Wednesday, 25 January 2017
c++ - Error LNK2019 unresolved external symbol _main referenced in function "int __cdecl invoke_main(void)" (?invoke_main@@YAHXZ)
Answer
Severity Code Description Project File Line Error LNK2019 unresolved external symbol _main referenced in function "int __cdecl invoke_main(void)" (?invoke_main@@YAHXZ)
Severity Code Description Project File Line
Error LNK1120 1 unresolved externals
#include "windows.h"
#include "tchar.h"
#include "d3d9.h"
#pragma comment(lib, "d3d9.lib")
LPDIRECT3D9 pDirect3D=NULL;
LPDIRECT3DDEVICE9 pDirect3DDevice=NULL;
const int segment = 50;
const int NV = segment*13;
struct CUSTOMVERTEX
{
float x, y, z, rhv;
DWORD color;
};
#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZRHW|D3DFVF_DIFFUSE)
LPDIRECT3DVERTEXBUFFER9 pVertexBuffer=NULL;
HRESULT InitialDirect3D(HWND hvnd)
{
if((pDirect3D=Direct3DCreate9(D3D_SDK_VERSION))==NULL)
return E_FAIL;
D3DDISPLAYMODE Display;
if(FAILED(pDirect3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &Display)))
return E_FAIL;
D3DPRESENT_PARAMETERS Direct3DParameter;
ZeroMemory(&Direct3DParameter, sizeof Direct3DParameter);
Direct3DParameter.Windowed=TRUE;
Direct3DParameter.SwapEffect=D3DSWAPEFFECT_DISCARD;
Direct3DParameter.BackBufferFormat=Display.Format;
if(FAILED(pDirect3D->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hvnd,
D3DCREATE_HARDWARE_VERTEXPROCESSING,
&Direct3DParameter, &pDirect3DDevice)))
return E_FAIL;
return S_OK;
}
HRESULT RenderingDirect3D()
{
if(pDirect3DDevice==NULL)
return E_FAIL;
pDirect3DDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(90, 150, 100), 1.f, 0);
pDirect3DDevice->BeginScene();
pDirect3DDevice->SetStreamSource(0, pVertexBuffer, 0, sizeof(CUSTOMVERTEX));
pDirect3DDevice->SetFVF(D3DFVF_CUSTOMVERTEX);
pDirect3DDevice->DrawPrimitive(D3DPT_LINELIST, 0, NV);
pDirect3DDevice->EndScene();
pDirect3DDevice->Present(NULL, NULL, NULL, NULL);
return S_OK;
}
void DeleteDirect3D()
{
if(pVertexBuffer)
pVertexBuffer->Release();
if(pDirect3DDevice)
pDirect3DDevice->Release();
if(pDirect3D)
pDirect3D->Release();
}
HRESULT InitialVertexBuffer()
{
float u = 0.0;
int z = 0;
float points[][2] = {
{150,150},
{125,100},
{150,50},
{200,50},
{225,55},
{285,60},
{325,25},
{342,30},
{340,35},
{340,40},
{325,75},
{300,125},
{300,175},
{305,250},
{295,287},
{257,347},
{200,350},
{150,325},
{140,290},
{142,282},
{160,280},
{165,286},
{175,325},
{215,340},
{250,335},
{275,300},
{275,250},
{255,200},
{250,150},
{275,100},
{305,65},
{275,85},
{240,95},
{215,85},
{170,65},
{140,90},
{160,135},
{160,150},
{152.5,150},
{150,150}
};
CUSTOMVERTEX Vertexes[NV*2];
int i = 0;
while( i < NV*2 )
{
u = 0.f;
for(int j = 0; j < segment; j++)
{
Vertexes[i].x = (1-3*u+3*u*u-u*u*u)*points[z][0]+(3*u-6*u*u+3*u*u*u)*points[z+1][0]+(3*u*u-3*u*u*u)*points[z+2][0]+(u*u*u)*points[z+3][0];
Vertexes[i].y = (1-3*u+3*u*u-u*u*u)*points[z][1]+(3*u-6*u*u+3*u*u*u)*points[z+1][1]+(3*u*u-3*u*u*u)*points[z+2][1]+(u*u*u)*points[z+3][1];
Vertexes[i].z = 0.5f;
Vertexes[i].color = 0x00ffffff;
Vertexes[i].rhv = 1.f;
u += (float)1/segment;
i++;
Vertexes[i].x = (1-3*u+3*u*u-u*u*u)*points[z][0]+(3*u-6*u*u+3*u*u*u)*points[z+1][0]+(3*u*u-3*u*u*u)*points[z+2][0]+(u*u*u)*points[z+3][0];
Vertexes[i].y = (1-3*u+3*u*u-u*u*u)*points[z][1]+(3*u-6*u*u+3*u*u*u)*points[z+1][1]+(3*u*u-3*u*u*u)*points[z+2][1]+(u*u*u)*points[z+3][1];
Vertexes[i].z = 0.5f;
Vertexes[i].color = 0x00ffffff;
Vertexes[i].rhv = 1.f;
i++;
}
z += 3;
}
if(FAILED(pDirect3DDevice->CreateVertexBuffer(NV*2*sizeof(CUSTOMVERTEX), 0, D3DFVF_CUSTOMVERTEX,
D3DPOOL_DEFAULT, &pVertexBuffer, NULL)))
return E_FAIL;
void *pVB=NULL;
if(FAILED(pVertexBuffer->Lock(0, sizeof Vertexes, (void**)&pVB, 0)))
return E_FAIL;
memcpy(pVB, Vertexes, sizeof Vertexes);
pVertexBuffer->Unlock();
return S_OK;
}
LRESULT CALLBACK MainWinProc(HWND hwnd,
UINT msg,
WPARAM wparam,
LPARAM lparam)
{
switch(msg)
{
//
case WM_PAINT:
RenderingDirect3D();
ValidateRect(hwnd, NULL);
break;
case WM_DESTROY:
DeleteDirect3D();
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, msg, wparam, lparam);
}
int WINAPI WinMain(HINSTANCE hinstance,
HINSTANCE hprevinstance,
LPSTR lpcmdline,
int ncmdshow)
{
WNDCLASSEX windowsclass;
HWND hwnd;
MSG msg;
//
windowsclass.cbSize=sizeof(WNDCLASSEX);
windowsclass.style=CS_DBLCLKS|CS_OWNDC|CS_HREDRAW|CS_VREDRAW;
windowsclass.lpfnWndProc=MainWinProc;
windowsclass.cbClsExtra=0;
windowsclass.cbWndExtra=0;
windowsclass.hInstance=hinstance;
windowsclass.hIcon=LoadIcon(NULL, IDI_APPLICATION);
windowsclass.hCursor=LoadCursor(NULL, IDC_ARROW);
windowsclass.hbrBackground=(HBRUSH)GetStockObject(GRAY_BRUSH);
windowsclass.lpszMenuName=NULL;
windowsclass.lpszClassName=_T("WINDOWSCLASS");
windowsclass.hIconSm=LoadIcon(NULL, IDI_APPLICATION);
if(!RegisterClassEx(&windowsclass))
return 0;
if(!(hwnd=CreateWindowEx(
NULL,
_T("WINDOWSCLASS"),
_T("Desenam litera G"),
WS_OVERLAPPEDWINDOW|WS_VISIBLE,
CW_USEDEFAULT, 0,
CW_USEDEFAULT, 0,
NULL,
NULL,
hinstance,
NULL)))
return 0;
if(SUCCEEDED(InitialDirect3D(hwnd)))
{
if(SUCCEEDED(InitialVertexBuffer()))
{
ShowWindow(hwnd, SW_SHOWDEFAULT);
UpdateWindow(hwnd);
ZeroMemory(&msg, sizeof msg);
while(msg.message!=WM_QUIT)
{
if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
else
RenderingDirect3D();
}
}
}
return msg.wParam;
}
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