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:
d2ofxfpg+
&5/JfNe3 一、实现方法
Orc>.~+f%A ew"m!F# 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:
9&(.x8d,a NhtEW0xCr #pragma data_seg("shareddata")
K|~AA"I; HHOOK hHook =NULL; //钩子句柄
+GPd UINT nHookCount =0; //挂接的程序数目
Qrz*Lvle h static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
!>|`ly$6 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
sVD([`Nmc static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
tnRJ#[Io static int KeyCount =0;
t!savp static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
fSC.+,qk #pragma data_seg()
7X:hIl (lWKy9eTy` 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
&`sR){R /p[y1 DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
iXnx1w eb7UoZw BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
%rFllb7 cKey,UCHAR cMask)
}Y$VB%&Hy {
Wlxk BOOL bAdded=FALSE;
lzI/\% for(int index=0;index<MAX_KEY;index++){
7\ ZL if(hCallWnd[index]==0){
tQ6| PV hCallWnd[index]=hWnd;
fcn_<Yh0W HotKey[index]=cKey;
=~;zVP HotKeyMask[index]=cMask;
`bi
k/o=% bAdded=TRUE;
{!tOI KeyCount++;
]N_140N~ break;
7Fc | }
l85CJ+rg }
_BCT.ual return bAdded;
~vkud+r }
cxk=|
?l //删除热键
I>8Bc BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
1(D1}fcul {
L7[X|zmy*x BOOL bRemoved=FALSE;
ar=hx+ for(int index=0;index<MAX_KEY;index++){
}"g@E-]N if(hCallWnd[index]==hWnd){
6pe4Ni7I2 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
6l=M;B7:i hCallWnd[index]=NULL;
Dj/Q1KY$m HotKey[index]=0;
bwT"$Ee HotKeyMask[index]=0;
mrX}\p bRemoved=TRUE;
Z|f^nH#-C KeyCount--;
Yr Preuh break;
s')!<E+z\t }
yFa&GxSq }
]IL3 $eR }
9eksCxFg return bRemoved;
I(F1S,7 }
30e(4@!4vW aj%
`x4eA 1Q3%!~<\s DLL中的钩子函数如下:
VK"[=l Uia)5z z8 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
E]D4'] {
V:$[~)k8 BOOL bProcessed=FALSE;
%Td+J`|U+ if(HC_ACTION==nCode)
^2(";.m {
Nj"_sA
p if((lParam&0xc0000000)==0xc0000000){// 有键松开
wpJ^}+kF switch(wParam)
c|8KT {
v#zfs' case VK_MENU:
WllCcD1 MaskBits&=~ALTBIT;
=W97|BIW, break;
zhD`\&G. case VK_CONTROL:
1WZKQeOo MaskBits&=~CTRLBIT;
'bd=,QW break;
,5%aP% case VK_SHIFT:
"dFdOb"O- MaskBits&=~SHIFTBIT;
LKoM\g( break;
y$"~^8"z default: //judge the key and send message
C]{V%jU break;
_~(MA-l }
7zi^{] for(int index=0;index<MAX_KEY;index++){
!'c6 Hs if(hCallWnd[index]==NULL)
H>Iet}/c continue;
NiU tH if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
oC;l5v< {
U{.+*e18 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
cftn`:(&8 bProcessed=TRUE;
?Ix'2v }
-+Awm{X_@ }
%K/G+ }
-6*OF.Ag` else if((lParam&0xc000ffff)==1){ //有键按下
ph5xW<VNP switch(wParam)
}r\SP3 {
Z{|.xg sY case VK_MENU:
6H . L!tUI MaskBits|=ALTBIT;
"m\UqQGX break;
5O4&BxQ~} case VK_CONTROL:
Q?I"J$]&L MaskBits|=CTRLBIT;
Xk7$?8r4& break;
%`<`z yf case VK_SHIFT:
S]e~)IgO MaskBits|=SHIFTBIT;
:@z5& h break;
8u~\]1( default: //judge the key and send message
c Gaz$=/ break;
jd*%.FDi{ }
LQ&d|giA for(int index=0;index<MAX_KEY;index++){
f T+n-B if(hCallWnd[index]==NULL)
5IB:4zx^h continue;
f%"_U' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
%<#$:Qb. {
0e5-\a SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
* y"GgI bProcessed=TRUE;
b~jvmcr }
K]=>F }
m@
'I|!^ }
]FnrbQ| if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
5/eS1NJ@ for(int index=0;index<MAX_KEY;index++){
} C2i#;b if(hCallWnd[index]==NULL)
qytGs@p_ continue;
(nP* if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
4)I/\ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Xrzh*sp //lParam的意义可看MSDN中WM_KEYDOWN部分
>kLH6. }
eG)/&zQ8 }
?jM7C} }
bz,cfc;?$ return CallNextHookEx( hHook, nCode, wParam, lParam );
7g<`wLAH }
e4_aKuA jKi*3-& 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:
K]]rOF 7!840 :a?+ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
u5)A+.v BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
X52jqXjg !JQ~r@j 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:
~v,KI["o BU?MRcHC LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
m
?tnk?oX {
+(k)1kCMn if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
,,j=RG_ {
/gy:#-2Gy //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
q^+NhAMz SaveBmp();
O,,n return FALSE;
f*&JfP }
)mO;l/,0 …… //其它处理及默认处理
w`!foPE }
:/[ZgreN6 \6
0WP-s /!uBk3x: 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。
*A9{H>Vq 7T;RXrT 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。
vo<#sa^,j 3a[(GW _ 二、编程步骤
={0{X9t?'j 9i[2z:4HJ 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";
bQQ/7KM kb\v}gfiD/ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
9wJmX<Rm d<m>H$\Dm 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
10a*7 L d_qVk4h\ 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
e Em0c]]9 `i^1U O 5、 添加代码,编译运行程序。
Q+M3Pqy TB[2!ZW 三、程序代码
H 6<@ E1v<-UPbA ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
@Iatlz*W #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
07Cuoqt2 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
%4^/.) Q #if _MSC_VER > 1000
-dN;\x #pragma once
iDxgAV f* #endif // _MSC_VER > 1000
:Lzj'Ij #ifndef __AFXWIN_H__
o=2`N2AL #error include 'stdafx.h' before including this file for PCH
3AL=*qq #endif
=gyK*F(RK #include "resource.h" // main symbols
>2a#|_-T class CHookApp : public CWinApp
ebVfny$D {
9h=WWu', public:
|
lfPd CHookApp();
yYtki // Overrides
41D[[Gh // ClassWizard generated virtual function overrides
TrAUu`?# //{{AFX_VIRTUAL(CHookApp)
]g!<5w public:
4rdrl virtual BOOL InitInstance();
(ajX;/ virtual int ExitInstance();
m_f^#: //}}AFX_VIRTUAL
HWZ*Htr //{{AFX_MSG(CHookApp)
]`m5!V_Y // NOTE - the ClassWizard will add and remove member functions here.
rvO+=Tk // DO NOT EDIT what you see in these blocks of generated code !
_{);n$ ` //}}AFX_MSG
O$^YUHD DECLARE_MESSAGE_MAP()
xGPv3TLH^ };
T^>cT"ux_ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
,%<77LE BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
QKQy)g BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
%LmB`DqZ BOOL InitHotkey();
GMI>$$< BOOL UnInit();
z05pVe/5 #endif
?2c:|FD c+VUk*c3 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
_JoA=<O! #include "stdafx.h"
J],BO\ECH #include "hook.h"
^ 2tCDm5 #include <windowsx.h>
tO$M[P=b #ifdef _DEBUG
T;7|d5][ #define new DEBUG_NEW
GM~jR-FZ #undef THIS_FILE
i^Q^F static char THIS_FILE[] = __FILE__;
5#tvc4+) #endif
s3S73fNOk #define MAX_KEY 100
WX9BS$}0 #define CTRLBIT 0x04
\!Pm^FD
. #define ALTBIT 0x02
YTsn;3d]} #define SHIFTBIT 0x01
7="V7 #pragma data_seg("shareddata")
Zs)9OJu HHOOK hHook =NULL;
?:c hAN@ UINT nHookCount =0;
$TiAJ}: static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
aQuENsB static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
N0NMRU]zT static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
ygG9ht static int KeyCount =0;
F u)7J4Z static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
&kGSxYDk% #pragma data_seg()
Gl(,%~F9i HINSTANCE hins;
3dfSu' void VerifyWindow();
;+\;^nS3d BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
l!2.)F` x //{{AFX_MSG_MAP(CHookApp)
"wc $'7M // NOTE - the ClassWizard will add and remove mapping macros here.
H.e@w3+h // DO NOT EDIT what you see in these blocks of generated code!
&x}JC/u]fd //}}AFX_MSG_MAP
LBzpaLd END_MESSAGE_MAP()
@g{
"
E6 qW9|&GuZ$ CHookApp::CHookApp()
hsh
W5j {
JT<J[Qz5 // TODO: add construction code here,
YN^8s // Place all significant initialization in InitInstance
! JN@4 }
G(L*8U<UG #&^+hx| CHookApp theApp;
xxYFWvi LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
?hO*~w;UU| {
6FfDif BOOL bProcessed=FALSE;
se-}d.PwL if(HC_ACTION==nCode)
H!N,PI?rn {
DN+iS if((lParam&0xc0000000)==0xc0000000){// Key up
9%8T09I! switch(wParam)
| e+m!G1G {
>2ct1_ case VK_MENU:
iJcl0)| MaskBits&=~ALTBIT;
9Rpj&0Is break;
;:cM^LJ case VK_CONTROL:
NEvt71k MaskBits&=~CTRLBIT;
z&eJ?wb break;
m{X;|-DK[ case VK_SHIFT:
RZ -w,~ MaskBits&=~SHIFTBIT;
_=rXaTp break;
>Kxl+F default: //judge the key and send message
lD(d9GVm{z break;
{\k9%2V*+ }
0\/7[nwS for(int index=0;index<MAX_KEY;index++){
*op7:o_ if(hCallWnd[index]==NULL)
6;VlX,,j continue;
R1U\ / if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
hPl;2r {
<1ai0] SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
79&Mc,69 bProcessed=TRUE;
7+ c?eH }
<ioX|.7ZX }
4;_.|!LN }
PRs[:we~~ else if((lParam&0xc000ffff)==1){ //Key down
!-: a`Vs+ switch(wParam)
"?]5"lNC| {
lcih
[M6z case VK_MENU:
^s%Qt MaskBits|=ALTBIT;
m^`X|xK- break;
thOCzGJ$ case VK_CONTROL:
i;)88 MaskBits|=CTRLBIT;
k(Ow.nkb break;
;e-iiC]PI case VK_SHIFT:
3b|.L
Jz+ MaskBits|=SHIFTBIT;
9~N7hLT break;
$
\jly default: //judge the key and send message
Um%E/0j break;
e{"d6pF= }
ow+NT for(int index=0;index<MAX_KEY;index++)
qlSMg;"Ghw {
-5.>9+W8I if(hCallWnd[index]==NULL)
|GIT{_JE continue;
h$lY,7
if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
jAF
DkqH {
T
`N(=T^* SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
ofS9h*wrJ bProcessed=TRUE;
fE7Kv_N-% }
4iDo.1B" }
=#8J9 }
xU)~)eK if(!bProcessed){
lnTl"9F for(int index=0;index<MAX_KEY;index++){
<OpiD%Ctx if(hCallWnd[index]==NULL)
d+=;sJ continue;
x!S8' if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
I_v]^>Xw SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
0\u_\%[ }
>4bOM@[] }
InRn!~_N }
.nT"f>S&' return CallNextHookEx( hHook, nCode, wParam, lParam );
}Dk_gom_
}
\}Hk`n)Aq @@}A\wA- BOOL InitHotkey()
cpf8f i {
^]OD+ v if(hHook!=NULL){
I9B B<~4o nHookCount++;
vw3%u+Z& return TRUE;
R(ay&f%E }
#~nI^
ggW else
8>
Gp #T hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
IgZX,4i=o if(hHook!=NULL)
AQ@A$ nHookCount++;
M,|o 2' return (hHook!=NULL);
}i?P(
Au }
dDAdZxd BOOL UnInit()
3
nb3rHQ {
B7va#'ne4{ if(nHookCount>1){
.3oFSc`q nHookCount--;
#kk_iS>8 return TRUE;
F^KoEWj[H }
;v#~o* BOOL unhooked = UnhookWindowsHookEx(hHook);
H`m|R if(unhooked==TRUE){
Ws}u4t nHookCount=0;
s|YY i~ hHook=NULL;
Z5_MSPm }
v='7.A return unhooked;
QR<IHE{~8 }
o{m$b2BW XgU]Ktl BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
NcRY
Ch {
sLb[ZQ;j BOOL bAdded=FALSE;
8%I4jL< for(int index=0;index<MAX_KEY;index++){
'N0d==aI if(hCallWnd[index]==0){
4e1Zyi! hCallWnd[index]=hWnd;
'0z@Jevd? HotKey[index]=cKey;
2~~Q NWN HotKeyMask[index]=cMask;
7teg*M{ bAdded=TRUE;
&&TQ0w&T KeyCount++;
yAXw?z!`O break;
EVrOu"" }
`fc2vaSH = }
?ZE1>L7e return bAdded;
`QAotSO+ }
v6TH- g@KS\.m] BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[u=b[( {
jats)!: BOOL bRemoved=FALSE;
#Z(8 vA^@ for(int index=0;index<MAX_KEY;index++){
\} P} H if(hCallWnd[index]==hWnd){
cPkN)+K if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
!~"q$T>@ hCallWnd[index]=NULL;
)#M*@e$k HotKey[index]=0;
D 0\
HotKeyMask[index]=0;
'C!b($Y bRemoved=TRUE;
, z<\ Z!+= KeyCount--;
Dm"GCV break;
Skq%S`1%Q }
g_5:o
3s }
J'.U+XU }
%)?$82=2 return bRemoved;
}`\+_@w }
r8}GiP0| @ $4(!80- void VerifyWindow()
TCv}N0 {
0r.*7aXu
for(int i=0;i<MAX_KEY;i++){
t/#[At5p= if(hCallWnd
!=NULL){ V2V^*9(wu@
if(!IsWindow(hCallWnd)){ +}J2\!Jw
hCallWnd=NULL; zl=RK
HotKey=0; 4-lEo{IIM
HotKeyMask=0; W,}HQ
KeyCount--; ,ZC ^,Vq
} I.euuzBgA
} w`UB_h#Bl
} bWW$_Spr
} BOoLs(p
tz6d}$
BOOL CHookApp::InitInstance() #y~^!fdp9
{ 7eqax33f
AFX_MANAGE_STATE(AfxGetStaticModuleState()); "'~'xaU!=a
hins=AfxGetInstanceHandle(); N;9@-Tb
InitHotkey(); 6dt]$
return CWinApp::InitInstance(); > 't=r
} A_muuOIcI
`u3to{
int CHookApp::ExitInstance() NgaX&m`
{ Bq#?g@V
VerifyWindow(); %J!+f-:=
UnInit(); a<B[~J 4i
return CWinApp::ExitInstance(); hCQzD2
} Z}5;K"T/
Q
*![u5#
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file j{C+`~O
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) &~29 %Ns
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ sZ/~pk
#if _MSC_VER > 1000 !=;^Grv>
#pragma once >%h_ R:
#endif // _MSC_VER > 1000 !?`5r)K
G9TK)Nz
class CCaptureDlg : public CDialog @kK${
{ 0Y,_
DU
// Construction \Azl6`Em
public: ,a9<\bd)
BOOL bTray; {0+gPTp
BOOL bRegistered; s?@{
BOOL RegisterHotkey(); {'4h.PB+r
UCHAR cKey; }#Z Q\[
UCHAR cMask; -o#HO_9
void DeleteIcon(); 7^4F,JuJO
void AddIcon(); ~+d?d6*c
UINT nCount; j(HC^\Hi
void SaveBmp(); 3@kiUbq7Eu
CCaptureDlg(CWnd* pParent = NULL); // standard constructor D642}VD
// Dialog Data JEL=,0J
//{{AFX_DATA(CCaptureDlg) GJ edW
enum { IDD = IDD_CAPTURE_DIALOG }; =W"BfG
CComboBox m_Key; 5M4mFC6
BOOL m_bControl; !2s<
v
BOOL m_bAlt; 8;mn7 XX
BOOL m_bShift; X[\b!<C
CString m_Path; J)vP<.3:
CString m_Number; QijEb
//}}AFX_DATA 8 !]$ljg
// ClassWizard generated virtual function overrides |v#N
//{{AFX_VIRTUAL(CCaptureDlg) Mt (wy%{zK
public: Z;M]^?
virtual BOOL PreTranslateMessage(MSG* pMsg); ^o}!=aMr
protected: /PH+K24v~
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support c+c3C8s*8
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); OiH
tobM
//}}AFX_VIRTUAL PXof-W
// Implementation r e.chQ6
protected: -e_IDE
HICON m_hIcon; %wn|H>
// Generated message map functions [h SE^
m
//{{AFX_MSG(CCaptureDlg) lp3 A B
virtual BOOL OnInitDialog(); r\Nf309~
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); xZZW*d_b
afx_msg void OnPaint(); rK)aR
afx_msg HCURSOR OnQueryDragIcon(); VRurn>y0
virtual void OnCancel(); s1.YH?A;
afx_msg void OnAbout(); R L7OFfMe
afx_msg void OnBrowse(); ]BGWJ A5
afx_msg void OnChange(); S7&w r@
//}}AFX_MSG *ci,;-*C
DECLARE_MESSAGE_MAP() "W$,dWF
}; H)S" `j
#endif W}p>jP}
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////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file U\'.rT[#
#include "stdafx.h" 58)`1p\c'
#include "Capture.h" Njsz=
#include "CaptureDlg.h" HTiqErD2_
#include <windowsx.h> }w .[ZeP
#pragma comment(lib,"hook.lib") ( P|Ph
#ifdef _DEBUG f(~xdR))eh
#define new DEBUG_NEW EEFM1asJf
#undef THIS_FILE -02cI}e
static char THIS_FILE[] = __FILE__; M&o@~z0
#endif 3;(;'5|Z
#define IDM_SHELL WM_USER+1 :#W40rUb
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \o3)\
e]o
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Qz/o-W;
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^*(*tS|M
class CAboutDlg : public CDialog \x?q!(;G2
{ &TYTeJ]
public: .v;$sst5y
CAboutDlg(); 1sx@Nvlb
// Dialog Data Si#I^aF`%
//{{AFX_DATA(CAboutDlg) A_3V1<J`]
enum { IDD = IDD_ABOUTBOX }; nI4Kuz`dF
//}}AFX_DATA <?UbzT7X
// ClassWizard generated virtual function overrides Im7<\ b@
//{{AFX_VIRTUAL(CAboutDlg) |hms'n0
protected: *ub]M3O
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [r,a0s
//}}AFX_VIRTUAL hbm%{*d
// Implementation [iVCorU
protected: 7x`dEi<
//{{AFX_MSG(CAboutDlg) OI0#@_L&
//}}AFX_MSG xG:eS:iT
DECLARE_MESSAGE_MAP() `kb]tf
}; Sq^f}q
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CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) GPBp.$q+B
{ 1OB,UU"S$
//{{AFX_DATA_INIT(CAboutDlg) a+A^njk
//}}AFX_DATA_INIT I3 /^{-n
} +vOlA#t%Z
S+(TRIjk
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 4qMqAT
{ S o>P)d$8+
CDialog::DoDataExchange(pDX); A9Cq(L_H
//{{AFX_DATA_MAP(CAboutDlg) W4n;U-Hb
//}}AFX_DATA_MAP <vxj*M;
} `-a](0QU
O.61-rp
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +M4X
r*
//{{AFX_MSG_MAP(CAboutDlg) B#RBR<MFC
// No message handlers mS?.xu
//}}AFX_MSG_MAP \Tf[% Kt x
END_MESSAGE_MAP() 6*yt^[W
DUBEh@
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) k?r-%oJ7
: CDialog(CCaptureDlg::IDD, pParent) B \?We\y
{ _$s ;QI]x
//{{AFX_DATA_INIT(CCaptureDlg) b[5$$_[
m_bControl = FALSE; [:M:6JJ
m_bAlt = FALSE; zTA+s 2
m_bShift = FALSE; .|>zQ(7YC
m_Path = _T("c:\\"); A4;EtW+F
m_Number = _T("0 picture captured."); #4hxbRN
nCount=0; I+nKaN+8i
bRegistered=FALSE; ,w>WuRN"
bTray=FALSE; j1/.3\
//}}AFX_DATA_INIT poJ7q (
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 E=N44[`.G
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); $ =
uz
} z1wJ-l
*Uq1q
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /u
hA\m(
{ s?qRy
2
CDialog::DoDataExchange(pDX); P-B3<~*i!
//{{AFX_DATA_MAP(CCaptureDlg) w[`2t{^j
DDX_Control(pDX, IDC_KEY, m_Key); zJ-_{GiM*L
DDX_Check(pDX, IDC_CONTROL, m_bControl); ]J<2a`IK!
DDX_Check(pDX, IDC_ALT, m_bAlt); luA k$Es
DDX_Check(pDX, IDC_SHIFT, m_bShift); Kob i!
DDX_Text(pDX, IDC_PATH, m_Path); _<;;CI3w
DDX_Text(pDX, IDC_NUMBER, m_Number); #jY\l&E
//}}AFX_DATA_MAP w5j6RQml
} 1oD1ia#
syuW>Z8s
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) )-2sk@y
//{{AFX_MSG_MAP(CCaptureDlg) <i~O0f]
ON_WM_SYSCOMMAND() Gk"o/]Sf
ON_WM_PAINT() h8R3N?S3#
ON_WM_QUERYDRAGICON() )SkJgzvC
ON_BN_CLICKED(ID_ABOUT, OnAbout) \BIa:}9O
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) x3./
ON_BN_CLICKED(ID_CHANGE, OnChange) rL{3O4O
//}}AFX_MSG_MAP $!~R'N c
END_MESSAGE_MAP() E;$;g#ksf
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BOOL CCaptureDlg::OnInitDialog() /(/Z~J[
{ <Mdyz!
CDialog::OnInitDialog(); jO` b&]0
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); /O,>s
ASSERT(IDM_ABOUTBOX < 0xF000); 1iS]n;xcl/
CMenu* pSysMenu = GetSystemMenu(FALSE); i=m5M]Ef
if (pSysMenu != NULL) CV9o,rL
{ J[Ckz]
CString strAboutMenu; C*+gQeK
strAboutMenu.LoadString(IDS_ABOUTBOX); rV
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if (!strAboutMenu.IsEmpty()) +XaRwcLC.
{ ,F&TSzH[@v
pSysMenu->AppendMenu(MF_SEPARATOR); y.xt7
F1
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); U9?fUS
} |E%i
t?3M
} xiWP^dIF
SetIcon(m_hIcon, TRUE); // Set big icon VR8 kY&
SetIcon(m_hIcon, FALSE); // Set small icon s}
I8:ufT
m_Key.SetCurSel(0); %l4;-x<e
RegisterHotkey(); e8WuAI86
CMenu* pMenu=GetSystemMenu(FALSE); h/)kd3$*'
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); JJIlR{WY_
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND);
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pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5%qq#;[n
return TRUE; // return TRUE unless you set the focus to a control iMT[sb
} `l#|][B)g$
& bKl(,
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) G_vcuCHm
{ ~CtLSyB
if ((nID & 0xFFF0) == IDM_ABOUTBOX) O c[F
{ Nld y76|g
CAboutDlg dlgAbout; KF4D)NM|
dlgAbout.DoModal(); m1 tYDZ"i
} >/]`
f8^
else |)Q#U$ m
{ ;+Dq3NE
CDialog::OnSysCommand(nID, lParam); EJCf[#Sf
} 1Fg*--8[r
} {h}0"5
7R4t%^F
void CCaptureDlg::OnPaint() wV604eO(
{ }&*wJ]j`L
if (IsIconic()) '%H\k5^
{ \&6^c=2=
CPaintDC dc(this); // device context for painting )Ja&Y
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); &'V1p4'
// Center icon in client rectangle >=6 j:
int cxIcon = GetSystemMetrics(SM_CXICON); 5LX%S .CW
int cyIcon = GetSystemMetrics(SM_CYICON); O)aWTI
CRect rect; f@j )t%mh
GetClientRect(&rect); ? PI2X.6
int x = (rect.Width() - cxIcon + 1) / 2; 8|"26UwD/
int y = (rect.Height() - cyIcon + 1) / 2; sTSNu+
// Draw the icon t@;r~Sb
dc.DrawIcon(x, y, m_hIcon); G<$N*3
} ^H(,^cVN
else 7'g{:dzS*3
{ tKX+eA]
CDialog::OnPaint(); W5^<4Ya!
} }eK.\_t=
} 6Mj(B*c
n/6qc3\5i
HCURSOR CCaptureDlg::OnQueryDragIcon() TPF5 ?
{ ~PtIq.BY
return (HCURSOR) m_hIcon; X{u\|e{
} z[sP/{~z
aGml!N5'
void CCaptureDlg::OnCancel() #]kO/Mr
{ +B&,$ceyaJ
if(bTray) q2e=(]rKE{
DeleteIcon(); mUdj2vB$+'
CDialog::OnCancel(); X-<l+WP
} =L]GQ=d
XCd[<\l
void CCaptureDlg::OnAbout() Fl}{"eCF8
{ h0aK}`/a
CAboutDlg dlg; mHF?t.y
dlg.DoModal(); DLH|y%"
} >]<4t06D
f
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void CCaptureDlg::OnBrowse() -d4|EtN
{ k@[{_@>4^
CString str; ?J ,K[.z
BROWSEINFO bi;
B2^*Sr[
char name[MAX_PATH]; 1W'0h$5^"
ZeroMemory(&bi,sizeof(BROWSEINFO)); =mYwO=:D
bi.hwndOwner=GetSafeHwnd(); IKVFbTX:y
bi.pszDisplayName=name; E*"oA1/I
bi.lpszTitle="Select folder"; Q#5~"C
bi.ulFlags=BIF_RETURNONLYFSDIRS; s3[\&zt
LPITEMIDLIST idl=SHBrowseForFolder(&bi); [ 0z-X7=e
if(idl==NULL) Dnp><%
return; Fv-~v&
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ~0Z.,p_
str.ReleaseBuffer(); LUzn7FZk
m_Path=str; uI\6":/u
if(str.GetAt(str.GetLength()-1)!='\\') d]K$0HY
m_Path+="\\"; \YPvpUg
UpdateData(FALSE); %W^Zob
} D@)L?AB1f
4x-K0
void CCaptureDlg::SaveBmp() ]P>c{
{ Ez
/
W$U
CDC dc; z#B(1uI
dc.CreateDC("DISPLAY",NULL,NULL,NULL); )I"I[jDw
CBitmap bm; k_`h (R
int Width=GetSystemMetrics(SM_CXSCREEN); vP%}XEF
int Height=GetSystemMetrics(SM_CYSCREEN); PJPKn0,W
bm.CreateCompatibleBitmap(&dc,Width,Height); CrB4%W:{
CDC tdc; ?&-$Zog
tdc.CreateCompatibleDC(&dc); 7$mB.\|
CBitmap*pOld=tdc.SelectObject(&bm); & zv!cf
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); t=fr`|!
tdc.SelectObject(pOld); jAdZS\?w
BITMAP btm; \ #N))gAQ
bm.GetBitmap(&btm); lS]6SkZ6
DWORD size=btm.bmWidthBytes*btm.bmHeight; $IqubC>O
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); s6k(K>Pl
BITMAPINFOHEADER bih; j&[u$P*K
bih.biBitCount=btm.bmBitsPixel; 1&RB=7.h
bih.biClrImportant=0; +ryB*nT
bih.biClrUsed=0; (>uA(#Z
bih.biCompression=0; B,] AfH
bih.biHeight=btm.bmHeight; kqjj&{vPFJ
bih.biPlanes=1; z.^_;Vql_
bih.biSize=sizeof(BITMAPINFOHEADER); vxS4YR b
bih.biSizeImage=size; ZK h4:D
bih.biWidth=btm.bmWidth; 2(5/#$t
bih.biXPelsPerMeter=0; &W3Hj$>
bih.biYPelsPerMeter=0; vX_;Y#uD
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); V\AY =u
static int filecount=0; ]X> I(p@
CString name; $Gcjm~
name.Format("pict%04d.bmp",filecount++); KA>QW[HX
name=m_Path+name; v'm-A d+4t
BITMAPFILEHEADER bfh; N' CWSf.e
bfh.bfReserved1=bfh.bfReserved2=0; vSR5F9
bfh.bfType=((WORD)('M'<< 8)|'B'); h.wffk,
bfh.bfSize=54+size; sL,|+>7T^M
bfh.bfOffBits=54; ^r,0aNzAs
CFile bf; -s0\ 4
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Zs8]A0$
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 1bjz :^
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); y
t7 >,
bf.WriteHuge(lpData,size); I+(
b!(H
bf.Close(); _9dW+
nCount++; @?RaU4e
} G'`^U}9V\
GlobalFreePtr(lpData); nzZs2
if(nCount==1) jz Siw z
m_Number.Format("%d picture captured.",nCount); ]L2b|a3
else iRx `Nx<@
m_Number.Format("%d pictures captured.",nCount); qMoo#UX
UpdateData(FALSE); i(;.Y
} bk&kZI.D
t|s(V-Wq
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 4 Dy1M}7
{ Vl3-cW@p
if(pMsg -> message == WM_KEYDOWN) ?XeaoD/
{ 6"NtVfui
if(pMsg -> wParam == VK_ESCAPE)
N3zZ>#{
return TRUE; m WHyk "l
if(pMsg -> wParam == VK_RETURN) WX]O1Y
return TRUE; KoA +Vv9
} ;kWWzg
return CDialog::PreTranslateMessage(pMsg); ^cE {Uv
} $j8CF3d.6
2.N)N%@
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /r2S1"(q
{ e"*1l>g
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ KYwUkuw)
SaveBmp(); aXzb]">
return FALSE; uF1&m5^W
} sSc~q+xz
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ J{\(Y#|rHs
CMenu pop; F=a
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); f*ABIm
CMenu*pMenu=pop.GetSubMenu(0); LwTdmR
pMenu->SetDefaultItem(ID_EXITICON); .5AFAGv_c
CPoint pt; 'Z:wEt!
GetCursorPos(&pt); E0l&d
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); `'*4B_.
if(id==ID_EXITICON) 54B`T/>R:E
DeleteIcon(); z}B8&*>
else if(id==ID_EXIT) 3,`M\#z%K
OnCancel(); =v'Aub
return FALSE; P;K LN9/4
} 5UOqS#"0
LRESULT res= CDialog::WindowProc(message, wParam, lParam); >I<}:=
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |@d}O8
AddIcon(); %Ofw"W
return res; p_%,JD
} p~Cz6n
mXS"nd30bD
void CCaptureDlg::AddIcon() WPrBK{B`o
{ D(TG)X?
NOTIFYICONDATA data; J7C?Z
data.cbSize=sizeof(NOTIFYICONDATA); `rK@> -
CString tip; F6{/iF
tip.LoadString(IDS_ICONTIP); k Jw
Pd;%
data.hIcon=GetIcon(0); i(.V`G=
data.hWnd=GetSafeHwnd(); s;E(51V<>
strcpy(data.szTip,tip); <Rs$d0/
data.uCallbackMessage=IDM_SHELL; AWPgrv/
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; _Pa@%/
data.uID=98; :-lq Yd5^
Shell_NotifyIcon(NIM_ADD,&data); Q[aF"5h%
ShowWindow(SW_HIDE); 8~yP?#p
bTray=TRUE; u^B! 6Sj8
} F|y0q:U
U1 *P
void CCaptureDlg::DeleteIcon() Ayv:Pv@
{ =cb!2%?}
NOTIFYICONDATA data; #H<}xC2
data.cbSize=sizeof(NOTIFYICONDATA); [i.c;'Wy/
data.hWnd=GetSafeHwnd(); {Rb;1 eYj
data.uID=98; R,["w98a
Shell_NotifyIcon(NIM_DELETE,&data); ZMr[:,Jp
ShowWindow(SW_SHOW); {T,}]oX
SetForegroundWindow(); =S6bP<q
ShowWindow(SW_SHOWNORMAL); .w _BA)
bTray=FALSE; B2*>7 kc_s
} ;K|K]c
;($xAAR
void CCaptureDlg::OnChange() {dP6fr1z
{ *GY8#Az
RegisterHotkey(); (UhJ Pco"
} [{R>'~
| oM`
BOOL CCaptureDlg::RegisterHotkey() J>G'H)
{ >?)_, KL
UpdateData(); _Gt;=
UCHAR mask=0; k h*WpX
UCHAR key=0; {oF;ZM'r
if(m_bControl) g:xg ~H2
mask|=4; ]bmf}&
if(m_bAlt) &iq'V*+-\
mask|=2; 6I=xjgwvf
if(m_bShift) ~;pP@DA
mask|=1; @jjxgd'%&
key=Key_Table[m_Key.GetCurSel()]; 8''1H<f
if(bRegistered){ Z+EZ</'(a
DeleteHotkey(GetSafeHwnd(),cKey,cMask); uOKD#
bRegistered=FALSE; (fr=[m$`
}
I![/bwObG
cMask=mask; J#4pA{01w
cKey=key; 8 $H\b &u
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); _*[vKS A&
return bRegistered; yw%ES
} K4E2W9h
-:Fr($^
四、小结 zVe,HKF/
EbVC4uY
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。