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:
6yRxb(
A"`(^#a 一、实现方法
4RU/y+[o Ne 9R
u'B6 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:
'.&z y# .-W_m7&} #pragma data_seg("shareddata")
ecgGl,{ HHOOK hHook =NULL; //钩子句柄
"Ca?liy UINT nHookCount =0; //挂接的程序数目
2 -
? static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
5qW*/ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
v\ gCgx=%j static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
-+#g.1UL/ static int KeyCount =0;
7<?~A6 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
tzFgPeo$; #pragma data_seg()
b6E,u*)" B \z4o\am% 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
SOPQg?'n=V %`Q<_LTU DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
g,seqh% j)[
wX BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
R9B !F{! 5 cKey,UCHAR cMask)
4lqowg0 {
q>X%MN y BOOL bAdded=FALSE;
h0)Wy>B=, for(int index=0;index<MAX_KEY;index++){
qp@:Zqz8 if(hCallWnd[index]==0){
wt@q+9: hCallWnd[index]=hWnd;
XCTee HotKey[index]=cKey;
I!;LT+b HotKeyMask[index]=cMask;
B{0m0-l bAdded=TRUE;
RO1xcCp KeyCount++;
(!0=~x|Z[ break;
5$ra4+k0 }
e2?7>? }
D; 0iNcit return bAdded;
<Hq|<^_K }
X(;,-7Jw //删除热键
T;u>]"S BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
!pNY`sw} {
8yDu(.Q BOOL bRemoved=FALSE;
1Lf:TQB for(int index=0;index<MAX_KEY;index++){
[|\JIr=of5 if(hCallWnd[index]==hWnd){
e2v[ma- if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
.CL\`` hCallWnd[index]=NULL;
6jRUkI-! HotKey[index]=0;
1x^(vn#= HotKeyMask[index]=0;
-$]Tn#`Fb bRemoved=TRUE;
U_UX * KeyCount--;
W&U
Nk, break;
=N9a!ii| }
fi2@`37PM }
n>Rt9 }
N:y3tpG return bRemoved;
6BJPQdqSl }
fdD?"z U0+Hk+ C>qKKLZ DLL中的钩子函数如下:
+##b}?S% $Qv+*%c LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
[Pu~kiN {
x_JCH7- BOOL bProcessed=FALSE;
<[H1S@{W if(HC_ACTION==nCode)
f3+@u2Pv
{
IR+dGqIjZb if((lParam&0xc0000000)==0xc0000000){// 有键松开
>!OD[9 switch(wParam)
>HUU`= SC {
WJ9= hr case VK_MENU:
8-?.Q"D7% MaskBits&=~ALTBIT;
Asn7;x0; break;
DFz,>DM; case VK_CONTROL:
oXc!JZ^ MaskBits&=~CTRLBIT;
L//Z\xr| break;
Wh:SZa| case VK_SHIFT:
['MG/FKuv MaskBits&=~SHIFTBIT;
5_@8g+~ break;
m q`EMOH default: //judge the key and send message
iR9
$E break;
_91g=pM }
8xQ5[Ov for(int index=0;index<MAX_KEY;index++){
<|M cE if(hCallWnd[index]==NULL)
0@yHT-Dy continue;
J>YwMl if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
cp0@wC#d {
8Vkw
vc SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
gsn3]^X bProcessed=TRUE;
:t6w+h
}
5'/Ney9N }
;[]{O5TB }
}jM&GH1 else if((lParam&0xc000ffff)==1){ //有键按下
iw\RQ
0 switch(wParam)
+s:!\(BM {
-v4kW0G case VK_MENU:
a
W`q MaskBits|=ALTBIT;
ngprTMO$& break;
h&+dIk\[3 case VK_CONTROL:
Ji_3*( MaskBits|=CTRLBIT;
] ZGP break;
bu[v[U4 case VK_SHIFT:
WHQg6r MaskBits|=SHIFTBIT;
+ RX{ break;
8F(lW)A n default: //judge the key and send message
[V ~(7U break;
/R&!92I0* }
hHsCr@i for(int index=0;index<MAX_KEY;index++){
0*MY4r|- if(hCallWnd[index]==NULL)
\ %Er%yv) continue;
(c ?OcwTH if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\f6SA{vR| {
XYtDovbv& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
N<1u,[+ bProcessed=TRUE;
|*W`}i }
{)j3Pn }
`H6-g=C }
?GPTJ#=j=] if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
31\l0Jg for(int index=0;index<MAX_KEY;index++){
:b[
[}' if(hCallWnd[index]==NULL)
O(8Px continue;
5:%xuJD if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
~6z<tyD^ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
{OP[Rrm //lParam的意义可看MSDN中WM_KEYDOWN部分
)UA};Fus }
k/A8| }
4k5X'&Q }
a9C8Q
l return CallNextHookEx( hHook, nCode, wParam, lParam );
Ah,X?0+ }
n}MW# :eJe *Ppb; 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:
eXY*l>B =m.Lw BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
FUic7> BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
=T'N6x5@ Vp*#,(_G: 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:
i>YD_#w *HFRG)[V LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
!%{/eQFT4 {
iB;EV8E if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
ES[H^}|Gi {
tLXwszR0r //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
;uj&j1 SaveBmp();
QFMR~6 ? return FALSE;
C?jk#T }
;/w-7O: …… //其它处理及默认处理
QH:k5V~ }
.UF]( @: u> "c8
-xG 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。
T
22tZp FES_:?.0 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。
W($}G_j[B1 4RCD<7 二、编程步骤
SJb+:L> egMl(~D 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";
h.PVR Awk `)Z"||8K 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
We&~]-b AW U~8;y' 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;
oc+TsVt v?e@`;-
< 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;
F?#^wm5TZ ru#,pJ=O( 5、 添加代码,编译运行程序。
LT7C>b -FRMal4Pg0 三、程序代码
Y5nj _xQJL Y 3W_Z ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
LpwjP4vWJ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
&)[?D< #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
hTZ& #if _MSC_VER > 1000
Lc.=CBQ #pragma once
7kX;|NA1 #endif // _MSC_VER > 1000
5}S~8 #ifndef __AFXWIN_H__
XpWcf ([ #error include 'stdafx.h' before including this file for PCH
{~J'J $hn8 #endif
coa+@g,w7# #include "resource.h" // main symbols
4D+S\S0bk class CHookApp : public CWinApp
/J''`Tf {
LpCJfQ public:
RCM;k;@8V CHookApp();
O# n<`;W // Overrides
jeb]3i=pw // ClassWizard generated virtual function overrides
]-ad\PI$ //{{AFX_VIRTUAL(CHookApp)
&QHZ]2%U public:
gR7in!8 virtual BOOL InitInstance();
+9LIpU&5 virtual int ExitInstance();
HK_Vk\e //}}AFX_VIRTUAL
= BcKWC //{{AFX_MSG(CHookApp)
.V~z6 // NOTE - the ClassWizard will add and remove member functions here.
jSi\/(E // DO NOT EDIT what you see in these blocks of generated code !
W:5uoO]=< //}}AFX_MSG
UnTnc6Bo7W DECLARE_MESSAGE_MAP()
G8bc\] };
RuyqB>[o LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
'W'['TV BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
vXA+o)*#/ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Qy0Zj$,Z BOOL InitHotkey();
"[A]tklP BOOL UnInit();
D,R"P }G #endif
>3aB{[[N \
@XvEx% //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
B^|^hZZ> #include "stdafx.h"
`Vph=`0 #include "hook.h"
CMu/n]?c #include <windowsx.h>
g$X4ZRSel #ifdef _DEBUG
b&wyp@k #define new DEBUG_NEW
73C7g<
Mx #undef THIS_FILE
Fsdp"X. static char THIS_FILE[] = __FILE__;
iO$Z?Dyg9 #endif
-/^a2_d[ #define MAX_KEY 100
[f ._w~ #define CTRLBIT 0x04
3[_zz;Y*d #define ALTBIT 0x02
HNXMM #define SHIFTBIT 0x01
LVHIQ9 #pragma data_seg("shareddata")
b*5Yy/U HHOOK hHook =NULL;
Gl am(V1 UINT nHookCount =0;
{3)^$F=T static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
!H)Cua) static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
]2zzY::Sd= static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
d2\#Zlu< static int KeyCount =0;
oGIh:n7 q+ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Nqy)jfyex #pragma data_seg()
_;zIH5 H HINSTANCE hins;
Z [[AmxE'l void VerifyWindow();
T:<mme3v BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
"UM*(& //{{AFX_MSG_MAP(CHookApp)
YRU1^=v // NOTE - the ClassWizard will add and remove mapping macros here.
@m`1Vq?O // DO NOT EDIT what you see in these blocks of generated code!
:t)<$dtf[ //}}AFX_MSG_MAP
]h3{MTr/ END_MESSAGE_MAP()
3'*}ZDC $M:Ru@Du2 CHookApp::CHookApp()
0,{tBo {
"pA24Ze // TODO: add construction code here,
yb/v?q?Fk // Place all significant initialization in InitInstance
RyuI2jEy }
NzBX2 I_.Jo `lK~ CHookApp theApp;
qI=j>x LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
=|j~*6Hd {
ta BOOL bProcessed=FALSE;
b^s>yN if(HC_ACTION==nCode)
w *Txc} {
[}*xxy if((lParam&0xc0000000)==0xc0000000){// Key up
0?80V' switch(wParam)
o],z/MPL {
c.?+rcnq case VK_MENU:
>Hd Pcsl L MaskBits&=~ALTBIT;
$ca>bX] break;
Id}@ case VK_CONTROL:
6+.8nx:9X MaskBits&=~CTRLBIT;
o[Gp *o\ break;
+M s`C)f case VK_SHIFT:
}L|cg2y MaskBits&=~SHIFTBIT;
}f;cA break;
26[. te9 default: //judge the key and send message
h.t2 ;O, b break;
35}]U= }
PrQs_tNi for(int index=0;index<MAX_KEY;index++){
,6Ua+\| if(hCallWnd[index]==NULL)
?S2!'L continue;
yN/Uyhq if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
i
w(4!,4~ {
2EAY`}Rl6. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
K0 6 E: bProcessed=TRUE;
UmNh0nS }
g[D`. }
}"\jB }
IEj=pI else if((lParam&0xc000ffff)==1){ //Key down
S(NUuu}S switch(wParam)
VT:m!<^
{
b&g`AnYT case VK_MENU:
kN8?.V%Utw MaskBits|=ALTBIT;
x7!YA>
break;
&60#y4 case VK_CONTROL:
.>^iU} MaskBits|=CTRLBIT;
cERmCe|/CG break;
tj<0q<is case VK_SHIFT:
p+.{"% MaskBits|=SHIFTBIT;
6>e YG<y{ break;
\!J9| default: //judge the key and send message
]
RLEyDB break;
_[p@V_my }
O{&wqV5m" for(int index=0;index<MAX_KEY;index++)
7a#zr_r {
B,NHy
C1i if(hCallWnd[index]==NULL)
!fT3mI6u\ continue;
_usi~m if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<&87aDYz {
r$/.x6g// SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
R1j)0b6cQ% bProcessed=TRUE;
K[Ao_v2g }
=>u9k:('9 }
];7/DM#Np }
wPRs.(]_ if(!bProcessed){
Zt{\<5j for(int index=0;index<MAX_KEY;index++){
)an,-EIX% if(hCallWnd[index]==NULL)
V+dFL9 continue;
=7P(T`j if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
#fkOm
Y7X SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
~'3hK4 }
V+MhS3VD }
1}DUe.a }
>G<.^~o return CallNextHookEx( hHook, nCode, wParam, lParam );
nv-_\M }
oP`yBX 2I
qvd BOOL InitHotkey()
y|O)i
I/g {
:d`8:gv? if(hHook!=NULL){
>^V3Z{; nHookCount++;
+ug[TV return TRUE;
F3,djZq }
t^(#~hx else
o ImW hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
v>]^wH>/" if(hHook!=NULL)
eF%IX nHookCount++;
WC
ZDS> return (hHook!=NULL);
uL[%R2 }
:1(UC}v BOOL UnInit()
7iM;X2=7} {
% m0x] if(nHookCount>1){
69tT'U3vb$ nHookCount--;
7J$5dFV2 return TRUE;
wG2-,\: }
Q{))+'s2h BOOL unhooked = UnhookWindowsHookEx(hHook);
'h~I#S4! if(unhooked==TRUE){
EHC^ [5 nHookCount=0;
#{L
!o5 hHook=NULL;
R$xk cg2( }
{V*OYYI`R return unhooked;
k w]m7T }
eHy.<VX i<]Y0_?s BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
#&jr9RB {
}5qjGD BOOL bAdded=FALSE;
r")zR, for(int index=0;index<MAX_KEY;index++){
2xJT!lN if(hCallWnd[index]==0){
~!G&K`u hCallWnd[index]=hWnd;
$h|rd+}, HotKey[index]=cKey;
8G0DuMI5 HotKeyMask[index]=cMask;
TR([u bAdded=TRUE;
JHCV7$RS KeyCount++;
lS:R## break;
B>TI dQ }
avI }
@N0(%o& return bAdded;
{x8UL7{ }
$}/Q%r :.,3Zw{l BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
3ZKaqwK {
9X2l H~C BOOL bRemoved=FALSE;
^"?b!=n! for(int index=0;index<MAX_KEY;index++){
{<_9QAS if(hCallWnd[index]==hWnd){
T2$V5RyX if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
.Iret: hCallWnd[index]=NULL;
!agtgS$qII HotKey[index]=0;
/\B[lRn HotKeyMask[index]=0;
$EuWQq7OI2 bRemoved=TRUE;
:%hxg KeyCount--;
~"ij,Op,3 break;
3M&IMf,/@ }
<(%cb.^c=N }
LbeMP }
0- 'f1 1S return bRemoved;
,B<Tt|' }
}nW) + ,UD,)ZPf[ void VerifyWindow()
ecI[lB {
E*t0ia8 for(int i=0;i<MAX_KEY;i++){
&_!g|- if(hCallWnd
!=NULL){ }813.U
if(!IsWindow(hCallWnd)){ 8/|~E
hCallWnd=NULL; N>A*N,+
HotKey=0; #(`@D7S"
HotKeyMask=0; h""a#n)q}`
KeyCount--; FSvtiNW<
} I@f">&^
} Cl+TjmOV\`
} q;kN+NK64
} |5}~n"R5
Kb# }f/
BOOL CHookApp::InitInstance() v$`AN4)}
{ sDH|k@K
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ')ErXLP_
hins=AfxGetInstanceHandle(); &dV|~xA6N
InitHotkey(); }0({c~z\
return CWinApp::InitInstance(); ]bq<vI%
} 8 '2lc
PG1#Z?_
int CHookApp::ExitInstance() s)e;
c<(/
{ p5KM(N6f
VerifyWindow(); f]BG`rJX
UnInit(); E&/D%}Wl
return CWinApp::ExitInstance(); "5-S:+
} hOX$|0i
1MV\
^l_
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [Q/')5b
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 35;)O -
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ BHwQB2t gc
#if _MSC_VER > 1000 cs ?@Ri=g
#pragma once jG3}V3|.
#endif // _MSC_VER > 1000 up~l4]b+
X`ifjZ9}d
class CCaptureDlg : public CDialog t:X[Blw3$
{ GLe(?\Ug=
// Construction *mM+(]8US
public: bT@7&
BOOL bTray; V;Zp3Qo!
BOOL bRegistered; fNi&1J-/
BOOL RegisterHotkey(); Hy<4q^3$G
UCHAR cKey; ] =jnt
UCHAR cMask; 3:rH1vG.m
void DeleteIcon(); j/bebR}X
void AddIcon(); sBuVm<H
UINT nCount; <[^nD>t_
void SaveBmp(); yiUJ!m
CCaptureDlg(CWnd* pParent = NULL); // standard constructor >NN |vj
// Dialog Data #4{f2s[j6
//{{AFX_DATA(CCaptureDlg) &/J[P dSb$
enum { IDD = IDD_CAPTURE_DIALOG }; mmXLGLMd
CComboBox m_Key; |n;gGR\
BOOL m_bControl; YZCPS6PuE
BOOL m_bAlt; O,_2djd
BOOL m_bShift; icF -`m
CString m_Path; _c|>m4+X
CString m_Number; 7cn"@h rJ
//}}AFX_DATA ;<#fZ0(l;
// ClassWizard generated virtual function overrides hGH{Xp[mW
//{{AFX_VIRTUAL(CCaptureDlg) FeS6>/
public: -/aDq?<<
virtual BOOL PreTranslateMessage(MSG* pMsg); /h0<0b?i
protected: '[p~|
mX
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3MC| O5R4
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); lX`)Avqa
//}}AFX_VIRTUAL ,z)7rU`
// Implementation @T1/S&F=
protected: i\B>J?Q\
HICON m_hIcon; 0+O)~>v
// Generated message map functions V|{ )P@Q
//{{AFX_MSG(CCaptureDlg) #kX=$Bzk
virtual BOOL OnInitDialog(); 0.nS306
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); q+32|k>)
afx_msg void OnPaint(); ~Xnq(}?ok
afx_msg HCURSOR OnQueryDragIcon(); dCcV$BX,K
virtual void OnCancel(); P_t8=d
afx_msg void OnAbout(); \1RQ),5 %]
afx_msg void OnBrowse(); cW),Y|8
afx_msg void OnChange(); !+ IxPn
//}}AFX_MSG U<eVLfSij
DECLARE_MESSAGE_MAP() 5.xvOi|.
}; <27B*C M
#endif h^$>{0"
B| %=<1?
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file amGQ!$]
%#
#include "stdafx.h" 0i$jtCCL(
#include "Capture.h" kT UQ8U
#include "CaptureDlg.h" 9U58#
#include <windowsx.h> /U)w:B+p/g
#pragma comment(lib,"hook.lib") @l&5 |Cia
#ifdef _DEBUG 6.~(oepu
#define new DEBUG_NEW P]+^^U
#undef THIS_FILE Tp<=dH%$%"
static char THIS_FILE[] = __FILE__; ]k{cPK
#endif ZzI^*Nyg
#define IDM_SHELL WM_USER+1 M!=v"C#
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); quf,ZK5
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G4s!q1H
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *E.{i
class CAboutDlg : public CDialog (EUX>IJ
{ K;-:C9@
public: vsoj] R$C
CAboutDlg(); [_qBp:_j?s
// Dialog Data Z|d_G}
//{{AFX_DATA(CAboutDlg) }tx~y-QQ
enum { IDD = IDD_ABOUTBOX }; /Os)4yH\
//}}AFX_DATA sXl7
// ClassWizard generated virtual function overrides 8pDJz_F!{
//{{AFX_VIRTUAL(CAboutDlg) .Rc&EO
protected: [O [N _z
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "SyyOD
)WA
//}}AFX_VIRTUAL nH% /
// Implementation y~1UU3k5
protected: Ft`#]=IS
//{{AFX_MSG(CAboutDlg) pWps-e
//}}AFX_MSG e7/J:n$
DECLARE_MESSAGE_MAP() ;pb~Zk/[,w
}; 8.jd'yp*J
V* fDvr0
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Dw[w%uz
{ GFlsI-*`
//{{AFX_DATA_INIT(CAboutDlg) fQuphMOl6
//}}AFX_DATA_INIT fylW)W4C
} fdd3H[
]$nJn+85@b
void CAboutDlg::DoDataExchange(CDataExchange* pDX) s&y
{ 4_t
aCK
CDialog::DoDataExchange(pDX); =q[3/'2V$?
//{{AFX_DATA_MAP(CAboutDlg) zK:/
1
//}}AFX_DATA_MAP
|ki#MtCp
} gNLjk4H,S[
X^9_'T9
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) .1|'9@]lj4
//{{AFX_MSG_MAP(CAboutDlg) ?e]4HHgU]
// No message handlers orzdq
//}}AFX_MSG_MAP p//">l=Ps
END_MESSAGE_MAP() Os@ofnC
ENJ]
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) wqE ]o=
k
: CDialog(CCaptureDlg::IDD, pParent) P).
@o.xl
{ )CdglPK
//{{AFX_DATA_INIT(CCaptureDlg) O:lD>A4{
m_bControl = FALSE; MQ\:/]a
m_bAlt = FALSE; 2E2J=Do
m_bShift = FALSE; 6tG9PG98q9
m_Path = _T("c:\\"); ,=o q)Fm]
m_Number = _T("0 picture captured."); z0g]nYN%
nCount=0; c
q3CN@
bRegistered=FALSE; (eO0Ic[c
bTray=FALSE; A2rr>
//}}AFX_DATA_INIT j*QY_Ny*
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 J4lE7aFDA~
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); lrq !}\aX
} 2[M:WZ.1
&g)
`
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) m(g$T
{ B}P,sFghw
CDialog::DoDataExchange(pDX); /B1<N}
//{{AFX_DATA_MAP(CCaptureDlg) X[Y!=e4z
DDX_Control(pDX, IDC_KEY, m_Key); >t*zY~R.
DDX_Check(pDX, IDC_CONTROL, m_bControl); 7qW:^2y
DDX_Check(pDX, IDC_ALT, m_bAlt); Sk;IAp#X9
DDX_Check(pDX, IDC_SHIFT, m_bShift); msY"Y*4
DDX_Text(pDX, IDC_PATH, m_Path); Vaq=f/
DDX_Text(pDX, IDC_NUMBER, m_Number); _FdWV?
//}}AFX_DATA_MAP 8zVXQ!'
} &]vd7Q.t
JxD@y}ZYE
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 'Fc&"(!||
//{{AFX_MSG_MAP(CCaptureDlg) X% _~9'#%
ON_WM_SYSCOMMAND() 8<.KWr
ON_WM_PAINT() #v(+3Hp
ON_WM_QUERYDRAGICON() $yCj80m\
ON_BN_CLICKED(ID_ABOUT, OnAbout) =C#,aoa!
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 4vBbP;ELWq
ON_BN_CLICKED(ID_CHANGE, OnChange)
mH8s'F
//}}AFX_MSG_MAP &|{ K*pNa
END_MESSAGE_MAP() 6f1;4Jfp
*ZaK+ B
BOOL CCaptureDlg::OnInitDialog() g_n=vO('X
{ e2B~j3-?z
CDialog::OnInitDialog(); j./bVmd.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); eyAg\uuih
ASSERT(IDM_ABOUTBOX < 0xF000); M
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CMenu* pSysMenu = GetSystemMenu(FALSE); MQG$J!N
if (pSysMenu != NULL) 2d3wQ)2
{ SxH}/I|W
CString strAboutMenu; ,#WXAAmm
strAboutMenu.LoadString(IDS_ABOUTBOX); m,up37-{
if (!strAboutMenu.IsEmpty()) %eT/:I
{ x!YfZ*
pSysMenu->AppendMenu(MF_SEPARATOR); qHHWe<}OT
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #4cuNX5m%
} ( I,V+v+{Y
} ;H\,w/E9
SetIcon(m_hIcon, TRUE); // Set big icon #d|.BxH
SetIcon(m_hIcon, FALSE); // Set small icon 1^Caz-
m_Key.SetCurSel(0); d[$1:V
RegisterHotkey(); ^R<= }
CMenu* pMenu=GetSystemMenu(FALSE);
y"9TS,lmK
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 9Hc#[Ml
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 9MXauTKI
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); }W|CIgF*
return TRUE; // return TRUE unless you set the focus to a control gJF;yW4
} BO
h
Nxt/R%(
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Hss{Sb(
{ RNt3az
if ((nID & 0xFFF0) == IDM_ABOUTBOX) "+XO[WGc
{ +ubO-A?
CAboutDlg dlgAbout; 9f"6Jw@F
dlgAbout.DoModal(); Wq>j;\3b3
} mU\$piei
else r% B5@+{so
{ xMuy[)b
CDialog::OnSysCommand(nID, lParam); ]}5jX^j
} }'X}!_9w>
} `$#64UZ>U1
-#Wc@\;
void CCaptureDlg::OnPaint() K1+,y1c
{ h2BD?y
if (IsIconic()) Bo~wD|E2
{ 4< H-ol
CPaintDC dc(this); // device context for painting [R Ch7FE23
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); , 1`eH[
// Center icon in client rectangle I}8F3_b,#
int cxIcon = GetSystemMetrics(SM_CXICON); yNN2}\[.
int cyIcon = GetSystemMetrics(SM_CYICON); oNEU?+
CRect rect; ]
2b@mX
GetClientRect(&rect); ?3zx?>sG
int x = (rect.Width() - cxIcon + 1) / 2; 4l3N#U0Q
int y = (rect.Height() - cyIcon + 1) / 2; $==hr^H
// Draw the icon hi
]+D= S
dc.DrawIcon(x, y, m_hIcon); MBwp{ET!p
} Fvv6<E
else om/gk4S2
{ $8eq&_gJ
CDialog::OnPaint(); [Q$"+@jw
} -pjL7/ gx
} tx.YW9xD
ER|5_
HCURSOR CCaptureDlg::OnQueryDragIcon() *yX_dgC>[
{ y-Ol1R3:c#
return (HCURSOR) m_hIcon; hZJ Nh,,w
} -51L!x}1c
}=L
>u>cP
void CCaptureDlg::OnCancel() BF@VgozW
{ '%~zu]f'
if(bTray) (<<eHf,@
DeleteIcon(); +22[ h@
CDialog::OnCancel(); nrxN_0 R%
} CRx:3u!:
M,{F/Yu
void CCaptureDlg::OnAbout() :g\qj? o
{ 9c?izp A
CAboutDlg dlg; U$J]^-AS
dlg.DoModal(); yqYX<<!V
} RoiMvrJQP
XH*^#c
void CCaptureDlg::OnBrowse() 0GG;o[<
{ x
Dr^&rC
CString str; ~/Ry=8
BROWSEINFO bi; +tA rH
C]
char name[MAX_PATH]; ~/.&Z`ls
ZeroMemory(&bi,sizeof(BROWSEINFO)); 0FW=8hFp,
bi.hwndOwner=GetSafeHwnd(); JBg>E3*N
bi.pszDisplayName=name; [[|;Wr}2
bi.lpszTitle="Select folder"; =o-qu^T^u
bi.ulFlags=BIF_RETURNONLYFSDIRS; C1nQZtF R
LPITEMIDLIST idl=SHBrowseForFolder(&bi);
ew0 )
if(idl==NULL) U?rfE(!
return; 2Hd6
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH));
8~I>t9Q+
str.ReleaseBuffer(); h?O-13v
m_Path=str; :,u+[0-S
if(str.GetAt(str.GetLength()-1)!='\\') F 4hEfO3
m_Path+="\\"; p;H1,E:Re#
UpdateData(FALSE); q<UqGj7#
} Op0
#9W
^:q(ksssY
void CCaptureDlg::SaveBmp() ht-6_]+ME
{ kOjq LA
CDC dc; qI"mW@G~H
dc.CreateDC("DISPLAY",NULL,NULL,NULL); &0lNj@/
CBitmap bm; kP6r=HH@
int Width=GetSystemMetrics(SM_CXSCREEN); Rza\n8
int Height=GetSystemMetrics(SM_CYSCREEN); nOB
]?{X
bm.CreateCompatibleBitmap(&dc,Width,Height); mB
:lp=c`
CDC tdc; (+U!#T]'D
tdc.CreateCompatibleDC(&dc); ML]?`qv '
CBitmap*pOld=tdc.SelectObject(&bm); %NBD^gF
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 8[Qw8z5-
tdc.SelectObject(pOld); xv ja
BITMAP btm; w_Ls.K5"
bm.GetBitmap(&btm); 0$ (}\hMLt
DWORD size=btm.bmWidthBytes*btm.bmHeight; J'7Oxjlg
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ?L
$KlF Y
BITMAPINFOHEADER bih; M aEh8*
bih.biBitCount=btm.bmBitsPixel; Vz,WPm$I
bih.biClrImportant=0; WGO=@jkf
bih.biClrUsed=0; RHBEC@d[}
bih.biCompression=0; FJ!>3V;}
bih.biHeight=btm.bmHeight; ^1g6(k'
bih.biPlanes=1; *rbH|o 8
bih.biSize=sizeof(BITMAPINFOHEADER); #A/jGv^
bih.biSizeImage=size; ~<eiWDf
bih.biWidth=btm.bmWidth; 3!
+5MsR+
bih.biXPelsPerMeter=0; oT_,k}L IX
bih.biYPelsPerMeter=0; OW.ckYt%
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); J>'o,"D
static int filecount=0; HOw][}M_w
CString name; [Cs2H8=#
name.Format("pict%04d.bmp",filecount++); }FK6o
6
name=m_Path+name; vZKo&jUk
BITMAPFILEHEADER bfh; Jk~T.p?tF
bfh.bfReserved1=bfh.bfReserved2=0; "pH+YqJ$
bfh.bfType=((WORD)('M'<< 8)|'B'); e9:l
bfh.bfSize=54+size; $`Ou *
bfh.bfOffBits=54; {L+?n*;CA
CFile bf; l(`w]=t&
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ bT;C8i4b\H
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); g&za/F
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 1idEm*3&(
bf.WriteHuge(lpData,size); :{fsfZXXr
bf.Close(); q4Z\y
nCount++; J3'"-,Hv
} QVP
$e`4
GlobalFreePtr(lpData); CeZ5Ti?F
if(nCount==1) QA%GK4F70
m_Number.Format("%d picture captured.",nCount); |9Y9pked8
else z(]*'0)P
m_Number.Format("%d pictures captured.",nCount); %1 v)rg
y
UpdateData(FALSE); N7E[wOP
} s4Wk2*7Mq
0 #q_LB
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) h{! @^Q
{ NBeGmC|
if(pMsg -> message == WM_KEYDOWN) m}XI?[!s
{ XJlun l)(K
if(pMsg -> wParam == VK_ESCAPE) Jd%#eD*k9
return TRUE; V^0*S=N
if(pMsg -> wParam == VK_RETURN) $'&5gFr9
return TRUE; vxwctJ&
} }:BF3cH> 0
return CDialog::PreTranslateMessage(pMsg); USbiI%
} 06ueE\@Sg
)~5`A*Ku
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $DMeUA\av
{ a"v D+r7Ol
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ dFUsQ_]<
SaveBmp(); IOJ fv8
return FALSE; s<5t}{x
} prwyP
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ C*KRu`t
CMenu pop; \nJrjHA
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); X+*| nvq]
CMenu*pMenu=pop.GetSubMenu(0); 1|gEY;Ru
pMenu->SetDefaultItem(ID_EXITICON); &&m%=i.qK
CPoint pt; ,wq.C6;&
GetCursorPos(&pt); `@`CZg
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ('gjfl
if(id==ID_EXITICON) MAR;k?d
DeleteIcon(); :+;F" _
else if(id==ID_EXIT) |e9}G,1
OnCancel(); h?TE$&CL?
return FALSE; YZoudX'"
} Q!"Li
LRESULT res= CDialog::WindowProc(message, wParam, lParam); nc3 1X
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) :;JJvYIs
AddIcon(); +28FB[W
return res; <y!BO
} x3vz4m[
B!Qdf8We
void CCaptureDlg::AddIcon() Bb1dH/8
{ C[pAa 8
NOTIFYICONDATA data; }&!rIU
data.cbSize=sizeof(NOTIFYICONDATA); -_2=NA?t
CString tip; RuHJk\T+
tip.LoadString(IDS_ICONTIP); a-Y K*
data.hIcon=GetIcon(0); p<![JeV
data.hWnd=GetSafeHwnd(); wRuJein#
strcpy(data.szTip,tip); YsTfv1~z#
data.uCallbackMessage=IDM_SHELL; zX5p'8-
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; d8x$NW-s
data.uID=98; O" z=+79q
Shell_NotifyIcon(NIM_ADD,&data); ;bZ)q
ShowWindow(SW_HIDE); Ek4aC3
bTray=TRUE; ?d_Cy\G
} v5*SoUOF
1.';:/~(
void CCaptureDlg::DeleteIcon() ;[6u79;I
{ Bg#NB
NOTIFYICONDATA data; VE GUhI/d
data.cbSize=sizeof(NOTIFYICONDATA); OixQlAb{
data.hWnd=GetSafeHwnd(); Ck[Z(=b$$:
data.uID=98; & XrV[d[>
Shell_NotifyIcon(NIM_DELETE,&data); KDY~9?}TM
ShowWindow(SW_SHOW); <H 3}N!
SetForegroundWindow();
:Ct}||9/
ShowWindow(SW_SHOWNORMAL); c\R!z&y~
bTray=FALSE; 9(H8MUF0{
} H\ NO4=
Kj-`ru
void CCaptureDlg::OnChange() MjLyB^M
{ ]`|bf2*eA
RegisterHotkey(); ` "9Y.KU
} !E*-\}[
(C. 1'<]
BOOL CCaptureDlg::RegisterHotkey() #cApk
{ 3FS:]|oC
UpdateData(); ha(hG3C
UCHAR mask=0; HFf|
>&c&
UCHAR key=0; ]])i"oew
if(m_bControl) HDC`g
mask|=4; PCFm@S@Q
if(m_bAlt) #}A!Bk
mask|=2; {~=[d`t
if(m_bShift) FS20OD
mask|=1; b?Vu9!
key=Key_Table[m_Key.GetCurSel()]; Y@pa+~[{h3
if(bRegistered){ 9J1&g(?>-
DeleteHotkey(GetSafeHwnd(),cKey,cMask); EKDv3aFQZ#
bRegistered=FALSE; *rqih_j0
} )\s:.<?EQ
cMask=mask; 9t)t-t#P;
cKey=key; QGsUG_/_P
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); .Oim7JQ8
return bRegistered; {UwJg
} s~TYzfA
KR z\ct|
四、小结 i1sc oxX3\
O,DA{> *m
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。