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:
i4Lc$20?d
[e[<p\] 一、实现方法
Hso|e?Z H0m|1
7 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:
tW
WWx~k Wbr+KX8) #pragma data_seg("shareddata")
(T`E!A0I\? HHOOK hHook =NULL; //钩子句柄
yY?b.ty UINT nHookCount =0; //挂接的程序数目
;X*cCb`h static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
}>)[<;M>% static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Bn@(zHG+5& static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
(e(:P~Ry static int KeyCount =0;
<-D/O$q static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
^8.]d~j #pragma data_seg()
8J$|NYv_b 9mA{K 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。
.X# `k vz.>~HBP 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:
1-lu\"H` nRyU]=-X BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
i&{DOI%w cKey,UCHAR cMask)
k0Ol*L!p {
-f*P
nxg BOOL bAdded=FALSE;
sMu]
/'7 for(int index=0;index<MAX_KEY;index++){
O
T.*pk+<) if(hCallWnd[index]==0){
X}+>!%W!} hCallWnd[index]=hWnd;
QQWadVQo HotKey[index]=cKey;
wF(( HotKeyMask[index]=cMask;
jv&*uYm bAdded=TRUE;
'!/<P"5t KeyCount++;
KQB3m" break;
0c} }Q }
Z&;uh_EC }
vZ.x{"n'~ return bAdded;
[Xb@Wh:yG }
9eH$XYy //删除热键
u ~A6bK* BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
BNL;Biyt7 {
uEX!xx?Q# BOOL bRemoved=FALSE;
g$b<1:8 for(int index=0;index<MAX_KEY;index++){
dC RyOid$ if(hCallWnd[index]==hWnd){
|yx6X{$k if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
8F._9U-EN hCallWnd[index]=NULL;
Y "/]|'p HotKey[index]=0;
~ 4kc/a HotKeyMask[index]=0;
"'D=,* bRemoved=TRUE;
+HBd
%1 KeyCount--;
+E{|63~q break;
s&RVJX>Rt }
V4_=<W }
P9T}S }
17`1SGZ return bRemoved;
e)(wss+d7P }
nDHTV!]< EOCN&_Z; Z<vKQ4G DLL中的钩子函数如下:
ZpnxecJUJ Za1QC;7 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
r-Pkfy( {
H ' BOOL bProcessed=FALSE;
UEguF& if(HC_ACTION==nCode)
ljb7oA3cP4 {
=>_\fNy if((lParam&0xc0000000)==0xc0000000){// 有键松开
m6w].-D8 switch(wParam)
p>4-s, W {
9Gnc9_]I;W case VK_MENU:
#`)(e JF MaskBits&=~ALTBIT;
b:TLV`>/& break;
!qWH`[: case VK_CONTROL:
E"5*Ei)^3 MaskBits&=~CTRLBIT;
MRdduPrM%$ break;
,%M$0poKM case VK_SHIFT:
NfjE` MaskBits&=~SHIFTBIT;
[5SD_dN break;
>Z'NXha default: //judge the key and send message
/ G7vwC break;
|'B7v i) }
d>mo~ for(int index=0;index<MAX_KEY;index++){
NA ~Vg8 if(hCallWnd[index]==NULL)
tP$<UKtU continue;
R}!:'^ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
]GW]dM {
dZ0A3(t SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
,^\2P$rT bProcessed=TRUE;
e]zBf;9J }
C$XU%5qi }
^G}47( }
rR(X9i else if((lParam&0xc000ffff)==1){ //有键按下
=Jyu4j *} switch(wParam)
iMDM1}b {
~kEI4}O case VK_MENU:
}khV'6"'| MaskBits|=ALTBIT;
~v|>xqWV break;
`u&Rsz&^ case VK_CONTROL:
xD~5UER MaskBits|=CTRLBIT;
DK:o]~n break;
J^Wa8Q;9lX case VK_SHIFT:
[J?aD`{#O MaskBits|=SHIFTBIT;
hYG6 pTCb break;
kY-N>E: default: //judge the key and send message
Z/Dx,zIR break;
W*),y: }
L?mrbay for(int index=0;index<MAX_KEY;index++){
JehrDC2N if(hCallWnd[index]==NULL)
%D\[* continue;
3
:<WY&9 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
l*d(;AR {
Nh_Mz;ITuu SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
s;01u_ bProcessed=TRUE;
r{L>
F]Tw }
>I-RGW'A }
*Doa*wQ }
jtW!"TOY if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
S.-TOE for(int index=0;index<MAX_KEY;index++){
Y[}>CYO if(hCallWnd[index]==NULL)
#W4dkCd(pF continue;
H4&lb} if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
w"-Lc4t+ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
/<|%yE&KhJ //lParam的意义可看MSDN中WM_KEYDOWN部分
U`, 6 * MS }
3q\,$*D. }
KBx6NU?;PO }
.6+Z^,3 return CallNextHookEx( hHook, nCode, wParam, lParam );
=5~jx }
"K6&dk jY :VRNs 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:
4.[^\N <lx+/o BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
&8Cu#^3
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
mwHB(7YS, ^/I
7|u] 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:
< $lCkSx<Q YNKHN2E8 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
chM%]|gey {
yerg=,$_i if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
a|t$l=|DD {
'"0'Oua //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
1ySk;;3 SaveBmp();
r!_-"~`7E return FALSE;
`ZYoA
t]C~ }
V5V
bJBpf …… //其它处理及默认处理
6-N?mSQU }
{FeDvhv t5\-v_mG=& Cjm`|~&e+ 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。
IA8f*]? U)fc*s 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。
Rr&h!YMb JjtNP)We 二、编程步骤
yVU^M?`# :}'=`wa 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";
#A1%gIw<v2 9-&Ttbb4)0 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
sJL&:!}V> ^oBtfN>4 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;
tqE6>"jD c}lb%^;)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;
VA6} at#ja_ hd 5、 添加代码,编译运行程序。
?~BC#B\>o Gw/Pk4R 三、程序代码
S 6@u@C 4KhV|#-;k ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
i1ixi\P{0 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
6tgt>\y #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
]sf7{lVT #if _MSC_VER > 1000
:%tU'w #pragma once
#xsE3Wj-X #endif // _MSC_VER > 1000
##,a0s^ #ifndef __AFXWIN_H__
{Z(h.de #error include 'stdafx.h' before including this file for PCH
V\ZG d+? #endif
UOv+T8f= #include "resource.h" // main symbols
k9sh @ENy class CHookApp : public CWinApp
vYwYQG {
%KCyb public:
F~R;n_IJ CHookApp();
>*~L28Fyn // Overrides
:3v}kLO7| // ClassWizard generated virtual function overrides
^S4d:-.3 //{{AFX_VIRTUAL(CHookApp)
b[r8e public:
PCHu#5j_a virtual BOOL InitInstance();
DU0zez I9 virtual int ExitInstance();
M'?,] an //}}AFX_VIRTUAL
ZQ4p(6a //{{AFX_MSG(CHookApp)
kj#?whK6~ // NOTE - the ClassWizard will add and remove member functions here.
k^3>Y%^1 // DO NOT EDIT what you see in these blocks of generated code !
D=q:*x //}}AFX_MSG
l:
HTk4$0 DECLARE_MESSAGE_MAP()
-u6bAQ };
\:%(q/v"X LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
T,,WoPU8t BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Sq>dt[7 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
DrKP%BnS BOOL InitHotkey();
"%`1]Fr BOOL UnInit();
dU&a{$ku[ #endif
<Th6r.#? d~9A+m3b_ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
I&D5;8 #include "stdafx.h"
F+YZE[h% #include "hook.h"
e(]!GA #include <windowsx.h>
ePOG}k($/% #ifdef _DEBUG
1!xQ=DU" #define new DEBUG_NEW
,Xu-@br{ #undef THIS_FILE
ne>pOK<vZ static char THIS_FILE[] = __FILE__;
Nyku4r0 #endif
l5S aT,% #define MAX_KEY 100
)Kc<j!8-[ #define CTRLBIT 0x04
$SlIr<'*" #define ALTBIT 0x02
[+rfAW>p} #define SHIFTBIT 0x01
>6ni")Q9 #pragma data_seg("shareddata")
D$w6V HHOOK hHook =NULL;
tqz3zIQ UINT nHookCount =0;
3+)J
@(a static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
3]5^r} static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
#3i3G(mQ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
[;n9:Qxf static int KeyCount =0;
+F R0(T static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
H*d9l2,KZS #pragma data_seg()
Mo|;'+ HINSTANCE hins;
k0OYJ/ void VerifyWindow();
Y+kfBvxyf BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
-$pzl,^ h //{{AFX_MSG_MAP(CHookApp)
aB_F9;IR // NOTE - the ClassWizard will add and remove mapping macros here.
EuZ<quwWg // DO NOT EDIT what you see in these blocks of generated code!
@:oXN]+
_ //}}AFX_MSG_MAP
Ot4 Z{mA END_MESSAGE_MAP()
Xpr?Kgz ]0Y4U7W CHookApp::CHookApp()
,82S=N5V! {
Y>dF5&(kb // TODO: add construction code here,
5dx$HE&b) // Place all significant initialization in InitInstance
-RE^tW*Yy }
I,E?h?6Y &fDIQISC CHookApp theApp;
+5w))9@ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
2~Kgv|09 {
R[zpD%CI BOOL bProcessed=FALSE;
.M qP_Z', if(HC_ACTION==nCode)
@CpfP;*{w` {
d6Ht2 if((lParam&0xc0000000)==0xc0000000){// Key up
"|x^|n8i switch(wParam)
%"q9:{m {
S ^!n45l case VK_MENU:
ahJ`T*)HY MaskBits&=~ALTBIT;
J9\Cm!H break;
2]z8:a case VK_CONTROL:
prWk2_D;* MaskBits&=~CTRLBIT;
K?6jXJseb break;
qrb[-|ie& case VK_SHIFT:
!]"@kl% MaskBits&=~SHIFTBIT;
)MtF23k)g break;
w^\52 default: //judge the key and send message
T`9lV2x*P break;
.N,bIQnj }
57'*w]4f for(int index=0;index<MAX_KEY;index++){
BGvre'67 if(hCallWnd[index]==NULL)
G4Q[Th continue;
&agWaf1%a if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Uf1!qP/H? {
[zH:1Zhl& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
ncZ+gzK|" bProcessed=TRUE;
4zXFuTr($ }
aHV;N#Lx3 }
3(="YbZ }
qz"}g/;? else if((lParam&0xc000ffff)==1){ //Key down
xipU8'ac/ switch(wParam)
0CWvYC%e {
6gL#C& case VK_MENU:
e2AX0( MaskBits|=ALTBIT;
5Y.)("1f}f break;
4R#chQ case VK_CONTROL:
5GI,o|[s6 MaskBits|=CTRLBIT;
pI1-cV,` break;
;dkYf24 case VK_SHIFT:
=-0/k;^ MaskBits|=SHIFTBIT;
)%`c_FL@N= break;
WltQ63u default: //judge the key and send message
xzdf^Ce break;
GF"hx`zyJ }
{dhXIs for(int index=0;index<MAX_KEY;index++)
_:ReN_0 {
z{8bvuE if(hCallWnd[index]==NULL)
KWq+PeB5TS continue;
dph{74Dc if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
'3R`lv {
$By<$ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
8^kGS-+^ bProcessed=TRUE;
KKb,d0T[ }
IY_iB*T3jt }
.ODU }
y;4OY if(!bProcessed){
4(#'_jS for(int index=0;index<MAX_KEY;index++){
(j%~u&+- if(hCallWnd[index]==NULL)
MS
nG3]{z continue;
ntu5{L'8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
v3*_9e SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
D.r<QO~6B }
`vU%*g&R }
V )3KS- }
^\hG"5# return CallNextHookEx( hHook, nCode, wParam, lParam );
272q1~& }
F6LH $C
YC*"Thuu BOOL InitHotkey()
lz/8 {
=h-U
if(hHook!=NULL){
aEBu *`-j nHookCount++;
DMAIM|h return TRUE;
T"(&b~m2b4 }
_no/F2>!/n else
GiJ *Wp hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Ozw.siD if(hHook!=NULL)
I!ED?n nHookCount++;
<!&[4-;fU return (hHook!=NULL);
HNb/-e ," }
S%$ }( BOOL UnInit()
^8]NxV@l {
)~&CvJ if(nHookCount>1){
el&0}`K nHookCount--;
#{6{TFx\ return TRUE;
l?\jB\, }
pg6cF BOOL unhooked = UnhookWindowsHookEx(hHook);
S~<$Hy*kh if(unhooked==TRUE){
9G9t" { nHookCount=0;
?Lx24*5% hHook=NULL;
.zr-:L5{ }
d}OTO10 return unhooked;
,xw#NG6 }
dydc}n .fn\]rUv BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
FK^p")i {
T5|qRlW BOOL bAdded=FALSE;
`b?R#:G for(int index=0;index<MAX_KEY;index++){
Av$]|b if(hCallWnd[index]==0){
Vk`h2BV hCallWnd[index]=hWnd;
mJ<=n?{Z HotKey[index]=cKey;
ajve~8/& HotKeyMask[index]=cMask;
:)8VdWg bAdded=TRUE;
_aq8@E~ KeyCount++;
t;){D:]k break;
j SHk{T!J }
.L+6 $8m }
/hpY f]t return bAdded;
x" 7H5< }
|a8iZ9/D6 B=U 3
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
y3vdUauOn {
ov|d^)' BOOL bRemoved=FALSE;
{5A2& for(int index=0;index<MAX_KEY;index++){
J.3u^~zy if(hCallWnd[index]==hWnd){
<3L5"77G6 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
bs+f,j-oBN hCallWnd[index]=NULL;
uY0lR:| HotKey[index]=0;
q~rEq%tk HotKeyMask[index]=0;
]yV! bRemoved=TRUE;
H
h4WMZJG KeyCount--;
at @G/? break;
6S},(= }
sZ'nYo }
H!c@klD }
u+dLaVlLJ return bRemoved;
} FE>|1 }
k3~}7]O) N[?N5~jG void VerifyWindow()
OwuE~K7b{ {
aasoW\UG for(int i=0;i<MAX_KEY;i++){
FOb0uj=(v if(hCallWnd
!=NULL){ c7 ?_46J
if(!IsWindow(hCallWnd)){ -Mip,EO
hCallWnd=NULL; P=qa::A
HotKey=0; #OZ>V3k
HotKeyMask=0; CZ8KEBl
KeyCount--; rDl*d`He!
} ]{!U@b
} eFipIn)b
} bT</3>+C
} /Jta^Bj
.n TwPrG
BOOL CHookApp::InitInstance() \-L&5x"x
{ u^&A W$
AFX_MANAGE_STATE(AfxGetStaticModuleState()); vjLJinJ/
hins=AfxGetInstanceHandle(); }pDqe;a{
InitHotkey(); XWDL5K
return CWinApp::InitInstance(); Ltv]pH}YN
} =pr`'
"7U4'Y:E
int CHookApp::ExitInstance() 1f%1*L0>@
{ T
_r:4JS
VerifyWindow(); oVnvO iAc
UnInit(); 60P<4
return CWinApp::ExitInstance(); "33Fv9C#bK
} 0Vj4+2?L5;
bw(a6qKK
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 'QJ:`)z
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 90Pl$#cb2
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ dMPc:tJT
#if _MSC_VER > 1000 c>,KZ!
#pragma once {SOr#{1z*
#endif // _MSC_VER > 1000 X1,I
GC<l#3+
class CCaptureDlg : public CDialog `-.%^eIp
{ SII;n2[Ze
// Construction r`=+ L-!
public: LuNc,n%
BOOL bTray; ks&*O!h
BOOL bRegistered; Ki4r<>\l{H
BOOL RegisterHotkey(); F7A=GF'
UCHAR cKey; q6@Lp^f
UCHAR cMask; ?:pP8/y
void DeleteIcon(); ~Uj=^leYO
void AddIcon(); |<HPn4
,X
UINT nCount; wYdb*"R
void SaveBmp(); QFE:tBHe
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 6O|@xvg
// Dialog Data oOnop-z7
//{{AFX_DATA(CCaptureDlg) .RE:;<|w
enum { IDD = IDD_CAPTURE_DIALOG }; 2^Eg9y'
CComboBox m_Key; #[,IsEpDO1
BOOL m_bControl; iyA'#bE-
BOOL m_bAlt; VQ"hUX8
BOOL m_bShift; 8H;t_B
CString m_Path; ?TM,Q
CString m_Number; %!]@J[*1
//}}AFX_DATA wHzEMwY_
// ClassWizard generated virtual function overrides !-ok"k0,u
//{{AFX_VIRTUAL(CCaptureDlg) Mh~q//
public: Vl5`U'^qx
virtual BOOL PreTranslateMessage(MSG* pMsg); ) dn(G@5
protected: T m,b,hi$
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2-&k^Gl!:
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); nx@=>E+a
//}}AFX_VIRTUAL g~ZvA(`
// Implementation =w;F<M|Y
protected: :Uz| 3gq
HICON m_hIcon; \O}E7-
// Generated message map functions g=39C>
//{{AFX_MSG(CCaptureDlg) X]'{(?Ch
virtual BOOL OnInitDialog(); 2I%MAb&1@
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %;cddLQ\xY
afx_msg void OnPaint(); %.vQU @2A
afx_msg HCURSOR OnQueryDragIcon(); VAWF3
virtual void OnCancel(); dOa+(fMe
afx_msg void OnAbout(); RtGWG*v4]
afx_msg void OnBrowse(); u0 P|0\
afx_msg void OnChange(); bmJ5MF]_fG
//}}AFX_MSG uYn_? G
DECLARE_MESSAGE_MAP() zxJ]"N
}; wi;Br[d
#endif 6{x(.=
wE[]6\_x1
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ]"J~:{, d
#include "stdafx.h" rk&IlAE
#include "Capture.h" }e!x5g
#include "CaptureDlg.h" N+++4;
#include <windowsx.h> ! _f9NK
#pragma comment(lib,"hook.lib") YT8vP~
#ifdef _DEBUG 48c1gUwoP
#define new DEBUG_NEW .|hf\1_J
#undef THIS_FILE fo5iJz"Z
static char THIS_FILE[] = __FILE__; hq%?=2'9?
#endif o%v0h~tn
#define IDM_SHELL WM_USER+1 uH/J]zKR
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); V:qSy#e
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,3?Q(=j
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; S\4tzz @
class CAboutDlg : public CDialog B&\IGWG(
{ Z LB4m`
public: OPwtV9%
CAboutDlg(); .}^g!jm~h
// Dialog Data 'w!Cn>
//{{AFX_DATA(CAboutDlg) 8?J&`e/
enum { IDD = IDD_ABOUTBOX }; ZU85P0
//}}AFX_DATA 7"aN#;&
// ClassWizard generated virtual function overrides 4\y/'`xm)6
//{{AFX_VIRTUAL(CAboutDlg) 2w59^"<,
protected: E7NV ^4h
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }0eF~>Df
//}}AFX_VIRTUAL y6LWx:
// Implementation lH-/L(h2
protected: Z9:-rcr
//{{AFX_MSG(CAboutDlg) M|6A0m#Q
//}}AFX_MSG [.m`+
DECLARE_MESSAGE_MAP() Yb+yw_5
}; \wo?47+=
>[MX:Yh
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 0>C T=(A
{ n.T&}ZPz\v
//{{AFX_DATA_INIT(CAboutDlg) ,#Iu
7di
//}}AFX_DATA_INIT EwuO&q
} >XK
PTC5H
@*OZx 9
void CAboutDlg::DoDataExchange(CDataExchange* pDX) @<&5J7fb
{ j2ve^F:Q
CDialog::DoDataExchange(pDX); ~T9/#-e>BF
//{{AFX_DATA_MAP(CAboutDlg) Ge2q%
//}}AFX_DATA_MAP s1=X>'q
} aIJt0;
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BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) %JXE5l+pJ
//{{AFX_MSG_MAP(CAboutDlg) (}a8"]Z
// No message handlers TFH \K{DM
//}}AFX_MSG_MAP L0*nm.1X
END_MESSAGE_MAP() u\ #"L
a&tSj35*6
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]4~lYuI4
: CDialog(CCaptureDlg::IDD, pParent) 5Y.vJz
{ V@Rrn <l
//{{AFX_DATA_INIT(CCaptureDlg) E^QlJ8
m_bControl = FALSE; #OIcLEn%
m_bAlt = FALSE; aEM %R<e
m_bShift = FALSE; s}j{#xT
m_Path = _T("c:\\"); A9f)tqbc
m_Number = _T("0 picture captured."); 21
O'M
nCount=0; .P;*D ws
bRegistered=FALSE; KB%"bqB|
bTray=FALSE; r
YogW!
//}}AFX_DATA_INIT %`OJ.:k
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 o}W%I/s
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
`dFq:8v
} E5)b
P\w\N2
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) eCN })An
{ =+ytTQc*ot
CDialog::DoDataExchange(pDX); f47Od-\-
//{{AFX_DATA_MAP(CCaptureDlg) N"8_S0=pw
DDX_Control(pDX, IDC_KEY, m_Key); #.it]Nv{
DDX_Check(pDX, IDC_CONTROL, m_bControl); ABF"~=aL
DDX_Check(pDX, IDC_ALT, m_bAlt); ,$+lFv3LE
DDX_Check(pDX, IDC_SHIFT, m_bShift); c\iA89msp
DDX_Text(pDX, IDC_PATH, m_Path); =; ^%(%Y{m
DDX_Text(pDX, IDC_NUMBER, m_Number); l;JA8o\x
//}}AFX_DATA_MAP (^@ra$.
} fG}tMSI
Y,WuBH
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) #cnq(S=.
//{{AFX_MSG_MAP(CCaptureDlg) L[^9E'L$
ON_WM_SYSCOMMAND() N
F2/B#q
ON_WM_PAINT() S'A>2>
ON_WM_QUERYDRAGICON() (5R?#vj
ON_BN_CLICKED(ID_ABOUT, OnAbout) +s,Qmmb7)
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) /4c\K-Z;
ON_BN_CLICKED(ID_CHANGE, OnChange)
Jd%H2`
//}}AFX_MSG_MAP Fz1_w$^
END_MESSAGE_MAP() 5|l* `J)
94+KdHAo^M
BOOL CCaptureDlg::OnInitDialog() wT `a3Ymm
{ MZlk0o2
CDialog::OnInitDialog(); 9/hrjItV
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); OlAs'TE^
ASSERT(IDM_ABOUTBOX < 0xF000); Q?3Gk%T0[
CMenu* pSysMenu = GetSystemMenu(FALSE); Yj)#k)x
if (pSysMenu != NULL) eln&]d;
{ q8s0AN'@t'
CString strAboutMenu; OJ/,pLYu
strAboutMenu.LoadString(IDS_ABOUTBOX); IqC]! H0
if (!strAboutMenu.IsEmpty()) }D7I3]2>
{ b+@JY2dvj
pSysMenu->AppendMenu(MF_SEPARATOR); 0|$v-`P$
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); odPL{XFj
} %K\?E98M
} R(2tlZ
SetIcon(m_hIcon, TRUE); // Set big icon Cz72?[6
SetIcon(m_hIcon, FALSE); // Set small icon +)j$|x~(A
m_Key.SetCurSel(0); q0$
!y!~
RegisterHotkey(); (>VX-Y/
CMenu* pMenu=GetSystemMenu(FALSE); u#Z#)3P
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 0Uz\H0T1
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )+}]+xRWGj
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ROk5]b.
return TRUE; // return TRUE unless you set the focus to a control ?\$#L^;b}
} rypTKT|U;
{jYOsl
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) s0DGC
{ jJuW-(/4[
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Q.]}]QE
{ c8L~S/t
CAboutDlg dlgAbout; %7"X(Ts7B
dlgAbout.DoModal(); cJ1#ge%4
} 31rx-D8o
else 3H|_mX
{ bKrhIU[
CDialog::OnSysCommand(nID, lParam); 3jlh}t>$l
} /[Z,MG
} #;%JT
F'B8v3
void CCaptureDlg::OnPaint() EGZb7:Y?
{ O9EKRt
if (IsIconic()) I9:Cb)hbU]
{ l~6?kFy9h
CPaintDC dc(this); // device context for painting o'W5|Gy
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); QAvir%Y9Q
// Center icon in client rectangle blTo5NLX
int cxIcon = GetSystemMetrics(SM_CXICON); 1E73i_L
int cyIcon = GetSystemMetrics(SM_CYICON); 9[m6Li
CRect rect; mf}O-Igte
GetClientRect(&rect); t?9v^vFR
int x = (rect.Width() - cxIcon + 1) / 2; Q\cjPc0y
int y = (rect.Height() - cyIcon + 1) / 2; ~.UrL(l=
// Draw the icon 0%m)@ukb
dc.DrawIcon(x, y, m_hIcon); $% 1vW=d
} D9FJ 1~
else vgUb{D
{ Aj2OkD
CDialog::OnPaint(); ~ECD`N<YF
} QNARkYY~|
} ~$p2#AqX
o(S{VGi,
HCURSOR CCaptureDlg::OnQueryDragIcon() hO';{Nl/$
{ ?Rj ~f{%g
return (HCURSOR) m_hIcon; hir4ZO%Zt
} \T<$9aNb
2I&o69x?
void CCaptureDlg::OnCancel() >y[oP!-|P
{ 9'{}!-(xR
if(bTray) .h9l7
nZt
DeleteIcon(); " )V130<
CDialog::OnCancel(); czm&~n6$
} 'B@e8S)y
7.Z@Wr?
void CCaptureDlg::OnAbout() B<~ NS)w
{ \'9PZ6q{
CAboutDlg dlg; cG?cUw).E
dlg.DoModal(); Eh|]i;G%
} G.(mp<-
|37
g ~
void CCaptureDlg::OnBrowse() {%IE xPJ
{ ,:??P1
CString str; /)dFK~
BROWSEINFO bi; >2]JXLq
char name[MAX_PATH]; 'A:x/iv}^
ZeroMemory(&bi,sizeof(BROWSEINFO)); %K>.lh@
bi.hwndOwner=GetSafeHwnd(); [o.B
bi.pszDisplayName=name;
F0:A]`|
bi.lpszTitle="Select folder"; 'k4E4OB
bi.ulFlags=BIF_RETURNONLYFSDIRS; cOPB2\,
LPITEMIDLIST idl=SHBrowseForFolder(&bi); xj[(P$,P
if(idl==NULL) xia |+
return; ap{2$k ,
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); O9g{+e`
str.ReleaseBuffer(); :%sXO
m_Path=str; FIbp"~
if(str.GetAt(str.GetLength()-1)!='\\') Ay
!G1;
m_Path+="\\"; *Mw_0Y
UpdateData(FALSE); 9:e YU
=
} ~t^eiyv
LrATSq@
void CCaptureDlg::SaveBmp() (4\d]*u5-c
{ QK+(g,)_86
CDC dc; ed:@C?
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Z7RiPSdxp
CBitmap bm; m+#iR}*1L
int Width=GetSystemMetrics(SM_CXSCREEN); 1P(|[W1
int Height=GetSystemMetrics(SM_CYSCREEN); ,}:G\u*Fu
bm.CreateCompatibleBitmap(&dc,Width,Height); r\blyWi
CDC tdc; k%E2n:|*
tdc.CreateCompatibleDC(&dc); 04*6(L)h*
CBitmap*pOld=tdc.SelectObject(&bm); 2^)1N>"g
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); b*FC\:\
tdc.SelectObject(pOld); ^;Sy. W&`
BITMAP btm; z^GDJddG
bm.GetBitmap(&btm); vmLxkjUm#
DWORD size=btm.bmWidthBytes*btm.bmHeight; H6&J;yT}
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 5ux`U{`m
BITMAPINFOHEADER bih; z8[yt282
bih.biBitCount=btm.bmBitsPixel; 2KQoy;
bih.biClrImportant=0; cZ<A0
bih.biClrUsed=0; 6<' 21
bih.biCompression=0; 8P"_#M?!
bih.biHeight=btm.bmHeight; =L C:SFzF
bih.biPlanes=1; M4d47<'*~
bih.biSize=sizeof(BITMAPINFOHEADER); {U84 _Pi
bih.biSizeImage=size; U-:ieao@
bih.biWidth=btm.bmWidth; )x]3Zq
bih.biXPelsPerMeter=0; 4T?h
bih.biYPelsPerMeter=0; sYdRh?Hq
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); |=EZ1<KzD
static int filecount=0; {O+Kw<d
CString name; JMVNmq&0
name.Format("pict%04d.bmp",filecount++); NHl|x4Zpw
name=m_Path+name; =b[_@zq]
BITMAPFILEHEADER bfh; TARXx>
bfh.bfReserved1=bfh.bfReserved2=0; (%U@3._
bfh.bfType=((WORD)('M'<< 8)|'B'); E"L2&.
bfh.bfSize=54+size; 1Jj Y!
bfh.bfOffBits=54; 06Gt&_Q
CFile bf; JKX_q&bUw
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ w=}uwvn NX
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Nr0
(E
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); nwN@DqO
bf.WriteHuge(lpData,size); d oB
bf.Close(); 4&HXkRs:
nCount++; b9"jtRTdz
} >/#KI~}'N
GlobalFreePtr(lpData); _ib"b#
if(nCount==1) _$p$")
m_Number.Format("%d picture captured.",nCount); 3 ( ]M{4j
else 7c;9$j
m_Number.Format("%d pictures captured.",nCount); OKHX)"j\\
UpdateData(FALSE); ^::EikpF%
} Vf`7V$sr
4pln5v=
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) wP57Pf0
{ [j"9rO" +
if(pMsg -> message == WM_KEYDOWN) *#TYqCc+g
{ jM&r{^(
if(pMsg -> wParam == VK_ESCAPE) E( h<$w8s
return TRUE; TI !a )X
if(pMsg -> wParam == VK_RETURN)
|TE}`?y[g
return TRUE; gh>>Ibf
} 8`b`QtGf
return CDialog::PreTranslateMessage(pMsg); IQ!\w-
} gaf$uT2
@A+RVg*=
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \V>?Do7
{ +`sv91c
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ gt\MS;jMa
SaveBmp(); :d8W+|1u
return FALSE; a,o_`s<
} {,cCEXag%
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ k/03ZxC-
CMenu pop; jt@SZI`
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); <F
)_!0C
CMenu*pMenu=pop.GetSubMenu(0); 0A:n0[V:]
pMenu->SetDefaultItem(ID_EXITICON); fGv#s
X
CPoint pt; q\rC5gk>
GetCursorPos(&pt); #XnPsU<J
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); $o +5/c?|
if(id==ID_EXITICON) !;Jmg
DeleteIcon(); jY6MjZI
else if(id==ID_EXIT) n9;;x%6 .I
OnCancel(); 9=,uq;
return FALSE; huudBc
A[
} 5`]UE7gT
LRESULT res= CDialog::WindowProc(message, wParam, lParam); nr)c!8
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 63!rUB!
AddIcon(); ?+c`]gO7N
return res; ZvGgmLN
} +f0~D(d!_
+x]9+D&
void CCaptureDlg::AddIcon() azP+GM=i7
{ >23-
NOTIFYICONDATA data; efG6v
data.cbSize=sizeof(NOTIFYICONDATA); ^>?CMcN4*
CString tip; AkU<g
tip.LoadString(IDS_ICONTIP); ?%O3Oi Xz
data.hIcon=GetIcon(0); j$da8] !
data.hWnd=GetSafeHwnd(); QR">.k4QJ
strcpy(data.szTip,tip); L'i-fM[#
data.uCallbackMessage=IDM_SHELL; pr,p=4m{\
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; $^ 'aCU0C
data.uID=98; lZ&]|*>
Shell_NotifyIcon(NIM_ADD,&data); AOp/d(vx5i
ShowWindow(SW_HIDE); `O^G5 0
bTray=TRUE; =op%8NJf
} qi^!GA'5j
d/74{.
void CCaptureDlg::DeleteIcon() 0lM{l?
{ `Y40w#?uW
NOTIFYICONDATA data; 0)m8)!gj
data.cbSize=sizeof(NOTIFYICONDATA); K1?Gmue#I
data.hWnd=GetSafeHwnd(); -S%x
wJKM
data.uID=98; +fKtG]$
Shell_NotifyIcon(NIM_DELETE,&data); '<iK*[NW
ShowWindow(SW_SHOW); qEUT90
SetForegroundWindow(); ._z'g_c(
ShowWindow(SW_SHOWNORMAL); QMo}W{D
bTray=FALSE; qW_u
} Q>qFM9Z
CJaKnz
void CCaptureDlg::OnChange() 3ew8m}A{O
{ fU2qrcVu
RegisterHotkey(); +]:2\TTGI
} *FR$vLGn
-V %gVI[
BOOL CCaptureDlg::RegisterHotkey() 0(8H;T
{ w>xV
UpdateData(); ]+DI.%
UCHAR mask=0; .w6eJ4]
UCHAR key=0; O)R(==P26P
if(m_bControl) rC[6lIP
mask|=4; "k$JP
if(m_bAlt) d h^^G^
mask|=2; $!A:5jech
if(m_bShift) f]8I64
mask|=1; ]J2:194
key=Key_Table[m_Key.GetCurSel()]; rAdacnZV
if(bRegistered){ Gi^Ha=?J%
DeleteHotkey(GetSafeHwnd(),cKey,cMask); *oI*-C
bRegistered=FALSE; bVr*h2p
} mT*{-n_Zs
cMask=mask; 4\
/*jA
cKey=key; c:M$m3Cs?
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 02JL*
return bRegistered; vOI[Z0Lq9h
} -m 5}#P89
*B)yy[8j+
四、小结 io4A>>W==/
tZWrz
e^
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。