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:
}+*w.X}L
SQKi2\8w 一、实现方法
L,E-z_<p N/(ofy 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:
;,mBT[_ZO %Fs*#S #pragma data_seg("shareddata")
K?$9N}+ HHOOK hHook =NULL; //钩子句柄
a^%8QJW UINT nHookCount =0; //挂接的程序数目
i[o&z$JO static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
sN"p5p static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
/4(Z`e;0 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
]!]`~ Z/ static int KeyCount =0;
!?S5IGLOj static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
M\9at\$ #pragma data_seg()
l#tS.+B7 "L ^TT2 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。
0W;q!H[G *iPs4Es- 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:
,:c:6Y^ 6.k^m&-A BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
-6AOK<kfI cKey,UCHAR cMask)
9cl{hdP{ {
^xzE^"G6 BOOL bAdded=FALSE;
an-\k*w for(int index=0;index<MAX_KEY;index++){
n'! -Pv if(hCallWnd[index]==0){
O)Xd3w' hCallWnd[index]=hWnd;
d]^\w'w$ HotKey[index]=cKey;
Lr K9F^c HotKeyMask[index]=cMask;
"1_{c *ck bAdded=TRUE;
yW%&_s0 KeyCount++;
BT&rp%NO6l break;
czXI?]gg, }
<+ -V5O^ }
;Gjv9:hUn return bAdded;
jB*9 !xrd, }
5}<.1ab3V //删除热键
qPp1:a" BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Tbe_xs^ {
LBW.*PHW BOOL bRemoved=FALSE;
z~GVvgd for(int index=0;index<MAX_KEY;index++){
e_YW~z=6t if(hCallWnd[index]==hWnd){
^nG1/} if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
J&
1X hCallWnd[index]=NULL;
;+S2h-4 HotKey[index]=0;
THrc
H HotKeyMask[index]=0;
=4YbVA+( bRemoved=TRUE;
U;x99Go: KeyCount--;
Z)C:]}Ex break;
zyIza @V( }
;m-6.AV }
Ej;Vr~Wi }
##SLwrg return bRemoved;
*5ka.=Qs }
@C!JtgO% }`+O$0A dL1~]Z
y
DLL中的钩子函数如下:
_Ym&UY.u# *O"%tp6 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
^G]KE8 {
M>`?m
L BOOL bProcessed=FALSE;
DR.3
J`?K if(HC_ACTION==nCode)
nEjo, {
aL_;`@4 if((lParam&0xc0000000)==0xc0000000){// 有键松开
?AqrlR]5 switch(wParam)
BZ]&uD|f
{
7AZ5%o case VK_MENU:
6Y0/i,d* MaskBits&=~ALTBIT;
?7rmwy\ break;
{jj]K.& case VK_CONTROL:
;`X`c MaskBits&=~CTRLBIT;
J>,'P^ break;
fY|@{]rx case VK_SHIFT:
v*vub#wP MaskBits&=~SHIFTBIT;
D'HL /[@` break;
` 4s#5g default: //judge the key and send message
>=Rd3dgDG break;
&-EyM*:u! }
B`'}&6jr. for(int index=0;index<MAX_KEY;index++){
T>AI0R3 if(hCallWnd[index]==NULL)
m)tI continue;
`R4W4h'I if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
z/c'Z#w% {
Y{x[N}h SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
*~\;&G29Y bProcessed=TRUE;
@LwVmR |{ }
bTA14&&q }
$6Q2)^LJ }
Z7K!"I else if((lParam&0xc000ffff)==1){ //有键按下
^*$WZMMJ1 switch(wParam)
qiwQUm{ {
'ugR!o1 case VK_MENU:
BP7<^`i& MaskBits|=ALTBIT;
yKX:Z4I/ break;
\kua9bK case VK_CONTROL:
$S"zxEJJ Y MaskBits|=CTRLBIT;
%j
9vX$Hj break;
J8`1V`$ case VK_SHIFT:
tA;ZW2$# MaskBits|=SHIFTBIT;
bKZAJLnd break;
(+]Ig> t default: //judge the key and send message
<uWJ>sg^6 break;
W2X+NacD }
}[hDg6i for(int index=0;index<MAX_KEY;index++){
DbPBgD>Q if(hCallWnd[index]==NULL)
Yc|-sEK/ continue;
A61-AwvF8- if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
{4V:[*3 {
&L[8Mju6 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
B8BY3~}] bProcessed=TRUE;
]% ZjD }
dxae2 tV }
)nbyV a }
@eG#%6"> if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
^YB\\a9 for(int index=0;index<MAX_KEY;index++){
T^f&58{ 7 if(hCallWnd[index]==NULL)
<7RkM continue;
l")o!N? if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
XH_qA[=c] SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Cbf,X[u //lParam的意义可看MSDN中WM_KEYDOWN部分
:">~(Rd ZH }
+@<^i?ale }
37za^n?SG }
\sXmMc return CallNextHookEx( hHook, nCode, wParam, lParam );
lzQ&)7` }
f R{WS:Pv MZhJ,km) 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
* Kp ^al pqNoL*
H BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Di5Op(S(( BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
B=nx8s /fcwz5~ 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
#!F8n` C- _#\5]D~"" LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
a7 '\* {
=fu_ Jau} if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
0 ^-b} {
iaq:5||, //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
ES:p^/ =* SaveBmp();
*^&iw$Qx3 return FALSE;
36D,el In }
?),K=E+=U …… //其它处理及默认处理
5D q{"@E }
r0XGGLFuZl T J"{nB :[$i~V 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
*TMM:w|1 @tU>~y{E 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
[$ Xu GQc%OQc\ 二、编程步骤
%@,:RA\pm 5tbiNm^X 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";
q=i,'.nS h11bK'TIv 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
f<xt3 n*]x02:LjZ 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;
A5J#x6@ /(}l[jf 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;
kQ:>j.^e #IciNCIrG 5、 添加代码,编译运行程序。
5Qe}v Y_ u7
0@` 三、程序代码
?\ i,JJO 7[ VCCI
g ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
(l,YI"TzT #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
^gVbVz[17 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Ub-k<]yZ #if _MSC_VER > 1000
9R<J$e #pragma once
,HjHt\!~< #endif // _MSC_VER > 1000
Xwn|. #ifndef __AFXWIN_H__
N6 Cc%, #error include 'stdafx.h' before including this file for PCH
s?gXp{O?X #endif
+r34\mAO #include "resource.h" // main symbols
i_Q4bhVj class CHookApp : public CWinApp
Z_TbM^N {
@eD2<e public:
Wug ?CFX+T CHookApp();
EC&19 // Overrides
8CHf. SXh // ClassWizard generated virtual function overrides
m_Y}> //{{AFX_VIRTUAL(CHookApp)
|@uhq>& public:
Hwi7oXP virtual BOOL InitInstance();
Wn)A/Z ^r virtual int ExitInstance();
.m
% x-i //}}AFX_VIRTUAL
O"w_sw //{{AFX_MSG(CHookApp)
MDXQj5s^ // NOTE - the ClassWizard will add and remove member functions here.
enO=-# // DO NOT EDIT what you see in these blocks of generated code !
7B> cmi //}}AFX_MSG
pLFL6\{g DECLARE_MESSAGE_MAP()
@;-Un/'C;7 };
|kRx[UL LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
S}oF7;'Ga BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
E?W!.hbA BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
bu!<0AP"N+ BOOL InitHotkey();
[ZpG+VAJ8 BOOL UnInit();
LHGK!zI #endif
XwqfWd_ (%^TTe //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
!N2 n@bo #include "stdafx.h"
<Ucfd
G&Lp #include "hook.h"
w2_I/s6B #include <windowsx.h>
>5Rw~ #ifdef _DEBUG
Bk(XJAjY #define new DEBUG_NEW
dXSb%ho #undef THIS_FILE
2T?1X{g static char THIS_FILE[] = __FILE__;
Vam8NnZ|r #endif
ErUk>V #define MAX_KEY 100
.*..pf|/ #define CTRLBIT 0x04
?J1&,'& #define ALTBIT 0x02
>WG91b<Xq #define SHIFTBIT 0x01
dJgOfg^ #pragma data_seg("shareddata")
GAe_Z(T HHOOK hHook =NULL;
$+yQ48Wq UINT nHookCount =0;
3xR#,22:} static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
1 jd=R7 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
9U%}"uE static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
BJ;c F"Kp static int KeyCount =0;
|zegnq~ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
!)1Zp* #pragma data_seg()
>@\?\!Go HINSTANCE hins;
xH.q void VerifyWindow();
krT!AfeV BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
dtXJ<1: //{{AFX_MSG_MAP(CHookApp)
v}t:}M<; // NOTE - the ClassWizard will add and remove mapping macros here.
FKTP0e7=9 // DO NOT EDIT what you see in these blocks of generated code!
}E]&13>r //}}AFX_MSG_MAP
8J@OMW&[l END_MESSAGE_MAP()
`e:RZ UmMYe4LQR CHookApp::CHookApp()
g0U\AN {
X_yU"U // TODO: add construction code here,
:BiR6>1: // Place all significant initialization in InitInstance
ymJw{&^am }
B~?Q. <M U0=zuRr n CHookApp theApp;
246!\zf LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
mLdyt-1 {
eyp\h8!u_ BOOL bProcessed=FALSE;
@Pg@ltUd if(HC_ACTION==nCode)
#8HXR3L5=! {
>.sN?5}y if((lParam&0xc0000000)==0xc0000000){// Key up
?v*7!2; switch(wParam)
4C*=8oe_ {
nqW:P$ case VK_MENU:
im%3*bv- MaskBits&=~ALTBIT;
2n,73$s break;
833t0Ml1A/ case VK_CONTROL:
8-#2?= MaskBits&=~CTRLBIT;
*y$r y] break;
n Fn`>kQ case VK_SHIFT:
g#&##f MaskBits&=~SHIFTBIT;
tAn6pGp break;
AMiFsgBj default: //judge the key and send message
%HS!^j3C% break;
_\6(4a`, }
M?CMN.Dw for(int index=0;index<MAX_KEY;index++){
pIjVJ9+j if(hCallWnd[index]==NULL)
meWq9:z continue;
dQ"W~ig if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
?Gu>!7 {
=)>q.R9 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
ZOsn,nF bProcessed=TRUE;
ml/O }
J<O_N~$$* }
s$G8`$+i1 }
OlFn<:V K else if((lParam&0xc000ffff)==1){ //Key down
jv^L~<u switch(wParam)
JQ4>S<ttJ {
+`[Sv%v&L case VK_MENU:
P.P>@@+d MaskBits|=ALTBIT;
oVgNG!/c0 break;
}#
^PbM case VK_CONTROL:
y=`(`|YW}` MaskBits|=CTRLBIT;
)SLs
[ break;
a
VMFjkW case VK_SHIFT:
\5_^P{p7< MaskBits|=SHIFTBIT;
&g {_.n, break;
W.<<azi default: //judge the key and send message
_QCI<|A break;
(`*wiu+i }
00TdX|V` for(int index=0;index<MAX_KEY;index++)
6S&YL {
|`/uS;O if(hCallWnd[index]==NULL)
8hA=$}y&x continue;
ApBThW*E if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
?V)6`St#C {
k,(_R= SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
p+?WhxG) bProcessed=TRUE;
xo+z[OIlF }
1MSu])
W }
G-<~I#k }
aC`
c^'5 if(!bProcessed){
vRs5-T for(int index=0;index<MAX_KEY;index++){
PTqS L] if(hCallWnd[index]==NULL)
TR20{8" continue;
<ZdNPcT<s if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
}aIfIJ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
c,ek]dTj }
n-Y'LK40Os }
0&~u0B{ }
SsZzYj.d return CallNextHookEx( hHook, nCode, wParam, lParam );
-/?<@*n }
'_Op rx bq]a8tSB BOOL InitHotkey()
'h=2_%l@Y {
RMXj)~4. if(hHook!=NULL){
mAa]Et. nHookCount++;
kMXl
{ return TRUE;
s9>!^MzBK }
]^<~[QK_C else
W@=ilW3RD hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
tT:yvU@a if(hHook!=NULL)
7L"/4w nHookCount++;
uUs>/+ return (hHook!=NULL);
5K<C }
z(qz(`eGC& BOOL UnInit()
?CDq^)T[ {
q4oZJ -` if(nHookCount>1){
,,gYU_V nHookCount--;
!NjE5USi return TRUE;
Y}Uw7\e }
x
,W+:l9~s BOOL unhooked = UnhookWindowsHookEx(hHook);
sn%fE if(unhooked==TRUE){
8),Y|4 nHookCount=0;
2hP8ZfvIR hHook=NULL;
.VT,,0 }
6npwu5! return unhooked;
":ycyN@g }
79_MP {{\HU0g>& BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Z%R^;8 !~ {
Dl{Pd`D BOOL bAdded=FALSE;
XLT<,B}e for(int index=0;index<MAX_KEY;index++){
W!*vO>^1W if(hCallWnd[index]==0){
AbB>ZT>hR hCallWnd[index]=hWnd;
\mloR
' HotKey[index]=cKey;
'>BHwc HotKeyMask[index]=cMask;
0saEcJ- bAdded=TRUE;
v]~[~\|a KeyCount++;
[qB=OxH? break;
\BW(c)Q }
QR4o j }
f`e.c_n( return bAdded;
>Mn.|:DF]& }
R0[Gfq9M= oLoa71Q} BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
0P 42C{>'w {
bkTj
Q BOOL bRemoved=FALSE;
ojri~erJE? for(int index=0;index<MAX_KEY;index++){
lRb)Tz6SE if(hCallWnd[index]==hWnd){
|a+8-@-Tj if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
2 6A#X hCallWnd[index]=NULL;
65v'/m!ys HotKey[index]=0;
~WSC6Bh@9 HotKeyMask[index]=0;
|wx1
[xZ bRemoved=TRUE;
[Wc 73- KeyCount--;
c@`P{6 break;
Wj&s5;2a }
&n|gPp77$ }
*O~D lf }
G`jhzG return bRemoved;
>\ W" 3. }
0dW1I|jR 9EEHLx" void VerifyWindow()
K4"as9oFP {
5>
UgBA for(int i=0;i<MAX_KEY;i++){
E2MpMR if(hCallWnd
!=NULL){ aH_&=/-Tz
if(!IsWindow(hCallWnd)){ Dp8(L ]6
hCallWnd=NULL; S(pfd2^
HotKey=0; F+GQ l
HotKeyMask=0; <S
qbj;
KeyCount--; b~}}{fm&f
} s6I]H
} <OUApp H
} c1i7Rc{q
} >qCT#TY
0Ko,S(M_
BOOL CHookApp::InitInstance() TR |; /yJ
{ l-&f81W
AFX_MANAGE_STATE(AfxGetStaticModuleState()); -nW-I\d%
hins=AfxGetInstanceHandle(); i!NGX
InitHotkey(); :.<&Y=^
return CWinApp::InitInstance(); @cON"(
} \xt!b^d0
'py
k
int CHookApp::ExitInstance() V4 7Fp
{ vd~O:=)4
VerifyWindow(); WKG=d]5
UnInit(); -}%zus5
return CWinApp::ExitInstance(); Po5}Vh
} j[9B,C4
GCrN:+E0FJ
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file N`M5`=.
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) xK/`XY
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ wgrYZ^]
#if _MSC_VER > 1000 rO
NLbrj
#pragma once cMj<k8.{
#endif // _MSC_VER > 1000 x\*5A,w{c]
O1z>A
class CCaptureDlg : public CDialog =c|Bu^(Ctw
{ =xgW$c/yB
// Construction I
?1E}bv
public: |:\h3M
BOOL bTray; z, OMR`W
BOOL bRegistered; &HWH
UWB
BOOL RegisterHotkey(); Y, P-@(
UCHAR cKey; 7
ir T6O<.
UCHAR cMask; }5~;jN=k
void DeleteIcon(); | c;S'36
void AddIcon(); L2 I/h`n"
UINT nCount; 7Qo*u;fr
void SaveBmp(); ]SQ_*$`
CCaptureDlg(CWnd* pParent = NULL); // standard constructor @t_<oOI2
// Dialog Data kz#DBh!&
//{{AFX_DATA(CCaptureDlg) !n7?w@2a'
enum { IDD = IDD_CAPTURE_DIALOG }; /F\7_
CComboBox m_Key; p'H5yg3h
BOOL m_bControl; 8w{V[@QLn
BOOL m_bAlt; xe5>)\18-
BOOL m_bShift; dWI\VS 9
CString m_Path; w(vf>L6(
CString m_Number; 9`xq3EL2T
//}}AFX_DATA 2uB.0
// ClassWizard generated virtual function overrides `p!.K9r7
//{{AFX_VIRTUAL(CCaptureDlg) 4o%hH
public: toF@@%
virtual BOOL PreTranslateMessage(MSG* pMsg); (vY10W{
protected: L9x,G!
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Iv{}U\ u
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); a@%FwfIu
//}}AFX_VIRTUAL CSs3l
// Implementation V@$B>HeK
protected: 7B'0(70
HICON m_hIcon; Cnn,$R=/s
// Generated message map functions IRpCbTIXK
//{{AFX_MSG(CCaptureDlg) 9<R:)Df
virtual BOOL OnInitDialog(); o:?IT/>
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); C}M0KDF
afx_msg void OnPaint(); R8ZW1
afx_msg HCURSOR OnQueryDragIcon(); pM>.z9
virtual void OnCancel(); >9|Q,/b0
afx_msg void OnAbout(); 'HOt?lpu!
afx_msg void OnBrowse(); blLX ncyD
afx_msg void OnChange(); ztu N0}'
//}}AFX_MSG [\I\).
DECLARE_MESSAGE_MAP() P|G:h&
}; n|(Y?`(
#endif 7Q^t(
vZ*593C8
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file poM VB{U
#include "stdafx.h" _N<8!(|w
#include "Capture.h" Z
rvb
%
#include "CaptureDlg.h" P/^:IfuR
#include <windowsx.h> OrzDr
#pragma comment(lib,"hook.lib") akaQ6DIdG
#ifdef _DEBUG \;Ii(3+v;
#define new DEBUG_NEW J&lQ,T!?B
#undef THIS_FILE T'w=v-(J
static char THIS_FILE[] = __FILE__; zhFGMF1
#endif FQ );el'_V
#define IDM_SHELL WM_USER+1 f}o`3v*z
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {Bu^%JEn
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &Uzg&eB
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; A H`6)v<f
class CAboutDlg : public CDialog uYV#'%
{ ).k=[@@V
public: p`Ax)L\f
CAboutDlg(); M*%iMz
// Dialog Data nL\BB&
//{{AFX_DATA(CAboutDlg) [^aow-4z
enum { IDD = IDD_ABOUTBOX }; 4O2O0\o:
//}}AFX_DATA ,;UVQwY
// ClassWizard generated virtual function overrides Qp{{OjD
//{{AFX_VIRTUAL(CAboutDlg) '
R{ [Y)
protected: 4SmhtC
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C]{43
//}}AFX_VIRTUAL ptX;-'j(
// Implementation >i=mw5`D]
protected: |',MgA
//{{AFX_MSG(CAboutDlg) yY8q{\G
//}}AFX_MSG =EFF2M`F
DECLARE_MESSAGE_MAP() xqIt?v2c
}; $l Y
a:1-n%&F
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) o ;.j_
{ $n!saPpxS
//{{AFX_DATA_INIT(CAboutDlg) `j@2[XdHu
//}}AFX_DATA_INIT ij/ |~-!
} kAU[lPt*R
U ^[<G6<9]
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 7?e*b(vd
{ waldLb>7D
CDialog::DoDataExchange(pDX); ?PLf+S
//{{AFX_DATA_MAP(CAboutDlg) Hcuvu[)T"
//}}AFX_DATA_MAP )V} t(>V
} sAWUtJ
IrJCZsk
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ,{7Z OzA
//{{AFX_MSG_MAP(CAboutDlg) tyNT1F{
// No message handlers ~`(#sjr6KR
//}}AFX_MSG_MAP 9tWu>keu
END_MESSAGE_MAP() iq=<LOx
L3,p8-d9Z
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Beqzw0
: CDialog(CCaptureDlg::IDD, pParent) eNpGa0 eG
{ Y0
Ta&TYZ0
//{{AFX_DATA_INIT(CCaptureDlg) *e!0ZB3J
m_bControl = FALSE; ^ola5w D
m_bAlt = FALSE; k#&d`?X
m_bShift = FALSE; wm!Y5
m_Path = _T("c:\\"); gm\P`~+o
m_Number = _T("0 picture captured."); _|`S9Nms
nCount=0; 44b;]htv
bRegistered=FALSE; Z-.`JkKd8
bTray=FALSE; m onqaSF
//}}AFX_DATA_INIT 0DV
.1
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 5_9mA4gs@
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^,qi`Tk
} 7NE"+EP\{2
Rra<MOR
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) LW
8LD|@
{ f9?\Q'v8
CDialog::DoDataExchange(pDX); jIaAx_
//{{AFX_DATA_MAP(CCaptureDlg) Z~CL|=
DDX_Control(pDX, IDC_KEY, m_Key); s,)Z8H
DDX_Check(pDX, IDC_CONTROL, m_bControl); 9s7sn*aB#5
DDX_Check(pDX, IDC_ALT, m_bAlt); Gk
g)\ 3
DDX_Check(pDX, IDC_SHIFT, m_bShift); N*gnwrP{
DDX_Text(pDX, IDC_PATH, m_Path); )OS^tG[=
DDX_Text(pDX, IDC_NUMBER, m_Number); ~*@UQ9*p#
//}}AFX_DATA_MAP >/9f>d?w^
} !8(:G6Ne
9{]U6A*K0w
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) vlY83mU.
//{{AFX_MSG_MAP(CCaptureDlg) bk44qL;8
ON_WM_SYSCOMMAND() JmjqA Dex
ON_WM_PAINT() Ko|nF-r_
ON_WM_QUERYDRAGICON() K!;Z#$iw[
ON_BN_CLICKED(ID_ABOUT, OnAbout) UOC>H%r~M?
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) [W;iR_7T5
ON_BN_CLICKED(ID_CHANGE, OnChange) tN&4t
xB
//}}AFX_MSG_MAP W_8N?coM
END_MESSAGE_MAP() w3WBgH
slaYr`u
BOOL CCaptureDlg::OnInitDialog() ,4M7:=gf
{ Nr8#/H2f
CDialog::OnInitDialog(); ^}fc]ovV
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); CB]#`|f
ASSERT(IDM_ABOUTBOX < 0xF000); Q}C)az
CMenu* pSysMenu = GetSystemMenu(FALSE); :c)N"EJlI2
if (pSysMenu != NULL) Fuq ;4UcbL
{ dj>zy
CString strAboutMenu; ?S9? ?y/
strAboutMenu.LoadString(IDS_ABOUTBOX); fP# !ywgr%
if (!strAboutMenu.IsEmpty()) +"Flu.+['
{ ""q76cx
pSysMenu->AppendMenu(MF_SEPARATOR); 589hfET
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Dukvi;\
} jfF
} !tJQ75Hwv
SetIcon(m_hIcon, TRUE); // Set big icon 7uQiP&v
SetIcon(m_hIcon, FALSE); // Set small icon N@6+DHt
m_Key.SetCurSel(0); 4c^WQ>[
RegisterHotkey(); @)k/t>r(
CMenu* pMenu=GetSystemMenu(FALSE); j1D 1tn
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); @K.{o'
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); EIQ`?8KSR
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); UEHJ?
}
return TRUE; // return TRUE unless you set the focus to a control +?y ', Ir
} = Lt)15
bl yU53g
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 0P i+ (X
{ [}:;B$,
if ((nID & 0xFFF0) == IDM_ABOUTBOX) pZHx
{ >J(._K
CAboutDlg dlgAbout; F#Y9 @E
dlgAbout.DoModal(); )S"!)\4 b
} GWd71ZtFO
else {02$pO
{ rZ`+g7&^Fh
CDialog::OnSysCommand(nID, lParam); ,Y9bXC8+dU
} !y_4.&C{
} x9\z^GU%H
eLF xGZ Z
void CCaptureDlg::OnPaint() u|(;SY
{ hvW FzT5
if (IsIconic()) lEAf\T7
{ 8_$[SV$q
CPaintDC dc(this); // device context for painting F^4mO|
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); iepolO=
// Center icon in client rectangle k0r93xa
int cxIcon = GetSystemMetrics(SM_CXICON); +q*WY*gX
int cyIcon = GetSystemMetrics(SM_CYICON); f[1 s4Dp3-
CRect rect; 9!} ?}`'_
GetClientRect(&rect); "xWrYq'"
int x = (rect.Width() - cxIcon + 1) / 2; !U::kr=t
int y = (rect.Height() - cyIcon + 1) / 2; y[`>,?ns5
// Draw the icon N$ oQK(
dc.DrawIcon(x, y, m_hIcon); BN7]u5\7
} <8)cr0~zy>
else Rp^fY_
{ V_\9t8
CDialog::OnPaint(); POXd ,ON9
} xQUskjv/
} A4{14Y;?
) KvGJo)("
HCURSOR CCaptureDlg::OnQueryDragIcon() d!57`bVOd
{ _p*a`,tK
return (HCURSOR) m_hIcon; l6_dVK;s
} x&p.-Fi
)x5t']w`K
void CCaptureDlg::OnCancel() 4yK{(!&i+
{ +L0Jje>Az
if(bTray) f/PqkHF
DeleteIcon(); N=T 0Td
CDialog::OnCancel(); @bRKJPU9)
} e@h(Zwp
h-.xx4D
void CCaptureDlg::OnAbout()
^t}1$H
{ Lm&BT)*
CAboutDlg dlg; LA]UIM@
dlg.DoModal(); i2P:I A|@
} TI/5'Oke$
~Z`Cu~7
void CCaptureDlg::OnBrowse() '[Zgwz;z
{ I3qTSX-
CString str; x$hT+z6DUC
BROWSEINFO bi; 'vwu^u?
char name[MAX_PATH]; Y6 <.]H
ZeroMemory(&bi,sizeof(BROWSEINFO)); j
D kBe-`
bi.hwndOwner=GetSafeHwnd(); 6%^A6U
bi.pszDisplayName=name; P(%^J6[>
bi.lpszTitle="Select folder"; fK|P144
bi.ulFlags=BIF_RETURNONLYFSDIRS; 2WK c;?
LPITEMIDLIST idl=SHBrowseForFolder(&bi); +R8G*2
if(idl==NULL) oNhCa>)/
return; ^>/~MCyM.
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); XjXz#0nR
str.ReleaseBuffer(); b|-}?@&7&q
m_Path=str; i&TWIl8
if(str.GetAt(str.GetLength()-1)!='\\') W"Tj.oCUG
m_Path+="\\"; b($9gre>mI
UpdateData(FALSE); :u]QEZ@@
} ;#bDz}|\AN
6Vgxfic
void CCaptureDlg::SaveBmp() 7v&>d,
{ @?JFqwq!
CDC dc; 6$)FQ
U
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 8'PK}heBU
CBitmap bm; M3G ecjR
int Width=GetSystemMetrics(SM_CXSCREEN); mCe"=[
int Height=GetSystemMetrics(SM_CYSCREEN); w8D6j%C
bm.CreateCompatibleBitmap(&dc,Width,Height);
:al
,zxs
CDC tdc; ,!H`@Kl
tdc.CreateCompatibleDC(&dc); D"msD"
CBitmap*pOld=tdc.SelectObject(&bm); Q h{P>}
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); !^'6&NR#K
tdc.SelectObject(pOld); ]f~!Qk!I7r
BITMAP btm; dv Vz#
bm.GetBitmap(&btm); )g?ox{Hol
DWORD size=btm.bmWidthBytes*btm.bmHeight; ]JR2Av
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 1'!D
BITMAPINFOHEADER bih; F%f)oq`B
bih.biBitCount=btm.bmBitsPixel; _lDNYpv
bih.biClrImportant=0; |%oI,d=ycv
bih.biClrUsed=0; l(9AwVoAR|
bih.biCompression=0; ,8.$!Zia
bih.biHeight=btm.bmHeight; v|MT^.
bih.biPlanes=1; Cg(&WJw(ep
bih.biSize=sizeof(BITMAPINFOHEADER); IczMf%
bih.biSizeImage=size; 6e S~*
bih.biWidth=btm.bmWidth; LJ6L#es2
bih.biXPelsPerMeter=0; ~/qBOeU3
bih.biYPelsPerMeter=0; 3a|pk4M
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); h1H$3TpP
static int filecount=0; QHxof7
CString name; H$V`,=H
name.Format("pict%04d.bmp",filecount++); dT0>\9ZNr
name=m_Path+name; j#Qnu0D
BITMAPFILEHEADER bfh; ^ (s(4|
bfh.bfReserved1=bfh.bfReserved2=0; Z~w2m6;s
bfh.bfType=((WORD)('M'<< 8)|'B'); O!t=,F1j
bfh.bfSize=54+size; IhN^*P:Fo
bfh.bfOffBits=54; LzxO=+=9!q
CFile bf; 8|(],NyEJ
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ~{GTL_w
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 4jc?9(y%
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); vjzG
H*
bf.WriteHuge(lpData,size); D |=L)\
bf.Close(); UhJ{MUH`
nCount++; AhkDLm+
} yD Jy'Z_F{
GlobalFreePtr(lpData); Gr>CdB>~+
if(nCount==1) )FSEHQ
m_Number.Format("%d picture captured.",nCount);
2OpkRFFa
else +|x{?%.O
m_Number.Format("%d pictures captured.",nCount); G`;\"9t5h
UpdateData(FALSE); m[z$y
} (I`lv=R"j
B<ncOe
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) :`4F0
{ a`8]TD
if(pMsg -> message == WM_KEYDOWN) &Yo|Pj
{ FJ^\K+;
if(pMsg -> wParam == VK_ESCAPE) yh/JHo;
return TRUE; UM`{V5NG#
if(pMsg -> wParam == VK_RETURN) *$5p,m6G
return TRUE; /+*N.D'`t,
} h$}PQ
return CDialog::PreTranslateMessage(pMsg); 1]9w9!j
} eY-h<K)y
R={#V8D~
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f5p/cUzX
{ w5^k84vye
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ <5^m`F5
SaveBmp(); PD^G$LT
return FALSE; Y9gw
('\w
} I:HrBhI)wP
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 4AKr.a0q
CMenu pop; =j{tFxJ
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4l{$dtKbI
CMenu*pMenu=pop.GetSubMenu(0); 93Zij<bH?e
pMenu->SetDefaultItem(ID_EXITICON); =@pD>h/~
CPoint pt; c%WO#}r|
GetCursorPos(&pt); xXc>YTK'
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?68~ g<d,
if(id==ID_EXITICON) m"-kkH{I
DeleteIcon(); c1r+?q$f
else if(id==ID_EXIT) m)LI|
v
OnCancel(); AloL+eN@
return FALSE; ^_i)XdPU
} b;{"@b,Y
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Zk/ejhy0
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) `N&*+!O%
AddIcon(); ^{{a
v?h
return res;
q)f_!N
} Bz <I7h
W9pY=9]p+
void CCaptureDlg::AddIcon() nF_q{e7
{ AorY#oq
NOTIFYICONDATA data; 1Y&W>p
data.cbSize=sizeof(NOTIFYICONDATA); -EE'xh-zD
CString tip; `U b*rOMu
tip.LoadString(IDS_ICONTIP);
W~2,J4=
data.hIcon=GetIcon(0); M^Y[Y@U=p
data.hWnd=GetSafeHwnd(); i39ZBs@
strcpy(data.szTip,tip); <i4]qO(0u
data.uCallbackMessage=IDM_SHELL; /t<
&
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 2Wu`Dp;&l
data.uID=98; [\#ANA"
Shell_NotifyIcon(NIM_ADD,&data); G0|}s&$yL
ShowWindow(SW_HIDE); $,J0) ~
bTray=TRUE; ;Ce?f=4
} /Jc{aw
t$%<eF@w
void CCaptureDlg::DeleteIcon() }^0'IAXi
{ FwlDP
NOTIFYICONDATA data; 8'L:D
data.cbSize=sizeof(NOTIFYICONDATA); |!9xL*A
data.hWnd=GetSafeHwnd(); bS2g4]$'po
data.uID=98; {lH'T1^m
Shell_NotifyIcon(NIM_DELETE,&data); AT+l%%
ShowWindow(SW_SHOW); "?F[]8F.b
SetForegroundWindow(); V8):!
ShowWindow(SW_SHOWNORMAL); 2J{vfF
bTray=FALSE; )c&ya|h
} 6)ibXbH
xZ)K#\
void CCaptureDlg::OnChange() Y.) QNTh
{ d,N6~?B
RegisterHotkey(); -(F}=o'
} B1J,4
yf0v,]v[
BOOL CCaptureDlg::RegisterHotkey() u6F>o+Td)
{ as]M%|/-I
UpdateData(); Im\ ~x~{
UCHAR mask=0; z,$uIv}'@
UCHAR key=0; S6(48/
if(m_bControl) 'G~i;o 2
mask|=4; -3mIdZ
if(m_bAlt) v@ OELJX
mask|=2; 7Y[ q)lv
if(m_bShift) C4$P#DZT^
mask|=1; B*mZxY1
key=Key_Table[m_Key.GetCurSel()]; rh1PpsSc
if(bRegistered){ Qw5(5W[L
DeleteHotkey(GetSafeHwnd(),cKey,cMask); O|+ZEBP
bRegistered=FALSE; :e=7=|@7
} =oIt.`rf
cMask=mask; >J3mta3
cKey=key; \XmplG:
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); k kAg17 ^
return bRegistered; y>x"/jzF#
} iAQ[;M3p
&gruYZGK
四、小结 p\6}<b"p
b9vudr
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。