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:
%Z8vdU# l
i\H+X 一、实现方法
==cd>03() %o}(sShS 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:
\NqEw@91B `E\imL #pragma data_seg("shareddata")
cW``M.d'F HHOOK hHook =NULL; //钩子句柄
w#^U45y1v UINT nHookCount =0; //挂接的程序数目
.!}hhiF,Z static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
/i)Hb`(S static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
IOK}+C0e static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
p$k\m|t static int KeyCount =0;
G]Jz"xH# static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
>x[`;O4 #pragma data_seg()
w G8Wez% M3zDtN 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
|8)Xc=Hz I|/'Ds: DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
@+_&Y] y)F!c29 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
= c~I
. cKey,UCHAR cMask)
gNx+>h`AF {
uvA(Rn BOOL bAdded=FALSE;
PzY)"]g for(int index=0;index<MAX_KEY;index++){
T!Sj<,r+j if(hCallWnd[index]==0){
Bfd-:`Jk hCallWnd[index]=hWnd;
#ycL'T`X% HotKey[index]=cKey;
QT#6'>&7-b HotKeyMask[index]=cMask;
G*\h\@ bAdded=TRUE;
,kgF2K! KeyCount++;
M@p"yq break;
!~lW3 }
l>v{ }
JLb6C52 return bAdded;
Q;nAPS }
mo1
puU //删除热键
N*DhjEU)[ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
:[M[( {
%McO6.M@ BOOL bRemoved=FALSE;
e@F|NCQ.9 for(int index=0;index<MAX_KEY;index++){
r-w2\ 2 if(hCallWnd[index]==hWnd){
2:$ k if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
uG>nV hCallWnd[index]=NULL;
S)%_we LW7 HotKey[index]=0;
ad!(z[F'Y HotKeyMask[index]=0;
,M3z!=oIGn bRemoved=TRUE;
#X.+ KeyCount--;
~DLIz g7p! break;
'Zk<l#"} }
eSl-9
^ }
3z{S}~ }
F?Or;p5`Y return bRemoved;
(OQ?<'Qa }
sXl ??UGe 'nK~'PZ, PdY>#Cyh DLL中的钩子函数如下:
^ua12f +zWrLf_Rc LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
X9~m8c){z {
\Kd7dK9&] BOOL bProcessed=FALSE;
~"ONAX if(HC_ACTION==nCode)
bdV3v` {
t ,qul4y} if((lParam&0xc0000000)==0xc0000000){// 有键松开
nR8]@c C switch(wParam)
LD+f'^>>Z {
gZ(O)uzv case VK_MENU:
W81o"TR|pt MaskBits&=~ALTBIT;
.R5/8VuHF break;
NcL
=zo< case VK_CONTROL:
015Owi MaskBits&=~CTRLBIT;
jeDlH6X' break;
=sQ(iso%f case VK_SHIFT:
$<e +r$1 MaskBits&=~SHIFTBIT;
J(d2:V{h break;
ccO
aCr default: //judge the key and send message
\_oy$>; break;
Xa`(;CLW? }
W._G0b4} for(int index=0;index<MAX_KEY;index++){
=cfm=+ if(hCallWnd[index]==NULL)
0->/`/xm continue;
D6!t VdnVe if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
_1JmjIH)M {
PI7IBI SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
6tOi^+qN bProcessed=TRUE;
5_G'68;OV }
J0Four#MD }
j%M @# }
-
8syjKTg else if((lParam&0xc000ffff)==1){ //有键按下
<q7s`,rG switch(wParam)
\7E`QY4 {
0~xaUM` case VK_MENU:
4/L>&%8V MaskBits|=ALTBIT;
umDtp\ break;
*1;23BiH- case VK_CONTROL:
#J+\DhDEPO MaskBits|=CTRLBIT;
uFe'$vI break;
|t\KsW case VK_SHIFT:
ci7~KewJ* MaskBits|=SHIFTBIT;
U5rxt^ break;
0]a1 5 default: //judge the key and send message
u~71l)LA break;
*4#on> }
[&n|\! for(int index=0;index<MAX_KEY;index++){
;4d.)-<No_ if(hCallWnd[index]==NULL)
1hNEkpL^a continue;
?1m ,SK if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
/v&`!nKu {
Cnur"?w@o SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
3#9M2O\T bProcessed=TRUE;
, ;'SVe% }
ct\<;I(H }
0=m&^Jpp }
psD[j W if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
szn%wZW for(int index=0;index<MAX_KEY;index++){
yGV{^?yoP if(hCallWnd[index]==NULL)
X'2Gi continue;
JfKg_&hM if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
jI#z/a!j: SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
bD@@tGr;W //lParam的意义可看MSDN中WM_KEYDOWN部分
Orc>.~+f%A }
{@\/a }
A}eOR=E }
ocP*\NR return CallNextHookEx( hHook, nCode, wParam, lParam );
~}%&p&
p }
L` [F~$| *'^:S#= 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:
0HPO"x3-O l-=e62I{=| BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
0(vdkC4\A BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
7h1"^}M& M;@Ex`+?i 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:
|
W?[,|e oF&IC
j0 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Z`"n:'& {
Rc%PZ}es if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
fSC.+,qk {
`g8tq //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
3It8&x: SaveBmp();
%f#\i#G<k return FALSE;
Jh(mbD }
QZYM9a> …… //其它处理及默认处理
sBB:$X }
A xR\ned &u4Ve8# z{V8@q/ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
DzmqR0) 9>zDJx 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
V"U~Q=`K `NoCH[$!+ 二、编程步骤
j>g9\i0O1 DUPmq!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";
`~KAk wJr/FE7c 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
~{Ua92zV9 (77Dif0)' 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;
X?_v+'G *U2Ck<"] 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;
2q$X>ImI$ % $\}z(G 5、 添加代码,编译运行程序。
vy:6_ ILIRI[7( 三、程序代码
} _VZ *ig5Q(b*N ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
2"_ 18l. #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
"vvFq ,c #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
.>a$g7Rj #if _MSC_VER > 1000
i|[S5QXCh #pragma once
/.f! #endif // _MSC_VER > 1000
Q,O]x# #ifndef __AFXWIN_H__
<6gU2@1 #error include 'stdafx.h' before including this file for PCH
M`q#,Y?3^I #endif
J~:kuf21 #include "resource.h" // main symbols
uJ7,rq class CHookApp : public CWinApp
:nTkg[49pJ {
ud!r*E public:
C=M? CHookApp();
&8.z$}m // Overrides
l!Nvn$hm // ClassWizard generated virtual function overrides
Psg +\ 14 //{{AFX_VIRTUAL(CHookApp)
N/`g?B[ public:
o(BYT9|.kw virtual BOOL InitInstance();
p$&_fzb virtual int ExitInstance();
~91uk3ST? //}}AFX_VIRTUAL
;9
R40qi //{{AFX_MSG(CHookApp)
Rf&^th}TH // NOTE - the ClassWizard will add and remove member functions here.
>E{#HPpBi // DO NOT EDIT what you see in these blocks of generated code !
N n:m+ZDo^ //}}AFX_MSG
mT}Aje-L DECLARE_MESSAGE_MAP()
Pm'.,?" };
sCuQB Z h LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
a'c9XG} BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
\"{/yjO|4 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
H74NU_ BOOL InitHotkey();
N7%=K9 BOOL UnInit();
d8 3+6d #endif
48W:4B'l9 _zAc 5rS //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Uia)5z z8 #include "stdafx.h"
>f3k3XWRT #include "hook.h"
-{.h\ #include <windowsx.h>
REeD?u j #ifdef _DEBUG
^?JEyY #define new DEBUG_NEW
%Td+J`|U+ #undef THIS_FILE
oo"JMD) static char THIS_FILE[] = __FILE__;
us(sZG #endif
u~j'NOv #define MAX_KEY 100
H7 o$O #define CTRLBIT 0x04
`=WzG" #define ALTBIT 0x02
IiQWs1 #define SHIFTBIT 0x01
Yf%[6Y{ #pragma data_seg("shareddata")
2-/YYe;C HHOOK hHook =NULL;
5LnB]dW UINT nHookCount =0;
Qq6%53 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
a2IV!0x static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
t(Cq(.u`: static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
\v B9fA:* static int KeyCount =0;
\["1N-q b static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
fte!Ll' #pragma data_seg()
3RG/X HINSTANCE hins;
jnx+wcd void VerifyWindow();
;L MEU_ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
6+5(.z-[ //{{AFX_MSG_MAP(CHookApp)
.T[!!z#^ // NOTE - the ClassWizard will add and remove mapping macros here.
u&Ie%@:h9R // DO NOT EDIT what you see in these blocks of generated code!
Xb8:*Y1' //}}AFX_MSG_MAP
Q|zE@nLS
END_MESSAGE_MAP()
}6b7a1p 5[0l08'D CHookApp::CHookApp()
`3H?*\<( {
KG7X8AaK# // TODO: add construction code here,
`RL(N4H // Place all significant initialization in InitInstance
_r^G%Mvy| }
]ys4 GNj/jU<o! CHookApp theApp;
'ocwXyP, LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
,L8I7O}A; {
=[O<.'aG- BOOL bProcessed=FALSE;
FeincZ!M if(HC_ACTION==nCode)
>(YPkmH {
~Y}Z4" o if((lParam&0xc0000000)==0xc0000000){// Key up
mw%[qeLV switch(wParam)
fM
zAf3 {
P,LXZ case VK_MENU:
I NFzX MaskBits&=~ALTBIT;
V9);kD break;
"J0Oa? case VK_CONTROL:
B_6v'=7] MaskBits&=~CTRLBIT;
kKI!B`j=
break;
6='_+{
case VK_SHIFT:
tleK(^ MaskBits&=~SHIFTBIT;
N:sECGS, break;
Z"PDOwj5 default: //judge the key and send message
|M0,%~Kt break;
h)aWerzL }
OQX{<pQ6 for(int index=0;index<MAX_KEY;index++){
9#.NPfMF if(hCallWnd[index]==NULL)
eo}S01bt continue;
^me}k{x if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
b{ubp {
S|Ij q3 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
NUO,"Bqq bProcessed=TRUE;
2TevdyI }
Cvu8X&y }
U3dR[* }
^FyvaO else if((lParam&0xc000ffff)==1){ //Key down
%i
JU)N! switch(wParam)
[b\lcQ8O {
hr
6LB&d_ case VK_MENU:
_|Kv~\G! MaskBits|=ALTBIT;
vVvt
]h break;
|]
f"j': case VK_CONTROL:
JJZXSBAOU MaskBits|=CTRLBIT;
;zxlwdfcr' break;
E.G h@i case VK_SHIFT:
eG2qOq$[ MaskBits|=SHIFTBIT;
>8{`q!=|~ break;
XiZ Zo default: //judge the key and send message
2+G:04eS,e break;
D;#Yn M3 }
R'a5,zEo/ for(int index=0;index<MAX_KEY;index++)
F.* snF {
;V}FbWz^v6 if(hCallWnd[index]==NULL)
IbNTdg]/F` continue;
Ar{=gENn if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
vNwSZ{JBd {
;@ ! d!& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
/VjbyRwV bProcessed=TRUE;
\gk3w,B?E }
)v$Cv|" }
@|*Z0bn' }
e7j]BzGvl if(!bProcessed){
L)//-
k9 for(int index=0;index<MAX_KEY;index++){
>+c`GpZH if(hCallWnd[index]==NULL)
"x) pp continue;
,Elga}7u if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
\~1zAiSd># SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
KLv }
3B_} : }
4Hd@U&E }
2|_Jup return CallNextHookEx( hHook, nCode, wParam, lParam );
T`2fPxM:cZ }
PXQ9P<m &Bdt+OQ ; BOOL InitHotkey()
<raqp Oo& {
y<LwrrJ> if(hHook!=NULL){
bz,cfc;?$ nHookCount++;
}_D5, k return TRUE;
Iy 8E$B; }
)PZ}^Fa else
0 VgnN hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
jKi*3-& if(hHook!=NULL)
T4, Zc nHookCount++;
.$x[!fuuR& return (hHook!=NULL);
<OO/Tn'a }
oG_'<5Bv> BOOL UnInit()
}4ghT(C}$ {
qYrGe if(nHookCount>1){
$T%<'=u|E nHookCount--;
zSM7x return TRUE;
;<GTtt#D }
_"t.1+-K BOOL unhooked = UnhookWindowsHookEx(hHook);
a0j.\g if(unhooked==TRUE){
dfkTDG+ nHookCount=0;
#dm@%~B{. hHook=NULL;
b2@x(5# }
e~~k}2~ return unhooked;
F vk:c- }
X}QmeY[0I <rI$"=7 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
%T*+t"\) {
pvdZ>D-IU BOOL bAdded=FALSE;
(uxQBy for(int index=0;index<MAX_KEY;index++){
=y(YMWGS if(hCallWnd[index]==0){
!'t2 hCallWnd[index]=hWnd;
<"Cwy0V kp HotKey[index]=cKey;
i&G`ah> HotKeyMask[index]=cMask;
EG8R*Cm,} bAdded=TRUE;
GSb)|mj KeyCount++;
=FJ9wiL break;
s6hWq&C }
e.YchGTQ }
!?M_%fNE return bAdded;
*R6eykp }
X@4d~6k? F`}w0=-*( BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
uU!i`8 {
:
MmXH&yR BOOL bRemoved=FALSE;
A;nmua-Fv for(int index=0;index<MAX_KEY;index++){
=5_F9nk- if(hCallWnd[index]==hWnd){
P FFw$\j if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
l6U' hCallWnd[index]=NULL;
T S8E9#1a HotKey[index]=0;
(_5+`YsV HotKeyMask[index]=0;
!3v"7l{LF bRemoved=TRUE;
snNg:rTL KeyCount--;
4<>:] break;
'>3RZ&O }
zLK
~i>aW }
~\IDg/9Cj }
aC]l({-0 return bRemoved;
")gCA:1- }
$^aXVy5p 3Qr!?=nf void VerifyWindow()
&rWJg6/ {
EUS]Se2 for(int i=0;i<MAX_KEY;i++){
Y9ce"*b if(hCallWnd
!=NULL){ sO-R+G/^7
if(!IsWindow(hCallWnd)){ 3n)iTSU3
hCallWnd=NULL; E1v<-UPbA
HotKey=0; =w?cp}HW
HotKeyMask=0; g]Ny?61
KeyCount--; 3VBV_/i;
} )_.H #|r
} O5*uL{pvT{
} =YsTF T
} 7B2Og{P
iDxgAV f*
BOOL CHookApp::InitInstance() .7rsbZzs
{ GV[BpH
AFX_MANAGE_STATE(AfxGetStaticModuleState()); s'=]a-l~
hins=AfxGetInstanceHandle(); .Vjpkt:H
InitHotkey(); gbZ X'D
return CWinApp::InitInstance(); M8Lj*JN
} r+Cha%&D
CfnCi_=[ `
int CHookApp::ExitInstance() ne*aC_)bT
{ O5%F-}(:
VerifyWindow(); PS]XLz
UnInit(); X0=-{<W
return CWinApp::ExitInstance(); XArLL5_L
} G ~\$Oq8
bFXCaD!{G
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 41D[[Gh
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) nu-wQr
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ HJrg
#if _MSC_VER > 1000 Om{ML,d
#pragma once CI{TgL:l
#endif // _MSC_VER > 1000 <7Lz<{jaJ
b#^D8_9h
class CCaptureDlg : public CDialog `<Nc
Y*
{ x;aZ&
// Construction 3Ab$
public: J>v>6OC6i
BOOL bTray; 1'B?f# s
BOOL bRegistered; 4"=pcHNV
BOOL RegisterHotkey(); I2Q?7p
UCHAR cKey; zwHsdB=v
UCHAR cMask; g8yZc}4
void DeleteIcon(); \MPy"uC
void AddIcon(); KJSy7F
UINT nCount; IrM3Uh
void SaveBmp(); kS!*kk*a
CCaptureDlg(CWnd* pParent = NULL); // standard constructor QKQy)g
// Dialog Data 5%/%i}e~(
//{{AFX_DATA(CCaptureDlg) 2ARh-zLb
enum { IDD = IDD_CAPTURE_DIALOG }; 3Mt6iZW
CComboBox m_Key; 4B(qVf&M
BOOL m_bControl; t|_g O!w8
BOOL m_bAlt; q[g^[~WM#
BOOL m_bShift; Iqv
5lo
.
CString m_Path; A;PV,2|X
CString m_Number; _JoA=<O!
//}}AFX_DATA Yuck]?#0
// ClassWizard generated virtual function overrides 7T78S&g
//{{AFX_VIRTUAL(CCaptureDlg) ^ 2tCDm5
public: ]~,'[gWb
virtual BOOL PreTranslateMessage(MSG* pMsg); ;[ojwcK[ZF
protected: d1TG[i<J_
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (Zkt2[E`
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Yr@ @ty
//}}AFX_VIRTUAL }wKU=Vm
// Implementation g5`YUr+3?h
protected: WOoVVjMM
HICON m_hIcon; #,C{?0!
// Generated message map functions 0KEl+
//{{AFX_MSG(CCaptureDlg) fN;y\!q5
virtual BOOL OnInitDialog(); u]-$]zIH
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); \!Pm^FD
.
afx_msg void OnPaint(); yR-.OF,c
afx_msg HCURSOR OnQueryDragIcon(); I(|{/{P,
virtual void OnCancel(); (>'d`^kjk
afx_msg void OnAbout(); VPzdT*g]
afx_msg void OnBrowse(); ZgtOy|?|
afx_msg void OnChange(); wu3ZSLY
//}}AFX_MSG >d|W>|8e
DECLARE_MESSAGE_MAP() K+H82$
#
}; Rlu;l
#endif s RB8 jY
E O^0sF<
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file kS>j!U(%d
#include "stdafx.h" Z~<V>b
#include "Capture.h" :mL.Y em*'
#include "CaptureDlg.h" i[swOYz]X
#include <windowsx.h> S]+}Zyg
#pragma comment(lib,"hook.lib") M_DkjuR
#ifdef _DEBUG q_)DY
f7V}
#define new DEBUG_NEW [a2/`ywdV
#undef THIS_FILE ?g2K&
static char THIS_FILE[] = __FILE__; +=v|kd
#endif 7UfyOOFa
#define IDM_SHELL WM_USER+1 v?J2cL
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l!2.)F` x
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); TDFv\y}yc
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; y!].l0e2a
class CAboutDlg : public CDialog 7}MWmS^8j
{ oUH\SW8?
public: 6$Y1[
CAboutDlg(); 9dAsXEWh
// Dialog Data mjpH)6aD0
//{{AFX_DATA(CAboutDlg) #v1 4"s Z}
enum { IDD = IDD_ABOUTBOX }; ,wjL3c
//}}AFX_DATA 1Y_fX
// ClassWizard generated virtual function overrides AkF3F^
//{{AFX_VIRTUAL(CAboutDlg) X9>ujgK
protected: Fc
Cxr@
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1RLSeT
//}}AFX_VIRTUAL 1JY4E2Q
// Implementation @%K 8oYK
protected: D UeT
//{{AFX_MSG(CAboutDlg) o3yZC z
//}}AFX_MSG ZsE8eD
DECLARE_MESSAGE_MAP() 7u; B[qH
}; #HML=qK~
(s*}=
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) QLn5:&
{ K4~dEZ
//{{AFX_DATA_INIT(CAboutDlg) Sq,x@
//}}AFX_DATA_INIT .%o:kq@B
} 6BMn7m?
am=56J$ig
void CAboutDlg::DoDataExchange(CDataExchange* pDX) DN+iS
{ /W;;7k
CDialog::DoDataExchange(pDX); ck;owGlT
//{{AFX_DATA_MAP(CAboutDlg) F+X3CB,f
//}}AFX_DATA_MAP QJ
QQ-
} a^N/N5-Z
5:6mptn>
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) QP'*
)gjO7
//{{AFX_MSG_MAP(CAboutDlg) (NP=5lLH
// No message handlers W'[!4RQL
//}}AFX_MSG_MAP VYO O8MQI
END_MESSAGE_MAP() x&sF_<[
({)_[dJ'
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) q
/#O :Q
: CDialog(CCaptureDlg::IDD, pParent) $O[ut.
{ (%bfNs|
//{{AFX_DATA_INIT(CCaptureDlg) w
^A0l.{
m_bControl = FALSE; M9M EQK
m_bAlt = FALSE; e.Ii@<
m_bShift = FALSE; ZyTah\yPM
m_Path = _T("c:\\"); IMBqy -q
m_Number = _T("0 picture captured."); RGcT
nCount=0; Qx:+n`$/
bRegistered=FALSE; j \SDw
bTray=FALSE; W[b/.u5z:
//}}AFX_DATA_INIT 2-
)Ml*
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 l{k
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 'lWNU
} nV'B!q
0GB6.Ggft
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) $*tuv?
{ %j'lWwi
CDialog::DoDataExchange(pDX); #ws6z`mt
//{{AFX_DATA_MAP(CCaptureDlg) pz(clTOD:
DDX_Control(pDX, IDC_KEY, m_Key); ?C_%"!GR
DDX_Check(pDX, IDC_CONTROL, m_bControl); 6rk/74gI,a
DDX_Check(pDX, IDC_ALT, m_bAlt); KxvT}"k
DDX_Check(pDX, IDC_SHIFT, m_bShift); CNzK-,
DDX_Text(pDX, IDC_PATH, m_Path); #SL/Jr
DZ
DDX_Text(pDX, IDC_NUMBER, m_Number); 9F3`hJZRy>
//}}AFX_DATA_MAP Cnc77EUD
} zX3O_
8ciLzyrY*
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) +ISB"a
//{{AFX_MSG_MAP(CCaptureDlg) "?]5"lNC|
ON_WM_SYSCOMMAND() 8s|r'
ON_WM_PAINT() a-7nA
ON_WM_QUERYDRAGICON()
^s%Qt
ON_BN_CLICKED(ID_ABOUT, OnAbout) S_^ "$j
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) "~GudK &
ON_BN_CLICKED(ID_CHANGE, OnChange) pt=[XhxC(>
//}}AFX_MSG_MAP H`fkds
END_MESSAGE_MAP() X,~8) W
4}gwMjU-B
BOOL CCaptureDlg::OnInitDialog() Odagaca
{ G G7N!eZ
CDialog::OnInitDialog(); seJc,2Ex
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <>-UPRwqI
ASSERT(IDM_ABOUTBOX < 0xF000); -i9/1.Z
CMenu* pSysMenu = GetSystemMenu(FALSE); bju0l[;=
if (pSysMenu != NULL) S6cSeRmw
{ ImgKqp0Z
CString strAboutMenu; (|Xf=q,Le
strAboutMenu.LoadString(IDS_ABOUTBOX); &%^[2^H8"
if (!strAboutMenu.IsEmpty()) z8A`BVqI
{ 6~^+</?
pSysMenu->AppendMenu(MF_SEPARATOR); 7%JXVP}A
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); W0R6<-
1
} $WdZAv\_S
} lVMAab
SetIcon(m_hIcon, TRUE); // Set big icon B} &C
h
SetIcon(m_hIcon, FALSE); // Set small icon h$lY,7
m_Key.SetCurSel(0); \2W( >_z
RegisterHotkey(); 7m8L!t9
CMenu* pMenu=GetSystemMenu(FALSE); d8|:)7PSt
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); wd u>3Ch"y
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); SJw0y[IL6(
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); vhT9#) HI
return TRUE; // return TRUE unless you set the focus to a control 4iDo.1B"
} _w)0r}{
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void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (RGl, x:
{ lnTl"9F
if ((nID & 0xFFF0) == IDM_ABOUTBOX) aFKks .n3
{ Il!iqDHz3
CAboutDlg dlgAbout; hd+JKh!u
dlgAbout.DoModal(); ^ 3Vjmv
} l46O=?usDX
else d@`yRueWiV
{ #~(@Ka.eA0
CDialog::OnSysCommand(nID, lParam); IDv@r\Xw
} ; <3w ,r
} |U12fuQ
!1|f,9C
void CCaptureDlg::OnPaint() 6?2/b`k
{ UGl}=hwKkG
if (IsIconic()) E|#'u^`yv
{ wtMS<$
CPaintDC dc(this); // device context for painting !! #\P7P
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 8iq~ha$]|
// Center icon in client rectangle jt?R
a1Z
int cxIcon = GetSystemMetrics(SM_CXICON); t'~:me!
int cyIcon = GetSystemMetrics(SM_CYICON); Z3 &8(vw
CRect rect; YAsvw\iseK
GetClientRect(&rect); )\p@E3Uxf
int x = (rect.Width() - cxIcon + 1) / 2;
T<P4+#JK
int y = (rect.Height() - cyIcon + 1) / 2; _)lK.5
// Draw the icon DAJh9I
dc.DrawIcon(x, y, m_hIcon); 'M YqCfIK
} _Tev503
else }K0.*+M
{ "x&H*"
CDialog::OnPaint(); ](^VEm}w;
} MwXgaSV
} yv,9 0+k
,X+071.(
HCURSOR CCaptureDlg::OnQueryDragIcon() c~@I1M
{ L[rJ7:
return (HCURSOR) m_hIcon; lkBab$S)
} O`H[,+vm[
350 y6pVh
void CCaptureDlg::OnCancel() DtyT8kr
{ h1J-AfV
if(bTray) .3oFSc`q
DeleteIcon(); LTG/gif[u
CDialog::OnCancel(); H~&9xtuHN
} BYP,}yzA
?^0#:QevC
void CCaptureDlg::OnAbout() WF_G GF{
{ 6$2)m;| XY
CAboutDlg dlg; p}N'>+@=
dlg.DoModal(); luAhyEp
} @~/LsYA:
1,BtOzuRo
void CCaptureDlg::OnBrowse() QZ%_hvY[%>
{ 5h1FvJg
CString str; o{m$b2BW
BROWSEINFO bi; 2i8'*L+j
char name[MAX_PATH]; XW`&1qx
ZeroMemory(&bi,sizeof(BROWSEINFO)); ^i#F+Q`1
bi.hwndOwner=GetSafeHwnd(); QfRt3\^`
bi.pszDisplayName=name; mLKwk6I
bi.lpszTitle="Select folder"; )";g*4R[
bi.ulFlags=BIF_RETURNONLYFSDIRS; ?\.P
LPITEMIDLIST idl=SHBrowseForFolder(&bi); \/lH]u\x
if(idl==NULL) v&p\r'w
return; $:F] O$A
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); *m2J$9q
str.ReleaseBuffer(); N!^U{;X7/
m_Path=str; Bglh}_X
if(str.GetAt(str.GetLength()-1)!='\\') RwN*/Li
m_Path+="\\"; bQEQHqY5
UpdateData(FALSE); 866n{lyL
} rn U2EL
MvJEX8M
void CCaptureDlg::SaveBmp() X2T)]`@
{ 5>"-lB &
CDC dc; f`P%aX'cBQ
dc.CreateDC("DISPLAY",NULL,NULL,NULL); DYbkw4Z,
CBitmap bm; &\`=}hB
int Width=GetSystemMetrics(SM_CXSCREEN); 0|HD(d`a
int Height=GetSystemMetrics(SM_CYSCREEN); qzsS"=5
bm.CreateCompatibleBitmap(&dc,Width,Height); pOpie5)7X
CDC tdc; v6TH-
tdc.CreateCompatibleDC(&dc); $ v$~.
CBitmap*pOld=tdc.SelectObject(&bm); E.4`aJ@>d
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Q_qc_IcM y
tdc.SelectObject(pOld); mp%i(Y"vp
BITMAP btm;
jats)!:
bm.GetBitmap(&btm); 9Jaek_A`
DWORD size=btm.bmWidthBytes*btm.bmHeight; X{<j%PdC
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); OV Iu&6#
BITMAPINFOHEADER bih; p7Gs
bih.biBitCount=btm.bmBitsPixel; 5(tOQ%AQ
bih.biClrImportant=0; IgQW 5E#
bih.biClrUsed=0; Z_cTuu0'
bih.biCompression=0; m?>$!B4jFB
bih.biHeight=btm.bmHeight; ES<"YF
bih.biPlanes=1; bY&s$Ry3"
bih.biSize=sizeof(BITMAPINFOHEADER); #*1\h=bzmW
bih.biSizeImage=size; i{
eDV
bih.biWidth=btm.bmWidth; dGTAZ(1W
bih.biXPelsPerMeter=0; 7[ *,t
bih.biYPelsPerMeter=0; \P+lb-~\"
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Hq< Vk.Nk
static int filecount=0; \HV%579
CString name; dEJ>8e8
name.Format("pict%04d.bmp",filecount++); %v4/.4sR,;
name=m_Path+name; G}AfCd4
BITMAPFILEHEADER bfh; ^+Ec}+ Q
bfh.bfReserved1=bfh.bfReserved2=0; r8}GiP0|
bfh.bfType=((WORD)('M'<< 8)|'B'); RWz^
MV5K
bfh.bfSize=54+size; *GTCVxu
bfh.bfOffBits=54; v.c2(w/P
CFile bf; tA Pqbi$a
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 0r.*7aXu
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); DU|0#z=*t5
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); A#f@0W:
bf.WriteHuge(lpData,size); Tr-gdX ;
bf.Close(); )1Z*kY?f!
nCount++; Z~9\7QJn
} |*e
>hk
GlobalFreePtr(lpData); OtrO"K
if(nCount==1) {xMY2I++
m_Number.Format("%d picture captured.",nCount); 1wi{lJaz
else W,}HQ
m_Number.Format("%d pictures captured.",nCount); =;i@,{
~
UpdateData(FALSE); CT6a
} P}KyT?X:
2~K.m@U}!Z
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) K9;pX2^z9
{ 8m2-fuJz
if(pMsg -> message == WM_KEYDOWN) =ugxPgn
{ #,0%g1
if(pMsg -> wParam == VK_ESCAPE) a)`b;]+9
return TRUE; 0' @^PzX
if(pMsg -> wParam == VK_RETURN) ~ubGx
return TRUE; )R<hYd
} gV91=Pj
return CDialog::PreTranslateMessage(pMsg); C;y3?+6P$
} O)kC[e4
~Q0gSazXFt
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) n [[rI0]g
{ )K4 |-<i
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ a.y_o50#T
SaveBmp(); S=n,unn#t
return FALSE; ?ye)&
} %S]H
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ZYos.ay
CMenu pop; "Rf8#\Y/<
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 2fu|X#R
CMenu*pMenu=pop.GetSubMenu(0); |nk&ir6
pMenu->SetDefaultItem(ID_EXITICON); W8'cAY
CPoint pt; qHt!)j9GKv
GetCursorPos(&pt); rLw,?
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); NU-({dGK}
if(id==ID_EXITICON) 9_n!.zA<
DeleteIcon(); i<YatW~Pu
else if(id==ID_EXIT) D ?1$I0 =
OnCancel(); cP''
return FALSE; L6fc_Mo.EE
} b?hdWQSW7
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 7q<I7Wt
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) QU2\gAM
AddIcon(); np}F [v
return res; Rf+ogLa=
} %`t;5kmR
}H&NR?Ax
void CCaptureDlg::AddIcon() TartV3;`
{ (`>RwooE
NOTIFYICONDATA data; hw:zak#j,
data.cbSize=sizeof(NOTIFYICONDATA); 559znM=
CString tip; -n?}L#4%8
tip.LoadString(IDS_ICONTIP); hu%UEB
data.hIcon=GetIcon(0);
n4h@{Xg
data.hWnd=GetSafeHwnd(); }xJ9EE*G/
strcpy(data.szTip,tip); \Azl6`Em
data.uCallbackMessage=IDM_SHELL; x00"d$!
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; AkrUb$ }
data.uID=98; yQ?N*'}$
Shell_NotifyIcon(NIM_ADD,&data); )q&=x2`
ShowWindow(SW_HIDE); s?@{
bTray=TRUE; HF"
v
\
} a;|C51GH
7SE\(K=<%
void CCaptureDlg::DeleteIcon() I83ZN]
{ #/Y t4n
NOTIFYICONDATA data; 8zP{Cmm
data.cbSize=sizeof(NOTIFYICONDATA); vz</|s
data.hWnd=GetSafeHwnd(); O4ciD1
data.uID=98; B @H.O!
Shell_NotifyIcon(NIM_DELETE,&data); , |CT|2D>
ShowWindow(SW_SHOW); rR@ t5
SetForegroundWindow(); ,F`:4=H%
ShowWindow(SW_SHOWNORMAL); D642}VD
bTray=FALSE; h@7Shp
} wXIsc;
zM%ILv4
void CCaptureDlg::OnChange() .?UK`O2Q
{ vE0Ty9OH"]
RegisterHotkey(); m=b~Wf39
} lG;RfDI-
*G7$wW:?
BOOL CCaptureDlg::RegisterHotkey() D *R F._
{ V'sp6:3*\
UpdateData(); ??5qR8n.
UCHAR mask=0; .9_]8T
UCHAR key=0; 3/+9#
if(m_bControl) QkBT,c
mask|=4; PdcF
if(m_bAlt) 9!zUv:;
mask|=2; 2siUpmX
if(m_bShift) Gnop
mask|=1; !:PF |dZ
key=Key_Table[m_Key.GetCurSel()]; FVNxjMm,
if(bRegistered){ R|
[mp%Q
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Y[k%<f
bRegistered=FALSE; 4vq,W_n.hQ
} vi')-1Y
KM
cMask=mask; w'oP{=y[
cKey=key; ) E.KB6
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); /~)vma1<
return bRegistered; rs2G{a
} +e+hIMur
u POmiF
四、小结 XP~bmh,T,
&@u;xc| v
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。