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:
AwUc{h l<
S2E HmE& 一、实现方法
_-]!;0EIV YM`pNtQ 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:
~AanU1U< QO{=Wi- #pragma data_seg("shareddata")
!y-2# HHOOK hHook =NULL; //钩子句柄
PgLS\_B UINT nHookCount =0; //挂接的程序数目
"F$o!Vk static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
[fi'=Cb static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
ShJK&70O static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
cEc,eq| static int KeyCount =0;
F,M"/hnPT static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
XcMJD(! #pragma data_seg()
,6;xr'[o* _sR9 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
1/ pA/UVO _]xt65TL DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
oL'1Gm@X? .3<IOtD= BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Jh4&Qh|t cKey,UCHAR cMask)
x$GsDV {
xDJ+BQ<1A BOOL bAdded=FALSE;
l(#ke for(int index=0;index<MAX_KEY;index++){
yW^IN8fm if(hCallWnd[index]==0){
{R-82% X hCallWnd[index]=hWnd;
vX0"S HotKey[index]=cKey;
ZQ~myqx,+L HotKeyMask[index]=cMask;
[W$Z60?RR bAdded=TRUE;
Hp} KeyCount++;
6_<s=nTX break;
c~UAr k S }
$i:||L^8p }
ouVjZF@kS return bAdded;
;,=h59` }
z5`8G =A //删除热键
EeJqszmH BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
zk5=Opmvh {
"6N~2q,SW BOOL bRemoved=FALSE;
4su_;+] for(int index=0;index<MAX_KEY;index++){
s`=/fvf. if(hCallWnd[index]==hWnd){
'B (eMnLg if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
LuP?$~z hCallWnd[index]=NULL;
Sf&?3a+f HotKey[index]=0;
jD/7/G* HotKeyMask[index]=0;
XDkS
^9 bRemoved=TRUE;
M6]0Y@@> KeyCount--;
/Pn.)Lxfl break;
{(Og/[ }
*SkiFEoD }
j\'+wVyo }
px|>v8 return bRemoved;
1Vf78n }
+K;Y+
K&;2 X#DL/#z k ')5L_$ DLL中的钩子函数如下:
J4G> E.8 lMwk.# LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
[.;%\>Qk< {
Kr/h`RM BOOL bProcessed=FALSE;
qA/#IUi)1 if(HC_ACTION==nCode)
mT6q}``vtG {
Fkcx+d if((lParam&0xc0000000)==0xc0000000){// 有键松开
Jf?S9r5 Q switch(wParam)
5'X74` {
K)/!&{7n}a case VK_MENU:
%e
Sm&` MaskBits&=~ALTBIT;
lMBX!9z break;
\ I^nx+l case VK_CONTROL:
-4e)N*VVu MaskBits&=~CTRLBIT;
9K ;k% break;
N&fW9s} case VK_SHIFT:
*O+R|Cdp/ MaskBits&=~SHIFTBIT;
f4'El2>-86 break;
v`S2M default: //judge the key and send message
T+;H#& break;
K[uY+!'1 }
ZU-4})7uSB for(int index=0;index<MAX_KEY;index++){
3J'73)y if(hCallWnd[index]==NULL)
hIVI\U, continue;
3cOY0Z#T if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
dUoWo3r= {
E+}GxFG-: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
;GE26Ymqly bProcessed=TRUE;
&@YFje6Lcm }
d&[iEU }
AozmO }
eC6>yD6D else if((lParam&0xc000ffff)==1){ //有键按下
\fK47oV switch(wParam)
-(\1r2
Y {
K`Bq(z?/ case VK_MENU:
[x!i*
rW3 MaskBits|=ALTBIT;
(;0$i?3\ break;
euV $2Fg case VK_CONTROL:
/!=U+X MaskBits|=CTRLBIT;
nW|'l^& break;
2J;kD2"! case VK_SHIFT:
tYs8)\{ MaskBits|=SHIFTBIT;
onnI ! break;
t_jyyHxoZ: default: //judge the key and send message
N[qA2+e$Z break;
vG ]GQ# }
x37/cu for(int index=0;index<MAX_KEY;index++){
_urG_~q if(hCallWnd[index]==NULL)
c ]>DI&$;J continue;
6OL41g' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
lSH ZV
Fd {
XkPv*%Er8 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
XC|*A$x, bProcessed=TRUE;
)v%l0_z{ }
F:M>z= }
6xH;:B)d }
fyM3UA\U if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
&Nc[$H7< for(int index=0;index<MAX_KEY;index++){
)@}A
r if(hCallWnd[index]==NULL)
fL!V$]HNt continue;
,~(|p` if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
T/[f5?p SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
lij B#1<8* //lParam的意义可看MSDN中WM_KEYDOWN部分
tNK^z7Dm }
A LXUaE. }
Q |
}
,{k<JA{ return CallNextHookEx( hHook, nCode, wParam, lParam );
8y$5oD6g9 }
m</]D WJ f:]u`ziM 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
WgE@8 9 NW
z9C=y BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
di7A/B BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Da-u-_~ B@-|b 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
hZcmP"wgC1 k+FMZ,D| LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Le*`r2 {
0|g[o:;fl_ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
NX?}{'f {
5XDgs|8 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
8tU>DJ}0 SaveBmp();
mge#YV:: return FALSE;
n_v02vFAHT }
hM?`x(P …… //其它处理及默认处理
i8K_vo2Z) }
14mf}"z\ >K\3*]>J3 o&~dGG4J 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
;; :">@5 )X/*($SuA 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。
vX ?aB!nkw _=pWG^a 二、编程步骤
KyT uF 0!pJ5q ,A 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";
wfE^Sb3 ~p:?QB>1]
2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
6
jmrD yE#g5V& 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;
4sTMgBzw Tr~sieL 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;
rWA6XDM7 I?B,sl_w 5、 添加代码,编译运行程序。
80C(H!^ kVd5,Qd 三、程序代码
0Z"s_r}h `?l3Ct* ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
6D|p Qs #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
/hL\,x2 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
g0PT8]8 #if _MSC_VER > 1000
Xx_tpC? #pragma once
A_Rrcsl4 #endif // _MSC_VER > 1000
tAERbiH
#ifndef __AFXWIN_H__
'3^Q14`R #error include 'stdafx.h' before including this file for PCH
k@yh+ v5 #endif
,]ga[ #include "resource.h" // main symbols
=NadAyv class CHookApp : public CWinApp
?-f,8Z|h {
=J](.78 public:
*r;xw CHookApp();
Vz{>cSz# // Overrides
O5zE {# // ClassWizard generated virtual function overrides
H(b)aw^(% //{{AFX_VIRTUAL(CHookApp)
{?Od{d9 public:
b]T@gJ4H= virtual BOOL InitInstance();
YScvyh?E virtual int ExitInstance();
>p0KFU //}}AFX_VIRTUAL
t8P PE //{{AFX_MSG(CHookApp)
/ 2xSNalC // NOTE - the ClassWizard will add and remove member functions here.
l-<`m#/v // DO NOT EDIT what you see in these blocks of generated code !
Sm)u9 //}}AFX_MSG
V7EQ4Om:It DECLARE_MESSAGE_MAP()
TN\|fzj };
R:M,tL-l LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
V,Q4n%h1. BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
6kN:* BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
0Qnd6mb BOOL InitHotkey();
\9`#]#1bx5 BOOL UnInit();
-U>y #endif
`<U5z$^QTw ?F_)- //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
H]&gW/= #include "stdafx.h"
Or8kp/d #include "hook.h"
E$A3|rjnoN #include <windowsx.h>
~Wei|,w'< #ifdef _DEBUG
/`3#4=5- #define new DEBUG_NEW
FQk!d$BG #undef THIS_FILE
?{6s58Q{ static char THIS_FILE[] = __FILE__;
I`T1Pll #endif
i7 w(S3a #define MAX_KEY 100
H}/05e #define CTRLBIT 0x04
Wpr
,jN8b #define ALTBIT 0x02
uR$i48} #define SHIFTBIT 0x01
.t= #pragma data_seg("shareddata")
; b*i3*!g HHOOK hHook =NULL;
Y%@hbUc}x9 UINT nHookCount =0;
\vRd} static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
GSi>l,y' static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
$=)gpPT static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
?IF)+] static int KeyCount =0;
du_4eB static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
G69GoT #pragma data_seg()
>P=Q #;v HINSTANCE hins;
rzUlO5?R= void VerifyWindow();
P6\6?am BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
3TS_-l //{{AFX_MSG_MAP(CHookApp)
!Ms[eB // NOTE - the ClassWizard will add and remove mapping macros here.
yCP4r6X0 // DO NOT EDIT what you see in these blocks of generated code!
/TV=$gB` //}}AFX_MSG_MAP
Dvc&RG END_MESSAGE_MAP()
e2cP
*J 6;iJ*2f5V CHookApp::CHookApp()
`XKVr {
l1'6cLT` // TODO: add construction code here,
3I $>uR // Place all significant initialization in InitInstance
9t$]X>} }
%%JMb=!%2 R#W&ery CHookApp theApp;
~b)74M/ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Zsx3/} {
,R2U`EO; BOOL bProcessed=FALSE;
LT VF8-v if(HC_ACTION==nCode)
b~w=v_[(I {
t e,[f if((lParam&0xc0000000)==0xc0000000){// Key up
Y`BRh9Sa switch(wParam)
}t%W1UJ {
lz<]5T| case VK_MENU:
ypdT&5Mqb! MaskBits&=~ALTBIT;
m@Rtlb break;
y7)(LQRE
{ case VK_CONTROL:
]uQqn]+I! MaskBits&=~CTRLBIT;
mJ}opy!{; break;
=1.9/hW case VK_SHIFT:
bt$)Xu<R MaskBits&=~SHIFTBIT;
~}"]&%Q{J break;
?LK 2g default: //judge the key and send message
[yS#O\$'e break;
\ck+GW4& }
(Pbg[AY for(int index=0;index<MAX_KEY;index++){
y3G
`> if(hCallWnd[index]==NULL)
%$5H!!~o continue;
r]Lc9dL if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~Z'w)!h {
sN6N >{ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
{{yZ@>o6 bProcessed=TRUE;
D5,P)[ }
j+-P :xvP }
>znRyQ~bM }
-E4XIn else if((lParam&0xc000ffff)==1){ //Key down
Sa1l=^ switch(wParam)
iyta;dw9 {
>>{FzR case VK_MENU:
%9oYw9H! MaskBits|=ALTBIT;
O1'm@
q) break;
2lVHZ\G case VK_CONTROL:
"Wo,'8{v MaskBits|=CTRLBIT;
NnT g3:. break;
i0jBZW"_1$ case VK_SHIFT:
Bi,;lR5
MaskBits|=SHIFTBIT;
GH1"xR4! break;
umi5Wb< default: //judge the key and send message
5L,}e<S$ break;
sarq`%zrk }
',^+bgs5 for(int index=0;index<MAX_KEY;index++)
Uyx!E4pl( {
~@.%m"<. if(hCallWnd[index]==NULL)
3&&9_`r&_ continue;
d;mx<i=/ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
A][fLlpr {
?';OD3- SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Vv1|51B bProcessed=TRUE;
?L&|Uw+ }
$-}e; V Zb }
*^%Q0mU[ }
I/gjenUK if(!bProcessed){
-!W<DJ* for(int index=0;index<MAX_KEY;index++){
9}a_:hAy/ if(hCallWnd[index]==NULL)
3I\n_V< continue;
7\FXz'hA if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
V-'K6mn; SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
fjk\L\1 }
.
\ }
10!wqyj& }
,<BbpIQ2o return CallNextHookEx( hHook, nCode, wParam, lParam );
*}k;L74| }
^sN ( U8qtwA9t BOOL InitHotkey()
^V$Ajt {
ivDGZI9 if(hHook!=NULL){
M])dJ9&e nHookCount++;
;{h CF return TRUE;
+6wiOHB` }
,C%eBna4Iq else
EI!6MC) hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Um#Wu]i if(hHook!=NULL)
PxH72hBS nHookCount++;
D?XM,l+ return (hHook!=NULL);
JRo?s~Ih }
FFdBtB BOOL UnInit()
b4^`DHRu6 {
;q N+^;,2 if(nHookCount>1){
*HEuorl nHookCount--;
>D201&*G% return TRUE;
L|bwZ,M=}? }
q[`j`8YY!R BOOL unhooked = UnhookWindowsHookEx(hHook);
g~(E>6Y if(unhooked==TRUE){
2^8%>, nHookCount=0;
cuy1DDl hHook=NULL;
zg-2C>(6a }
jck}" N return unhooked;
ys 5&PZg* }
Vz6Qxd{m3 aaD;jxT&M| BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
UG=K|OXWJ {
"Ph^BUAb BOOL bAdded=FALSE;
NaX for(int index=0;index<MAX_KEY;index++){
#>Zzf if(hCallWnd[index]==0){
;2B{ 9{ hCallWnd[index]=hWnd;
@E:,lA HotKey[index]=cKey;
?-^~f HotKeyMask[index]=cMask;
OS8q( 2z?s bAdded=TRUE;
(?nCyHC%g KeyCount++;
_h}kp\sps break;
`ZC<W]WYX/ }
qucq,Yw }
x c{hC4^V return bAdded;
x?&$ ci }
,}K<*t[I [jmd BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
!.d@L6 {
9k{PBAP BOOL bRemoved=FALSE;
2RSt)3!}, for(int index=0;index<MAX_KEY;index++){
;G%R<Z if(hCallWnd[index]==hWnd){
,\NFt`]j if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
y*X_T,K8 hCallWnd[index]=NULL;
VkZ7# HotKey[index]=0;
nqLA}u4IM HotKeyMask[index]=0;
}iuWAFZbGS bRemoved=TRUE;
j_Yp>=+[ KeyCount--;
I_RsYw break;
qgfi\/$6 }
o"*AtGR+" }
812$`5l }
t. ;LnrY return bRemoved;
~?(N }
rS;Dmm 7Hs%Cc" void VerifyWindow()
EY tQw(!Q {
fk&8]tK4 for(int i=0;i<MAX_KEY;i++){
^pUHKXihD if(hCallWnd
!=NULL){ >p"c>V& 8
if(!IsWindow(hCallWnd)){ ?!+MM&c-n
hCallWnd=NULL; [UH||qW
HotKey=0; NX}<*b/
HotKeyMask=0; 0=?<y'=
KeyCount--; @Z12CrJ
}
P
Y
} t2)rUWg
} 5k.oW=
} ~;N^g4s
>Z5gSs0
BOOL CHookApp::InitInstance() :\|SQKD
{ 9E6_]8rl
AFX_MANAGE_STATE(AfxGetStaticModuleState()); `E>1>'
hins=AfxGetInstanceHandle(); *6>.!&
InitHotkey(); >G%o,9i
return CWinApp::InitInstance(); dUhY\v oQ
} ajEjZ6
@<elq'2
int CHookApp::ExitInstance() Fx2bwut.K
{ yPal<c
VerifyWindow(); 3qf
Ym}d
UnInit(); sc}~8T
return CWinApp::ExitInstance(); <_-hRbS
} X<I+&Zi
/#)/;
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xsD($_
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) j-lfMEa$o
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ qHrc9fB
#if _MSC_VER > 1000 +8Rg F
#pragma once p"KFJ
#endif // _MSC_VER > 1000 T:=lz:}I
fSokm4]vg
class CCaptureDlg : public CDialog ]jo1{IcI
{ 0E3[N:s
// Construction 0"pAN[=K@
public: !]=d-RGNe
BOOL bTray; sG92XJ
BOOL bRegistered; 6;ixa
hZV
BOOL RegisterHotkey(); TOB]IrW
UCHAR cKey; {A05u3}
UCHAR cMask; 'ZDp5pCC;
void DeleteIcon(); oY933i@l)P
void AddIcon(); v]B3m
UINT nCount; G?Q3/y(
void SaveBmp(); N/MUwx;P
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 8; 0A
g
// Dialog Data e?8HgiP-
//{{AFX_DATA(CCaptureDlg) '/^qJ7eb
enum { IDD = IDD_CAPTURE_DIALOG }; 7+\+DujE$
CComboBox m_Key; =4FXBPoQK
BOOL m_bControl; KbA?7^zo`
BOOL m_bAlt; n$$SNWgM
BOOL m_bShift; tp6 3@L|Q
CString m_Path; n(;|q&3
CString m_Number; tFp Ygff<
//}}AFX_DATA s~5[![1
K
// ClassWizard generated virtual function overrides x-^`~p
//{{AFX_VIRTUAL(CCaptureDlg) {y=j?lD
public: K/IWH[
virtual BOOL PreTranslateMessage(MSG* pMsg); wk5s)%V
protected: ^hZ0IM
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )b)-ZS7
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); wea-zN
//}}AFX_VIRTUAL b4[bL2J$h1
// Implementation H9YW
protected: Y^$X*U/q%U
HICON m_hIcon; Y 0d<~*
// Generated message map functions t gI{`jS%
//{{AFX_MSG(CCaptureDlg) TFlet"ge=
virtual BOOL OnInitDialog(); JB<Sl4
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); um!J]N^
afx_msg void OnPaint(); Rh_np
afx_msg HCURSOR OnQueryDragIcon(); O$_)G\\\m
virtual void OnCancel(); ]>=}*=
afx_msg void OnAbout(); /|C*
afx_msg void OnBrowse(); -zOdU}91Ao
afx_msg void OnChange(); bk;?9%TW
//}}AFX_MSG F8jd'OR
DECLARE_MESSAGE_MAP() f4 P8Oz
}; $w2u3-
#endif |}BLF
\Q0[?k
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 2mVD_ s[`
#include "stdafx.h" Enum/O5
#include "Capture.h" %4et&zRC
#include "CaptureDlg.h" J^SdH&%Z
#include <windowsx.h> a_f~N1kq
#pragma comment(lib,"hook.lib") cW@Zd5&0S
#ifdef _DEBUG +ElfZ4
#define new DEBUG_NEW D$
dfNiCH
#undef THIS_FILE J??-j
static char THIS_FILE[] = __FILE__; g
jDh?I
#endif MQ5R O;RY
#define IDM_SHELL WM_USER+1 T@2#6Tffo
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l;R%= P?'F
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
M+||rct
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; q&s3wDl/
class CAboutDlg : public CDialog ,(d)Qg
{ Wbr|_W
public: !t$'AoVBq
CAboutDlg(); 8 OY 3A
// Dialog Data ]zE;Tw.S
//{{AFX_DATA(CAboutDlg) [^Os kJ4
enum { IDD = IDD_ABOUTBOX }; *W,]>v0%T
//}}AFX_DATA .}t~'*D
// ClassWizard generated virtual function overrides ]O+Ma}dxz:
//{{AFX_VIRTUAL(CAboutDlg) uki#/GzaO
protected: +ga k#M"n\
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Rdvk
ml@@
//}}AFX_VIRTUAL vQosPS_2L
// Implementation \?[v{WP)
protected: LClNxm2X
//{{AFX_MSG(CAboutDlg) cv998*|X:
//}}AFX_MSG Ktb\ b w
DECLARE_MESSAGE_MAP() >`Y.+4mE
}; ^Cu\VV
Aw$x;3y
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) zi|+HM
{ F
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//{{AFX_DATA_INIT(CAboutDlg) `q}I"iS
//}}AFX_DATA_INIT |=Eo?Q_
} i
UCXAWP
D!{Y$;
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "& ])lz[u
{ z>58dA@f
CDialog::DoDataExchange(pDX); N60rgSzI
//{{AFX_DATA_MAP(CAboutDlg) @e(o129
//}}AFX_DATA_MAP +giyX7BPJ
} {@6=Q 6L
G`SUxhC k
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) K0-ypU*P
//{{AFX_MSG_MAP(CAboutDlg) HePUWL'
// No message handlers >80;8\
//}}AFX_MSG_MAP HW3 }uP\c
END_MESSAGE_MAP()
)j9SGLo
hL/)|N~
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) K&POyOvT
: CDialog(CCaptureDlg::IDD, pParent) .`HYA*8_
{ E27vR 7
//{{AFX_DATA_INIT(CCaptureDlg) W5EDVPur
m_bControl = FALSE; ?5C!<3gM)
m_bAlt = FALSE; LPZF)@|`
m_bShift = FALSE; V=R 3)GC
m_Path = _T("c:\\"); P\yDa*m
m_Number = _T("0 picture captured."); {P*pkc
nCount=0; \|H!~) h$1
bRegistered=FALSE; %eX{WgH
bTray=FALSE; zMj#KA1
//}}AFX_DATA_INIT En~5"yW5>]
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 wW7eT~w
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); f!\lg
} `|6'9
YLqGRE`W
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) $bW3_rl%X
{ L^E[J`
CDialog::DoDataExchange(pDX); Z,sv9{4r
//{{AFX_DATA_MAP(CCaptureDlg) -}nxJH )
DDX_Control(pDX, IDC_KEY, m_Key); VCY\be
DDX_Check(pDX, IDC_CONTROL, m_bControl); 13 =A
DDX_Check(pDX, IDC_ALT, m_bAlt); [$qyF|/K`n
DDX_Check(pDX, IDC_SHIFT, m_bShift); v25R_""~
DDX_Text(pDX, IDC_PATH, m_Path); )m`<H>[Eb=
DDX_Text(pDX, IDC_NUMBER, m_Number); R n}l6kbM
//}}AFX_DATA_MAP
gp5_Z-me
} *,e:]!*
]JCvyz
H
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) zz+$=(T:M
//{{AFX_MSG_MAP(CCaptureDlg) KC/=TSSXd.
ON_WM_SYSCOMMAND() -m)X]]~C
ON_WM_PAINT() pOGeruu?
ON_WM_QUERYDRAGICON() v=0(~<7B
ON_BN_CLICKED(ID_ABOUT, OnAbout) a][f
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) G9Y#kBr
ON_BN_CLICKED(ID_CHANGE, OnChange) .X@FXx&
//}}AFX_MSG_MAP )Ub_@)X3%l
END_MESSAGE_MAP() kh
{p%<r{
;T"zV{;7BR
BOOL CCaptureDlg::OnInitDialog() Wr<j!>J6Ki
{ G/b^|;41
CDialog::OnInitDialog(); YM1'L\^
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); p2ogn}`
ASSERT(IDM_ABOUTBOX < 0xF000); LCZ\4g05
CMenu* pSysMenu = GetSystemMenu(FALSE); &|Bc7+/P
if (pSysMenu != NULL) A#Iyb){Y
{ tz5e"+Tz
CString strAboutMenu; W=j[V
Oq
strAboutMenu.LoadString(IDS_ABOUTBOX); /M|262%
if (!strAboutMenu.IsEmpty()) kjg~n9#T
{ 4 8:>NW
pSysMenu->AppendMenu(MF_SEPARATOR); xDG2ws=@D
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); G}:w@}h/
} p~SClaR3H
} wfNk=)^$
SetIcon(m_hIcon, TRUE); // Set big icon RP~|PtLw_
SetIcon(m_hIcon, FALSE); // Set small icon tmv&U;0Z
m_Key.SetCurSel(0); Fpm|_f7
RegisterHotkey(); y`\@N"Cf
CMenu* pMenu=GetSystemMenu(FALSE); fa++MNf}3
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); :Pvzl1
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); gYNjzew'
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); JG" R\2
return TRUE; // return TRUE unless you set the focus to a control ey2S#%DF]
} 5 xppKt
6N",-c
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) z2MWN\?8
{ :# .<[
if ((nID & 0xFFF0) == IDM_ABOUTBOX) u])b,9&En
{ W~zbm]
CAboutDlg dlgAbout; v9:9E|,U+
dlgAbout.DoModal(); le1}0L
} C69q&S,
else HW=C),*]cR
{ 6eT5ktf
CDialog::OnSysCommand(nID, lParam); ^Y@\1fX 4e
} SLkhCR
} VRI0W`
OHeT,@(mh
void CCaptureDlg::OnPaint() [Grxw[(_:
{ T+*%?2>q"
if (IsIconic()) 6%t1b M
a
{ !D@ZYK;
CPaintDC dc(this); // device context for painting i&5XF
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); H=g`hF]`
// Center icon in client rectangle G+%zn|
int cxIcon = GetSystemMetrics(SM_CXICON); M@`;JjtSA
int cyIcon = GetSystemMetrics(SM_CYICON); I$<<(VWH
CRect rect; CS@FYO
GetClientRect(&rect); T?x[C4wf+
int x = (rect.Width() - cxIcon + 1) / 2; 8dO!
int y = (rect.Height() - cyIcon + 1) / 2; =-8bsV/l
// Draw the icon SSPHhAeH8
dc.DrawIcon(x, y, m_hIcon); nSW=LjrO~<
} eCqHvMp
else K%a%a6k`
{ t/cY=Wp
CDialog::OnPaint(); $"FQj4%d
} jBgP$g
} PK{acen
jF0jkj1&/[
HCURSOR CCaptureDlg::OnQueryDragIcon() EH256f(&
{ gu0j.XS^
return (HCURSOR) m_hIcon; \MbB#
} eM$s v9?
>+JqA7K
void CCaptureDlg::OnCancel() ?\t#1"d
{ }q $5ig
if(bTray) eO?p*"p" F
DeleteIcon(); oXb;w@:
CDialog::OnCancel(); Fx;QU)1l3
} $})g?Q
P!H_1RwXKC
void CCaptureDlg::OnAbout() *1v[kWa?
{ Y"~gw~7OD
CAboutDlg dlg; H,DM1Z9rz
dlg.DoModal(); {@+Ty]e
} 0s/w,?
0\[Chja
void CCaptureDlg::OnBrowse() E^.n c~
{ MRb-H1+Xf
CString str; +z9Q-d%O
BROWSEINFO bi; BQ=PW|[
char name[MAX_PATH]; g;2?F[8Th
ZeroMemory(&bi,sizeof(BROWSEINFO)); n/Sw P
bi.hwndOwner=GetSafeHwnd(); K_RjX>q%N
bi.pszDisplayName=name; "JlpU-8[0@
bi.lpszTitle="Select folder"; sE:M@`2L
bi.ulFlags=BIF_RETURNONLYFSDIRS; `%+Wz0(K
LPITEMIDLIST idl=SHBrowseForFolder(&bi); _H j!2 '
if(idl==NULL) QR%mj*@Wle
return; 2w["aVr
=
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \.-}adKg
str.ReleaseBuffer(); Nv(9N-9r
m_Path=str; ~8GF Q ph
if(str.GetAt(str.GetLength()-1)!='\\') )%`^xR
m_Path+="\\"; fA+,TEB~d
UpdateData(FALSE); k@/sn(x
} fh](K'P#^
p-Kz-+A [
void CCaptureDlg::SaveBmp() CIb2J)qev
{ ti
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CDC dc; >8k_n
dc.CreateDC("DISPLAY",NULL,NULL,NULL); GBRa.;Kk
CBitmap bm; f@Zszt
int Width=GetSystemMetrics(SM_CXSCREEN); Q36qIq_0e
int Height=GetSystemMetrics(SM_CYSCREEN); V:VO[e<e
bm.CreateCompatibleBitmap(&dc,Width,Height); m9.{[K"
CDC tdc; ] lrWgm
tdc.CreateCompatibleDC(&dc); n[G &ksQI
CBitmap*pOld=tdc.SelectObject(&bm); "Y~:|?(@-
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); c_vqL$Dl
tdc.SelectObject(pOld); cc~O&?)i
BITMAP btm; )N7Y^CN~
bm.GetBitmap(&btm); 4\Tl\SZ?
DWORD size=btm.bmWidthBytes*btm.bmHeight; sj HrPs e
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); _*1`@
BITMAPINFOHEADER bih; L)@?e?9
bih.biBitCount=btm.bmBitsPixel; J|~MC7#@q
bih.biClrImportant=0; ?}kG`q
bih.biClrUsed=0; umt.Um.m2
bih.biCompression=0; YVHm{A1b0
bih.biHeight=btm.bmHeight; j$?{\iXZ
bih.biPlanes=1; C-\S/yd
bih.biSize=sizeof(BITMAPINFOHEADER); AlAY iUw{
bih.biSizeImage=size; 9}PhN<Gd
bih.biWidth=btm.bmWidth; i*/Yz*<
bih.biXPelsPerMeter=0; f;W|\z'
bih.biYPelsPerMeter=0; 7?GIS '
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); nV -mPyfL8
static int filecount=0;
^,/RO5
CString name; PIdikA
name.Format("pict%04d.bmp",filecount++); ?4q4J8j
name=m_Path+name; p<,*3huj
BITMAPFILEHEADER bfh; M$/|)U'W
bfh.bfReserved1=bfh.bfReserved2=0; 1*9U1\z
bfh.bfType=((WORD)('M'<< 8)|'B'); }]lr>"~y}
bfh.bfSize=54+size; d$ x"/A]<
bfh.bfOffBits=54; gm igsXQ
CFile bf; gG*X^Uo
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ZWc]$H?
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); P)Rh=U
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); j g8fU
bf.WriteHuge(lpData,size); 57umx`m
bf.Close(); +n{#V;J
nCount++; .QZaGw=,z
} _qw?@478
GlobalFreePtr(lpData); i36eBjT
if(nCount==1) SL#0kc0x
m_Number.Format("%d picture captured.",nCount); _"bHe/'CI
else &jslyQ#
m_Number.Format("%d pictures captured.",nCount); pe] A5\4c
UpdateData(FALSE); n1ly
y0%u
} 7UVzp v
s$Z
_48
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) _B/dWA,P
{ >z%&xgOa
if(pMsg -> message == WM_KEYDOWN) f!I[>&n
{ psg)*'r
if(pMsg -> wParam == VK_ESCAPE) Fcd3H$Na;
return TRUE; ST:A<Da"
if(pMsg -> wParam == VK_RETURN) IC1NKn<k
return TRUE; g#Sl %Y
} %s|}Fz->
return CDialog::PreTranslateMessage(pMsg); 0
q}*S~
} vms|x wb
a
yCY~=i
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?[g=F <r
{ "Zl5<
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ fI{&#~f4C
SaveBmp(); 5,_u/5Y4
return FALSE; YQHw1
} iOU6V
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `6lr4Kk @R
CMenu pop; D~hg$XzK
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6kpg+{;
CMenu*pMenu=pop.GetSubMenu(0); * w?N{.
pMenu->SetDefaultItem(ID_EXITICON); kYG/@7f/
CPoint pt; QPx_-
GetCursorPos(&pt); gtk7)Uh
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); x=b7': nQ
if(id==ID_EXITICON) tzZ`2pSh
DeleteIcon(); Cs9.&Y
else if(id==ID_EXIT) F`gi_;c
OnCancel(); VH9dleZ
return FALSE; ^l9N48]|?
} D8Ykg >B;&
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Nl^;A><u
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) $ M`hh{ -
AddIcon(); _jLL_GD
return res; o]yl;I
} w80oXXs[#
,l!Ta"
void CCaptureDlg::AddIcon() `A w^H!
{ .
$BUw
NOTIFYICONDATA data; =Je[c,&j$?
data.cbSize=sizeof(NOTIFYICONDATA); tnH2sHby
CString tip; Al}6q{E9+8
tip.LoadString(IDS_ICONTIP); `UD/}j@
data.hIcon=GetIcon(0); _ FpTFfB
data.hWnd=GetSafeHwnd(); ad*m%9Y1Q
strcpy(data.szTip,tip); wSa)*]%
data.uCallbackMessage=IDM_SHELL; &dM.
d!
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 41`n1:-]
data.uID=98; R=gb'
Shell_NotifyIcon(NIM_ADD,&data); lR )67a
ShowWindow(SW_HIDE); ,?>s>bHV
bTray=TRUE; X:HacYqtC
} >/l? g5{
i,>khc
void CCaptureDlg::DeleteIcon() K#6P}tf
{ em,u(#)&
NOTIFYICONDATA data; "i y
data.cbSize=sizeof(NOTIFYICONDATA); %zG;Q@
data.hWnd=GetSafeHwnd(); 8(pp2r lR
data.uID=98; a1EOJ^}0
Shell_NotifyIcon(NIM_DELETE,&data); &"yx<&c}
ShowWindow(SW_SHOW); t;W0"ci9
SetForegroundWindow(); \.MR""@y`{
ShowWindow(SW_SHOWNORMAL); `[f*Zv w
bTray=FALSE; 39:bzUIF
} PVe
xa|aaX
@.$| w>>T
void CCaptureDlg::OnChange()
1eS&&J5
{ ]Lf{Jboo
RegisterHotkey();
e?0l"
} >3p\m
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BOOL CCaptureDlg::RegisterHotkey() ZP@
$Q%up
{ >0/i[k-dk
UpdateData(); cG[l!Z
UCHAR mask=0; 0)Uce=t`
UCHAR key=0; (SpX w,:
if(m_bControl) 4{y)TZ
mask|=4; \UPjf]&
if(m_bAlt) e7^mmm
mask|=2; ~xkeuU
if(m_bShift) J1( 9QN[w
mask|=1; S0zD"T
key=Key_Table[m_Key.GetCurSel()]; ]~9tYn
if(bRegistered){ ZGexdc%
DeleteHotkey(GetSafeHwnd(),cKey,cMask); (?n=33}Ci
bRegistered=FALSE; 8EW_V$>R
} ck:T,F{}
cMask=mask; [%q@]\U$s
cKey=key; *=8JIs A>!
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); n6wV.?8
return bRegistered; {m4b(t`xw
} |]jb& M
J"!vu.[
四、小结 Sdp&jZY
x-$&g*<
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。