialog::DoDataExchange(pDX); [10$a(g\x
//{{AFX_DATA_MAP(CCaptureDlg) T<_+3kw
DDX_Control(pDX, IDC_KEY, m_Key); &KLvr|
DDX_Check(pDX, IDC_CONTROL, m_bControl); W0+u)gDDz
DDX_Check(pDX, IDC_ALT, m_bAlt); + I?Qg
DDX_Check(pDX, IDC_SHIFT, m_bShift); \?[O,A
DDX_Text(pDX, IDC_PATH, m_Path); Jr|K>
DDX_Text(pDX, IDC_NUMBER, m_Number); YALyZ.d
//}}AFX_DATA_MAP w:n(pLc<
} Un~]Q?w
z)r8?9u
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) \gjl^#;
//{{AFX_MSG_MAP(CCaptureDlg) Y{`3`Pg&N
ON_WM_SYSCOMMAND() qNhH%tYQ
ON_WM_PAINT() P:jDB{
ON_WM_QUERYDRAGICON() 7Z9.z4\
ON_BN_CLICKED(ID_ABOUT, OnAbout) "hJ7 Vv_
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) {P,>Q4N
ON_BN_CLICKED(ID_CHANGE, OnChange) aS2a_!f
//}}AFX_MSG_MAP 8U8P
g2
END_MESSAGE_MAP() JB641nv
L)@`58Eil
BOOL CCaptureDlg::OnInitDialog() iz,]%<_PE
{ l A 0-?k
CDialog::OnInitDialog(); ^V_ku@DY
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |)~Ex 9%ev
ASSERT(IDM_ABOUTBOX < 0xF000); wbn^R'
CMenu* pSysMenu = GetSystemMenu(FALSE); 7cy+Nz
if (pSysMenu != NULL) Fa6H(L3
{ j'#)~>b
CString strAboutMenu; 9@JlaY)0
strAboutMenu.LoadString(IDS_ABOUTBOX); eUi> Mp
if (!strAboutMenu.IsEmpty()) ,M| QN*
{ pW`ntE#L
pSysMenu->AppendMenu(MF_SEPARATOR); R994R@gz
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); '
}y]mFpF
} i/l!Cr2
} Cij$GYkv
SetIcon(m_hIcon, TRUE); // Set big icon 3Pw%[q=g
SetIcon(m_hIcon, FALSE); // Set small icon oSpi{ $x
m_Key.SetCurSel(0); sDW"j\
RegisterHotkey(); T2;v<(
CMenu* pMenu=GetSystemMenu(FALSE); L{4),65
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); IptB.bYc
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); GGYX!=]~
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6:e}v'q{
return TRUE; // return TRUE unless you set the focus to a control z_5rAlnwT.
} WV5r$
|_xZ/DT
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]b5%?^Z#
{ m~A[V,os
if ((nID & 0xFFF0) == IDM_ABOUTBOX) R
(+h)#![
{ =vB]*?;9
CAboutDlg dlgAbout; 3tJ=d'U
dlgAbout.DoModal(); !y[}|
} a/wUeW
else U}mL,kj"
{ (MF+/fi
CDialog::OnSysCommand(nID, lParam); @S/g,;7"
} FN{H\W1cf
} ::^qy^n
jV(xYA3
void CCaptureDlg::OnPaint() 1R^XWAb
{ nsM>% +o
if (IsIconic()) ze#rYN vo/
{ NgmO0H
CPaintDC dc(this); // device context for painting \}]=?}(
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 9&|12x$
// Center icon in client rectangle wdN>KS2!
int cxIcon = GetSystemMetrics(SM_CXICON); <-Kb@V3
int cyIcon = GetSystemMetrics(SM_CYICON); bUY:XmA
CRect rect; ,)B~cic'u
GetClientRect(&rect); {ziYd;Ys1
int x = (rect.Width() - cxIcon + 1) / 2; =rf)yp-D
int y = (rect.Height() - cyIcon + 1) / 2; (Von;U
// Draw the icon wsdB;
6%$
dc.DrawIcon(x, y, m_hIcon); Mm:a+T
} W07-JHV%
else vu
!j{%GO
{ &V ^
CDialog::OnPaint(); n',9#I(!L
} jWO&SW so
} )sqp7["-
: pE-{3I
HCURSOR CCaptureDlg::OnQueryDragIcon() +Tgy,oD0
{ F1{?]>G
return (HCURSOR) m_hIcon; Mdy0!{d
} S?,KgMVM
[FeJ8P>z
void CCaptureDlg::OnCancel() mlsvP%[f.
{ vkNZ -`+I
if(bTray) p3,(*eZ
DeleteIcon(); n;S0fg
CDialog::OnCancel(); eY6gb!5u
} @SF")j|
^-csi
void CCaptureDlg::OnAbout() /:*R -VdF
{ ^>vO5Ho.
CAboutDlg dlg; ~8Dd<4?F]
dlg.DoModal(); M Z|c7f&`
} ]/<Qn-BbU
@'NaA SB
void CCaptureDlg::OnBrowse() |~=?vw<W
{ }{w_>!ee
CString str; ')yF0
BROWSEINFO bi; fO^EMy\
char name[MAX_PATH]; {_k!!p6
ZeroMemory(&bi,sizeof(BROWSEINFO)); nfd?@34"A2
bi.hwndOwner=GetSafeHwnd(); U(Hq4D
bi.pszDisplayName=name; .x-Z+Rs{g
bi.lpszTitle="Select folder"; o}AqNw60v
bi.ulFlags=BIF_RETURNONLYFSDIRS; 2!~>)N
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Y+PvL|`O
if(idl==NULL) =Y=^]ayO/
return; 46.q anh
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); I;|5C=!
str.ReleaseBuffer(); [u9S+:7"
m_Path=str; B#Oc8`1Y
if(str.GetAt(str.GetLength()-1)!='\\') d@q t%r3;
m_Path+="\\"; ytBxe]
UpdateData(FALSE); yrK--C8
} tKqCy\-q
2}xFv2X
void CCaptureDlg::SaveBmp() |Z^c#R
{ )lngef
/D_
CDC dc; WSpg(\Cs
dc.CreateDC("DISPLAY",NULL,NULL,NULL); [#3Cg%V
CBitmap bm; }mT%N eS
int Width=GetSystemMetrics(SM_CXSCREEN); oRJP5Y5na
int Height=GetSystemMetrics(SM_CYSCREEN); (1r>50Ge
bm.CreateCompatibleBitmap(&dc,Width,Height); ,[K)E
CDC tdc; n9-q5X^e>
tdc.CreateCompatibleDC(&dc); 2YP"nj#
CBitmap*pOld=tdc.SelectObject(&bm); @ T~#Gwv
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); OD@@O9
tdc.SelectObject(pOld); |2t7mat
BITMAP btm; qeO6}A"^|
bm.GetBitmap(&btm); %Cbc@=k
DWORD size=btm.bmWidthBytes*btm.bmHeight; uK&wS#uY
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); qwq+?fj={
BITMAPINFOHEADER bih; s%TO(vT
bih.biBitCount=btm.bmBitsPixel; li'1RKr
bih.biClrImportant=0; tU~H@'
bih.biClrUsed=0; %>z8:oJ
bih.biCompression=0; Uub%s`O
bih.biHeight=btm.bmHeight; $P}]|/Yb
bih.biPlanes=1; H|Fqc=qp
bih.biSize=sizeof(BITMAPINFOHEADER); 0f#a_
bih.biSizeImage=size; .Mft+,"
bih.biWidth=btm.bmWidth; 0|+hm^'_
bih.biXPelsPerMeter=0; $E@.G1T [
bih.biYPelsPerMeter=0; Z-sN4fr a
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); D(ntVR
static int filecount=0; 02c.;ka3
CString name; G|Yp<W%o
name.Format("pict%04d.bmp",filecount++); :>-sITeY
name=m_Path+name; CH_Dat>
BITMAPFILEHEADER bfh; .gsu_N_v
bfh.bfReserved1=bfh.bfReserved2=0; VEYKrZA
bfh.bfType=((WORD)('M'<< 8)|'B'); >D^7v(&
bfh.bfSize=54+size; I8oKa$RF
bfh.bfOffBits=54; .$s|T
CFile bf; LVcy.kU@]
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %<*pM@
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); E$yf2Q~k
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); k49n9EX
bf.WriteHuge(lpData,size); SVEA
bf.Close(); DBrzw+;e3
nCount++; &l}xBQAL
} T7Qd
I[K%b
GlobalFreePtr(lpData); X%\6V;zR#
if(nCount==1) B46H@]d#7K
m_Number.Format("%d picture captured.",nCount); uXW.
(x7"f
else i$<v*$.o
m_Number.Format("%d pictures captured.",nCount); U,3K6AZA 7
UpdateData(FALSE); nsw8[pk
} i2R]lE8
UU~;B
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) K~~*M?.Z
{ cw-JGqLx
if(pMsg -> message == WM_KEYDOWN) `0vy+T5
{ KdQ|$t
if(pMsg -> wParam == VK_ESCAPE) FbNQ
return TRUE; ^WYG?/{4
if(pMsg -> wParam == VK_RETURN) EjCzou
return TRUE; 2
]6u
Be
} 2X|jq4
return CDialog::PreTranslateMessage(pMsg); .B-,GD}
} uC ;PP=z
q@yabuN@,j
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _I"<?sh3
{ <y/AEY1
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ T1W9@9,s
SaveBmp(); vh.tk^&
return FALSE; "YU~QOGx@
} ^9~%=k=
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @9P9U`ZP
CMenu pop; FNRE_83
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); =@/^1.`
CMenu*pMenu=pop.GetSubMenu(0); QF6JZQh<
pMenu->SetDefaultItem(ID_EXITICON); }(IDPaJ
CPoint pt; (j
Q6~1
GetCursorPos(&pt); e~[z]GLO%
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); otVdx&%]
if(id==ID_EXITICON) ,'DrFlI
DeleteIcon(); B{7/A[$%C
else if(id==ID_EXIT) 4T\/wyq0
OnCancel(); PS;*N8
return FALSE; zC;lfy{f=
} 2G>
]W?>
LRESULT res= CDialog::WindowProc(message, wParam, lParam); m|gd9m$,?
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 'UCx^-
AddIcon(); A>@epCD
return res; AdW7 vn
} X.5LB!I)
-zkL)<7
void CCaptureDlg::AddIcon() ``CADiM:S
{ vK~KeZ\,p=
NOTIFYICONDATA data; 4?uG> ;V
data.cbSize=sizeof(NOTIFYICONDATA); UwT$IKR
CString tip; Y\S^DJy
tip.LoadString(IDS_ICONTIP); _qNLy/AY
data.hIcon=GetIcon(0); '0rwNEg
data.hWnd=GetSafeHwnd(); .[s82c]]6
strcpy(data.szTip,tip); Tz~ftf
data.uCallbackMessage=IDM_SHELL; +>({pHZ<S
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; |.W;vc <
data.uID=98; l[{}ZKZ
Shell_NotifyIcon(NIM_ADD,&data); z3LPR:&Z
ShowWindow(SW_HIDE); C^O^Jj5X%
bTray=TRUE; K<(sqH
} 1<e%)? G
>7Q7H#~w
void CCaptureDlg::DeleteIcon() > PA,72e
{ 6VE5C
g
NOTIFYICONDATA data; sUMn
(@r
data.cbSize=sizeof(NOTIFYICONDATA); ^C
T}i'
data.hWnd=GetSafeHwnd(); 8nR,GW\
data.uID=98; &cE,9o%FZ
Shell_NotifyIcon(NIM_DELETE,&data); a}hM}U!
ShowWindow(SW_SHOW); {627*6,
SetForegroundWindow(); jo#F&
ShowWindow(SW_SHOWNORMAL); Uwa1)Lwn
bTray=FALSE; (j"MsCwE
} >xgd<
S3wH
M
void CCaptureDlg::OnChange() 5nb6k,+E
{ F\72^,0
RegisterHotkey(); IQv>{h}
} F'*4:WD7
- mXr6R?
BOOL CCaptureDlg::RegisterHotkey() {mGWMv
{ VHNiTp
UpdateData(); }Cf[nGh|B
UCHAR mask=0; M lwQ_5O
UCHAR key=0; !-~(*tn
if(m_bControl) [GM<Wt0
mask|=4; ^q2zqC
if(m_bAlt) ywte\}
mask|=2; A[a+,TN{
if(m_bShift) P://Zi6>
mask|=1; S45_-aE
key=Key_Table[m_Key.GetCurSel()]; 1^dWmxUZH
if(bRegistered){ L,L7WObA
DeleteHotkey(GetSafeHwnd(),cKey,cMask); @kymL8"2w
bRegistered=FALSE; v:;cTX=x`#
} P2F>iK#U
cMask=mask; G$<0_0GF
cKey=key; Y.#+Yh[
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); E3.s8}}
return bRegistered; uD3_'a
} :"]ei@
$S{j}74[
四、小结 cIjsUqKa
h65j,v6B
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。