查找CAD顏色索引對應RGB數據，建立對應數據表。需要將顏色索引轉換爲RGB格式時，查表即可。以下爲解決此問題建立的數據表:
typedef struct _RGBC{
int Index; // AutoCAD color index
int R; // Color Read
int G; // Color Green
int B; // Color Blue
}RGBC;
RGBC RGBTab[] = {
{ 1,255, 0, 0}, { 2,255,255, 0}, { 3, 0,255, 0}, { 4, 0,255,255}, { 5, 0, 0,255},
{ 6,255, 0,255}, { 7,255,255,255}, { 8,128,128,128}, { 9,192,192,192}, { 10,255, 0, 0},
{ 11,255,127,127}, { 12,204, 0, 0}, { 13,204,102,102}, { 14,153, 0, 0}, { 15,153, 76, 76},
{ 16,127, 0, 0}, { 17,127, 63, 63}, { 18, 76, 0, 0}, { 19, 76, 38, 38}, { 20,255, 63, 0},
{ 21,255,159,127}, { 22,204, 51, 0}, { 23,204,127,102}, { 24,153, 38, 0}, { 25,153, 95, 76},
{ 26,127, 31, 0}, { 27,127, 79, 63}, { 28, 76, 19, 0}, { 29, 76, 47, 38}, { 30,255,127, 0},
{ 31,255,191,127}, { 32,204,102, 0}, { 33,204,153,102}, { 34,153, 76, 0}, { 35,153,114, 76},
{ 36,127, 63, 0}, { 37,127, 95, 63}, { 38, 76, 38, 0}, { 39, 76, 57, 38}, { 40,255,191, 0},
{ 41,255,223,127}, { 42,204,153, 0}, { 43,204,178,102}, { 44,153,114, 0}, { 45,153,133, 76},
{ 46,127, 95, 0}, { 47,127,111, 63}, { 48, 76, 57, 0}, { 49, 76, 66, 38}, { 50,255,255, 0},
{ 51,255,255,127}, { 52,204,204, 0}, { 53,204,204,102}, { 54,153,153, 0}, { 55,153,153, 76},
{ 56,127,127, 0}, { 57,127,127, 63}, { 58, 76, 76, 0}, { 59, 76, 76, 38}, { 60,191,255, 0},
{ 61,223,255,127}, { 62,153,204, 0}, { 63,178,204,102}, { 64,114,153, 0}, { 65,133,153, 76},
{ 66, 95,127, 0}, { 67,111,127, 63}, { 68, 57, 76, 0}, { 69, 66, 76, 38}, { 70,127,255, 0},
{ 71,191,255,127}, { 72,102,204, 0}, { 73,153,204,102}, { 74, 76,153, 0}, { 75,114,153, 76},
{ 76, 63,127, 0}, { 77, 95,127, 63}, { 78, 38, 76, 0}, { 79, 57, 76, 38}, { 80, 63,255, 0},
{ 81,159,255,127}, { 82, 51,204, 0}, { 83,127,204,102}, { 84, 38,153, 0}, { 85, 95,153, 76},
{ 86, 31,127, 0}, { 87, 79,127, 63}, { 88, 19, 76, 0}, { 89, 47, 76, 38}, { 90, 0,255, 0},
{ 91,127,255,127}, { 92, 0,204, 0}, { 93,102,204,102}, { 94, 0,153, 0}, { 95, 76,153, 76},
{ 96, 0,127, 0}, { 97, 63,127, 63}, { 98, 0, 76, 0}, { 99, 38, 76, 38}, {100, 0,255, 63},
{101,127,255,159}, {102, 0,204, 51}, {103,102,204,127}, {104, 0,153, 38}, {105, 76,153, 95},
{106, 0,127, 31}, {107, 63,127, 79}, {108, 0, 76, 19}, {109, 38, 76, 47}, {110, 0,255,127},
{111,127,255,191}, {112, 0,204,102}, {113,102,204,153}, {114, 0,153, 76}, {115, 76,153,114},
{116, 0,127, 63}, {117, 63,127, 95}, {118, 0, 76, 38}, {119, 38, 76, 57}, {120, 0,255,191},
{121,127,255,223}, {122, 0,204,153}, {123,102,204,178}, {124, 0,153,114}, {125, 76,153,133},
{126, 0,127, 95}, {127, 63,127,111}, {128, 0, 76, 57}, {129, 38, 76, 66}, {130, 0,255,255},
{131,127,255,255}, {132, 0,204,204}, {133,102,204,204}, {134, 0,153,153}, {135, 76,153,153},
{136, 0,127,127}, {137, 63,127,127}, {138, 0, 76, 76}, {139, 38, 76, 76}, {140, 0,191,255},
{141,127,223,255}, {142, 0,153,204}, {143,102,178,204}, {144, 0,114,153}, {145, 76,133,153},
{146, 0, 95,127}, {147, 63,111,127}, {148, 0, 57, 76}, {149, 38, 66, 76}, {150, 0,127,255},
{151,127,191,255}, {152, 0,102,204}, {153,102,153,204}, {154, 0, 76,153}, {155, 76,114,153},
{156, 0, 63,127}, {157, 63, 95,127}, {158, 0, 38, 76}, {159, 38, 57, 76}, {160, 0, 63,255},
{161,127,159,255}, {162, 0, 51,204}, {163,102,127,204}, {164, 0, 38,153}, {165, 76, 95,153},
{166, 0, 31,127}, {167, 63, 79,127}, {168, 0, 19, 76}, {169, 38, 47, 76}, {170, 0, 0,255},
{171,127,127,255}, {172, 0, 0,204}, {173,102,102,204}, {174, 0, 0,153}, {175, 76, 76,153},
{176, 0, 0,127}, {177, 63, 63,127}, {178, 0, 0, 76}, {179, 38, 38, 76}, {180, 63, 0,255},
{181,159,127,255}, {182, 51, 0,204}, {183,127,102,204}, {184, 38, 0,153}, {185, 95, 76,153},
{186, 31, 0,127}, {187, 79, 63,127}, {188, 19, 0, 76}, {189, 47, 38, 76}, {190,127, 0,255},
{191,191,127,255}, {192,102, 0,204}, {193,153,102,204}, {194, 76, 0,153}, {195,114, 76,153},
{196, 63, 0,127}, {197, 95, 63,127}, {198, 38, 0, 76}, {199, 57, 38, 76}, {200,191, 0,255},
{201,223,127,255}, {202,153, 0,204}, {203,178,102,204}, {204,114, 0,153}, {205,133, 76,153},
{206, 95, 0,127}, {207,111, 63,127}, {208, 57, 0, 76}, {209, 66, 38, 76}, {210,255, 0,255},
{211,255,127,255}, {212,204, 0,204}, {213,204,102,204}, {214,153, 0,153}, {215,153, 76,153},
{216,127, 0,127}, {217,127, 63,127}, {218, 76, 0, 76}, {219, 76, 38, 76}, {220,255, 0,191},
{221,255,127,223}, {222,204, 0,153}, {223,204,102,178}, {224,153, 0,114}, {225,153, 76,133},
{226,127, 0, 95}, {227,127, 63,111}, {228, 76, 0, 57}, {229, 76, 38, 66}, {230,255, 0,127},
{231,255,127,191}, {232,204, 0,102}, {233,204,102,153}, {234,153, 0, 76}, {235,153, 76,114},
{236,127, 0, 63}, {237,127, 63, 95}, {238, 76, 0, 38}, {239, 76, 38, 57}, {240,255, 0, 63},
{241,255,127,159}, {242,204, 0, 51}, {243,204,102,127}, {244,153, 0, 38}, {245,153, 76, 95},
{246,127, 0, 31}, {247,127, 63, 79}, {248, 76, 0, 19}, {249, 76, 38, 47}, {250, 51, 51, 51},
{251, 91, 91, 91}, {252,132,132,132}, {253,173,173,173}, {254,214,214,214}, {255,255,255,255}
};
本問題解決參考：https://blog.csdn.net/zyrr159487/article/details/7012266?utm_source=blogxgwz0
感謝博主提供的資料！